Code

foreach_ref: make ref argument const
[tig.git] / tig.c
diff --git a/tig.c b/tig.c
index 6e5b0b4b9e131db046d322deacefada5079bb5b4..bd30997c00ede3035271484f5cb18326fe64c34c 100644 (file)
--- a/tig.c
+++ b/tig.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2006-2008 Jonas Fonseca <fonseca@diku.dk>
+/* Copyright (c) 2006-2009 Jonas Fonseca <fonseca@diku.dk>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
+#include <sys/wait.h>
 #include <sys/stat.h>
+#include <sys/select.h>
 #include <unistd.h>
+#include <sys/time.h>
 #include <time.h>
+#include <fcntl.h>
 
 #include <regex.h>
 
 static void __NORETURN die(const char *err, ...);
 static void warn(const char *msg, ...);
 static void report(const char *msg, ...);
-static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, size_t, char *, size_t));
 static void set_nonblocking_input(bool loading);
-static size_t utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool reserve);
-static bool prompt_yesno(const char *prompt);
-static int load_refs(void);
+static size_t utf8_length(const char **string, size_t col, int *width, size_t max_width, int *trimmed, bool reserve);
 
 #define ABS(x)         ((x) >= 0  ? (x) : -(x))
 #define MIN(x, y)      ((x) < (y) ? (x) :  (y))
+#define MAX(x, y)      ((x) > (y) ? (x) :  (y))
 
 #define ARRAY_SIZE(x)  (sizeof(x) / sizeof(x[0]))
 #define STRING_SIZE(x) (sizeof(x) - 1)
@@ -102,93 +104,90 @@ static int load_refs(void);
 /* The format and size of the date column in the main view. */
 #define DATE_FORMAT    "%Y-%m-%d %H:%M"
 #define DATE_COLS      STRING_SIZE("2006-04-29 14:21 ")
+#define DATE_SHORT_COLS        STRING_SIZE("2006-04-29 ")
 
-#define AUTHOR_COLS    20
 #define ID_COLS                8
 
-/* The default interval between line numbers. */
-#define NUMBER_INTERVAL        5
-
-#define TAB_SIZE       8
-
-#define        SCALE_SPLIT_VIEW(height)        ((height) * 2 / 3)
+#define MIN_VIEW_HEIGHT 4
 
 #define NULL_ID                "0000000000000000000000000000000000000000"
 
-#ifndef GIT_CONFIG
-#define GIT_CONFIG "config"
-#endif
-
-#define TIG_LS_REMOTE \
-       "git ls-remote . 2>/dev/null"
-
-#define TIG_DIFF_CMD \
-       "git show --pretty=fuller --no-color --root --patch-with-stat --find-copies-harder -C %s 2>/dev/null"
-
-#define TIG_LOG_CMD    \
-       "git log --no-color --cc --stat -n100 %s 2>/dev/null"
+#define S_ISGITLINK(mode) (((mode) & S_IFMT) == 0160000)
 
-#define TIG_MAIN_BASE \
-       "git log --no-color --pretty=raw --parents --topo-order"
-
-#define TIG_MAIN_CMD \
-       TIG_MAIN_BASE " %s 2>/dev/null"
-
-#define TIG_TREE_CMD   \
-       "git ls-tree %s %s"
-
-#define TIG_BLOB_CMD   \
-       "git cat-file blob %s"
-
-/* XXX: Needs to be defined to the empty string. */
-#define TIG_HELP_CMD   ""
-#define TIG_PAGER_CMD  ""
-#define TIG_STATUS_CMD ""
-#define TIG_STAGE_CMD  ""
-#define TIG_BLAME_CMD  ""
-
-/* Some ascii-shorthands fitted into the ncurses namespace. */
+/* Some ASCII-shorthands fitted into the ncurses namespace. */
 #define KEY_TAB                '\t'
 #define KEY_RETURN     '\r'
 #define KEY_ESC                27
 
 
 struct ref {
-       char *name;             /* Ref name; tag or head names are shortened. */
        char id[SIZEOF_REV];    /* Commit SHA1 ID */
        unsigned int head:1;    /* Is it the current HEAD? */
        unsigned int tag:1;     /* Is it a tag? */
        unsigned int ltag:1;    /* If so, is the tag local? */
        unsigned int remote:1;  /* Is it a remote ref? */
        unsigned int tracked:1; /* Is it the remote for the current HEAD? */
-       unsigned int next:1;    /* For ref lists: are there more refs? */
+       char name[1];           /* Ref name; tag or head names are shortened. */
 };
 
-static struct ref **get_refs(const char *id);
+struct ref_list {
+       char id[SIZEOF_REV];    /* Commit SHA1 ID */
+       size_t size;            /* Number of refs. */
+       struct ref **refs;      /* References for this ID. */
+};
 
-struct int_map {
-       const char *name;
-       int namelen;
-       int value;
+static struct ref_list *get_ref_list(const char *id);
+static void foreach_ref(bool (*visitor)(void *data, const struct ref *ref), void *data);
+static int load_refs(void);
+
+enum format_flags {
+       FORMAT_ALL,             /* Perform replacement in all arguments. */
+       FORMAT_DASH,            /* Perform replacement up until "--". */
+       FORMAT_NONE             /* No replacement should be performed. */
 };
 
-static int
-set_from_int_map(struct int_map *map, size_t map_size,
-                int *value, const char *name, int namelen)
-{
+static bool format_argv(const char *dst[], const char *src[], enum format_flags flags);
 
-       int i;
+enum input_status {
+       INPUT_OK,
+       INPUT_SKIP,
+       INPUT_STOP,
+       INPUT_CANCEL
+};
 
-       for (i = 0; i < map_size; i++)
-               if (namelen == map[i].namelen &&
-                   !strncasecmp(name, map[i].name, namelen)) {
-                       *value = map[i].value;
-                       return OK;
-               }
+typedef enum input_status (*input_handler)(void *data, char *buf, int c);
 
-       return ERR;
-}
+static char *prompt_input(const char *prompt, input_handler handler, void *data);
+static bool prompt_yesno(const char *prompt);
+
+struct menu_item {
+       int hotkey;
+       const char *text;
+       void *data;
+};
 
+static bool prompt_menu(const char *prompt, const struct menu_item *items, int *selected);
+
+/*
+ * Allocation helpers ... Entering macro hell to never be seen again.
+ */
+
+#define DEFINE_ALLOCATOR(name, type, chunk_size)                               \
+static type *                                                                  \
+name(type **mem, size_t size, size_t increase)                                 \
+{                                                                              \
+       size_t num_chunks = (size + chunk_size - 1) / chunk_size;               \
+       size_t num_chunks_new = (size + increase + chunk_size - 1) / chunk_size;\
+       type *tmp = *mem;                                                       \
+                                                                               \
+       if (mem == NULL || num_chunks != num_chunks_new) {                      \
+               tmp = realloc(tmp, num_chunks_new * chunk_size * sizeof(type)); \
+               if (tmp)                                                        \
+                       *mem = tmp;                                             \
+       }                                                                       \
+                                                                               \
+       return tmp;                                                             \
+}
 
 /*
  * String helpers
@@ -218,6 +217,27 @@ string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
 #define string_add(dst, from, src) \
        string_ncopy_do(dst + (from), sizeof(dst) - (from), src, sizeof(src))
 
+static void
+string_expand(char *dst, size_t dstlen, const char *src, int tabsize)
+{
+       size_t size, pos;
+
+       for (size = pos = 0; size < dstlen - 1 && src[pos]; pos++) {
+               if (src[pos] == '\t') {
+                       size_t expanded = tabsize - (size % tabsize);
+
+                       if (expanded + size >= dstlen - 1)
+                               expanded = dstlen - size - 1;
+                       memcpy(dst + size, "        ", expanded);
+                       size += expanded;
+               } else {
+                       dst[size++] = src[pos];
+               }
+       }
+
+       dst[size] = 0;
+}
+
 static char *
 chomp_string(char *name)
 {
@@ -277,6 +297,33 @@ string_enum_compare(const char *str1, const char *str2, int len)
        return 0;
 }
 
+struct enum_map {
+       const char *name;
+       int namelen;
+       int value;
+};
+
+#define ENUM_MAP(name, value) { name, STRING_SIZE(name), value }
+
+static bool
+map_enum_do(const struct enum_map *map, size_t map_size, int *value, const char *name)
+{
+       size_t namelen = strlen(name);
+       int i;
+
+       for (i = 0; i < map_size; i++)
+               if (namelen == map[i].namelen &&
+                   !string_enum_compare(name, map[i].name, namelen)) {
+                       *value = map[i].value;
+                       return TRUE;
+               }
+
+       return FALSE;
+}
+
+#define map_enum(attr, map, name) \
+       map_enum_do(map, ARRAY_SIZE(map), attr, name)
+
 #define prefixcmp(str1, str2) \
        strncmp(str1, str2, STRING_SIZE(str2))
 
@@ -289,47 +336,517 @@ suffixcmp(const char *str, int slen, const char *suffix)
        return suffixlen < len ? strcmp(str + len - suffixlen, suffix) : -1;
 }
 
-/* Shell quoting
- *
- * NOTE: The following is a slightly modified copy of the git project's shell
- * quoting routines found in the quote.c file.
- *
- * Help to copy the thing properly quoted for the shell safety.  any single
- * quote is replaced with '\'', any exclamation point is replaced with '\!',
- * and the whole thing is enclosed in a
- *
- * E.g.
- *  original     sq_quote     result
- *  name     ==> name      ==> 'name'
- *  a b      ==> a b       ==> 'a b'
- *  a'b      ==> a'\''b    ==> 'a'\''b'
- *  a!b      ==> a'\!'b    ==> 'a'\!'b'
+
+/*
+ * What value of "tz" was in effect back then at "time" in the
+ * local timezone?
  */
+static int local_tzoffset(time_t time)
+{
+       time_t t, t_local;
+       struct tm tm;
+       int offset, eastwest; 
 
-static size_t
-sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
+       t = time;
+       localtime_r(&t, &tm);
+       t_local = mktime(&tm);
+
+       if (t_local < t) {
+               eastwest = -1;
+               offset = t - t_local;
+       } else {
+               eastwest = 1;
+               offset = t_local - t;
+       }
+       offset /= 60; /* in minutes */
+       offset = (offset % 60) + ((offset / 60) * 100);
+       return offset * eastwest;
+}
+
+enum date {
+       DATE_NONE = 0,
+       DATE_DEFAULT,
+       DATE_RELATIVE,
+       DATE_SHORT
+};
+
+static char *
+string_date(const time_t *time, enum date date)
+{
+       static char buf[DATE_COLS + 1];
+       static const struct enum_map reldate[] = {
+               { "second", 1,                  60 * 2 },
+               { "minute", 60,                 60 * 60 * 2 },
+               { "hour",   60 * 60,            60 * 60 * 24 * 2 },
+               { "day",    60 * 60 * 24,       60 * 60 * 24 * 7 * 2 },
+               { "week",   60 * 60 * 24 * 7,   60 * 60 * 24 * 7 * 5 },
+               { "month",  60 * 60 * 24 * 30,  60 * 60 * 24 * 30 * 12 },
+       };
+       struct tm tm;
+
+       if (date == DATE_RELATIVE) {
+               struct timeval now;
+               time_t date = *time + local_tzoffset(*time);
+               time_t seconds;
+               int i;
+
+               gettimeofday(&now, NULL);
+               seconds = now.tv_sec < date ? date - now.tv_sec : now.tv_sec - date;
+               for (i = 0; i < ARRAY_SIZE(reldate); i++) {
+                       if (seconds >= reldate[i].value)
+                               continue;
+
+                       seconds /= reldate[i].namelen;
+                       if (!string_format(buf, "%ld %s%s %s",
+                                          seconds, reldate[i].name,
+                                          seconds > 1 ? "s" : "",
+                                          now.tv_sec >= date ? "ago" : "ahead"))
+                               break;
+                       return buf;
+               }
+       }
+
+       gmtime_r(time, &tm);
+       return strftime(buf, sizeof(buf), DATE_FORMAT, &tm) ? buf : NULL;
+}
+
+
+static bool
+argv_from_string(const char *argv[SIZEOF_ARG], int *argc, char *cmd)
+{
+       int valuelen;
+
+       while (*cmd && *argc < SIZEOF_ARG && (valuelen = strcspn(cmd, " \t"))) {
+               bool advance = cmd[valuelen] != 0;
+
+               cmd[valuelen] = 0;
+               argv[(*argc)++] = chomp_string(cmd);
+               cmd = chomp_string(cmd + valuelen + advance);
+       }
+
+       if (*argc < SIZEOF_ARG)
+               argv[*argc] = NULL;
+       return *argc < SIZEOF_ARG;
+}
+
+static void
+argv_from_env(const char **argv, const char *name)
+{
+       char *env = argv ? getenv(name) : NULL;
+       int argc = 0;
+
+       if (env && *env)
+               env = strdup(env);
+       if (env && !argv_from_string(argv, &argc, env))
+               die("Too many arguments in the `%s` environment variable", name);
+}
+
+
+/*
+ * Executing external commands.
+ */
+
+enum io_type {
+       IO_FD,                  /* File descriptor based IO. */
+       IO_BG,                  /* Execute command in the background. */
+       IO_FG,                  /* Execute command with same std{in,out,err}. */
+       IO_RD,                  /* Read only fork+exec IO. */
+       IO_WR,                  /* Write only fork+exec IO. */
+       IO_AP,                  /* Append fork+exec output to file. */
+};
+
+struct io {
+       enum io_type type;      /* The requested type of pipe. */
+       const char *dir;        /* Directory from which to execute. */
+       pid_t pid;              /* Pipe for reading or writing. */
+       int pipe;               /* Pipe end for reading or writing. */
+       int error;              /* Error status. */
+       const char *argv[SIZEOF_ARG];   /* Shell command arguments. */
+       char *buf;              /* Read buffer. */
+       size_t bufalloc;        /* Allocated buffer size. */
+       size_t bufsize;         /* Buffer content size. */
+       char *bufpos;           /* Current buffer position. */
+       unsigned int eof:1;     /* Has end of file been reached. */
+};
+
+static void
+reset_io(struct io *io)
+{
+       io->pipe = -1;
+       io->pid = 0;
+       io->buf = io->bufpos = NULL;
+       io->bufalloc = io->bufsize = 0;
+       io->error = 0;
+       io->eof = 0;
+}
+
+static void
+init_io(struct io *io, const char *dir, enum io_type type)
+{
+       reset_io(io);
+       io->type = type;
+       io->dir = dir;
+}
+
+static bool
+init_io_rd(struct io *io, const char *argv[], const char *dir,
+               enum format_flags flags)
+{
+       init_io(io, dir, IO_RD);
+       return format_argv(io->argv, argv, flags);
+}
+
+static bool
+io_open(struct io *io, const char *fmt, ...)
+{
+       char name[SIZEOF_STR] = "";
+       bool fits;
+       va_list args;
+
+       init_io(io, NULL, IO_FD);
+
+       va_start(args, fmt);
+       fits = vsnprintf(name, sizeof(name), fmt, args) < sizeof(name);
+       va_end(args);
+
+       if (!fits) {
+               io->error = ENAMETOOLONG;
+               return FALSE;
+       }
+       io->pipe = *name ? open(name, O_RDONLY) : STDIN_FILENO;
+       if (io->pipe == -1)
+               io->error = errno;
+       return io->pipe != -1;
+}
+
+static bool
+kill_io(struct io *io)
+{
+       return io->pid == 0 || kill(io->pid, SIGKILL) != -1;
+}
+
+static bool
+done_io(struct io *io)
 {
-       char c;
+       pid_t pid = io->pid;
+
+       if (io->pipe != -1)
+               close(io->pipe);
+       free(io->buf);
+       reset_io(io);
+
+       while (pid > 0) {
+               int status;
+               pid_t waiting = waitpid(pid, &status, 0);
+
+               if (waiting < 0) {
+                       if (errno == EINTR)
+                               continue;
+                       report("waitpid failed (%s)", strerror(errno));
+                       return FALSE;
+               }
+
+               return waiting == pid &&
+                      !WIFSIGNALED(status) &&
+                      WIFEXITED(status) &&
+                      !WEXITSTATUS(status);
+       }
 
-#define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
+       return TRUE;
+}
+
+static bool
+start_io(struct io *io)
+{
+       int pipefds[2] = { -1, -1 };
+
+       if (io->type == IO_FD)
+               return TRUE;
+
+       if ((io->type == IO_RD || io->type == IO_WR) &&
+           pipe(pipefds) < 0)
+               return FALSE;
+       else if (io->type == IO_AP)
+               pipefds[1] = io->pipe;
+
+       if ((io->pid = fork())) {
+               if (pipefds[!(io->type == IO_WR)] != -1)
+                       close(pipefds[!(io->type == IO_WR)]);
+               if (io->pid != -1) {
+                       io->pipe = pipefds[!!(io->type == IO_WR)];
+                       return TRUE;
+               }
+
+       } else {
+               if (io->type != IO_FG) {
+                       int devnull = open("/dev/null", O_RDWR);
+                       int readfd  = io->type == IO_WR ? pipefds[0] : devnull;
+                       int writefd = (io->type == IO_RD || io->type == IO_AP)
+                                                       ? pipefds[1] : devnull;
+
+                       dup2(readfd,  STDIN_FILENO);
+                       dup2(writefd, STDOUT_FILENO);
+                       dup2(devnull, STDERR_FILENO);
+
+                       close(devnull);
+                       if (pipefds[0] != -1)
+                               close(pipefds[0]);
+                       if (pipefds[1] != -1)
+                               close(pipefds[1]);
+               }
+
+               if (io->dir && *io->dir && chdir(io->dir) == -1)
+                       die("Failed to change directory: %s", strerror(errno));
+
+               execvp(io->argv[0], (char *const*) io->argv);
+               die("Failed to execute program: %s", strerror(errno));
+       }
+
+       if (pipefds[!!(io->type == IO_WR)] != -1)
+               close(pipefds[!!(io->type == IO_WR)]);
+       return FALSE;
+}
+
+static bool
+run_io(struct io *io, const char **argv, const char *dir, enum io_type type)
+{
+       init_io(io, dir, type);
+       if (!format_argv(io->argv, argv, FORMAT_NONE))
+               return FALSE;
+       return start_io(io);
+}
+
+static int
+run_io_do(struct io *io)
+{
+       return start_io(io) && done_io(io);
+}
+
+static int
+run_io_bg(const char **argv)
+{
+       struct io io = {};
+
+       init_io(&io, NULL, IO_BG);
+       if (!format_argv(io.argv, argv, FORMAT_NONE))
+               return FALSE;
+       return run_io_do(&io);
+}
+
+static bool
+run_io_fg(const char **argv, const char *dir)
+{
+       struct io io = {};
+
+       init_io(&io, dir, IO_FG);
+       if (!format_argv(io.argv, argv, FORMAT_NONE))
+               return FALSE;
+       return run_io_do(&io);
+}
+
+static bool
+run_io_append(const char **argv, enum format_flags flags, int fd)
+{
+       struct io io = {};
+
+       init_io(&io, NULL, IO_AP);
+       io.pipe = fd;
+       if (format_argv(io.argv, argv, flags))
+               return run_io_do(&io);
+       close(fd);
+       return FALSE;
+}
+
+static bool
+run_io_rd(struct io *io, const char **argv, const char *dir, enum format_flags flags)
+{
+       return init_io_rd(io, argv, dir, flags) && start_io(io);
+}
+
+static bool
+io_eof(struct io *io)
+{
+       return io->eof;
+}
+
+static int
+io_error(struct io *io)
+{
+       return io->error;
+}
+
+static char *
+io_strerror(struct io *io)
+{
+       return strerror(io->error);
+}
+
+static bool
+io_can_read(struct io *io)
+{
+       struct timeval tv = { 0, 500 };
+       fd_set fds;
+
+       FD_ZERO(&fds);
+       FD_SET(io->pipe, &fds);
+
+       return select(io->pipe + 1, &fds, NULL, NULL, &tv) > 0;
+}
+
+static ssize_t
+io_read(struct io *io, void *buf, size_t bufsize)
+{
+       do {
+               ssize_t readsize = read(io->pipe, buf, bufsize);
+
+               if (readsize < 0 && (errno == EAGAIN || errno == EINTR))
+                       continue;
+               else if (readsize == -1)
+                       io->error = errno;
+               else if (readsize == 0)
+                       io->eof = 1;
+               return readsize;
+       } while (1);
+}
+
+DEFINE_ALLOCATOR(realloc_io_buf, char, BUFSIZ)
+
+static char *
+io_get(struct io *io, int c, bool can_read)
+{
+       char *eol;
+       ssize_t readsize;
+
+       while (TRUE) {
+               if (io->bufsize > 0) {
+                       eol = memchr(io->bufpos, c, io->bufsize);
+                       if (eol) {
+                               char *line = io->bufpos;
+
+                               *eol = 0;
+                               io->bufpos = eol + 1;
+                               io->bufsize -= io->bufpos - line;
+                               return line;
+                       }
+               }
+
+               if (io_eof(io)) {
+                       if (io->bufsize) {
+                               io->bufpos[io->bufsize] = 0;
+                               io->bufsize = 0;
+                               return io->bufpos;
+                       }
+                       return NULL;
+               }
+
+               if (!can_read)
+                       return NULL;
+
+               if (io->bufsize > 0 && io->bufpos > io->buf)
+                       memmove(io->buf, io->bufpos, io->bufsize);
+
+               if (io->bufalloc == io->bufsize) {
+                       if (!realloc_io_buf(&io->buf, io->bufalloc, BUFSIZ))
+                               return NULL;
+                       io->bufalloc += BUFSIZ;
+               }
+
+               io->bufpos = io->buf;
+               readsize = io_read(io, io->buf + io->bufsize, io->bufalloc - io->bufsize);
+               if (io_error(io))
+                       return NULL;
+               io->bufsize += readsize;
+       }
+}
+
+static bool
+io_write(struct io *io, const void *buf, size_t bufsize)
+{
+       size_t written = 0;
+
+       while (!io_error(io) && written < bufsize) {
+               ssize_t size;
+
+               size = write(io->pipe, buf + written, bufsize - written);
+               if (size < 0 && (errno == EAGAIN || errno == EINTR))
+                       continue;
+               else if (size == -1)
+                       io->error = errno;
+               else
+                       written += size;
+       }
+
+       return written == bufsize;
+}
+
+static bool
+io_read_buf(struct io *io, char buf[], size_t bufsize)
+{
+       char *result = io_get(io, '\n', TRUE);
+
+       if (result) {
+               result = chomp_string(result);
+               string_ncopy_do(buf, bufsize, result, strlen(result));
+       }
+
+       return done_io(io) && result;
+}
+
+static bool
+run_io_buf(const char **argv, char buf[], size_t bufsize)
+{
+       struct io io = {};
+
+       return run_io_rd(&io, argv, NULL, FORMAT_NONE)
+           && io_read_buf(&io, buf, bufsize);
+}
+
+static int
+io_load(struct io *io, const char *separators,
+       int (*read_property)(char *, size_t, char *, size_t))
+{
+       char *name;
+       int state = OK;
+
+       if (!start_io(io))
+               return ERR;
+
+       while (state == OK && (name = io_get(io, '\n', TRUE))) {
+               char *value;
+               size_t namelen;
+               size_t valuelen;
+
+               name = chomp_string(name);
+               namelen = strcspn(name, separators);
+
+               if (name[namelen]) {
+                       name[namelen] = 0;
+                       value = chomp_string(name + namelen + 1);
+                       valuelen = strlen(value);
 
-       BUFPUT('\'');
-       while ((c = *src++)) {
-               if (c == '\'' || c == '!') {
-                       BUFPUT('\'');
-                       BUFPUT('\\');
-                       BUFPUT(c);
-                       BUFPUT('\'');
                } else {
-                       BUFPUT(c);
+                       value = "";
+                       valuelen = 0;
                }
+
+               state = read_property(name, namelen, value, valuelen);
        }
-       BUFPUT('\'');
 
-       if (bufsize < SIZEOF_STR)
-               buf[bufsize] = 0;
+       if (state != ERR && io_error(io))
+               state = ERR;
+       done_io(io);
+
+       return state;
+}
+
+static int
+run_io_load(const char **argv, const char *separators,
+           int (*read_property)(char *, size_t, char *, size_t))
+{
+       struct io io = {};
 
-       return bufsize;
+       return init_io_rd(&io, argv, NULL, FORMAT_NONE)
+               ? io_load(&io, separators, read_property) : ERR;
 }
 
 
@@ -346,6 +863,7 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(VIEW_TREE,         "Show tree view"), \
        REQ_(VIEW_BLOB,         "Show blob view"), \
        REQ_(VIEW_BLAME,        "Show blame view"), \
+       REQ_(VIEW_BRANCH,       "Show branch view"), \
        REQ_(VIEW_HELP,         "Show help page"), \
        REQ_(VIEW_PAGER,        "Show pager view"), \
        REQ_(VIEW_STATUS,       "Show status view"), \
@@ -355,6 +873,7 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(ENTER,             "Enter current line and scroll"), \
        REQ_(NEXT,              "Move to next"), \
        REQ_(PREVIOUS,          "Move to previous"), \
+       REQ_(PARENT,            "Move to parent"), \
        REQ_(VIEW_NEXT,         "Move focus to next view"), \
        REQ_(REFRESH,           "Reload and refresh"), \
        REQ_(MAXIMIZE,          "Maximize the current view"), \
@@ -366,7 +885,6 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(STATUS_REVERT,     "Revert file changes"), \
        REQ_(STATUS_MERGE,      "Merge file using external tool"), \
        REQ_(STAGE_NEXT,        "Find next chunk to stage"), \
-       REQ_(TREE_PARENT,       "Switch to parent directory in tree view"), \
        \
        REQ_GROUP("Cursor navigation") \
        REQ_(MOVE_UP,           "Move cursor one line up"), \
@@ -377,6 +895,8 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(MOVE_LAST_LINE,    "Move cursor to last line"), \
        \
        REQ_GROUP("Scrolling") \
+       REQ_(SCROLL_LEFT,       "Scroll two columns left"), \
+       REQ_(SCROLL_RIGHT,      "Scroll two columns right"), \
        REQ_(SCROLL_LINE_UP,    "Scroll one line up"), \
        REQ_(SCROLL_LINE_DOWN,  "Scroll one line down"), \
        REQ_(SCROLL_PAGE_UP,    "Scroll one page up"), \
@@ -389,16 +909,19 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(FIND_PREV,         "Find previous search match"), \
        \
        REQ_GROUP("Option manipulation") \
+       REQ_(OPTIONS,           "Open option menu"), \
        REQ_(TOGGLE_LINENO,     "Toggle line numbers"), \
        REQ_(TOGGLE_DATE,       "Toggle date display"), \
+       REQ_(TOGGLE_DATE_SHORT, "Toggle short (date-only) dates"), \
        REQ_(TOGGLE_AUTHOR,     "Toggle author display"), \
        REQ_(TOGGLE_REV_GRAPH,  "Toggle revision graph visualization"), \
        REQ_(TOGGLE_REFS,       "Toggle reference display (tags/branches)"), \
+       REQ_(TOGGLE_SORT_ORDER, "Toggle ascending/descending sort order"), \
+       REQ_(TOGGLE_SORT_FIELD, "Toggle field to sort by"), \
        \
        REQ_GROUP("Misc") \
        REQ_(PROMPT,            "Bring up the prompt"), \
        REQ_(SCREEN_REDRAW,     "Redraw the screen"), \
-       REQ_(SCREEN_RESIZE,     "Resize the screen"), \
        REQ_(SHOW_VERSION,      "Show version information"), \
        REQ_(STOP_LOADING,      "Stop all loading views"), \
        REQ_(EDIT,              "Open in editor"), \
@@ -425,7 +948,7 @@ struct request_info {
        const char *help;
 };
 
-static struct request_info req_info[] = {
+static const struct request_info req_info[] = {
 #define REQ_GROUP(help)        { 0, NULL, 0, (help) },
 #define REQ_(req, help)        { REQ_##req, (#req), STRING_SIZE(#req), (help) }
        REQ_INFO
@@ -452,133 +975,39 @@ get_request(const char *name)
  * Options
  */
 
-static const char usage[] =
-"tig " TIG_VERSION " (" __DATE__ ")\n"
-"\n"
-"Usage: tig        [options] [revs] [--] [paths]\n"
-"   or: tig show   [options] [revs] [--] [paths]\n"
-"   or: tig blame  [rev] path\n"
-"   or: tig status\n"
-"   or: tig <      [git command output]\n"
-"\n"
-"Options:\n"
-"  -v, --version   Show version and exit\n"
-"  -h, --help      Show help message and exit";
-
 /* Option and state variables. */
-static bool opt_date                   = TRUE;
+static enum date opt_date              = DATE_DEFAULT;
 static bool opt_author                 = TRUE;
 static bool opt_line_number            = FALSE;
 static bool opt_line_graphics          = TRUE;
 static bool opt_rev_graph              = FALSE;
 static bool opt_show_refs              = TRUE;
-static int opt_num_interval            = NUMBER_INTERVAL;
-static int opt_tab_size                        = TAB_SIZE;
-static int opt_author_cols             = AUTHOR_COLS-1;
-static char opt_cmd[SIZEOF_STR]                = "";
+static int opt_num_interval            = 5;
+static double opt_hscroll              = 0.50;
+static double opt_scale_split_view     = 2.0 / 3.0;
+static int opt_tab_size                        = 8;
+static int opt_author_cols             = 19;
 static char opt_path[SIZEOF_STR]       = "";
 static char opt_file[SIZEOF_STR]       = "";
 static char opt_ref[SIZEOF_REF]                = "";
 static char opt_head[SIZEOF_REF]       = "";
 static char opt_head_rev[SIZEOF_REV]   = "";
 static char opt_remote[SIZEOF_REF]     = "";
-static FILE *opt_pipe                  = NULL;
 static char opt_encoding[20]           = "UTF-8";
 static bool opt_utf8                   = TRUE;
 static char opt_codeset[20]            = "UTF-8";
 static iconv_t opt_iconv               = ICONV_NONE;
 static char opt_search[SIZEOF_STR]     = "";
 static char opt_cdup[SIZEOF_STR]       = "";
+static char opt_prefix[SIZEOF_STR]     = "";
 static char opt_git_dir[SIZEOF_STR]    = "";
 static signed char opt_is_inside_work_tree     = -1; /* set to TRUE or FALSE */
 static char opt_editor[SIZEOF_STR]     = "";
 static FILE *opt_tty                   = NULL;
 
 #define is_initial_commit()    (!*opt_head_rev)
-
-static enum request
-parse_options(int argc, const char *argv[])
-{
-       enum request request = REQ_VIEW_MAIN;
-       size_t buf_size;
-       const char *subcommand;
-       bool seen_dashdash = FALSE;
-       int i;
-
-       if (!isatty(STDIN_FILENO)) {
-               opt_pipe = stdin;
-               return REQ_VIEW_PAGER;
-       }
-
-       if (argc <= 1)
-               return REQ_VIEW_MAIN;
-
-       subcommand = argv[1];
-       if (!strcmp(subcommand, "status") || !strcmp(subcommand, "-S")) {
-               if (!strcmp(subcommand, "-S"))
-                       warn("`-S' has been deprecated; use `tig status' instead");
-               if (argc > 2)
-                       warn("ignoring arguments after `%s'", subcommand);
-               return REQ_VIEW_STATUS;
-
-       } else if (!strcmp(subcommand, "blame")) {
-               if (argc <= 2 || argc > 4)
-                       die("invalid number of options to blame\n\n%s", usage);
-
-               i = 2;
-               if (argc == 4) {
-                       string_ncopy(opt_ref, argv[i], strlen(argv[i]));
-                       i++;
-               }
-
-               string_ncopy(opt_file, argv[i], strlen(argv[i]));
-               return REQ_VIEW_BLAME;
-
-       } else if (!strcmp(subcommand, "show")) {
-               request = REQ_VIEW_DIFF;
-
-       } else if (!strcmp(subcommand, "log") || !strcmp(subcommand, "diff")) {
-               request = subcommand[0] == 'l' ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
-               warn("`tig %s' has been deprecated", subcommand);
-
-       } else {
-               subcommand = NULL;
-       }
-
-       if (!subcommand)
-               /* XXX: This is vulnerable to the user overriding
-                * options required for the main view parser. */
-               string_copy(opt_cmd, TIG_MAIN_BASE);
-       else
-               string_format(opt_cmd, "git %s", subcommand);
-
-       buf_size = strlen(opt_cmd);
-
-       for (i = 1 + !!subcommand; i < argc; i++) {
-               const char *opt = argv[i];
-
-               if (seen_dashdash || !strcmp(opt, "--")) {
-                       seen_dashdash = TRUE;
-
-               } else if (!strcmp(opt, "-v") || !strcmp(opt, "--version")) {
-                       printf("tig version %s\n", TIG_VERSION);
-                       return REQ_NONE;
-
-               } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
-                       printf("%s\n", usage);
-                       return REQ_NONE;
-               }
-
-               opt_cmd[buf_size++] = ' ';
-               buf_size = sq_quote(opt_cmd, buf_size, opt);
-               if (buf_size >= sizeof(opt_cmd))
-                       die("command too long");
-       }
-
-       opt_cmd[buf_size] = 0;
-
-       return request;
-}
+#define is_head_commit(rev)    (!strcmp((rev), "HEAD") || !strcmp(opt_head_rev, (rev)))
+#define mkdate(time)           string_date(time, opt_date)
 
 
 /*
@@ -610,7 +1039,7 @@ LINE(PP_REFS,         "Refs: ",            COLOR_RED,      COLOR_DEFAULT,  0), \
 LINE(COMMIT,      "commit ",           COLOR_GREEN,    COLOR_DEFAULT,  0), \
 LINE(PARENT,      "parent ",           COLOR_BLUE,     COLOR_DEFAULT,  0), \
 LINE(TREE,        "tree ",             COLOR_BLUE,     COLOR_DEFAULT,  0), \
-LINE(AUTHOR,      "author ",           COLOR_CYAN,     COLOR_DEFAULT,  0), \
+LINE(AUTHOR,      "author ",           COLOR_GREEN,    COLOR_DEFAULT,  0), \
 LINE(COMMITTER,           "committer ",        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(SIGNOFF,     "    Signed-off-by", COLOR_YELLOW,   COLOR_DEFAULT,  0), \
 LINE(ACKED,       "    Acked-by",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
@@ -619,10 +1048,10 @@ LINE(CURSOR,        "",                  COLOR_WHITE,    COLOR_GREEN,    A_BOLD), \
 LINE(STATUS,      "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
 LINE(DELIMITER,           "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(DATE,         "",                 COLOR_BLUE,     COLOR_DEFAULT,  0), \
+LINE(MODE,         "",                 COLOR_CYAN,     COLOR_DEFAULT,  0), \
 LINE(LINE_NUMBER,  "",                 COLOR_CYAN,     COLOR_DEFAULT,  0), \
 LINE(TITLE_BLUR,   "",                 COLOR_WHITE,    COLOR_BLUE,     0), \
 LINE(TITLE_FOCUS,  "",                 COLOR_WHITE,    COLOR_BLUE,     A_BOLD), \
-LINE(MAIN_AUTHOR,  "",                 COLOR_GREEN,    COLOR_DEFAULT,  0), \
 LINE(MAIN_COMMIT,  "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
 LINE(MAIN_TAG,     "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
 LINE(MAIN_LOCAL_TAG,"",                        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
@@ -631,7 +1060,8 @@ LINE(MAIN_TRACKED, "",                     COLOR_YELLOW,   COLOR_DEFAULT,  A_BOLD), \
 LINE(MAIN_REF,     "",                 COLOR_CYAN,     COLOR_DEFAULT,  0), \
 LINE(MAIN_HEAD,    "",                 COLOR_CYAN,     COLOR_DEFAULT,  A_BOLD), \
 LINE(MAIN_REVGRAPH,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
-LINE(TREE_DIR,     "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
+LINE(TREE_HEAD,    "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  A_BOLD), \
+LINE(TREE_DIR,     "",                 COLOR_YELLOW,   COLOR_DEFAULT,  A_NORMAL), \
 LINE(TREE_FILE,    "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
 LINE(STAT_HEAD,    "",                 COLOR_YELLOW,   COLOR_DEFAULT,  0), \
 LINE(STAT_SECTION, "",                 COLOR_CYAN,     COLOR_DEFAULT,  0), \
@@ -639,6 +1069,8 @@ LINE(STAT_NONE,    "",                     COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
 LINE(STAT_STAGED,  "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(STAT_UNSTAGED,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(STAT_UNTRACKED,"",                        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
+LINE(HELP_KEYMAP,  "",                 COLOR_CYAN,     COLOR_DEFAULT,  0), \
+LINE(HELP_GROUP,   "",                 COLOR_BLUE,     COLOR_DEFAULT,  0), \
 LINE(BLAME_ID,     "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0)
 
 enum line_type {
@@ -729,6 +1161,8 @@ struct line {
        /* State flags */
        unsigned int selected:1;
        unsigned int dirty:1;
+       unsigned int cleareol:1;
+       unsigned int other:16;
 
        void *data;             /* User data */
 };
@@ -741,10 +1175,9 @@ struct line {
 struct keybinding {
        int alias;
        enum request request;
-       struct keybinding *next;
 };
 
-static struct keybinding default_keybindings[] = {
+static const struct keybinding default_keybindings[] = {
        /* View switching */
        { 'm',          REQ_VIEW_MAIN },
        { 'd',          REQ_VIEW_DIFF },
@@ -752,6 +1185,7 @@ static struct keybinding default_keybindings[] = {
        { 't',          REQ_VIEW_TREE },
        { 'f',          REQ_VIEW_BLOB },
        { 'B',          REQ_VIEW_BLAME },
+       { 'H',          REQ_VIEW_BRANCH },
        { 'p',          REQ_VIEW_PAGER },
        { 'h',          REQ_VIEW_HELP },
        { 'S',          REQ_VIEW_STATUS },
@@ -779,6 +1213,8 @@ static struct keybinding default_keybindings[] = {
        { '-',          REQ_MOVE_PAGE_UP },
 
        /* Scrolling */
+       { KEY_LEFT,     REQ_SCROLL_LEFT },
+       { KEY_RIGHT,    REQ_SCROLL_RIGHT },
        { KEY_IC,       REQ_SCROLL_LINE_UP },
        { KEY_DC,       REQ_SCROLL_LINE_DOWN },
        { 'w',          REQ_SCROLL_PAGE_UP },
@@ -795,21 +1231,21 @@ static struct keybinding default_keybindings[] = {
        { 'z',          REQ_STOP_LOADING },
        { 'v',          REQ_SHOW_VERSION },
        { 'r',          REQ_SCREEN_REDRAW },
+       { 'o',          REQ_OPTIONS },
        { '.',          REQ_TOGGLE_LINENO },
        { 'D',          REQ_TOGGLE_DATE },
        { 'A',          REQ_TOGGLE_AUTHOR },
        { 'g',          REQ_TOGGLE_REV_GRAPH },
        { 'F',          REQ_TOGGLE_REFS },
+       { 'I',          REQ_TOGGLE_SORT_ORDER },
+       { 'i',          REQ_TOGGLE_SORT_FIELD },
        { ':',          REQ_PROMPT },
        { 'u',          REQ_STATUS_UPDATE },
        { '!',          REQ_STATUS_REVERT },
        { 'M',          REQ_STATUS_MERGE },
        { '@',          REQ_STAGE_NEXT },
-       { ',',          REQ_TREE_PARENT },
+       { ',',          REQ_PARENT },
        { 'e',          REQ_EDIT },
-
-       /* Using the ncurses SIGWINCH handler. */
-       { KEY_RESIZE,   REQ_SCREEN_RESIZE },
 };
 
 #define KEYMAP_INFO \
@@ -820,6 +1256,7 @@ static struct keybinding default_keybindings[] = {
        KEYMAP_(TREE), \
        KEYMAP_(BLOB), \
        KEYMAP_(BLAME), \
+       KEYMAP_(BRANCH), \
        KEYMAP_(PAGER), \
        KEYMAP_(HELP), \
        KEYMAP_(STATUS), \
@@ -831,30 +1268,31 @@ enum keymap {
 #undef KEYMAP_
 };
 
-static struct int_map keymap_table[] = {
-#define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
+static const struct enum_map keymap_table[] = {
+#define KEYMAP_(name) ENUM_MAP(#name, KEYMAP_##name)
        KEYMAP_INFO
 #undef KEYMAP_
 };
 
-#define set_keymap(map, name) \
-       set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
+#define set_keymap(map, name) map_enum(map, keymap_table, name)
+
+struct keybinding_table {
+       struct keybinding *data;
+       size_t size;
+};
 
-static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
+static struct keybinding_table keybindings[ARRAY_SIZE(keymap_table)];
 
 static void
 add_keybinding(enum keymap keymap, enum request request, int key)
 {
-       struct keybinding *keybinding;
+       struct keybinding_table *table = &keybindings[keymap];
 
-       keybinding = calloc(1, sizeof(*keybinding));
-       if (!keybinding)
+       table->data = realloc(table->data, (table->size + 1) * sizeof(*table->data));
+       if (!table->data)
                die("Failed to allocate keybinding");
-
-       keybinding->alias = key;
-       keybinding->request = request;
-       keybinding->next = keybindings[keymap];
-       keybindings[keymap] = keybinding;
+       table->data[table->size].alias = key;
+       table->data[table->size++].request = request;
 }
 
 /* Looks for a key binding first in the given map, then in the generic map, and
@@ -862,16 +1300,15 @@ add_keybinding(enum keymap keymap, enum request request, int key)
 static enum request
 get_keybinding(enum keymap keymap, int key)
 {
-       struct keybinding *kbd;
-       int i;
+       size_t i;
 
-       for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
-               if (kbd->alias == key)
-                       return kbd->request;
+       for (i = 0; i < keybindings[keymap].size; i++)
+               if (keybindings[keymap].data[i].alias == key)
+                       return keybindings[keymap].data[i].request;
 
-       for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
-               if (kbd->alias == key)
-                       return kbd->request;
+       for (i = 0; i < keybindings[KEYMAP_GENERIC].size; i++)
+               if (keybindings[KEYMAP_GENERIC].data[i].alias == key)
+                       return keybindings[KEYMAP_GENERIC].data[i].request;
 
        for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
                if (default_keybindings[i].alias == key)
@@ -886,7 +1323,7 @@ struct key {
        int value;
 };
 
-static struct key key_table[] = {
+static const struct key key_table[] = {
        { "Enter",      KEY_RETURN },
        { "Space",      ' ' },
        { "Backspace",  KEY_BACKSPACE },
@@ -953,26 +1390,68 @@ get_key_name(int key_value)
        return seq ? seq : "(no key)";
 }
 
+static bool
+append_key(char *buf, size_t *pos, const struct keybinding *keybinding)
+{
+       const char *sep = *pos > 0 ? ", " : "";
+       const char *keyname = get_key_name(keybinding->alias);
+
+       return string_nformat(buf, BUFSIZ, pos, "%s%s", sep, keyname);
+}
+
+static bool
+append_keymap_request_keys(char *buf, size_t *pos, enum request request,
+                          enum keymap keymap, bool all)
+{
+       int i;
+
+       for (i = 0; i < keybindings[keymap].size; i++) {
+               if (keybindings[keymap].data[i].request == request) {
+                       if (!append_key(buf, pos, &keybindings[keymap].data[i]))
+                               return FALSE;
+                       if (!all)
+                               break;
+               }
+       }
+
+       return TRUE;
+}
+
+#define get_key(keymap, request) get_keys(keymap, request, FALSE)
+
 static const char *
-get_key(enum request request)
+get_keys(enum keymap keymap, enum request request, bool all)
 {
        static char buf[BUFSIZ];
        size_t pos = 0;
-       char *sep = "";
        int i;
 
        buf[pos] = 0;
 
-       for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
-               struct keybinding *keybinding = &default_keybindings[i];
+       if (!append_keymap_request_keys(buf, &pos, request, keymap, all))
+               return "Too many keybindings!";
+       if (pos > 0 && !all)
+               return buf;
 
-               if (keybinding->request != request)
-                       continue;
+       if (keymap != KEYMAP_GENERIC) {
+               /* Only the generic keymap includes the default keybindings when
+                * listing all keys. */
+               if (all)
+                       return buf;
 
-               if (!string_format_from(buf, &pos, "%s%s", sep,
-                                       get_key_name(keybinding->alias)))
+               if (!append_keymap_request_keys(buf, &pos, request, KEYMAP_GENERIC, all))
                        return "Too many keybindings!";
-               sep = ", ";
+               if (pos)
+                       return buf;
+       }
+
+       for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
+               if (default_keybindings[i].request == request) {
+                       if (!append_key(buf, &pos, &default_keybindings[i]))
+                               return "Too many keybindings!";
+                       if (!all)
+                               return buf;
+               }
        }
 
        return buf;
@@ -981,34 +1460,34 @@ get_key(enum request request)
 struct run_request {
        enum keymap keymap;
        int key;
-       char cmd[SIZEOF_STR];
+       const char *argv[SIZEOF_ARG];
 };
 
 static struct run_request *run_request;
 static size_t run_requests;
 
+DEFINE_ALLOCATOR(realloc_run_requests, struct run_request, 8)
+
 static enum request
 add_run_request(enum keymap keymap, int key, int argc, const char **argv)
 {
        struct run_request *req;
-       char cmd[SIZEOF_STR];
-       size_t bufpos;
 
-       for (bufpos = 0; argc > 0; argc--, argv++)
-               if (!string_format_from(cmd, &bufpos, "%s ", *argv))
-                       return REQ_NONE;
+       if (argc >= ARRAY_SIZE(req->argv) - 1)
+               return REQ_NONE;
 
-       req = realloc(run_request, (run_requests + 1) * sizeof(*run_request));
-       if (!req)
+       if (!realloc_run_requests(&run_request, run_requests, 1))
                return REQ_NONE;
 
-       run_request = req;
-       req = &run_request[run_requests++];
-       string_copy(req->cmd, cmd);
+       req = &run_request[run_requests];
        req->keymap = keymap;
        req->key = key;
+       req->argv[0] = NULL;
+
+       if (!format_argv(req->argv, argv, FORMAT_NONE))
+               return REQ_NONE;
 
-       return REQ_NONE + run_requests;
+       return REQ_NONE + ++run_requests;
 }
 
 static struct run_request *
@@ -1022,20 +1501,25 @@ get_run_request(enum request request)
 static void
 add_builtin_run_requests(void)
 {
+       const char *cherry_pick[] = { "git", "cherry-pick", "%(commit)", NULL };
+       const char *commit[] = { "git", "commit", NULL };
+       const char *gc[] = { "git", "gc", NULL };
        struct {
                enum keymap keymap;
                int key;
-               const char *argv[1];
+               int argc;
+               const char **argv;
        } reqs[] = {
-               { KEYMAP_MAIN,    'C', { "git cherry-pick %(commit)" } },
-               { KEYMAP_GENERIC, 'G', { "git gc" } },
+               { KEYMAP_MAIN,    'C', ARRAY_SIZE(cherry_pick) - 1, cherry_pick },
+               { KEYMAP_STATUS,  'C', ARRAY_SIZE(commit) - 1, commit },
+               { KEYMAP_GENERIC, 'G', ARRAY_SIZE(gc) - 1, gc },
        };
        int i;
 
        for (i = 0; i < ARRAY_SIZE(reqs); i++) {
                enum request req;
 
-               req = add_run_request(reqs[i].keymap, reqs[i].key, 1, reqs[i].argv);
+               req = add_run_request(reqs[i].keymap, reqs[i].key, reqs[i].argc, reqs[i].argv);
                if (req != REQ_NONE)
                        add_keybinding(reqs[i].keymap, req, reqs[i].key);
        }
@@ -1045,8 +1529,12 @@ add_builtin_run_requests(void)
  * User config file handling.
  */
 
-static struct int_map color_map[] = {
-#define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
+static int   config_lineno;
+static bool  config_errors;
+static const char *config_msg;
+
+static const struct enum_map color_map[] = {
+#define COLOR_MAP(name) ENUM_MAP(#name, COLOR_##name)
        COLOR_MAP(DEFAULT),
        COLOR_MAP(BLACK),
        COLOR_MAP(BLUE),
@@ -1058,11 +1546,8 @@ static struct int_map color_map[] = {
        COLOR_MAP(YELLOW),
 };
 
-#define set_color(color, name) \
-       set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
-
-static struct int_map attr_map[] = {
-#define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
+static const struct enum_map attr_map[] = {
+#define ATTR_MAP(name) ENUM_MAP(#name, A_##name)
        ATTR_MAP(NORMAL),
        ATTR_MAP(BLINK),
        ATTR_MAP(BOLD),
@@ -1072,64 +1557,124 @@ static struct int_map attr_map[] = {
        ATTR_MAP(UNDERLINE),
 };
 
-#define set_attribute(attr, name) \
-       set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
+#define set_attribute(attr, name)      map_enum(attr, attr_map, name)
 
-static int   config_lineno;
-static bool  config_errors;
-static const char *config_msg;
+static int parse_step(double *opt, const char *arg)
+{
+       *opt = atoi(arg);
+       if (!strchr(arg, '%'))
+               return OK;
+
+       /* "Shift down" so 100% and 1 does not conflict. */
+       *opt = (*opt - 1) / 100;
+       if (*opt >= 1.0) {
+               *opt = 0.99;
+               config_msg = "Step value larger than 100%";
+               return ERR;
+       }
+       if (*opt < 0.0) {
+               *opt = 1;
+               config_msg = "Invalid step value";
+               return ERR;
+       }
+       return OK;
+}
+
+static int
+parse_int(int *opt, const char *arg, int min, int max)
+{
+       int value = atoi(arg);
+
+       if (min <= value && value <= max) {
+               *opt = value;
+               return OK;
+       }
+
+       config_msg = "Integer value out of bound";
+       return ERR;
+}
+
+static bool
+set_color(int *color, const char *name)
+{
+       if (map_enum(color, color_map, name))
+               return TRUE;
+       if (!prefixcmp(name, "color"))
+               return parse_int(color, name + 5, 0, 255) == OK;
+       return FALSE;
+}
 
-/* Wants: object fgcolor bgcolor [attr] */
+/* Wants: object fgcolor bgcolor [attribute] */
 static int
 option_color_command(int argc, const char *argv[])
 {
        struct line_info *info;
 
-       if (argc != 3 && argc != 4) {
+       if (argc < 3) {
                config_msg = "Wrong number of arguments given to color command";
                return ERR;
        }
 
        info = get_line_info(argv[0]);
        if (!info) {
-               if (!string_enum_compare(argv[0], "main-delim", strlen("main-delim"))) {
-                       info = get_line_info("delimiter");
-
-               } else if (!string_enum_compare(argv[0], "main-date", strlen("main-date"))) {
-                       info = get_line_info("date");
-
-               } else {
+               static const struct enum_map obsolete[] = {
+                       ENUM_MAP("main-delim",  LINE_DELIMITER),
+                       ENUM_MAP("main-date",   LINE_DATE),
+                       ENUM_MAP("main-author", LINE_AUTHOR),
+               };
+               int index;
+
+               if (!map_enum(&index, obsolete, argv[0])) {
                        config_msg = "Unknown color name";
                        return ERR;
                }
+               info = &line_info[index];
        }
 
-       if (set_color(&info->fg, argv[1]) == ERR ||
-           set_color(&info->bg, argv[2]) == ERR) {
+       if (!set_color(&info->fg, argv[1]) ||
+           !set_color(&info->bg, argv[2])) {
                config_msg = "Unknown color";
                return ERR;
        }
 
-       if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
-               config_msg = "Unknown attribute";
-               return ERR;
+       info->attr = 0;
+       while (argc-- > 3) {
+               int attr;
+
+               if (!set_attribute(&attr, argv[argc])) {
+                       config_msg = "Unknown attribute";
+                       return ERR;
+               }
+               info->attr |= attr;
        }
 
        return OK;
 }
 
-static bool parse_bool(const char *s)
+static int parse_bool(bool *opt, const char *arg)
 {
-       return (!strcmp(s, "1") || !strcmp(s, "true") ||
-               !strcmp(s, "yes")) ? TRUE : FALSE;
+       *opt = (!strcmp(arg, "1") || !strcmp(arg, "true") || !strcmp(arg, "yes"))
+               ? TRUE : FALSE;
+       return OK;
 }
 
 static int
-parse_int(const char *s, int default_value, int min, int max)
+parse_string(char *opt, const char *arg, size_t optsize)
 {
-       int value = atoi(s);
+       int arglen = strlen(arg);
 
-       return (value < min || value > max) ? default_value : value;
+       switch (arg[0]) {
+       case '\"':
+       case '\'':
+               if (arglen == 1 || arg[arglen - 1] != arg[0]) {
+                       config_msg = "Unmatched quotation";
+                       return ERR;
+               }
+               arg += 1; arglen -= 2;
+       default:
+               string_ncopy_do(opt, optsize, arg, arglen);
+               return OK;
+       }
 }
 
 /* Wants: name = value */
@@ -1146,68 +1691,53 @@ option_set_command(int argc, const char *argv[])
                return ERR;
        }
 
-       if (!strcmp(argv[0], "show-author")) {
-               opt_author = parse_bool(argv[2]);
-               return OK;
-       }
+       if (!strcmp(argv[0], "show-author"))
+               return parse_bool(&opt_author, argv[2]);
 
        if (!strcmp(argv[0], "show-date")) {
-               opt_date = parse_bool(argv[2]);
-               return OK;
-       }
+               bool show_date;
 
-       if (!strcmp(argv[0], "show-rev-graph")) {
-               opt_rev_graph = parse_bool(argv[2]);
-               return OK;
+               if (!strcmp(argv[2], "relative")) {
+                       opt_date = DATE_RELATIVE;
+                       return OK;
+               } else if (!strcmp(argv[2], "short")) {
+                       opt_date = DATE_SHORT;
+                       return OK;
+               } else if (parse_bool(&show_date, argv[2])) {
+                       opt_date = show_date ? DATE_DEFAULT : DATE_NONE;
+               }
+               return ERR;
        }
 
-       if (!strcmp(argv[0], "show-refs")) {
-               opt_show_refs = parse_bool(argv[2]);
-               return OK;
-       }
+       if (!strcmp(argv[0], "show-rev-graph"))
+               return parse_bool(&opt_rev_graph, argv[2]);
 
-       if (!strcmp(argv[0], "show-line-numbers")) {
-               opt_line_number = parse_bool(argv[2]);
-               return OK;
-       }
+       if (!strcmp(argv[0], "show-refs"))
+               return parse_bool(&opt_show_refs, argv[2]);
 
-       if (!strcmp(argv[0], "line-graphics")) {
-               opt_line_graphics = parse_bool(argv[2]);
-               return OK;
-       }
+       if (!strcmp(argv[0], "show-line-numbers"))
+               return parse_bool(&opt_line_number, argv[2]);
 
-       if (!strcmp(argv[0], "line-number-interval")) {
-               opt_num_interval = parse_int(argv[2], opt_num_interval, 1, 1024);
-               return OK;
-       }
+       if (!strcmp(argv[0], "line-graphics"))
+               return parse_bool(&opt_line_graphics, argv[2]);
 
-       if (!strcmp(argv[0], "author-width")) {
-               opt_author_cols = parse_int(argv[2], opt_author_cols, 0, 1024);
-               return OK;
-       }
+       if (!strcmp(argv[0], "line-number-interval"))
+               return parse_int(&opt_num_interval, argv[2], 1, 1024);
 
-       if (!strcmp(argv[0], "tab-size")) {
-               opt_tab_size = parse_int(argv[2], opt_tab_size, 1, 1024);
-               return OK;
-       }
+       if (!strcmp(argv[0], "author-width"))
+               return parse_int(&opt_author_cols, argv[2], 0, 1024);
 
-       if (!strcmp(argv[0], "commit-encoding")) {
-               const char *arg = argv[2];
-               int arglen = strlen(arg);
+       if (!strcmp(argv[0], "horizontal-scroll"))
+               return parse_step(&opt_hscroll, argv[2]);
 
-               switch (arg[0]) {
-               case '"':
-               case '\'':
-                       if (arglen == 1 || arg[arglen - 1] != arg[0]) {
-                               config_msg = "Unmatched quotation";
-                               return ERR;
-                       }
-                       arg += 1; arglen -= 2;
-               default:
-                       string_ncopy(opt_encoding, arg, strlen(arg));
-                       return OK;
-               }
-       }
+       if (!strcmp(argv[0], "split-view-height"))
+               return parse_step(&opt_scale_split_view, argv[2]);
+
+       if (!strcmp(argv[0], "tab-size"))
+               return parse_int(&opt_tab_size, argv[2], 1, 1024);
+
+       if (!strcmp(argv[0], "commit-encoding"))
+               return parse_string(opt_encoding, argv[2], sizeof(opt_encoding));
 
        config_msg = "Unknown variable name";
        return ERR;
@@ -1218,7 +1748,7 @@ static int
 option_bind_command(int argc, const char *argv[])
 {
        enum request request;
-       int keymap;
+       int keymap = -1;
        int key;
 
        if (argc < 3) {
@@ -1239,16 +1769,18 @@ option_bind_command(int argc, const char *argv[])
 
        request = get_request(argv[2]);
        if (request == REQ_NONE) {
-               const char *obsolete[] = { "cherry-pick" };
-               size_t namelen = strlen(argv[2]);
-               int i;
-
-               for (i = 0; i < ARRAY_SIZE(obsolete); i++) {
-                       if (namelen == strlen(obsolete[i]) &&
-                           !string_enum_compare(obsolete[i], argv[2], namelen)) {
-                               config_msg = "Obsolete request name";
-                               return ERR;
-                       }
+               static const struct enum_map obsolete[] = {
+                       ENUM_MAP("cherry-pick",         REQ_NONE),
+                       ENUM_MAP("screen-resize",       REQ_NONE),
+                       ENUM_MAP("tree-parent",         REQ_PARENT),
+               };
+               int alias;
+
+               if (map_enum(&alias, obsolete, argv[2])) {
+                       if (alias != REQ_NONE)
+                               add_keybinding(keymap, alias, key);
+                       config_msg = "Obsolete request name";
+                       return ERR;
                }
        }
        if (request == REQ_NONE && *argv[2]++ == '!')
@@ -1267,21 +1799,11 @@ static int
 set_option(const char *opt, char *value)
 {
        const char *argv[SIZEOF_ARG];
-       int valuelen;
        int argc = 0;
 
-       /* Tokenize */
-       while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
-               argv[argc++] = value;
-               value += valuelen;
-
-               /* Nothing more to tokenize or last available token. */
-               if (!*value || argc >= ARRAY_SIZE(argv))
-                       break;
-
-               *value++ = 0;
-               while (isspace(*value))
-                       value++;
+       if (!argv_from_string(argv, &argc, value)) {
+               config_msg = "Too many option arguments";
+               return ERR;
        }
 
        if (!strcmp(opt, "color"))
@@ -1328,8 +1850,8 @@ read_option(char *opt, size_t optlen, char *value, size_t valuelen)
        }
 
        if (status == ERR) {
-               fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
-                       config_lineno, (int) optlen, opt, config_msg);
+               warn("Error on line %d, near '%.*s': %s",
+                    config_lineno, (int) optlen, opt, config_msg);
                config_errors = TRUE;
        }
 
@@ -1340,19 +1862,18 @@ read_option(char *opt, size_t optlen, char *value, size_t valuelen)
 static void
 load_option_file(const char *path)
 {
-       FILE *file;
+       struct io io = {};
 
-       /* It's ok that the file doesn't exist. */
-       file = fopen(path, "r");
-       if (!file)
+       /* It's OK that the file doesn't exist. */
+       if (!io_open(&io, "%s", path))
                return;
 
        config_lineno = 0;
        config_errors = FALSE;
 
-       if (read_properties(file, " \t", read_option) == ERR ||
+       if (io_load(&io, " \t", read_option) == ERR ||
            config_errors == TRUE)
-               fprintf(stderr, "Errors while loading %s.\n", path);
+               warn("Errors while loading %s.", path);
 }
 
 static int
@@ -1365,11 +1886,8 @@ load_options(void)
 
        add_builtin_run_requests();
 
-       if (!tigrc_system) {
-               if (!string_format(buf, "%s/tigrc", SYSCONFDIR))
-                       return ERR;
-               tigrc_system = buf;
-       }
+       if (!tigrc_system)
+               tigrc_system = SYSCONFDIR "/tigrc";
        load_option_file(tigrc_system);
 
        if (!tigrc_user) {
@@ -1394,9 +1912,6 @@ struct view_ops;
 static struct view *display[2];
 static unsigned int current_view;
 
-/* Reading from the prompt? */
-static bool input_mode = FALSE;
-
 #define foreach_displayed_view(view, i) \
        for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
 
@@ -1409,7 +1924,6 @@ static char ref_head[SIZEOF_REF]  = "HEAD";
 
 struct view {
        const char *name;       /* View name */
-       const char *cmd_fmt;    /* Default command line format */
        const char *cmd_env;    /* Command line set via environment */
        const char *id;         /* Points to either of ref_{head,commit,blob} */
 
@@ -1418,7 +1932,6 @@ struct view {
        enum keymap keymap;     /* What keymap does this view have */
        bool git_dir;           /* Whether the view requires a git directory. */
 
-       char cmd[SIZEOF_STR];   /* Command buffer */
        char ref[SIZEOF_REF];   /* Hovered commit reference */
        char vid[SIZEOF_REF];   /* View ID. Set to id member when updating. */
 
@@ -1428,11 +1941,16 @@ struct view {
 
        /* Navigation */
        unsigned long offset;   /* Offset of the window top */
+       unsigned long yoffset;  /* Offset from the window side. */
        unsigned long lineno;   /* Current line number */
+       unsigned long p_offset; /* Previous offset of the window top */
+       unsigned long p_yoffset;/* Previous offset from the window side */
+       unsigned long p_lineno; /* Previous current line number */
+       bool p_restore;         /* Should the previous position be restored. */
 
        /* Searching */
        char grep[SIZEOF_STR];  /* Search string */
-       regex_t *regex;         /* Pre-compiled regex */
+       regex_t *regex;         /* Pre-compiled regexp */
 
        /* If non-NULL, points to the view that opened this view. If this view
         * is closed tig will switch back to the parent view. */
@@ -1441,23 +1959,26 @@ struct view {
        /* Buffering */
        size_t lines;           /* Total number of lines */
        struct line *line;      /* Line index */
-       size_t line_alloc;      /* Total number of allocated lines */
-       size_t line_size;       /* Total number of used lines */
        unsigned int digits;    /* Number of digits in the lines member. */
 
        /* Drawing */
        struct line *curline;   /* Line currently being drawn. */
        enum line_type curtype; /* Attribute currently used for drawing. */
        unsigned long col;      /* Column when drawing. */
+       bool has_scrolled;      /* View was scrolled. */
 
        /* Loading */
-       FILE *pipe;
+       struct io io;
+       struct io *pipe;
        time_t start_time;
+       time_t update_secs;
 };
 
 struct view_ops {
        /* What type of content being displayed. Used in the title bar. */
        const char *type;
+       /* Default command arguments. */
+       const char **argv;
        /* Open and reads in all view content. */
        bool (*open)(struct view *view);
        /* Read one line; updates view->line. */
@@ -1466,14 +1987,17 @@ struct view_ops {
        bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
        /* Depending on view handle a special requests. */
        enum request (*request)(struct view *view, enum request request, struct line *line);
-       /* Search for regex in a line. */
+       /* Search for regexp in a line. */
        bool (*grep)(struct view *view, struct line *line);
        /* Select line */
        void (*select)(struct view *view, struct line *line);
+       /* Prepare view for loading */
+       bool (*prepare)(struct view *view);
 };
 
 static struct view_ops blame_ops;
 static struct view_ops blob_ops;
+static struct view_ops diff_ops;
 static struct view_ops help_ops;
 static struct view_ops log_ops;
 static struct view_ops main_ops;
@@ -1481,21 +2005,23 @@ static struct view_ops pager_ops;
 static struct view_ops stage_ops;
 static struct view_ops status_ops;
 static struct view_ops tree_ops;
+static struct view_ops branch_ops;
 
-#define VIEW_STR(name, cmd, env, ref, ops, map, git) \
-       { name, cmd, #env, ref, ops, map, git }
+#define VIEW_STR(name, env, ref, ops, map, git) \
+       { name, #env, ref, ops, map, git }
 
 #define VIEW_(id, name, ops, git, ref) \
-       VIEW_STR(name, TIG_##id##_CMD,  TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
+       VIEW_STR(name, TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
 
 
 static struct view views[] = {
        VIEW_(MAIN,   "main",   &main_ops,   TRUE,  ref_head),
-       VIEW_(DIFF,   "diff",   &pager_ops,  TRUE,  ref_commit),
+       VIEW_(DIFF,   "diff",   &diff_ops,   TRUE,  ref_commit),
        VIEW_(LOG,    "log",    &log_ops,    TRUE,  ref_head),
        VIEW_(TREE,   "tree",   &tree_ops,   TRUE,  ref_commit),
        VIEW_(BLOB,   "blob",   &blob_ops,   TRUE,  ref_blob),
        VIEW_(BLAME,  "blame",  &blame_ops,  TRUE,  ref_commit),
+       VIEW_(BRANCH, "branch", &branch_ops, TRUE,  ref_head),
        VIEW_(HELP,   "help",   &help_ops,   FALSE, ""),
        VIEW_(PAGER,  "pager",  &pager_ops,  FALSE, "stdin"),
        VIEW_(STATUS, "status", &status_ops, TRUE,  ""),
@@ -1516,7 +2042,7 @@ enum line_graphic {
        LINE_GRAPHIC_VLINE
 };
 
-static int line_graphics[] = {
+static chtype line_graphics[] = {
        /* LINE_GRAPHIC_VLINE: */ '|'
 };
 
@@ -1537,12 +2063,13 @@ draw_chars(struct view *view, enum line_type type, const char *string,
        int len = 0;
        int col = 0;
        int trimmed = FALSE;
+       size_t skip = view->yoffset > view->col ? view->yoffset - view->col : 0;
 
        if (max_len <= 0)
                return 0;
 
        if (opt_utf8) {
-               len = utf8_length(string, &col, max_len, &trimmed, use_tilde);
+               len = utf8_length(&string, skip, &col, max_len, &trimmed, use_tilde);
        } else {
                col = len = strlen(string);
                if (len > max_len) {
@@ -1555,7 +2082,8 @@ draw_chars(struct view *view, enum line_type type, const char *string,
        }
 
        set_view_attr(view, type);
-       waddnstr(view->win, string, len);
+       if (len > 0)
+               waddnstr(view->win, string, len);
        if (trimmed && use_tilde) {
                set_view_attr(view, LINE_DELIMITER);
                waddch(view->win, '~');
@@ -1576,63 +2104,25 @@ draw_space(struct view *view, enum line_type type, int max, int spaces)
        while (spaces > 0) {
                int len = MIN(spaces, sizeof(space) - 1);
 
-               col += draw_chars(view, type, space, spaces, FALSE);
+               col += draw_chars(view, type, space, len, FALSE);
                spaces -= len;
        }
 
        return col;
 }
 
-static bool
-draw_lineno(struct view *view, unsigned int lineno)
-{
-       char number[10];
-       int digits3 = view->digits < 3 ? 3 : view->digits;
-       int max_number = MIN(digits3, STRING_SIZE(number));
-       int max = view->width - view->col;
-       int col;
-
-       if (max < max_number)
-               max_number = max;
-
-       lineno += view->offset + 1;
-       if (lineno == 1 || (lineno % opt_num_interval) == 0) {
-               static char fmt[] = "%1ld";
-
-               if (view->digits <= 9)
-                       fmt[1] = '0' + digits3;
-
-               if (!string_format(number, fmt, lineno))
-                       number[0] = 0;
-               col = draw_chars(view, LINE_LINE_NUMBER, number, max_number, TRUE);
-       } else {
-               col = draw_space(view, LINE_LINE_NUMBER, max_number, max_number);
-       }
-
-       if (col < max) {
-               set_view_attr(view, LINE_DEFAULT);
-               waddch(view->win, line_graphics[LINE_GRAPHIC_VLINE]);
-               col++;
-       }
-
-       if (col < max)
-               col += draw_space(view, LINE_DEFAULT, max - col, 1);
-       view->col += col;
-
-       return view->width - view->col <= 0;
-}
-
 static bool
 draw_text(struct view *view, enum line_type type, const char *string, bool trim)
 {
-       view->col += draw_chars(view, type, string, view->width - view->col, trim);
-       return view->width - view->col <= 0;
+       view->col += draw_chars(view, type, string, view->width + view->yoffset - view->col, trim);
+       return view->width + view->yoffset <= view->col;
 }
 
 static bool
 draw_graphic(struct view *view, enum line_type type, chtype graphic[], size_t size)
 {
-       int max = view->width - view->col;
+       size_t skip = view->yoffset > view->col ? view->yoffset - view->col : 0;
+       int max = view->width + view->yoffset - view->col;
        int i;
 
        if (max < size)
@@ -1641,22 +2131,21 @@ draw_graphic(struct view *view, enum line_type type, chtype graphic[], size_t si
        set_view_attr(view, type);
        /* Using waddch() instead of waddnstr() ensures that
         * they'll be rendered correctly for the cursor line. */
-       for (i = 0; i < size; i++)
+       for (i = skip; i < size; i++)
                waddch(view->win, graphic[i]);
 
        view->col += size;
-       if (size < max) {
+       if (size < max && skip <= size)
                waddch(view->win, ' ');
-               view->col++;
-       }
+       view->col++;
 
-       return view->width - view->col <= 0;
+       return view->width + view->yoffset <= view->col;
 }
 
 static bool
 draw_field(struct view *view, enum line_type type, const char *text, int len, bool trim)
 {
-       int max = MIN(view->width - view->col, len);
+       int max = MIN(view->width + view->yoffset - view->col, len);
        int col;
 
        if (text)
@@ -1664,22 +2153,88 @@ draw_field(struct view *view, enum line_type type, const char *text, int len, bo
        else
                col = draw_space(view, type, max - 1, max - 1);
 
-       view->col += col + draw_space(view, LINE_DEFAULT, max - col, max - col);
-       return view->width - view->col <= 0;
+       view->col += col;
+       view->col += draw_space(view, LINE_DEFAULT, max - col, max - col);
+       return view->width + view->yoffset <= view->col;
+}
+
+static bool
+draw_date(struct view *view, time_t *time)
+{
+       const char *date = time ? mkdate(time) : "";
+       int cols = opt_date == DATE_SHORT ? DATE_SHORT_COLS : DATE_COLS;
+
+       return draw_field(view, LINE_DATE, date, cols, FALSE);
+}
+
+static bool
+draw_author(struct view *view, const char *author)
+{
+       bool trim = opt_author_cols == 0 || opt_author_cols > 5 || !author;
+
+       if (!trim) {
+               static char initials[10];
+               size_t pos;
+
+#define is_initial_sep(c) (isspace(c) || ispunct(c) || (c) == '@')
+
+               memset(initials, 0, sizeof(initials));
+               for (pos = 0; *author && pos < opt_author_cols - 1; author++, pos++) {
+                       while (is_initial_sep(*author))
+                               author++;
+                       strncpy(&initials[pos], author, sizeof(initials) - 1 - pos);
+                       while (*author && !is_initial_sep(author[1]))
+                               author++;
+               }
+
+               author = initials;
+       }
+
+       return draw_field(view, LINE_AUTHOR, author, opt_author_cols, trim);
+}
+
+static bool
+draw_mode(struct view *view, mode_t mode)
+{
+       const char *str;
+
+       if (S_ISDIR(mode))
+               str = "drwxr-xr-x";
+       else if (S_ISLNK(mode))
+               str = "lrwxrwxrwx";
+       else if (S_ISGITLINK(mode))
+               str = "m---------";
+       else if (S_ISREG(mode) && mode & S_IXUSR)
+               str = "-rwxr-xr-x";
+       else if (S_ISREG(mode))
+               str = "-rw-r--r--";
+       else
+               str = "----------";
+
+       return draw_field(view, LINE_MODE, str, STRING_SIZE("-rw-r--r-- "), FALSE);
 }
 
 static bool
-draw_date(struct view *view, struct tm *time)
+draw_lineno(struct view *view, unsigned int lineno)
 {
-       char buf[DATE_COLS];
-       char *date;
-       int timelen = 0;
+       char number[10];
+       int digits3 = view->digits < 3 ? 3 : view->digits;
+       int max = MIN(view->width + view->yoffset - view->col, digits3);
+       char *text = NULL;
 
-       if (time)
-               timelen = strftime(buf, sizeof(buf), DATE_FORMAT, time);
-       date = timelen ? buf : NULL;
+       lineno += view->offset + 1;
+       if (lineno == 1 || (lineno % opt_num_interval) == 0) {
+               static char fmt[] = "%1ld";
 
-       return draw_field(view, LINE_DATE, date, DATE_COLS, FALSE);
+               fmt[1] = '0' + (view->digits <= 9 ? digits3 : 1);
+               if (string_format(number, fmt, lineno))
+                       text = number;
+       }
+       if (text)
+               view->col += draw_chars(view, LINE_LINE_NUMBER, text, max, TRUE);
+       else
+               view->col += draw_space(view, LINE_LINE_NUMBER, max, digits3);
+       return draw_graphic(view, LINE_DEFAULT, &line_graphics[LINE_GRAPHIC_VLINE], 1);
 }
 
 static bool
@@ -1687,7 +2242,6 @@ draw_view_line(struct view *view, unsigned int lineno)
 {
        struct line *line;
        bool selected = (view->offset + lineno == view->lineno);
-       bool draw_ok;
 
        assert(view_is_displayed(view));
 
@@ -1697,24 +2251,21 @@ draw_view_line(struct view *view, unsigned int lineno)
        line = &view->line[view->offset + lineno];
 
        wmove(view->win, lineno, 0);
+       if (line->cleareol)
+               wclrtoeol(view->win);
        view->col = 0;
        view->curline = line;
        view->curtype = LINE_NONE;
        line->selected = FALSE;
+       line->dirty = line->cleareol = 0;
 
        if (selected) {
                set_view_attr(view, LINE_CURSOR);
                line->selected = TRUE;
                view->ops->select(view, line);
-       } else if (line->selected) {
-               wclrtoeol(view->win);
        }
 
-       scrollok(view->win, FALSE);
-       draw_ok = view->ops->draw(view, line, lineno);
-       scrollok(view->win, TRUE);
-
-       return draw_ok;
+       return view->ops->draw(view, line, lineno);
 }
 
 static void
@@ -1724,11 +2275,10 @@ redraw_view_dirty(struct view *view)
        int lineno;
 
        for (lineno = 0; lineno < view->height; lineno++) {
-               struct line *line = &view->line[view->offset + lineno];
-
-               if (!line->dirty)
+               if (view->offset + lineno >= view->lines)
+                       break;
+               if (!view->line[view->offset + lineno].dirty)
                        continue;
-               line->dirty = 0;
                dirty = TRUE;
                if (!draw_view_line(view, lineno))
                        break;
@@ -1736,11 +2286,7 @@ redraw_view_dirty(struct view *view)
 
        if (!dirty)
                return;
-       redrawwin(view->win);
-       if (input_mode)
-               wnoutrefresh(view->win);
-       else
-               wrefresh(view->win);
+       wnoutrefresh(view->win);
 }
 
 static void
@@ -1753,17 +2299,13 @@ redraw_view_from(struct view *view, int lineno)
                        break;
        }
 
-       redrawwin(view->win);
-       if (input_mode)
-               wnoutrefresh(view->win);
-       else
-               wrefresh(view->win);
+       wnoutrefresh(view->win);
 }
 
 static void
 redraw_view(struct view *view)
 {
-       wclear(view->win);
+       werase(view->win);
        redraw_view_from(view, 0);
 }
 
@@ -1777,25 +2319,26 @@ update_view_title(struct view *view)
 
        assert(view_is_displayed(view));
 
-       if (view != VIEW(REQ_VIEW_STATUS) && (view->lines || view->pipe)) {
+       if (view != VIEW(REQ_VIEW_STATUS) && view->lines) {
                unsigned int view_lines = view->offset + view->height;
                unsigned int lines = view->lines
                                   ? MIN(view_lines, view->lines) * 100 / view->lines
                                   : 0;
 
-               string_format_from(state, &statelen, "- %s %d of %d (%d%%)",
+               string_format_from(state, &statelen, " - %s %d of %d (%d%%)",
                                   view->ops->type,
                                   view->lineno + 1,
                                   view->lines,
                                   lines);
 
-               if (view->pipe) {
-                       time_t secs = time(NULL) - view->start_time;
+       }
 
-                       /* Three git seconds are a long time ... */
-                       if (secs > 2)
-                               string_format_from(state, &statelen, " %lds", secs);
-               }
+       if (view->pipe) {
+               time_t secs = time(NULL) - view->start_time;
+
+               /* Three git seconds are a long time ... */
+               if (secs > 2)
+                       string_format_from(state, &statelen, " loading %lds", secs);
        }
 
        string_format_from(buf, &bufpos, "[%s]", view->name);
@@ -1809,7 +2352,7 @@ update_view_title(struct view *view)
        }
 
        if (statelen && bufpos < view->width) {
-               string_format_from(buf, &bufpos, " %s", state);
+               string_format_from(buf, &bufpos, "%s", state);
        }
 
        if (view == display[current_view])
@@ -1819,12 +2362,16 @@ update_view_title(struct view *view)
 
        mvwaddnstr(view->title, 0, 0, buf, bufpos);
        wclrtoeol(view->title);
-       wmove(view->title, 0, view->width - 1);
+       wnoutrefresh(view->title);
+}
 
-       if (input_mode)
-               wnoutrefresh(view->title);
-       else
-               wrefresh(view->title);
+static int
+apply_step(double step, int value)
+{
+       if (step >= 1)
+               return (int) step;
+       value *= step + 0.01;
+       return value ? value : 1;
 }
 
 static void
@@ -1844,7 +2391,9 @@ resize_display(void)
        if (view != base) {
                /* Horizontal split. */
                view->width   = base->width;
-               view->height  = SCALE_SPLIT_VIEW(base->height);
+               view->height  = apply_step(opt_scale_split_view, base->height);
+               view->height  = MAX(view->height, MIN_VIEW_HEIGHT);
+               view->height  = MIN(view->height, base->height - MIN_VIEW_HEIGHT);
                base->height -= view->height;
 
                /* Make room for the title bar. */
@@ -1862,7 +2411,7 @@ resize_display(void)
                        if (!view->win)
                                die("Failed to create %s view", view->name);
 
-                       scrollok(view->win, TRUE);
+                       scrollok(view->win, FALSE);
 
                        view->title = newwin(1, 0, offset + view->height, 0);
                        if (!view->title)
@@ -1879,34 +2428,103 @@ resize_display(void)
 }
 
 static void
-redraw_display(void)
+redraw_display(bool clear)
 {
        struct view *view;
        int i;
 
        foreach_displayed_view (view, i) {
+               if (clear)
+                       wclear(view->win);
                redraw_view(view);
                update_view_title(view);
        }
 }
 
 static void
-update_display_cursor(struct view *view)
+toggle_date_option(enum date *date)
 {
-       /* Move the cursor to the right-most column of the cursor line.
-        *
-        * XXX: This could turn out to be a bit expensive, but it ensures that
-        * the cursor does not jump around. */
-       if (view->lines) {
-               wmove(view->win, view->lineno - view->offset, view->width - 1);
-               wrefresh(view->win);
+       static const char *help[] = {
+               "no",
+               "default",
+               "relative",
+               "short"
+       };
+
+       opt_date = (opt_date + 1) % ARRAY_SIZE(help);
+       redraw_display(FALSE);
+       report("Displaying %s dates", help[opt_date]);
+}
+
+static void
+toggle_view_option(bool *option, const char *help)
+{
+       *option = !*option;
+       redraw_display(FALSE);
+       report("%sabling %s", *option ? "En" : "Dis", help);
+}
+
+static void
+open_option_menu(void)
+{
+       const struct menu_item menu[] = {
+               { '.', "line numbers", &opt_line_number },
+               { 'D', "date display", &opt_date },
+               { 'A', "author display", &opt_author },
+               { 'g', "revision graph display", &opt_rev_graph },
+               { 'F', "reference display", &opt_show_refs },
+               { 0 }
+       };
+       int selected = 0;
+
+       if (prompt_menu("Toggle option", menu, &selected)) {
+               if (menu[selected].data == &opt_date)
+                       toggle_date_option(menu[selected].data);
+               else
+                       toggle_view_option(menu[selected].data, menu[selected].text);
        }
 }
 
+static void
+maximize_view(struct view *view)
+{
+       memset(display, 0, sizeof(display));
+       current_view = 0;
+       display[current_view] = view;
+       resize_display();
+       redraw_display(FALSE);
+       report("");
+}
+
+
 /*
  * Navigation
  */
 
+static bool
+goto_view_line(struct view *view, unsigned long offset, unsigned long lineno)
+{
+       if (lineno >= view->lines)
+               lineno = view->lines > 0 ? view->lines - 1 : 0;
+
+       if (offset > lineno || offset + view->height <= lineno) {
+               unsigned long half = view->height / 2;
+
+               if (lineno > half)
+                       offset = lineno - half;
+               else
+                       offset = 0;
+       }
+
+       if (offset != view->offset || lineno != view->lineno) {
+               view->offset = offset;
+               view->lineno = lineno;
+               return TRUE;
+       }
+
+       return FALSE;
+}
+
 /* Scrolling backend */
 static void
 do_scroll_view(struct view *view, int lines)
@@ -1938,19 +2556,19 @@ do_scroll_view(struct view *view, int lines)
                int line = lines > 0 ? view->height - lines : 0;
                int end = line + ABS(lines);
 
+               scrollok(view->win, TRUE);
                wscrl(view->win, lines);
+               scrollok(view->win, FALSE);
 
-               for (; line < end; line++) {
-                       if (!draw_view_line(view, line))
-                               break;
-               }
+               while (line < end && draw_view_line(view, line))
+                       line++;
 
                if (redraw_current_line)
                        draw_view_line(view, view->lineno - view->offset);
+               wnoutrefresh(view->win);
        }
 
-       redrawwin(view->win);
-       wrefresh(view->win);
+       view->has_scrolled = TRUE;
        report("");
 }
 
@@ -1963,6 +2581,23 @@ scroll_view(struct view *view, enum request request)
        assert(view_is_displayed(view));
 
        switch (request) {
+       case REQ_SCROLL_LEFT:
+               if (view->yoffset == 0) {
+                       report("Cannot scroll beyond the first column");
+                       return;
+               }
+               if (view->yoffset <= apply_step(opt_hscroll, view->width))
+                       view->yoffset = 0;
+               else
+                       view->yoffset -= apply_step(opt_hscroll, view->width);
+               redraw_view_from(view, 0);
+               report("");
+               return;
+       case REQ_SCROLL_RIGHT:
+               view->yoffset += apply_step(opt_hscroll, view->width);
+               redraw_view(view);
+               report("");
+               return;
        case REQ_SCROLL_PAGE_DOWN:
                lines = view->height;
        case REQ_SCROLL_LINE_DOWN:
@@ -2083,8 +2718,7 @@ move_view(struct view *view, enum request request)
        /* Draw the current line */
        draw_view_line(view, view->lineno - view->offset);
 
-       redrawwin(view->win);
-       wrefresh(view->win);
+       wnoutrefresh(view->win);
        report("");
 }
 
@@ -2096,31 +2730,37 @@ move_view(struct view *view, enum request request)
 static void search_view(struct view *view, enum request request);
 
 static bool
-find_next_line(struct view *view, unsigned long lineno, struct line *line)
+grep_text(struct view *view, const char *text[])
 {
-       assert(view_is_displayed(view));
-
-       if (!view->ops->grep(view, line))
-               return FALSE;
-
-       if (lineno - view->offset >= view->height) {
-               view->offset = lineno;
-               view->lineno = lineno;
-               redraw_view(view);
+       regmatch_t pmatch;
+       size_t i;
 
-       } else {
-               unsigned long old_lineno = view->lineno - view->offset;
+       for (i = 0; text[i]; i++)
+               if (*text[i] &&
+                   regexec(view->regex, text[i], 1, &pmatch, 0) != REG_NOMATCH)
+                       return TRUE;
+       return FALSE;
+}
 
-               view->lineno = lineno;
-               draw_view_line(view, old_lineno);
+static void
+select_view_line(struct view *view, unsigned long lineno)
+{
+       unsigned long old_lineno = view->lineno;
+       unsigned long old_offset = view->offset;
 
-               draw_view_line(view, view->lineno - view->offset);
-               redrawwin(view->win);
-               wrefresh(view->win);
+       if (goto_view_line(view, view->offset, lineno)) {
+               if (view_is_displayed(view)) {
+                       if (old_offset != view->offset) {
+                               redraw_view(view);
+                       } else {
+                               draw_view_line(view, old_lineno - view->offset);
+                               draw_view_line(view, view->lineno - view->offset);
+                               wnoutrefresh(view->win);
+                       }
+               } else {
+                       view->ops->select(view, &view->line[view->lineno]);
+               }
        }
-
-       report("Line %ld matches '%s'", lineno + 1, view->grep);
-       return TRUE;
 }
 
 static void
@@ -2158,10 +2798,11 @@ find_next(struct view *view, enum request request)
        /* Note, lineno is unsigned long so will wrap around in which case it
         * will become bigger than view->lines. */
        for (; lineno < view->lines; lineno += direction) {
-               struct line *line = &view->line[lineno];
-
-               if (find_next_line(view, lineno, line))
+               if (view->ops->grep(view, &view->line[lineno])) {
+                       select_view_line(view, lineno);
+                       report("Line %ld matches '%s'", lineno + 1, view->grep);
                        return;
+               }
        }
 
        report("No match found for '%s'", view->grep);
@@ -2185,36 +2826,135 @@ search_view(struct view *view, enum request request)
        if (regex_err != 0) {
                char buf[SIZEOF_STR] = "unknown error";
 
-               regerror(regex_err, view->regex, buf, sizeof(buf));
-               report("Search failed: %s", buf);
-               return;
+               regerror(regex_err, view->regex, buf, sizeof(buf));
+               report("Search failed: %s", buf);
+               return;
+       }
+
+       string_copy(view->grep, opt_search);
+
+       find_next(view, request);
+}
+
+/*
+ * Incremental updating
+ */
+
+static void
+reset_view(struct view *view)
+{
+       int i;
+
+       for (i = 0; i < view->lines; i++)
+               free(view->line[i].data);
+       free(view->line);
+
+       view->p_offset = view->offset;
+       view->p_yoffset = view->yoffset;
+       view->p_lineno = view->lineno;
+
+       view->line = NULL;
+       view->offset = 0;
+       view->yoffset = 0;
+       view->lines  = 0;
+       view->lineno = 0;
+       view->vid[0] = 0;
+       view->update_secs = 0;
+}
+
+static void
+free_argv(const char *argv[])
+{
+       int argc;
+
+       for (argc = 0; argv[argc]; argc++)
+               free((void *) argv[argc]);
+}
+
+static bool
+format_argv(const char *dst_argv[], const char *src_argv[], enum format_flags flags)
+{
+       char buf[SIZEOF_STR];
+       int argc;
+       bool noreplace = flags == FORMAT_NONE;
+
+       free_argv(dst_argv);
+
+       for (argc = 0; src_argv[argc]; argc++) {
+               const char *arg = src_argv[argc];
+               size_t bufpos = 0;
+
+               while (arg) {
+                       char *next = strstr(arg, "%(");
+                       int len = next - arg;
+                       const char *value;
+
+                       if (!next || noreplace) {
+                               if (flags == FORMAT_DASH && !strcmp(arg, "--"))
+                                       noreplace = TRUE;
+                               len = strlen(arg);
+                               value = "";
+
+                       } else if (!prefixcmp(next, "%(directory)")) {
+                               value = opt_path;
+
+                       } else if (!prefixcmp(next, "%(file)")) {
+                               value = opt_file;
+
+                       } else if (!prefixcmp(next, "%(ref)")) {
+                               value = *opt_ref ? opt_ref : "HEAD";
+
+                       } else if (!prefixcmp(next, "%(head)")) {
+                               value = ref_head;
+
+                       } else if (!prefixcmp(next, "%(commit)")) {
+                               value = ref_commit;
+
+                       } else if (!prefixcmp(next, "%(blob)")) {
+                               value = ref_blob;
+
+                       } else {
+                               report("Unknown replacement: `%s`", next);
+                               return FALSE;
+                       }
+
+                       if (!string_format_from(buf, &bufpos, "%.*s%s", len, arg, value))
+                               return FALSE;
+
+                       arg = next && !noreplace ? strchr(next, ')') + 1 : NULL;
+               }
+
+               dst_argv[argc] = strdup(buf);
+               if (!dst_argv[argc])
+                       break;
        }
 
-       string_copy(view->grep, opt_search);
+       dst_argv[argc] = NULL;
 
-       find_next(view, request);
+       return src_argv[argc] == NULL;
 }
 
-/*
- * Incremental updating
- */
-
-static void
-reset_view(struct view *view)
+static bool
+restore_view_position(struct view *view)
 {
-       int i;
+       if (!view->p_restore || (view->pipe && view->lines <= view->p_lineno))
+               return FALSE;
 
-       for (i = 0; i < view->lines; i++)
-               free(view->line[i].data);
-       free(view->line);
+       /* Changing the view position cancels the restoring. */
+       /* FIXME: Changing back to the first line is not detected. */
+       if (view->offset != 0 || view->lineno != 0) {
+               view->p_restore = FALSE;
+               return FALSE;
+       }
 
-       view->line = NULL;
-       view->offset = 0;
-       view->lines  = 0;
-       view->lineno = 0;
-       view->line_size = 0;
-       view->line_alloc = 0;
-       view->vid[0] = 0;
+       if (goto_view_line(view, view->p_offset, view->p_lineno) &&
+           view_is_displayed(view))
+               werase(view->win);
+
+       view->yoffset = view->p_yoffset;
+       view->p_restore = FALSE;
+
+       return TRUE;
 }
 
 static void
@@ -2226,45 +2966,52 @@ end_update(struct view *view, bool force)
                if (!force)
                        return;
        set_nonblocking_input(FALSE);
-       if (view->pipe == stdin)
-               fclose(view->pipe);
-       else
-               pclose(view->pipe);
+       if (force)
+               kill_io(view->pipe);
+       done_io(view->pipe);
        view->pipe = NULL;
 }
 
-static bool
-begin_update(struct view *view, bool refresh)
+static void
+setup_update(struct view *view, const char *vid)
 {
-       if (opt_cmd[0]) {
-               string_copy(view->cmd, opt_cmd);
-               opt_cmd[0] = 0;
-               /* When running random commands, initially show the
-                * command in the title. However, it maybe later be
-                * overwritten if a commit line is selected. */
-               if (view == VIEW(REQ_VIEW_PAGER))
-                       string_copy(view->ref, view->cmd);
-               else
-                       view->ref[0] = 0;
-
-       } else if (view == VIEW(REQ_VIEW_TREE)) {
-               const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
-               char path[SIZEOF_STR];
+       set_nonblocking_input(TRUE);
+       reset_view(view);
+       string_copy_rev(view->vid, vid);
+       view->pipe = &view->io;
+       view->start_time = time(NULL);
+}
 
-               if (strcmp(view->vid, view->id))
-                       opt_path[0] = path[0] = 0;
-               else if (sq_quote(path, 0, opt_path) >= sizeof(path))
-                       return FALSE;
+static bool
+prepare_update(struct view *view, const char *argv[], const char *dir,
+              enum format_flags flags)
+{
+       if (view->pipe)
+               end_update(view, TRUE);
+       return init_io_rd(&view->io, argv, dir, flags);
+}
 
-               if (!string_format(view->cmd, format, view->id, path))
-                       return FALSE;
+static bool
+prepare_update_file(struct view *view, const char *name)
+{
+       if (view->pipe)
+               end_update(view, TRUE);
+       return io_open(&view->io, "%s", name);
+}
 
-       } else if (!refresh) {
-               const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
-               const char *id = view->id;
+static bool
+begin_update(struct view *view, bool refresh)
+{
+       if (view->pipe)
+               end_update(view, TRUE);
 
-               if (!string_format(view->cmd, format, id, id, id, id, id))
+       if (!refresh) {
+               if (view->ops->prepare) {
+                       if (!view->ops->prepare(view))
+                               return FALSE;
+               } else if (!init_io_rd(&view->io, view->ops->argv, NULL, FORMAT_ALL)) {
                        return FALSE;
+               }
 
                /* Put the current ref_* value to the view title ref
                 * member. This is needed by the blob view. Most other
@@ -2273,89 +3020,45 @@ begin_update(struct view *view, bool refresh)
                string_copy_rev(view->ref, view->id);
        }
 
-       /* Special case for the pager view. */
-       if (opt_pipe) {
-               view->pipe = opt_pipe;
-               opt_pipe = NULL;
-       } else {
-               view->pipe = popen(view->cmd, "r");
-       }
-
-       if (!view->pipe)
+       if (!start_io(&view->io))
                return FALSE;
 
-       set_nonblocking_input(TRUE);
-       reset_view(view);
-       string_copy_rev(view->vid, view->id);
-
-       view->start_time = time(NULL);
+       setup_update(view, view->id);
 
        return TRUE;
 }
 
-#define ITEM_CHUNK_SIZE 256
-static void *
-realloc_items(void *mem, size_t *size, size_t new_size, size_t item_size)
-{
-       size_t num_chunks = *size / ITEM_CHUNK_SIZE;
-       size_t num_chunks_new = (new_size + ITEM_CHUNK_SIZE - 1) / ITEM_CHUNK_SIZE;
-
-       if (mem == NULL || num_chunks != num_chunks_new) {
-               *size = num_chunks_new * ITEM_CHUNK_SIZE;
-               mem = realloc(mem, *size * item_size);
-       }
-
-       return mem;
-}
-
-static struct line *
-realloc_lines(struct view *view, size_t line_size)
-{
-       size_t alloc = view->line_alloc;
-       struct line *tmp = realloc_items(view->line, &alloc, line_size,
-                                        sizeof(*view->line));
-
-       if (!tmp)
-               return NULL;
-
-       view->line = tmp;
-       view->line_alloc = alloc;
-       view->line_size = line_size;
-       return view->line;
-}
-
 static bool
 update_view(struct view *view)
 {
-       char in_buffer[BUFSIZ];
        char out_buffer[BUFSIZ * 2];
        char *line;
-       /* The number of lines to read. If too low it will cause too much
-        * redrawing (and possible flickering), if too high responsiveness
-        * will suffer. */
-       unsigned long lines = view->height;
-       int redraw_from = -1;
+       /* Clear the view and redraw everything since the tree sorting
+        * might have rearranged things. */
+       bool redraw = view->lines == 0;
+       bool can_read = TRUE;
 
        if (!view->pipe)
                return TRUE;
 
-       /* Only redraw if lines are visible. */
-       if (view->offset + view->height >= view->lines)
-               redraw_from = view->lines - view->offset;
-
-       /* FIXME: This is probably not perfect for backgrounded views. */
-       if (!realloc_lines(view, view->lines + lines))
-               goto alloc_error;
-
-       while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
-               size_t linelen = strlen(line);
+       if (!io_can_read(view->pipe)) {
+               if (view->lines == 0 && view_is_displayed(view)) {
+                       time_t secs = time(NULL) - view->start_time;
 
-               if (linelen)
-                       line[linelen - 1] = 0;
+                       if (secs > 1 && secs > view->update_secs) {
+                               if (view->update_secs == 0)
+                                       redraw_view(view);
+                               update_view_title(view);
+                               view->update_secs = secs;
+                       }
+               }
+               return TRUE;
+       }
 
+       for (; (line = io_get(view->pipe, '\n', can_read)); can_read = FALSE) {
                if (opt_iconv != ICONV_NONE) {
                        ICONV_CONST char *inbuf = line;
-                       size_t inlen = linelen;
+                       size_t inlen = strlen(line) + 1;
 
                        char *outbuf = out_buffer;
                        size_t outlen = sizeof(out_buffer);
@@ -2363,86 +3066,73 @@ update_view(struct view *view)
                        size_t ret;
 
                        ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
-                       if (ret != (size_t) -1) {
+                       if (ret != (size_t) -1)
                                line = out_buffer;
-                               linelen = strlen(out_buffer);
-                       }
                }
 
-               if (!view->ops->read(view, line))
-                       goto alloc_error;
-
-               if (lines-- == 1)
-                       break;
+               if (!view->ops->read(view, line)) {
+                       report("Allocation failure");
+                       end_update(view, TRUE);
+                       return FALSE;
+               }
        }
 
        {
+               unsigned long lines = view->lines;
                int digits;
 
-               lines = view->lines;
                for (digits = 0; lines; digits++)
                        lines /= 10;
 
                /* Keep the displayed view in sync with line number scaling. */
                if (digits != view->digits) {
                        view->digits = digits;
-                       redraw_from = 0;
+                       if (opt_line_number || view == VIEW(REQ_VIEW_BLAME))
+                               redraw = TRUE;
                }
        }
 
-       if (ferror(view->pipe) && errno != 0) {
-               report("Failed to read: %s", strerror(errno));
+       if (io_error(view->pipe)) {
+               report("Failed to read: %s", io_strerror(view->pipe));
                end_update(view, TRUE);
 
-       } else if (feof(view->pipe)) {
+       } else if (io_eof(view->pipe)) {
                report("");
                end_update(view, FALSE);
        }
 
-       if (view == VIEW(REQ_VIEW_TREE)) {
-               /* Clear the view and redraw everything since the tree sorting
-                * might have rearranged things. */
-               redraw_view(view);
-
-       } else if (redraw_from >= 0) {
-               /* If this is an incremental update, redraw the previous line
-                * since for commits some members could have changed when
-                * loading the main view. */
-               if (redraw_from > 0)
-                       redraw_from--;
-
-               /* Since revision graph visualization requires knowledge
-                * about the parent commit, it causes a further one-off
-                * needed to be redrawn for incremental updates. */
-               if (redraw_from > 0 && opt_rev_graph)
-                       redraw_from--;
+       if (restore_view_position(view))
+               redraw = TRUE;
 
-               /* Incrementally draw avoids flickering. */
-               redraw_view_from(view, redraw_from);
-       }
+       if (!view_is_displayed(view))
+               return TRUE;
 
-       if (view == VIEW(REQ_VIEW_BLAME))
+       if (redraw)
+               redraw_view_from(view, 0);
+       else
                redraw_view_dirty(view);
 
        /* Update the title _after_ the redraw so that if the redraw picks up a
         * commit reference in view->ref it'll be available here. */
        update_view_title(view);
        return TRUE;
-
-alloc_error:
-       report("Allocation failure");
-       end_update(view, TRUE);
-       return FALSE;
 }
 
+DEFINE_ALLOCATOR(realloc_lines, struct line, 256)
+
 static struct line *
 add_line_data(struct view *view, void *data, enum line_type type)
 {
-       struct line *line = &view->line[view->lines++];
+       struct line *line;
+
+       if (!realloc_lines(&view->line, view->lines, 1))
+               return NULL;
 
+       line = &view->line[view->lines++];
        memset(line, 0, sizeof(*line));
        line->type = type;
        line->data = data;
+       line->dirty = 1;
 
        return line;
 }
@@ -2455,6 +3145,19 @@ add_line_text(struct view *view, const char *text, enum line_type type)
        return data ? add_line_data(view, data, type) : NULL;
 }
 
+static struct line *
+add_line_format(struct view *view, enum line_type type, const char *fmt, ...)
+{
+       char buf[SIZEOF_STR];
+       va_list args;
+
+       va_start(args, fmt);
+       if (vsnprintf(buf, sizeof(buf), fmt, args) >= sizeof(buf))
+               buf[0] = 0;
+       va_end(args);
+
+       return buf[0] ? add_line_text(view, buf, type) : NULL;
+}
 
 /*
  * View opening
@@ -2463,19 +3166,17 @@ add_line_text(struct view *view, const char *text, enum line_type type)
 enum open_flags {
        OPEN_DEFAULT = 0,       /* Use default view switching. */
        OPEN_SPLIT = 1,         /* Split current view. */
-       OPEN_BACKGROUNDED = 2,  /* Backgrounded. */
        OPEN_RELOAD = 4,        /* Reload view even if it is the current. */
-       OPEN_NOMAXIMIZE = 8,    /* Do not maximize the current view. */
        OPEN_REFRESH = 16,      /* Refresh view using previous command. */
+       OPEN_PREPARED = 32,     /* Open already prepared command. */
 };
 
 static void
 open_view(struct view *prev, enum request request, enum open_flags flags)
 {
-       bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
        bool split = !!(flags & OPEN_SPLIT);
-       bool reload = !!(flags & (OPEN_RELOAD | OPEN_REFRESH));
-       bool nomaximize = !!(flags & (OPEN_NOMAXIMIZE | OPEN_REFRESH));
+       bool reload = !!(flags & (OPEN_RELOAD | OPEN_REFRESH | OPEN_PREPARED));
+       bool nomaximize = !!(flags & OPEN_REFRESH);
        struct view *view = VIEW(request);
        int nviews = displayed_views();
        struct view *base_view = display[0];
@@ -2492,8 +3193,7 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
 
        if (split) {
                display[1] = view;
-               if (!backgrounded)
-                       current_view = 1;
+               current_view = 1;
        } else if (!nomaximize) {
                /* Maximize the current view. */
                memset(display, 0, sizeof(display));
@@ -2501,23 +3201,28 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
                display[current_view] = view;
        }
 
+       /* No parent signals that this is the first loaded view. */
+       if (prev && view != prev) {
+               view->parent = prev;
+       }
+
        /* Resize the view when switching between split- and full-screen,
         * or when switching between two different full-screen views. */
        if (nviews != displayed_views() ||
            (nviews == 1 && base_view != display[0]))
                resize_display();
 
-       if (view->pipe)
-               end_update(view, TRUE);
-
        if (view->ops->open) {
+               if (view->pipe)
+                       end_update(view, TRUE);
                if (!view->ops->open(view)) {
                        report("Failed to load %s view", view->name);
                        return;
                }
+               restore_view_position(view);
 
        } else if ((reload || strcmp(view->vid, view->id)) &&
-                  !begin_update(view, flags & OPEN_REFRESH)) {
+                  !begin_update(view, flags & (OPEN_REFRESH | OPEN_PREPARED))) {
                report("Failed to load %s view", view->name);
                return;
        }
@@ -2532,72 +3237,49 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
        }
 
        if (prev && view != prev) {
-               if (split && !backgrounded) {
+               if (split) {
                        /* "Blur" the previous view. */
                        update_view_title(prev);
                }
-
-               view->parent = prev;
        }
 
        if (view->pipe && view->lines == 0) {
                /* Clear the old view and let the incremental updating refill
                 * the screen. */
                werase(view->win);
+               view->p_restore = flags & (OPEN_RELOAD | OPEN_REFRESH);
                report("");
        } else if (view_is_displayed(view)) {
                redraw_view(view);
                report("");
        }
-
-       /* If the view is backgrounded the above calls to report()
-        * won't redraw the view title. */
-       if (backgrounded)
-               update_view_title(view);
-}
-
-static bool
-run_confirm(const char *cmd, const char *prompt)
-{
-       bool confirmation = prompt_yesno(prompt);
-
-       if (confirmation)
-               system(cmd);
-
-       return confirmation;
 }
 
 static void
-open_external_viewer(const char *cmd)
+open_external_viewer(const char *argv[], const char *dir)
 {
        def_prog_mode();           /* save current tty modes */
        endwin();                  /* restore original tty modes */
-       system(cmd);
+       run_io_fg(argv, dir);
        fprintf(stderr, "Press Enter to continue");
        getc(opt_tty);
        reset_prog_mode();
-       redraw_display();
+       redraw_display(TRUE);
 }
 
 static void
 open_mergetool(const char *file)
 {
-       char cmd[SIZEOF_STR];
-       char file_sq[SIZEOF_STR];
+       const char *mergetool_argv[] = { "git", "mergetool", file, NULL };
 
-       if (sq_quote(file_sq, 0, file) < sizeof(file_sq) &&
-           string_format(cmd, "git mergetool %s", file_sq)) {
-               open_external_viewer(cmd);
-       }
+       open_external_viewer(mergetool_argv, opt_cdup);
 }
 
 static void
 open_editor(bool from_root, const char *file)
 {
-       char cmd[SIZEOF_STR];
-       char file_sq[SIZEOF_STR];
+       const char *editor_argv[] = { "vi", file, NULL };
        const char *editor;
-       char *prefix = from_root ? opt_cdup : "";
 
        editor = getenv("GIT_EDITOR");
        if (!editor && *opt_editor)
@@ -2609,60 +3291,24 @@ open_editor(bool from_root, const char *file)
        if (!editor)
                editor = "vi";
 
-       if (sq_quote(file_sq, 0, file) < sizeof(file_sq) &&
-           string_format(cmd, "%s %s%s", editor, prefix, file_sq)) {
-               open_external_viewer(cmd);
-       }
+       editor_argv[0] = editor;
+       open_external_viewer(editor_argv, from_root ? opt_cdup : NULL);
 }
 
 static void
 open_run_request(enum request request)
 {
        struct run_request *req = get_run_request(request);
-       char buf[SIZEOF_STR * 2];
-       size_t bufpos;
-       char *cmd;
+       const char *argv[ARRAY_SIZE(req->argv)] = { NULL };
 
        if (!req) {
                report("Unknown run request");
                return;
        }
 
-       bufpos = 0;
-       cmd = req->cmd;
-
-       while (cmd) {
-               char *next = strstr(cmd, "%(");
-               int len = next - cmd;
-               char *value;
-
-               if (!next) {
-                       len = strlen(cmd);
-                       value = "";
-
-               } else if (!strncmp(next, "%(head)", 7)) {
-                       value = ref_head;
-
-               } else if (!strncmp(next, "%(commit)", 9)) {
-                       value = ref_commit;
-
-               } else if (!strncmp(next, "%(blob)", 7)) {
-                       value = ref_blob;
-
-               } else {
-                       report("Unknown replacement in run request: `%s`", req->cmd);
-                       return;
-               }
-
-               if (!string_format_from(buf, &bufpos, "%.*s%s", len, cmd, value))
-                       return;
-
-               if (next)
-                       next = strchr(next, ')') + 1;
-               cmd = next;
-       }
-
-       open_external_viewer(buf);
+       if (format_argv(argv, req->argv, FORMAT_ALL))
+               open_external_viewer(argv, NULL);
+       free_argv(argv);
 }
 
 /*
@@ -2674,10 +3320,8 @@ view_driver(struct view *view, enum request request)
 {
        int i;
 
-       if (request == REQ_NONE) {
-               doupdate();
+       if (request == REQ_NONE)
                return TRUE;
-       }
 
        if (request > REQ_NONE) {
                open_run_request(request);
@@ -2685,6 +3329,7 @@ view_driver(struct view *view, enum request request)
                if (view == VIEW(REQ_VIEW_STATUS) ||
                    view == VIEW(REQ_VIEW_MAIN) ||
                    view == VIEW(REQ_VIEW_LOG) ||
+                   view == VIEW(REQ_VIEW_BRANCH) ||
                    view == VIEW(REQ_VIEW_STAGE))
                        request = REQ_REFRESH;
                else
@@ -2707,6 +3352,8 @@ view_driver(struct view *view, enum request request)
                move_view(view, request);
                break;
 
+       case REQ_SCROLL_LEFT:
+       case REQ_SCROLL_RIGHT:
        case REQ_SCROLL_LINE_DOWN:
        case REQ_SCROLL_LINE_UP:
        case REQ_SCROLL_PAGE_DOWN:
@@ -2717,7 +3364,7 @@ view_driver(struct view *view, enum request request)
        case REQ_VIEW_BLAME:
                if (!opt_file[0]) {
                        report("No file chosen, press %s to open tree view",
-                              get_key(REQ_VIEW_TREE));
+                              get_key(view->keymap, REQ_VIEW_TREE));
                        break;
                }
                open_view(view, request, OPEN_DEFAULT);
@@ -2726,16 +3373,16 @@ view_driver(struct view *view, enum request request)
        case REQ_VIEW_BLOB:
                if (!ref_blob[0]) {
                        report("No file chosen, press %s to open tree view",
-                              get_key(REQ_VIEW_TREE));
+                              get_key(view->keymap, REQ_VIEW_TREE));
                        break;
                }
                open_view(view, request, OPEN_DEFAULT);
                break;
 
        case REQ_VIEW_PAGER:
-               if (!opt_pipe && !VIEW(REQ_VIEW_PAGER)->lines) {
+               if (!VIEW(REQ_VIEW_PAGER)->pipe && !VIEW(REQ_VIEW_PAGER)->lines) {
                        report("No pager content, press %s to run command from prompt",
-                              get_key(REQ_PROMPT));
+                              get_key(view->keymap, REQ_PROMPT));
                        break;
                }
                open_view(view, request, OPEN_DEFAULT);
@@ -2744,7 +3391,7 @@ view_driver(struct view *view, enum request request)
        case REQ_VIEW_STAGE:
                if (!VIEW(REQ_VIEW_STAGE)->lines) {
                        report("No stage content, press %s to open the status view and choose file",
-                              get_key(REQ_VIEW_STATUS));
+                              get_key(view->keymap, REQ_VIEW_STATUS));
                        break;
                }
                open_view(view, request, OPEN_DEFAULT);
@@ -2763,6 +3410,7 @@ view_driver(struct view *view, enum request request)
        case REQ_VIEW_LOG:
        case REQ_VIEW_TREE:
        case REQ_VIEW_HELP:
+       case REQ_VIEW_BRANCH:
                open_view(view, request, OPEN_DEFAULT);
                break;
 
@@ -2777,7 +3425,9 @@ view_driver(struct view *view, enum request request)
                   (view == VIEW(REQ_VIEW_STAGE) &&
                     view->parent == VIEW(REQ_VIEW_STATUS)) ||
                   (view == VIEW(REQ_VIEW_BLOB) &&
-                    view->parent == VIEW(REQ_VIEW_TREE))) {
+                    view->parent == VIEW(REQ_VIEW_TREE)) ||
+                  (view == VIEW(REQ_VIEW_MAIN) &&
+                    view->parent == VIEW(REQ_VIEW_BRANCH))) {
                        int line;
 
                        view = view->parent;
@@ -2816,32 +3466,36 @@ view_driver(struct view *view, enum request request)
 
        case REQ_MAXIMIZE:
                if (displayed_views() == 2)
-                       open_view(view, VIEW_REQ(view), OPEN_DEFAULT);
+                       maximize_view(view);
+               break;
+
+       case REQ_OPTIONS:
+               open_option_menu();
                break;
 
        case REQ_TOGGLE_LINENO:
-               opt_line_number = !opt_line_number;
-               redraw_display();
+               toggle_view_option(&opt_line_number, "line numbers");
                break;
 
        case REQ_TOGGLE_DATE:
-               opt_date = !opt_date;
-               redraw_display();
+               toggle_date_option(&opt_date);
                break;
 
        case REQ_TOGGLE_AUTHOR:
-               opt_author = !opt_author;
-               redraw_display();
+               toggle_view_option(&opt_author, "author display");
                break;
 
        case REQ_TOGGLE_REV_GRAPH:
-               opt_rev_graph = !opt_rev_graph;
-               redraw_display();
+               toggle_view_option(&opt_rev_graph, "revision graph display");
                break;
 
        case REQ_TOGGLE_REFS:
-               opt_show_refs = !opt_show_refs;
-               redraw_display();
+               toggle_view_option(&opt_show_refs, "reference display");
+               break;
+
+       case REQ_TOGGLE_SORT_FIELD:
+       case REQ_TOGGLE_SORT_ORDER:
+               report("Sorting is not yet supported for the %s view", view->name);
                break;
 
        case REQ_SEARCH:
@@ -2854,62 +3508,247 @@ view_driver(struct view *view, enum request request)
                find_next(view, request);
                break;
 
-       case REQ_STOP_LOADING:
-               for (i = 0; i < ARRAY_SIZE(views); i++) {
-                       view = &views[i];
-                       if (view->pipe)
-                               report("Stopped loading the %s view", view->name),
-                       end_update(view, TRUE);
-               }
-               break;
+       case REQ_STOP_LOADING:
+               for (i = 0; i < ARRAY_SIZE(views); i++) {
+                       view = &views[i];
+                       if (view->pipe)
+                               report("Stopped loading the %s view", view->name),
+                       end_update(view, TRUE);
+               }
+               break;
+
+       case REQ_SHOW_VERSION:
+               report("tig-%s (built %s)", TIG_VERSION, __DATE__);
+               return TRUE;
+
+       case REQ_SCREEN_REDRAW:
+               redraw_display(TRUE);
+               break;
+
+       case REQ_EDIT:
+               report("Nothing to edit");
+               break;
+
+       case REQ_ENTER:
+               report("Nothing to enter");
+               break;
+
+       case REQ_VIEW_CLOSE:
+               /* XXX: Mark closed views by letting view->parent point to the
+                * view itself. Parents to closed view should never be
+                * followed. */
+               if (view->parent &&
+                   view->parent->parent != view->parent) {
+                       maximize_view(view->parent);
+                       view->parent = view;
+                       break;
+               }
+               /* Fall-through */
+       case REQ_QUIT:
+               return FALSE;
+
+       default:
+               report("Unknown key, press %s for help",
+                      get_key(view->keymap, REQ_VIEW_HELP));
+               return TRUE;
+       }
+
+       return TRUE;
+}
+
+
+/*
+ * View backend utilities
+ */
+
+enum sort_field {
+       ORDERBY_NAME,
+       ORDERBY_DATE,
+       ORDERBY_AUTHOR,
+};
+
+struct sort_state {
+       const enum sort_field *fields;
+       size_t size, current;
+       bool reverse;
+};
+
+#define SORT_STATE(fields) { fields, ARRAY_SIZE(fields), 0 }
+#define get_sort_field(state) ((state).fields[(state).current])
+#define sort_order(state, result) ((state).reverse ? -(result) : (result))
+
+static void
+sort_view(struct view *view, enum request request, struct sort_state *state,
+         int (*compare)(const void *, const void *))
+{
+       switch (request) {
+       case REQ_TOGGLE_SORT_FIELD:
+               state->current = (state->current + 1) % state->size;
+               break;
+
+       case REQ_TOGGLE_SORT_ORDER:
+               state->reverse = !state->reverse;
+               break;
+       default:
+               die("Not a sort request");
+       }
+
+       qsort(view->line, view->lines, sizeof(*view->line), compare);
+       redraw_view(view);
+}
+
+DEFINE_ALLOCATOR(realloc_authors, const char *, 256)
+
+/* Small author cache to reduce memory consumption. It uses binary
+ * search to lookup or find place to position new entries. No entries
+ * are ever freed. */
+static const char *
+get_author(const char *name)
+{
+       static const char **authors;
+       static size_t authors_size;
+       int from = 0, to = authors_size - 1;
+
+       while (from <= to) {
+               size_t pos = (to + from) / 2;
+               int cmp = strcmp(name, authors[pos]);
+
+               if (!cmp)
+                       return authors[pos];
+
+               if (cmp < 0)
+                       to = pos - 1;
+               else
+                       from = pos + 1;
+       }
+
+       if (!realloc_authors(&authors, authors_size, 1))
+               return NULL;
+       name = strdup(name);
+       if (!name)
+               return NULL;
+
+       memmove(authors + from + 1, authors + from, (authors_size - from) * sizeof(*authors));
+       authors[from] = name;
+       authors_size++;
+
+       return name;
+}
+
+static void
+parse_timezone(time_t *time, const char *zone)
+{
+       long tz;
+
+       tz  = ('0' - zone[1]) * 60 * 60 * 10;
+       tz += ('0' - zone[2]) * 60 * 60;
+       tz += ('0' - zone[3]) * 60;
+       tz += ('0' - zone[4]);
+
+       if (zone[0] == '-')
+               tz = -tz;
+
+       *time -= tz;
+}
+
+/* Parse author lines where the name may be empty:
+ *     author  <email@address.tld> 1138474660 +0100
+ */
+static void
+parse_author_line(char *ident, const char **author, time_t *time)
+{
+       char *nameend = strchr(ident, '<');
+       char *emailend = strchr(ident, '>');
+
+       if (nameend && emailend)
+               *nameend = *emailend = 0;
+       ident = chomp_string(ident);
+       if (!*ident) {
+               if (nameend)
+                       ident = chomp_string(nameend + 1);
+               if (!*ident)
+                       ident = "Unknown";
+       }
+
+       *author = get_author(ident);
 
-       case REQ_SHOW_VERSION:
-               report("tig-%s (built %s)", TIG_VERSION, __DATE__);
-               return TRUE;
+       /* Parse epoch and timezone */
+       if (emailend && emailend[1] == ' ') {
+               char *secs = emailend + 2;
+               char *zone = strchr(secs, ' ');
 
-       case REQ_SCREEN_RESIZE:
-               resize_display();
-               /* Fall-through */
-       case REQ_SCREEN_REDRAW:
-               redraw_display();
-               break;
+               *time = (time_t) atol(secs);
 
-       case REQ_EDIT:
-               report("Nothing to edit");
-               break;
+               if (zone && strlen(zone) == STRING_SIZE(" +0700"))
+                       parse_timezone(time, zone + 1);
+       }
+}
 
-       case REQ_ENTER:
-               report("Nothing to enter");
-               break;
+static bool
+open_commit_parent_menu(char buf[SIZEOF_STR], int *parents)
+{
+       char rev[SIZEOF_REV];
+       const char *revlist_argv[] = {
+               "git", "log", "--no-color", "-1", "--pretty=format:%s", rev, NULL
+       };
+       struct menu_item *items;
+       char text[SIZEOF_STR];
+       bool ok = TRUE;
+       int i;
 
-       case REQ_VIEW_CLOSE:
-               /* XXX: Mark closed views by letting view->parent point to the
-                * view itself. Parents to closed view should never be
-                * followed. */
-               if (view->parent &&
-                   view->parent->parent != view->parent) {
-                       memset(display, 0, sizeof(display));
-                       current_view = 0;
-                       display[current_view] = view->parent;
-                       view->parent = view;
-                       resize_display();
-                       redraw_display();
-                       report("");
+       items = calloc(*parents + 1, sizeof(*items));
+       if (!items)
+               return FALSE;
+
+       for (i = 0; i < *parents; i++) {
+               string_copy_rev(rev, &buf[SIZEOF_REV * i]);
+               if (!run_io_buf(revlist_argv, text, sizeof(text)) ||
+                   !(items[i].text = strdup(text))) {
+                       ok = FALSE;
                        break;
                }
-               /* Fall-through */
-       case REQ_QUIT:
+       }
+
+       if (ok) {
+               *parents = 0;
+               ok = prompt_menu("Select parent", items, parents);
+       }
+       for (i = 0; items[i].text; i++)
+               free((char *) items[i].text);
+       free(items);
+       return ok;
+}
+
+static bool
+select_commit_parent(const char *id, char rev[SIZEOF_REV], const char *path)
+{
+       char buf[SIZEOF_STR * 4];
+       const char *revlist_argv[] = {
+               "git", "log", "--no-color", "-1",
+                       "--pretty=format:%P", id, "--", path, NULL
+       };
+       int parents;
+
+       if (!run_io_buf(revlist_argv, buf, sizeof(buf)) ||
+           (parents = strlen(buf) / 40) < 0) {
+               report("Failed to get parent information");
                return FALSE;
 
-       default:
-               report("Unknown key, press 'h' for help");
-               return TRUE;
+       } else if (parents == 0) {
+               if (path)
+                       report("Path '%s' does not exist in the parent", path);
+               else
+                       report("The selected commit has no parents");
+               return FALSE;
        }
 
+       if (parents > 1 && !open_commit_parent_menu(buf, &parents))
+               return FALSE;
+
+       string_copy_rev(rev, &buf[41 * parents]);
        return TRUE;
 }
 
-
 /*
  * Pager backend
  */
@@ -2917,11 +3756,12 @@ view_driver(struct view *view, enum request request)
 static bool
 pager_draw(struct view *view, struct line *line, unsigned int lineno)
 {
-       char *text = line->data;
+       char text[SIZEOF_STR];
 
        if (opt_line_number && draw_lineno(view, lineno))
                return TRUE;
 
+       string_expand(text, sizeof(text), line->data, opt_tab_size);
        draw_text(view, line->type, text, TRUE);
        return TRUE;
 }
@@ -2929,22 +3769,10 @@ pager_draw(struct view *view, struct line *line, unsigned int lineno)
 static bool
 add_describe_ref(char *buf, size_t *bufpos, const char *commit_id, const char *sep)
 {
-       char refbuf[SIZEOF_STR];
-       char *ref = NULL;
-       FILE *pipe;
+       const char *describe_argv[] = { "git", "describe", commit_id, NULL };
+       char ref[SIZEOF_STR];
 
-       if (!string_format(refbuf, "git describe %s 2>/dev/null", commit_id))
-               return TRUE;
-
-       pipe = popen(refbuf, "r");
-       if (!pipe)
-               return TRUE;
-
-       if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
-               ref = chomp_string(ref);
-       pclose(pipe);
-
-       if (!ref || !*ref)
+       if (!run_io_buf(describe_argv, ref, sizeof(ref)) || !*ref)
                return TRUE;
 
        /* This is the only fatal call, since it can "corrupt" the buffer. */
@@ -2959,22 +3787,22 @@ add_pager_refs(struct view *view, struct line *line)
 {
        char buf[SIZEOF_STR];
        char *commit_id = (char *)line->data + STRING_SIZE("commit ");
-       struct ref **refs;
-       size_t bufpos = 0, refpos = 0;
+       struct ref_list *list;
+       size_t bufpos = 0, i;
        const char *sep = "Refs: ";
        bool is_tag = FALSE;
 
        assert(line->type == LINE_COMMIT);
 
-       refs = get_refs(commit_id);
-       if (!refs) {
+       list = get_ref_list(commit_id);
+       if (!list) {
                if (view == VIEW(REQ_VIEW_DIFF))
                        goto try_add_describe_ref;
                return;
        }
 
-       do {
-               struct ref *ref = refs[refpos];
+       for (i = 0; i < list->size; i++) {
+               struct ref *ref = list->refs[i];
                const char *fmt = ref->tag    ? "%s[%s]" :
                                  ref->remote ? "%s<%s>" : "%s%s";
 
@@ -2983,7 +3811,7 @@ add_pager_refs(struct view *view, struct line *line)
                sep = ", ";
                if (ref->tag)
                        is_tag = TRUE;
-       } while (refs[refpos++]->next);
+       }
 
        if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
 try_add_describe_ref:
@@ -2995,9 +3823,6 @@ try_add_describe_ref:
        if (bufpos == 0)
                return;
 
-       if (!realloc_lines(view, view->line_size + 1))
-               return;
-
        add_line_text(view, buf, LINE_PP_REFS);
 }
 
@@ -3053,16 +3878,9 @@ pager_request(struct view *view, enum request request, struct line *line)
 static bool
 pager_grep(struct view *view, struct line *line)
 {
-       regmatch_t pmatch;
-       char *text = line->data;
-
-       if (!*text)
-               return FALSE;
+       const char *text[] = { line->data, NULL };
 
-       if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
-               return FALSE;
-
-       return TRUE;
+       return grep_text(view, text);
 }
 
 static void
@@ -3080,6 +3898,7 @@ pager_select(struct view *view, struct line *line)
 static struct view_ops pager_ops = {
        "line",
        NULL,
+       NULL,
        pager_read,
        pager_draw,
        pager_request,
@@ -3087,6 +3906,10 @@ static struct view_ops pager_ops = {
        pager_select,
 };
 
+static const char *log_argv[SIZEOF_ARG] = {
+       "git", "log", "--no-color", "--cc", "--stat", "-n100", "%(head)", NULL
+};
+
 static enum request
 log_request(struct view *view, enum request request, struct line *line)
 {
@@ -3102,6 +3925,7 @@ log_request(struct view *view, enum request request, struct line *line)
 
 static struct view_ops log_ops = {
        "line",
+       log_argv,
        NULL,
        pager_read,
        pager_draw,
@@ -3110,88 +3934,169 @@ static struct view_ops log_ops = {
        pager_select,
 };
 
+static const char *diff_argv[SIZEOF_ARG] = {
+       "git", "show", "--pretty=fuller", "--no-color", "--root",
+               "--patch-with-stat", "--find-copies-harder", "-C", "%(commit)", NULL
+};
+
+static struct view_ops diff_ops = {
+       "line",
+       diff_argv,
+       NULL,
+       pager_read,
+       pager_draw,
+       pager_request,
+       pager_grep,
+       pager_select,
+};
 
 /*
  * Help backend
  */
 
-static bool
-help_open(struct view *view)
+static bool help_keymap_hidden[ARRAY_SIZE(keymap_table)];
+
+static char *
+help_name(char buf[SIZEOF_STR], const char *name, size_t namelen)
 {
-       char buf[BUFSIZ];
-       int lines = ARRAY_SIZE(req_info) + 2;
-       int i;
+       int bufpos;
 
-       if (view->lines > 0)
-               return TRUE;
+       for (bufpos = 0; bufpos <= namelen; bufpos++) {
+               buf[bufpos] = tolower(name[bufpos]);
+               if (buf[bufpos] == '_')
+                       buf[bufpos] = '-';
+       }
 
-       for (i = 0; i < ARRAY_SIZE(req_info); i++)
-               if (!req_info[i].request)
-                       lines++;
+       buf[bufpos] = 0;
+       return buf;
+}
 
-       lines += run_requests + 1;
+#define help_keymap_name(buf, keymap) \
+       help_name(buf, keymap_table[keymap].name, keymap_table[keymap].namelen)
 
-       view->line = calloc(lines, sizeof(*view->line));
-       if (!view->line)
-               return FALSE;
+static bool
+help_open_keymap_title(struct view *view, enum keymap keymap)
+{
+       char buf[SIZEOF_STR];
+       struct line *line;
 
-       add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
+       line = add_line_format(view, LINE_HELP_KEYMAP, "[%c] %s bindings",
+                              help_keymap_hidden[keymap] ? '+' : '-',
+                              help_keymap_name(buf, keymap));
+       if (line)
+               line->other = keymap;
+
+       return help_keymap_hidden[keymap];
+}
+
+static void
+help_open_keymap(struct view *view, enum keymap keymap)
+{
+       const char *group = NULL;
+       char buf[SIZEOF_STR];
+       size_t bufpos;
+       bool add_title = TRUE;
+       int i;
 
        for (i = 0; i < ARRAY_SIZE(req_info); i++) {
-               const char *key;
+               const char *key = NULL;
 
                if (req_info[i].request == REQ_NONE)
                        continue;
 
                if (!req_info[i].request) {
-                       add_line_text(view, "", LINE_DEFAULT);
-                       add_line_text(view, req_info[i].help, LINE_DEFAULT);
+                       group = req_info[i].help;
                        continue;
                }
 
-               key = get_key(req_info[i].request);
-               if (!*key)
-                       key = "(no key defined)";
-
-               if (!string_format(buf, "    %-25s %s", key, req_info[i].help))
+               key = get_keys(keymap, req_info[i].request, TRUE);
+               if (!key || !*key)
                        continue;
 
-               add_line_text(view, buf, LINE_DEFAULT);
-       }
+               if (add_title && help_open_keymap_title(view, keymap))
+                       return;
+               add_title = false;
+
+               if (group) {
+                       add_line_text(view, group, LINE_HELP_GROUP);
+                       group = NULL;
+               }
 
-       if (run_requests) {
-               add_line_text(view, "", LINE_DEFAULT);
-               add_line_text(view, "External commands:", LINE_DEFAULT);
+               add_line_format(view, LINE_DEFAULT, "    %-25s %-20s %s", key,
+                               help_name(buf, req_info[i].name, req_info[i].namelen),
+                               req_info[i].help);
        }
 
+       group = "External commands:";
+
        for (i = 0; i < run_requests; i++) {
                struct run_request *req = get_run_request(REQ_NONE + i + 1);
                const char *key;
+               int argc;
 
-               if (!req)
+               if (!req || req->keymap != keymap)
                        continue;
 
                key = get_key_name(req->key);
                if (!*key)
                        key = "(no key defined)";
 
-               if (!string_format(buf, "    %-10s %-14s `%s`",
-                                  keymap_table[req->keymap].name,
-                                  key, req->cmd))
-                       continue;
+               if (add_title && help_open_keymap_title(view, keymap))
+                       return;
+               if (group) {
+                       add_line_text(view, group, LINE_HELP_GROUP);
+                       group = NULL;
+               }
 
-               add_line_text(view, buf, LINE_DEFAULT);
+               for (bufpos = 0, argc = 0; req->argv[argc]; argc++)
+                       if (!string_format_from(buf, &bufpos, "%s%s",
+                                               argc ? " " : "", req->argv[argc]))
+                               return;
+
+               add_line_format(view, LINE_DEFAULT, "    %-25s `%s`", key, buf);
        }
+}
+
+static bool
+help_open(struct view *view)
+{
+       enum keymap keymap;
+
+       reset_view(view);
+       add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
+       add_line_text(view, "", LINE_DEFAULT);
+
+       for (keymap = 0; keymap < ARRAY_SIZE(keymap_table); keymap++)
+               help_open_keymap(view, keymap);
 
        return TRUE;
 }
 
+static enum request
+help_request(struct view *view, enum request request, struct line *line)
+{
+       switch (request) {
+       case REQ_ENTER:
+               if (line->type == LINE_HELP_KEYMAP) {
+                       help_keymap_hidden[line->other] =
+                               !help_keymap_hidden[line->other];
+                       view->p_restore = TRUE;
+                       open_view(view, REQ_VIEW_HELP, OPEN_REFRESH);
+               }
+
+               return REQ_NONE;
+       default:
+               return pager_request(view, request, line);
+       }
+}
+
 static struct view_ops help_ops = {
        "line",
+       NULL,
        help_open,
        NULL,
        pager_draw,
-       pager_request,
+       help_request,
        pager_grep,
        pager_select,
 };
@@ -3247,110 +4152,221 @@ push_tree_stack_entry(const char *name, unsigned long lineno)
 
 /* Parse output from git-ls-tree(1):
  *
- * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26        Makefile
- * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6        README
  * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657        tig.c
- * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38        web.conf
  */
 
 #define SIZEOF_TREE_ATTR \
-       STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
+       STRING_SIZE("100644 blob f931e1d229c3e185caad4449bf5b66ed72462657\t")
+
+#define SIZEOF_TREE_MODE \
+       STRING_SIZE("100644 ")
+
+#define TREE_ID_OFFSET \
+       STRING_SIZE("100644 blob ")
+
+struct tree_entry {
+       char id[SIZEOF_REV];
+       mode_t mode;
+       time_t time;                    /* Date from the author ident. */
+       const char *author;             /* Author of the commit. */
+       char name[1];
+};
+
+static const char *
+tree_path(const struct line *line)
+{
+       return ((struct tree_entry *) line->data)->name;
+}
+
+static int
+tree_compare_entry(const struct line *line1, const struct line *line2)
+{
+       if (line1->type != line2->type)
+               return line1->type == LINE_TREE_DIR ? -1 : 1;
+       return strcmp(tree_path(line1), tree_path(line2));
+}
 
-#define TREE_UP_FORMAT "040000 tree %s\t.."
+static const enum sort_field tree_sort_fields[] = {
+       ORDERBY_NAME, ORDERBY_DATE, ORDERBY_AUTHOR
+};
+static struct sort_state tree_sort_state = SORT_STATE(tree_sort_fields);
 
 static int
-tree_compare_entry(enum line_type type1, const char *name1,
-                  enum line_type type2, const char *name2)
+tree_compare(const void *l1, const void *l2)
 {
-       if (type1 != type2) {
-               if (type1 == LINE_TREE_DIR)
-                       return -1;
+       const struct line *line1 = (const struct line *) l1;
+       const struct line *line2 = (const struct line *) l2;
+       const struct tree_entry *entry1 = ((const struct line *) l1)->data;
+       const struct tree_entry *entry2 = ((const struct line *) l2)->data;
+
+       if (line1->type == LINE_TREE_HEAD)
+               return -1;
+       if (line2->type == LINE_TREE_HEAD)
                return 1;
-       }
 
-       return strcmp(name1, name2);
+       switch (get_sort_field(tree_sort_state)) {
+       case ORDERBY_DATE:
+               return sort_order(tree_sort_state, entry1->time - entry2->time);
+
+       case ORDERBY_AUTHOR:
+               return sort_order(tree_sort_state, strcmp(entry1->author, entry2->author));
+
+       case ORDERBY_NAME:
+       default:
+               return sort_order(tree_sort_state, tree_compare_entry(line1, line2));
+       }
 }
 
-static const char *
-tree_path(struct line *line)
+
+static struct line *
+tree_entry(struct view *view, enum line_type type, const char *path,
+          const char *mode, const char *id)
 {
-       const char *path = line->data;
+       struct tree_entry *entry = calloc(1, sizeof(*entry) + strlen(path));
+       struct line *line = entry ? add_line_data(view, entry, type) : NULL;
 
-       return path + SIZEOF_TREE_ATTR;
+       if (!entry || !line) {
+               free(entry);
+               return NULL;
+       }
+
+       strncpy(entry->name, path, strlen(path));
+       if (mode)
+               entry->mode = strtoul(mode, NULL, 8);
+       if (id)
+               string_copy_rev(entry->id, id);
+
+       return line;
 }
 
 static bool
-tree_read(struct view *view, char *text)
+tree_read_date(struct view *view, char *text, bool *read_date)
 {
-       size_t textlen = text ? strlen(text) : 0;
-       char buf[SIZEOF_STR];
-       unsigned long pos;
-       enum line_type type;
-       bool first_read = view->lines == 0;
+       static const char *author_name;
+       static time_t author_time;
 
-       if (!text)
+       if (!text && *read_date) {
+               *read_date = FALSE;
                return TRUE;
-       if (textlen <= SIZEOF_TREE_ATTR)
+
+       } else if (!text) {
+               char *path = *opt_path ? opt_path : ".";
+               /* Find next entry to process */
+               const char *log_file[] = {
+                       "git", "log", "--no-color", "--pretty=raw",
+                               "--cc", "--raw", view->id, "--", path, NULL
+               };
+               struct io io = {};
+
+               if (!view->lines) {
+                       tree_entry(view, LINE_TREE_HEAD, opt_path, NULL, NULL);
+                       report("Tree is empty");
+                       return TRUE;
+               }
+
+               if (!run_io_rd(&io, log_file, opt_cdup, FORMAT_NONE)) {
+                       report("Failed to load tree data");
+                       return TRUE;
+               }
+
+               done_io(view->pipe);
+               view->io = io;
+               *read_date = TRUE;
                return FALSE;
 
-       type = text[STRING_SIZE("100644 ")] == 't'
-            ? LINE_TREE_DIR : LINE_TREE_FILE;
+       } else if (*text == 'a' && get_line_type(text) == LINE_AUTHOR) {
+               parse_author_line(text + STRING_SIZE("author "),
+                                 &author_name, &author_time);
 
-       if (first_read) {
-               /* Add path info line */
-               if (!string_format(buf, "Directory path /%s", opt_path) ||
-                   !realloc_lines(view, view->line_size + 1) ||
-                   !add_line_text(view, buf, LINE_DEFAULT))
-                       return FALSE;
+       } else if (*text == ':') {
+               char *pos;
+               size_t annotated = 1;
+               size_t i;
 
-               /* Insert "link" to parent directory. */
-               if (*opt_path) {
-                       if (!string_format(buf, TREE_UP_FORMAT, view->ref) ||
-                           !realloc_lines(view, view->line_size + 1) ||
-                           !add_line_text(view, buf, LINE_TREE_DIR))
-                               return FALSE;
+               pos = strchr(text, '\t');
+               if (!pos)
+                       return TRUE;
+               text = pos + 1;
+               if (*opt_path && !strncmp(text, opt_path, strlen(opt_path)))
+                       text += strlen(opt_path);
+               pos = strchr(text, '/');
+               if (pos)
+                       *pos = 0;
+
+               for (i = 1; i < view->lines; i++) {
+                       struct line *line = &view->line[i];
+                       struct tree_entry *entry = line->data;
+
+                       annotated += !!entry->author;
+                       if (entry->author || strcmp(entry->name, text))
+                               continue;
+
+                       entry->author = author_name;
+                       entry->time = author_time;
+                       line->dirty = 1;
+                       break;
                }
+
+               if (annotated == view->lines)
+                       kill_io(view->pipe);
        }
+       return TRUE;
+}
+
+static bool
+tree_read(struct view *view, char *text)
+{
+       static bool read_date = FALSE;
+       struct tree_entry *data;
+       struct line *entry, *line;
+       enum line_type type;
+       size_t textlen = text ? strlen(text) : 0;
+       char *path = text + SIZEOF_TREE_ATTR;
+
+       if (read_date || !text)
+               return tree_read_date(view, text, &read_date);
+
+       if (textlen <= SIZEOF_TREE_ATTR)
+               return FALSE;
+       if (view->lines == 0 &&
+           !tree_entry(view, LINE_TREE_HEAD, opt_path, NULL, NULL))
+               return FALSE;
 
        /* Strip the path part ... */
        if (*opt_path) {
                size_t pathlen = textlen - SIZEOF_TREE_ATTR;
                size_t striplen = strlen(opt_path);
-               char *path = text + SIZEOF_TREE_ATTR;
 
                if (pathlen > striplen)
                        memmove(path, path + striplen,
                                pathlen - striplen + 1);
+
+               /* Insert "link" to parent directory. */
+               if (view->lines == 1 &&
+                   !tree_entry(view, LINE_TREE_DIR, "..", "040000", view->ref))
+                       return FALSE;
        }
 
-       /* Skip "Directory ..." and ".." line. */
-       for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
-               struct line *line = &view->line[pos];
-               const char *path1 = tree_path(line);
-               char *path2 = text + SIZEOF_TREE_ATTR;
-               int cmp = tree_compare_entry(line->type, path1, type, path2);
+       type = text[SIZEOF_TREE_MODE] == 't' ? LINE_TREE_DIR : LINE_TREE_FILE;
+       entry = tree_entry(view, type, path, text, text + TREE_ID_OFFSET);
+       if (!entry)
+               return FALSE;
+       data = entry->data;
 
-               if (cmp <= 0)
+       /* Skip "Directory ..." and ".." line. */
+       for (line = &view->line[1 + !!*opt_path]; line < entry; line++) {
+               if (tree_compare_entry(line, entry) <= 0)
                        continue;
 
-               text = strdup(text);
-               if (!text)
-                       return FALSE;
-
-               if (view->lines > pos)
-                       memmove(&view->line[pos + 1], &view->line[pos],
-                               (view->lines - pos) * sizeof(*line));
+               memmove(line + 1, line, (entry - line) * sizeof(*entry));
 
-               line = &view->line[pos];
-               line->data = text;
+               line->data = data;
                line->type = type;
-               view->lines++;
+               for (; line <= entry; line++)
+                       line->dirty = line->cleareol = 1;
                return TRUE;
        }
 
-       if (!add_line_text(view, text, type))
-               return FALSE;
-
        if (tree_lineno > view->lineno) {
                view->lineno = tree_lineno;
                tree_lineno = 0;
@@ -3359,6 +4375,45 @@ tree_read(struct view *view, char *text)
        return TRUE;
 }
 
+static bool
+tree_draw(struct view *view, struct line *line, unsigned int lineno)
+{
+       struct tree_entry *entry = line->data;
+
+       if (line->type == LINE_TREE_HEAD) {
+               if (draw_text(view, line->type, "Directory path /", TRUE))
+                       return TRUE;
+       } else {
+               if (draw_mode(view, entry->mode))
+                       return TRUE;
+
+               if (opt_author && draw_author(view, entry->author))
+                       return TRUE;
+
+               if (opt_date && draw_date(view, entry->author ? &entry->time : NULL))
+                       return TRUE;
+       }
+       if (draw_text(view, line->type, entry->name, TRUE))
+               return TRUE;
+       return TRUE;
+}
+
+static void
+open_blob_editor()
+{
+       char file[SIZEOF_STR] = "/tmp/tigblob.XXXXXX";
+       int fd = mkstemp(file);
+
+       if (fd == -1)
+               report("Failed to create temporary file");
+       else if (!run_io_append(blob_ops.argv, FORMAT_ALL, fd))
+               report("Failed to save blob data to file");
+       else
+               open_editor(FALSE, file);
+       if (fd != -1)
+               unlink(file);
+}
+
 static enum request
 tree_request(struct view *view, enum request request, struct line *line)
 {
@@ -3372,10 +4427,24 @@ tree_request(struct view *view, enum request request, struct line *line)
                }
 
                string_copy(opt_ref, view->vid);
-               string_format(opt_file, "%s%s", opt_path, tree_path(line));
                return request;
 
-       case REQ_TREE_PARENT:
+       case REQ_EDIT:
+               if (line->type != LINE_TREE_FILE) {
+                       report("Edit only supported for files");
+               } else if (!is_head_commit(view->vid)) {
+                       open_blob_editor();
+               } else {
+                       open_editor(TRUE, opt_file);
+               }
+               return REQ_NONE;
+
+       case REQ_TOGGLE_SORT_FIELD:
+       case REQ_TOGGLE_SORT_ORDER:
+               sort_view(view, request, &tree_sort_state, tree_compare);
+               return REQ_NONE;
+
+       case REQ_PARENT:
                if (!*opt_path) {
                        /* quit view if at top of tree */
                        return REQ_VIEW_CLOSE;
@@ -3397,7 +4466,7 @@ tree_request(struct view *view, enum request request, struct line *line)
 
        switch (line->type) {
        case LINE_TREE_DIR:
-               /* Depending on whether it is a subdir or parent (updir?) link
+               /* Depending on whether it is a subdirectory or parent link
                 * mangle the path buffer. */
                if (line == &view->line[1] && *opt_path) {
                        pop_tree_stack_entry();
@@ -3420,40 +4489,86 @@ tree_request(struct view *view, enum request request, struct line *line)
                break;
 
        default:
-               return TRUE;
+               return REQ_NONE;
        }
 
        open_view(view, request, flags);
-       if (request == REQ_VIEW_TREE) {
+       if (request == REQ_VIEW_TREE)
                view->lineno = tree_lineno;
-       }
 
-       return REQ_NONE;
+       return REQ_NONE;
+}
+
+static bool
+tree_grep(struct view *view, struct line *line)
+{
+       struct tree_entry *entry = line->data;
+       const char *text[] = {
+               entry->name,
+               opt_author ? entry->author : "",
+               opt_date ? mkdate(&entry->time) : "",
+               NULL
+       };
+
+       return grep_text(view, text);
 }
 
 static void
 tree_select(struct view *view, struct line *line)
 {
-       char *text = (char *)line->data + STRING_SIZE("100644 blob ");
+       struct tree_entry *entry = line->data;
 
        if (line->type == LINE_TREE_FILE) {
-               string_copy_rev(ref_blob, text);
+               string_copy_rev(ref_blob, entry->id);
+               string_format(opt_file, "%s%s", opt_path, tree_path(line));
 
        } else if (line->type != LINE_TREE_DIR) {
                return;
        }
 
-       string_copy_rev(view->ref, text);
+       string_copy_rev(view->ref, entry->id);
+}
+
+static bool
+tree_prepare(struct view *view)
+{
+       if (view->lines == 0 && opt_prefix[0]) {
+               char *pos = opt_prefix;
+
+               while (pos && *pos) {
+                       char *end = strchr(pos, '/');
+
+                       if (end)
+                               *end = 0;
+                       push_tree_stack_entry(pos, 0);
+                       pos = end;
+                       if (end) {
+                               *end = '/';
+                               pos++;
+                       }
+               }
+
+       } else if (strcmp(view->vid, view->id)) {
+               opt_path[0] = 0;
+       }
+
+       return init_io_rd(&view->io, view->ops->argv, opt_cdup, FORMAT_ALL);
 }
 
+static const char *tree_argv[SIZEOF_ARG] = {
+       "git", "ls-tree", "%(commit)", "%(directory)", NULL
+};
+
 static struct view_ops tree_ops = {
        "file",
+       tree_argv,
        NULL,
        tree_read,
-       pager_draw,
+       tree_draw,
        tree_request,
-       pager_grep,
+       tree_grep,
        tree_select,
+       tree_prepare,
 };
 
 static bool
@@ -3464,12 +4579,29 @@ blob_read(struct view *view, char *line)
        return add_line_text(view, line, LINE_DEFAULT) != NULL;
 }
 
+static enum request
+blob_request(struct view *view, enum request request, struct line *line)
+{
+       switch (request) {
+       case REQ_EDIT:
+               open_blob_editor();
+               return REQ_NONE;
+       default:
+               return pager_request(view, request, line);
+       }
+}
+
+static const char *blob_argv[SIZEOF_ARG] = {
+       "git", "cat-file", "blob", "%(blob)", NULL
+};
+
 static struct view_ops blob_ops = {
        "line",
+       blob_argv,
        NULL,
        blob_read,
        pager_draw,
-       pager_request,
+       blob_request,
        pager_grep,
        pager_select,
 };
@@ -3485,58 +4617,51 @@ static struct view_ops blob_ops = {
  *     reading output from git-blame.
  */
 
+static const char *blame_head_argv[] = {
+       "git", "blame", "--incremental", "--", "%(file)", NULL
+};
+
+static const char *blame_ref_argv[] = {
+       "git", "blame", "--incremental", "%(ref)", "--", "%(file)", NULL
+};
+
+static const char *blame_cat_file_argv[] = {
+       "git", "cat-file", "blob", "%(ref):%(file)", NULL
+};
+
 struct blame_commit {
        char id[SIZEOF_REV];            /* SHA1 ID. */
        char title[128];                /* First line of the commit message. */
-       char author[75];                /* Author of the commit. */
-       struct tm time;                 /* Date from the author ident. */
+       const char *author;             /* Author of the commit. */
+       time_t time;                    /* Date from the author ident. */
        char filename[128];             /* Name of file. */
+       bool has_previous;              /* Was a "previous" line detected. */
 };
 
 struct blame {
        struct blame_commit *commit;
-       unsigned int header:1;
+       unsigned long lineno;
        char text[1];
 };
 
-#define BLAME_CAT_FILE_CMD "git cat-file blob %s:%s"
-#define BLAME_INCREMENTAL_CMD "git blame --incremental %s -- %s"
-
 static bool
 blame_open(struct view *view)
 {
        char path[SIZEOF_STR];
-       char ref[SIZEOF_STR] = "";
-
-       if (sq_quote(path, 0, opt_file) >= sizeof(path))
-               return FALSE;
 
-       if (*opt_ref && sq_quote(ref, 0, opt_ref) >= sizeof(ref))
-               return FALSE;
-
-       if (*opt_ref) {
-               if (!string_format(view->cmd, BLAME_CAT_FILE_CMD, ref, path))
-                       return FALSE;
-       } else {
-               view->pipe = fopen(opt_file, "r");
-               if (!view->pipe &&
-                   !string_format(view->cmd, BLAME_CAT_FILE_CMD, "HEAD", path))
+       if (!view->parent && *opt_prefix) {
+               string_copy(path, opt_file);
+               if (!string_format(opt_file, "%s%s", opt_prefix, path))
                        return FALSE;
        }
 
-       if (!view->pipe)
-               view->pipe = popen(view->cmd, "r");
-       if (!view->pipe)
-               return FALSE;
-
-       if (!string_format(view->cmd, BLAME_INCREMENTAL_CMD, ref, path))
-               return FALSE;
+       if (*opt_ref || !io_open(&view->io, "%s%s", opt_cdup, opt_file)) {
+               if (!run_io_rd(&view->io, blame_cat_file_argv, opt_cdup, FORMAT_ALL))
+                       return FALSE;
+       }
 
-       reset_view(view);
+       setup_update(view, opt_file);
        string_format(view->ref, "%s ...", opt_file);
-       string_copy_rev(view->vid, opt_file);
-       set_nonblocking_input(TRUE);
-       view->start_time = time(NULL);
 
        return TRUE;
 }
@@ -3587,14 +4712,16 @@ parse_blame_commit(struct view *view, const char *text, int *blamed)
 {
        struct blame_commit *commit;
        struct blame *blame;
-       const char *pos = text + SIZEOF_REV - 1;
+       const char *pos = text + SIZEOF_REV - 2;
+       size_t orig_lineno = 0;
        size_t lineno;
        size_t group;
 
-       if (strlen(text) <= SIZEOF_REV || *pos != ' ')
+       if (strlen(text) <= SIZEOF_REV || pos[1] != ' ')
                return NULL;
 
-       if (!parse_number(&pos, &lineno, 1, view->lines) ||
+       if (!parse_number(&pos, &orig_lineno, 1, 9999999) ||
+           !parse_number(&pos, &lineno, 1, view->lines) ||
            !parse_number(&pos, &group, 1, view->lines - lineno + 1))
                return NULL;
 
@@ -3608,7 +4735,7 @@ parse_blame_commit(struct view *view, const char *text, int *blamed)
 
                blame = line->data;
                blame->commit = commit;
-               blame->header = !group;
+               blame->lineno = orig_lineno + group - 1;
                line->dirty = 1;
        }
 
@@ -3616,29 +4743,32 @@ parse_blame_commit(struct view *view, const char *text, int *blamed)
 }
 
 static bool
-blame_read_file(struct view *view, const char *line)
+blame_read_file(struct view *view, const char *line, bool *read_file)
 {
        if (!line) {
-               FILE *pipe = NULL;
+               const char **argv = *opt_ref ? blame_ref_argv : blame_head_argv;
+               struct io io = {};
 
-               if (view->lines > 0)
-                       pipe = popen(view->cmd, "r");
-               else if (!view->parent)
+               if (view->lines == 0 && !view->parent)
                        die("No blame exist for %s", view->vid);
-               view->cmd[0] = 0;
-               if (!pipe) {
+
+               if (view->lines == 0 || !run_io_rd(&io, argv, opt_cdup, FORMAT_ALL)) {
                        report("Failed to load blame data");
                        return TRUE;
                }
 
-               fclose(view->pipe);
-               view->pipe = pipe;
+               done_io(view->pipe);
+               view->io = io;
+               *read_file = FALSE;
                return FALSE;
 
        } else {
                size_t linelen = strlen(line);
                struct blame *blame = malloc(sizeof(*blame) + linelen);
 
+               if (!blame)
+                       return FALSE;
+
                blame->commit = NULL;
                strncpy(blame->text, line, linelen);
                blame->text[linelen] = 0;
@@ -3663,15 +4793,16 @@ blame_read(struct view *view, char *line)
 {
        static struct blame_commit *commit = NULL;
        static int blamed = 0;
-       static time_t author_time;
+       static bool read_file = TRUE;
 
-       if (*view->cmd)
-               return blame_read_file(view, line);
+       if (read_file)
+               return blame_read_file(view, line, &read_file);
 
        if (!line) {
                /* Reset all! */
                commit = NULL;
                blamed = 0;
+               read_file = TRUE;
                string_format(view->ref, "%s", view->vid);
                if (view_is_displayed(view)) {
                        update_view_title(view);
@@ -3683,31 +4814,23 @@ blame_read(struct view *view, char *line)
        if (!commit) {
                commit = parse_blame_commit(view, line, &blamed);
                string_format(view->ref, "%s %2d%%", view->vid,
-                             blamed * 100 / view->lines);
+                             view->lines ? blamed * 100 / view->lines : 0);
 
        } else if (match_blame_header("author ", &line)) {
-               string_ncopy(commit->author, line, strlen(line));
+               commit->author = get_author(line);
 
        } else if (match_blame_header("author-time ", &line)) {
-               author_time = (time_t) atol(line);
+               commit->time = (time_t) atol(line);
 
        } else if (match_blame_header("author-tz ", &line)) {
-               long tz;
-
-               tz  = ('0' - line[1]) * 60 * 60 * 10;
-               tz += ('0' - line[2]) * 60 * 60;
-               tz += ('0' - line[3]) * 60;
-               tz += ('0' - line[4]) * 60;
-
-               if (line[0] == '-')
-                       tz = -tz;
-
-               author_time -= tz;
-               gmtime_r(&author_time, &commit->time);
+               parse_timezone(&commit->time, line);
 
        } else if (match_blame_header("summary ", &line)) {
                string_ncopy(commit->title, line, strlen(line));
 
+       } else if (match_blame_header("previous ", &line)) {
+               commit->has_previous = TRUE;
+
        } else if (match_blame_header("filename ", &line)) {
                string_ncopy(commit->filename, line, strlen(line));
                commit = NULL;
@@ -3720,8 +4843,9 @@ static bool
 blame_draw(struct view *view, struct line *line, unsigned int lineno)
 {
        struct blame *blame = line->data;
-       struct tm *time = NULL;
+       time_t *time = NULL;
        const char *id = NULL, *author = NULL;
+       char text[SIZEOF_STR];
 
        if (blame->commit && *blame->commit->filename) {
                id = blame->commit->id;
@@ -3732,8 +4856,7 @@ blame_draw(struct view *view, struct line *line, unsigned int lineno)
        if (opt_date && draw_date(view, time))
                return TRUE;
 
-       if (opt_author &&
-           draw_field(view, LINE_MAIN_AUTHOR, author, opt_author_cols, TRUE))
+       if (opt_author && draw_author(view, author))
                return TRUE;
 
        if (draw_field(view, LINE_BLAME_ID, id, ID_COLS, FALSE))
@@ -3742,10 +4865,59 @@ blame_draw(struct view *view, struct line *line, unsigned int lineno)
        if (draw_lineno(view, lineno))
                return TRUE;
 
-       draw_text(view, LINE_DEFAULT, blame->text, TRUE);
+       string_expand(text, sizeof(text), blame->text, opt_tab_size);
+       draw_text(view, LINE_DEFAULT, text, TRUE);
        return TRUE;
 }
 
+static bool
+check_blame_commit(struct blame *blame, bool check_null_id)
+{
+       if (!blame->commit)
+               report("Commit data not loaded yet");
+       else if (check_null_id && !strcmp(blame->commit->id, NULL_ID))
+               report("No commit exist for the selected line");
+       else
+               return TRUE;
+       return FALSE;
+}
+
+static void
+setup_blame_parent_line(struct view *view, struct blame *blame)
+{
+       const char *diff_tree_argv[] = {
+               "git", "diff-tree", "-U0", blame->commit->id,
+                       "--", blame->commit->filename, NULL
+       };
+       struct io io = {};
+       int parent_lineno = -1;
+       int blamed_lineno = -1;
+       char *line;
+
+       if (!run_io(&io, diff_tree_argv, NULL, IO_RD))
+               return;
+
+       while ((line = io_get(&io, '\n', TRUE))) {
+               if (*line == '@') {
+                       char *pos = strchr(line, '+');
+
+                       parent_lineno = atoi(line + 4);
+                       if (pos)
+                               blamed_lineno = atoi(pos + 1);
+
+               } else if (*line == '+' && parent_lineno != -1) {
+                       if (blame->lineno == blamed_lineno - 1 &&
+                           !strcmp(blame->text, line + 1)) {
+                               view->lineno = parent_lineno ? parent_lineno - 1 : 0;
+                               break;
+                       }
+                       blamed_lineno++;
+               }
+       }
+
+       done_io(&io);
+}
+
 static enum request
 blame_request(struct view *view, enum request request, struct line *line)
 {
@@ -3753,21 +4925,58 @@ blame_request(struct view *view, enum request request, struct line *line)
        struct blame *blame = line->data;
 
        switch (request) {
+       case REQ_VIEW_BLAME:
+               if (check_blame_commit(blame, TRUE)) {
+                       string_copy(opt_ref, blame->commit->id);
+                       string_copy(opt_file, blame->commit->filename);
+                       if (blame->lineno)
+                               view->lineno = blame->lineno;
+                       open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
+               }
+               break;
+
+       case REQ_PARENT:
+               if (check_blame_commit(blame, TRUE) &&
+                   select_commit_parent(blame->commit->id, opt_ref,
+                                        blame->commit->filename)) {
+                       string_copy(opt_file, blame->commit->filename);
+                       setup_blame_parent_line(view, blame);
+                       open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
+               }
+               break;
+
        case REQ_ENTER:
-               if (!blame->commit) {
-                       report("No commit loaded yet");
+               if (!check_blame_commit(blame, FALSE))
+                       break;
+
+               if (view_is_displayed(VIEW(REQ_VIEW_DIFF)) &&
+                   !strcmp(blame->commit->id, VIEW(REQ_VIEW_DIFF)->ref))
                        break;
-               }
 
                if (!strcmp(blame->commit->id, NULL_ID)) {
-                       char path[SIZEOF_STR];
+                       struct view *diff = VIEW(REQ_VIEW_DIFF);
+                       const char *diff_index_argv[] = {
+                               "git", "diff-index", "--root", "--patch-with-stat",
+                                       "-C", "-M", "HEAD", "--", view->vid, NULL
+                       };
+
+                       if (!blame->commit->has_previous) {
+                               diff_index_argv[1] = "diff";
+                               diff_index_argv[2] = "--no-color";
+                               diff_index_argv[6] = "--";
+                               diff_index_argv[7] = "/dev/null";
+                       }
 
-                       if (sq_quote(path, 0, view->vid) >= sizeof(path))
+                       if (!prepare_update(diff, diff_index_argv, NULL, FORMAT_DASH)) {
+                               report("Failed to allocate diff command");
                                break;
-                       string_format(opt_cmd, "git diff-index --root --patch-with-stat -C -M --cached HEAD -- %s 2>/dev/null", path);
+                       }
+                       flags |= OPEN_PREPARED;
                }
 
                open_view(view, REQ_VIEW_DIFF, flags);
+               if (VIEW(REQ_VIEW_DIFF)->pipe && !strcmp(blame->commit->id, NULL_ID))
+                       string_copy_rev(VIEW(REQ_VIEW_DIFF)->ref, NULL_ID);
                break;
 
        default:
@@ -3782,27 +4991,16 @@ blame_grep(struct view *view, struct line *line)
 {
        struct blame *blame = line->data;
        struct blame_commit *commit = blame->commit;
-       regmatch_t pmatch;
-
-#define MATCH(text, on)                                                        \
-       (on && *text && regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
-
-       if (commit) {
-               char buf[DATE_COLS + 1];
-
-               if (MATCH(commit->title, 1) ||
-                   MATCH(commit->author, opt_author) ||
-                   MATCH(commit->id, opt_date))
-                       return TRUE;
-
-               if (strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time) &&
-                   MATCH(buf, 1))
-                       return TRUE;
-       }
-
-       return MATCH(blame->text, 1);
+       const char *text[] = {
+               blame->text,
+               commit ? commit->title : "",
+               commit ? commit->id : "",
+               commit && opt_author ? commit->author : "",
+               commit && opt_date ? mkdate(&commit->time) : "",
+               NULL
+       };
 
-#undef MATCH
+       return grep_text(view, text);
 }
 
 static void
@@ -3822,6 +5020,7 @@ blame_select(struct view *view, struct line *line)
 
 static struct view_ops blame_ops = {
        "line",
+       NULL,
        blame_open,
        blame_read,
        blame_draw,
@@ -3830,6 +5029,191 @@ static struct view_ops blame_ops = {
        blame_select,
 };
 
+/*
+ * Branch backend
+ */
+
+struct branch {
+       const char *author;             /* Author of the last commit. */
+       time_t time;                    /* Date of the last activity. */
+       const struct ref *ref;          /* Name and commit ID information. */
+};
+
+static const enum sort_field branch_sort_fields[] = {
+       ORDERBY_NAME, ORDERBY_DATE, ORDERBY_AUTHOR
+};
+static struct sort_state branch_sort_state = SORT_STATE(branch_sort_fields);
+
+static int
+branch_compare(const void *l1, const void *l2)
+{
+       const struct branch *branch1 = ((const struct line *) l1)->data;
+       const struct branch *branch2 = ((const struct line *) l2)->data;
+
+       switch (get_sort_field(branch_sort_state)) {
+       case ORDERBY_DATE:
+               return sort_order(branch_sort_state, branch1->time - branch2->time);
+
+       case ORDERBY_AUTHOR:
+               return sort_order(branch_sort_state, strcmp(branch1->author, branch2->author));
+
+       case ORDERBY_NAME:
+       default:
+               return sort_order(branch_sort_state, strcmp(branch1->ref->name, branch2->ref->name));
+       }
+}
+
+static bool
+branch_draw(struct view *view, struct line *line, unsigned int lineno)
+{
+       struct branch *branch = line->data;
+       enum line_type type = branch->ref->head ? LINE_MAIN_HEAD : LINE_DEFAULT;
+
+       if (opt_date && draw_date(view, branch->author ? &branch->time : NULL))
+               return TRUE;
+
+       if (opt_author && draw_author(view, branch->author))
+               return TRUE;
+
+       draw_text(view, type, branch->ref->name, TRUE);
+       return TRUE;
+}
+
+static enum request
+branch_request(struct view *view, enum request request, struct line *line)
+{
+       switch (request) {
+       case REQ_REFRESH:
+               load_refs();
+               open_view(view, REQ_VIEW_BRANCH, OPEN_REFRESH);
+               return REQ_NONE;
+
+       case REQ_TOGGLE_SORT_FIELD:
+       case REQ_TOGGLE_SORT_ORDER:
+               sort_view(view, request, &branch_sort_state, branch_compare);
+               return REQ_NONE;
+
+       case REQ_ENTER:
+               open_view(view, REQ_VIEW_MAIN, OPEN_SPLIT);
+               return REQ_NONE;
+
+       default:
+               return request;
+       }
+}
+
+static bool
+branch_read(struct view *view, char *line)
+{
+       static char id[SIZEOF_REV];
+       struct branch *reference;
+       size_t i;
+
+       if (!line)
+               return TRUE;
+
+       switch (get_line_type(line)) {
+       case LINE_COMMIT:
+               string_copy_rev(id, line + STRING_SIZE("commit "));
+               return TRUE;
+
+       case LINE_AUTHOR:
+               for (i = 0, reference = NULL; i < view->lines; i++) {
+                       struct branch *branch = view->line[i].data;
+
+                       if (strcmp(branch->ref->id, id))
+                               continue;
+
+                       view->line[i].dirty = TRUE;
+                       if (reference) {
+                               branch->author = reference->author;
+                               branch->time = reference->time;
+                               continue;
+                       }
+
+                       parse_author_line(line + STRING_SIZE("author "),
+                                         &branch->author, &branch->time);
+                       reference = branch;
+               }
+               return TRUE;
+
+       default:
+               return TRUE;
+       }
+
+}
+
+static bool
+branch_open_visitor(void *data, const struct ref *ref)
+{
+       struct view *view = data;
+       struct branch *branch;
+
+       if (ref->tag || ref->ltag || ref->remote)
+               return TRUE;
+
+       branch = calloc(1, sizeof(*branch));
+       if (!branch)
+               return FALSE;
+
+       branch->ref = ref;
+       return !!add_line_data(view, branch, LINE_DEFAULT);
+}
+
+static bool
+branch_open(struct view *view)
+{
+       const char *branch_log[] = {
+               "git", "log", "--no-color", "--pretty=raw",
+                       "--simplify-by-decoration", "--all", NULL
+       };
+
+       if (!run_io_rd(&view->io, branch_log, NULL, FORMAT_NONE)) {
+               report("Failed to load branch data");
+               return TRUE;
+       }
+
+       setup_update(view, view->id);
+       foreach_ref(branch_open_visitor, view);
+       view->p_restore = TRUE;
+
+       return TRUE;
+}
+
+static bool
+branch_grep(struct view *view, struct line *line)
+{
+       struct branch *branch = line->data;
+       const char *text[] = {
+               branch->ref->name,
+               branch->author,
+               NULL
+       };
+
+       return grep_text(view, text);
+}
+
+static void
+branch_select(struct view *view, struct line *line)
+{
+       struct branch *branch = line->data;
+
+       string_copy_rev(view->ref, branch->ref->id);
+       string_copy_rev(ref_commit, branch->ref->id);
+       string_copy_rev(ref_head, branch->ref->id);
+}
+
+static struct view_ops branch_ops = {
+       "branch",
+       NULL,
+       branch_open,
+       branch_read,
+       branch_draw,
+       branch_request,
+       branch_grep,
+       branch_select,
+};
+
 /*
  * Status backend
  */
@@ -3854,6 +5238,8 @@ static enum line_type stage_line_type;
 static size_t stage_chunks;
 static int *stage_chunk;
 
+DEFINE_ALLOCATOR(realloc_ints, int, 32)
+
 /* This should work even for the "On branch" line. */
 static inline bool
 status_has_none(struct view *view, struct line *line)
@@ -3873,7 +5259,7 @@ status_get_diff(struct status *file, const char *buf, size_t bufsize)
        const char *new_rev  = buf + 56;
        const char *status   = buf + 97;
 
-       if (bufsize < 99 ||
+       if (bufsize < 98 ||
            old_mode[-1] != ':' ||
            new_mode[-1] != ' ' ||
            old_rev[-1]  != ' ' ||
@@ -3895,191 +5281,206 @@ status_get_diff(struct status *file, const char *buf, size_t bufsize)
 }
 
 static bool
-status_run(struct view *view, const char cmd[], char status, enum line_type type)
+status_run(struct view *view, const char *argv[], char status, enum line_type type)
 {
-       struct status *file = NULL;
        struct status *unmerged = NULL;
-       char buf[SIZEOF_STR * 4];
-       size_t bufsize = 0;
-       FILE *pipe;
+       char *buf;
+       struct io io = {};
 
-       pipe = popen(cmd, "r");
-       if (!pipe)
+       if (!run_io(&io, argv, NULL, IO_RD))
                return FALSE;
 
        add_line_data(view, NULL, type);
 
-       while (!feof(pipe) && !ferror(pipe)) {
-               char *sep;
-               size_t readsize;
+       while ((buf = io_get(&io, 0, TRUE))) {
+               struct status *file = unmerged;
 
-               readsize = fread(buf + bufsize, 1, sizeof(buf) - bufsize, pipe);
-               if (!readsize)
-                       break;
-               bufsize += readsize;
+               if (!file) {
+                       file = calloc(1, sizeof(*file));
+                       if (!file || !add_line_data(view, file, type))
+                               goto error_out;
+               }
+
+               /* Parse diff info part. */
+               if (status) {
+                       file->status = status;
+                       if (status == 'A')
+                               string_copy(file->old.rev, NULL_ID);
+
+               } else if (!file->status || file == unmerged) {
+                       if (!status_get_diff(file, buf, strlen(buf)))
+                               goto error_out;
+
+                       buf = io_get(&io, 0, TRUE);
+                       if (!buf)
+                               break;
+
+                       /* Collapse all modified entries that follow an
+                        * associated unmerged entry. */
+                       if (unmerged == file) {
+                               unmerged->status = 'U';
+                               unmerged = NULL;
+                       } else if (file->status == 'U') {
+                               unmerged = file;
+                       }
+               }
+
+               /* Grab the old name for rename/copy. */
+               if (!*file->old.name &&
+                   (file->status == 'R' || file->status == 'C')) {
+                       string_ncopy(file->old.name, buf, strlen(buf));
 
-               /* Process while we have NUL chars. */
-               while ((sep = memchr(buf, 0, bufsize))) {
-                       size_t sepsize = sep - buf + 1;
+                       buf = io_get(&io, 0, TRUE);
+                       if (!buf)
+                               break;
+               }
+
+               /* git-ls-files just delivers a NUL separated list of
+                * file names similar to the second half of the
+                * git-diff-* output. */
+               string_ncopy(file->new.name, buf, strlen(buf));
+               if (!*file->old.name)
+                       string_copy(file->old.name, file->new.name);
+               file = NULL;
+       }
+
+       if (io_error(&io)) {
+error_out:
+               done_io(&io);
+               return FALSE;
+       }
+
+       if (!view->line[view->lines - 1].data)
+               add_line_data(view, NULL, LINE_STAT_NONE);
+
+       done_io(&io);
+       return TRUE;
+}
+
+/* Don't show unmerged entries in the staged section. */
+static const char *status_diff_index_argv[] = {
+       "git", "diff-index", "-z", "--diff-filter=ACDMRTXB",
+                            "--cached", "-M", "HEAD", NULL
+};
+
+static const char *status_diff_files_argv[] = {
+       "git", "diff-files", "-z", NULL
+};
+
+static const char *status_list_other_argv[] = {
+       "git", "ls-files", "-z", "--others", "--exclude-standard", NULL
+};
+
+static const char *status_list_no_head_argv[] = {
+       "git", "ls-files", "-z", "--cached", "--exclude-standard", NULL
+};
+
+static const char *update_index_argv[] = {
+       "git", "update-index", "-q", "--unmerged", "--refresh", NULL
+};
+
+/* Restore the previous line number to stay in the context or select a
+ * line with something that can be updated. */
+static void
+status_restore(struct view *view)
+{
+       if (view->p_lineno >= view->lines)
+               view->p_lineno = view->lines - 1;
+       while (view->p_lineno < view->lines && !view->line[view->p_lineno].data)
+               view->p_lineno++;
+       while (view->p_lineno > 0 && !view->line[view->p_lineno].data)
+               view->p_lineno--;
 
-                       if (!file) {
-                               if (!realloc_lines(view, view->line_size + 1))
-                                       goto error_out;
+       /* If the above fails, always skip the "On branch" line. */
+       if (view->p_lineno < view->lines)
+               view->lineno = view->p_lineno;
+       else
+               view->lineno = 1;
 
-                               file = calloc(1, sizeof(*file));
-                               if (!file)
-                                       goto error_out;
+       if (view->lineno < view->offset)
+               view->offset = view->lineno;
+       else if (view->offset + view->height <= view->lineno)
+               view->offset = view->lineno - view->height + 1;
 
-                               add_line_data(view, file, type);
-                       }
+       view->p_restore = FALSE;
+}
 
-                       /* Parse diff info part. */
-                       if (status) {
-                               file->status = status;
-                               if (status == 'A')
-                                       string_copy(file->old.rev, NULL_ID);
+static void
+status_update_onbranch(void)
+{
+       static const char *paths[][2] = {
+               { "rebase-apply/rebasing",      "Rebasing" },
+               { "rebase-apply/applying",      "Applying mailbox" },
+               { "rebase-apply/",              "Rebasing mailbox" },
+               { "rebase-merge/interactive",   "Interactive rebase" },
+               { "rebase-merge/",              "Rebase merge" },
+               { "MERGE_HEAD",                 "Merging" },
+               { "BISECT_LOG",                 "Bisecting" },
+               { "HEAD",                       "On branch" },
+       };
+       char buf[SIZEOF_STR];
+       struct stat stat;
+       int i;
 
-                       } else if (!file->status) {
-                               if (!status_get_diff(file, buf, sepsize))
-                                       goto error_out;
+       if (is_initial_commit()) {
+               string_copy(status_onbranch, "Initial commit");
+               return;
+       }
 
-                               bufsize -= sepsize;
-                               memmove(buf, sep + 1, bufsize);
+       for (i = 0; i < ARRAY_SIZE(paths); i++) {
+               char *head = opt_head;
 
-                               sep = memchr(buf, 0, bufsize);
-                               if (!sep)
-                                       break;
-                               sepsize = sep - buf + 1;
-
-                               /* Collapse all 'M'odified entries that
-                                * follow a associated 'U'nmerged entry.
-                                */
-                               if (file->status == 'U') {
-                                       unmerged = file;
-
-                               } else if (unmerged) {
-                                       int collapse = !strcmp(buf, unmerged->new.name);
-
-                                       unmerged = NULL;
-                                       if (collapse) {
-                                               free(file);
-                                               view->lines--;
-                                               continue;
-                                       }
-                               }
-                       }
+               if (!string_format(buf, "%s/%s", opt_git_dir, paths[i][0]) ||
+                   lstat(buf, &stat) < 0)
+                       continue;
 
-                       /* Grab the old name for rename/copy. */
-                       if (!*file->old.name &&
-                           (file->status == 'R' || file->status == 'C')) {
-                               sepsize = sep - buf + 1;
-                               string_ncopy(file->old.name, buf, sepsize);
-                               bufsize -= sepsize;
-                               memmove(buf, sep + 1, bufsize);
+               if (!*opt_head) {
+                       struct io io = {};
 
-                               sep = memchr(buf, 0, bufsize);
-                               if (!sep)
-                                       break;
-                               sepsize = sep - buf + 1;
+                       if (io_open(&io, "%s/rebase-merge/head-name", opt_git_dir) &&
+                           io_read_buf(&io, buf, sizeof(buf))) {
+                               head = buf;
+                               if (!prefixcmp(head, "refs/heads/"))
+                                       head += STRING_SIZE("refs/heads/");
                        }
-
-                       /* git-ls-files just delivers a NUL separated
-                        * list of file names similar to the second half
-                        * of the git-diff-* output. */
-                       string_ncopy(file->new.name, buf, sepsize);
-                       if (!*file->old.name)
-                               string_copy(file->old.name, file->new.name);
-                       bufsize -= sepsize;
-                       memmove(buf, sep + 1, bufsize);
-                       file = NULL;
                }
-       }
 
-       if (ferror(pipe)) {
-error_out:
-               pclose(pipe);
-               return FALSE;
+               if (!string_format(status_onbranch, "%s %s", paths[i][1], head))
+                       string_copy(status_onbranch, opt_head);
+               return;
        }
 
-       if (!view->line[view->lines - 1].data)
-               add_line_data(view, NULL, LINE_STAT_NONE);
-
-       pclose(pipe);
-       return TRUE;
+       string_copy(status_onbranch, "Not currently on any branch");
 }
 
-/* Don't show unmerged entries in the staged section. */
-#define STATUS_DIFF_INDEX_CMD "git diff-index -z --diff-filter=ACDMRTXB --cached -M HEAD"
-#define STATUS_DIFF_FILES_CMD "git diff-files -z"
-#define STATUS_LIST_OTHER_CMD \
-       "git ls-files -z --others --exclude-standard"
-#define STATUS_LIST_NO_HEAD_CMD \
-       "git ls-files -z --cached --exclude-standard"
-
-#define STATUS_DIFF_INDEX_SHOW_CMD \
-       "git diff-index --root --patch-with-stat -C -M --cached HEAD -- %s %s 2>/dev/null"
-
-#define STATUS_DIFF_FILES_SHOW_CMD \
-       "git diff-files --root --patch-with-stat -C -M -- %s %s 2>/dev/null"
-
-#define STATUS_DIFF_NO_HEAD_SHOW_CMD \
-       "git diff --no-color --patch-with-stat /dev/null %s 2>/dev/null"
-
 /* First parse staged info using git-diff-index(1), then parse unstaged
  * info using git-diff-files(1), and finally untracked files using
  * git-ls-files(1). */
 static bool
 status_open(struct view *view)
 {
-       unsigned long prev_lineno = view->lineno;
-
        reset_view(view);
 
-       if (!realloc_lines(view, view->line_size + 7))
-               return FALSE;
-
        add_line_data(view, NULL, LINE_STAT_HEAD);
-       if (is_initial_commit())
-               string_copy(status_onbranch, "Initial commit");
-       else if (!*opt_head)
-               string_copy(status_onbranch, "Not currently on any branch");
-       else if (!string_format(status_onbranch, "On branch %s", opt_head))
-               return FALSE;
+       status_update_onbranch();
 
-       system("git update-index -q --refresh >/dev/null 2>/dev/null");
+       run_io_bg(update_index_argv);
 
        if (is_initial_commit()) {
-               if (!status_run(view, STATUS_LIST_NO_HEAD_CMD, 'A', LINE_STAT_STAGED))
+               if (!status_run(view, status_list_no_head_argv, 'A', LINE_STAT_STAGED))
                        return FALSE;
-       } else if (!status_run(view, STATUS_DIFF_INDEX_CMD, 0, LINE_STAT_STAGED)) {
+       } else if (!status_run(view, status_diff_index_argv, 0, LINE_STAT_STAGED)) {
                return FALSE;
        }
 
-       if (!status_run(view, STATUS_DIFF_FILES_CMD, 0, LINE_STAT_UNSTAGED) ||
-           !status_run(view, STATUS_LIST_OTHER_CMD, '?', LINE_STAT_UNTRACKED))
+       if (!status_run(view, status_diff_files_argv, 0, LINE_STAT_UNSTAGED) ||
+           !status_run(view, status_list_other_argv, '?', LINE_STAT_UNTRACKED))
                return FALSE;
 
-       /* If all went well restore the previous line number to stay in
-        * the context or select a line with something that can be
-        * updated. */
-       if (prev_lineno >= view->lines)
-               prev_lineno = view->lines - 1;
-       while (prev_lineno < view->lines && !view->line[prev_lineno].data)
-               prev_lineno++;
-       while (prev_lineno > 0 && !view->line[prev_lineno].data)
-               prev_lineno--;
-
-       /* If the above fails, always skip the "On branch" line. */
-       if (prev_lineno < view->lines)
-               view->lineno = prev_lineno;
-       else
-               view->lineno = 1;
-
-       if (view->lineno < view->offset)
-               view->offset = view->lineno;
-       else if (view->offset + view->height <= view->lineno)
-               view->offset = view->lineno - view->height + 1;
-
+       /* Restore the exact position or use the specialized restore
+        * mode? */
+       if (!view->p_restore)
+               status_restore(view);
        return TRUE;
 }
 
@@ -4109,7 +5510,7 @@ status_draw(struct view *view, struct line *line, unsigned int lineno)
 
                case LINE_STAT_NONE:
                        type = LINE_DEFAULT;
-                       text = "    (no files)";
+                       text = "  (no files)";
                        break;
 
                case LINE_STAT_HEAD:
@@ -4134,15 +5535,26 @@ status_draw(struct view *view, struct line *line, unsigned int lineno)
        return TRUE;
 }
 
+static enum request
+status_load_error(struct view *view, struct view *stage, const char *path)
+{
+       if (displayed_views() == 2 || display[current_view] != view)
+               maximize_view(view);
+       report("Failed to load '%s': %s", path, io_strerror(&stage->io));
+       return REQ_NONE;
+}
+
 static enum request
 status_enter(struct view *view, struct line *line)
 {
        struct status *status = line->data;
-       char oldpath[SIZEOF_STR] = "";
-       char newpath[SIZEOF_STR] = "";
+       const char *oldpath = status ? status->old.name : NULL;
+       /* Diffs for unmerged entries are empty when passing the new
+        * path, so leave it empty. */
+       const char *newpath = status && status->status != 'U' ? status->new.name : NULL;
        const char *info;
-       size_t cmdsize = 0;
        enum open_flags split;
+       struct view *stage = VIEW(REQ_VIEW_STAGE);
 
        if (line->type == LINE_STAT_NONE ||
            (!status && line[1].type == LINE_STAT_NONE)) {
@@ -4150,33 +5562,25 @@ status_enter(struct view *view, struct line *line)
                return REQ_NONE;
        }
 
-       if (status) {
-               if (sq_quote(oldpath, 0, status->old.name) >= sizeof(oldpath))
-                       return REQ_QUIT;
-               /* Diffs for unmerged entries are empty when pasing the
-                * new path, so leave it empty. */
-               if (status->status != 'U' &&
-                   sq_quote(newpath, 0, status->new.name) >= sizeof(newpath))
-                       return REQ_QUIT;
-       }
-
-       if (opt_cdup[0] &&
-           line->type != LINE_STAT_UNTRACKED &&
-           !string_format_from(opt_cmd, &cmdsize, "cd %s;", opt_cdup))
-               return REQ_QUIT;
-
        switch (line->type) {
        case LINE_STAT_STAGED:
                if (is_initial_commit()) {
-                       if (!string_format_from(opt_cmd, &cmdsize,
-                                               STATUS_DIFF_NO_HEAD_SHOW_CMD,
-                                               newpath))
-                               return REQ_QUIT;
+                       const char *no_head_diff_argv[] = {
+                               "git", "diff", "--no-color", "--patch-with-stat",
+                                       "--", "/dev/null", newpath, NULL
+                       };
+
+                       if (!prepare_update(stage, no_head_diff_argv, opt_cdup, FORMAT_DASH))
+                               return status_load_error(view, stage, newpath);
                } else {
-                       if (!string_format_from(opt_cmd, &cmdsize,
-                                               STATUS_DIFF_INDEX_SHOW_CMD,
-                                               oldpath, newpath))
-                               return REQ_QUIT;
+                       const char *index_show_argv[] = {
+                               "git", "diff-index", "--root", "--patch-with-stat",
+                                       "-C", "-M", "--cached", "HEAD", "--",
+                                       oldpath, newpath, NULL
+                       };
+
+                       if (!prepare_update(stage, index_show_argv, opt_cdup, FORMAT_DASH))
+                               return status_load_error(view, stage, newpath);
                }
 
                if (status)
@@ -4186,20 +5590,22 @@ status_enter(struct view *view, struct line *line)
                break;
 
        case LINE_STAT_UNSTAGED:
-               if (!string_format_from(opt_cmd, &cmdsize,
-                                       STATUS_DIFF_FILES_SHOW_CMD, oldpath, newpath))
-                       return REQ_QUIT;
+       {
+               const char *files_show_argv[] = {
+                       "git", "diff-files", "--root", "--patch-with-stat",
+                               "-C", "-M", "--", oldpath, newpath, NULL
+               };
+
+               if (!prepare_update(stage, files_show_argv, opt_cdup, FORMAT_DASH))
+                       return status_load_error(view, stage, newpath);
                if (status)
                        info = "Unstaged changes to %s";
                else
                        info = "Unstaged changes";
                break;
-
+       }
        case LINE_STAT_UNTRACKED:
-               if (opt_pipe)
-                       return REQ_QUIT;
-
-               if (!status) {
+               if (!newpath) {
                        report("No file to show");
                        return REQ_NONE;
                }
@@ -4209,7 +5615,8 @@ status_enter(struct view *view, struct line *line)
                        return REQ_NONE;
                }
 
-               opt_pipe = fopen(status->new.name, "r");
+               if (!prepare_update_file(stage, newpath))
+                       return status_load_error(view, stage, newpath);
                info = "Untracked file %s";
                break;
 
@@ -4221,7 +5628,7 @@ status_enter(struct view *view, struct line *line)
        }
 
        split = view_is_displayed(view) ? OPEN_SPLIT : 0;
-       open_view(view, REQ_VIEW_STAGE, OPEN_RELOAD | split);
+       open_view(view, REQ_VIEW_STAGE, OPEN_PREPARED | split);
        if (view_is_displayed(VIEW(REQ_VIEW_STAGE))) {
                if (status) {
                        stage_status = *status;
@@ -4241,54 +5648,59 @@ static bool
 status_exists(struct status *status, enum line_type type)
 {
        struct view *view = VIEW(REQ_VIEW_STATUS);
-       struct line *line;
+       unsigned long lineno;
 
-       for (line = view->line; line < view->line + view->lines; line++) {
+       for (lineno = 0; lineno < view->lines; lineno++) {
+               struct line *line = &view->line[lineno];
                struct status *pos = line->data;
 
-               if (line->type == type && pos &&
-                   !strcmp(status->new.name, pos->new.name))
+               if (line->type != type)
+                       continue;
+               if (!pos && (!status || !status->status) && line[1].data) {
+                       select_view_line(view, lineno);
+                       return TRUE;
+               }
+               if (pos && !strcmp(status->new.name, pos->new.name)) {
+                       select_view_line(view, lineno);
                        return TRUE;
+               }
        }
 
        return FALSE;
 }
 
 
-static FILE *
-status_update_prepare(enum line_type type)
+static bool
+status_update_prepare(struct io *io, enum line_type type)
 {
-       char cmd[SIZEOF_STR];
-       size_t cmdsize = 0;
-
-       if (opt_cdup[0] &&
-           type != LINE_STAT_UNTRACKED &&
-           !string_format_from(cmd, &cmdsize, "cd %s;", opt_cdup))
-               return NULL;
+       const char *staged_argv[] = {
+               "git", "update-index", "-z", "--index-info", NULL
+       };
+       const char *others_argv[] = {
+               "git", "update-index", "-z", "--add", "--remove", "--stdin", NULL
+       };
 
        switch (type) {
        case LINE_STAT_STAGED:
-               string_add(cmd, cmdsize, "git update-index -z --index-info");
-               break;
+               return run_io(io, staged_argv, opt_cdup, IO_WR);
 
        case LINE_STAT_UNSTAGED:
+               return run_io(io, others_argv, opt_cdup, IO_WR);
+
        case LINE_STAT_UNTRACKED:
-               string_add(cmd, cmdsize, "git update-index -z --add --remove --stdin");
-               break;
+               return run_io(io, others_argv, NULL, IO_WR);
 
        default:
                die("line type %d not handled in switch", type);
+               return FALSE;
        }
-
-       return popen(cmd, "w");
 }
 
 static bool
-status_update_write(FILE *pipe, struct status *status, enum line_type type)
+status_update_write(struct io *io, struct status *status, enum line_type type)
 {
        char buf[SIZEOF_STR];
        size_t bufsize = 0;
-       size_t written = 0;
 
        switch (type) {
        case LINE_STAT_STAGED:
@@ -4309,43 +5721,42 @@ status_update_write(FILE *pipe, struct status *status, enum line_type type)
                die("line type %d not handled in switch", type);
        }
 
-       while (!ferror(pipe) && written < bufsize) {
-               written += fwrite(buf + written, 1, bufsize - written, pipe);
-       }
-
-       return written == bufsize;
+       return io_write(io, buf, bufsize);
 }
 
 static bool
 status_update_file(struct status *status, enum line_type type)
 {
-       FILE *pipe = status_update_prepare(type);
+       struct io io = {};
        bool result;
 
-       if (!pipe)
+       if (!status_update_prepare(&io, type))
                return FALSE;
 
-       result = status_update_write(pipe, status, type);
-       pclose(pipe);
-       return result;
+       result = status_update_write(&io, status, type);
+       return done_io(&io) && result;
 }
 
 static bool
 status_update_files(struct view *view, struct line *line)
 {
-       FILE *pipe = status_update_prepare(line->type);
+       char buf[sizeof(view->ref)];
+       struct io io = {};
        bool result = TRUE;
        struct line *pos = view->line + view->lines;
        int files = 0;
        int file, done;
+       int cursor_y = -1, cursor_x = -1;
 
-       if (!pipe)
+       if (!status_update_prepare(&io, line->type))
                return FALSE;
 
        for (pos = line; pos < view->line + view->lines && pos->data; pos++)
                files++;
 
-       for (file = 0, done = 0; result && file < files; line++, file++) {
+       string_copy(buf, view->ref);
+       getsyx(cursor_y, cursor_x);
+       for (file = 0, done = 5; result && file < files; line++, file++) {
                int almost_done = file * 100 / files;
 
                if (almost_done > done) {
@@ -4353,12 +5764,14 @@ status_update_files(struct view *view, struct line *line)
                        string_format(view->ref, "updating file %u of %u (%d%% done)",
                                      file, files, done);
                        update_view_title(view);
+                       setsyx(cursor_y, cursor_x);
+                       doupdate();
                }
-               result = status_update_write(pipe, line->data, line->type);
+               result = status_update_write(&io, line->data, line->type);
        }
+       string_copy(view->ref, buf);
 
-       pclose(pipe);
-       return result;
+       return done_io(&io) && result;
 }
 
 static bool
@@ -4401,18 +5814,36 @@ status_revert(struct status *status, enum line_type type, bool has_none)
                } else {
                        report("Cannot revert changes to multiple files");
                }
-               return FALSE;
 
-       } else {
-               char cmd[SIZEOF_STR];
-               char file_sq[SIZEOF_STR];
+       } else if (prompt_yesno("Are you sure you want to revert changes?")) {
+               char mode[10] = "100644";
+               const char *reset_argv[] = {
+                       "git", "update-index", "--cacheinfo", mode,
+                               status->old.rev, status->old.name, NULL
+               };
+               const char *checkout_argv[] = {
+                       "git", "checkout", "--", status->old.name, NULL
+               };
+
+               if (status->status == 'U') {
+                       string_format(mode, "%5o", status->old.mode);
+
+                       if (status->old.mode == 0 && status->new.mode == 0) {
+                               reset_argv[2] = "--force-remove";
+                               reset_argv[3] = status->old.name;
+                               reset_argv[4] = NULL;
+                       }
 
-               if (sq_quote(file_sq, 0, status->old.name) >= sizeof(file_sq) ||
-                   !string_format(cmd, "git checkout -- %s%s", opt_cdup, file_sq))
-                       return FALSE;
+                       if (!run_io_fg(reset_argv, opt_cdup))
+                               return FALSE;
+                       if (status->old.mode == 0 && status->new.mode == 0)
+                               return TRUE;
+               }
 
-               return run_confirm(cmd, "Are you sure you want to overwrite any changes?");
+               return run_io_fg(checkout_argv, opt_cdup);
        }
+
+       return FALSE;
 }
 
 static enum request
@@ -4451,18 +5882,15 @@ status_request(struct view *view, enum request request, struct line *line)
                break;
 
        case REQ_VIEW_BLAME:
-               if (status) {
-                       string_copy(opt_file, status->new.name);
+               if (status)
                        opt_ref[0] = 0;
-               }
                return request;
 
        case REQ_ENTER:
                /* After returning the status view has been split to
                 * show the stage view. No further reloading is
                 * necessary. */
-               status_enter(view, line);
-               return REQ_NONE;
+               return status_enter(view, line);
 
        case REQ_REFRESH:
                /* Simply reload the view. */
@@ -4515,42 +5943,27 @@ status_select(struct view *view, struct line *line)
 
        if (status && status->status == 'U') {
                text = "Press %s to resolve conflict in %s";
-               key = get_key(REQ_STATUS_MERGE);
+               key = get_key(KEYMAP_STATUS, REQ_STATUS_MERGE);
 
        } else {
-               key = get_key(REQ_STATUS_UPDATE);
+               key = get_key(KEYMAP_STATUS, REQ_STATUS_UPDATE);
        }
 
        string_format(view->ref, text, key, file);
+       if (status)
+               string_copy(opt_file, status->new.name);
 }
 
 static bool
 status_grep(struct view *view, struct line *line)
 {
        struct status *status = line->data;
-       enum { S_STATUS, S_NAME, S_END } state;
-       char buf[2] = "?";
-       regmatch_t pmatch;
 
-       if (!status)
-               return FALSE;
-
-       for (state = S_STATUS; state < S_END; state++) {
-               const char *text;
-
-               switch (state) {
-               case S_NAME:    text = status->new.name;        break;
-               case S_STATUS:
-                       buf[0] = status->status;
-                       text = buf;
-                       break;
-
-               default:
-                       return FALSE;
-               }
+       if (status) {
+               const char buf[2] = { status->status, 0 };
+               const char *text[] = { status->new.name, buf, NULL };
 
-               if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
-                       return TRUE;
+               return grep_text(view, text);
        }
 
        return FALSE;
@@ -4558,6 +5971,7 @@ status_grep(struct view *view, struct line *line)
 
 static struct view_ops status_ops = {
        "file",
+       NULL,
        status_open,
        NULL,
        status_draw,
@@ -4568,27 +5982,13 @@ static struct view_ops status_ops = {
 
 
 static bool
-stage_diff_line(FILE *pipe, struct line *line)
-{
-       const char *buf = line->data;
-       size_t bufsize = strlen(buf);
-       size_t written = 0;
-
-       while (!ferror(pipe) && written < bufsize) {
-               written += fwrite(buf + written, 1, bufsize - written, pipe);
-       }
-
-       fputc('\n', pipe);
-
-       return written == bufsize;
-}
-
-static bool
-stage_diff_write(FILE *pipe, struct line *line, struct line *end)
+stage_diff_write(struct io *io, struct line *line, struct line *end)
 {
        while (line < end) {
-               if (!stage_diff_line(pipe, line++))
+               if (!io_write(io, line->data, strlen(line->data)) ||
+                   !io_write(io, "\n", 1))
                        return FALSE;
+               line++;
                if (line->type == LINE_DIFF_CHUNK ||
                    line->type == LINE_DIFF_HEADER)
                        break;
@@ -4610,35 +6010,32 @@ stage_diff_find(struct view *view, struct line *line, enum line_type type)
 static bool
 stage_apply_chunk(struct view *view, struct line *chunk, bool revert)
 {
-       char cmd[SIZEOF_STR];
-       size_t cmdsize = 0;
+       const char *apply_argv[SIZEOF_ARG] = {
+               "git", "apply", "--whitespace=nowarn", NULL
+       };
        struct line *diff_hdr;
-       FILE *pipe;
+       struct io io = {};
+       int argc = 3;
 
        diff_hdr = stage_diff_find(view, chunk, LINE_DIFF_HEADER);
        if (!diff_hdr)
                return FALSE;
 
-       if (opt_cdup[0] &&
-           !string_format_from(cmd, &cmdsize, "cd %s;", opt_cdup))
-               return FALSE;
-
-       if (!string_format_from(cmd, &cmdsize,
-                               "git apply --whitespace=nowarn %s %s - && "
-                               "git update-index -q --unmerged --refresh 2>/dev/null",
-                               revert ? "" : "--cached",
-                               revert || stage_line_type == LINE_STAT_STAGED ? "-R" : ""))
-               return FALSE;
-
-       pipe = popen(cmd, "w");
-       if (!pipe)
+       if (!revert)
+               apply_argv[argc++] = "--cached";
+       if (revert || stage_line_type == LINE_STAT_STAGED)
+               apply_argv[argc++] = "-R";
+       apply_argv[argc++] = "-";
+       apply_argv[argc++] = NULL;
+       if (!run_io(&io, apply_argv, opt_cdup, IO_WR))
                return FALSE;
 
-       if (!stage_diff_write(pipe, diff_hdr, chunk) ||
-           !stage_diff_write(pipe, chunk, view->line + view->lines))
+       if (!stage_diff_write(&io, diff_hdr, chunk) ||
+           !stage_diff_write(&io, chunk, view->line + view->lines))
                chunk = NULL;
 
-       pclose(pipe);
+       done_io(&io);
+       run_io_bg(update_index_argv);
 
        return chunk ? TRUE : FALSE;
 }
@@ -4708,21 +6105,15 @@ stage_next(struct view *view, struct line *line)
        int i;
 
        if (!stage_chunks) {
-               static size_t alloc = 0;
-               int *tmp;
-
                for (line = view->line; line < view->line + view->lines; line++) {
                        if (line->type != LINE_DIFF_CHUNK)
                                continue;
 
-                       tmp = realloc_items(stage_chunk, &alloc,
-                                           stage_chunks, sizeof(*tmp));
-                       if (!tmp) {
+                       if (!realloc_ints(&stage_chunk, stage_chunks, 1)) {
                                report("Allocation failure");
                                return;
                        }
 
-                       stage_chunk = tmp;
                        stage_chunk[stage_chunks++] = line - view->line;
                }
        }
@@ -4755,7 +6146,7 @@ stage_request(struct view *view, enum request request, struct line *line)
        case REQ_STAGE_NEXT:
                if (stage_line_type == LINE_STAT_UNTRACKED) {
                        report("File is untracked; press %s to add",
-                              get_key(REQ_STATUS_UPDATE));
+                              get_key(KEYMAP_STAGE, REQ_STATUS_UPDATE));
                        return REQ_NONE;
                }
                stage_next(view, line);
@@ -4790,12 +6181,15 @@ stage_request(struct view *view, enum request request, struct line *line)
                return request;
        }
 
-       open_view(view, REQ_VIEW_STATUS, OPEN_RELOAD | OPEN_NOMAXIMIZE);
+       VIEW(REQ_VIEW_STATUS)->p_restore = TRUE;
+       open_view(view, REQ_VIEW_STATUS, OPEN_REFRESH);
 
        /* Check whether the staged entry still exists, and close the
         * stage view if it doesn't. */
-       if (!status_exists(&stage_status, stage_line_type))
+       if (!status_exists(&stage_status, stage_line_type)) {
+               status_restore(VIEW(REQ_VIEW_STATUS));
                return REQ_VIEW_CLOSE;
+       }
 
        if (stage_line_type == LINE_STAT_UNTRACKED) {
                if (!suffixcmp(stage_status.new.name, -1, "/")) {
@@ -4803,7 +6197,10 @@ stage_request(struct view *view, enum request request, struct line *line)
                        return REQ_NONE;
                }
 
-               opt_pipe = fopen(stage_status.new.name, "r");
+               if (!prepare_update_file(view, stage_status.new.name)) {
+                       report("Failed to open file: %s", strerror(errno));
+                       return REQ_NONE;
+               }
        }
        open_view(view, REQ_VIEW_STAGE, OPEN_REFRESH);
 
@@ -4813,6 +6210,7 @@ stage_request(struct view *view, enum request request, struct line *line)
 static struct view_ops stage_ops = {
        "line",
        NULL,
+       NULL,
        pager_read,
        pager_draw,
        stage_request,
@@ -4828,9 +6226,9 @@ static struct view_ops stage_ops = {
 struct commit {
        char id[SIZEOF_REV];            /* SHA1 ID. */
        char title[128];                /* First line of the commit message. */
-       char author[75];                /* Author of the commit. */
-       struct tm time;                 /* Date from the author ident. */
-       struct ref **refs;              /* Repository references. */
+       const char *author;             /* Author of the commit. */
+       time_t time;                    /* Date from the author ident. */
+       struct ref_list *refs;          /* Repository references. */
        chtype graph[SIZEOF_REVGRAPH];  /* Ancestry chain graphics. */
        size_t graph_size;              /* The width of the graph array. */
        bool has_parents;               /* Rewritten --parents seen. */
@@ -5021,7 +6419,7 @@ prepare_rev_graph(struct rev_graph *graph)
 }
 
 static void
-update_rev_graph(struct rev_graph *graph)
+update_rev_graph(struct view *view, struct rev_graph *graph)
 {
        /* If this is the finalizing update ... */
        if (graph->commit)
@@ -5032,6 +6430,10 @@ update_rev_graph(struct rev_graph *graph)
        if (!graph->prev->commit)
                return;
 
+       if (view->lines > 2)
+               view->line[view->lines - 3].dirty = 1;
+       if (view->lines > 1)
+               view->line[view->lines - 2].dirty = 1;
        draw_rev_graph(graph->prev);
        done_rev_graph(graph->prev->prev);
 }
@@ -5041,19 +6443,23 @@ update_rev_graph(struct rev_graph *graph)
  * Main view backend
  */
 
+static const char *main_argv[SIZEOF_ARG] = {
+       "git", "log", "--no-color", "--pretty=raw", "--parents",
+                     "--topo-order", "%(head)", NULL
+};
+
 static bool
 main_draw(struct view *view, struct line *line, unsigned int lineno)
 {
        struct commit *commit = line->data;
 
-       if (!*commit->author)
+       if (!commit->author)
                return FALSE;
 
        if (opt_date && draw_date(view, &commit->time))
                return TRUE;
 
-       if (opt_author &&
-           draw_field(view, LINE_MAIN_AUTHOR, commit->author, opt_author_cols, TRUE))
+       if (opt_author && draw_author(view, commit->author))
                return TRUE;
 
        if (opt_rev_graph && commit->graph_size &&
@@ -5061,32 +6467,33 @@ main_draw(struct view *view, struct line *line, unsigned int lineno)
                return TRUE;
 
        if (opt_show_refs && commit->refs) {
-               size_t i = 0;
+               size_t i;
 
-               do {
+               for (i = 0; i < commit->refs->size; i++) {
+                       struct ref *ref = commit->refs->refs[i];
                        enum line_type type;
 
-                       if (commit->refs[i]->head)
+                       if (ref->head)
                                type = LINE_MAIN_HEAD;
-                       else if (commit->refs[i]->ltag)
+                       else if (ref->ltag)
                                type = LINE_MAIN_LOCAL_TAG;
-                       else if (commit->refs[i]->tag)
+                       else if (ref->tag)
                                type = LINE_MAIN_TAG;
-                       else if (commit->refs[i]->tracked)
+                       else if (ref->tracked)
                                type = LINE_MAIN_TRACKED;
-                       else if (commit->refs[i]->remote)
+                       else if (ref->remote)
                                type = LINE_MAIN_REMOTE;
                        else
                                type = LINE_MAIN_REF;
 
                        if (draw_text(view, type, "[", TRUE) ||
-                           draw_text(view, type, commit->refs[i]->name, TRUE) ||
+                           draw_text(view, type, ref->name, TRUE) ||
                            draw_text(view, type, "]", TRUE))
                                return TRUE;
 
                        if (draw_text(view, LINE_DEFAULT, " ", TRUE))
                                return TRUE;
-               } while (commit->refs[i++]->next);
+               }
        }
 
        draw_text(view, LINE_DEFAULT, commit->title, TRUE);
@@ -5108,13 +6515,14 @@ main_read(struct view *view, char *line)
                        die("No revisions match the given arguments.");
                if (view->lines > 0) {
                        commit = view->line[view->lines - 1].data;
-                       if (!*commit->author) {
+                       view->line[view->lines - 1].dirty = 1;
+                       if (!commit->author) {
                                view->lines--;
                                free(commit);
                                graph->commit = NULL;
                        }
                }
-               update_rev_graph(graph);
+               update_rev_graph(view, graph);
 
                for (i = 0; i < ARRAY_SIZE(graph_stacks); i++)
                        clear_rev_graph(&graph_stacks[i]);
@@ -5134,7 +6542,7 @@ main_read(struct view *view, char *line)
                }
 
                string_copy_rev(commit->id, line);
-               commit->refs = get_refs(commit->id);
+               commit->refs = get_ref_list(commit->id);
                graph->commit = commit;
                add_line_data(view, commit, LINE_MAIN_COMMIT);
 
@@ -5158,55 +6566,12 @@ main_read(struct view *view, char *line)
                break;
 
        case LINE_AUTHOR:
-       {
-               /* Parse author lines where the name may be empty:
-                *      author  <email@address.tld> 1138474660 +0100
-                */
-               char *ident = line + STRING_SIZE("author ");
-               char *nameend = strchr(ident, '<');
-               char *emailend = strchr(ident, '>');
-
-               if (!nameend || !emailend)
-                       break;
-
-               update_rev_graph(graph);
+               parse_author_line(line + STRING_SIZE("author "),
+                                 &commit->author, &commit->time);
+               update_rev_graph(view, graph);
                graph = graph->next;
-
-               *nameend = *emailend = 0;
-               ident = chomp_string(ident);
-               if (!*ident) {
-                       ident = chomp_string(nameend + 1);
-                       if (!*ident)
-                               ident = "Unknown";
-               }
-
-               string_ncopy(commit->author, ident, strlen(ident));
-
-               /* Parse epoch and timezone */
-               if (emailend[1] == ' ') {
-                       char *secs = emailend + 2;
-                       char *zone = strchr(secs, ' ');
-                       time_t time = (time_t) atol(secs);
-
-                       if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
-                               long tz;
-
-                               zone++;
-                               tz  = ('0' - zone[1]) * 60 * 60 * 10;
-                               tz += ('0' - zone[2]) * 60 * 60;
-                               tz += ('0' - zone[3]) * 60;
-                               tz += ('0' - zone[4]) * 60;
-
-                               if (zone[0] == '-')
-                                       tz = -tz;
-
-                               time -= tz;
-                       }
-
-                       gmtime_r(&time, &commit->time);
-               }
                break;
-       }
+
        default:
                /* Fill in the commit title if it has not already been set. */
                if (commit->title[0])
@@ -5226,7 +6591,8 @@ main_read(struct view *view, char *line)
                /* FIXME: More graceful handling of titles; append "..." to
                 * shortened titles, etc. */
 
-               string_ncopy(commit->title, line, strlen(line));
+               string_expand(commit->title, sizeof(commit->title), line, 1);
+               view->line[view->lines - 1].dirty = 1;
        }
 
        return TRUE;
@@ -5253,17 +6619,18 @@ main_request(struct view *view, enum request request, struct line *line)
 }
 
 static bool
-grep_refs(struct ref **refs, regex_t *regex)
+grep_refs(struct ref_list *list, regex_t *regex)
 {
        regmatch_t pmatch;
-       size_t i = 0;
+       size_t i;
 
-       if (!refs)
+       if (!opt_show_refs || !list)
                return FALSE;
-       do {
-               if (regexec(regex, refs[i]->name, 1, &pmatch, 0) != REG_NOMATCH)
+
+       for (i = 0; i < list->size; i++) {
+               if (regexec(regex, list->refs[i]->name, 1, &pmatch, 0) != REG_NOMATCH)
                        return TRUE;
-       } while (refs[i++]->next);
+       }
 
        return FALSE;
 }
@@ -5272,42 +6639,14 @@ static bool
 main_grep(struct view *view, struct line *line)
 {
        struct commit *commit = line->data;
-       enum { S_TITLE, S_AUTHOR, S_DATE, S_REFS, S_END } state;
-       char buf[DATE_COLS + 1];
-       regmatch_t pmatch;
-
-       for (state = S_TITLE; state < S_END; state++) {
-               char *text;
-
-               switch (state) {
-               case S_TITLE:   text = commit->title;   break;
-               case S_AUTHOR:
-                       if (!opt_author)
-                               continue;
-                       text = commit->author;
-                       break;
-               case S_DATE:
-                       if (!opt_date)
-                               continue;
-                       if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
-                               continue;
-                       text = buf;
-                       break;
-               case S_REFS:
-                       if (!opt_show_refs)
-                               continue;
-                       if (grep_refs(commit->refs, view->regex) == TRUE)
-                               return TRUE;
-                       continue;
-               default:
-                       return FALSE;
-               }
-
-               if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
-                       return TRUE;
-       }
+       const char *text[] = {
+               commit->title,
+               opt_author ? commit->author : "",
+               opt_date ? mkdate(&commit->time) : "",
+               NULL
+       };
 
-       return FALSE;
+       return grep_text(view, text) || grep_refs(commit->refs, view->regex);
 }
 
 static void
@@ -5321,6 +6660,7 @@ main_select(struct view *view, struct line *line)
 
 static struct view_ops main_ops = {
        "commit",
+       main_argv,
        NULL,
        main_read,
        main_draw,
@@ -5333,15 +6673,11 @@ static struct view_ops main_ops = {
 /*
  * Unicode / UTF-8 handling
  *
- * NOTE: Much of the following code for dealing with unicode is derived from
+ * NOTE: Much of the following code for dealing with Unicode is derived from
  * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
- * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
+ * src/intl/charset.c from the UTF-8 branch commit elinks-0.11.0-g31f2c28.
  */
 
-/* I've (over)annotated a lot of code snippets because I am not entirely
- * confident that the approach taken by this small UTF-8 interface is correct.
- * --jonas */
-
 static inline int
 unicode_width(unsigned long c)
 {
@@ -5379,7 +6715,7 @@ static const unsigned char utf8_bytes[256] = {
        3,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4, 5,5,5,5,6,6,1,1,
 };
 
-/* Decode UTF-8 multi-byte representation into a unicode character. */
+/* Decode UTF-8 multi-byte representation into a Unicode character. */
 static inline unsigned long
 utf8_to_unicode(const char *string, size_t length)
 {
@@ -5420,7 +6756,7 @@ utf8_to_unicode(const char *string, size_t length)
                unicode +=  (string[5] & 0x3f);
                break;
        default:
-               die("Invalid unicode length");
+               die("Invalid Unicode length");
        }
 
        /* Invalid characters could return the special 0xfffd value but NUL
@@ -5435,9 +6771,9 @@ utf8_to_unicode(const char *string, size_t length)
  *
  * Returns the number of bytes to output from string to satisfy max_width. */
 static size_t
-utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool reserve)
+utf8_length(const char **start, size_t skip, int *width, size_t max_width, int *trimmed, bool reserve)
 {
-       const char *start = string;
+       const char *string = *start;
        const char *end = strchr(string, '\0');
        unsigned char last_bytes = 0;
        size_t last_ucwidth = 0;
@@ -5458,11 +6794,15 @@ utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool
                 * it is a single- or double-width character. */
 
                unicode = utf8_to_unicode(string, bytes);
-               /* FIXME: Graceful handling of invalid unicode character. */
+               /* FIXME: Graceful handling of invalid Unicode character. */
                if (!unicode)
                        break;
 
                ucwidth = unicode_width(unicode);
+               if (skip > 0) {
+                       skip -= ucwidth <= skip ? ucwidth : skip;
+                       *start += bytes;
+               }
                *width  += ucwidth;
                if (*width > max_width) {
                        *trimmed = 1;
@@ -5475,11 +6815,11 @@ utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool
                }
 
                string  += bytes;
-               last_bytes = bytes;
+               last_bytes = ucwidth ? bytes : 0;
                last_ucwidth = ucwidth;
        }
 
-       return string - start;
+       return string - *start;
 }
 
 
@@ -5490,10 +6830,17 @@ utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool
 /* Whether or not the curses interface has been initialized. */
 static bool cursed = FALSE;
 
+/* Terminal hacks and workarounds. */
+static bool use_scroll_redrawwin;
+static bool use_scroll_status_wclear;
+
 /* The status window is used for polling keystrokes. */
 static WINDOW *status_win;
 
-static bool status_empty = TRUE;
+/* Reading from the prompt? */
+static bool input_mode = FALSE;
+
+static bool status_empty = FALSE;
 
 /* Update status and title window. */
 static void
@@ -5525,6 +6872,8 @@ report(const char *msg, ...)
                va_start(args, msg);
 
                wmove(status_win, 0, 0);
+               if (view->has_scrolled && use_scroll_status_wclear)
+                       wclear(status_win);
                if (*msg) {
                        vwprintw(status_win, msg, args);
                        status_empty = FALSE;
@@ -5532,13 +6881,12 @@ report(const char *msg, ...)
                        status_empty = TRUE;
                }
                wclrtoeol(status_win);
-               wrefresh(status_win);
+               wnoutrefresh(status_win);
 
                va_end(args);
        }
 
        update_view_title(view);
-       update_display_cursor(view);
 }
 
 /* Controls when nodelay should be in effect when polling user input. */
@@ -5555,6 +6903,7 @@ set_nonblocking_input(bool loading)
 static void
 init_display(void)
 {
+       const char *term;
        int x, y;
 
        /* Initialize the curses library */
@@ -5572,10 +6921,10 @@ init_display(void)
        if (!cursed)
                die("Failed to initialize curses");
 
-       nonl();         /* Tell curses not to do NL->CR/NL on output */
+       nonl();         /* Disable conversion and detect newlines from input. */
        cbreak();       /* Take input chars one at a time, no wait for \n */
        noecho();       /* Don't echo input */
-       leaveok(stdscr, TRUE);
+       leaveok(stdscr, FALSE);
 
        if (has_colors())
                init_colors();
@@ -5593,50 +6942,128 @@ init_display(void)
        if (opt_line_graphics) {
                line_graphics[LINE_GRAPHIC_VLINE] = ACS_VLINE;
        }
+
+       term = getenv("XTERM_VERSION") ? NULL : getenv("COLORTERM");
+       if (term && !strcmp(term, "gnome-terminal")) {
+               /* In the gnome-terminal-emulator, the message from
+                * scrolling up one line when impossible followed by
+                * scrolling down one line causes corruption of the
+                * status line. This is fixed by calling wclear. */
+               use_scroll_status_wclear = TRUE;
+               use_scroll_redrawwin = FALSE;
+
+       } else if (term && !strcmp(term, "xrvt-xpm")) {
+               /* No problems with full optimizations in xrvt-(unicode)
+                * and aterm. */
+               use_scroll_status_wclear = use_scroll_redrawwin = FALSE;
+
+       } else {
+               /* When scrolling in (u)xterm the last line in the
+                * scrolling direction will update slowly. */
+               use_scroll_redrawwin = TRUE;
+               use_scroll_status_wclear = FALSE;
+       }
 }
 
-static bool
-prompt_yesno(const char *prompt)
+static int
+get_input(int prompt_position)
 {
-       enum { WAIT, STOP, CANCEL  } status = WAIT;
-       bool answer = FALSE;
-
-       while (status == WAIT) {
-               struct view *view;
-               int i, key;
+       struct view *view;
+       int i, key, cursor_y, cursor_x;
 
+       if (prompt_position)
                input_mode = TRUE;
 
-               foreach_view (view, i)
+       while (TRUE) {
+               foreach_view (view, i) {
                        update_view(view);
+                       if (view_is_displayed(view) && view->has_scrolled &&
+                           use_scroll_redrawwin)
+                               redrawwin(view->win);
+                       view->has_scrolled = FALSE;
+               }
 
-               input_mode = FALSE;
-
-               mvwprintw(status_win, 0, 0, "%s [Yy]/[Nn]", prompt);
-               wclrtoeol(status_win);
+               /* Update the cursor position. */
+               if (prompt_position) {
+                       getbegyx(status_win, cursor_y, cursor_x);
+                       cursor_x = prompt_position;
+               } else {
+                       view = display[current_view];
+                       getbegyx(view->win, cursor_y, cursor_x);
+                       cursor_x = view->width - 1;
+                       cursor_y += view->lineno - view->offset;
+               }
+               setsyx(cursor_y, cursor_x);
 
                /* Refresh, accept single keystroke of input */
+               doupdate();
                key = wgetch(status_win);
+
+               /* wgetch() with nodelay() enabled returns ERR when
+                * there's no input. */
+               if (key == ERR) {
+
+               } else if (key == KEY_RESIZE) {
+                       int height, width;
+
+                       getmaxyx(stdscr, height, width);
+
+                       wresize(status_win, 1, width);
+                       mvwin(status_win, height - 1, 0);
+                       wnoutrefresh(status_win);
+                       resize_display();
+                       redraw_display(TRUE);
+
+               } else {
+                       input_mode = FALSE;
+                       return key;
+               }
+       }
+}
+
+static char *
+prompt_input(const char *prompt, input_handler handler, void *data)
+{
+       enum input_status status = INPUT_OK;
+       static char buf[SIZEOF_STR];
+       size_t pos = 0;
+
+       buf[pos] = 0;
+
+       while (status == INPUT_OK || status == INPUT_SKIP) {
+               int key;
+
+               mvwprintw(status_win, 0, 0, "%s%.*s", prompt, pos, buf);
+               wclrtoeol(status_win);
+
+               key = get_input(pos + 1);
                switch (key) {
-               case ERR:
+               case KEY_RETURN:
+               case KEY_ENTER:
+               case '\n':
+                       status = pos ? INPUT_STOP : INPUT_CANCEL;
                        break;
 
-               case 'y':
-               case 'Y':
-                       answer = TRUE;
-                       status = STOP;
+               case KEY_BACKSPACE:
+                       if (pos > 0)
+                               buf[--pos] = 0;
+                       else
+                               status = INPUT_CANCEL;
                        break;
 
                case KEY_ESC:
-               case KEY_RETURN:
-               case KEY_ENTER:
-               case KEY_BACKSPACE:
-               case 'n':
-               case 'N':
-               case '\n':
+                       status = INPUT_CANCEL;
+                       break;
+
                default:
-                       answer = FALSE;
-                       status = CANCEL;
+                       if (pos >= sizeof(buf)) {
+                               report("Input string too long");
+                               return NULL;
+                       }
+
+                       status = handler(data, buf, key);
+                       if (status == INPUT_OK)
+                               buf[pos++] = (char) key;
                }
        }
 
@@ -5644,61 +7071,98 @@ prompt_yesno(const char *prompt)
        status_empty = FALSE;
        report("");
 
-       return answer;
+       if (status == INPUT_CANCEL)
+               return NULL;
+
+       buf[pos++] = 0;
+
+       return buf;
+}
+
+static enum input_status
+prompt_yesno_handler(void *data, char *buf, int c)
+{
+       if (c == 'y' || c == 'Y')
+               return INPUT_STOP;
+       if (c == 'n' || c == 'N')
+               return INPUT_CANCEL;
+       return INPUT_SKIP;
+}
+
+static bool
+prompt_yesno(const char *prompt)
+{
+       char prompt2[SIZEOF_STR];
+
+       if (!string_format(prompt2, "%s [Yy/Nn]", prompt))
+               return FALSE;
+
+       return !!prompt_input(prompt2, prompt_yesno_handler, NULL);
+}
+
+static enum input_status
+read_prompt_handler(void *data, char *buf, int c)
+{
+       return isprint(c) ? INPUT_OK : INPUT_SKIP;
 }
 
 static char *
 read_prompt(const char *prompt)
 {
-       enum { READING, STOP, CANCEL } status = READING;
-       static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
-       int pos = 0;
-
-       while (status == READING) {
-               struct view *view;
-               int i, key;
+       return prompt_input(prompt, read_prompt_handler, NULL);
+}
 
-               input_mode = TRUE;
+static bool prompt_menu(const char *prompt, const struct menu_item *items, int *selected)
+{
+       enum input_status status = INPUT_OK;
+       int size = 0;
 
-               foreach_view (view, i)
-                       update_view(view);
+       while (items[size].text)
+               size++;
 
-               input_mode = FALSE;
+       while (status == INPUT_OK) {
+               const struct menu_item *item = &items[*selected];
+               int key;
+               int i;
 
-               mvwprintw(status_win, 0, 0, "%s%.*s", prompt, pos, buf);
+               mvwprintw(status_win, 0, 0, "%s (%d of %d) ",
+                         prompt, *selected + 1, size);
+               if (item->hotkey)
+                       wprintw(status_win, "[%c] ", (char) item->hotkey);
+               wprintw(status_win, "%s", item->text);
                wclrtoeol(status_win);
 
-               /* Refresh, accept single keystroke of input */
-               key = wgetch(status_win);
+               key = get_input(COLS - 1);
                switch (key) {
                case KEY_RETURN:
                case KEY_ENTER:
                case '\n':
-                       status = pos ? STOP : CANCEL;
+                       status = INPUT_STOP;
                        break;
 
-               case KEY_BACKSPACE:
-                       if (pos > 0)
-                               pos--;
-                       else
-                               status = CANCEL;
+               case KEY_LEFT:
+               case KEY_UP:
+                       *selected = *selected - 1;
+                       if (*selected < 0)
+                               *selected = size - 1;
                        break;
 
-               case KEY_ESC:
-                       status = CANCEL;
+               case KEY_RIGHT:
+               case KEY_DOWN:
+                       *selected = (*selected + 1) % size;
                        break;
 
-               case ERR:
+               case KEY_ESC:
+                       status = INPUT_CANCEL;
                        break;
 
                default:
-                       if (pos >= sizeof(buf)) {
-                               report("Input string too long");
-                               return NULL;
-                       }
-
-                       if (isprint(key))
-                               buf[pos++] = (char) key;
+                       for (i = 0; items[i].text; i++)
+                               if (items[i].hotkey == key) {
+                                       *selected = i;
+                                       status = INPUT_STOP;
+                                       break;
+                               }
                }
        }
 
@@ -5706,26 +7170,22 @@ read_prompt(const char *prompt)
        status_empty = FALSE;
        report("");
 
-       if (status == CANCEL)
-               return NULL;
-
-       buf[pos++] = 0;
-
-       return buf;
+       return status != INPUT_CANCEL;
 }
 
 /*
- * Repository references
+ * Repository properties
  */
 
-static struct ref *refs = NULL;
-static size_t refs_alloc = 0;
+static struct ref **refs = NULL;
 static size_t refs_size = 0;
 
-/* Id <-> ref store */
-static struct ref ***id_refs = NULL;
-static size_t id_refs_alloc = 0;
-static size_t id_refs_size = 0;
+static struct ref_list **ref_lists = NULL;
+static size_t ref_lists_size = 0;
+
+DEFINE_ALLOCATOR(realloc_refs, struct ref *, 256)
+DEFINE_ALLOCATOR(realloc_refs_list, struct ref *, 8)
+DEFINE_ALLOCATOR(realloc_ref_lists, struct ref_list *, 8)
 
 static int
 compare_refs(const void *ref1_, const void *ref2_)
@@ -5746,76 +7206,63 @@ compare_refs(const void *ref1_, const void *ref2_)
        return strcmp(ref1->name, ref2->name);
 }
 
-static struct ref **
-get_refs(const char *id)
+static void
+foreach_ref(bool (*visitor)(void *data, const struct ref *ref), void *data)
 {
-       struct ref ***tmp_id_refs;
-       struct ref **ref_list = NULL;
-       size_t ref_list_alloc = 0;
-       size_t ref_list_size = 0;
        size_t i;
 
-       for (i = 0; i < id_refs_size; i++)
-               if (!strcmp(id, id_refs[i][0]->id))
-                       return id_refs[i];
-
-       tmp_id_refs = realloc_items(id_refs, &id_refs_alloc, id_refs_size + 1,
-                                   sizeof(*id_refs));
-       if (!tmp_id_refs)
-               return NULL;
-
-       id_refs = tmp_id_refs;
-
-       for (i = 0; i < refs_size; i++) {
-               struct ref **tmp;
+       for (i = 0; i < refs_size; i++)
+               if (!visitor(data, refs[i]))
+                       break;
+}
 
-               if (strcmp(id, refs[i].id))
-                       continue;
+static struct ref_list *
+get_ref_list(const char *id)
+{
+       struct ref_list *list;
+       size_t i;
 
-               tmp = realloc_items(ref_list, &ref_list_alloc,
-                                   ref_list_size + 1, sizeof(*ref_list));
-               if (!tmp) {
-                       if (ref_list)
-                               free(ref_list);
-                       return NULL;
-               }
+       for (i = 0; i < ref_lists_size; i++)
+               if (!strcmp(id, ref_lists[i]->id))
+                       return ref_lists[i];
 
-               ref_list = tmp;
-               ref_list[ref_list_size] = &refs[i];
-               /* XXX: The properties of the commit chains ensures that we can
-                * safely modify the shared ref. The repo references will
-                * always be similar for the same id. */
-               ref_list[ref_list_size]->next = 1;
+       if (!realloc_ref_lists(&ref_lists, ref_lists_size, 1))
+               return NULL;
+       list = calloc(1, sizeof(*list));
+       if (!list)
+               return NULL;
 
-               ref_list_size++;
+       for (i = 0; i < refs_size; i++) {
+               if (!strcmp(id, refs[i]->id) &&
+                   realloc_refs_list(&list->refs, list->size, 1))
+                       list->refs[list->size++] = refs[i];
        }
 
-       if (ref_list) {
-               qsort(ref_list, ref_list_size, sizeof(*ref_list), compare_refs);
-               ref_list[ref_list_size - 1]->next = 0;
-               id_refs[id_refs_size++] = ref_list;
+       if (!list->refs) {
+               free(list);
+               return NULL;
        }
 
-       return ref_list;
+       qsort(list->refs, list->size, sizeof(*list->refs), compare_refs);
+       ref_lists[ref_lists_size++] = list;
+       return list;
 }
 
 static int
 read_ref(char *id, size_t idlen, char *name, size_t namelen)
 {
-       struct ref *ref;
+       struct ref *ref = NULL;
        bool tag = FALSE;
        bool ltag = FALSE;
        bool remote = FALSE;
        bool tracked = FALSE;
-       bool check_replace = FALSE;
        bool head = FALSE;
+       int from = 0, to = refs_size - 1;
 
        if (!prefixcmp(name, "refs/tags/")) {
                if (!suffixcmp(name, namelen, "^{}")) {
                        namelen -= 3;
                        name[namelen] = 0;
-                       if (refs_size > 0 && refs[refs_size - 1].ltag == TRUE)
-                               check_replace = TRUE;
                } else {
                        ltag = TRUE;
                }
@@ -5840,27 +7287,38 @@ read_ref(char *id, size_t idlen, char *name, size_t namelen)
                return OK;
        }
 
-       if (check_replace && !strcmp(name, refs[refs_size - 1].name)) {
-               /* it's an annotated tag, replace the previous sha1 with the
-                * resolved commit id; relies on the fact git-ls-remote lists
-                * the commit id of an annotated tag right before the commit id
-                * it points to. */
-               refs[refs_size - 1].ltag = ltag;
-               string_copy_rev(refs[refs_size - 1].id, id);
+       /* If we are reloading or it's an annotated tag, replace the
+        * previous SHA1 with the resolved commit id; relies on the fact
+        * git-ls-remote lists the commit id of an annotated tag right
+        * before the commit id it points to. */
+       while (from <= to) {
+               size_t pos = (to + from) / 2;
+               int cmp = strcmp(name, refs[pos]->name);
 
-               return OK;
+               if (!cmp) {
+                       ref = refs[pos];
+                       break;
+               }
+
+               if (cmp < 0)
+                       to = pos - 1;
+               else
+                       from = pos + 1;
        }
-       refs = realloc_items(refs, &refs_alloc, refs_size + 1, sizeof(*refs));
-       if (!refs)
-               return ERR;
 
-       ref = &refs[refs_size++];
-       ref->name = malloc(namelen + 1);
-       if (!ref->name)
-               return ERR;
+       if (!ref) {
+               if (!realloc_refs(&refs, refs_size, 1))
+                       return ERR;
+               ref = calloc(1, sizeof(*ref) + namelen);
+               if (!ref)
+                       return ERR;
+               memmove(refs + from + 1, refs + from,
+                       (refs_size - from) * sizeof(*refs));
+               refs[from] = ref;
+               strncpy(ref->name, name, namelen);
+               refs_size++;
+       }
 
-       strncpy(ref->name, name, namelen);
-       ref->name[namelen] = 0;
        ref->head = head;
        ref->tag = tag;
        ref->ltag = ltag;
@@ -5874,18 +7332,119 @@ read_ref(char *id, size_t idlen, char *name, size_t namelen)
 static int
 load_refs(void)
 {
-       const char *cmd_env = getenv("TIG_LS_REMOTE");
-       const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
+       const char *head_argv[] = {
+               "git", "symbolic-ref", "HEAD", NULL
+       };
+       static const char *ls_remote_argv[SIZEOF_ARG] = {
+               "git", "ls-remote", opt_git_dir, NULL
+       };
+       static bool init = FALSE;
+       size_t i;
+
+       if (!init) {
+               argv_from_env(ls_remote_argv, "TIG_LS_REMOTE");
+               init = TRUE;
+       }
 
        if (!*opt_git_dir)
                return OK;
 
-       while (refs_size > 0)
-               free(refs[--refs_size].name);
-       while (id_refs_size > 0)
-               free(id_refs[--id_refs_size]);
+       if (run_io_buf(head_argv, opt_head, sizeof(opt_head)) &&
+           !prefixcmp(opt_head, "refs/heads/")) {
+               char *offset = opt_head + STRING_SIZE("refs/heads/");
 
-       return read_properties(popen(cmd, "r"), "\t", read_ref);
+               memmove(opt_head, offset, strlen(offset) + 1);
+       }
+
+       for (i = 0; i < refs_size; i++)
+               refs[i]->id[0] = 0;
+
+       if (run_io_load(ls_remote_argv, "\t", read_ref) == ERR)
+               return ERR;
+
+       /* Update the ref lists to reflect changes. */
+       for (i = 0; i < ref_lists_size; i++) {
+               struct ref_list *list = ref_lists[i];
+               size_t old, new;
+
+               for (old = new = 0; old < list->size; old++)
+                       if (!strcmp(list->id, list->refs[old]->id))
+                               list->refs[new++] = list->refs[old];
+               list->size = new;
+       }
+
+       return OK;
+}
+
+static void
+set_remote_branch(const char *name, const char *value, size_t valuelen)
+{
+       if (!strcmp(name, ".remote")) {
+               string_ncopy(opt_remote, value, valuelen);
+
+       } else if (*opt_remote && !strcmp(name, ".merge")) {
+               size_t from = strlen(opt_remote);
+
+               if (!prefixcmp(value, "refs/heads/"))
+                       value += STRING_SIZE("refs/heads/");
+
+               if (!string_format_from(opt_remote, &from, "/%s", value))
+                       opt_remote[0] = 0;
+       }
+}
+
+static void
+set_repo_config_option(char *name, char *value, int (*cmd)(int, const char **))
+{
+       const char *argv[SIZEOF_ARG] = { name, "=" };
+       int argc = 1 + (cmd == option_set_command);
+       int error = ERR;
+
+       if (!argv_from_string(argv, &argc, value))
+               config_msg = "Too many option arguments";
+       else
+               error = cmd(argc, argv);
+
+       if (error == ERR)
+               warn("Option 'tig.%s': %s", name, config_msg);
+}
+
+static bool
+set_environment_variable(const char *name, const char *value)
+{
+       size_t len = strlen(name) + 1 + strlen(value) + 1;
+       char *env = malloc(len);
+
+       if (env &&
+           string_nformat(env, len, NULL, "%s=%s", name, value) &&
+           putenv(env) == 0)
+               return TRUE;
+       free(env);
+       return FALSE;
+}
+
+static void
+set_work_tree(const char *value)
+{
+       char cwd[SIZEOF_STR];
+
+       if (!getcwd(cwd, sizeof(cwd)))
+               die("Failed to get cwd path: %s", strerror(errno));
+       if (chdir(opt_git_dir) < 0)
+               die("Failed to chdir(%s): %s", strerror(errno));
+       if (!getcwd(opt_git_dir, sizeof(opt_git_dir)))
+               die("Failed to get git path: %s", strerror(errno));
+       if (chdir(cwd) < 0)
+               die("Failed to chdir(%s): %s", cwd, strerror(errno));
+       if (chdir(value) < 0)
+               die("Failed to chdir(%s): %s", value, strerror(errno));
+       if (!getcwd(cwd, sizeof(cwd)))
+               die("Failed to get cwd path: %s", strerror(errno));
+       if (!set_environment_variable("GIT_WORK_TREE", cwd))
+               die("Failed to set GIT_WORK_TREE to '%s'", cwd);
+       if (!set_environment_variable("GIT_DIR", opt_git_dir))
+               die("Failed to set GIT_DIR to '%s'", opt_git_dir);
+       opt_is_inside_work_tree = TRUE;
 }
 
 static int
@@ -5894,30 +7453,24 @@ read_repo_config_option(char *name, size_t namelen, char *value, size_t valuelen
        if (!strcmp(name, "i18n.commitencoding"))
                string_ncopy(opt_encoding, value, valuelen);
 
-       if (!strcmp(name, "core.editor"))
+       else if (!strcmp(name, "core.editor"))
                string_ncopy(opt_editor, value, valuelen);
 
-       /* branch.<head>.remote */
-       if (*opt_head &&
-           !strncmp(name, "branch.", 7) &&
-           !strncmp(name + 7, opt_head, strlen(opt_head)) &&
-           !strcmp(name + 7 + strlen(opt_head), ".remote"))
-               string_ncopy(opt_remote, value, valuelen);
+       else if (!strcmp(name, "core.worktree"))
+               set_work_tree(value);
 
-       if (*opt_head && *opt_remote &&
-           !strncmp(name, "branch.", 7) &&
-           !strncmp(name + 7, opt_head, strlen(opt_head)) &&
-           !strcmp(name + 7 + strlen(opt_head), ".merge")) {
-               size_t from = strlen(opt_remote);
+       else if (!prefixcmp(name, "tig.color."))
+               set_repo_config_option(name + 10, value, option_color_command);
 
-               if (!prefixcmp(value, "refs/heads/")) {
-                       value += STRING_SIZE("refs/heads/");
-                       valuelen -= STRING_SIZE("refs/heads/");
-               }
+       else if (!prefixcmp(name, "tig.bind."))
+               set_repo_config_option(name + 9, value, option_bind_command);
 
-               if (!string_format_from(opt_remote, &from, "/%s", value))
-                       opt_remote[0] = 0;
-       }
+       else if (!prefixcmp(name, "tig."))
+               set_repo_config_option(name + 4, value, option_set_command);
+
+       else if (*opt_head && !prefixcmp(name, "branch.") &&
+                !strncmp(name + 7, opt_head, strlen(opt_head)))
+               set_remote_branch(name + 7 + strlen(opt_head), value, valuelen);
 
        return OK;
 }
@@ -5925,8 +7478,9 @@ read_repo_config_option(char *name, size_t namelen, char *value, size_t valuelen
 static int
 load_git_config(void)
 {
-       return read_properties(popen("git " GIT_CONFIG " --list", "r"),
-                              "=", read_repo_config_option);
+       const char *config_list_argv[] = { "git", "config", "--list", NULL };
+
+       return run_io_load(config_list_argv, "=", read_repo_config_option);
 }
 
 static int
@@ -5943,14 +7497,11 @@ read_repo_info(char *name, size_t namelen, char *value, size_t valuelen)
                 * Default to true for the unknown case. */
                opt_is_inside_work_tree = strcmp(name, "false") ? TRUE : FALSE;
 
-       } else if (opt_cdup[0] == ' ') {
+       } else if (*name == '.') {
                string_ncopy(opt_cdup, name, namelen);
+
        } else {
-               if (!prefixcmp(name, "refs/heads/")) {
-                       namelen -= STRING_SIZE("refs/heads/");
-                       name    += STRING_SIZE("refs/heads/");
-                       string_ncopy(opt_head, name, namelen);
-               }
+               string_ncopy(opt_prefix, name, namelen);
        }
 
        return OK;
@@ -5959,60 +7510,12 @@ read_repo_info(char *name, size_t namelen, char *value, size_t valuelen)
 static int
 load_repo_info(void)
 {
-       int result;
-       FILE *pipe = popen("(git rev-parse --git-dir --is-inside-work-tree "
-                          " --show-cdup; git symbolic-ref HEAD) 2>/dev/null", "r");
-
-       /* XXX: The line outputted by "--show-cdup" can be empty so
-        * initialize it to something invalid to make it possible to
-        * detect whether it has been set or not. */
-       opt_cdup[0] = ' ';
-
-       result = read_properties(pipe, "=", read_repo_info);
-       if (opt_cdup[0] == ' ')
-               opt_cdup[0] = 0;
-
-       return result;
-}
-
-static int
-read_properties(FILE *pipe, const char *separators,
-               int (*read_property)(char *, size_t, char *, size_t))
-{
-       char buffer[BUFSIZ];
-       char *name;
-       int state = OK;
-
-       if (!pipe)
-               return ERR;
-
-       while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
-               char *value;
-               size_t namelen;
-               size_t valuelen;
-
-               name = chomp_string(name);
-               namelen = strcspn(name, separators);
-
-               if (name[namelen]) {
-                       name[namelen] = 0;
-                       value = chomp_string(name + namelen + 1);
-                       valuelen = strlen(value);
-
-               } else {
-                       value = "";
-                       valuelen = 0;
-               }
-
-               state = read_property(name, namelen, value, valuelen);
-       }
-
-       if (state != ERR && ferror(pipe))
-               state = ERR;
-
-       pclose(pipe);
+       const char *rev_parse_argv[] = {
+               "git", "rev-parse", "--git-dir", "--is-inside-work-tree",
+                       "--show-cdup", "--show-prefix", NULL
+       };
 
-       return state;
+       return run_io_load(rev_parse_argv, "=", read_repo_info);
 }
 
 
@@ -6020,6 +7523,19 @@ read_properties(FILE *pipe, const char *separators,
  * Main
  */
 
+static const char usage[] =
+"tig " TIG_VERSION " (" __DATE__ ")\n"
+"\n"
+"Usage: tig        [options] [revs] [--] [paths]\n"
+"   or: tig show   [options] [revs] [--] [paths]\n"
+"   or: tig blame  [rev] path\n"
+"   or: tig status\n"
+"   or: tig <      [git command output]\n"
+"\n"
+"Options:\n"
+"  -v, --version   Show version and exit\n"
+"  -h, --help      Show help message and exit";
+
 static void __NORETURN
 quit(int sig)
 {
@@ -6057,14 +7573,94 @@ warn(const char *msg, ...)
        va_end(args);
 }
 
+static enum request
+parse_options(int argc, const char *argv[])
+{
+       enum request request = REQ_VIEW_MAIN;
+       const char *subcommand;
+       bool seen_dashdash = FALSE;
+       /* XXX: This is vulnerable to the user overriding options
+        * required for the main view parser. */
+       const char *custom_argv[SIZEOF_ARG] = {
+               "git", "log", "--no-color", "--pretty=raw", "--parents",
+                       "--topo-order", NULL
+       };
+       int i, j = 6;
+
+       if (!isatty(STDIN_FILENO)) {
+               io_open(&VIEW(REQ_VIEW_PAGER)->io, "");
+               return REQ_VIEW_PAGER;
+       }
+
+       if (argc <= 1)
+               return REQ_NONE;
+
+       subcommand = argv[1];
+       if (!strcmp(subcommand, "status")) {
+               if (argc > 2)
+                       warn("ignoring arguments after `%s'", subcommand);
+               return REQ_VIEW_STATUS;
+
+       } else if (!strcmp(subcommand, "blame")) {
+               if (argc <= 2 || argc > 4)
+                       die("invalid number of options to blame\n\n%s", usage);
+
+               i = 2;
+               if (argc == 4) {
+                       string_ncopy(opt_ref, argv[i], strlen(argv[i]));
+                       i++;
+               }
+
+               string_ncopy(opt_file, argv[i], strlen(argv[i]));
+               return REQ_VIEW_BLAME;
+
+       } else if (!strcmp(subcommand, "show")) {
+               request = REQ_VIEW_DIFF;
+
+       } else {
+               subcommand = NULL;
+       }
+
+       if (subcommand) {
+               custom_argv[1] = subcommand;
+               j = 2;
+       }
+
+       for (i = 1 + !!subcommand; i < argc; i++) {
+               const char *opt = argv[i];
+
+               if (seen_dashdash || !strcmp(opt, "--")) {
+                       seen_dashdash = TRUE;
+
+               } else if (!strcmp(opt, "-v") || !strcmp(opt, "--version")) {
+                       printf("tig version %s\n", TIG_VERSION);
+                       quit(0);
+
+               } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
+                       printf("%s\n", usage);
+                       quit(0);
+               }
+
+               custom_argv[j++] = opt;
+               if (j >= ARRAY_SIZE(custom_argv))
+                       die("command too long");
+       }
+
+       if (!prepare_update(VIEW(request), custom_argv, NULL, FORMAT_NONE))
+               die("Failed to format arguments");
+
+       return request;
+}
+
 int
 main(int argc, const char *argv[])
 {
+       enum request request = parse_options(argc, argv);
        struct view *view;
-       enum request request;
        size_t i;
 
        signal(SIGINT, quit);
+       signal(SIGPIPE, SIG_IGN);
 
        if (setlocale(LC_ALL, "")) {
                char *codeset = nl_langinfo(CODESET);
@@ -6081,10 +7677,6 @@ main(int argc, const char *argv[])
        if (load_git_config() == ERR)
                die("Failed to load repo config.");
 
-       request = parse_options(argc, argv);
-       if (request == REQ_NONE)
-               return 0;
-
        /* Require a git repository unless when running in pager mode. */
        if (!opt_git_dir[0] && request != REQ_VIEW_PAGER)
                die("Not a git repository");
@@ -6102,28 +7694,18 @@ main(int argc, const char *argv[])
                die("Failed to load refs.");
 
        foreach_view (view, i)
-               view->cmd_env = getenv(view->cmd_env);
+               argv_from_env(view->ops->argv, view->cmd_env);
 
        init_display();
 
+       if (request != REQ_NONE)
+               open_view(NULL, request, OPEN_PREPARED);
+       request = request == REQ_NONE ? REQ_VIEW_MAIN : REQ_NONE;
+
        while (view_driver(display[current_view], request)) {
-               int key;
-               int i;
+               int key = get_input(0);
 
-               foreach_view (view, i)
-                       update_view(view);
                view = display[current_view];
-
-               /* Refresh, accept single keystroke of input */
-               key = wgetch(status_win);
-
-               /* wgetch() with nodelay() enabled returns ERR when there's no
-                * input. */
-               if (key == ERR) {
-                       request = REQ_NONE;
-                       continue;
-               }
-
                request = get_keybinding(view->keymap, key);
 
                /* Some low-level request handling. This keeps access to
@@ -6133,15 +7715,33 @@ main(int argc, const char *argv[])
                {
                        char *cmd = read_prompt(":");
 
-                       if (cmd && string_format(opt_cmd, "git %s", cmd)) {
-                               if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
-                                       request = REQ_VIEW_DIFF;
+                       if (cmd && isdigit(*cmd)) {
+                               int lineno = view->lineno + 1;
+
+                               if (parse_int(&lineno, cmd, 1, view->lines + 1) == OK) {
+                                       select_view_line(view, lineno - 1);
+                                       report("");
                                } else {
-                                       request = REQ_VIEW_PAGER;
+                                       report("Unable to parse '%s' as a line number", cmd);
                                }
 
-                               /* Always reload^Wrerun commands from the prompt. */
-                               open_view(view, request, OPEN_RELOAD);
+                       } else if (cmd) {
+                               struct view *next = VIEW(REQ_VIEW_PAGER);
+                               const char *argv[SIZEOF_ARG] = { "git" };
+                               int argc = 1;
+
+                               /* When running random commands, initially show the
+                                * command in the title. However, it maybe later be
+                                * overwritten if a commit line is selected. */
+                               string_ncopy(next->ref, cmd, strlen(cmd));
+
+                               if (!argv_from_string(argv, &argc, cmd)) {
+                                       report("Too many arguments");
+                               } else if (!prepare_update(next, argv, NULL, FORMAT_DASH)) {
+                                       report("Failed to format command");
+                               } else {
+                                       open_view(view, REQ_VIEW_PAGER, OPEN_PREPARED);
+                               }
                        }
 
                        request = REQ_NONE;
@@ -6155,23 +7755,14 @@ main(int argc, const char *argv[])
 
                        if (search)
                                string_ncopy(opt_search, search, strlen(search));
+                       else if (*opt_search)
+                               request = request == REQ_SEARCH ?
+                                       REQ_FIND_NEXT :
+                                       REQ_FIND_PREV;
                        else
                                request = REQ_NONE;
                        break;
                }
-               case REQ_SCREEN_RESIZE:
-               {
-                       int height, width;
-
-                       getmaxyx(stdscr, height, width);
-
-                       /* Resize the status view and let the view driver take
-                        * care of resizing the displayed views. */
-                       wresize(status_win, 1, width);
-                       mvwin(status_win, height - 1, 0);
-                       wrefresh(status_win);
-                       break;
-               }
                default:
                        break;
                }