Code

Rename & move read_properties and git_properties
[tig.git] / tig.c
diff --git a/tig.c b/tig.c
index f8132fd0f8aeaaf096aea74a0e2cd041edbfe2f7..dc1d2251464c031c7744d22bd9ebac928975c0a4 100644 (file)
--- a/tig.c
+++ b/tig.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2006-2007 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 <time.h>
+#include <fcntl.h>
 
 #include <regex.h>
 
 /* ncurses(3): Must be defined to have extended wide-character functions. */
 #define _XOPEN_SOURCE_EXTENDED
 
-#include <curses.h>
+#ifdef HAVE_NCURSESW_NCURSES_H
+#include <ncursesw/ncurses.h>
+#else
+#ifdef HAVE_NCURSES_NCURSES_H
+#include <ncurses/ncurses.h>
+#else
+#include <ncurses.h>
+#endif
+#endif
 
 #if __GNUC__ >= 3
 #define __NORETURN __attribute__((__noreturn__))
@@ -56,9 +67,9 @@
 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, size_t max_width, int *trimmed, bool reserve);
+static size_t utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool reserve);
+static int load_refs(void);
 
 #define ABS(x)         ((x) >= 0  ? (x) : -(x))
 #define MIN(x, y)      ((x) < (y) ? (x) :  (y))
@@ -68,7 +79,8 @@ static size_t utf8_length(const char *string, size_t max_width, int *trimmed, bo
 
 #define SIZEOF_STR     1024    /* Default string size. */
 #define SIZEOF_REF     256     /* Size of symbolic or SHA1 ID. */
-#define SIZEOF_REV     41      /* Holds a SHA-1 and an ending NUL */
+#define SIZEOF_REV     41      /* Holds a SHA-1 and an ending NUL. */
+#define SIZEOF_ARG     32      /* Default argument array size. */
 
 /* Revision graph */
 
@@ -77,7 +89,6 @@ static size_t utf8_length(const char *string, size_t max_width, int *trimmed, bo
 #define REVGRAPH_BRANCH        '+'
 #define REVGRAPH_COMMIT        '*'
 #define REVGRAPH_BOUND '^'
-#define REVGRAPH_LINE  '|'
 
 #define SIZEOF_REVGRAPH        19      /* Size of revision ancestry graphics. */
 
@@ -94,42 +105,21 @@ static size_t utf8_length(const char *string, size_t max_width, int *trimmed, bo
 #define DATE_COLS      STRING_SIZE("2006-04-29 14:21 ")
 
 #define AUTHOR_COLS    20
+#define ID_COLS                8
 
 /* The default interval between line numbers. */
-#define NUMBER_INTERVAL        1
+#define NUMBER_INTERVAL        5
 
-#define TABSIZE                8
+#define TAB_SIZE       8
 
 #define        SCALE_SPLIT_VIEW(height)        ((height) * 2 / 3)
 
+#define NULL_ID                "0000000000000000000000000000000000000000"
+
 #ifndef GIT_CONFIG
-#define GIT_CONFIG "git config"
+#define GIT_CONFIG "config"
 #endif
 
-#define TIG_LS_REMOTE \
-       "git ls-remote $(git rev-parse --git-dir) 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 TIG_MAIN_CMD \
-       "git log --no-color --topo-order --parents --boundary --pretty=raw %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  ""
-
 /* Some ascii-shorthands fitted into the ncurses namespace. */
 #define KEY_TAB                '\t'
 #define KEY_RETURN     '\r'
@@ -139,13 +129,23 @@ static size_t utf8_length(const char *string, size_t max_width, int *trimmed, bo
 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? */
 };
 
-static struct ref **get_refs(char *id);
+static struct ref **get_refs(const char *id);
+
+enum format_flags {
+       FORMAT_ALL,             /* Perform replacement in all arguments. */
+       FORMAT_DASH,            /* Perform replacement up until "--". */
+       FORMAT_NONE             /* No replacement should be performed. */
+};
+
+static bool format_argv(const char *dst[], const char *src[], enum format_flags flags);
 
 struct int_map {
        const char *name;
@@ -170,6 +170,17 @@ set_from_int_map(struct int_map *map, size_t map_size,
        return ERR;
 }
 
+enum input_status {
+       INPUT_OK,
+       INPUT_SKIP,
+       INPUT_STOP,
+       INPUT_CANCEL
+};
+
+typedef enum input_status (*input_handler)(void *data, char *buf, int c);
+
+static char *prompt_input(const char *prompt, input_handler handler, void *data);
+static bool prompt_yesno(const char *prompt);
 
 /*
  * String helpers
@@ -258,47 +269,435 @@ string_enum_compare(const char *str1, const char *str2, int len)
        return 0;
 }
 
-/* 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'
+#define prefixcmp(str1, str2) \
+       strncmp(str1, str2, STRING_SIZE(str2))
+
+static inline int
+suffixcmp(const char *str, int slen, const char *suffix)
+{
+       size_t len = slen >= 0 ? slen : strlen(str);
+       size_t suffixlen = strlen(suffix);
+
+       return suffixlen < len ? strcmp(str + len - suffixlen, suffix) : -1;
+}
+
+
+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.
  */
 
-static size_t
-sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
+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 *name)
+{
+       init_io(io, NULL, IO_FD);
+       io->pipe = *name ? open(name, O_RDONLY) : STDIN_FILENO;
+       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)
+{
+       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);
+       }
+
+       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, enum format_flags flags)
+{
+       return init_io_rd(io, argv, NULL, 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 bool
+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);
+}
+
+static char *
+io_get(struct io *io, int c, bool can_read)
+{
+       char *eol;
+       ssize_t readsize;
+
+       if (!io->buf) {
+               io->buf = io->bufpos = malloc(BUFSIZ);
+               if (!io->buf)
+                       return NULL;
+               io->bufalloc = BUFSIZ;
+               io->bufsize = 0;
+       }
+
+       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);
+
+               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
+run_io_buf(const char **argv, char buf[], size_t bufsize)
+{
+       struct io io = {};
+       bool error;
+
+       if (!run_io_rd(&io, argv, FORMAT_NONE))
+               return FALSE;
+
+       io.buf = io.bufpos = buf;
+       io.bufalloc = bufsize;
+       error = !io_get(&io, '\n', TRUE) && io_error(&io);
+       io.buf = NULL;
+
+       return done_io(&io) || error;
+}
+
+static int
+io_load(struct io *io, const char *separators,
+       int (*read_property)(char *, size_t, char *, size_t))
 {
-       char c;
+       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);
 
-#define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
+               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;
 }
 
 
@@ -314,6 +713,7 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(VIEW_LOG,          "Show log view"), \
        REQ_(VIEW_TREE,         "Show tree view"), \
        REQ_(VIEW_BLOB,         "Show blob view"), \
+       REQ_(VIEW_BLAME,        "Show blame view"), \
        REQ_(VIEW_HELP,         "Show help page"), \
        REQ_(VIEW_PAGER,        "Show pager view"), \
        REQ_(VIEW_STATUS,       "Show status view"), \
@@ -323,11 +723,19 @@ 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"), \
        REQ_(VIEW_CLOSE,        "Close the current view"), \
        REQ_(QUIT,              "Close all views and quit"), \
        \
+       REQ_GROUP("View specific requests") \
+       REQ_(STATUS_UPDATE,     "Update file status"), \
+       REQ_(STATUS_REVERT,     "Revert file changes"), \
+       REQ_(STATUS_MERGE,      "Merge file using external tool"), \
+       REQ_(STAGE_NEXT,        "Find next chunk to stage"), \
+       \
        REQ_GROUP("Cursor navigation") \
        REQ_(MOVE_UP,           "Move cursor one line up"), \
        REQ_(MOVE_DOWN,         "Move cursor one line down"), \
@@ -348,20 +756,18 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(FIND_NEXT,         "Find next search match"), \
        REQ_(FIND_PREV,         "Find previous search match"), \
        \
-       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_GROUP("Option manipulation") \
        REQ_(TOGGLE_LINENO,     "Toggle line numbers"), \
        REQ_(TOGGLE_DATE,       "Toggle date display"), \
        REQ_(TOGGLE_AUTHOR,     "Toggle author display"), \
        REQ_(TOGGLE_REV_GRAPH,  "Toggle revision graph visualization"), \
        REQ_(TOGGLE_REFS,       "Toggle reference display (tags/branches)"), \
-       REQ_(STATUS_UPDATE,     "Update file status"), \
-       REQ_(STATUS_MERGE,      "Merge file using external tool"), \
-       REQ_(TREE_PARENT,       "Switch to parent directory in tree view"), \
+       \
+       REQ_GROUP("Misc") \
+       REQ_(PROMPT,            "Bring up the prompt"), \
+       REQ_(SCREEN_REDRAW,     "Redraw the screen"), \
+       REQ_(SHOW_VERSION,      "Show version information"), \
+       REQ_(STOP_LOADING,      "Stop all loading views"), \
        REQ_(EDIT,              "Open in editor"), \
        REQ_(NONE,              "Do nothing")
 
@@ -381,9 +787,9 @@ enum request {
 
 struct request_info {
        enum request request;
-       char *name;
+       const char *name;
        int namelen;
-       char *help;
+       const char *help;
 };
 
 static struct request_info req_info[] = {
@@ -418,187 +824,126 @@ static const char usage[] =
 "\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\n";
+"  -h, --help      Show help message and exit";
 
 /* Option and state variables. */
 static bool opt_date                   = TRUE;
 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                        = TABSIZE;
-static enum request opt_request                = REQ_VIEW_MAIN;
-static char opt_cmd[SIZEOF_STR]                = "";
+static int opt_tab_size                        = TAB_SIZE;
+static int opt_author_cols             = AUTHOR_COLS-1;
 static char opt_path[SIZEOF_STR]       = "";
-static FILE *opt_pipe                  = NULL;
+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 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;
 
-enum option_type {
-       OPT_NONE,
-       OPT_INT,
-};
+#define is_initial_commit()    (!*opt_head_rev)
+#define is_head_commit(rev)    (!strcmp((rev), "HEAD") || !strcmp(opt_head_rev, (rev)))
 
-static bool
-check_option(char *opt, char short_name, char *name, enum option_type type, ...)
+static enum request
+parse_options(int argc, const char *argv[], const char ***run_argv)
 {
-       va_list args;
-       char *value = "";
-       int *number;
+       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. */
+       static const char *custom_argv[SIZEOF_ARG] = {
+               "git", "log", "--no-color", "--pretty=raw", "--parents",
+                       "--topo-order", NULL
+       };
+       int i, j = 6;
 
-       if (opt[0] != '-')
-               return FALSE;
+       if (!isatty(STDIN_FILENO))
+               return REQ_VIEW_PAGER;
 
-       if (opt[1] == '-') {
-               int namelen = strlen(name);
+       if (argc <= 1)
+               return REQ_VIEW_MAIN;
 
-               opt += 2;
+       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;
 
-               if (strncmp(opt, name, namelen))
-                       return FALSE;
+       } else if (!strcmp(subcommand, "blame")) {
+               if (argc <= 2 || argc > 4)
+                       die("invalid number of options to blame\n\n%s", usage);
 
-               if (opt[namelen] == '=')
-                       value = opt + namelen + 1;
+               i = 2;
+               if (argc == 4) {
+                       string_ncopy(opt_ref, argv[i], strlen(argv[i]));
+                       i++;
+               }
 
-       } else {
-               if (!short_name || opt[1] != short_name)
-                       return FALSE;
-               value = opt + 2;
-       }
-
-       va_start(args, type);
-       if (type == OPT_INT) {
-               number = va_arg(args, int *);
-               if (isdigit(*value))
-                       *number = atoi(value);
-       }
-       va_end(args);
-
-       return TRUE;
-}
-
-/* Returns the index of log or diff command or -1 to exit. */
-static bool
-parse_options(int argc, char *argv[])
-{
-       char *altargv[1024];
-       int altargc = 0;
-       char *subcommand;
-       int i;
-
-       if (argc <= 1)
-               return TRUE;
-
-       subcommand = argv[1];
-       if (!strcmp(subcommand, "status")) {
-               opt_request = REQ_VIEW_STATUS;
-               if (argc > 2)
-                       warn("ignoring arguments after `%s'", subcommand);
-               return TRUE;
+               string_ncopy(opt_file, argv[i], strlen(argv[i]));
+               return REQ_VIEW_BLAME;
 
        } else if (!strcmp(subcommand, "show")) {
-               opt_request = REQ_VIEW_DIFF;
+               request = REQ_VIEW_DIFF;
 
        } else if (!strcmp(subcommand, "log") || !strcmp(subcommand, "diff")) {
-               opt_request = subcommand[0] == 'l'
-                           ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
+               request = subcommand[0] == 'l' ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
                warn("`tig %s' has been deprecated", subcommand);
 
        } else {
                subcommand = NULL;
        }
 
-       for (i = 1 + !!subcommand; i < argc; i++) {
-               char *opt = argv[i];
-
-               if (opt[0] && opt[0] != '-')
-                       break;
-
-               if (!strcmp(opt, "--")) {
-                       i++;
-                       break;
-               }
-
-               if (check_option(opt, 'v', "version", OPT_NONE)) {
-                       printf("tig version %s\n", TIG_VERSION);
-                       return FALSE;
-               }
-
-               if (check_option(opt, 'h', "help", OPT_NONE)) {
-                       printf(usage);
-                       return FALSE;
-               }
-
-               if (!strcmp(opt, "-S")) {
-                       warn("`%s' has been deprecated; use `tig status' instead", opt);
-                       opt_request = REQ_VIEW_STATUS;
-                       continue;
-               }
-
-               if (!strcmp(opt, "-l")) {
-                       opt_request = REQ_VIEW_LOG;
-               } else if (!strcmp(opt, "-d")) {
-                       opt_request = REQ_VIEW_DIFF;
-               } else if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
-                       opt_line_number = TRUE;
-               } else if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
-                       opt_tab_size = MIN(opt_tab_size, TABSIZE);
-               } else {
-                       if (altargc >= ARRAY_SIZE(altargv))
-                               die("maximum number of arguments exceeded");
-                       altargv[altargc++] = opt;
-                       continue;
-               }
-
-               warn("`%s' has been deprecated", opt);
+       if (subcommand) {
+               custom_argv[1] = subcommand;
+               j = 2;
        }
 
-       if (!isatty(STDIN_FILENO)) {
-               opt_request = REQ_VIEW_PAGER;
-               opt_pipe = stdin;
-
-       } else if (i < argc || altargc > 0) {
-               int alti = 0;
-               size_t buf_size;
+       for (i = 1 + !!subcommand; i < argc; i++) {
+               const char *opt = argv[i];
 
-               if (opt_request == REQ_VIEW_MAIN)
-                       /* XXX: This is vulnerable to the user overriding
-                        * options required for the main view parser. */
-                       string_copy(opt_cmd, "git log --no-color --pretty=raw --boundary --parents");
-               else
-                       string_format(opt_cmd, "git %s", subcommand);
-               buf_size = strlen(opt_cmd);
+               if (seen_dashdash || !strcmp(opt, "--")) {
+                       seen_dashdash = TRUE;
 
-               while (buf_size < sizeof(opt_cmd) && alti < altargc) {
-                       opt_cmd[buf_size++] = ' ';
-                       buf_size = sq_quote(opt_cmd, buf_size, altargv[alti++]);
-               }
+               } else if (!strcmp(opt, "-v") || !strcmp(opt, "--version")) {
+                       printf("tig version %s\n", TIG_VERSION);
+                       return REQ_NONE;
 
-               while (buf_size < sizeof(opt_cmd) && i < argc) {
-                       opt_cmd[buf_size++] = ' ';
-                       buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
+               } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
+                       printf("%s\n", usage);
+                       return REQ_NONE;
                }
 
-               if (buf_size >= sizeof(opt_cmd))
+               custom_argv[j++] = opt;
+               if (j >= ARRAY_SIZE(custom_argv))
                        die("command too long");
-
-               opt_cmd[buf_size] = 0;
        }
 
-       return TRUE;
+       custom_argv[j] = NULL;
+       *run_argv = custom_argv;
+
+       return request;
 }
 
 
@@ -638,29 +983,37 @@ LINE(ACKED,          "    Acked-by",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
 LINE(DEFAULT,     "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
 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(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_DATE,    "",                 COLOR_BLUE,     COLOR_DEFAULT,  0), \
 LINE(MAIN_AUTHOR,  "",                 COLOR_GREEN,    COLOR_DEFAULT,  0), \
 LINE(MAIN_COMMIT,  "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
-LINE(MAIN_DELIM,   "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(MAIN_TAG,     "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
-LINE(MAIN_LOCAL_TAG,"",                        COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
-LINE(MAIN_REMOTE,  "",                 COLOR_YELLOW,   COLOR_DEFAULT,  A_BOLD), \
-LINE(MAIN_REF,     "",                 COLOR_CYAN,     COLOR_DEFAULT,  A_BOLD), \
+LINE(MAIN_LOCAL_TAG,"",                        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
+LINE(MAIN_REMOTE,  "",                 COLOR_YELLOW,   COLOR_DEFAULT,  0), \
+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_PARENT,  "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  A_BOLD), \
+LINE(TREE_MODE,    "",                 COLOR_CYAN,     COLOR_DEFAULT,  0), \
+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), \
 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(STAT_UNTRACKED,"",                        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
+LINE(BLAME_ID,     "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0)
 
 enum line_type {
 #define LINE(type, line, fg, bg, attr) \
        LINE_##type
-       LINE_INFO
+       LINE_INFO,
+       LINE_NONE
 #undef LINE
 };
 
@@ -680,7 +1033,7 @@ static struct line_info line_info[] = {
 };
 
 static enum line_type
-get_line_type(char *line)
+get_line_type(const char *line)
 {
        int linelen = strlen(line);
        enum line_type type;
@@ -702,8 +1055,9 @@ get_line_attr(enum line_type type)
 }
 
 static struct line_info *
-get_line_info(char *name, int namelen)
+get_line_info(const char *name)
 {
+       size_t namelen = strlen(name);
        enum line_type type;
 
        for (type = 0; type < ARRAY_SIZE(line_info); type++)
@@ -742,6 +1096,8 @@ struct line {
 
        /* State flags */
        unsigned int selected:1;
+       unsigned int dirty:1;
+       unsigned int cleareol:1;
 
        void *data;             /* User data */
 };
@@ -754,7 +1110,6 @@ struct line {
 struct keybinding {
        int alias;
        enum request request;
-       struct keybinding *next;
 };
 
 static struct keybinding default_keybindings[] = {
@@ -764,6 +1119,7 @@ static struct keybinding default_keybindings[] = {
        { 'l',          REQ_VIEW_LOG },
        { 't',          REQ_VIEW_TREE },
        { 'f',          REQ_VIEW_BLOB },
+       { 'B',          REQ_VIEW_BLAME },
        { 'p',          REQ_VIEW_PAGER },
        { 'h',          REQ_VIEW_HELP },
        { 'S',          REQ_VIEW_STATUS },
@@ -776,6 +1132,8 @@ static struct keybinding default_keybindings[] = {
        { KEY_UP,       REQ_PREVIOUS },
        { KEY_DOWN,     REQ_NEXT },
        { 'R',          REQ_REFRESH },
+       { KEY_F(5),     REQ_REFRESH },
+       { 'O',          REQ_MAXIMIZE },
 
        /* Cursor navigation */
        { 'k',          REQ_MOVE_UP },
@@ -812,12 +1170,11 @@ static struct keybinding default_keybindings[] = {
        { 'F',          REQ_TOGGLE_REFS },
        { ':',          REQ_PROMPT },
        { 'u',          REQ_STATUS_UPDATE },
+       { '!',          REQ_STATUS_REVERT },
        { 'M',          REQ_STATUS_MERGE },
-       { ',',          REQ_TREE_PARENT },
+       { '@',          REQ_STAGE_NEXT },
+       { ',',          REQ_PARENT },
        { 'e',          REQ_EDIT },
-
-       /* Using the ncurses SIGWINCH handler. */
-       { KEY_RESIZE,   REQ_SCREEN_RESIZE },
 };
 
 #define KEYMAP_INFO \
@@ -827,6 +1184,7 @@ static struct keybinding default_keybindings[] = {
        KEYMAP_(LOG), \
        KEYMAP_(TREE), \
        KEYMAP_(BLOB), \
+       KEYMAP_(BLAME), \
        KEYMAP_(PAGER), \
        KEYMAP_(HELP), \
        KEYMAP_(STATUS), \
@@ -847,21 +1205,23 @@ static struct int_map keymap_table[] = {
 #define set_keymap(map, name) \
        set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
 
-static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
+struct keybinding_table {
+       struct keybinding *data;
+       size_t size;
+};
+
+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
@@ -869,16 +1229,15 @@ 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)
@@ -889,7 +1248,7 @@ get_keybinding(enum keymap keymap, int key)
 
 
 struct key {
-       char *name;
+       const char *name;
        int value;
 };
 
@@ -939,11 +1298,11 @@ get_key_value(const char *name)
        return ERR;
 }
 
-static char *
+static const char *
 get_key_name(int key_value)
 {
        static char key_char[] = "'X'";
-       char *seq = NULL;
+       const char *seq = NULL;
        int key;
 
        for (key = 0; key < ARRAY_SIZE(key_table); key++)
@@ -957,10 +1316,10 @@ get_key_name(int key_value)
                seq = key_char;
        }
 
-       return seq ? seq : "'?'";
+       return seq ? seq : "(no key)";
 }
 
-static char *
+static const char *
 get_key(enum request request)
 {
        static char buf[BUFSIZ];
@@ -988,33 +1347,34 @@ 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;
 
 static enum request
-add_run_request(enum keymap keymap, int key, int argc, char **argv)
+add_run_request(enum keymap keymap, int key, int argc, const char **argv)
 {
-       struct run_request *tmp;
-       struct run_request req = { keymap, key };
-       size_t bufpos;
-
-       for (bufpos = 0; argc > 0; argc--, argv++)
-               if (!string_format_from(req.cmd, &bufpos, "%s ", *argv))
-                       return REQ_NONE;
+       struct run_request *req;
 
-       req.cmd[bufpos - 1] = 0;
+       if (argc >= ARRAY_SIZE(req->argv) - 1)
+               return REQ_NONE;
 
-       tmp = realloc(run_request, (run_requests + 1) * sizeof(*run_request));
-       if (!tmp)
+       req = realloc(run_request, (run_requests + 1) * sizeof(*run_request));
+       if (!req)
                return REQ_NONE;
 
-       run_request = tmp;
-       run_request[run_requests++] = req;
+       run_request = req;
+       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 *
@@ -1028,20 +1388,23 @@ get_run_request(enum request request)
 static void
 add_builtin_run_requests(void)
 {
+       const char *cherry_pick[] = { "git", "cherry-pick", "%(commit)", NULL };
+       const char *gc[] = { "git", "gc", NULL };
        struct {
                enum keymap keymap;
                int key;
-               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_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);
        }
@@ -1083,11 +1446,11 @@ static struct int_map attr_map[] = {
 
 static int   config_lineno;
 static bool  config_errors;
-static char *config_msg;
+static const char *config_msg;
 
 /* Wants: object fgcolor bgcolor [attr] */
 static int
-option_color_command(int argc, char *argv[])
+option_color_command(int argc, const char *argv[])
 {
        struct line_info *info;
 
@@ -1096,10 +1459,18 @@ option_color_command(int argc, char *argv[])
                return ERR;
        }
 
-       info = get_line_info(argv[0], strlen(argv[0]));
+       info = get_line_info(argv[0]);
        if (!info) {
-               config_msg = "Unknown color name";
-               return ERR;
+               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 {
+                       config_msg = "Unknown color name";
+                       return ERR;
+               }
        }
 
        if (set_color(&info->fg, argv[1]) == ERR ||
@@ -1122,9 +1493,17 @@ static bool parse_bool(const char *s)
                !strcmp(s, "yes")) ? TRUE : FALSE;
 }
 
+static int
+parse_int(const char *s, int default_value, int min, int max)
+{
+       int value = atoi(s);
+
+       return (value < min || value > max) ? default_value : value;
+}
+
 /* Wants: name = value */
 static int
-option_set_command(int argc, char *argv[])
+option_set_command(int argc, const char *argv[])
 {
        if (argc != 3) {
                config_msg = "Wrong number of arguments given to set command";
@@ -1161,29 +1540,38 @@ option_set_command(int argc, char *argv[])
                return OK;
        }
 
+       if (!strcmp(argv[0], "line-graphics")) {
+               opt_line_graphics = parse_bool(argv[2]);
+               return OK;
+       }
+
        if (!strcmp(argv[0], "line-number-interval")) {
-               opt_num_interval = atoi(argv[2]);
+               opt_num_interval = parse_int(argv[2], opt_num_interval, 1, 1024);
+               return OK;
+       }
+
+       if (!strcmp(argv[0], "author-width")) {
+               opt_author_cols = parse_int(argv[2], opt_author_cols, 0, 1024);
                return OK;
        }
 
        if (!strcmp(argv[0], "tab-size")) {
-               opt_tab_size = atoi(argv[2]);
+               opt_tab_size = parse_int(argv[2], opt_tab_size, 1, 1024);
                return OK;
        }
 
        if (!strcmp(argv[0], "commit-encoding")) {
-               char *arg = argv[2];
-               int delimiter = *arg;
-               int i;
+               const char *arg = argv[2];
+               int arglen = strlen(arg);
 
-               switch (delimiter) {
+               switch (arg[0]) {
                case '"':
                case '\'':
-                       for (arg++, i = 0; arg[i]; i++)
-                               if (arg[i] == delimiter) {
-                                       arg[i] = 0;
-                                       break;
-                               }
+                       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;
@@ -1196,7 +1584,7 @@ option_set_command(int argc, char *argv[])
 
 /* Wants: mode request key */
 static int
-option_bind_command(int argc, char *argv[])
+option_bind_command(int argc, const char *argv[])
 {
        enum request request;
        int keymap;
@@ -1220,16 +1608,25 @@ option_bind_command(int argc, char *argv[])
 
        request = get_request(argv[2]);
        if (request == REQ_NONE) {
-               const char *obsolete[] = { "cherry-pick" };
+               struct {
+                       const char *name;
+                       enum request request;
+               } obsolete[] = {
+                       { "cherry-pick",        REQ_NONE },
+                       { "screen-resize",      REQ_NONE },
+                       { "tree-parent",        REQ_PARENT },
+               };
                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;
-                       }
+                       if (namelen != strlen(obsolete[i].name) ||
+                           string_enum_compare(obsolete[i].name, argv[2], namelen))
+                               continue;
+                       if (obsolete[i].request != REQ_NONE)
+                               add_keybinding(keymap, obsolete[i].request, key);
+                       config_msg = "Obsolete request name";
+                       return ERR;
                }
        }
        if (request == REQ_NONE && *argv[2]++ == '!')
@@ -1245,24 +1642,14 @@ option_bind_command(int argc, char *argv[])
 }
 
 static int
-set_option(char *opt, char *value)
+set_option(const char *opt, char *value)
 {
-       char *argv[16];
-       int valuelen;
+       const char *argv[SIZEOF_ARG];
        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"))
@@ -1309,8 +1696,8 @@ 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;
        }
 
@@ -1321,27 +1708,26 @@ 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)
+       if (!io_open(&io, 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
 load_options(void)
 {
-       char *home = getenv("HOME");
-       char *tigrc_user = getenv("TIGRC_USER");
-       char *tigrc_system = getenv("TIGRC_SYSTEM");
+       const char *home = getenv("HOME");
+       const char *tigrc_user = getenv("TIGRC_USER");
+       const char *tigrc_system = getenv("TIGRC_SYSTEM");
        char buf[SIZEOF_STR];
 
        add_builtin_run_requests();
@@ -1375,9 +1761,6 @@ 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++)
 
@@ -1390,15 +1773,14 @@ 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} */
 
        struct view_ops *ops;   /* View operations */
 
        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. */
 
@@ -1409,6 +1791,9 @@ struct view {
        /* Navigation */
        unsigned long offset;   /* Offset of the window top */
        unsigned long lineno;   /* Current line number */
+       unsigned long p_offset; /* Previous offset of the window top */
+       unsigned long p_lineno; /* Previous current line number */
+       bool p_restore;         /* Should the previous position be restored. */
 
        /* Searching */
        char grep[SIZEOF_STR];  /* Search string */
@@ -1422,23 +1807,32 @@ struct view {
        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. */
        bool (*read)(struct view *view, char *data);
        /* Draw one line; @lineno must be < view->height. */
-       bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
+       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. */
@@ -1447,34 +1841,39 @@ struct view_ops {
        void (*select)(struct view *view, struct line *line);
 };
 
-static struct view_ops pager_ops;
-static struct view_ops main_ops;
-static struct view_ops tree_ops;
+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 status_ops;
+static struct view_ops log_ops;
+static struct view_ops main_ops;
+static struct view_ops pager_ops;
 static struct view_ops stage_ops;
+static struct view_ops status_ops;
+static struct view_ops tree_ops;
 
-#define VIEW_STR(name, cmd, env, ref, ops, map) \
-       { name, cmd, #env, ref, ops, map}
+#define VIEW_STR(name, env, ref, ops, map, git) \
+       { name, #env, ref, ops, map, git }
 
-#define VIEW_(id, name, ops, ref) \
-       VIEW_STR(name, TIG_##id##_CMD,  TIG_##id##_CMD, ref, ops, KEYMAP_##id)
+#define VIEW_(id, name, ops, git, ref) \
+       VIEW_STR(name, TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
 
 
 static struct view views[] = {
-       VIEW_(MAIN,   "main",   &main_ops,   ref_head),
-       VIEW_(DIFF,   "diff",   &pager_ops,  ref_commit),
-       VIEW_(LOG,    "log",    &pager_ops,  ref_head),
-       VIEW_(TREE,   "tree",   &tree_ops,   ref_commit),
-       VIEW_(BLOB,   "blob",   &blob_ops,   ref_blob),
-       VIEW_(HELP,   "help",   &help_ops,   ""),
-       VIEW_(PAGER,  "pager",  &pager_ops,  "stdin"),
-       VIEW_(STATUS, "status", &status_ops, ""),
-       VIEW_(STAGE,  "stage",  &stage_ops,  ""),
+       VIEW_(MAIN,   "main",   &main_ops,   TRUE,  ref_head),
+       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_(HELP,   "help",   &help_ops,   FALSE, ""),
+       VIEW_(PAGER,  "pager",  &pager_ops,  FALSE, "stdin"),
+       VIEW_(STATUS, "status", &status_ops, TRUE,  ""),
+       VIEW_(STAGE,  "stage",  &stage_ops,  TRUE,  ""),
 };
 
-#define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
+#define VIEW(req)      (&views[(req) - REQ_OFFSET - 1])
+#define VIEW_REQ(view) ((view) - views + REQ_OFFSET + 1)
 
 #define foreach_view(view, i) \
        for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
@@ -1482,38 +1881,201 @@ static struct view views[] = {
 #define view_is_displayed(view) \
        (view == display[0] || view == display[1])
 
+
+enum line_graphic {
+       LINE_GRAPHIC_VLINE
+};
+
+static int line_graphics[] = {
+       /* LINE_GRAPHIC_VLINE: */ '|'
+};
+
+static inline void
+set_view_attr(struct view *view, enum line_type type)
+{
+       if (!view->curline->selected && view->curtype != type) {
+               wattrset(view->win, get_line_attr(type));
+               wchgat(view->win, -1, 0, type, NULL);
+               view->curtype = type;
+       }
+}
+
 static int
-draw_text(struct view *view, const char *string, int max_len,
-         bool use_tilde, int tilde_attr)
+draw_chars(struct view *view, enum line_type type, const char *string,
+          int max_len, bool use_tilde)
 {
        int len = 0;
+       int col = 0;
        int trimmed = FALSE;
 
        if (max_len <= 0)
                return 0;
 
        if (opt_utf8) {
-               len = utf8_length(string, max_len, &trimmed, use_tilde);
+               len = utf8_length(string, &col, max_len, &trimmed, use_tilde);
        } else {
-               len = strlen(string);
+               col = len = strlen(string);
                if (len > max_len) {
                        if (use_tilde) {
                                max_len -= 1;
                        }
-                       len = max_len;
+                       col = len = max_len;
                        trimmed = TRUE;
                }
        }
 
+       set_view_attr(view, type);
        waddnstr(view->win, string, len);
        if (trimmed && use_tilde) {
-               if (tilde_attr != -1)
-                       wattrset(view->win, tilde_attr);
+               set_view_attr(view, LINE_DELIMITER);
                waddch(view->win, '~');
-               len++;
+               col++;
+       }
+
+       return col;
+}
+
+static int
+draw_space(struct view *view, enum line_type type, int max, int spaces)
+{
+       static char space[] = "                    ";
+       int col = 0;
+
+       spaces = MIN(max, spaces);
+
+       while (spaces > 0) {
+               int len = MIN(spaces, sizeof(space) - 1);
+
+               col += draw_chars(view, type, space, spaces, 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;
+}
+
+static bool
+draw_graphic(struct view *view, enum line_type type, chtype graphic[], size_t size)
+{
+       int max = view->width - view->col;
+       int i;
+
+       if (max < size)
+               size = max;
+
+       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++)
+               waddch(view->win, graphic[i]);
+
+       view->col += size;
+       if (size < max) {
+               waddch(view->win, ' ');
+               view->col++;
+       }
+
+       return view->width - view->col <= 0;
+}
+
+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 col;
+
+       if (text)
+               col = draw_chars(view, type, text, max - 1, trim);
+       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;
+}
+
+static bool
+draw_date(struct view *view, struct tm *time)
+{
+       char buf[DATE_COLS];
+       char *date;
+       int timelen = 0;
+
+       if (time)
+               timelen = strftime(buf, sizeof(buf), DATE_FORMAT, time);
+       date = timelen ? buf : NULL;
+
+       return draw_field(view, LINE_DATE, 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 len;
+       return draw_field(view, LINE_MAIN_AUTHOR, author, opt_author_cols, trim);
 }
 
 static bool
@@ -1521,7 +2083,6 @@ 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));
 
@@ -1530,20 +2091,43 @@ 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) {
-               line->selected = FALSE;
-               wmove(view->win, lineno, 0);
-               wclrtoeol(view->win);
        }
 
-       scrollok(view->win, FALSE);
-       draw_ok = view->ops->draw(view, line, lineno, selected);
-       scrollok(view->win, TRUE);
+       return view->ops->draw(view, line, lineno);
+}
+
+static void
+redraw_view_dirty(struct view *view)
+{
+       bool dirty = FALSE;
+       int lineno;
+
+       for (lineno = 0; lineno < view->height; lineno++) {
+               if (view->offset + lineno >= view->lines)
+                       break;
+               if (!view->line[view->offset + lineno].dirty)
+                       continue;
+               dirty = TRUE;
+               if (!draw_view_line(view, lineno))
+                       break;
+       }
 
-       return draw_ok;
+       if (!dirty)
+               return;
+       wnoutrefresh(view->win);
 }
 
 static void
@@ -1556,17 +2140,13 @@ 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);
 }
 
@@ -1580,25 +2160,26 @@ 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);
@@ -1612,7 +2193,7 @@ 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])
@@ -1622,12 +2203,7 @@ update_view_title(struct view *view)
 
        mvwaddnstr(view->title, 0, 0, buf, bufpos);
        wclrtoeol(view->title);
-       wmove(view->title, 0, view->width - 1);
-
-       if (input_mode)
-               wnoutrefresh(view->title);
-       else
-               wrefresh(view->title);
+       wnoutrefresh(view->title);
 }
 
 static void
@@ -1665,7 +2241,7 @@ 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)
@@ -1682,28 +2258,25 @@ 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_view_option(bool *option, const char *help)
 {
-       /* 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);
-       }
+       *option = !*option;
+       redraw_display(FALSE);
+       report("%sabling %s", *option ? "En" : "Dis", help);
 }
 
 /*
@@ -1741,19 +2314,19 @@ 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("");
 }
 
@@ -1886,8 +2459,7 @@ 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("");
 }
 
@@ -1898,32 +2470,27 @@ 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)
+static void
+select_view_line(struct view *view, unsigned long lineno)
 {
-       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);
+               if (view_is_displayed(view))
+                       redraw_view(view);
 
        } else {
                unsigned long old_lineno = view->lineno - view->offset;
 
                view->lineno = lineno;
-               draw_view_line(view, old_lineno);
-
-               draw_view_line(view, view->lineno - view->offset);
-               redrawwin(view->win);
-               wrefresh(view->win);
+               if (view_is_displayed(view)) {
+                       draw_view_line(view, old_lineno);
+                       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
@@ -1961,10 +2528,11 @@ 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);
@@ -2003,91 +2571,202 @@ search_view(struct view *view, enum request request)
  */
 
 static void
-end_update(struct view *view)
-{
-       if (!view->pipe)
-               return;
-       set_nonblocking_input(FALSE);
-       if (view->pipe == stdin)
-               fclose(view->pipe);
-       else
-               pclose(view->pipe);
-       view->pipe = NULL;
-}
-
-static bool
-begin_update(struct view *view)
+reset_view(struct view *view)
 {
-       if (view->pipe)
-               end_update(view);
-
-       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];
+       int i;
 
-               if (strcmp(view->vid, view->id))
-                       opt_path[0] = path[0] = 0;
-               else if (sq_quote(path, 0, opt_path) >= sizeof(path))
-                       return FALSE;
+       for (i = 0; i < view->lines; i++)
+               free(view->line[i].data);
+       free(view->line);
 
-               if (!string_format(view->cmd, format, view->id, path))
-                       return FALSE;
+       view->p_offset = view->offset;
+       view->p_lineno = view->lineno;
 
-       } else {
-               const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
-               const char *id = view->id;
+       view->line = NULL;
+       view->offset = 0;
+       view->lines  = 0;
+       view->lineno = 0;
+       view->line_alloc = 0;
+       view->vid[0] = 0;
+       view->update_secs = 0;
+}
 
-               if (!string_format(view->cmd, format, id, id, id, id, id))
-                       return FALSE;
+static void
+free_argv(const char *argv[])
+{
+       int argc;
 
-               /* Put the current ref_* value to the view title ref
-                * member. This is needed by the blob view. Most other
-                * views sets it automatically after loading because the
-                * first line is a commit line. */
-               string_copy_rev(view->ref, view->id);
+       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;
        }
 
-       /* Special case for the pager view. */
-       if (opt_pipe) {
-               view->pipe = opt_pipe;
-               opt_pipe = NULL;
-       } else {
-               view->pipe = popen(view->cmd, "r");
+       dst_argv[argc] = NULL;
+
+       return src_argv[argc] == NULL;
+}
+
+static bool
+restore_view_position(struct view *view)
+{
+       if (!view->p_restore || (view->pipe && view->lines <= view->p_lineno))
+               return FALSE;
+
+       /* 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;
+       }
+
+       if (view->p_lineno >= view->lines) {
+               view->p_lineno = view->lines > 0 ? view->lines - 1 : 0;
+               if (view->p_offset >= view->p_lineno) {
+                       unsigned long half = view->height / 2;
+
+                       if (view->p_lineno > half)
+                               view->p_offset = view->p_lineno - half;
+                       else
+                               view->p_offset = 0;
+               }
        }
 
+       if (view_is_displayed(view) &&
+           view->offset != view->p_offset &&
+           view->lineno != view->p_lineno)
+               werase(view->win);
+
+       view->offset = view->p_offset;
+       view->lineno = view->p_lineno;
+       view->p_restore = FALSE;
+
+       return TRUE;
+}
+
+static void
+end_update(struct view *view, bool force)
+{
        if (!view->pipe)
-               return FALSE;
+               return;
+       while (!view->ops->read(view, NULL))
+               if (!force)
+                       return;
+       set_nonblocking_input(FALSE);
+       if (force)
+               kill_io(view->pipe);
+       done_io(view->pipe);
+       view->pipe = NULL;
+}
 
+static void
+setup_update(struct view *view, const char *vid)
+{
        set_nonblocking_input(TRUE);
+       reset_view(view);
+       string_copy_rev(view->vid, vid);
+       view->pipe = &view->io;
+       view->start_time = time(NULL);
+}
 
-       view->offset = 0;
-       view->lines  = 0;
-       view->lineno = 0;
-       string_copy_rev(view->vid, view->id);
+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 (view->line) {
-               int i;
+static bool
+prepare_update_file(struct view *view, const char *name)
+{
+       if (view->pipe)
+               end_update(view, TRUE);
+       return io_open(&view->io, name);
+}
+
+static bool
+begin_update(struct view *view, bool refresh)
+{
+       if (view->pipe)
+               end_update(view, TRUE);
+
+       if (refresh) {
+               if (!start_io(&view->io))
+                       return FALSE;
+
+       } else {
+               if (view == VIEW(REQ_VIEW_TREE) && strcmp(view->vid, view->id))
+                       opt_path[0] = 0;
 
-               for (i = 0; i < view->lines; i++)
-                       if (view->line[i].data)
-                               free(view->line[i].data);
+               if (!run_io_rd(&view->io, view->ops->argv, FORMAT_ALL))
+                       return FALSE;
 
-               free(view->line);
-               view->line = NULL;
+               /* Put the current ref_* value to the view title ref
+                * member. This is needed by the blob view. Most other
+                * views sets it automatically after loading because the
+                * first line is a commit line. */
+               string_copy_rev(view->ref, view->id);
        }
 
-       view->start_time = time(NULL);
+       setup_update(view, view->id);
 
        return TRUE;
 }
@@ -2119,42 +2798,40 @@ realloc_lines(struct view *view, size_t line_size)
 
        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) {
+                       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);
@@ -2162,104 +2839,96 @@ 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 (!view_is_displayed(view))
-               goto check_pipe;
+       if (io_error(view->pipe)) {
+               report("Failed to read: %s", io_strerror(view->pipe));
+               end_update(view, TRUE);
 
-       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 (io_eof(view->pipe)) {
+               report("");
+               end_update(view, FALSE);
+       }
 
-       } 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--;
+       if (restore_view_position(view))
+               redraw = TRUE;
 
-               /* 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 (!view_is_displayed(view))
+               return TRUE;
 
-               /* Incrementally draw avoids flickering. */
-               redraw_view_from(view, redraw_from);
-       }
+       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);
-
-check_pipe:
-       if (ferror(view->pipe)) {
-               report("Failed to read: %s", strerror(errno));
-               goto end;
-
-       } else if (feof(view->pipe)) {
-               report("");
-               goto end;
-       }
-
        return TRUE;
-
-alloc_error:
-       report("Allocation failure");
-
-end:
-       view->ops->read(view, NULL);
-       end_update(view);
-       return FALSE;
 }
 
 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, 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;
 }
 
 static struct line *
-add_line_text(struct view *view, char *data, enum line_type type)
+add_line_text(struct view *view, const char *text, enum line_type type)
 {
-       if (data)
-               data = strdup(data);
+       char *data = text ? strdup(text) : NULL;
 
        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
@@ -2270,6 +2939,9 @@ enum open_flags {
        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
@@ -2277,7 +2949,8 @@ 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);
+       bool reload = !!(flags & (OPEN_RELOAD | OPEN_REFRESH | OPEN_PREPARED));
+       bool nomaximize = !!(flags & (OPEN_NOMAXIMIZE | OPEN_REFRESH));
        struct view *view = VIEW(request);
        int nviews = displayed_views();
        struct view *base_view = display[0];
@@ -2287,15 +2960,8 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
                return;
        }
 
-       if (view->ops->open) {
-               if (!view->ops->open(view)) {
-                       report("Failed to load %s view", view->name);
-                       return;
-               }
-
-       } else if ((reload || strcmp(view->vid, view->id)) &&
-                  !begin_update(view)) {
-               report("Failed to load %s view", view->name);
+       if (view->git_dir && !opt_git_dir[0]) {
+               report("The %s view is disabled in pager view", view->name);
                return;
        }
 
@@ -2303,7 +2969,7 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
                display[1] = view;
                if (!backgrounded)
                        current_view = 1;
-       } else {
+       } else if (!nomaximize) {
                /* Maximize the current view. */
                memset(display, 0, sizeof(display));
                current_view = 0;
@@ -2316,6 +2982,21 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
            (nviews == 1 && base_view != display[0]))
                resize_display();
 
+       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 | OPEN_PREPARED))) {
+               report("Failed to load %s view", view->name);
+               return;
+       }
+
        if (split && prev->lineno - prev->offset >= prev->height) {
                /* Take the title line into account. */
                int lines = prev->lineno - prev->offset - prev->height + 1;
@@ -2337,9 +3018,10 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
        if (view->pipe && view->lines == 0) {
                /* Clear the old view and let the incremental updating refill
                 * the screen. */
-               wclear(view->win);
+               werase(view->win);
+               view->p_restore = flags & (OPEN_RELOAD | OPEN_REFRESH);
                report("");
-       } else {
+       } else if (view_is_displayed(view)) {
                redraw_view(view);
                report("");
        }
@@ -2351,36 +3033,30 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
 }
 
 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(stdin);
+       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];
-       char *editor;
-       char *prefix = from_root ? opt_cdup : "";
+       const char *editor_argv[] = { "vi", file, NULL };
+       const char *editor;
 
        editor = getenv("GIT_EDITOR");
        if (!editor && *opt_editor)
@@ -2392,60 +3068,24 @@ 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);
 }
 
 /*
@@ -2464,7 +3104,14 @@ view_driver(struct view *view, enum request request)
 
        if (request > REQ_NONE) {
                open_run_request(request);
-               return TRUE;
+               /* FIXME: When all views can refresh always do this. */
+               if (view == VIEW(REQ_VIEW_STATUS) ||
+                   view == VIEW(REQ_VIEW_MAIN) ||
+                   view == VIEW(REQ_VIEW_LOG) ||
+                   view == VIEW(REQ_VIEW_STAGE))
+                       request = REQ_REFRESH;
+               else
+                       return TRUE;
        }
 
        if (view && view->lines) {
@@ -2490,6 +3137,15 @@ view_driver(struct view *view, enum request request)
                scroll_view(view, request);
                break;
 
+       case REQ_VIEW_BLAME:
+               if (!opt_file[0]) {
+                       report("No file chosen, press %s to open tree view",
+                              get_key(REQ_VIEW_TREE));
+                       break;
+               }
+               open_view(view, request, OPEN_DEFAULT);
+               break;
+
        case REQ_VIEW_BLOB:
                if (!ref_blob[0]) {
                        report("No file chosen, press %s to open tree view",
@@ -2500,7 +3156,7 @@ view_driver(struct view *view, enum request request)
                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));
                        break;
@@ -2539,6 +3195,8 @@ view_driver(struct view *view, enum request request)
 
                if ((view == VIEW(REQ_VIEW_DIFF) &&
                     view->parent == VIEW(REQ_VIEW_MAIN)) ||
+                  (view == VIEW(REQ_VIEW_DIFF) &&
+                    view->parent == VIEW(REQ_VIEW_BLAME)) ||
                   (view == VIEW(REQ_VIEW_STAGE) &&
                     view->parent == VIEW(REQ_VIEW_STATUS)) ||
                   (view == VIEW(REQ_VIEW_BLOB) &&
@@ -2579,34 +3237,29 @@ view_driver(struct view *view, enum request request)
                report("Refreshing is not yet supported for the %s view", view->name);
                break;
 
+       case REQ_MAXIMIZE:
+               if (displayed_views() == 2)
+                       open_view(view, VIEW_REQ(view), OPEN_DEFAULT);
+               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_view_option(&opt_date, "date display");
                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();
-               break;
-
-       case REQ_PROMPT:
-               /* Always reload^Wrerun commands from the prompt. */
-               open_view(view, opt_request, OPEN_RELOAD);
+               toggle_view_option(&opt_show_refs, "reference display");
                break;
 
        case REQ_SEARCH:
@@ -2624,7 +3277,7 @@ view_driver(struct view *view, enum request request)
                        view = &views[i];
                        if (view->pipe)
                                report("Stopped loading the %s view", view->name),
-                       end_update(view);
+                       end_update(view, TRUE);
                }
                break;
 
@@ -2632,23 +3285,18 @@ view_driver(struct view *view, enum request request)
                report("tig-%s (built %s)", TIG_VERSION, __DATE__);
                return TRUE;
 
-       case REQ_SCREEN_RESIZE:
-               resize_display();
-               /* Fall-through */
        case REQ_SCREEN_REDRAW:
-               redraw_display();
+               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
@@ -2660,7 +3308,8 @@ view_driver(struct view *view, enum request request)
                        display[current_view] = view->parent;
                        view->parent = view;
                        resize_display();
-                       redraw_display();
+                       redraw_display(FALSE);
+                       report("");
                        break;
                }
                /* Fall-through */
@@ -2668,7 +3317,6 @@ view_driver(struct view *view, enum request request)
                return FALSE;
 
        default:
-               /* An unknown key will show most commonly used commands. */
                report("Unknown key, press 'h' for help");
                return TRUE;
        }
@@ -2678,91 +3326,134 @@ view_driver(struct view *view, enum request request)
 
 
 /*
- * Pager backend
+ * View backend utilities
  */
 
-static bool
-pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
+/* Parse author lines where the name may be empty:
+ *     author  <email@address.tld> 1138474660 +0100
+ */
+static void
+parse_author_line(char *ident, char *author, size_t authorsize, struct tm *tm)
 {
-       char *text = line->data;
-       enum line_type type = line->type;
-       int attr;
-
-       wmove(view->win, lineno, 0);
+       char *nameend = strchr(ident, '<');
+       char *emailend = strchr(ident, '>');
 
-       if (selected) {
-               type = LINE_CURSOR;
-               wchgat(view->win, -1, 0, type, NULL);
+       if (nameend && emailend)
+               *nameend = *emailend = 0;
+       ident = chomp_string(ident);
+       if (!*ident) {
+               if (nameend)
+                       ident = chomp_string(nameend + 1);
+               if (!*ident)
+                       ident = "Unknown";
        }
 
-       attr = get_line_attr(type);
-       wattrset(view->win, attr);
+       string_ncopy_do(author, authorsize, ident, strlen(ident));
 
-       if (opt_line_number || opt_tab_size < TABSIZE) {
-               static char spaces[] = "                    ";
-               int col_offset = 0, col = 0;
+       /* Parse epoch and timezone */
+       if (emailend && emailend[1] == ' ') {
+               char *secs = emailend + 2;
+               char *zone = strchr(secs, ' ');
+               time_t time = (time_t) atol(secs);
 
-               if (opt_line_number) {
-                       unsigned long real_lineno = view->offset + lineno + 1;
+               if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
+                       long tz;
 
-                       if (real_lineno == 1 ||
-                           (real_lineno % opt_num_interval) == 0) {
-                               wprintw(view->win, "%.*d", view->digits, real_lineno);
+                       zone++;
+                       tz  = ('0' - zone[1]) * 60 * 60 * 10;
+                       tz += ('0' - zone[2]) * 60 * 60;
+                       tz += ('0' - zone[3]) * 60;
+                       tz += ('0' - zone[4]) * 60;
 
-                       } else {
-                               waddnstr(view->win, spaces,
-                                        MIN(view->digits, STRING_SIZE(spaces)));
-                       }
-                       waddstr(view->win, ": ");
-                       col_offset = view->digits + 2;
+                       if (zone[0] == '-')
+                               tz = -tz;
+
+                       time -= tz;
                }
 
-               while (text && col_offset + col < view->width) {
-                       int cols_max = view->width - col_offset - col;
-                       char *pos = text;
-                       int cols;
+               gmtime_r(&time, tm);
+       }
+}
 
-                       if (*text == '\t') {
-                               text++;
-                               assert(sizeof(spaces) > TABSIZE);
-                               pos = spaces;
-                               cols = opt_tab_size - (col % opt_tab_size);
+static enum input_status
+select_commit_parent_handler(void *data, char *buf, int c)
+{
+       size_t parents = *(size_t *) data;
+       int parent = 0;
 
-                       } else {
-                               text = strchr(text, '\t');
-                               cols = line ? text - pos : strlen(pos);
-                       }
+       if (!isdigit(c))
+               return INPUT_SKIP;
 
-                       waddnstr(view->win, pos, MIN(cols, cols_max));
-                       col += cols;
-               }
+       if (*buf)
+               parent = atoi(buf) * 10;
+       parent += c - '0';
 
-       } else {
-               int tilde_attr = get_line_attr(LINE_MAIN_DELIM);
+       if (parent > parents)
+               return INPUT_SKIP;
+       return INPUT_OK;
+}
+
+static bool
+select_commit_parent(const char *id, char rev[SIZEOF_REV])
+{
+       char buf[SIZEOF_STR * 4];
+       const char *revlist_argv[] = {
+               "git", "rev-list", "-1", "--parents", id, NULL
+       };
+       int parents;
+
+       if (!run_io_buf(revlist_argv, buf, sizeof(buf)) ||
+           !*chomp_string(buf) ||
+           (parents = (strlen(buf) / 40) - 1) < 0) {
+               report("Failed to get parent information");
+               return FALSE;
+
+       } else if (parents == 0) {
+               report("The selected commit has no parents");
+               return FALSE;
+       }
 
-               draw_text(view, text, view->width, TRUE, tilde_attr);
+       if (parents > 1) {
+               char prompt[SIZEOF_STR];
+               char *result;
+
+               if (!string_format(prompt, "Which parent? [1..%d] ", parents))
+                       return FALSE;
+               result = prompt_input(prompt, select_commit_parent_handler, &parents);
+               if (!result)
+                       return FALSE;
+               parents = atoi(result);
        }
 
+       string_copy_rev(rev, &buf[41 * parents]);
        return TRUE;
 }
 
+/*
+ * Pager backend
+ */
+
 static bool
-add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
+pager_draw(struct view *view, struct line *line, unsigned int lineno)
 {
-       char refbuf[SIZEOF_STR];
-       char *ref = NULL;
-       FILE *pipe;
+       char *text = line->data;
 
-       if (!string_format(refbuf, "git describe %s 2>/dev/null", commit_id))
+       if (opt_line_number && draw_lineno(view, lineno))
                return TRUE;
 
-       pipe = popen(refbuf, "r");
-       if (!pipe)
-               return TRUE;
+       draw_text(view, line->type, text, TRUE);
+       return TRUE;
+}
+
+static bool
+add_describe_ref(char *buf, size_t *bufpos, const char *commit_id, const char *sep)
+{
+       const char *describe_argv[] = { "git", "describe", commit_id, NULL };
+       char refbuf[SIZEOF_STR];
+       char *ref = NULL;
 
-       if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
-               ref = chomp_string(ref);
-       pclose(pipe);
+       if (run_io_buf(describe_argv, refbuf, sizeof(refbuf)))
+               ref = chomp_string(refbuf);
 
        if (!ref || !*ref)
                return TRUE;
@@ -2795,8 +3486,8 @@ add_pager_refs(struct view *view, struct line *line)
 
        do {
                struct ref *ref = refs[refpos];
-               char *fmt = ref->tag    ? "%s[%s]" :
-                           ref->remote ? "%s<%s>" : "%s%s";
+               const char *fmt = ref->tag    ? "%s[%s]" :
+                                 ref->remote ? "%s<%s>" : "%s%s";
 
                if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
                        return;
@@ -2815,9 +3506,6 @@ 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);
 }
 
@@ -2900,6 +3588,7 @@ pager_select(struct view *view, struct line *line)
 static struct view_ops pager_ops = {
        "line",
        NULL,
+       NULL,
        pager_read,
        pager_draw,
        pager_request,
@@ -2907,35 +3596,68 @@ static struct view_ops pager_ops = {
        pager_select,
 };
 
+static const char *log_argv[SIZEOF_ARG] = {
+       "git", "log", "--no-color", "--cc", "--stat", "-n100", "%(head)", NULL
+};
 
-/*
- * Help backend
- */
-
-static bool
-help_open(struct view *view)
+static enum request
+log_request(struct view *view, enum request request, struct line *line)
 {
-       char buf[BUFSIZ];
-       int lines = ARRAY_SIZE(req_info) + 2;
-       int i;
+       switch (request) {
+       case REQ_REFRESH:
+               load_refs();
+               open_view(view, REQ_VIEW_LOG, OPEN_REFRESH);
+               return REQ_NONE;
+       default:
+               return pager_request(view, request, line);
+       }
+}
 
-       if (view->lines > 0)
-               return TRUE;
+static struct view_ops log_ops = {
+       "line",
+       log_argv,
+       NULL,
+       pager_read,
+       pager_draw,
+       log_request,
+       pager_grep,
+       pager_select,
+};
 
-       for (i = 0; i < ARRAY_SIZE(req_info); i++)
-               if (!req_info[i].request)
-                       lines++;
+static const char *diff_argv[SIZEOF_ARG] = {
+       "git", "show", "--pretty=fuller", "--no-color", "--root",
+               "--patch-with-stat", "--find-copies-harder", "-C", "%(commit)", NULL
+};
 
-       lines += run_requests + 1;
+static struct view_ops diff_ops = {
+       "line",
+       diff_argv,
+       NULL,
+       pager_read,
+       pager_draw,
+       pager_request,
+       pager_grep,
+       pager_select,
+};
 
-       view->line = calloc(lines, sizeof(*view->line));
-       if (!view->line)
-               return FALSE;
+/*
+ * Help backend
+ */
+
+static bool
+help_open(struct view *view)
+{
+       char buf[SIZEOF_STR];
+       size_t bufpos;
+       int i;
+
+       if (view->lines > 0)
+               return TRUE;
 
        add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
 
        for (i = 0; i < ARRAY_SIZE(req_info); i++) {
-               char *key;
+               const char *key;
 
                if (req_info[i].request == REQ_NONE)
                        continue;
@@ -2950,10 +3672,14 @@ help_open(struct view *view)
                if (!*key)
                        key = "(no key defined)";
 
-               if (!string_format(buf, "    %-25s %s", key, req_info[i].help))
-                       continue;
+               for (bufpos = 0; bufpos <= req_info[i].namelen; bufpos++) {
+                       buf[bufpos] = tolower(req_info[i].name[bufpos]);
+                       if (buf[bufpos] == '_')
+                               buf[bufpos] = '-';
+               }
 
-               add_line_text(view, buf, LINE_DEFAULT);
+               add_line_format(view, LINE_DEFAULT, "    %-25s %-20s %s",
+                               key, buf, req_info[i].help);
        }
 
        if (run_requests) {
@@ -2963,7 +3689,8 @@ help_open(struct view *view)
 
        for (i = 0; i < run_requests; i++) {
                struct run_request *req = get_run_request(REQ_NONE + i + 1);
-               char *key;
+               const char *key;
+               int argc;
 
                if (!req)
                        continue;
@@ -2972,12 +3699,13 @@ help_open(struct view *view)
                if (!*key)
                        key = "(no key defined)";
 
-               if (!string_format(buf, "    %-10s %-14s `%s`",
-                                  keymap_table[req->keymap].name,
-                                  key, req->cmd))
-                       continue;
+               for (bufpos = 0, argc = 0; req->argv[argc]; argc++)
+                       if (!string_format_from(buf, &bufpos, "%s%s",
+                                               argc ? " " : "", req->argv[argc]))
+                               return REQ_NONE;
 
-               add_line_text(view, buf, LINE_DEFAULT);
+               add_line_format(view, LINE_DEFAULT, "    %-10s %-14s `%s`",
+                               keymap_table[req->keymap].name, key, buf);
        }
 
        return TRUE;
@@ -2985,6 +3713,7 @@ help_open(struct view *view)
 
 static struct view_ops help_ops = {
        "line",
+       NULL,
        help_open,
        NULL,
        pager_draw,
@@ -3020,7 +3749,7 @@ pop_tree_stack_entry(void)
 }
 
 static void
-push_tree_stack_entry(char *name, unsigned long lineno)
+push_tree_stack_entry(const char *name, unsigned long lineno)
 {
        struct tree_stack_entry *entry = calloc(1, sizeof(*entry));
        size_t pathlen = strlen(opt_path);
@@ -3053,91 +3782,180 @@ push_tree_stack_entry(char *name, unsigned long lineno)
 #define SIZEOF_TREE_ATTR \
        STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
 
-#define TREE_UP_FORMAT "040000 tree %s\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;
+       struct tm time;                 /* Date from the author ident. */
+       char author[75];                /* Author of the commit. */
+       char name[1];
+};
+
+static const char *
+tree_path(struct line *line)
+{
+       return ((struct tree_entry *) line->data)->name;
+}
+
 
 static int
-tree_compare_entry(enum line_type type1, char *name1,
-                  enum line_type type2, char *name2)
+tree_compare_entry(struct line *line1, struct line *line2)
+{
+       if (line1->type != line2->type)
+               return line1->type == LINE_TREE_DIR ? -1 : 1;
+       return strcmp(tree_path(line1), tree_path(line2));
+}
+
+static struct line *
+tree_entry(struct view *view, enum line_type type, const char *path,
+          const char *mode, const char *id)
 {
-       if (type1 != type2) {
-               if (type1 == LINE_TREE_DIR)
-                       return -1;
-               return 1;
+       struct tree_entry *entry = calloc(1, sizeof(*entry) + strlen(path));
+       struct line *line = entry ? add_line_data(view, entry, type) : NULL;
+
+       if (!entry || !line) {
+               free(entry);
+               return NULL;
        }
 
-       return strcmp(name1, name2);
+       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 char author_name[SIZEOF_STR];
+       static struct tm author_time;
 
-       if (textlen <= SIZEOF_TREE_ATTR)
+       if (!text && *read_date) {
+               *read_date = FALSE;
+               return TRUE;
+
+       } 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 (!run_io_rd(&io, log_file, 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, sizeof(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_prefix && !strncmp(text, opt_prefix, strlen(opt_prefix)))
+                       text += strlen(opt_prefix);
+               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;
+
+                       string_copy(entry->author, author_name);
+                       memcpy(&entry->time, &author_time, sizeof(entry->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_PARENT, 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];
-               char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
-               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;
@@ -3146,23 +3964,101 @@ 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_PARENT) {
+               if (draw_text(view, line->type, "Directory path /", TRUE))
+                       return TRUE;
+       } else {
+               char mode[11] = "-r--r--r--";
+
+               if (S_ISDIR(entry->mode)) {
+                       mode[3] = mode[6] = mode[9] = 'x';
+                       mode[0] = 'd';
+               }
+               if (S_ISLNK(entry->mode))
+                       mode[0] = 'l';
+               if (entry->mode & S_IWUSR)
+                       mode[2] = 'w';
+               if (entry->mode & S_IXUSR)
+                       mode[3] = 'x';
+               if (entry->mode & S_IXGRP)
+                       mode[6] = 'x';
+               if (entry->mode & S_IXOTH)
+                       mode[9] = 'x';
+               if (draw_field(view, LINE_TREE_MODE, mode, 11, TRUE))
+                       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)
 {
        enum open_flags flags;
 
-       if (request == REQ_TREE_PARENT) {
-               if (*opt_path) {
-                       /* fake 'cd  ..' */
-                       request = REQ_ENTER;
-                       line = &view->line[1];
+       switch (request) {
+       case REQ_VIEW_BLAME:
+               if (line->type != LINE_TREE_FILE) {
+                       report("Blame only supported for files");
+                       return REQ_NONE;
+               }
+
+               string_copy(opt_ref, view->vid);
+               return request;
+
+       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_PARENT:
+               if (!*opt_path) {
                        /* quit view if at top of tree */
                        return REQ_VIEW_CLOSE;
                }
-       }
-       if (request != REQ_ENTER)
+               /* fake 'cd  ..' */
+               line = &view->line[1];
+               break;
+
+       case REQ_ENTER:
+               break;
+
+       default:
                return request;
+       }
 
        /* Cleanup the stack if the tree view is at a different tree. */
        while (!*opt_path && tree_stack)
@@ -3176,8 +4072,7 @@ tree_request(struct view *view, enum request request, struct line *line)
                        pop_tree_stack_entry();
 
                } else {
-                       char *data = line->data;
-                       char *basename = data + SIZEOF_TREE_ATTR;
+                       const char *basename = tree_path(line);
 
                        push_tree_stack_entry(basename, view->lineno);
                }
@@ -3194,13 +4089,12 @@ 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;
 }
@@ -3208,23 +4102,29 @@ tree_request(struct view *view, enum request request, struct line *line)
 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 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_select,
@@ -3233,20 +4133,426 @@ static struct view_ops tree_ops = {
 static bool
 blob_read(struct view *view, char *line)
 {
+       if (!line)
+               return TRUE;
        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,
 };
 
-
+/*
+ * Blame backend
+ *
+ * Loading the blame view is a two phase job:
+ *
+ *  1. File content is read either using opt_file from the
+ *     filesystem or using git-cat-file.
+ *  2. Then blame information is incrementally added by
+ *     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. */
+       char filename[128];             /* Name of file. */
+       bool has_previous;              /* Was a "previous" line detected. */
+};
+
+struct blame {
+       struct blame_commit *commit;
+       char text[1];
+};
+
+static bool
+blame_open(struct view *view)
+{
+       if (*opt_ref || !io_open(&view->io, opt_file)) {
+               if (!run_io_rd(&view->io, blame_cat_file_argv, FORMAT_ALL))
+                       return FALSE;
+       }
+
+       setup_update(view, opt_file);
+       string_format(view->ref, "%s ...", opt_file);
+
+       return TRUE;
+}
+
+static struct blame_commit *
+get_blame_commit(struct view *view, const char *id)
+{
+       size_t i;
+
+       for (i = 0; i < view->lines; i++) {
+               struct blame *blame = view->line[i].data;
+
+               if (!blame->commit)
+                       continue;
+
+               if (!strncmp(blame->commit->id, id, SIZEOF_REV - 1))
+                       return blame->commit;
+       }
+
+       {
+               struct blame_commit *commit = calloc(1, sizeof(*commit));
+
+               if (commit)
+                       string_ncopy(commit->id, id, SIZEOF_REV);
+               return commit;
+       }
+}
+
+static bool
+parse_number(const char **posref, size_t *number, size_t min, size_t max)
+{
+       const char *pos = *posref;
+
+       *posref = NULL;
+       pos = strchr(pos + 1, ' ');
+       if (!pos || !isdigit(pos[1]))
+               return FALSE;
+       *number = atoi(pos + 1);
+       if (*number < min || *number > max)
+               return FALSE;
+
+       *posref = pos;
+       return TRUE;
+}
+
+static struct blame_commit *
+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;
+       size_t lineno;
+       size_t group;
+
+       if (strlen(text) <= SIZEOF_REV || *pos != ' ')
+               return NULL;
+
+       if (!parse_number(&pos, &lineno, 1, view->lines) ||
+           !parse_number(&pos, &group, 1, view->lines - lineno + 1))
+               return NULL;
+
+       commit = get_blame_commit(view, text);
+       if (!commit)
+               return NULL;
+
+       *blamed += group;
+       while (group--) {
+               struct line *line = &view->line[lineno + group - 1];
+
+               blame = line->data;
+               blame->commit = commit;
+               line->dirty = 1;
+       }
+
+       return commit;
+}
+
+static bool
+blame_read_file(struct view *view, const char *line, bool *read_file)
+{
+       if (!line) {
+               const char **argv = *opt_ref ? blame_ref_argv : blame_head_argv;
+               struct io io = {};
+
+               if (view->lines == 0 && !view->parent)
+                       die("No blame exist for %s", view->vid);
+
+               if (view->lines == 0 || !run_io_rd(&io, argv, FORMAT_ALL)) {
+                       report("Failed to load blame data");
+                       return TRUE;
+               }
+
+               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);
+
+               blame->commit = NULL;
+               strncpy(blame->text, line, linelen);
+               blame->text[linelen] = 0;
+               return add_line_data(view, blame, LINE_BLAME_ID) != NULL;
+       }
+}
+
+static bool
+match_blame_header(const char *name, char **line)
+{
+       size_t namelen = strlen(name);
+       bool matched = !strncmp(name, *line, namelen);
+
+       if (matched)
+               *line += namelen;
+
+       return matched;
+}
+
+static bool
+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 (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);
+                       redraw_view_from(view, 0);
+               }
+               return TRUE;
+       }
+
+       if (!commit) {
+               commit = parse_blame_commit(view, line, &blamed);
+               string_format(view->ref, "%s %2d%%", view->vid,
+                             view->lines ? blamed * 100 / view->lines : 0);
+
+       } else if (match_blame_header("author ", &line)) {
+               string_ncopy(commit->author, line, strlen(line));
+
+       } else if (match_blame_header("author-time ", &line)) {
+               author_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);
+
+       } 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;
+       }
+
+       return TRUE;
+}
+
+static bool
+blame_draw(struct view *view, struct line *line, unsigned int lineno)
+{
+       struct blame *blame = line->data;
+       struct tm *time = NULL;
+       const char *id = NULL, *author = NULL;
+
+       if (blame->commit && *blame->commit->filename) {
+               id = blame->commit->id;
+               author = blame->commit->author;
+               time = &blame->commit->time;
+       }
+
+       if (opt_date && draw_date(view, time))
+               return TRUE;
+
+       if (opt_author && draw_author(view, author))
+               return TRUE;
+
+       if (draw_field(view, LINE_BLAME_ID, id, ID_COLS, FALSE))
+               return TRUE;
+
+       if (draw_lineno(view, lineno))
+               return TRUE;
+
+       draw_text(view, LINE_DEFAULT, blame->text, TRUE);
+       return TRUE;
+}
+
+static bool
+check_blame_commit(struct blame *blame)
+{
+       if (!blame->commit)
+               report("Commit data not loaded yet");
+       else if (!strcmp(blame->commit->id, NULL_ID))
+               report("No commit exist for the selected line");
+       else
+               return TRUE;
+       return FALSE;
+}
+
+static enum request
+blame_request(struct view *view, enum request request, struct line *line)
+{
+       enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
+       struct blame *blame = line->data;
+
+       switch (request) {
+       case REQ_VIEW_BLAME:
+               if (check_blame_commit(blame)) {
+                       string_copy(opt_ref, blame->commit->id);
+                       open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
+               }
+               break;
+
+       case REQ_PARENT:
+               if (check_blame_commit(blame) &&
+                   select_commit_parent(blame->commit->id, opt_ref))
+                       open_view(view, REQ_VIEW_BLAME, OPEN_REFRESH);
+               break;
+
+       case REQ_ENTER:
+               if (!blame->commit) {
+                       report("No commit loaded yet");
+                       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)) {
+                       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 (!prepare_update(diff, diff_index_argv, NULL, FORMAT_DASH)) {
+                               report("Failed to allocate diff command");
+                               break;
+                       }
+                       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:
+               return request;
+       }
+
+       return REQ_NONE;
+}
+
+static bool
+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);
+
+#undef MATCH
+}
+
+static void
+blame_select(struct view *view, struct line *line)
+{
+       struct blame *blame = line->data;
+       struct blame_commit *commit = blame->commit;
+
+       if (!commit)
+               return;
+
+       if (!strcmp(commit->id, NULL_ID))
+               string_ncopy(ref_commit, "HEAD", 4);
+       else
+               string_copy_rev(ref_commit, commit->id);
+}
+
+static struct view_ops blame_ops = {
+       "line",
+       NULL,
+       blame_open,
+       blame_read,
+       blame_draw,
+       blame_request,
+       blame_grep,
+       blame_select,
+};
+
 /*
  * Status backend
  */
@@ -3265,22 +4571,32 @@ struct status {
        } new;
 };
 
+static char status_onbranch[SIZEOF_STR];
 static struct status stage_status;
 static enum line_type stage_line_type;
+static size_t stage_chunks;
+static int *stage_chunk;
+
+/* This should work even for the "On branch" line. */
+static inline bool
+status_has_none(struct view *view, struct line *line)
+{
+       return line < view->line + view->lines && !line[1].data;
+}
 
 /* Get fields from the diff line:
  * :100644 100644 06a5d6ae9eca55be2e0e585a152e6b1336f2b20e 0000000000000000000000000000000000000000 M
  */
 static inline bool
-status_get_diff(struct status *file, char *buf, size_t bufsize)
+status_get_diff(struct status *file, const char *buf, size_t bufsize)
 {
-       char *old_mode = buf +  1;
-       char *new_mode = buf +  8;
-       char *old_rev  = buf + 15;
-       char *new_rev  = buf + 56;
-       char *status   = buf + 97;
+       const char *old_mode = buf +  1;
+       const char *new_mode = buf +  8;
+       const char *old_rev  = buf + 15;
+       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]  != ' ' ||
@@ -3302,128 +4618,136 @@ status_get_diff(struct status *file, char *buf, size_t bufsize)
 }
 
 static bool
-status_run(struct view *view, const char cmd[], bool diff, 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))) {
+               if (!file) {
+                       file = calloc(1, sizeof(*file));
+                       if (!file || !add_line_data(view, file, type))
+                               goto error_out;
+               }
 
-               readsize = fread(buf + bufsize, 1, sizeof(buf) - bufsize, pipe);
-               if (!readsize)
-                       break;
-               bufsize += readsize;
+               /* Parse diff info part. */
+               if (status) {
+                       file->status = status;
+                       if (status == 'A')
+                               string_copy(file->old.rev, NULL_ID);
 
-               /* Process while we have NUL chars. */
-               while ((sep = memchr(buf, 0, bufsize))) {
-                       size_t sepsize = sep - buf + 1;
+               } else if (!file->status) {
+                       if (!status_get_diff(file, buf, strlen(buf)))
+                               goto error_out;
 
-                       if (!file) {
-                               if (!realloc_lines(view, view->line_size + 1))
-                                       goto error_out;
+                       buf = io_get(&io, 0, TRUE);
+                       if (!buf)
+                               break;
 
-                               file = calloc(1, sizeof(*file));
-                               if (!file)
-                                       goto error_out;
+                       /* Collapse all 'M'odified entries that follow a
+                        * associated 'U'nmerged entry. */
+                       if (file->status == 'U') {
+                               unmerged = file;
 
-                               add_line_data(view, file, type);
-                       }
+                       } else if (unmerged) {
+                               int collapse = !strcmp(buf, unmerged->new.name);
 
-                       /* Parse diff info part. */
-                       if (!diff) {
-                               file->status = '?';
-
-                       } else if (!file->status) {
-                               if (!status_get_diff(file, buf, sepsize))
-                                       goto error_out;
-
-                               bufsize -= sepsize;
-                               memmove(buf, sep + 1, bufsize);
-
-                               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;
-                                       }
+                               unmerged = NULL;
+                               if (collapse) {
+                                       free(file);
+                                       file = NULL;
+                                       view->lines--;
+                                       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);
-
-                               sep = memchr(buf, 0, bufsize);
-                               if (!sep)
-                                       break;
-                               sepsize = sep - buf + 1;
-                       }
+               /* 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));
 
-                       /* 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;
+                       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 (ferror(pipe)) {
+       if (io_error(&io)) {
 error_out:
-               pclose(pipe);
+               done_io(&io);
                return FALSE;
        }
 
        if (!view->line[view->lines - 1].data)
                add_line_data(view, NULL, LINE_STAT_NONE);
 
-       pclose(pipe);
+       done_io(&io);
        return TRUE;
 }
 
 /* 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-per-directory=.gitignore"
+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
+};
 
-#define STATUS_DIFF_INDEX_SHOW_CMD \
-       "git diff-index --root --patch-with-stat -C -M --cached HEAD -- %s %s 2>/dev/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 the above fails, always skip the "On branch" line. */
+       if (view->p_lineno < view->lines)
+               view->lineno = view->p_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;
 
-#define STATUS_DIFF_FILES_SHOW_CMD \
-       "git diff-files --root --patch-with-stat -C -M -- %s %s 2>/dev/null"
+       view->p_restore = FALSE;
+}
 
 /* First parse staged info using git-diff-index(1), then parse unstaged
  * info using git-diff-files(1), and finally untracked files using
@@ -3431,108 +4755,84 @@ error_out:
 static bool
 status_open(struct view *view)
 {
-       struct stat statbuf;
-       char exclude[SIZEOF_STR];
-       char cmd[SIZEOF_STR];
-       unsigned long prev_lineno = view->lineno;
-       size_t i;
-
-       for (i = 0; i < view->lines; i++)
-               free(view->line[i].data);
-       free(view->line);
-       view->lines = view->line_alloc = view->line_size = view->lineno = 0;
-       view->line = NULL;
-
-       if (!realloc_lines(view, view->line_size + 6))
-               return FALSE;
-
-       if (!string_format(exclude, "%s/info/exclude", opt_git_dir))
+       reset_view(view);
+
+       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;
 
-       string_copy(cmd, STATUS_LIST_OTHER_CMD);
+       run_io_bg(update_index_argv);
 
-       if (stat(exclude, &statbuf) >= 0) {
-               size_t cmdsize = strlen(cmd);
-
-               if (!string_format_from(cmd, &cmdsize, " %s", "--exclude-from=") ||
-                   sq_quote(cmd, cmdsize, exclude) >= sizeof(cmd))
+       if (is_initial_commit()) {
+               if (!status_run(view, status_list_no_head_argv, 'A', LINE_STAT_STAGED))
                        return FALSE;
+       } else if (!status_run(view, status_diff_index_argv, 0, LINE_STAT_STAGED)) {
+               return FALSE;
        }
 
-       system("git update-index -q --refresh");
-
-       if (!status_run(view, STATUS_DIFF_INDEX_CMD, TRUE, LINE_STAT_STAGED) ||
-           !status_run(view, STATUS_DIFF_FILES_CMD, TRUE, LINE_STAT_UNSTAGED) ||
-           !status_run(view, cmd, FALSE, 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. */
-       if (prev_lineno < view->lines)
-               view->lineno = prev_lineno;
-       else
-               view->lineno = view->lines - 1;
-
+       /* Restore the exact position or use the specialized restore
+        * mode? */
+       if (!view->p_restore)
+               status_restore(view);
        return TRUE;
 }
 
 static bool
-status_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
+status_draw(struct view *view, struct line *line, unsigned int lineno)
 {
        struct status *status = line->data;
-       int tilde_attr = get_line_attr(LINE_MAIN_DELIM);
-
-       wmove(view->win, lineno, 0);
-
-       if (selected) {
-               wattrset(view->win, get_line_attr(LINE_CURSOR));
-               wchgat(view->win, -1, 0, LINE_CURSOR, NULL);
-               tilde_attr = -1;
-
-       } else if (!status && line->type != LINE_STAT_NONE) {
-               wattrset(view->win, get_line_attr(LINE_STAT_SECTION));
-               wchgat(view->win, -1, 0, LINE_STAT_SECTION, NULL);
-
-       } else {
-               wattrset(view->win, get_line_attr(line->type));
-       }
+       enum line_type type;
+       const char *text;
 
        if (!status) {
-               char *text;
-
                switch (line->type) {
                case LINE_STAT_STAGED:
+                       type = LINE_STAT_SECTION;
                        text = "Changes to be committed:";
                        break;
 
                case LINE_STAT_UNSTAGED:
+                       type = LINE_STAT_SECTION;
                        text = "Changed but not updated:";
                        break;
 
                case LINE_STAT_UNTRACKED:
+                       type = LINE_STAT_SECTION;
                        text = "Untracked files:";
                        break;
 
                case LINE_STAT_NONE:
+                       type = LINE_DEFAULT;
                        text = "    (no files)";
                        break;
 
+               case LINE_STAT_HEAD:
+                       type = LINE_STAT_HEAD;
+                       text = status_onbranch;
+                       break;
+
                default:
                        return FALSE;
                }
+       } else {
+               static char buf[] = { '?', ' ', ' ', ' ', 0 };
 
-               draw_text(view, text, view->width, TRUE, tilde_attr);
-               return TRUE;
+               buf[0] = status->status;
+               if (draw_text(view, line->type, buf, TRUE))
+                       return TRUE;
+               type = LINE_DEFAULT;
+               text = status->new.name;
        }
 
-       waddch(view->win, status->status);
-       if (!selected)
-               wattrset(view->win, A_NORMAL);
-       wmove(view->win, lineno, 4);
-       if (view->width < 5)
-               return TRUE;
-
-       draw_text(view, status->new.name, view->width - 5, TRUE, tilde_attr);
+       draw_text(view, type, text, TRUE);
        return TRUE;
 }
 
@@ -3540,10 +4840,13 @@ static enum request
 status_enter(struct view *view, struct line *line)
 {
        struct status *status = line->data;
-       char oldpath[SIZEOF_STR] = "";
-       char newpath[SIZEOF_STR] = "";
-       char *info;
-       size_t cmdsize = 0;
+       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;
+       enum open_flags split;
+       struct view *stage = VIEW(REQ_VIEW_STAGE);
 
        if (line->type == LINE_STAT_NONE ||
            (!status && line[1].type == LINE_STAT_NONE)) {
@@ -3551,26 +4854,27 @@ 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 (!string_format_from(opt_cmd, &cmdsize,
-                                       STATUS_DIFF_INDEX_SHOW_CMD, oldpath, newpath))
-                       return REQ_QUIT;
+               if (is_initial_commit()) {
+                       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 REQ_QUIT;
+               } else {
+                       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 REQ_QUIT;
+               }
+
                if (status)
                        info = "Staged changes to %s";
                else
@@ -3578,34 +4882,45 @@ 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))
+       {
+               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 REQ_QUIT;
                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;
                }
 
-               opt_pipe = fopen(status->new.name, "r");
+               if (!suffixcmp(status->new.name, -1, "/")) {
+                       report("Cannot display a directory");
+                       return REQ_NONE;
+               }
+
+               if (!prepare_update_file(stage, newpath))
+                       return REQ_QUIT;
                info = "Untracked file %s";
                break;
 
+       case LINE_STAT_HEAD:
+               return REQ_NONE;
+
        default:
                die("line type %d not handled in switch", line->type);
        }
 
-       open_view(view, REQ_VIEW_STAGE, OPEN_RELOAD | OPEN_SPLIT);
+       split = view_is_displayed(view) ? OPEN_SPLIT : 0;
+       open_view(view, REQ_VIEW_STAGE, OPEN_PREPARED | split);
        if (view_is_displayed(VIEW(REQ_VIEW_STAGE))) {
                if (status) {
                        stage_status = *status;
@@ -3614,68 +4929,139 @@ status_enter(struct view *view, struct line *line)
                }
 
                stage_line_type = line->type;
+               stage_chunks = 0;
                string_format(VIEW(REQ_VIEW_STAGE)->ref, info, stage_status.new.name);
        }
 
        return REQ_NONE;
 }
 
+static bool
+status_exists(struct status *status, enum line_type type)
+{
+       struct view *view = VIEW(REQ_VIEW_STATUS);
+       unsigned long lineno;
+
+       for (lineno = 0; lineno < view->lines; lineno++) {
+               struct line *line = &view->line[lineno];
+               struct status *pos = line->data;
+
+               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 bool
-status_update_file(struct view *view, struct status *status, enum line_type type)
+status_update_prepare(struct io *io, enum line_type type)
 {
-       char cmd[SIZEOF_STR];
-       char buf[SIZEOF_STR];
-       size_t cmdsize = 0;
-       size_t bufsize = 0;
-       size_t written = 0;
-       FILE *pipe;
+       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:
+               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:
+               return run_io(io, others_argv, NULL, IO_WR);
 
-       if (opt_cdup[0] &&
-           type != LINE_STAT_UNTRACKED &&
-           !string_format_from(cmd, &cmdsize, "cd %s;", opt_cdup))
+       default:
+               die("line type %d not handled in switch", type);
                return FALSE;
+       }
+}
+
+static bool
+status_update_write(struct io *io, struct status *status, enum line_type type)
+{
+       char buf[SIZEOF_STR];
+       size_t bufsize = 0;
 
        switch (type) {
        case LINE_STAT_STAGED:
                if (!string_format_from(buf, &bufsize, "%06o %s\t%s%c",
-                                       status->old.mode,
+                                       status->old.mode,
                                        status->old.rev,
                                        status->old.name, 0))
                        return FALSE;
-
-               string_add(cmd, cmdsize, "git update-index -z --index-info");
                break;
 
        case LINE_STAT_UNSTAGED:
        case LINE_STAT_UNTRACKED:
                if (!string_format_from(buf, &bufsize, "%s%c", status->new.name, 0))
                        return FALSE;
-
-               string_add(cmd, cmdsize, "git update-index -z --add --remove --stdin");
                break;
 
        default:
                die("line type %d not handled in switch", type);
        }
 
-       pipe = popen(cmd, "w");
-       if (!pipe)
+       return io_write(io, buf, bufsize);
+}
+
+static bool
+status_update_file(struct status *status, enum line_type type)
+{
+       struct io io = {};
+       bool result;
+
+       if (!status_update_prepare(&io, type))
                return FALSE;
 
-       while (!ferror(pipe) && written < bufsize) {
-               written += fwrite(buf + written, 1, bufsize - written, pipe);
-       }
+       result = status_update_write(&io, status, type);
+       done_io(&io);
+       return result;
+}
 
-       pclose(pipe);
+static bool
+status_update_files(struct view *view, struct line *line)
+{
+       struct io io = {};
+       bool result = TRUE;
+       struct line *pos = view->line + view->lines;
+       int files = 0;
+       int file, done;
 
-       if (written != bufsize)
+       if (!status_update_prepare(&io, line->type))
                return FALSE;
 
-       return TRUE;
+       for (pos = line; pos < view->line + view->lines && pos->data; pos++)
+               files++;
+
+       for (file = 0, done = 0; result && file < files; line++, file++) {
+               int almost_done = file * 100 / files;
+
+               if (almost_done > done) {
+                       done = almost_done;
+                       string_format(view->ref, "updating file %u of %u (%d%% done)",
+                                     file, files, done);
+                       update_view_title(view);
+               }
+               result = status_update_write(&io, line->data, line->type);
+       }
+
+       done_io(&io);
+       return result;
 }
 
-static void
+static bool
 status_update(struct view *view)
 {
        struct line *line = &view->line[view->lineno];
@@ -3683,18 +5069,48 @@ status_update(struct view *view)
        assert(view->lines);
 
        if (!line->data) {
-               while (++line < view->line + view->lines && line->data) {
-                       if (!status_update_file(view, line->data, line->type))
-                               report("Failed to update file status");
+               /* This should work even for the "On branch" line. */
+               if (line < view->line + view->lines && !line[1].data) {
+                       report("Nothing to update");
+                       return FALSE;
                }
 
-               if (!line[-1].data) {
-                       report("Nothing to update");
-                       return;
+               if (!status_update_files(view, line + 1)) {
+                       report("Failed to update file status");
+                       return FALSE;
                }
 
-       } else if (!status_update_file(view, line->data, line->type)) {
+       } else if (!status_update_file(line->data, line->type)) {
                report("Failed to update file status");
+               return FALSE;
+       }
+
+       return TRUE;
+}
+
+static bool
+status_revert(struct status *status, enum line_type type, bool has_none)
+{
+       if (!status || type != LINE_STAT_UNSTAGED) {
+               if (type == LINE_STAT_STAGED) {
+                       report("Cannot revert changes to staged files");
+               } else if (type == LINE_STAT_UNTRACKED) {
+                       report("Cannot revert changes to untracked files");
+               } else if (has_none) {
+                       report("Nothing to revert");
+               } else {
+                       report("Cannot revert changes to multiple files");
+               }
+               return FALSE;
+
+       } else {
+               const char *checkout_argv[] = {
+                       "git", "checkout", "--", status->old.name, NULL
+               };
+
+               if (!prompt_yesno("Are you sure you want to overwrite any changes?"))
+                       return FALSE;
+               return run_io_fg(checkout_argv, opt_cdup);
        }
 }
 
@@ -3705,7 +5121,13 @@ status_request(struct view *view, enum request request, struct line *line)
 
        switch (request) {
        case REQ_STATUS_UPDATE:
-               status_update(view);
+               if (!status_update(view))
+                       return REQ_NONE;
+               break;
+
+       case REQ_STATUS_REVERT:
+               if (!status_revert(status, line->type, status_has_none(view, line)))
+                       return REQ_NONE;
                break;
 
        case REQ_STATUS_MERGE:
@@ -3719,10 +5141,21 @@ status_request(struct view *view, enum request request, struct line *line)
        case REQ_EDIT:
                if (!status)
                        return request;
+               if (status->status == 'D') {
+                       report("File has been deleted.");
+                       return REQ_NONE;
+               }
 
                open_editor(status->status != '?', status->new.name);
                break;
 
+       case REQ_VIEW_BLAME:
+               if (status) {
+                       string_copy(opt_file, status->new.name);
+                       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
@@ -3748,8 +5181,8 @@ status_select(struct view *view, struct line *line)
 {
        struct status *status = line->data;
        char file[SIZEOF_STR] = "all files";
-       char *text;
-       char *key;
+       const char *text;
+       const char *key;
 
        if (status && !string_format(file, "'%s'", status->new.name))
                return;
@@ -3770,6 +5203,7 @@ status_select(struct view *view, struct line *line)
                text = "Press %s to stage %s for addition";
                break;
 
+       case LINE_STAT_HEAD:
        case LINE_STAT_NONE:
                text = "Nothing to update";
                break;
@@ -3801,7 +5235,7 @@ status_grep(struct view *view, struct line *line)
                return FALSE;
 
        for (state = S_STATUS; state < S_END; state++) {
-               char *text;
+               const char *text;
 
                switch (state) {
                case S_NAME:    text = status->new.name;        break;
@@ -3823,6 +5257,7 @@ status_grep(struct view *view, struct line *line)
 
 static struct view_ops status_ops = {
        "file",
+       NULL,
        status_open,
        NULL,
        status_draw,
@@ -3833,131 +5268,157 @@ static struct view_ops status_ops = {
 
 
 static bool
-stage_diff_line(FILE *pipe, struct line *line)
+stage_diff_write(struct io *io, struct line *line, struct line *end)
 {
-       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);
+       while (line < end) {
+               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;
        }
 
-       fputc('\n', pipe);
-
-       return written == bufsize;
+       return TRUE;
 }
 
 static struct line *
-stage_diff_hdr(struct view *view, struct line *line)
+stage_diff_find(struct view *view, struct line *line, enum line_type type)
 {
-       int diff_hdr_dir = line->type == LINE_DIFF_CHUNK ? -1 : 1;
-       struct line *diff_hdr;
-
-       if (line->type == LINE_DIFF_CHUNK)
-               diff_hdr = line - 1;
-       else
-               diff_hdr = view->line + 1;
-
-       while (diff_hdr > view->line && diff_hdr < view->line + view->lines) {
-               if (diff_hdr->type == LINE_DIFF_HEADER)
-                       return diff_hdr;
-
-               diff_hdr += diff_hdr_dir;
-       }
+       for (; view->line < line; line--)
+               if (line->type == type)
+                       return line;
 
        return NULL;
 }
 
 static bool
-stage_update_chunk(struct view *view, struct line *line)
+stage_apply_chunk(struct view *view, struct line *chunk, bool revert)
 {
-       char cmd[SIZEOF_STR];
-       size_t cmdsize = 0;
-       struct line *diff_hdr, *diff_chunk, *diff_end;
-       FILE *pipe;
+       const char *apply_argv[SIZEOF_ARG] = {
+               "git", "apply", "--whitespace=nowarn", NULL
+       };
+       struct line *diff_hdr;
+       struct io io = {};
+       int argc = 3;
 
-       diff_hdr = stage_diff_hdr(view, line);
+       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))
+       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 (!string_format_from(cmd, &cmdsize,
-                               "git apply --cached %s - && "
-                               "git update-index -q --unmerged --refresh 2>/dev/null",
-                               stage_line_type == LINE_STAT_STAGED ? "-R" : ""))
-               return FALSE;
+       if (!stage_diff_write(&io, diff_hdr, chunk) ||
+           !stage_diff_write(&io, chunk, view->line + view->lines))
+               chunk = NULL;
 
-       pipe = popen(cmd, "w");
-       if (!pipe)
-               return FALSE;
+       done_io(&io);
+       run_io_bg(update_index_argv);
 
-       diff_end = view->line + view->lines;
-       if (line->type != LINE_DIFF_CHUNK) {
-               diff_chunk = diff_hdr;
+       return chunk ? TRUE : FALSE;
+}
 
-       } else {
-               for (diff_chunk = line + 1; diff_chunk < diff_end; diff_chunk++)
-                       if (diff_chunk->type == LINE_DIFF_CHUNK ||
-                           diff_chunk->type == LINE_DIFF_HEADER)
-                               diff_end = diff_chunk;
-
-               diff_chunk = line;
-
-               while (diff_hdr->type != LINE_DIFF_CHUNK) {
-                       switch (diff_hdr->type) {
-                       case LINE_DIFF_HEADER:
-                       case LINE_DIFF_INDEX:
-                       case LINE_DIFF_ADD:
-                       case LINE_DIFF_DEL:
-                               break;
+static bool
+stage_update(struct view *view, struct line *line)
+{
+       struct line *chunk = NULL;
 
-                       default:
-                               diff_hdr++;
-                               continue;
-                       }
+       if (!is_initial_commit() && stage_line_type != LINE_STAT_UNTRACKED)
+               chunk = stage_diff_find(view, line, LINE_DIFF_CHUNK);
 
-                       if (!stage_diff_line(pipe, diff_hdr++)) {
-                               pclose(pipe);
-                               return FALSE;
-                       }
+       if (chunk) {
+               if (!stage_apply_chunk(view, chunk, FALSE)) {
+                       report("Failed to apply chunk");
+                       return FALSE;
                }
-       }
 
-       while (diff_chunk < diff_end && stage_diff_line(pipe, diff_chunk))
-               diff_chunk++;
+       } else if (!stage_status.status) {
+               view = VIEW(REQ_VIEW_STATUS);
+
+               for (line = view->line; line < view->line + view->lines; line++)
+                       if (line->type == stage_line_type)
+                               break;
 
-       pclose(pipe);
+               if (!status_update_files(view, line + 1)) {
+                       report("Failed to update files");
+                       return FALSE;
+               }
 
-       if (diff_chunk != diff_end)
+       } else if (!status_update_file(&stage_status, stage_line_type)) {
+               report("Failed to update file");
                return FALSE;
+       }
 
        return TRUE;
 }
 
-static void
-stage_update(struct view *view, struct line *line)
+static bool
+stage_revert(struct view *view, struct line *line)
 {
-       if (stage_line_type != LINE_STAT_UNTRACKED &&
-           (line->type == LINE_DIFF_CHUNK || !stage_status.status)) {
-               if (!stage_update_chunk(view, line)) {
-                       report("Failed to apply chunk");
-                       return;
+       struct line *chunk = NULL;
+
+       if (!is_initial_commit() && stage_line_type == LINE_STAT_UNSTAGED)
+               chunk = stage_diff_find(view, line, LINE_DIFF_CHUNK);
+
+       if (chunk) {
+               if (!prompt_yesno("Are you sure you want to revert changes?"))
+                       return FALSE;
+
+               if (!stage_apply_chunk(view, chunk, TRUE)) {
+                       report("Failed to revert chunk");
+                       return FALSE;
                }
+               return TRUE;
 
-       } else if (!status_update_file(view, &stage_status, stage_line_type)) {
-               report("Failed to update file");
-               return;
+       } else {
+               return status_revert(stage_status.status ? &stage_status : NULL,
+                                    stage_line_type, FALSE);
+       }
+}
+
+
+static void
+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) {
+                               report("Allocation failure");
+                               return;
+                       }
+
+                       stage_chunk = tmp;
+                       stage_chunk[stage_chunks++] = line - view->line;
+               }
        }
 
-       open_view(view, REQ_VIEW_STATUS, OPEN_RELOAD);
+       for (i = 0; i < stage_chunks; i++) {
+               if (stage_chunk[i] > view->lineno) {
+                       do_scroll_view(view, stage_chunk[i] - view->lineno);
+                       report("Chunk %d of %d", i + 1, stage_chunks);
+                       return;
+               }
+       }
 
-       view = VIEW(REQ_VIEW_STATUS);
-       if (view_is_displayed(view))
-               status_enter(view, &view->line[view->lineno]);
+       report("No next chunk found");
 }
 
 static enum request
@@ -3965,30 +5426,83 @@ stage_request(struct view *view, enum request request, struct line *line)
 {
        switch (request) {
        case REQ_STATUS_UPDATE:
-               stage_update(view, line);
+               if (!stage_update(view, line))
+                       return REQ_NONE;
+               break;
+
+       case REQ_STATUS_REVERT:
+               if (!stage_revert(view, line))
+                       return REQ_NONE;
                break;
 
+       case REQ_STAGE_NEXT:
+               if (stage_line_type == LINE_STAT_UNTRACKED) {
+                       report("File is untracked; press %s to add",
+                              get_key(REQ_STATUS_UPDATE));
+                       return REQ_NONE;
+               }
+               stage_next(view, line);
+               return REQ_NONE;
+
        case REQ_EDIT:
                if (!stage_status.new.name[0])
                        return request;
+               if (stage_status.status == 'D') {
+                       report("File has been deleted.");
+                       return REQ_NONE;
+               }
 
                open_editor(stage_status.status != '?', stage_status.new.name);
                break;
 
+       case REQ_REFRESH:
+               /* Reload everything ... */
+               break;
+
+       case REQ_VIEW_BLAME:
+               if (stage_status.new.name[0]) {
+                       string_copy(opt_file, stage_status.new.name);
+                       opt_ref[0] = 0;
+               }
+               return request;
+
        case REQ_ENTER:
-               pager_request(view, request, line);
-               break;
+               return pager_request(view, request, line);
 
        default:
                return request;
        }
 
+       VIEW(REQ_VIEW_STATUS)->p_restore = TRUE;
+       open_view(view, REQ_VIEW_STATUS, OPEN_RELOAD | OPEN_NOMAXIMIZE);
+
+       /* Check whether the staged entry still exists, and close the
+        * stage view if it doesn't. */
+       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, "/")) {
+                       report("Cannot display a directory");
+                       return REQ_NONE;
+               }
+
+               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);
+
        return REQ_NONE;
 }
 
 static struct view_ops stage_ops = {
        "line",
        NULL,
+       NULL,
        pager_read,
        pager_draw,
        stage_request,
@@ -4050,6 +5564,15 @@ append_to_rev_graph(struct rev_graph *graph, chtype symbol)
                commit->graph[commit->graph_size++] = symbol;
 }
 
+static void
+clear_rev_graph(struct rev_graph *graph)
+{
+       graph->boundary = 0;
+       graph->size = graph->pos = 0;
+       graph->commit = NULL;
+       memset(graph->parents, 0, sizeof(*graph->parents));
+}
+
 static void
 done_rev_graph(struct rev_graph *graph)
 {
@@ -4066,13 +5589,11 @@ done_rev_graph(struct rev_graph *graph)
                }
        }
 
-       graph->size = graph->pos = 0;
-       graph->commit = NULL;
-       memset(graph->parents, 0, sizeof(*graph->parents));
+       clear_rev_graph(graph);
 }
 
 static void
-push_rev_graph(struct rev_graph *graph, char *parent)
+push_rev_graph(struct rev_graph *graph, const char *parent)
 {
        int i;
 
@@ -4116,7 +5637,7 @@ draw_rev_graph(struct rev_graph *graph)
        };
        enum { DEFAULT, RSHARP, RDIAG, LDIAG };
        static struct rev_filler fillers[] = {
-               { ' ',  REVGRAPH_LINE },
+               { ' ',  '|' },
                { '`',  '.' },
                { '\'', ' ' },
                { '/',  ' ' },
@@ -4125,6 +5646,9 @@ draw_rev_graph(struct rev_graph *graph)
        struct rev_filler *filler;
        size_t i;
 
+       if (opt_line_graphics)
+               fillers[DEFAULT].line = line_graphics[LINE_GRAPHIC_VLINE];
+
        filler = &fillers[DEFAULT];
 
        for (i = 0; i < graph->pos; i++) {
@@ -4187,7 +5711,7 @@ 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)
@@ -4198,6 +5722,10 @@ 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);
 }
@@ -4207,116 +5735,59 @@ 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, bool selected)
+main_draw(struct view *view, struct line *line, unsigned int lineno)
 {
-       char buf[DATE_COLS + 1];
        struct commit *commit = line->data;
-       enum line_type type;
-       int col = 0;
-       size_t timelen;
-       int tilde_attr;
-       int space;
 
        if (!*commit->author)
                return FALSE;
 
-       space = view->width;
-       wmove(view->win, lineno, col);
-
-       if (selected) {
-               type = LINE_CURSOR;
-               wattrset(view->win, get_line_attr(type));
-               wchgat(view->win, -1, 0, type, NULL);
-               tilde_attr = -1;
-       } else {
-               type = LINE_MAIN_COMMIT;
-               wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
-               tilde_attr = get_line_attr(LINE_MAIN_DELIM);
-       }
-
-       if (opt_date) {
-               int n;
-
-               timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
-               n = draw_text(view, buf, view->width - col, FALSE, tilde_attr);
-               draw_text(view, " ", view->width - col - n, FALSE, tilde_attr);
-
-               col += DATE_COLS;
-               wmove(view->win, lineno, col);
-               if (col >= view->width)
-                       return TRUE;
-       }
-       if (type != LINE_CURSOR)
-               wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
-
-       if (opt_author) {
-               int max_len;
-
-               max_len = view->width - col;
-               if (max_len > AUTHOR_COLS - 1)
-                       max_len = AUTHOR_COLS - 1;
-               draw_text(view, commit->author, max_len, TRUE, tilde_attr);
-               col += AUTHOR_COLS;
-               if (col >= view->width)
-                       return TRUE;
-       }
-
-       if (opt_rev_graph && commit->graph_size) {
-               size_t graph_size = view->width - col;
-               size_t i;
+       if (opt_date && draw_date(view, &commit->time))
+               return TRUE;
 
-               if (type != LINE_CURSOR)
-                       wattrset(view->win, get_line_attr(LINE_MAIN_REVGRAPH));
-               wmove(view->win, lineno, col);
-               if (graph_size > commit->graph_size)
-                       graph_size = commit->graph_size;
-               /* Using waddch() instead of waddnstr() ensures that
-                * they'll be rendered correctly for the cursor line. */
-               for (i = 0; i < graph_size; i++)
-                       waddch(view->win, commit->graph[i]);
-
-               col += commit->graph_size + 1;
-               if (col >= view->width)
-                       return TRUE;
-               waddch(view->win, ' ');
-       }
-       if (type != LINE_CURSOR)
-               wattrset(view->win, A_NORMAL);
+       if (opt_author && draw_author(view, commit->author))
+               return TRUE;
 
-       wmove(view->win, lineno, col);
+       if (opt_rev_graph && commit->graph_size &&
+           draw_graphic(view, LINE_MAIN_REVGRAPH, commit->graph, commit->graph_size))
+               return TRUE;
 
        if (opt_show_refs && commit->refs) {
                size_t i = 0;
 
                do {
-                       if (type == LINE_CURSOR)
-                               ;
+                       enum line_type type;
+
+                       if (commit->refs[i]->head)
+                               type = LINE_MAIN_HEAD;
                        else if (commit->refs[i]->ltag)
-                               wattrset(view->win, get_line_attr(LINE_MAIN_LOCAL_TAG));
+                               type = LINE_MAIN_LOCAL_TAG;
                        else if (commit->refs[i]->tag)
-                               wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
+                               type = LINE_MAIN_TAG;
+                       else if (commit->refs[i]->tracked)
+                               type = LINE_MAIN_TRACKED;
                        else if (commit->refs[i]->remote)
-                               wattrset(view->win, get_line_attr(LINE_MAIN_REMOTE));
+                               type = LINE_MAIN_REMOTE;
                        else
-                               wattrset(view->win, get_line_attr(LINE_MAIN_REF));
-
-                       col += draw_text(view, "[", view->width - col, TRUE, tilde_attr);
-                       col += draw_text(view, commit->refs[i]->name, view->width - col,
-                                        TRUE, tilde_attr);
-                       col += draw_text(view, "]", view->width - col, TRUE, tilde_attr);
-                       if (type != LINE_CURSOR)
-                               wattrset(view->win, A_NORMAL);
-                       col += draw_text(view, " ", view->width - col, TRUE, tilde_attr);
-                       if (col >= view->width)
+                               type = LINE_MAIN_REF;
+
+                       if (draw_text(view, type, "[", TRUE) ||
+                           draw_text(view, type, commit->refs[i]->name, TRUE) ||
+                           draw_text(view, type, "]", TRUE))
+                               return TRUE;
+
+                       if (draw_text(view, LINE_DEFAULT, " ", TRUE))
                                return TRUE;
                } while (commit->refs[i++]->next);
        }
 
-       if (type != LINE_CURSOR)
-               wattrset(view->win, get_line_attr(type));
-
-       draw_text(view, commit->title, view->width - col, TRUE, tilde_attr);
+       draw_text(view, LINE_DEFAULT, commit->title, TRUE);
        return TRUE;
 }
 
@@ -4329,7 +5800,23 @@ main_read(struct view *view, char *line)
        struct commit *commit;
 
        if (!line) {
-               update_rev_graph(graph);
+               int i;
+
+               if (!view->lines && !view->parent)
+                       die("No revisions match the given arguments.");
+               if (view->lines > 0) {
+                       commit = view->line[view->lines - 1].data;
+                       view->line[view->lines - 1].dirty = 1;
+                       if (!*commit->author) {
+                               view->lines--;
+                               free(commit);
+                               graph->commit = NULL;
+                       }
+               }
+               update_rev_graph(view, graph);
+
+               for (i = 0; i < ARRAY_SIZE(graph_stacks); i++)
+                       clear_rev_graph(&graph_stacks[i]);
                return TRUE;
        }
 
@@ -4370,55 +5857,13 @@ 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, sizeof(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])
@@ -4439,6 +5884,7 @@ main_read(struct view *view, char *line)
                 * shortened titles, etc. */
 
                string_ncopy(commit->title, line, strlen(line));
+               view->line[view->lines - 1].dirty = 1;
        }
 
        return TRUE;
@@ -4449,19 +5895,42 @@ main_request(struct view *view, enum request request, struct line *line)
 {
        enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
 
-       if (request == REQ_ENTER)
+       switch (request) {
+       case REQ_ENTER:
                open_view(view, REQ_VIEW_DIFF, flags);
-       else
+               break;
+       case REQ_REFRESH:
+               load_refs();
+               open_view(view, REQ_VIEW_MAIN, OPEN_REFRESH);
+               break;
+       default:
                return request;
+       }
 
        return REQ_NONE;
 }
 
+static bool
+grep_refs(struct ref **refs, regex_t *regex)
+{
+       regmatch_t pmatch;
+       size_t i = 0;
+
+       if (!refs)
+               return FALSE;
+       do {
+               if (regexec(regex, refs[i]->name, 1, &pmatch, 0) != REG_NOMATCH)
+                       return TRUE;
+       } while (refs[i++]->next);
+
+       return FALSE;
+}
+
 static bool
 main_grep(struct view *view, struct line *line)
 {
        struct commit *commit = line->data;
-       enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
+       enum { S_TITLE, S_AUTHOR, S_DATE, S_REFS, S_END } state;
        char buf[DATE_COLS + 1];
        regmatch_t pmatch;
 
@@ -4470,13 +5939,24 @@ main_grep(struct view *view, struct line *line)
 
                switch (state) {
                case S_TITLE:   text = commit->title;   break;
-               case S_AUTHOR:  text = commit->author;  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;
                }
@@ -4499,6 +5979,7 @@ main_select(struct view *view, struct line *line)
 
 static struct view_ops main_ops = {
        "commit",
+       main_argv,
        NULL,
        main_read,
        main_draw,
@@ -4613,13 +6094,14 @@ 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, size_t max_width, int *trimmed, bool reserve)
+utf8_length(const char *string, int *width, size_t max_width, int *trimmed, bool reserve)
 {
        const char *start = string;
        const char *end = strchr(string, '\0');
        unsigned char last_bytes = 0;
-       size_t width = 0;
+       size_t last_ucwidth = 0;
 
+       *width = 0;
        *trimmed = 0;
 
        while (string < end) {
@@ -4640,17 +6122,20 @@ utf8_length(const char *string, size_t max_width, int *trimmed, bool reserve)
                        break;
 
                ucwidth = unicode_width(unicode);
-               width  += ucwidth;
-               if (width > max_width) {
+               *width  += ucwidth;
+               if (*width > max_width) {
                        *trimmed = 1;
-                       if (reserve && width - ucwidth == max_width) {
+                       *width -= ucwidth;
+                       if (reserve && *width == max_width) {
                                string -= last_bytes;
+                               *width -= last_ucwidth;
                        }
                        break;
                }
 
                string  += bytes;
                last_bytes = bytes;
+               last_ucwidth = ucwidth;
        }
 
        return string - start;
@@ -4664,10 +6149,17 @@ utf8_length(const char *string, size_t max_width, int *trimmed, bool reserve)
 /* 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
@@ -4699,6 +6191,8 @@ 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;
@@ -4706,13 +6200,12 @@ 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. */
@@ -4729,18 +6222,19 @@ set_nonblocking_input(bool loading)
 static void
 init_display(void)
 {
+       const char *term;
        int x, y;
 
        /* Initialize the curses library */
        if (isatty(STDIN_FILENO)) {
                cursed = !!initscr();
+               opt_tty = stdin;
        } else {
                /* Leave stdin and stdout alone when acting as a pager. */
-               FILE *io = fopen("/dev/tty", "r+");
-
-               if (!io)
+               opt_tty = fopen("/dev/tty", "r+");
+               if (!opt_tty)
                        die("Failed to open /dev/tty");
-               cursed = !!newterm(NULL, io, io);
+               cursed = !!newterm(NULL, opt_tty, opt_tty);
        }
 
        if (!cursed)
@@ -4749,7 +6243,7 @@ init_display(void)
        nonl();         /* Tell curses not to do NL->CR/NL on output */
        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();
@@ -4762,50 +6256,122 @@ init_display(void)
        /* Enable keyboard mapping */
        keypad(status_win, TRUE);
        wbkgdset(status_win, get_line_attr(LINE_STATUS));
+
+       TABSIZE = opt_tab_size;
+       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 char *
-read_prompt(const char *prompt)
+static int
+get_input(int prompt_position)
 {
-       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;
+       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;
+               }
+
+               /* 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;
 
-               input_mode = FALSE;
+       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);
 
-               /* Refresh, accept single keystroke of input */
-               key = wgetch(status_win);
+               key = get_input(pos + 1);
                switch (key) {
                case KEY_RETURN:
                case KEY_ENTER:
                case '\n':
-                       status = pos ? STOP : CANCEL;
+                       status = pos ? INPUT_STOP : INPUT_CANCEL;
                        break;
 
                case KEY_BACKSPACE:
                        if (pos > 0)
-                               pos--;
+                               buf[--pos] = 0;
                        else
-                               status = CANCEL;
+                               status = INPUT_CANCEL;
                        break;
 
                case KEY_ESC:
-                       status = CANCEL;
-                       break;
-
-               case ERR:
+                       status = INPUT_CANCEL;
                        break;
 
                default:
@@ -4814,7 +6380,8 @@ read_prompt(const char *prompt)
                                return NULL;
                        }
 
-                       if (isprint(key))
+                       status = handler(data, buf, key);
+                       if (status == INPUT_OK)
                                buf[pos++] = (char) key;
                }
        }
@@ -4823,7 +6390,7 @@ read_prompt(const char *prompt)
        status_empty = FALSE;
        report("");
 
-       if (status == CANCEL)
+       if (status == INPUT_CANCEL)
                return NULL;
 
        buf[pos++] = 0;
@@ -4831,8 +6398,41 @@ read_prompt(const char *prompt)
        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)
+{
+       return prompt_input(prompt, read_prompt_handler, NULL);
+}
+
 /*
- * Repository references
+ * Repository properties
  */
 
 static struct ref *refs = NULL;
@@ -4844,8 +6444,27 @@ static struct ref ***id_refs = NULL;
 static size_t id_refs_alloc = 0;
 static size_t id_refs_size = 0;
 
+static int
+compare_refs(const void *ref1_, const void *ref2_)
+{
+       const struct ref *ref1 = *(const struct ref **)ref1_;
+       const struct ref *ref2 = *(const struct ref **)ref2_;
+
+       if (ref1->tag != ref2->tag)
+               return ref2->tag - ref1->tag;
+       if (ref1->ltag != ref2->ltag)
+               return ref2->ltag - ref2->ltag;
+       if (ref1->head != ref2->head)
+               return ref2->head - ref1->head;
+       if (ref1->tracked != ref2->tracked)
+               return ref2->tracked - ref1->tracked;
+       if (ref1->remote != ref2->remote)
+               return ref2->remote - ref1->remote;
+       return strcmp(ref1->name, ref2->name);
+}
+
 static struct ref **
-get_refs(char *id)
+get_refs(const char *id)
 {
        struct ref ***tmp_id_refs;
        struct ref **ref_list = NULL;
@@ -4879,19 +6498,20 @@ get_refs(char *id)
                }
 
                ref_list = tmp;
-               if (ref_list_size > 0)
-                       ref_list[ref_list_size - 1]->next = 1;
                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 = 0;
+               ref_list[ref_list_size]->next = 1;
+
                ref_list_size++;
        }
 
-       if (ref_list)
+       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;
+       }
 
        return ref_list;
 }
@@ -4903,10 +6523,12 @@ read_ref(char *id, size_t idlen, char *name, size_t namelen)
        bool tag = FALSE;
        bool ltag = FALSE;
        bool remote = FALSE;
+       bool tracked = FALSE;
        bool check_replace = FALSE;
+       bool head = FALSE;
 
-       if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
-               if (!strcmp(name + namelen - 3, "^{}")) {
+       if (!prefixcmp(name, "refs/tags/")) {
+               if (!suffixcmp(name, namelen, "^{}")) {
                        namelen -= 3;
                        name[namelen] = 0;
                        if (refs_size > 0 && refs[refs_size - 1].ltag == TRUE)
@@ -4919,23 +6541,26 @@ read_ref(char *id, size_t idlen, char *name, size_t namelen)
                namelen -= STRING_SIZE("refs/tags/");
                name    += STRING_SIZE("refs/tags/");
 
-       } else if (!strncmp(name, "refs/remotes/", STRING_SIZE("refs/remotes/"))) {
+       } else if (!prefixcmp(name, "refs/remotes/")) {
                remote = TRUE;
                namelen -= STRING_SIZE("refs/remotes/");
                name    += STRING_SIZE("refs/remotes/");
+               tracked  = !strcmp(opt_remote, name);
 
-       } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
+       } else if (!prefixcmp(name, "refs/heads/")) {
                namelen -= STRING_SIZE("refs/heads/");
                name    += STRING_SIZE("refs/heads/");
+               head     = !strncmp(opt_head, name, namelen);
 
        } else if (!strcmp(name, "HEAD")) {
+               string_ncopy(opt_head_rev, id, idlen);
                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 beofre the commit id
+                * 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);
@@ -4953,9 +6578,11 @@ read_ref(char *id, size_t idlen, char *name, size_t namelen)
 
        strncpy(ref->name, name, namelen);
        ref->name[namelen] = 0;
+       ref->head = head;
        ref->tag = tag;
        ref->ltag = ltag;
        ref->remote = remote;
+       ref->tracked = tracked;
        string_copy_rev(ref->id, id);
 
        return OK;
@@ -4964,10 +6591,25 @@ 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;
+       static const char *ls_remote_argv[SIZEOF_ARG] = {
+               "git", "ls-remote", ".", NULL
+       };
+       static bool init = FALSE;
+
+       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]);
 
-       return read_properties(popen(cmd, "r"), "\t", read_ref);
+       return run_io_load(ls_remote_argv, "\t", read_ref);
 }
 
 static int
@@ -4979,14 +6621,37 @@ read_repo_config_option(char *name, size_t namelen, char *value, size_t valuelen
        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);
+
+       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);
+
+               if (!prefixcmp(value, "refs/heads/")) {
+                       value += STRING_SIZE("refs/heads/");
+                       valuelen -= STRING_SIZE("refs/heads/");
+               }
+
+               if (!string_format_from(opt_remote, &from, "/%s", value))
+                       opt_remote[0] = 0;
+       }
+
        return OK;
 }
 
 static int
-load_repo_config(void)
+load_git_config(void)
 {
-       return read_properties(popen(GIT_CONFIG " --list", "r"),
-                              "=", read_repo_config_option);
+       const char *config_list_argv[] = { "git", GIT_CONFIG, "--list", NULL };
+
+       return run_io_load(config_list_argv, "=", read_repo_config_option);
 }
 
 static int
@@ -5003,60 +6668,37 @@ 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 {
+       } else if (*name == '.') {
                string_ncopy(opt_cdup, name, namelen);
+
+       } else {
+               string_ncopy(opt_prefix, name, namelen);
        }
 
        return OK;
 }
 
-/* XXX: The line outputted by "--show-cdup" can be empty so the option
- * must be the last one! */
 static int
 load_repo_info(void)
 {
-       return read_properties(popen("git rev-parse --git-dir --is-inside-work-tree --show-cdup 2>/dev/null", "r"),
-                              "=", read_repo_info);
-}
-
-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);
+       const char *head_argv[] = {
+               "git", "symbolic-ref", "HEAD", NULL
+       };
+       const char *rev_parse_argv[] = {
+               "git", "rev-parse", "--git-dir", "--is-inside-work-tree",
+                       "--show-cdup", "--show-prefix", NULL
+       };
 
-               if (name[namelen]) {
-                       name[namelen] = 0;
-                       value = chomp_string(name + namelen + 1);
-                       valuelen = strlen(value);
+       if (run_io_buf(head_argv, opt_head, sizeof(opt_head))) {
+               chomp_string(opt_head);
+               if (!prefixcmp(opt_head, "refs/heads/")) {
+                       char *offset = opt_head + STRING_SIZE("refs/heads/");
 
-               } else {
-                       value = "";
-                       valuelen = 0;
+                       memmove(opt_head, offset, strlen(offset) + 1);
                }
-
-               state = read_property(name, namelen, value, valuelen);
        }
 
-       if (state != ERR && ferror(pipe))
-               state = ERR;
-
-       pclose(pipe);
-
-       return state;
+       return run_io_load(rev_parse_argv, "=", read_repo_info);
 }
 
 
@@ -5102,8 +6744,9 @@ warn(const char *msg, ...)
 }
 
 int
-main(int argc, char *argv[])
+main(int argc, const char *argv[])
 {
+       const char **run_argv = NULL;
        struct view *view;
        enum request request;
        size_t i;
@@ -5122,16 +6765,15 @@ main(int argc, char *argv[])
        if (load_options() == ERR)
                die("Failed to load user config.");
 
-       /* Load the repo config file so options can be overwritten from
-        * the command line. */
-       if (load_repo_config() == ERR)
+       if (load_git_config() == ERR)
                die("Failed to load repo config.");
 
-       if (!parse_options(argc, argv))
+       request = parse_options(argc, argv, &run_argv);
+       if (request == REQ_NONE)
                return 0;
 
        /* Require a git repository unless when running in pager mode. */
-       if (!opt_git_dir[0])
+       if (!opt_git_dir[0] && request != REQ_VIEW_PAGER)
                die("Not a git repository");
 
        if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
@@ -5146,31 +6788,25 @@ main(int argc, char *argv[])
        if (load_refs() == ERR)
                die("Failed to load refs.");
 
-       for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
-               view->cmd_env = getenv(view->cmd_env);
-
-       request = opt_request;
+       foreach_view (view, i)
+               argv_from_env(view->ops->argv, view->cmd_env);
 
        init_display();
 
-       while (view_driver(display[current_view], request)) {
-               int key;
-               int i;
-
-               foreach_view (view, i)
-                       update_view(view);
-
-               /* Refresh, accept single keystroke of input */
-               key = wgetch(status_win);
+       if (request == REQ_VIEW_PAGER || run_argv) {
+               if (request == REQ_VIEW_PAGER)
+                       io_open(&VIEW(request)->io, "");
+               else if (!prepare_update(VIEW(request), run_argv, NULL, FORMAT_NONE))
+                       die("Failed to format arguments");
+               open_view(NULL, request, OPEN_PREPARED);
+               request = REQ_NONE;
+       }
 
-               /* wgetch() with nodelay() enabled returns ERR when there's no
-                * input. */
-               if (key == ERR) {
-                       request = REQ_NONE;
-                       continue;
-               }
+       while (view_driver(display[current_view], request)) {
+               int key = get_input(0);
 
-               request = get_keybinding(display[current_view]->keymap, key);
+               view = display[current_view];
+               request = get_keybinding(view->keymap, key);
 
                /* Some low-level request handling. This keeps access to
                 * status_win restricted. */
@@ -5179,13 +6815,23 @@ main(int argc, char *argv[])
                {
                        char *cmd = read_prompt(":");
 
-                       if (cmd && string_format(opt_cmd, "git %s", cmd)) {
-                               if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
-                                       opt_request = REQ_VIEW_DIFF;
+                       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 {
-                                       opt_request = REQ_VIEW_PAGER;
+                                       open_view(view, REQ_VIEW_PAGER, OPEN_PREPARED);
                                }
-                               break;
                        }
 
                        request = REQ_NONE;
@@ -5194,8 +6840,7 @@ main(int argc, char *argv[])
                case REQ_SEARCH:
                case REQ_SEARCH_BACK:
                {
-                       const char *prompt = request == REQ_SEARCH
-                                          ? "/" : "?";
+                       const char *prompt = request == REQ_SEARCH ? "/" : "?";
                        char *search = read_prompt(prompt);
 
                        if (search)
@@ -5204,19 +6849,6 @@ main(int argc, char *argv[])
                                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;
                }