1 /* Copyright (c) 2006 Jonas Fonseca <fonseca@diku.dk>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
14 #ifndef VERSION
15 #define VERSION "tig-0.4.git"
16 #endif
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
22 #include <assert.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
33 #include <curses.h>
35 #if __GNUC__ >= 3
36 #define __NORETURN __attribute__((__noreturn__))
37 #else
38 #define __NORETURN
39 #endif
41 static void __NORETURN die(const char *err, ...);
42 static void report(const char *msg, ...);
43 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
44 static void set_nonblocking_input(bool loading);
45 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
47 #define ABS(x) ((x) >= 0 ? (x) : -(x))
48 #define MIN(x, y) ((x) < (y) ? (x) : (y))
50 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
51 #define STRING_SIZE(x) (sizeof(x) - 1)
53 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
54 #define SIZEOF_CMD 1024 /* Size of command buffer. */
55 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
57 /* This color name can be used to refer to the default term colors. */
58 #define COLOR_DEFAULT (-1)
60 /* The format and size of the date column in the main view. */
61 #define DATE_FORMAT "%Y-%m-%d %H:%M"
62 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
64 #define AUTHOR_COLS 20
66 /* The default interval between line numbers. */
67 #define NUMBER_INTERVAL 1
69 #define TABSIZE 8
71 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
73 #define TIG_LS_REMOTE \
74 "git ls-remote . 2>/dev/null"
76 #define TIG_DIFF_CMD \
77 "git show --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
79 #define TIG_LOG_CMD \
80 "git log --cc --stat -n100 %s 2>/dev/null"
82 #define TIG_MAIN_CMD \
83 "git log --topo-order --pretty=raw %s 2>/dev/null"
85 /* XXX: Needs to be defined to the empty string. */
86 #define TIG_HELP_CMD ""
87 #define TIG_PAGER_CMD ""
89 /* Some ascii-shorthands fitted into the ncurses namespace. */
90 #define KEY_TAB '\t'
91 #define KEY_RETURN '\r'
92 #define KEY_ESC 27
95 struct ref {
96 char *name; /* Ref name; tag or head names are shortened. */
97 char id[41]; /* Commit SHA1 ID */
98 unsigned int tag:1; /* Is it a tag? */
99 unsigned int next:1; /* For ref lists: are there more refs? */
100 };
102 static struct ref **get_refs(char *id);
104 struct int_map {
105 const char *name;
106 int namelen;
107 int value;
108 };
110 static int
111 set_from_int_map(struct int_map *map, size_t map_size,
112 int *value, const char *name, int namelen)
113 {
115 int i;
117 for (i = 0; i < map_size; i++)
118 if (namelen == map[i].namelen &&
119 !strncasecmp(name, map[i].name, namelen)) {
120 *value = map[i].value;
121 return OK;
122 }
124 return ERR;
125 }
128 /*
129 * String helpers
130 */
132 static inline void
133 string_ncopy(char *dst, const char *src, int dstlen)
134 {
135 strncpy(dst, src, dstlen - 1);
136 dst[dstlen - 1] = 0;
138 }
140 /* Shorthand for safely copying into a fixed buffer. */
141 #define string_copy(dst, src) \
142 string_ncopy(dst, src, sizeof(dst))
144 static char *
145 chomp_string(char *name)
146 {
147 int namelen;
149 while (isspace(*name))
150 name++;
152 namelen = strlen(name) - 1;
153 while (namelen > 0 && isspace(name[namelen]))
154 name[namelen--] = 0;
156 return name;
157 }
159 static bool
160 string_nformat(char *buf, size_t bufsize, int *bufpos, const char *fmt, ...)
161 {
162 va_list args;
163 int pos = bufpos ? *bufpos : 0;
165 va_start(args, fmt);
166 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
167 va_end(args);
169 if (bufpos)
170 *bufpos = pos;
172 return pos >= bufsize ? FALSE : TRUE;
173 }
175 #define string_format(buf, fmt, args...) \
176 string_nformat(buf, sizeof(buf), NULL, fmt, args)
178 #define string_format_from(buf, from, fmt, args...) \
179 string_nformat(buf, sizeof(buf), from, fmt, args)
181 static int
182 string_enum_compare(const char *str1, const char *str2, int len)
183 {
184 size_t i;
186 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
188 /* Diff-Header == DIFF_HEADER */
189 for (i = 0; i < len; i++) {
190 if (toupper(str1[i]) == toupper(str2[i]))
191 continue;
193 if (string_enum_sep(str1[i]) &&
194 string_enum_sep(str2[i]))
195 continue;
197 return str1[i] - str2[i];
198 }
200 return 0;
201 }
203 /* Shell quoting
204 *
205 * NOTE: The following is a slightly modified copy of the git project's shell
206 * quoting routines found in the quote.c file.
207 *
208 * Help to copy the thing properly quoted for the shell safety. any single
209 * quote is replaced with '\'', any exclamation point is replaced with '\!',
210 * and the whole thing is enclosed in a
211 *
212 * E.g.
213 * original sq_quote result
214 * name ==> name ==> 'name'
215 * a b ==> a b ==> 'a b'
216 * a'b ==> a'\''b ==> 'a'\''b'
217 * a!b ==> a'\!'b ==> 'a'\!'b'
218 */
220 static size_t
221 sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src)
222 {
223 char c;
225 #define BUFPUT(x) do { if (bufsize < SIZEOF_CMD) buf[bufsize++] = (x); } while (0)
227 BUFPUT('\'');
228 while ((c = *src++)) {
229 if (c == '\'' || c == '!') {
230 BUFPUT('\'');
231 BUFPUT('\\');
232 BUFPUT(c);
233 BUFPUT('\'');
234 } else {
235 BUFPUT(c);
236 }
237 }
238 BUFPUT('\'');
240 return bufsize;
241 }
244 /*
245 * User requests
246 */
248 #define REQ_INFO \
249 /* XXX: Keep the view request first and in sync with views[]. */ \
250 REQ_GROUP("View switching") \
251 REQ_(VIEW_MAIN, "Show main view"), \
252 REQ_(VIEW_DIFF, "Show diff view"), \
253 REQ_(VIEW_LOG, "Show log view"), \
254 REQ_(VIEW_HELP, "Show help page"), \
255 REQ_(VIEW_PAGER, "Show pager view"), \
256 \
257 REQ_GROUP("View manipulation") \
258 REQ_(ENTER, "Enter current line and scroll"), \
259 REQ_(NEXT, "Move to next"), \
260 REQ_(PREVIOUS, "Move to previous"), \
261 REQ_(VIEW_NEXT, "Move focus to next view"), \
262 REQ_(VIEW_CLOSE, "Close the current view"), \
263 REQ_(QUIT, "Close all views and quit"), \
264 \
265 REQ_GROUP("Cursor navigation") \
266 REQ_(MOVE_UP, "Move cursor one line up"), \
267 REQ_(MOVE_DOWN, "Move cursor one line down"), \
268 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
269 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
270 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
271 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
272 \
273 REQ_GROUP("Scrolling") \
274 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
275 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
276 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
277 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
278 \
279 REQ_GROUP("Misc") \
280 REQ_(PROMPT, "Bring up the prompt"), \
281 REQ_(SCREEN_UPDATE, "Update the screen"), \
282 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
283 REQ_(SCREEN_RESIZE, "Resize the screen"), \
284 REQ_(SHOW_VERSION, "Show version information"), \
285 REQ_(STOP_LOADING, "Stop all loading views"), \
286 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
287 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
290 /* User action requests. */
291 enum request {
292 #define REQ_GROUP(help)
293 #define REQ_(req, help) REQ_##req
295 /* Offset all requests to avoid conflicts with ncurses getch values. */
296 REQ_OFFSET = KEY_MAX + 1,
297 REQ_INFO,
298 REQ_UNKNOWN,
300 #undef REQ_GROUP
301 #undef REQ_
302 };
304 struct request_info {
305 enum request request;
306 char *name;
307 int namelen;
308 char *help;
309 };
311 static struct request_info req_info[] = {
312 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
313 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
314 REQ_INFO
315 #undef REQ_GROUP
316 #undef REQ_
317 };
319 static enum request
320 get_request(const char *name)
321 {
322 int namelen = strlen(name);
323 int i;
325 for (i = 0; i < ARRAY_SIZE(req_info); i++)
326 if (req_info[i].namelen == namelen &&
327 !string_enum_compare(req_info[i].name, name, namelen))
328 return req_info[i].request;
330 return REQ_UNKNOWN;
331 }
334 /*
335 * Options
336 */
338 static const char usage[] =
339 VERSION " (" __DATE__ ")\n"
340 "\n"
341 "Usage: tig [options]\n"
342 " or: tig [options] [--] [git log options]\n"
343 " or: tig [options] log [git log options]\n"
344 " or: tig [options] diff [git diff options]\n"
345 " or: tig [options] show [git show options]\n"
346 " or: tig [options] < [git command output]\n"
347 "\n"
348 "Options:\n"
349 " -l Start up in log view\n"
350 " -d Start up in diff view\n"
351 " -n[I], --line-number[=I] Show line numbers with given interval\n"
352 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
353 " -- Mark end of tig options\n"
354 " -v, --version Show version and exit\n"
355 " -h, --help Show help message and exit\n";
357 /* Option and state variables. */
358 static bool opt_line_number = FALSE;
359 static bool opt_rev_graph = TRUE;
360 static int opt_num_interval = NUMBER_INTERVAL;
361 static int opt_tab_size = TABSIZE;
362 static enum request opt_request = REQ_VIEW_MAIN;
363 static char opt_cmd[SIZEOF_CMD] = "";
364 static char opt_encoding[20] = "";
365 static bool opt_utf8 = TRUE;
366 static FILE *opt_pipe = NULL;
368 enum option_type {
369 OPT_NONE,
370 OPT_INT,
371 };
373 static bool
374 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
375 {
376 va_list args;
377 char *value = "";
378 int *number;
380 if (opt[0] != '-')
381 return FALSE;
383 if (opt[1] == '-') {
384 int namelen = strlen(name);
386 opt += 2;
388 if (strncmp(opt, name, namelen))
389 return FALSE;
391 if (opt[namelen] == '=')
392 value = opt + namelen + 1;
394 } else {
395 if (!short_name || opt[1] != short_name)
396 return FALSE;
397 value = opt + 2;
398 }
400 va_start(args, type);
401 if (type == OPT_INT) {
402 number = va_arg(args, int *);
403 if (isdigit(*value))
404 *number = atoi(value);
405 }
406 va_end(args);
408 return TRUE;
409 }
411 /* Returns the index of log or diff command or -1 to exit. */
412 static bool
413 parse_options(int argc, char *argv[])
414 {
415 int i;
417 for (i = 1; i < argc; i++) {
418 char *opt = argv[i];
420 if (!strcmp(opt, "-l")) {
421 opt_request = REQ_VIEW_LOG;
422 continue;
423 }
425 if (!strcmp(opt, "-d")) {
426 opt_request = REQ_VIEW_DIFF;
427 continue;
428 }
430 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
431 opt_line_number = TRUE;
432 continue;
433 }
435 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
436 opt_tab_size = MIN(opt_tab_size, TABSIZE);
437 continue;
438 }
440 if (check_option(opt, 'v', "version", OPT_NONE)) {
441 printf("tig version %s\n", VERSION);
442 return FALSE;
443 }
445 if (check_option(opt, 'h', "help", OPT_NONE)) {
446 printf(usage);
447 return FALSE;
448 }
450 if (!strcmp(opt, "--")) {
451 i++;
452 break;
453 }
455 if (!strcmp(opt, "log") ||
456 !strcmp(opt, "diff") ||
457 !strcmp(opt, "show")) {
458 opt_request = opt[0] == 'l'
459 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
460 break;
461 }
463 if (opt[0] && opt[0] != '-')
464 break;
466 die("unknown option '%s'\n\n%s", opt, usage);
467 }
469 if (!isatty(STDIN_FILENO)) {
470 opt_request = REQ_VIEW_PAGER;
471 opt_pipe = stdin;
473 } else if (i < argc) {
474 size_t buf_size;
476 if (opt_request == REQ_VIEW_MAIN)
477 /* XXX: This is vulnerable to the user overriding
478 * options required for the main view parser. */
479 string_copy(opt_cmd, "git log --stat --pretty=raw");
480 else
481 string_copy(opt_cmd, "git");
482 buf_size = strlen(opt_cmd);
484 while (buf_size < sizeof(opt_cmd) && i < argc) {
485 opt_cmd[buf_size++] = ' ';
486 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
487 }
489 if (buf_size >= sizeof(opt_cmd))
490 die("command too long");
492 opt_cmd[buf_size] = 0;
494 }
496 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
497 opt_utf8 = FALSE;
499 return TRUE;
500 }
503 /*
504 * Line-oriented content detection.
505 */
507 #define LINE_INFO \
508 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
509 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
510 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
511 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
512 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
513 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
514 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
515 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
516 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
517 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
518 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
519 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
520 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
521 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
522 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
523 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
524 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
525 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
526 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
527 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
528 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
529 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
530 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
531 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
532 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
533 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
534 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
535 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
536 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
537 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
538 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
539 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
540 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
541 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
542 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
543 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
544 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
545 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
547 enum line_type {
548 #define LINE(type, line, fg, bg, attr) \
549 LINE_##type
550 LINE_INFO
551 #undef LINE
552 };
554 struct line_info {
555 const char *name; /* Option name. */
556 int namelen; /* Size of option name. */
557 const char *line; /* The start of line to match. */
558 int linelen; /* Size of string to match. */
559 int fg, bg, attr; /* Color and text attributes for the lines. */
560 };
562 static struct line_info line_info[] = {
563 #define LINE(type, line, fg, bg, attr) \
564 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
565 LINE_INFO
566 #undef LINE
567 };
569 static enum line_type
570 get_line_type(char *line)
571 {
572 int linelen = strlen(line);
573 enum line_type type;
575 for (type = 0; type < ARRAY_SIZE(line_info); type++)
576 /* Case insensitive search matches Signed-off-by lines better. */
577 if (linelen >= line_info[type].linelen &&
578 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
579 return type;
581 return LINE_DEFAULT;
582 }
584 static inline int
585 get_line_attr(enum line_type type)
586 {
587 assert(type < ARRAY_SIZE(line_info));
588 return COLOR_PAIR(type) | line_info[type].attr;
589 }
591 static struct line_info *
592 get_line_info(char *name, int namelen)
593 {
594 enum line_type type;
596 for (type = 0; type < ARRAY_SIZE(line_info); type++)
597 if (namelen == line_info[type].namelen &&
598 !string_enum_compare(line_info[type].name, name, namelen))
599 return &line_info[type];
601 return NULL;
602 }
604 static void
605 init_colors(void)
606 {
607 int default_bg = COLOR_BLACK;
608 int default_fg = COLOR_WHITE;
609 enum line_type type;
611 start_color();
613 if (use_default_colors() != ERR) {
614 default_bg = -1;
615 default_fg = -1;
616 }
618 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
619 struct line_info *info = &line_info[type];
620 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
621 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
623 init_pair(type, fg, bg);
624 }
625 }
627 struct line {
628 enum line_type type;
629 void *data; /* User data */
630 };
633 /*
634 * Keys
635 */
637 struct keybinding {
638 int alias;
639 enum request request;
640 struct keybinding *next;
641 };
643 static struct keybinding default_keybindings[] = {
644 /* View switching */
645 { 'm', REQ_VIEW_MAIN },
646 { 'd', REQ_VIEW_DIFF },
647 { 'l', REQ_VIEW_LOG },
648 { 'p', REQ_VIEW_PAGER },
649 { 'h', REQ_VIEW_HELP },
650 { '?', REQ_VIEW_HELP },
652 /* View manipulation */
653 { 'q', REQ_VIEW_CLOSE },
654 { KEY_TAB, REQ_VIEW_NEXT },
655 { KEY_RETURN, REQ_ENTER },
656 { KEY_UP, REQ_PREVIOUS },
657 { KEY_DOWN, REQ_NEXT },
659 /* Cursor navigation */
660 { 'k', REQ_MOVE_UP },
661 { 'j', REQ_MOVE_DOWN },
662 { KEY_HOME, REQ_MOVE_FIRST_LINE },
663 { KEY_END, REQ_MOVE_LAST_LINE },
664 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
665 { ' ', REQ_MOVE_PAGE_DOWN },
666 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
667 { 'b', REQ_MOVE_PAGE_UP },
668 { '-', REQ_MOVE_PAGE_UP },
670 /* Scrolling */
671 { KEY_IC, REQ_SCROLL_LINE_UP },
672 { KEY_DC, REQ_SCROLL_LINE_DOWN },
673 { 'w', REQ_SCROLL_PAGE_UP },
674 { 's', REQ_SCROLL_PAGE_DOWN },
676 /* Misc */
677 { 'Q', REQ_QUIT },
678 { 'z', REQ_STOP_LOADING },
679 { 'v', REQ_SHOW_VERSION },
680 { 'r', REQ_SCREEN_REDRAW },
681 { 'n', REQ_TOGGLE_LINENO },
682 { 'g', REQ_TOGGLE_REV_GRAPH},
683 { ':', REQ_PROMPT },
685 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
686 { ERR, REQ_SCREEN_UPDATE },
688 /* Use the ncurses SIGWINCH handler. */
689 { KEY_RESIZE, REQ_SCREEN_RESIZE },
690 };
692 #define KEYMAP_INFO \
693 KEYMAP_(GENERIC), \
694 KEYMAP_(MAIN), \
695 KEYMAP_(DIFF), \
696 KEYMAP_(LOG), \
697 KEYMAP_(PAGER), \
698 KEYMAP_(HELP) \
700 enum keymap {
701 #define KEYMAP_(name) KEYMAP_##name
702 KEYMAP_INFO
703 #undef KEYMAP_
704 };
706 static struct int_map keymap_table[] = {
707 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
708 KEYMAP_INFO
709 #undef KEYMAP_
710 };
712 #define set_keymap(map, name) \
713 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
715 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
717 static void
718 add_keybinding(enum keymap keymap, enum request request, int key)
719 {
720 struct keybinding *keybinding;
722 keybinding = calloc(1, sizeof(*keybinding));
723 if (!keybinding)
724 die("Failed to allocate keybinding");
726 keybinding->alias = key;
727 keybinding->request = request;
728 keybinding->next = keybindings[keymap];
729 keybindings[keymap] = keybinding;
730 }
732 /* Looks for a key binding first in the given map, then in the generic map, and
733 * lastly in the default keybindings. */
734 static enum request
735 get_keybinding(enum keymap keymap, int key)
736 {
737 struct keybinding *kbd;
738 int i;
740 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
741 if (kbd->alias == key)
742 return kbd->request;
744 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
745 if (kbd->alias == key)
746 return kbd->request;
748 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
749 if (default_keybindings[i].alias == key)
750 return default_keybindings[i].request;
752 return (enum request) key;
753 }
756 struct key {
757 char *name;
758 int value;
759 };
761 static struct key key_table[] = {
762 { "Enter", KEY_RETURN },
763 { "Space", ' ' },
764 { "Backspace", KEY_BACKSPACE },
765 { "Tab", KEY_TAB },
766 { "Escape", KEY_ESC },
767 { "Left", KEY_LEFT },
768 { "Right", KEY_RIGHT },
769 { "Up", KEY_UP },
770 { "Down", KEY_DOWN },
771 { "Insert", KEY_IC },
772 { "Delete", KEY_DC },
773 { "Hash", '#' },
774 { "Home", KEY_HOME },
775 { "End", KEY_END },
776 { "PageUp", KEY_PPAGE },
777 { "PageDown", KEY_NPAGE },
778 { "F1", KEY_F(1) },
779 { "F2", KEY_F(2) },
780 { "F3", KEY_F(3) },
781 { "F4", KEY_F(4) },
782 { "F5", KEY_F(5) },
783 { "F6", KEY_F(6) },
784 { "F7", KEY_F(7) },
785 { "F8", KEY_F(8) },
786 { "F9", KEY_F(9) },
787 { "F10", KEY_F(10) },
788 { "F11", KEY_F(11) },
789 { "F12", KEY_F(12) },
790 };
792 static int
793 get_key_value(const char *name)
794 {
795 int i;
797 for (i = 0; i < ARRAY_SIZE(key_table); i++)
798 if (!strcasecmp(key_table[i].name, name))
799 return key_table[i].value;
801 if (strlen(name) == 1 && isprint(*name))
802 return (int) *name;
804 return ERR;
805 }
807 static char *
808 get_key(enum request request)
809 {
810 static char buf[BUFSIZ];
811 static char key_char[] = "'X'";
812 int pos = 0;
813 char *sep = " ";
814 int i;
816 buf[pos] = 0;
818 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
819 struct keybinding *keybinding = &default_keybindings[i];
820 char *seq = NULL;
821 int key;
823 if (keybinding->request != request)
824 continue;
826 for (key = 0; key < ARRAY_SIZE(key_table); key++)
827 if (key_table[key].value == keybinding->alias)
828 seq = key_table[key].name;
830 if (seq == NULL &&
831 keybinding->alias < 127 &&
832 isprint(keybinding->alias)) {
833 key_char[1] = (char) keybinding->alias;
834 seq = key_char;
835 }
837 if (!seq)
838 seq = "'?'";
840 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
841 return "Too many keybindings!";
842 sep = ", ";
843 }
845 return buf;
846 }
849 /*
850 * User config file handling.
851 */
853 static struct int_map color_map[] = {
854 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
855 COLOR_MAP(DEFAULT),
856 COLOR_MAP(BLACK),
857 COLOR_MAP(BLUE),
858 COLOR_MAP(CYAN),
859 COLOR_MAP(GREEN),
860 COLOR_MAP(MAGENTA),
861 COLOR_MAP(RED),
862 COLOR_MAP(WHITE),
863 COLOR_MAP(YELLOW),
864 };
866 #define set_color(color, name) \
867 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
869 static struct int_map attr_map[] = {
870 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
871 ATTR_MAP(NORMAL),
872 ATTR_MAP(BLINK),
873 ATTR_MAP(BOLD),
874 ATTR_MAP(DIM),
875 ATTR_MAP(REVERSE),
876 ATTR_MAP(STANDOUT),
877 ATTR_MAP(UNDERLINE),
878 };
880 #define set_attribute(attr, name) \
881 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
883 static int config_lineno;
884 static bool config_errors;
885 static char *config_msg;
887 /* Wants: object fgcolor bgcolor [attr] */
888 static int
889 option_color_command(int argc, char *argv[])
890 {
891 struct line_info *info;
893 if (argc != 3 && argc != 4) {
894 config_msg = "Wrong number of arguments given to color command";
895 return ERR;
896 }
898 info = get_line_info(argv[0], strlen(argv[0]));
899 if (!info) {
900 config_msg = "Unknown color name";
901 return ERR;
902 }
904 if (set_color(&info->fg, argv[1]) == ERR ||
905 set_color(&info->bg, argv[2]) == ERR) {
906 config_msg = "Unknown color";
907 return ERR;
908 }
910 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
911 config_msg = "Unknown attribute";
912 return ERR;
913 }
915 return OK;
916 }
918 /* Wants: name = value */
919 static int
920 option_set_command(int argc, char *argv[])
921 {
922 if (argc != 3) {
923 config_msg = "Wrong number of arguments given to set command";
924 return ERR;
925 }
927 if (strcmp(argv[1], "=")) {
928 config_msg = "No value assigned";
929 return ERR;
930 }
932 if (!strcmp(argv[0], "show-rev-graph")) {
933 opt_rev_graph = (!strcmp(argv[2], "1") ||
934 !strcmp(argv[2], "true") ||
935 !strcmp(argv[2], "yes"));
936 return OK;
937 }
939 if (!strcmp(argv[0], "line-number-interval")) {
940 opt_num_interval = atoi(argv[2]);
941 return OK;
942 }
944 if (!strcmp(argv[0], "tab-size")) {
945 opt_tab_size = atoi(argv[2]);
946 return OK;
947 }
949 if (!strcmp(argv[0], "commit-encoding")) {
950 char *arg = argv[2];
951 int delimiter = *arg;
952 int i;
954 switch (delimiter) {
955 case '"':
956 case '\'':
957 for (arg++, i = 0; arg[i]; i++)
958 if (arg[i] == delimiter) {
959 arg[i] = 0;
960 break;
961 }
962 default:
963 string_copy(opt_encoding, arg);
964 return OK;
965 }
966 }
968 config_msg = "Unknown variable name";
969 return ERR;
970 }
972 /* Wants: mode request key */
973 static int
974 option_bind_command(int argc, char *argv[])
975 {
976 enum request request;
977 int keymap;
978 int key;
980 if (argc != 3) {
981 config_msg = "Wrong number of arguments given to bind command";
982 return ERR;
983 }
985 if (set_keymap(&keymap, argv[0]) == ERR) {
986 config_msg = "Unknown key map";
987 return ERR;
988 }
990 key = get_key_value(argv[1]);
991 if (key == ERR) {
992 config_msg = "Unknown key";
993 return ERR;
994 }
996 request = get_request(argv[2]);
997 if (request == REQ_UNKNOWN) {
998 config_msg = "Unknown request name";
999 return ERR;
1000 }
1002 add_keybinding(keymap, request, key);
1004 return OK;
1005 }
1007 static int
1008 set_option(char *opt, char *value)
1009 {
1010 char *argv[16];
1011 int valuelen;
1012 int argc = 0;
1014 /* Tokenize */
1015 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1016 argv[argc++] = value;
1018 value += valuelen;
1019 if (!*value)
1020 break;
1022 *value++ = 0;
1023 while (isspace(*value))
1024 value++;
1025 }
1027 if (!strcmp(opt, "color"))
1028 return option_color_command(argc, argv);
1030 if (!strcmp(opt, "set"))
1031 return option_set_command(argc, argv);
1033 if (!strcmp(opt, "bind"))
1034 return option_bind_command(argc, argv);
1036 config_msg = "Unknown option command";
1037 return ERR;
1038 }
1040 static int
1041 read_option(char *opt, int optlen, char *value, int valuelen)
1042 {
1043 int status = OK;
1045 config_lineno++;
1046 config_msg = "Internal error";
1048 /* Check for comment markers, since read_properties() will
1049 * only ensure opt and value are split at first " \t". */
1050 optlen = strcspn(opt, "#");
1051 if (optlen == 0)
1052 return OK;
1054 if (opt[optlen] != 0) {
1055 config_msg = "No option value";
1056 status = ERR;
1058 } else {
1059 /* Look for comment endings in the value. */
1060 int len = strcspn(value, "#");
1062 if (len < valuelen) {
1063 valuelen = len;
1064 value[valuelen] = 0;
1065 }
1067 status = set_option(opt, value);
1068 }
1070 if (status == ERR) {
1071 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1072 config_lineno, optlen, opt, config_msg);
1073 config_errors = TRUE;
1074 }
1076 /* Always keep going if errors are encountered. */
1077 return OK;
1078 }
1080 static int
1081 load_options(void)
1082 {
1083 char *home = getenv("HOME");
1084 char buf[1024];
1085 FILE *file;
1087 config_lineno = 0;
1088 config_errors = FALSE;
1090 if (!home || !string_format(buf, "%s/.tigrc", home))
1091 return ERR;
1093 /* It's ok that the file doesn't exist. */
1094 file = fopen(buf, "r");
1095 if (!file)
1096 return OK;
1098 if (read_properties(file, " \t", read_option) == ERR ||
1099 config_errors == TRUE)
1100 fprintf(stderr, "Errors while loading %s.\n", buf);
1102 return OK;
1103 }
1106 /*
1107 * The viewer
1108 */
1110 struct view;
1111 struct view_ops;
1113 /* The display array of active views and the index of the current view. */
1114 static struct view *display[2];
1115 static unsigned int current_view;
1117 #define foreach_view(view, i) \
1118 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1120 #define displayed_views() (display[1] != NULL ? 2 : 1)
1122 /* Current head and commit ID */
1123 static char ref_commit[SIZEOF_REF] = "HEAD";
1124 static char ref_head[SIZEOF_REF] = "HEAD";
1126 struct view {
1127 const char *name; /* View name */
1128 const char *cmd_fmt; /* Default command line format */
1129 const char *cmd_env; /* Command line set via environment */
1130 const char *id; /* Points to either of ref_{head,commit} */
1132 struct view_ops *ops; /* View operations */
1134 enum keymap keymap; /* What keymap does this view have */
1136 char cmd[SIZEOF_CMD]; /* Command buffer */
1137 char ref[SIZEOF_REF]; /* Hovered commit reference */
1138 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
1140 int height, width; /* The width and height of the main window */
1141 WINDOW *win; /* The main window */
1142 WINDOW *title; /* The title window living below the main window */
1144 /* Navigation */
1145 unsigned long offset; /* Offset of the window top */
1146 unsigned long lineno; /* Current line number */
1148 /* If non-NULL, points to the view that opened this view. If this view
1149 * is closed tig will switch back to the parent view. */
1150 struct view *parent;
1152 /* Buffering */
1153 unsigned long lines; /* Total number of lines */
1154 struct line *line; /* Line index */
1155 unsigned long line_size;/* Total number of allocated lines */
1156 unsigned int digits; /* Number of digits in the lines member. */
1158 /* Loading */
1159 FILE *pipe;
1160 time_t start_time;
1161 };
1163 struct view_ops {
1164 /* What type of content being displayed. Used in the title bar. */
1165 const char *type;
1166 /* Draw one line; @lineno must be < view->height. */
1167 bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1168 /* Read one line; updates view->line. */
1169 bool (*read)(struct view *view, char *data);
1170 /* Depending on view, change display based on current line. */
1171 bool (*enter)(struct view *view, struct line *line);
1172 };
1174 static struct view_ops pager_ops;
1175 static struct view_ops main_ops;
1177 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1178 { name, cmd, #env, ref, ops, map}
1180 #define VIEW_(id, name, ops, ref) \
1181 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1184 static struct view views[] = {
1185 VIEW_(MAIN, "main", &main_ops, ref_head),
1186 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1187 VIEW_(LOG, "log", &pager_ops, ref_head),
1188 VIEW_(HELP, "help", &pager_ops, "static"),
1189 VIEW_(PAGER, "pager", &pager_ops, "static"),
1190 };
1192 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1195 static bool
1196 draw_view_line(struct view *view, unsigned int lineno)
1197 {
1198 if (view->offset + lineno >= view->lines)
1199 return FALSE;
1201 return view->ops->draw(view, &view->line[view->offset + lineno], lineno);
1202 }
1204 static void
1205 redraw_view_from(struct view *view, int lineno)
1206 {
1207 assert(0 <= lineno && lineno < view->height);
1209 for (; lineno < view->height; lineno++) {
1210 if (!draw_view_line(view, lineno))
1211 break;
1212 }
1214 redrawwin(view->win);
1215 wrefresh(view->win);
1216 }
1218 static void
1219 redraw_view(struct view *view)
1220 {
1221 wclear(view->win);
1222 redraw_view_from(view, 0);
1223 }
1226 static void
1227 update_view_title(struct view *view)
1228 {
1229 if (view == display[current_view])
1230 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1231 else
1232 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1234 werase(view->title);
1235 wmove(view->title, 0, 0);
1237 if (*view->ref)
1238 wprintw(view->title, "[%s] %s", view->name, view->ref);
1239 else
1240 wprintw(view->title, "[%s]", view->name);
1242 if (view->lines || view->pipe) {
1243 unsigned int view_lines = view->offset + view->height;
1244 unsigned int lines = view->lines
1245 ? MIN(view_lines, view->lines) * 100 / view->lines
1246 : 0;
1248 wprintw(view->title, " - %s %d of %d (%d%%)",
1249 view->ops->type,
1250 view->lineno + 1,
1251 view->lines,
1252 lines);
1253 }
1255 if (view->pipe) {
1256 time_t secs = time(NULL) - view->start_time;
1258 /* Three git seconds are a long time ... */
1259 if (secs > 2)
1260 wprintw(view->title, " %lds", secs);
1261 }
1263 wmove(view->title, 0, view->width - 1);
1264 wrefresh(view->title);
1265 }
1267 static void
1268 resize_display(void)
1269 {
1270 int offset, i;
1271 struct view *base = display[0];
1272 struct view *view = display[1] ? display[1] : display[0];
1274 /* Setup window dimensions */
1276 getmaxyx(stdscr, base->height, base->width);
1278 /* Make room for the status window. */
1279 base->height -= 1;
1281 if (view != base) {
1282 /* Horizontal split. */
1283 view->width = base->width;
1284 view->height = SCALE_SPLIT_VIEW(base->height);
1285 base->height -= view->height;
1287 /* Make room for the title bar. */
1288 view->height -= 1;
1289 }
1291 /* Make room for the title bar. */
1292 base->height -= 1;
1294 offset = 0;
1296 foreach_view (view, i) {
1297 if (!view->win) {
1298 view->win = newwin(view->height, 0, offset, 0);
1299 if (!view->win)
1300 die("Failed to create %s view", view->name);
1302 scrollok(view->win, TRUE);
1304 view->title = newwin(1, 0, offset + view->height, 0);
1305 if (!view->title)
1306 die("Failed to create title window");
1308 } else {
1309 wresize(view->win, view->height, view->width);
1310 mvwin(view->win, offset, 0);
1311 mvwin(view->title, offset + view->height, 0);
1312 }
1314 offset += view->height + 1;
1315 }
1316 }
1318 static void
1319 redraw_display(void)
1320 {
1321 struct view *view;
1322 int i;
1324 foreach_view (view, i) {
1325 redraw_view(view);
1326 update_view_title(view);
1327 }
1328 }
1330 static void
1331 update_display_cursor(void)
1332 {
1333 struct view *view = display[current_view];
1335 /* Move the cursor to the right-most column of the cursor line.
1336 *
1337 * XXX: This could turn out to be a bit expensive, but it ensures that
1338 * the cursor does not jump around. */
1339 if (view->lines) {
1340 wmove(view->win, view->lineno - view->offset, view->width - 1);
1341 wrefresh(view->win);
1342 }
1343 }
1345 /*
1346 * Navigation
1347 */
1349 /* Scrolling backend */
1350 static void
1351 do_scroll_view(struct view *view, int lines, bool redraw)
1352 {
1353 /* The rendering expects the new offset. */
1354 view->offset += lines;
1356 assert(0 <= view->offset && view->offset < view->lines);
1357 assert(lines);
1359 /* Redraw the whole screen if scrolling is pointless. */
1360 if (view->height < ABS(lines)) {
1361 redraw_view(view);
1363 } else {
1364 int line = lines > 0 ? view->height - lines : 0;
1365 int end = line + ABS(lines);
1367 wscrl(view->win, lines);
1369 for (; line < end; line++) {
1370 if (!draw_view_line(view, line))
1371 break;
1372 }
1373 }
1375 /* Move current line into the view. */
1376 if (view->lineno < view->offset) {
1377 view->lineno = view->offset;
1378 draw_view_line(view, 0);
1380 } else if (view->lineno >= view->offset + view->height) {
1381 if (view->lineno == view->offset + view->height) {
1382 /* Clear the hidden line so it doesn't show if the view
1383 * is scrolled up. */
1384 wmove(view->win, view->height, 0);
1385 wclrtoeol(view->win);
1386 }
1387 view->lineno = view->offset + view->height - 1;
1388 draw_view_line(view, view->lineno - view->offset);
1389 }
1391 assert(view->offset <= view->lineno && view->lineno < view->lines);
1393 if (!redraw)
1394 return;
1396 redrawwin(view->win);
1397 wrefresh(view->win);
1398 report("");
1399 }
1401 /* Scroll frontend */
1402 static void
1403 scroll_view(struct view *view, enum request request)
1404 {
1405 int lines = 1;
1407 switch (request) {
1408 case REQ_SCROLL_PAGE_DOWN:
1409 lines = view->height;
1410 case REQ_SCROLL_LINE_DOWN:
1411 if (view->offset + lines > view->lines)
1412 lines = view->lines - view->offset;
1414 if (lines == 0 || view->offset + view->height >= view->lines) {
1415 report("Cannot scroll beyond the last line");
1416 return;
1417 }
1418 break;
1420 case REQ_SCROLL_PAGE_UP:
1421 lines = view->height;
1422 case REQ_SCROLL_LINE_UP:
1423 if (lines > view->offset)
1424 lines = view->offset;
1426 if (lines == 0) {
1427 report("Cannot scroll beyond the first line");
1428 return;
1429 }
1431 lines = -lines;
1432 break;
1434 default:
1435 die("request %d not handled in switch", request);
1436 }
1438 do_scroll_view(view, lines, TRUE);
1439 }
1441 /* Cursor moving */
1442 static void
1443 move_view(struct view *view, enum request request, bool redraw)
1444 {
1445 int steps;
1447 switch (request) {
1448 case REQ_MOVE_FIRST_LINE:
1449 steps = -view->lineno;
1450 break;
1452 case REQ_MOVE_LAST_LINE:
1453 steps = view->lines - view->lineno - 1;
1454 break;
1456 case REQ_MOVE_PAGE_UP:
1457 steps = view->height > view->lineno
1458 ? -view->lineno : -view->height;
1459 break;
1461 case REQ_MOVE_PAGE_DOWN:
1462 steps = view->lineno + view->height >= view->lines
1463 ? view->lines - view->lineno - 1 : view->height;
1464 break;
1466 case REQ_MOVE_UP:
1467 steps = -1;
1468 break;
1470 case REQ_MOVE_DOWN:
1471 steps = 1;
1472 break;
1474 default:
1475 die("request %d not handled in switch", request);
1476 }
1478 if (steps <= 0 && view->lineno == 0) {
1479 report("Cannot move beyond the first line");
1480 return;
1482 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1483 report("Cannot move beyond the last line");
1484 return;
1485 }
1487 /* Move the current line */
1488 view->lineno += steps;
1489 assert(0 <= view->lineno && view->lineno < view->lines);
1491 /* Repaint the old "current" line if we be scrolling */
1492 if (ABS(steps) < view->height) {
1493 int prev_lineno = view->lineno - steps - view->offset;
1495 wmove(view->win, prev_lineno, 0);
1496 wclrtoeol(view->win);
1497 draw_view_line(view, prev_lineno);
1498 }
1500 /* Check whether the view needs to be scrolled */
1501 if (view->lineno < view->offset ||
1502 view->lineno >= view->offset + view->height) {
1503 if (steps < 0 && -steps > view->offset) {
1504 steps = -view->offset;
1506 } else if (steps > 0) {
1507 if (view->lineno == view->lines - 1 &&
1508 view->lines > view->height) {
1509 steps = view->lines - view->offset - 1;
1510 if (steps >= view->height)
1511 steps -= view->height - 1;
1512 }
1513 }
1515 do_scroll_view(view, steps, redraw);
1516 return;
1517 }
1519 /* Draw the current line */
1520 draw_view_line(view, view->lineno - view->offset);
1522 if (!redraw)
1523 return;
1525 redrawwin(view->win);
1526 wrefresh(view->win);
1527 report("");
1528 }
1531 /*
1532 * Incremental updating
1533 */
1535 static void
1536 end_update(struct view *view)
1537 {
1538 if (!view->pipe)
1539 return;
1540 set_nonblocking_input(FALSE);
1541 if (view->pipe == stdin)
1542 fclose(view->pipe);
1543 else
1544 pclose(view->pipe);
1545 view->pipe = NULL;
1546 }
1548 static bool
1549 begin_update(struct view *view)
1550 {
1551 const char *id = view->id;
1553 if (view->pipe)
1554 end_update(view);
1556 if (opt_cmd[0]) {
1557 string_copy(view->cmd, opt_cmd);
1558 opt_cmd[0] = 0;
1559 /* When running random commands, the view ref could have become
1560 * invalid so clear it. */
1561 view->ref[0] = 0;
1562 } else {
1563 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1565 if (!string_format(view->cmd, format, id, id, id, id, id))
1566 return FALSE;
1567 }
1569 /* Special case for the pager view. */
1570 if (opt_pipe) {
1571 view->pipe = opt_pipe;
1572 opt_pipe = NULL;
1573 } else {
1574 view->pipe = popen(view->cmd, "r");
1575 }
1577 if (!view->pipe)
1578 return FALSE;
1580 set_nonblocking_input(TRUE);
1582 view->offset = 0;
1583 view->lines = 0;
1584 view->lineno = 0;
1585 string_copy(view->vid, id);
1587 if (view->line) {
1588 int i;
1590 for (i = 0; i < view->lines; i++)
1591 if (view->line[i].data)
1592 free(view->line[i].data);
1594 free(view->line);
1595 view->line = NULL;
1596 }
1598 view->start_time = time(NULL);
1600 return TRUE;
1601 }
1603 static struct line *
1604 realloc_lines(struct view *view, size_t line_size)
1605 {
1606 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1608 if (!tmp)
1609 return NULL;
1611 view->line = tmp;
1612 view->line_size = line_size;
1613 return view->line;
1614 }
1616 static bool
1617 update_view(struct view *view)
1618 {
1619 char buffer[BUFSIZ];
1620 char *line;
1621 /* The number of lines to read. If too low it will cause too much
1622 * redrawing (and possible flickering), if too high responsiveness
1623 * will suffer. */
1624 unsigned long lines = view->height;
1625 int redraw_from = -1;
1627 if (!view->pipe)
1628 return TRUE;
1630 /* Only redraw if lines are visible. */
1631 if (view->offset + view->height >= view->lines)
1632 redraw_from = view->lines - view->offset;
1634 if (!realloc_lines(view, view->lines + lines))
1635 goto alloc_error;
1637 while ((line = fgets(buffer, sizeof(buffer), view->pipe))) {
1638 int linelen = strlen(line);
1640 if (linelen)
1641 line[linelen - 1] = 0;
1643 if (!view->ops->read(view, line))
1644 goto alloc_error;
1646 if (lines-- == 1)
1647 break;
1648 }
1650 {
1651 int digits;
1653 lines = view->lines;
1654 for (digits = 0; lines; digits++)
1655 lines /= 10;
1657 /* Keep the displayed view in sync with line number scaling. */
1658 if (digits != view->digits) {
1659 view->digits = digits;
1660 redraw_from = 0;
1661 }
1662 }
1664 if (redraw_from >= 0) {
1665 /* If this is an incremental update, redraw the previous line
1666 * since for commits some members could have changed when
1667 * loading the main view. */
1668 if (redraw_from > 0)
1669 redraw_from--;
1671 /* Incrementally draw avoids flickering. */
1672 redraw_view_from(view, redraw_from);
1673 }
1675 /* Update the title _after_ the redraw so that if the redraw picks up a
1676 * commit reference in view->ref it'll be available here. */
1677 update_view_title(view);
1679 if (ferror(view->pipe)) {
1680 report("Failed to read: %s", strerror(errno));
1681 goto end;
1683 } else if (feof(view->pipe)) {
1684 report("");
1685 goto end;
1686 }
1688 return TRUE;
1690 alloc_error:
1691 report("Allocation failure");
1693 end:
1694 end_update(view);
1695 return FALSE;
1696 }
1699 /*
1700 * View opening
1701 */
1703 static void open_help_view(struct view *view)
1704 {
1705 char buf[BUFSIZ];
1706 int lines = ARRAY_SIZE(req_info) + 2;
1707 int i;
1709 if (view->lines > 0)
1710 return;
1712 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1713 if (!req_info[i].request)
1714 lines++;
1716 view->line = calloc(lines, sizeof(*view->line));
1717 if (!view->line) {
1718 report("Allocation failure");
1719 return;
1720 }
1722 view->ops->read(view, "Quick reference for tig keybindings:");
1724 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1725 char *key;
1727 if (!req_info[i].request) {
1728 view->ops->read(view, "");
1729 view->ops->read(view, req_info[i].help);
1730 continue;
1731 }
1733 key = get_key(req_info[i].request);
1734 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1735 continue;
1737 view->ops->read(view, buf);
1738 }
1739 }
1741 enum open_flags {
1742 OPEN_DEFAULT = 0, /* Use default view switching. */
1743 OPEN_SPLIT = 1, /* Split current view. */
1744 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1745 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1746 };
1748 static void
1749 open_view(struct view *prev, enum request request, enum open_flags flags)
1750 {
1751 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1752 bool split = !!(flags & OPEN_SPLIT);
1753 bool reload = !!(flags & OPEN_RELOAD);
1754 struct view *view = VIEW(request);
1755 int nviews = displayed_views();
1756 struct view *base_view = display[0];
1758 if (view == prev && nviews == 1 && !reload) {
1759 report("Already in %s view", view->name);
1760 return;
1761 }
1763 if (view == VIEW(REQ_VIEW_HELP)) {
1764 open_help_view(view);
1766 } else if ((reload || strcmp(view->vid, view->id)) &&
1767 !begin_update(view)) {
1768 report("Failed to load %s view", view->name);
1769 return;
1770 }
1772 if (split) {
1773 display[1] = view;
1774 if (!backgrounded)
1775 current_view = 1;
1776 } else {
1777 /* Maximize the current view. */
1778 memset(display, 0, sizeof(display));
1779 current_view = 0;
1780 display[current_view] = view;
1781 }
1783 /* Resize the view when switching between split- and full-screen,
1784 * or when switching between two different full-screen views. */
1785 if (nviews != displayed_views() ||
1786 (nviews == 1 && base_view != display[0]))
1787 resize_display();
1789 if (split && prev->lineno - prev->offset >= prev->height) {
1790 /* Take the title line into account. */
1791 int lines = prev->lineno - prev->offset - prev->height + 1;
1793 /* Scroll the view that was split if the current line is
1794 * outside the new limited view. */
1795 do_scroll_view(prev, lines, TRUE);
1796 }
1798 if (prev && view != prev) {
1799 if (split && !backgrounded) {
1800 /* "Blur" the previous view. */
1801 update_view_title(prev);
1802 }
1804 view->parent = prev;
1805 }
1807 if (view->pipe && view->lines == 0) {
1808 /* Clear the old view and let the incremental updating refill
1809 * the screen. */
1810 wclear(view->win);
1811 report("");
1812 } else {
1813 redraw_view(view);
1814 report("");
1815 }
1817 /* If the view is backgrounded the above calls to report()
1818 * won't redraw the view title. */
1819 if (backgrounded)
1820 update_view_title(view);
1821 }
1824 /*
1825 * User request switch noodle
1826 */
1828 static int
1829 view_driver(struct view *view, enum request request)
1830 {
1831 int i;
1833 switch (request) {
1834 case REQ_MOVE_UP:
1835 case REQ_MOVE_DOWN:
1836 case REQ_MOVE_PAGE_UP:
1837 case REQ_MOVE_PAGE_DOWN:
1838 case REQ_MOVE_FIRST_LINE:
1839 case REQ_MOVE_LAST_LINE:
1840 move_view(view, request, TRUE);
1841 break;
1843 case REQ_SCROLL_LINE_DOWN:
1844 case REQ_SCROLL_LINE_UP:
1845 case REQ_SCROLL_PAGE_DOWN:
1846 case REQ_SCROLL_PAGE_UP:
1847 scroll_view(view, request);
1848 break;
1850 case REQ_VIEW_MAIN:
1851 case REQ_VIEW_DIFF:
1852 case REQ_VIEW_LOG:
1853 case REQ_VIEW_HELP:
1854 case REQ_VIEW_PAGER:
1855 open_view(view, request, OPEN_DEFAULT);
1856 break;
1858 case REQ_NEXT:
1859 case REQ_PREVIOUS:
1860 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
1862 if (view == VIEW(REQ_VIEW_DIFF) &&
1863 view->parent == VIEW(REQ_VIEW_MAIN)) {
1864 bool redraw = display[1] == view;
1866 view = view->parent;
1867 move_view(view, request, redraw);
1868 if (redraw)
1869 update_view_title(view);
1870 } else {
1871 move_view(view, request, TRUE);
1872 break;
1873 }
1874 /* Fall-through */
1876 case REQ_ENTER:
1877 if (!view->lines) {
1878 report("Nothing to enter");
1879 break;
1880 }
1881 return view->ops->enter(view, &view->line[view->lineno]);
1883 case REQ_VIEW_NEXT:
1884 {
1885 int nviews = displayed_views();
1886 int next_view = (current_view + 1) % nviews;
1888 if (next_view == current_view) {
1889 report("Only one view is displayed");
1890 break;
1891 }
1893 current_view = next_view;
1894 /* Blur out the title of the previous view. */
1895 update_view_title(view);
1896 report("");
1897 break;
1898 }
1899 case REQ_TOGGLE_LINENO:
1900 opt_line_number = !opt_line_number;
1901 redraw_display();
1902 break;
1904 case REQ_TOGGLE_REV_GRAPH:
1905 opt_rev_graph = !opt_rev_graph;
1906 redraw_display();
1907 break;
1909 case REQ_PROMPT:
1910 /* Always reload^Wrerun commands from the prompt. */
1911 open_view(view, opt_request, OPEN_RELOAD);
1912 break;
1914 case REQ_STOP_LOADING:
1915 for (i = 0; i < ARRAY_SIZE(views); i++) {
1916 view = &views[i];
1917 if (view->pipe)
1918 report("Stopped loading the %s view", view->name),
1919 end_update(view);
1920 }
1921 break;
1923 case REQ_SHOW_VERSION:
1924 report("%s (built %s)", VERSION, __DATE__);
1925 return TRUE;
1927 case REQ_SCREEN_RESIZE:
1928 resize_display();
1929 /* Fall-through */
1930 case REQ_SCREEN_REDRAW:
1931 redraw_display();
1932 break;
1934 case REQ_SCREEN_UPDATE:
1935 doupdate();
1936 return TRUE;
1938 case REQ_VIEW_CLOSE:
1939 /* XXX: Mark closed views by letting view->parent point to the
1940 * view itself. Parents to closed view should never be
1941 * followed. */
1942 if (view->parent &&
1943 view->parent->parent != view->parent) {
1944 memset(display, 0, sizeof(display));
1945 current_view = 0;
1946 display[current_view] = view->parent;
1947 view->parent = view;
1948 resize_display();
1949 redraw_display();
1950 break;
1951 }
1952 /* Fall-through */
1953 case REQ_QUIT:
1954 return FALSE;
1956 default:
1957 /* An unknown key will show most commonly used commands. */
1958 report("Unknown key, press 'h' for help");
1959 return TRUE;
1960 }
1962 return TRUE;
1963 }
1966 /*
1967 * Pager backend
1968 */
1970 static bool
1971 pager_draw(struct view *view, struct line *line, unsigned int lineno)
1972 {
1973 char *text = line->data;
1974 enum line_type type = line->type;
1975 int textlen = strlen(text);
1976 int attr;
1978 wmove(view->win, lineno, 0);
1980 if (view->offset + lineno == view->lineno) {
1981 if (type == LINE_COMMIT) {
1982 string_copy(view->ref, text + 7);
1983 string_copy(ref_commit, view->ref);
1984 }
1986 type = LINE_CURSOR;
1987 wchgat(view->win, -1, 0, type, NULL);
1988 }
1990 attr = get_line_attr(type);
1991 wattrset(view->win, attr);
1993 if (opt_line_number || opt_tab_size < TABSIZE) {
1994 static char spaces[] = " ";
1995 int col_offset = 0, col = 0;
1997 if (opt_line_number) {
1998 unsigned long real_lineno = view->offset + lineno + 1;
2000 if (real_lineno == 1 ||
2001 (real_lineno % opt_num_interval) == 0) {
2002 wprintw(view->win, "%.*d", view->digits, real_lineno);
2004 } else {
2005 waddnstr(view->win, spaces,
2006 MIN(view->digits, STRING_SIZE(spaces)));
2007 }
2008 waddstr(view->win, ": ");
2009 col_offset = view->digits + 2;
2010 }
2012 while (text && col_offset + col < view->width) {
2013 int cols_max = view->width - col_offset - col;
2014 char *pos = text;
2015 int cols;
2017 if (*text == '\t') {
2018 text++;
2019 assert(sizeof(spaces) > TABSIZE);
2020 pos = spaces;
2021 cols = opt_tab_size - (col % opt_tab_size);
2023 } else {
2024 text = strchr(text, '\t');
2025 cols = line ? text - pos : strlen(pos);
2026 }
2028 waddnstr(view->win, pos, MIN(cols, cols_max));
2029 col += cols;
2030 }
2032 } else {
2033 int col = 0, pos = 0;
2035 for (; pos < textlen && col < view->width; pos++, col++)
2036 if (text[pos] == '\t')
2037 col += TABSIZE - (col % TABSIZE) - 1;
2039 waddnstr(view->win, text, pos);
2040 }
2042 return TRUE;
2043 }
2045 static void
2046 add_pager_refs(struct view *view, struct line *line)
2047 {
2048 char buf[1024];
2049 char *data = line->data;
2050 struct ref **refs;
2051 int bufpos = 0, refpos = 0;
2052 const char *sep = "Refs: ";
2054 assert(line->type == LINE_COMMIT);
2056 refs = get_refs(data + STRING_SIZE("commit "));
2057 if (!refs)
2058 return;
2060 do {
2061 struct ref *ref = refs[refpos];
2062 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2064 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2065 return;
2066 sep = ", ";
2067 } while (refs[refpos++]->next);
2069 if (!realloc_lines(view, view->line_size + 1))
2070 return;
2072 line = &view->line[view->lines];
2073 line->data = strdup(buf);
2074 if (!line->data)
2075 return;
2077 line->type = LINE_PP_REFS;
2078 view->lines++;
2079 }
2081 static bool
2082 pager_read(struct view *view, char *data)
2083 {
2084 struct line *line = &view->line[view->lines];
2086 line->data = strdup(data);
2087 if (!line->data)
2088 return FALSE;
2090 line->type = get_line_type(line->data);
2091 view->lines++;
2093 if (line->type == LINE_COMMIT &&
2094 (view == VIEW(REQ_VIEW_DIFF) ||
2095 view == VIEW(REQ_VIEW_LOG)))
2096 add_pager_refs(view, line);
2098 return TRUE;
2099 }
2101 static bool
2102 pager_enter(struct view *view, struct line *line)
2103 {
2104 int split = 0;
2106 if (line->type == LINE_COMMIT &&
2107 (view == VIEW(REQ_VIEW_LOG) ||
2108 view == VIEW(REQ_VIEW_PAGER))) {
2109 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2110 split = 1;
2111 }
2113 /* Always scroll the view even if it was split. That way
2114 * you can use Enter to scroll through the log view and
2115 * split open each commit diff. */
2116 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2118 /* FIXME: A minor workaround. Scrolling the view will call report("")
2119 * but if we are scrolling a non-current view this won't properly
2120 * update the view title. */
2121 if (split)
2122 update_view_title(view);
2124 return TRUE;
2125 }
2127 static struct view_ops pager_ops = {
2128 "line",
2129 pager_draw,
2130 pager_read,
2131 pager_enter,
2132 };
2135 /*
2136 * Main view backend
2137 */
2139 struct commit {
2140 char id[41]; /* SHA1 ID. */
2141 char title[75]; /* First line of the commit message. */
2142 char author[75]; /* Author of the commit. */
2143 struct tm time; /* Date from the author ident. */
2144 struct ref **refs; /* Repository references. */
2145 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2146 size_t graph_size; /* The width of the graph array. */
2147 };
2149 static bool
2150 main_draw(struct view *view, struct line *line, unsigned int lineno)
2151 {
2152 char buf[DATE_COLS + 1];
2153 struct commit *commit = line->data;
2154 enum line_type type;
2155 int col = 0;
2156 size_t timelen;
2157 size_t authorlen;
2158 int trimmed = 1;
2160 if (!*commit->author)
2161 return FALSE;
2163 wmove(view->win, lineno, col);
2165 if (view->offset + lineno == view->lineno) {
2166 string_copy(view->ref, commit->id);
2167 string_copy(ref_commit, view->ref);
2168 type = LINE_CURSOR;
2169 wattrset(view->win, get_line_attr(type));
2170 wchgat(view->win, -1, 0, type, NULL);
2172 } else {
2173 type = LINE_MAIN_COMMIT;
2174 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2175 }
2177 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2178 waddnstr(view->win, buf, timelen);
2179 waddstr(view->win, " ");
2181 col += DATE_COLS;
2182 wmove(view->win, lineno, col);
2183 if (type != LINE_CURSOR)
2184 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2186 if (opt_utf8) {
2187 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2188 } else {
2189 authorlen = strlen(commit->author);
2190 if (authorlen > AUTHOR_COLS - 2) {
2191 authorlen = AUTHOR_COLS - 2;
2192 trimmed = 1;
2193 }
2194 }
2196 if (trimmed) {
2197 waddnstr(view->win, commit->author, authorlen);
2198 if (type != LINE_CURSOR)
2199 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2200 waddch(view->win, '~');
2201 } else {
2202 waddstr(view->win, commit->author);
2203 }
2205 col += AUTHOR_COLS;
2206 if (type != LINE_CURSOR)
2207 wattrset(view->win, A_NORMAL);
2209 if (opt_rev_graph && commit->graph_size) {
2210 size_t i;
2212 wmove(view->win, lineno, col);
2213 /* Using waddch() instead of waddnstr() ensures that
2214 * they'll be rendered correctly for the cursor line. */
2215 for (i = 0; i < commit->graph_size; i++)
2216 waddch(view->win, commit->graph[i]);
2218 col += commit->graph_size + 1;
2219 }
2221 wmove(view->win, lineno, col);
2223 if (commit->refs) {
2224 size_t i = 0;
2226 do {
2227 if (type == LINE_CURSOR)
2228 ;
2229 else if (commit->refs[i]->tag)
2230 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2231 else
2232 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2233 waddstr(view->win, "[");
2234 waddstr(view->win, commit->refs[i]->name);
2235 waddstr(view->win, "]");
2236 if (type != LINE_CURSOR)
2237 wattrset(view->win, A_NORMAL);
2238 waddstr(view->win, " ");
2239 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2240 } while (commit->refs[i++]->next);
2241 }
2243 if (type != LINE_CURSOR)
2244 wattrset(view->win, get_line_attr(type));
2246 {
2247 int titlelen = strlen(commit->title);
2249 if (col + titlelen > view->width)
2250 titlelen = view->width - col;
2252 waddnstr(view->win, commit->title, titlelen);
2253 }
2255 return TRUE;
2256 }
2258 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2259 static bool
2260 main_read(struct view *view, char *line)
2261 {
2262 enum line_type type = get_line_type(line);
2263 struct commit *commit = view->lines
2264 ? view->line[view->lines - 1].data : NULL;
2266 switch (type) {
2267 case LINE_COMMIT:
2268 commit = calloc(1, sizeof(struct commit));
2269 if (!commit)
2270 return FALSE;
2272 line += STRING_SIZE("commit ");
2274 view->line[view->lines++].data = commit;
2275 string_copy(commit->id, line);
2276 commit->refs = get_refs(commit->id);
2277 commit->graph[commit->graph_size++] = ACS_LTEE;
2278 break;
2280 case LINE_AUTHOR:
2281 {
2282 char *ident = line + STRING_SIZE("author ");
2283 char *end = strchr(ident, '<');
2285 if (!commit)
2286 break;
2288 if (end) {
2289 char *email = end + 1;
2291 for (; end > ident && isspace(end[-1]); end--) ;
2293 if (end == ident && *email) {
2294 ident = email;
2295 end = strchr(ident, '>');
2296 for (; end > ident && isspace(end[-1]); end--) ;
2297 }
2298 *end = 0;
2299 }
2301 /* End is NULL or ident meaning there's no author. */
2302 if (end <= ident)
2303 ident = "Unknown";
2305 string_copy(commit->author, ident);
2307 /* Parse epoch and timezone */
2308 if (end) {
2309 char *secs = strchr(end + 1, '>');
2310 char *zone;
2311 time_t time;
2313 if (!secs || secs[1] != ' ')
2314 break;
2316 secs += 2;
2317 time = (time_t) atol(secs);
2318 zone = strchr(secs, ' ');
2319 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2320 long tz;
2322 zone++;
2323 tz = ('0' - zone[1]) * 60 * 60 * 10;
2324 tz += ('0' - zone[2]) * 60 * 60;
2325 tz += ('0' - zone[3]) * 60;
2326 tz += ('0' - zone[4]) * 60;
2328 if (zone[0] == '-')
2329 tz = -tz;
2331 time -= tz;
2332 }
2333 gmtime_r(&time, &commit->time);
2334 }
2335 break;
2336 }
2337 default:
2338 if (!commit)
2339 break;
2341 /* Fill in the commit title if it has not already been set. */
2342 if (commit->title[0])
2343 break;
2345 /* Require titles to start with a non-space character at the
2346 * offset used by git log. */
2347 /* FIXME: More gracefull handling of titles; append "..." to
2348 * shortened titles, etc. */
2349 if (strncmp(line, " ", 4) ||
2350 isspace(line[4]))
2351 break;
2353 string_copy(commit->title, line + 4);
2354 }
2356 return TRUE;
2357 }
2359 static bool
2360 main_enter(struct view *view, struct line *line)
2361 {
2362 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2364 open_view(view, REQ_VIEW_DIFF, flags);
2365 return TRUE;
2366 }
2368 static struct view_ops main_ops = {
2369 "commit",
2370 main_draw,
2371 main_read,
2372 main_enter,
2373 };
2376 /*
2377 * Unicode / UTF-8 handling
2378 *
2379 * NOTE: Much of the following code for dealing with unicode is derived from
2380 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2381 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2382 */
2384 /* I've (over)annotated a lot of code snippets because I am not entirely
2385 * confident that the approach taken by this small UTF-8 interface is correct.
2386 * --jonas */
2388 static inline int
2389 unicode_width(unsigned long c)
2390 {
2391 if (c >= 0x1100 &&
2392 (c <= 0x115f /* Hangul Jamo */
2393 || c == 0x2329
2394 || c == 0x232a
2395 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2396 /* CJK ... Yi */
2397 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2398 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2399 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2400 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2401 || (c >= 0xffe0 && c <= 0xffe6)
2402 || (c >= 0x20000 && c <= 0x2fffd)
2403 || (c >= 0x30000 && c <= 0x3fffd)))
2404 return 2;
2406 return 1;
2407 }
2409 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2410 * Illegal bytes are set one. */
2411 static const unsigned char utf8_bytes[256] = {
2412 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2413 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2414 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2415 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2416 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2417 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2418 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,
2419 3,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4, 5,5,5,5,6,6,1,1,
2420 };
2422 /* Decode UTF-8 multi-byte representation into a unicode character. */
2423 static inline unsigned long
2424 utf8_to_unicode(const char *string, size_t length)
2425 {
2426 unsigned long unicode;
2428 switch (length) {
2429 case 1:
2430 unicode = string[0];
2431 break;
2432 case 2:
2433 unicode = (string[0] & 0x1f) << 6;
2434 unicode += (string[1] & 0x3f);
2435 break;
2436 case 3:
2437 unicode = (string[0] & 0x0f) << 12;
2438 unicode += ((string[1] & 0x3f) << 6);
2439 unicode += (string[2] & 0x3f);
2440 break;
2441 case 4:
2442 unicode = (string[0] & 0x0f) << 18;
2443 unicode += ((string[1] & 0x3f) << 12);
2444 unicode += ((string[2] & 0x3f) << 6);
2445 unicode += (string[3] & 0x3f);
2446 break;
2447 case 5:
2448 unicode = (string[0] & 0x0f) << 24;
2449 unicode += ((string[1] & 0x3f) << 18);
2450 unicode += ((string[2] & 0x3f) << 12);
2451 unicode += ((string[3] & 0x3f) << 6);
2452 unicode += (string[4] & 0x3f);
2453 break;
2454 case 6:
2455 unicode = (string[0] & 0x01) << 30;
2456 unicode += ((string[1] & 0x3f) << 24);
2457 unicode += ((string[2] & 0x3f) << 18);
2458 unicode += ((string[3] & 0x3f) << 12);
2459 unicode += ((string[4] & 0x3f) << 6);
2460 unicode += (string[5] & 0x3f);
2461 break;
2462 default:
2463 die("Invalid unicode length");
2464 }
2466 /* Invalid characters could return the special 0xfffd value but NUL
2467 * should be just as good. */
2468 return unicode > 0xffff ? 0 : unicode;
2469 }
2471 /* Calculates how much of string can be shown within the given maximum width
2472 * and sets trimmed parameter to non-zero value if all of string could not be
2473 * shown.
2474 *
2475 * Additionally, adds to coloffset how many many columns to move to align with
2476 * the expected position. Takes into account how multi-byte and double-width
2477 * characters will effect the cursor position.
2478 *
2479 * Returns the number of bytes to output from string to satisfy max_width. */
2480 static size_t
2481 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
2482 {
2483 const char *start = string;
2484 const char *end = strchr(string, '\0');
2485 size_t mbwidth = 0;
2486 size_t width = 0;
2488 *trimmed = 0;
2490 while (string < end) {
2491 int c = *(unsigned char *) string;
2492 unsigned char bytes = utf8_bytes[c];
2493 size_t ucwidth;
2494 unsigned long unicode;
2496 if (string + bytes > end)
2497 break;
2499 /* Change representation to figure out whether
2500 * it is a single- or double-width character. */
2502 unicode = utf8_to_unicode(string, bytes);
2503 /* FIXME: Graceful handling of invalid unicode character. */
2504 if (!unicode)
2505 break;
2507 ucwidth = unicode_width(unicode);
2508 width += ucwidth;
2509 if (width > max_width) {
2510 *trimmed = 1;
2511 break;
2512 }
2514 /* The column offset collects the differences between the
2515 * number of bytes encoding a character and the number of
2516 * columns will be used for rendering said character.
2517 *
2518 * So if some character A is encoded in 2 bytes, but will be
2519 * represented on the screen using only 1 byte this will and up
2520 * adding 1 to the multi-byte column offset.
2521 *
2522 * Assumes that no double-width character can be encoding in
2523 * less than two bytes. */
2524 if (bytes > ucwidth)
2525 mbwidth += bytes - ucwidth;
2527 string += bytes;
2528 }
2530 *coloffset += mbwidth;
2532 return string - start;
2533 }
2536 /*
2537 * Status management
2538 */
2540 /* Whether or not the curses interface has been initialized. */
2541 static bool cursed = FALSE;
2543 /* The status window is used for polling keystrokes. */
2544 static WINDOW *status_win;
2546 /* Update status and title window. */
2547 static void
2548 report(const char *msg, ...)
2549 {
2550 static bool empty = TRUE;
2551 struct view *view = display[current_view];
2553 if (!empty || *msg) {
2554 va_list args;
2556 va_start(args, msg);
2558 werase(status_win);
2559 wmove(status_win, 0, 0);
2560 if (*msg) {
2561 vwprintw(status_win, msg, args);
2562 empty = FALSE;
2563 } else {
2564 empty = TRUE;
2565 }
2566 wrefresh(status_win);
2568 va_end(args);
2569 }
2571 update_view_title(view);
2572 update_display_cursor();
2573 }
2575 /* Controls when nodelay should be in effect when polling user input. */
2576 static void
2577 set_nonblocking_input(bool loading)
2578 {
2579 static unsigned int loading_views;
2581 if ((loading == FALSE && loading_views-- == 1) ||
2582 (loading == TRUE && loading_views++ == 0))
2583 nodelay(status_win, loading);
2584 }
2586 static void
2587 init_display(void)
2588 {
2589 int x, y;
2591 /* Initialize the curses library */
2592 if (isatty(STDIN_FILENO)) {
2593 cursed = !!initscr();
2594 } else {
2595 /* Leave stdin and stdout alone when acting as a pager. */
2596 FILE *io = fopen("/dev/tty", "r+");
2598 if (!io)
2599 die("Failed to open /dev/tty");
2600 cursed = !!newterm(NULL, io, io);
2601 }
2603 if (!cursed)
2604 die("Failed to initialize curses");
2606 nonl(); /* Tell curses not to do NL->CR/NL on output */
2607 cbreak(); /* Take input chars one at a time, no wait for \n */
2608 noecho(); /* Don't echo input */
2609 leaveok(stdscr, TRUE);
2611 if (has_colors())
2612 init_colors();
2614 getmaxyx(stdscr, y, x);
2615 status_win = newwin(1, 0, y - 1, 0);
2616 if (!status_win)
2617 die("Failed to create status window");
2619 /* Enable keyboard mapping */
2620 keypad(status_win, TRUE);
2621 wbkgdset(status_win, get_line_attr(LINE_STATUS));
2622 }
2624 static int
2625 read_prompt(void)
2626 {
2627 enum { READING, STOP, CANCEL } status = READING;
2628 char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
2629 int pos = 0;
2631 while (status == READING) {
2632 struct view *view;
2633 int i, key;
2635 foreach_view (view, i)
2636 update_view(view);
2638 report(":%.*s", pos, buf);
2639 /* Refresh, accept single keystroke of input */
2640 key = wgetch(status_win);
2641 switch (key) {
2642 case KEY_RETURN:
2643 case KEY_ENTER:
2644 case '\n':
2645 status = pos ? STOP : CANCEL;
2646 break;
2648 case KEY_BACKSPACE:
2649 if (pos > 0)
2650 pos--;
2651 else
2652 status = CANCEL;
2653 break;
2655 case KEY_ESC:
2656 status = CANCEL;
2657 break;
2659 case ERR:
2660 break;
2662 default:
2663 if (pos >= sizeof(buf)) {
2664 report("Input string too long");
2665 return ERR;
2666 }
2668 if (isprint(key))
2669 buf[pos++] = (char) key;
2670 }
2671 }
2673 if (status == CANCEL) {
2674 /* Clear the status window */
2675 report("");
2676 return ERR;
2677 }
2679 buf[pos++] = 0;
2680 if (!string_format(opt_cmd, "git %s", buf))
2681 return ERR;
2682 opt_request = REQ_VIEW_PAGER;
2684 return OK;
2685 }
2687 /*
2688 * Repository references
2689 */
2691 static struct ref *refs;
2692 static size_t refs_size;
2694 /* Id <-> ref store */
2695 static struct ref ***id_refs;
2696 static size_t id_refs_size;
2698 static struct ref **
2699 get_refs(char *id)
2700 {
2701 struct ref ***tmp_id_refs;
2702 struct ref **ref_list = NULL;
2703 size_t ref_list_size = 0;
2704 size_t i;
2706 for (i = 0; i < id_refs_size; i++)
2707 if (!strcmp(id, id_refs[i][0]->id))
2708 return id_refs[i];
2710 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
2711 if (!tmp_id_refs)
2712 return NULL;
2714 id_refs = tmp_id_refs;
2716 for (i = 0; i < refs_size; i++) {
2717 struct ref **tmp;
2719 if (strcmp(id, refs[i].id))
2720 continue;
2722 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
2723 if (!tmp) {
2724 if (ref_list)
2725 free(ref_list);
2726 return NULL;
2727 }
2729 ref_list = tmp;
2730 if (ref_list_size > 0)
2731 ref_list[ref_list_size - 1]->next = 1;
2732 ref_list[ref_list_size] = &refs[i];
2734 /* XXX: The properties of the commit chains ensures that we can
2735 * safely modify the shared ref. The repo references will
2736 * always be similar for the same id. */
2737 ref_list[ref_list_size]->next = 0;
2738 ref_list_size++;
2739 }
2741 if (ref_list)
2742 id_refs[id_refs_size++] = ref_list;
2744 return ref_list;
2745 }
2747 static int
2748 read_ref(char *id, int idlen, char *name, int namelen)
2749 {
2750 struct ref *ref;
2751 bool tag = FALSE;
2753 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
2754 /* Commits referenced by tags has "^{}" appended. */
2755 if (name[namelen - 1] != '}')
2756 return OK;
2758 while (namelen > 0 && name[namelen] != '^')
2759 namelen--;
2761 tag = TRUE;
2762 namelen -= STRING_SIZE("refs/tags/");
2763 name += STRING_SIZE("refs/tags/");
2765 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
2766 namelen -= STRING_SIZE("refs/heads/");
2767 name += STRING_SIZE("refs/heads/");
2769 } else if (!strcmp(name, "HEAD")) {
2770 return OK;
2771 }
2773 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
2774 if (!refs)
2775 return ERR;
2777 ref = &refs[refs_size++];
2778 ref->name = malloc(namelen + 1);
2779 if (!ref->name)
2780 return ERR;
2782 strncpy(ref->name, name, namelen);
2783 ref->name[namelen] = 0;
2784 ref->tag = tag;
2785 string_copy(ref->id, id);
2787 return OK;
2788 }
2790 static int
2791 load_refs(void)
2792 {
2793 const char *cmd_env = getenv("TIG_LS_REMOTE");
2794 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
2796 return read_properties(popen(cmd, "r"), "\t", read_ref);
2797 }
2799 static int
2800 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
2801 {
2802 if (!strcmp(name, "i18n.commitencoding"))
2803 string_copy(opt_encoding, value);
2805 return OK;
2806 }
2808 static int
2809 load_repo_config(void)
2810 {
2811 return read_properties(popen("git repo-config --list", "r"),
2812 "=", read_repo_config_option);
2813 }
2815 static int
2816 read_properties(FILE *pipe, const char *separators,
2817 int (*read_property)(char *, int, char *, int))
2818 {
2819 char buffer[BUFSIZ];
2820 char *name;
2821 int state = OK;
2823 if (!pipe)
2824 return ERR;
2826 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
2827 char *value;
2828 size_t namelen;
2829 size_t valuelen;
2831 name = chomp_string(name);
2832 namelen = strcspn(name, separators);
2834 if (name[namelen]) {
2835 name[namelen] = 0;
2836 value = chomp_string(name + namelen + 1);
2837 valuelen = strlen(value);
2839 } else {
2840 value = "";
2841 valuelen = 0;
2842 }
2844 state = read_property(name, namelen, value, valuelen);
2845 }
2847 if (state != ERR && ferror(pipe))
2848 state = ERR;
2850 pclose(pipe);
2852 return state;
2853 }
2856 /*
2857 * Main
2858 */
2860 static void __NORETURN
2861 quit(int sig)
2862 {
2863 /* XXX: Restore tty modes and let the OS cleanup the rest! */
2864 if (cursed)
2865 endwin();
2866 exit(0);
2867 }
2869 static void __NORETURN
2870 die(const char *err, ...)
2871 {
2872 va_list args;
2874 endwin();
2876 va_start(args, err);
2877 fputs("tig: ", stderr);
2878 vfprintf(stderr, err, args);
2879 fputs("\n", stderr);
2880 va_end(args);
2882 exit(1);
2883 }
2885 int
2886 main(int argc, char *argv[])
2887 {
2888 struct view *view;
2889 enum request request;
2890 size_t i;
2892 signal(SIGINT, quit);
2894 if (load_options() == ERR)
2895 die("Failed to load user config.");
2897 /* Load the repo config file so options can be overwritten from
2898 * the command line. */
2899 if (load_repo_config() == ERR)
2900 die("Failed to load repo config.");
2902 if (!parse_options(argc, argv))
2903 return 0;
2905 if (load_refs() == ERR)
2906 die("Failed to load refs.");
2908 /* Require a git repository unless when running in pager mode. */
2909 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
2910 die("Not a git repository");
2912 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
2913 view->cmd_env = getenv(view->cmd_env);
2915 request = opt_request;
2917 init_display();
2919 while (view_driver(display[current_view], request)) {
2920 int key;
2921 int i;
2923 foreach_view (view, i)
2924 update_view(view);
2926 /* Refresh, accept single keystroke of input */
2927 key = wgetch(status_win);
2929 request = get_keybinding(display[current_view]->keymap, key);
2931 /* Some low-level request handling. This keeps access to
2932 * status_win restricted. */
2933 switch (request) {
2934 case REQ_PROMPT:
2935 if (read_prompt() == ERR)
2936 request = REQ_SCREEN_UPDATE;
2937 break;
2939 case REQ_SCREEN_RESIZE:
2940 {
2941 int height, width;
2943 getmaxyx(stdscr, height, width);
2945 /* Resize the status view and let the view driver take
2946 * care of resizing the displayed views. */
2947 wresize(status_win, 1, width);
2948 mvwin(status_win, height - 1, 0);
2949 wrefresh(status_win);
2950 break;
2951 }
2952 default:
2953 break;
2954 }
2955 }
2957 quit(0);
2959 return 0;
2960 }