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[tig] / tig.c
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 */
13
14 #ifndef VERSION
15 #define VERSION "tig-0.3"
16 #endif
17
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
21
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>
32
33 #include <curses.h>
34
35 #if __GNUC__ >= 3
36 #define __NORETURN __attribute__((__noreturn__))
37 #else
38 #define __NORETURN
39 #endif
40
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);
46
47 #define ABS(x) ((x) >= 0 ? (x) : -(x))
48 #define MIN(x, y) ((x) < (y) ? (x) : (y))
49
50 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
51 #define STRING_SIZE(x) (sizeof(x) - 1)
52
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. */
56
57 /* This color name can be used to refer to the default term colors. */
58 #define COLOR_DEFAULT (-1)
59
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 ")
63
64 #define AUTHOR_COLS 20
65
66 /* The default interval between line numbers. */
67 #define NUMBER_INTERVAL 1
68
69 #define TABSIZE 8
70
71 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
72
73 #define TIG_LS_REMOTE \
74 "git ls-remote . 2>/dev/null"
75
76 #define TIG_DIFF_CMD \
77 "git show --patch-with-stat --find-copies-harder -B -C %s"
78
79 #define TIG_LOG_CMD \
80 "git log --cc --stat -n100 %s"
81
82 #define TIG_MAIN_CMD \
83 "git log --topo-order --stat --pretty=raw %s"
84
85 /* XXX: Needs to be defined to the empty string. */
86 #define TIG_HELP_CMD ""
87 #define TIG_PAGER_CMD ""
88
89 /* Some ascii-shorthands fitted into the ncurses namespace. */
90 #define KEY_TAB '\t'
91 #define KEY_RETURN '\r'
92 #define KEY_ESC 27
93
94
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 };
101
102 static struct ref **get_refs(char *id);
103
104 struct int_map {
105 const char *name;
106 int namelen;
107 int value;
108 };
109
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 {
114
115 int i;
116
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 }
123
124 return ERR;
125 }
126
127
128 /*
129 * String helpers
130 */
131
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;
137
138 }
139
140 /* Shorthand for safely copying into a fixed buffer. */
141 #define string_copy(dst, src) \
142 string_ncopy(dst, src, sizeof(dst))
143
144 static char *
145 chomp_string(char *name)
146 {
147 int namelen;
148
149 while (isspace(*name))
150 name++;
151
152 namelen = strlen(name) - 1;
153 while (namelen > 0 && isspace(name[namelen]))
154 name[namelen--] = 0;
155
156 return name;
157 }
158
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;
164
165 va_start(args, fmt);
166 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
167 va_end(args);
168
169 if (bufpos)
170 *bufpos = pos;
171
172 return pos >= bufsize ? FALSE : TRUE;
173 }
174
175 #define string_format(buf, fmt, args...) \
176 string_nformat(buf, sizeof(buf), NULL, fmt, args)
177
178 #define string_format_from(buf, from, fmt, args...) \
179 string_nformat(buf, sizeof(buf), from, fmt, args)
180
181 /* Shell quoting
182 *
183 * NOTE: The following is a slightly modified copy of the git project's shell
184 * quoting routines found in the quote.c file.
185 *
186 * Help to copy the thing properly quoted for the shell safety. any single
187 * quote is replaced with '\'', any exclamation point is replaced with '\!',
188 * and the whole thing is enclosed in a
189 *
190 * E.g.
191 * original sq_quote result
192 * name ==> name ==> 'name'
193 * a b ==> a b ==> 'a b'
194 * a'b ==> a'\''b ==> 'a'\''b'
195 * a!b ==> a'\!'b ==> 'a'\!'b'
196 */
197
198 static size_t
199 sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src)
200 {
201 char c;
202
203 #define BUFPUT(x) do { if (bufsize < SIZEOF_CMD) buf[bufsize++] = (x); } while (0)
204
205 BUFPUT('\'');
206 while ((c = *src++)) {
207 if (c == '\'' || c == '!') {
208 BUFPUT('\'');
209 BUFPUT('\\');
210 BUFPUT(c);
211 BUFPUT('\'');
212 } else {
213 BUFPUT(c);
214 }
215 }
216 BUFPUT('\'');
217
218 return bufsize;
219 }
220
221
222 /*
223 * User requests
224 */
225
226 #define REQ_INFO \
227 /* XXX: Keep the view request first and in sync with views[]. */ \
228 REQ_GROUP("View switching") \
229 REQ_(VIEW_MAIN, "Show main view"), \
230 REQ_(VIEW_DIFF, "Show diff view"), \
231 REQ_(VIEW_LOG, "Show log view"), \
232 REQ_(VIEW_HELP, "Show help page"), \
233 REQ_(VIEW_PAGER, "Show pager view"), \
234 \
235 REQ_GROUP("View manipulation") \
236 REQ_(ENTER, "Enter current line and scroll"), \
237 REQ_(NEXT, "Move to next"), \
238 REQ_(PREVIOUS, "Move to previous"), \
239 REQ_(VIEW_NEXT, "Move focus to next view"), \
240 REQ_(VIEW_CLOSE, "Close the current view"), \
241 REQ_(QUIT, "Close all views and quit"), \
242 \
243 REQ_GROUP("Cursor navigation") \
244 REQ_(MOVE_UP, "Move cursor one line up"), \
245 REQ_(MOVE_DOWN, "Move cursor one line down"), \
246 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
247 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
248 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
249 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
250 \
251 REQ_GROUP("Scrolling") \
252 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
253 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
254 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
255 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
256 \
257 REQ_GROUP("Misc") \
258 REQ_(PROMPT, "Bring up the prompt"), \
259 REQ_(SCREEN_UPDATE, "Update the screen"), \
260 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
261 REQ_(SCREEN_RESIZE, "Resize the screen"), \
262 REQ_(SHOW_VERSION, "Show version information"), \
263 REQ_(STOP_LOADING, "Stop all loading views"), \
264 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
265 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization"),
266
267
268 /* User action requests. */
269 enum request {
270 #define REQ_GROUP(help)
271 #define REQ_(req, help) REQ_##req
272
273 /* Offset all requests to avoid conflicts with ncurses getch values. */
274 REQ_OFFSET = KEY_MAX + 1,
275 REQ_INFO
276
277 #undef REQ_GROUP
278 #undef REQ_
279 };
280
281 struct request_info {
282 enum request request;
283 char *help;
284 };
285
286 static struct request_info req_info[] = {
287 #define REQ_GROUP(help) { 0, (help) },
288 #define REQ_(req, help) { REQ_##req, (help) }
289 REQ_INFO
290 #undef REQ_GROUP
291 #undef REQ_
292 };
293
294 /*
295 * Options
296 */
297
298 static const char usage[] =
299 VERSION " (" __DATE__ ")\n"
300 "\n"
301 "Usage: tig [options]\n"
302 " or: tig [options] [--] [git log options]\n"
303 " or: tig [options] log [git log options]\n"
304 " or: tig [options] diff [git diff options]\n"
305 " or: tig [options] show [git show options]\n"
306 " or: tig [options] < [git command output]\n"
307 "\n"
308 "Options:\n"
309 " -l Start up in log view\n"
310 " -d Start up in diff view\n"
311 " -n[I], --line-number[=I] Show line numbers with given interval\n"
312 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
313 " -- Mark end of tig options\n"
314 " -v, --version Show version and exit\n"
315 " -h, --help Show help message and exit\n";
316
317 /* Option and state variables. */
318 static bool opt_line_number = FALSE;
319 static bool opt_rev_graph = TRUE;
320 static int opt_num_interval = NUMBER_INTERVAL;
321 static int opt_tab_size = TABSIZE;
322 static enum request opt_request = REQ_VIEW_MAIN;
323 static char opt_cmd[SIZEOF_CMD] = "";
324 static char opt_encoding[20] = "";
325 static bool opt_utf8 = TRUE;
326 static FILE *opt_pipe = NULL;
327
328 enum option_type {
329 OPT_NONE,
330 OPT_INT,
331 };
332
333 static bool
334 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
335 {
336 va_list args;
337 char *value = "";
338 int *number;
339
340 if (opt[0] != '-')
341 return FALSE;
342
343 if (opt[1] == '-') {
344 int namelen = strlen(name);
345
346 opt += 2;
347
348 if (strncmp(opt, name, namelen))
349 return FALSE;
350
351 if (opt[namelen] == '=')
352 value = opt + namelen + 1;
353
354 } else {
355 if (!short_name || opt[1] != short_name)
356 return FALSE;
357 value = opt + 2;
358 }
359
360 va_start(args, type);
361 if (type == OPT_INT) {
362 number = va_arg(args, int *);
363 if (isdigit(*value))
364 *number = atoi(value);
365 }
366 va_end(args);
367
368 return TRUE;
369 }
370
371 /* Returns the index of log or diff command or -1 to exit. */
372 static bool
373 parse_options(int argc, char *argv[])
374 {
375 int i;
376
377 for (i = 1; i < argc; i++) {
378 char *opt = argv[i];
379
380 if (!strcmp(opt, "-l")) {
381 opt_request = REQ_VIEW_LOG;
382 continue;
383 }
384
385 if (!strcmp(opt, "-d")) {
386 opt_request = REQ_VIEW_DIFF;
387 continue;
388 }
389
390 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
391 opt_line_number = TRUE;
392 continue;
393 }
394
395 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
396 opt_tab_size = MIN(opt_tab_size, TABSIZE);
397 continue;
398 }
399
400 if (check_option(opt, 'v', "version", OPT_NONE)) {
401 printf("tig version %s\n", VERSION);
402 return FALSE;
403 }
404
405 if (check_option(opt, 'h', "help", OPT_NONE)) {
406 printf(usage);
407 return FALSE;
408 }
409
410 if (!strcmp(opt, "--")) {
411 i++;
412 break;
413 }
414
415 if (!strcmp(opt, "log") ||
416 !strcmp(opt, "diff") ||
417 !strcmp(opt, "show")) {
418 opt_request = opt[0] == 'l'
419 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
420 break;
421 }
422
423 if (opt[0] && opt[0] != '-')
424 break;
425
426 die("unknown option '%s'\n\n%s", opt, usage);
427 }
428
429 if (!isatty(STDIN_FILENO)) {
430 opt_request = REQ_VIEW_PAGER;
431 opt_pipe = stdin;
432
433 } else if (i < argc) {
434 size_t buf_size;
435
436 if (opt_request == REQ_VIEW_MAIN)
437 /* XXX: This is vulnerable to the user overriding
438 * options required for the main view parser. */
439 string_copy(opt_cmd, "git log --stat --pretty=raw");
440 else
441 string_copy(opt_cmd, "git");
442 buf_size = strlen(opt_cmd);
443
444 while (buf_size < sizeof(opt_cmd) && i < argc) {
445 opt_cmd[buf_size++] = ' ';
446 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
447 }
448
449 if (buf_size >= sizeof(opt_cmd))
450 die("command too long");
451
452 opt_cmd[buf_size] = 0;
453
454 }
455
456 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
457 opt_utf8 = FALSE;
458
459 return TRUE;
460 }
461
462
463 /*
464 * Line-oriented content detection.
465 */
466
467 #define LINE_INFO \
468 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
469 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
470 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
471 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
472 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
473 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
474 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
475 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
476 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
477 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
478 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
479 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
480 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
481 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
482 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
483 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
484 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
485 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
486 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
487 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
488 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
489 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
490 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
491 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
492 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
493 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
494 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
495 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
496 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
497 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
498 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
499 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
500 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
501 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
502 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
503 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
504 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
505 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
506
507 enum line_type {
508 #define LINE(type, line, fg, bg, attr) \
509 LINE_##type
510 LINE_INFO
511 #undef LINE
512 };
513
514 struct line_info {
515 const char *name; /* Option name. */
516 int namelen; /* Size of option name. */
517 const char *line; /* The start of line to match. */
518 int linelen; /* Size of string to match. */
519 int fg, bg, attr; /* Color and text attributes for the lines. */
520 };
521
522 static struct line_info line_info[] = {
523 #define LINE(type, line, fg, bg, attr) \
524 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
525 LINE_INFO
526 #undef LINE
527 };
528
529 static enum line_type
530 get_line_type(char *line)
531 {
532 int linelen = strlen(line);
533 enum line_type type;
534
535 for (type = 0; type < ARRAY_SIZE(line_info); type++)
536 /* Case insensitive search matches Signed-off-by lines better. */
537 if (linelen >= line_info[type].linelen &&
538 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
539 return type;
540
541 return LINE_DEFAULT;
542 }
543
544 static inline int
545 get_line_attr(enum line_type type)
546 {
547 assert(type < ARRAY_SIZE(line_info));
548 return COLOR_PAIR(type) | line_info[type].attr;
549 }
550
551 static struct line_info *
552 get_line_info(char *name, int namelen)
553 {
554 enum line_type type;
555 int i;
556
557 /* Diff-Header -> DIFF_HEADER */
558 for (i = 0; i < namelen; i++) {
559 if (name[i] == '-')
560 name[i] = '_';
561 else if (name[i] == '.')
562 name[i] = '_';
563 }
564
565 for (type = 0; type < ARRAY_SIZE(line_info); type++)
566 if (namelen == line_info[type].namelen &&
567 !strncasecmp(line_info[type].name, name, namelen))
568 return &line_info[type];
569
570 return NULL;
571 }
572
573 static void
574 init_colors(void)
575 {
576 int default_bg = COLOR_BLACK;
577 int default_fg = COLOR_WHITE;
578 enum line_type type;
579
580 start_color();
581
582 if (use_default_colors() != ERR) {
583 default_bg = -1;
584 default_fg = -1;
585 }
586
587 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
588 struct line_info *info = &line_info[type];
589 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
590 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
591
592 init_pair(type, fg, bg);
593 }
594 }
595
596 struct line {
597 enum line_type type;
598 void *data; /* User data */
599 };
600
601
602 /*
603 * Keys
604 */
605
606 struct keymap {
607 int alias;
608 int request;
609 };
610
611 static struct keymap keymap[] = {
612 /* View switching */
613 { 'm', REQ_VIEW_MAIN },
614 { 'd', REQ_VIEW_DIFF },
615 { 'l', REQ_VIEW_LOG },
616 { 'p', REQ_VIEW_PAGER },
617 { 'h', REQ_VIEW_HELP },
618 { '?', REQ_VIEW_HELP },
619
620 /* View manipulation */
621 { 'q', REQ_VIEW_CLOSE },
622 { KEY_TAB, REQ_VIEW_NEXT },
623 { KEY_RETURN, REQ_ENTER },
624 { KEY_UP, REQ_PREVIOUS },
625 { KEY_DOWN, REQ_NEXT },
626
627 /* Cursor navigation */
628 { 'k', REQ_MOVE_UP },
629 { 'j', REQ_MOVE_DOWN },
630 { KEY_HOME, REQ_MOVE_FIRST_LINE },
631 { KEY_END, REQ_MOVE_LAST_LINE },
632 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
633 { ' ', REQ_MOVE_PAGE_DOWN },
634 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
635 { 'b', REQ_MOVE_PAGE_UP },
636 { '-', REQ_MOVE_PAGE_UP },
637
638 /* Scrolling */
639 { KEY_IC, REQ_SCROLL_LINE_UP },
640 { KEY_DC, REQ_SCROLL_LINE_DOWN },
641 { 'w', REQ_SCROLL_PAGE_UP },
642 { 's', REQ_SCROLL_PAGE_DOWN },
643
644 /* Misc */
645 { 'Q', REQ_QUIT },
646 { 'z', REQ_STOP_LOADING },
647 { 'v', REQ_SHOW_VERSION },
648 { 'r', REQ_SCREEN_REDRAW },
649 { 'n', REQ_TOGGLE_LINENO },
650 { 'g', REQ_TOGGLE_REV_GRAPH},
651 { ':', REQ_PROMPT },
652
653 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
654 { ERR, REQ_SCREEN_UPDATE },
655
656 /* Use the ncurses SIGWINCH handler. */
657 { KEY_RESIZE, REQ_SCREEN_RESIZE },
658 };
659
660 static enum request
661 get_request(int key)
662 {
663 int i;
664
665 for (i = 0; i < ARRAY_SIZE(keymap); i++)
666 if (keymap[i].alias == key)
667 return keymap[i].request;
668
669 return (enum request) key;
670 }
671
672 struct key {
673 char *name;
674 int value;
675 };
676
677 static struct key key_table[] = {
678 { "Enter", KEY_RETURN },
679 { "Space", ' ' },
680 { "Backspace", KEY_BACKSPACE },
681 { "Tab", KEY_TAB },
682 { "Escape", KEY_ESC },
683 { "Left", KEY_LEFT },
684 { "Right", KEY_RIGHT },
685 { "Up", KEY_UP },
686 { "Down", KEY_DOWN },
687 { "Insert", KEY_IC },
688 { "Delete", KEY_DC },
689 { "Home", KEY_HOME },
690 { "End", KEY_END },
691 { "PageUp", KEY_PPAGE },
692 { "PageDown", KEY_NPAGE },
693 { "F1", KEY_F(1) },
694 { "F2", KEY_F(2) },
695 { "F3", KEY_F(3) },
696 { "F4", KEY_F(4) },
697 { "F5", KEY_F(5) },
698 { "F6", KEY_F(6) },
699 { "F7", KEY_F(7) },
700 { "F8", KEY_F(8) },
701 { "F9", KEY_F(9) },
702 { "F10", KEY_F(10) },
703 { "F11", KEY_F(11) },
704 { "F12", KEY_F(12) },
705 };
706
707 static char *
708 get_key(enum request request)
709 {
710 static char buf[BUFSIZ];
711 static char key_char[] = "'X'";
712 int pos = 0;
713 char *sep = " ";
714 int i;
715
716 buf[pos] = 0;
717
718 for (i = 0; i < ARRAY_SIZE(keymap); i++) {
719 char *seq = NULL;
720 int key;
721
722 if (keymap[i].request != request)
723 continue;
724
725 for (key = 0; key < ARRAY_SIZE(key_table); key++)
726 if (key_table[key].value == keymap[i].alias)
727 seq = key_table[key].name;
728
729 if (seq == NULL &&
730 keymap[i].alias < 127 &&
731 isprint(keymap[i].alias)) {
732 key_char[1] = (char) keymap[i].alias;
733 seq = key_char;
734 }
735
736 if (!seq)
737 seq = "'?'";
738
739 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
740 return "Too many keybindings!";
741 sep = ", ";
742 }
743
744 return buf;
745 }
746
747
748 /*
749 * User config file handling.
750 */
751
752 static struct int_map color_map[] = {
753 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
754 COLOR_MAP(DEFAULT),
755 COLOR_MAP(BLACK),
756 COLOR_MAP(BLUE),
757 COLOR_MAP(CYAN),
758 COLOR_MAP(GREEN),
759 COLOR_MAP(MAGENTA),
760 COLOR_MAP(RED),
761 COLOR_MAP(WHITE),
762 COLOR_MAP(YELLOW),
763 };
764
765 #define set_color(color, name) \
766 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
767
768 static struct int_map attr_map[] = {
769 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
770 ATTR_MAP(NORMAL),
771 ATTR_MAP(BLINK),
772 ATTR_MAP(BOLD),
773 ATTR_MAP(DIM),
774 ATTR_MAP(REVERSE),
775 ATTR_MAP(STANDOUT),
776 ATTR_MAP(UNDERLINE),
777 };
778
779 #define set_attribute(attr, name) \
780 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
781
782 static int config_lineno;
783 static bool config_errors;
784 static char *config_msg;
785
786 /* Wants: object fgcolor bgcolor [attr] */
787 static int
788 option_color_command(int argc, char *argv[])
789 {
790 struct line_info *info;
791
792 if (argc != 3 && argc != 4) {
793 config_msg = "Wrong number of arguments given to color command";
794 return ERR;
795 }
796
797 info = get_line_info(argv[0], strlen(argv[0]));
798 if (!info) {
799 config_msg = "Unknown color name";
800 return ERR;
801 }
802
803 if (set_color(&info->fg, argv[1]) == ERR) {
804 config_msg = "Unknown color";
805 return ERR;
806 }
807
808 if (set_color(&info->bg, argv[2]) == ERR) {
809 config_msg = "Unknown color";
810 return ERR;
811 }
812
813 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
814 config_msg = "Unknown attribute";
815 return ERR;
816 }
817
818 return OK;
819 }
820
821 /* Wants: name = value */
822 static int
823 option_set_command(int argc, char *argv[])
824 {
825 if (argc != 3) {
826 config_msg = "Wrong number of arguments given to set command";
827 return ERR;
828 }
829
830 if (strcmp(argv[1], "=")) {
831 config_msg = "No value assigned";
832 return ERR;
833 }
834
835 if (!strcmp(argv[0], "show-rev-graph")) {
836 opt_rev_graph = (!strcmp(argv[2], "1") ||
837 !strcmp(argv[2], "true") ||
838 !strcmp(argv[2], "yes"));
839 return OK;
840 }
841
842 if (!strcmp(argv[0], "line-number-interval")) {
843 opt_num_interval = atoi(argv[2]);
844 return OK;
845 }
846
847 if (!strcmp(argv[0], "tab-size")) {
848 opt_tab_size = atoi(argv[2]);
849 return OK;
850 }
851
852 if (!strcmp(argv[0], "encoding")) {
853 string_copy(opt_encoding, argv[2]);
854 return OK;
855 }
856
857 return ERR;
858 }
859
860 static int
861 set_option(char *opt, char *value)
862 {
863 char *argv[16];
864 int valuelen;
865 int argc = 0;
866
867 /* Tokenize */
868 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
869 argv[argc++] = value;
870
871 value += valuelen;
872 if (!*value)
873 break;
874
875 *value++ = 0;
876 while (isspace(*value))
877 value++;
878 }
879
880 if (!strcmp(opt, "color"))
881 return option_color_command(argc, argv);
882
883 if (!strcmp(opt, "set"))
884 return option_set_command(argc, argv);
885
886 return ERR;
887 }
888
889 static int
890 read_option(char *opt, int optlen, char *value, int valuelen)
891 {
892 config_lineno++;
893 config_msg = "Internal error";
894
895 optlen = strcspn(opt, "#;");
896 if (optlen == 0) {
897 /* The whole line is a commend or empty. */
898 return OK;
899
900 } else if (opt[optlen] != 0) {
901 /* Part of the option name is a comment, so the value part
902 * should be ignored. */
903 valuelen = 0;
904 opt[optlen] = value[valuelen] = 0;
905 } else {
906 /* Else look for comment endings in the value. */
907 valuelen = strcspn(value, "#;");
908 value[valuelen] = 0;
909 }
910
911 if (set_option(opt, value) == ERR) {
912 fprintf(stderr, "Error on line %d, near '%.*s' option: %s\n",
913 config_lineno, optlen, opt, config_msg);
914 config_errors = TRUE;
915 }
916
917 /* Always keep going if errors are encountered. */
918 return OK;
919 }
920
921 static int
922 load_options(void)
923 {
924 char *home = getenv("HOME");
925 char buf[1024];
926 FILE *file;
927
928 config_lineno = 0;
929 config_errors = FALSE;
930
931 if (!home || !string_format(buf, "%s/.tigrc", home))
932 return ERR;
933
934 /* It's ok that the file doesn't exist. */
935 file = fopen(buf, "r");
936 if (!file)
937 return OK;
938
939 if (read_properties(file, " \t", read_option) == ERR ||
940 config_errors == TRUE)
941 fprintf(stderr, "Errors while loading %s.\n", buf);
942
943 return OK;
944 }
945
946
947 /*
948 * The viewer
949 */
950
951 struct view;
952 struct view_ops;
953
954 /* The display array of active views and the index of the current view. */
955 static struct view *display[2];
956 static unsigned int current_view;
957
958 #define foreach_view(view, i) \
959 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
960
961 #define displayed_views() (display[1] != NULL ? 2 : 1)
962
963 /* Current head and commit ID */
964 static char ref_commit[SIZEOF_REF] = "HEAD";
965 static char ref_head[SIZEOF_REF] = "HEAD";
966
967 struct view {
968 const char *name; /* View name */
969 const char *cmd_fmt; /* Default command line format */
970 const char *cmd_env; /* Command line set via environment */
971 const char *id; /* Points to either of ref_{head,commit} */
972
973 struct view_ops *ops; /* View operations */
974
975 char cmd[SIZEOF_CMD]; /* Command buffer */
976 char ref[SIZEOF_REF]; /* Hovered commit reference */
977 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
978
979 int height, width; /* The width and height of the main window */
980 WINDOW *win; /* The main window */
981 WINDOW *title; /* The title window living below the main window */
982
983 /* Navigation */
984 unsigned long offset; /* Offset of the window top */
985 unsigned long lineno; /* Current line number */
986
987 /* If non-NULL, points to the view that opened this view. If this view
988 * is closed tig will switch back to the parent view. */
989 struct view *parent;
990
991 /* Buffering */
992 unsigned long lines; /* Total number of lines */
993 struct line *line; /* Line index */
994 unsigned long line_size;/* Total number of allocated lines */
995 unsigned int digits; /* Number of digits in the lines member. */
996
997 /* Loading */
998 FILE *pipe;
999 time_t start_time;
1000 };
1001
1002 struct view_ops {
1003 /* What type of content being displayed. Used in the title bar. */
1004 const char *type;
1005 /* Draw one line; @lineno must be < view->height. */
1006 bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1007 /* Read one line; updates view->line. */
1008 bool (*read)(struct view *view, char *data);
1009 /* Depending on view, change display based on current line. */
1010 bool (*enter)(struct view *view, struct line *line);
1011 };
1012
1013 static struct view_ops pager_ops;
1014 static struct view_ops main_ops;
1015
1016 #define VIEW_STR(name, cmd, env, ref, ops) \
1017 { name, cmd, #env, ref, ops }
1018
1019 #define VIEW_(id, name, ops, ref) \
1020 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops)
1021
1022
1023 static struct view views[] = {
1024 VIEW_(MAIN, "main", &main_ops, ref_head),
1025 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1026 VIEW_(LOG, "log", &pager_ops, ref_head),
1027 VIEW_(HELP, "help", &pager_ops, "static"),
1028 VIEW_(PAGER, "pager", &pager_ops, "static"),
1029 };
1030
1031 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1032
1033
1034 static bool
1035 draw_view_line(struct view *view, unsigned int lineno)
1036 {
1037 if (view->offset + lineno >= view->lines)
1038 return FALSE;
1039
1040 return view->ops->draw(view, &view->line[view->offset + lineno], lineno);
1041 }
1042
1043 static void
1044 redraw_view_from(struct view *view, int lineno)
1045 {
1046 assert(0 <= lineno && lineno < view->height);
1047
1048 for (; lineno < view->height; lineno++) {
1049 if (!draw_view_line(view, lineno))
1050 break;
1051 }
1052
1053 redrawwin(view->win);
1054 wrefresh(view->win);
1055 }
1056
1057 static void
1058 redraw_view(struct view *view)
1059 {
1060 wclear(view->win);
1061 redraw_view_from(view, 0);
1062 }
1063
1064
1065 static void
1066 update_view_title(struct view *view)
1067 {
1068 if (view == display[current_view])
1069 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1070 else
1071 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1072
1073 werase(view->title);
1074 wmove(view->title, 0, 0);
1075
1076 if (*view->ref)
1077 wprintw(view->title, "[%s] %s", view->name, view->ref);
1078 else
1079 wprintw(view->title, "[%s]", view->name);
1080
1081 if (view->lines || view->pipe) {
1082 unsigned int view_lines = view->offset + view->height;
1083 unsigned int lines = view->lines
1084 ? MIN(view_lines, view->lines) * 100 / view->lines
1085 : 0;
1086
1087 wprintw(view->title, " - %s %d of %d (%d%%)",
1088 view->ops->type,
1089 view->lineno + 1,
1090 view->lines,
1091 lines);
1092 }
1093
1094 if (view->pipe) {
1095 time_t secs = time(NULL) - view->start_time;
1096
1097 /* Three git seconds are a long time ... */
1098 if (secs > 2)
1099 wprintw(view->title, " %lds", secs);
1100 }
1101
1102 wmove(view->title, 0, view->width - 1);
1103 wrefresh(view->title);
1104 }
1105
1106 static void
1107 resize_display(void)
1108 {
1109 int offset, i;
1110 struct view *base = display[0];
1111 struct view *view = display[1] ? display[1] : display[0];
1112
1113 /* Setup window dimensions */
1114
1115 getmaxyx(stdscr, base->height, base->width);
1116
1117 /* Make room for the status window. */
1118 base->height -= 1;
1119
1120 if (view != base) {
1121 /* Horizontal split. */
1122 view->width = base->width;
1123 view->height = SCALE_SPLIT_VIEW(base->height);
1124 base->height -= view->height;
1125
1126 /* Make room for the title bar. */
1127 view->height -= 1;
1128 }
1129
1130 /* Make room for the title bar. */
1131 base->height -= 1;
1132
1133 offset = 0;
1134
1135 foreach_view (view, i) {
1136 if (!view->win) {
1137 view->win = newwin(view->height, 0, offset, 0);
1138 if (!view->win)
1139 die("Failed to create %s view", view->name);
1140
1141 scrollok(view->win, TRUE);
1142
1143 view->title = newwin(1, 0, offset + view->height, 0);
1144 if (!view->title)
1145 die("Failed to create title window");
1146
1147 } else {
1148 wresize(view->win, view->height, view->width);
1149 mvwin(view->win, offset, 0);
1150 mvwin(view->title, offset + view->height, 0);
1151 }
1152
1153 offset += view->height + 1;
1154 }
1155 }
1156
1157 static void
1158 redraw_display(void)
1159 {
1160 struct view *view;
1161 int i;
1162
1163 foreach_view (view, i) {
1164 redraw_view(view);
1165 update_view_title(view);
1166 }
1167 }
1168
1169 static void
1170 update_display_cursor(void)
1171 {
1172 struct view *view = display[current_view];
1173
1174 /* Move the cursor to the right-most column of the cursor line.
1175 *
1176 * XXX: This could turn out to be a bit expensive, but it ensures that
1177 * the cursor does not jump around. */
1178 if (view->lines) {
1179 wmove(view->win, view->lineno - view->offset, view->width - 1);
1180 wrefresh(view->win);
1181 }
1182 }
1183
1184 /*
1185 * Navigation
1186 */
1187
1188 /* Scrolling backend */
1189 static void
1190 do_scroll_view(struct view *view, int lines, bool redraw)
1191 {
1192 /* The rendering expects the new offset. */
1193 view->offset += lines;
1194
1195 assert(0 <= view->offset && view->offset < view->lines);
1196 assert(lines);
1197
1198 /* Redraw the whole screen if scrolling is pointless. */
1199 if (view->height < ABS(lines)) {
1200 redraw_view(view);
1201
1202 } else {
1203 int line = lines > 0 ? view->height - lines : 0;
1204 int end = line + ABS(lines);
1205
1206 wscrl(view->win, lines);
1207
1208 for (; line < end; line++) {
1209 if (!draw_view_line(view, line))
1210 break;
1211 }
1212 }
1213
1214 /* Move current line into the view. */
1215 if (view->lineno < view->offset) {
1216 view->lineno = view->offset;
1217 draw_view_line(view, 0);
1218
1219 } else if (view->lineno >= view->offset + view->height) {
1220 if (view->lineno == view->offset + view->height) {
1221 /* Clear the hidden line so it doesn't show if the view
1222 * is scrolled up. */
1223 wmove(view->win, view->height, 0);
1224 wclrtoeol(view->win);
1225 }
1226 view->lineno = view->offset + view->height - 1;
1227 draw_view_line(view, view->lineno - view->offset);
1228 }
1229
1230 assert(view->offset <= view->lineno && view->lineno < view->lines);
1231
1232 if (!redraw)
1233 return;
1234
1235 redrawwin(view->win);
1236 wrefresh(view->win);
1237 report("");
1238 }
1239
1240 /* Scroll frontend */
1241 static void
1242 scroll_view(struct view *view, enum request request)
1243 {
1244 int lines = 1;
1245
1246 switch (request) {
1247 case REQ_SCROLL_PAGE_DOWN:
1248 lines = view->height;
1249 case REQ_SCROLL_LINE_DOWN:
1250 if (view->offset + lines > view->lines)
1251 lines = view->lines - view->offset;
1252
1253 if (lines == 0 || view->offset + view->height >= view->lines) {
1254 report("Cannot scroll beyond the last line");
1255 return;
1256 }
1257 break;
1258
1259 case REQ_SCROLL_PAGE_UP:
1260 lines = view->height;
1261 case REQ_SCROLL_LINE_UP:
1262 if (lines > view->offset)
1263 lines = view->offset;
1264
1265 if (lines == 0) {
1266 report("Cannot scroll beyond the first line");
1267 return;
1268 }
1269
1270 lines = -lines;
1271 break;
1272
1273 default:
1274 die("request %d not handled in switch", request);
1275 }
1276
1277 do_scroll_view(view, lines, TRUE);
1278 }
1279
1280 /* Cursor moving */
1281 static void
1282 move_view(struct view *view, enum request request, bool redraw)
1283 {
1284 int steps;
1285
1286 switch (request) {
1287 case REQ_MOVE_FIRST_LINE:
1288 steps = -view->lineno;
1289 break;
1290
1291 case REQ_MOVE_LAST_LINE:
1292 steps = view->lines - view->lineno - 1;
1293 break;
1294
1295 case REQ_MOVE_PAGE_UP:
1296 steps = view->height > view->lineno
1297 ? -view->lineno : -view->height;
1298 break;
1299
1300 case REQ_MOVE_PAGE_DOWN:
1301 steps = view->lineno + view->height >= view->lines
1302 ? view->lines - view->lineno - 1 : view->height;
1303 break;
1304
1305 case REQ_MOVE_UP:
1306 steps = -1;
1307 break;
1308
1309 case REQ_MOVE_DOWN:
1310 steps = 1;
1311 break;
1312
1313 default:
1314 die("request %d not handled in switch", request);
1315 }
1316
1317 if (steps <= 0 && view->lineno == 0) {
1318 report("Cannot move beyond the first line");
1319 return;
1320
1321 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1322 report("Cannot move beyond the last line");
1323 return;
1324 }
1325
1326 /* Move the current line */
1327 view->lineno += steps;
1328 assert(0 <= view->lineno && view->lineno < view->lines);
1329
1330 /* Repaint the old "current" line if we be scrolling */
1331 if (ABS(steps) < view->height) {
1332 int prev_lineno = view->lineno - steps - view->offset;
1333
1334 wmove(view->win, prev_lineno, 0);
1335 wclrtoeol(view->win);
1336 draw_view_line(view, prev_lineno);
1337 }
1338
1339 /* Check whether the view needs to be scrolled */
1340 if (view->lineno < view->offset ||
1341 view->lineno >= view->offset + view->height) {
1342 if (steps < 0 && -steps > view->offset) {
1343 steps = -view->offset;
1344
1345 } else if (steps > 0) {
1346 if (view->lineno == view->lines - 1 &&
1347 view->lines > view->height) {
1348 steps = view->lines - view->offset - 1;
1349 if (steps >= view->height)
1350 steps -= view->height - 1;
1351 }
1352 }
1353
1354 do_scroll_view(view, steps, redraw);
1355 return;
1356 }
1357
1358 /* Draw the current line */
1359 draw_view_line(view, view->lineno - view->offset);
1360
1361 if (!redraw)
1362 return;
1363
1364 redrawwin(view->win);
1365 wrefresh(view->win);
1366 report("");
1367 }
1368
1369
1370 /*
1371 * Incremental updating
1372 */
1373
1374 static void
1375 end_update(struct view *view)
1376 {
1377 if (!view->pipe)
1378 return;
1379 set_nonblocking_input(FALSE);
1380 if (view->pipe == stdin)
1381 fclose(view->pipe);
1382 else
1383 pclose(view->pipe);
1384 view->pipe = NULL;
1385 }
1386
1387 static bool
1388 begin_update(struct view *view)
1389 {
1390 const char *id = view->id;
1391
1392 if (view->pipe)
1393 end_update(view);
1394
1395 if (opt_cmd[0]) {
1396 string_copy(view->cmd, opt_cmd);
1397 opt_cmd[0] = 0;
1398 /* When running random commands, the view ref could have become
1399 * invalid so clear it. */
1400 view->ref[0] = 0;
1401 } else {
1402 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1403
1404 if (!string_format(view->cmd, format, id, id, id, id, id))
1405 return FALSE;
1406 }
1407
1408 /* Special case for the pager view. */
1409 if (opt_pipe) {
1410 view->pipe = opt_pipe;
1411 opt_pipe = NULL;
1412 } else {
1413 view->pipe = popen(view->cmd, "r");
1414 }
1415
1416 if (!view->pipe)
1417 return FALSE;
1418
1419 set_nonblocking_input(TRUE);
1420
1421 view->offset = 0;
1422 view->lines = 0;
1423 view->lineno = 0;
1424 string_copy(view->vid, id);
1425
1426 if (view->line) {
1427 int i;
1428
1429 for (i = 0; i < view->lines; i++)
1430 if (view->line[i].data)
1431 free(view->line[i].data);
1432
1433 free(view->line);
1434 view->line = NULL;
1435 }
1436
1437 view->start_time = time(NULL);
1438
1439 return TRUE;
1440 }
1441
1442 static struct line *
1443 realloc_lines(struct view *view, size_t line_size)
1444 {
1445 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1446
1447 if (!tmp)
1448 return NULL;
1449
1450 view->line = tmp;
1451 view->line_size = line_size;
1452 return view->line;
1453 }
1454
1455 static bool
1456 update_view(struct view *view)
1457 {
1458 char buffer[BUFSIZ];
1459 char *line;
1460 /* The number of lines to read. If too low it will cause too much
1461 * redrawing (and possible flickering), if too high responsiveness
1462 * will suffer. */
1463 unsigned long lines = view->height;
1464 int redraw_from = -1;
1465
1466 if (!view->pipe)
1467 return TRUE;
1468
1469 /* Only redraw if lines are visible. */
1470 if (view->offset + view->height >= view->lines)
1471 redraw_from = view->lines - view->offset;
1472
1473 if (!realloc_lines(view, view->lines + lines))
1474 goto alloc_error;
1475
1476 while ((line = fgets(buffer, sizeof(buffer), view->pipe))) {
1477 int linelen = strlen(line);
1478
1479 if (linelen)
1480 line[linelen - 1] = 0;
1481
1482 if (!view->ops->read(view, line))
1483 goto alloc_error;
1484
1485 if (lines-- == 1)
1486 break;
1487 }
1488
1489 {
1490 int digits;
1491
1492 lines = view->lines;
1493 for (digits = 0; lines; digits++)
1494 lines /= 10;
1495
1496 /* Keep the displayed view in sync with line number scaling. */
1497 if (digits != view->digits) {
1498 view->digits = digits;
1499 redraw_from = 0;
1500 }
1501 }
1502
1503 if (redraw_from >= 0) {
1504 /* If this is an incremental update, redraw the previous line
1505 * since for commits some members could have changed when
1506 * loading the main view. */
1507 if (redraw_from > 0)
1508 redraw_from--;
1509
1510 /* Incrementally draw avoids flickering. */
1511 redraw_view_from(view, redraw_from);
1512 }
1513
1514 /* Update the title _after_ the redraw so that if the redraw picks up a
1515 * commit reference in view->ref it'll be available here. */
1516 update_view_title(view);
1517
1518 if (ferror(view->pipe)) {
1519 report("Failed to read: %s", strerror(errno));
1520 goto end;
1521
1522 } else if (feof(view->pipe)) {
1523 report("");
1524 goto end;
1525 }
1526
1527 return TRUE;
1528
1529 alloc_error:
1530 report("Allocation failure");
1531
1532 end:
1533 end_update(view);
1534 return FALSE;
1535 }
1536
1537
1538 /*
1539 * View opening
1540 */
1541
1542 static void open_help_view(struct view *view)
1543 {
1544 char buf[BUFSIZ];
1545 int lines = ARRAY_SIZE(req_info) + 2;
1546 int i;
1547
1548 if (view->lines > 0)
1549 return;
1550
1551 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1552 if (!req_info[i].request)
1553 lines++;
1554
1555 view->line = calloc(lines, sizeof(*view->line));
1556 if (!view->line) {
1557 report("Allocation failure");
1558 return;
1559 }
1560
1561 view->ops->read(view, "Quick reference for tig keybindings:");
1562
1563 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1564 char *key;
1565
1566 if (!req_info[i].request) {
1567 view->ops->read(view, "");
1568 view->ops->read(view, req_info[i].help);
1569 continue;
1570 }
1571
1572 key = get_key(req_info[i].request);
1573 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1574 continue;
1575
1576 view->ops->read(view, buf);
1577 }
1578 }
1579
1580 enum open_flags {
1581 OPEN_DEFAULT = 0, /* Use default view switching. */
1582 OPEN_SPLIT = 1, /* Split current view. */
1583 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1584 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1585 };
1586
1587 static void
1588 open_view(struct view *prev, enum request request, enum open_flags flags)
1589 {
1590 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1591 bool split = !!(flags & OPEN_SPLIT);
1592 bool reload = !!(flags & OPEN_RELOAD);
1593 struct view *view = VIEW(request);
1594 int nviews = displayed_views();
1595 struct view *base_view = display[0];
1596
1597 if (view == prev && nviews == 1 && !reload) {
1598 report("Already in %s view", view->name);
1599 return;
1600 }
1601
1602 if (view == VIEW(REQ_VIEW_HELP)) {
1603 open_help_view(view);
1604
1605 } else if ((reload || strcmp(view->vid, view->id)) &&
1606 !begin_update(view)) {
1607 report("Failed to load %s view", view->name);
1608 return;
1609 }
1610
1611 if (split) {
1612 display[1] = view;
1613 if (!backgrounded)
1614 current_view = 1;
1615 } else {
1616 /* Maximize the current view. */
1617 memset(display, 0, sizeof(display));
1618 current_view = 0;
1619 display[current_view] = view;
1620 }
1621
1622 /* Resize the view when switching between split- and full-screen,
1623 * or when switching between two different full-screen views. */
1624 if (nviews != displayed_views() ||
1625 (nviews == 1 && base_view != display[0]))
1626 resize_display();
1627
1628 if (split && prev->lineno - prev->offset >= prev->height) {
1629 /* Take the title line into account. */
1630 int lines = prev->lineno - prev->offset - prev->height + 1;
1631
1632 /* Scroll the view that was split if the current line is
1633 * outside the new limited view. */
1634 do_scroll_view(prev, lines, TRUE);
1635 }
1636
1637 if (prev && view != prev) {
1638 if (split && !backgrounded) {
1639 /* "Blur" the previous view. */
1640 update_view_title(prev);
1641 }
1642
1643 view->parent = prev;
1644 }
1645
1646 if (view->pipe && view->lines == 0) {
1647 /* Clear the old view and let the incremental updating refill
1648 * the screen. */
1649 wclear(view->win);
1650 report("");
1651 } else {
1652 redraw_view(view);
1653 report("");
1654 }
1655
1656 /* If the view is backgrounded the above calls to report()
1657 * won't redraw the view title. */
1658 if (backgrounded)
1659 update_view_title(view);
1660 }
1661
1662
1663 /*
1664 * User request switch noodle
1665 */
1666
1667 static int
1668 view_driver(struct view *view, enum request request)
1669 {
1670 int i;
1671
1672 switch (request) {
1673 case REQ_MOVE_UP:
1674 case REQ_MOVE_DOWN:
1675 case REQ_MOVE_PAGE_UP:
1676 case REQ_MOVE_PAGE_DOWN:
1677 case REQ_MOVE_FIRST_LINE:
1678 case REQ_MOVE_LAST_LINE:
1679 move_view(view, request, TRUE);
1680 break;
1681
1682 case REQ_SCROLL_LINE_DOWN:
1683 case REQ_SCROLL_LINE_UP:
1684 case REQ_SCROLL_PAGE_DOWN:
1685 case REQ_SCROLL_PAGE_UP:
1686 scroll_view(view, request);
1687 break;
1688
1689 case REQ_VIEW_MAIN:
1690 case REQ_VIEW_DIFF:
1691 case REQ_VIEW_LOG:
1692 case REQ_VIEW_HELP:
1693 case REQ_VIEW_PAGER:
1694 open_view(view, request, OPEN_DEFAULT);
1695 break;
1696
1697 case REQ_NEXT:
1698 case REQ_PREVIOUS:
1699 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
1700
1701 if (view == VIEW(REQ_VIEW_DIFF) &&
1702 view->parent == VIEW(REQ_VIEW_MAIN)) {
1703 bool redraw = display[1] == view;
1704
1705 view = view->parent;
1706 move_view(view, request, redraw);
1707 if (redraw)
1708 update_view_title(view);
1709 } else {
1710 move_view(view, request, TRUE);
1711 break;
1712 }
1713 /* Fall-through */
1714
1715 case REQ_ENTER:
1716 if (!view->lines) {
1717 report("Nothing to enter");
1718 break;
1719 }
1720 return view->ops->enter(view, &view->line[view->lineno]);
1721
1722 case REQ_VIEW_NEXT:
1723 {
1724 int nviews = displayed_views();
1725 int next_view = (current_view + 1) % nviews;
1726
1727 if (next_view == current_view) {
1728 report("Only one view is displayed");
1729 break;
1730 }
1731
1732 current_view = next_view;
1733 /* Blur out the title of the previous view. */
1734 update_view_title(view);
1735 report("");
1736 break;
1737 }
1738 case REQ_TOGGLE_LINENO:
1739 opt_line_number = !opt_line_number;
1740 redraw_display();
1741 break;
1742
1743 case REQ_TOGGLE_REV_GRAPH:
1744 opt_rev_graph = !opt_rev_graph;
1745 redraw_display();
1746 break;
1747
1748 case REQ_PROMPT:
1749 /* Always reload^Wrerun commands from the prompt. */
1750 open_view(view, opt_request, OPEN_RELOAD);
1751 break;
1752
1753 case REQ_STOP_LOADING:
1754 for (i = 0; i < ARRAY_SIZE(views); i++) {
1755 view = &views[i];
1756 if (view->pipe)
1757 report("Stopped loading the %s view", view->name),
1758 end_update(view);
1759 }
1760 break;
1761
1762 case REQ_SHOW_VERSION:
1763 report("%s (built %s)", VERSION, __DATE__);
1764 return TRUE;
1765
1766 case REQ_SCREEN_RESIZE:
1767 resize_display();
1768 /* Fall-through */
1769 case REQ_SCREEN_REDRAW:
1770 redraw_display();
1771 break;
1772
1773 case REQ_SCREEN_UPDATE:
1774 doupdate();
1775 return TRUE;
1776
1777 case REQ_VIEW_CLOSE:
1778 /* XXX: Mark closed views by letting view->parent point to the
1779 * view itself. Parents to closed view should never be
1780 * followed. */
1781 if (view->parent &&
1782 view->parent->parent != view->parent) {
1783 memset(display, 0, sizeof(display));
1784 current_view = 0;
1785 display[current_view] = view->parent;
1786 view->parent = view;
1787 resize_display();
1788 redraw_display();
1789 break;
1790 }
1791 /* Fall-through */
1792 case REQ_QUIT:
1793 return FALSE;
1794
1795 default:
1796 /* An unknown key will show most commonly used commands. */
1797 report("Unknown key, press 'h' for help");
1798 return TRUE;
1799 }
1800
1801 return TRUE;
1802 }
1803
1804
1805 /*
1806 * Pager backend
1807 */
1808
1809 static bool
1810 pager_draw(struct view *view, struct line *line, unsigned int lineno)
1811 {
1812 char *text = line->data;
1813 enum line_type type = line->type;
1814 int textlen = strlen(text);
1815 int attr;
1816
1817 wmove(view->win, lineno, 0);
1818
1819 if (view->offset + lineno == view->lineno) {
1820 if (type == LINE_COMMIT) {
1821 string_copy(view->ref, text + 7);
1822 string_copy(ref_commit, view->ref);
1823 }
1824
1825 type = LINE_CURSOR;
1826 wchgat(view->win, -1, 0, type, NULL);
1827 }
1828
1829 attr = get_line_attr(type);
1830 wattrset(view->win, attr);
1831
1832 if (opt_line_number || opt_tab_size < TABSIZE) {
1833 static char spaces[] = " ";
1834 int col_offset = 0, col = 0;
1835
1836 if (opt_line_number) {
1837 unsigned long real_lineno = view->offset + lineno + 1;
1838
1839 if (real_lineno == 1 ||
1840 (real_lineno % opt_num_interval) == 0) {
1841 wprintw(view->win, "%.*d", view->digits, real_lineno);
1842
1843 } else {
1844 waddnstr(view->win, spaces,
1845 MIN(view->digits, STRING_SIZE(spaces)));
1846 }
1847 waddstr(view->win, ": ");
1848 col_offset = view->digits + 2;
1849 }
1850
1851 while (text && col_offset + col < view->width) {
1852 int cols_max = view->width - col_offset - col;
1853 char *pos = text;
1854 int cols;
1855
1856 if (*text == '\t') {
1857 text++;
1858 assert(sizeof(spaces) > TABSIZE);
1859 pos = spaces;
1860 cols = opt_tab_size - (col % opt_tab_size);
1861
1862 } else {
1863 text = strchr(text, '\t');
1864 cols = line ? text - pos : strlen(pos);
1865 }
1866
1867 waddnstr(view->win, pos, MIN(cols, cols_max));
1868 col += cols;
1869 }
1870
1871 } else {
1872 int col = 0, pos = 0;
1873
1874 for (; pos < textlen && col < view->width; pos++, col++)
1875 if (text[pos] == '\t')
1876 col += TABSIZE - (col % TABSIZE) - 1;
1877
1878 waddnstr(view->win, text, pos);
1879 }
1880
1881 return TRUE;
1882 }
1883
1884 static void
1885 add_pager_refs(struct view *view, struct line *line)
1886 {
1887 char buf[1024];
1888 char *data = line->data;
1889 struct ref **refs;
1890 int bufpos = 0, refpos = 0;
1891 const char *sep = "Refs: ";
1892
1893 assert(line->type == LINE_COMMIT);
1894
1895 refs = get_refs(data + STRING_SIZE("commit "));
1896 if (!refs)
1897 return;
1898
1899 do {
1900 struct ref *ref = refs[refpos];
1901 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
1902
1903 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
1904 return;
1905 sep = ", ";
1906 } while (refs[refpos++]->next);
1907
1908 if (!realloc_lines(view, view->line_size + 1))
1909 return;
1910
1911 line = &view->line[view->lines];
1912 line->data = strdup(buf);
1913 if (!line->data)
1914 return;
1915
1916 line->type = LINE_PP_REFS;
1917 view->lines++;
1918 }
1919
1920 static bool
1921 pager_read(struct view *view, char *data)
1922 {
1923 struct line *line = &view->line[view->lines];
1924
1925 line->data = strdup(data);
1926 if (!line->data)
1927 return FALSE;
1928
1929 line->type = get_line_type(line->data);
1930 view->lines++;
1931
1932 if (line->type == LINE_COMMIT &&
1933 (view == VIEW(REQ_VIEW_DIFF) ||
1934 view == VIEW(REQ_VIEW_LOG)))
1935 add_pager_refs(view, line);
1936
1937 return TRUE;
1938 }
1939
1940 static bool
1941 pager_enter(struct view *view, struct line *line)
1942 {
1943 int split = 0;
1944
1945 if (line->type == LINE_COMMIT &&
1946 (view == VIEW(REQ_VIEW_LOG) ||
1947 view == VIEW(REQ_VIEW_PAGER))) {
1948 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
1949 split = 1;
1950 }
1951
1952 /* Always scroll the view even if it was split. That way
1953 * you can use Enter to scroll through the log view and
1954 * split open each commit diff. */
1955 scroll_view(view, REQ_SCROLL_LINE_DOWN);
1956
1957 /* FIXME: A minor workaround. Scrolling the view will call report("")
1958 * but if we are scrolling a non-current view this won't properly
1959 * update the view title. */
1960 if (split)
1961 update_view_title(view);
1962
1963 return TRUE;
1964 }
1965
1966 static struct view_ops pager_ops = {
1967 "line",
1968 pager_draw,
1969 pager_read,
1970 pager_enter,
1971 };
1972
1973
1974 /*
1975 * Main view backend
1976 */
1977
1978 struct commit {
1979 char id[41]; /* SHA1 ID. */
1980 char title[75]; /* First line of the commit message. */
1981 char author[75]; /* Author of the commit. */
1982 struct tm time; /* Date from the author ident. */
1983 struct ref **refs; /* Repository references. */
1984 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
1985 size_t graph_size; /* The width of the graph array. */
1986 };
1987
1988 static bool
1989 main_draw(struct view *view, struct line *line, unsigned int lineno)
1990 {
1991 char buf[DATE_COLS + 1];
1992 struct commit *commit = line->data;
1993 enum line_type type;
1994 int col = 0;
1995 size_t timelen;
1996 size_t authorlen;
1997 int trimmed = 1;
1998
1999 if (!*commit->author)
2000 return FALSE;
2001
2002 wmove(view->win, lineno, col);
2003
2004 if (view->offset + lineno == view->lineno) {
2005 string_copy(view->ref, commit->id);
2006 string_copy(ref_commit, view->ref);
2007 type = LINE_CURSOR;
2008 wattrset(view->win, get_line_attr(type));
2009 wchgat(view->win, -1, 0, type, NULL);
2010
2011 } else {
2012 type = LINE_MAIN_COMMIT;
2013 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2014 }
2015
2016 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2017 waddnstr(view->win, buf, timelen);
2018 waddstr(view->win, " ");
2019
2020 col += DATE_COLS;
2021 wmove(view->win, lineno, col);
2022 if (type != LINE_CURSOR)
2023 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2024
2025 if (opt_utf8) {
2026 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2027 } else {
2028 authorlen = strlen(commit->author);
2029 if (authorlen > AUTHOR_COLS - 2) {
2030 authorlen = AUTHOR_COLS - 2;
2031 trimmed = 1;
2032 }
2033 }
2034
2035 if (trimmed) {
2036 waddnstr(view->win, commit->author, authorlen);
2037 if (type != LINE_CURSOR)
2038 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2039 waddch(view->win, '~');
2040 } else {
2041 waddstr(view->win, commit->author);
2042 }
2043
2044 col += AUTHOR_COLS;
2045 if (type != LINE_CURSOR)
2046 wattrset(view->win, A_NORMAL);
2047
2048 if (opt_rev_graph && commit->graph_size) {
2049 size_t i;
2050
2051 wmove(view->win, lineno, col);
2052 /* Using waddch() instead of waddnstr() ensures that
2053 * they'll be rendered correctly for the cursor line. */
2054 for (i = 0; i < commit->graph_size; i++)
2055 waddch(view->win, commit->graph[i]);
2056
2057 col += commit->graph_size + 1;
2058 }
2059
2060 wmove(view->win, lineno, col);
2061
2062 if (commit->refs) {
2063 size_t i = 0;
2064
2065 do {
2066 if (type == LINE_CURSOR)
2067 ;
2068 else if (commit->refs[i]->tag)
2069 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2070 else
2071 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2072 waddstr(view->win, "[");
2073 waddstr(view->win, commit->refs[i]->name);
2074 waddstr(view->win, "]");
2075 if (type != LINE_CURSOR)
2076 wattrset(view->win, A_NORMAL);
2077 waddstr(view->win, " ");
2078 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2079 } while (commit->refs[i++]->next);
2080 }
2081
2082 if (type != LINE_CURSOR)
2083 wattrset(view->win, get_line_attr(type));
2084
2085 {
2086 int titlelen = strlen(commit->title);
2087
2088 if (col + titlelen > view->width)
2089 titlelen = view->width - col;
2090
2091 waddnstr(view->win, commit->title, titlelen);
2092 }
2093
2094 return TRUE;
2095 }
2096
2097 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2098 static bool
2099 main_read(struct view *view, char *line)
2100 {
2101 enum line_type type = get_line_type(line);
2102 struct commit *commit = view->lines
2103 ? view->line[view->lines - 1].data : NULL;
2104
2105 switch (type) {
2106 case LINE_COMMIT:
2107 commit = calloc(1, sizeof(struct commit));
2108 if (!commit)
2109 return FALSE;
2110
2111 line += STRING_SIZE("commit ");
2112
2113 view->line[view->lines++].data = commit;
2114 string_copy(commit->id, line);
2115 commit->refs = get_refs(commit->id);
2116 commit->graph[commit->graph_size++] = ACS_LTEE;
2117 break;
2118
2119 case LINE_AUTHOR:
2120 {
2121 char *ident = line + STRING_SIZE("author ");
2122 char *end = strchr(ident, '<');
2123
2124 if (!commit)
2125 break;
2126
2127 if (end) {
2128 for (; end > ident && isspace(end[-1]); end--) ;
2129 *end = 0;
2130 }
2131
2132 string_copy(commit->author, ident);
2133
2134 /* Parse epoch and timezone */
2135 if (end) {
2136 char *secs = strchr(end + 1, '>');
2137 char *zone;
2138 time_t time;
2139
2140 if (!secs || secs[1] != ' ')
2141 break;
2142
2143 secs += 2;
2144 time = (time_t) atol(secs);
2145 zone = strchr(secs, ' ');
2146 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2147 long tz;
2148
2149 zone++;
2150 tz = ('0' - zone[1]) * 60 * 60 * 10;
2151 tz += ('0' - zone[2]) * 60 * 60;
2152 tz += ('0' - zone[3]) * 60;
2153 tz += ('0' - zone[4]) * 60;
2154
2155 if (zone[0] == '-')
2156 tz = -tz;
2157
2158 time -= tz;
2159 }
2160 gmtime_r(&time, &commit->time);
2161 }
2162 break;
2163 }
2164 default:
2165 if (!commit)
2166 break;
2167
2168 /* Fill in the commit title if it has not already been set. */
2169 if (commit->title[0])
2170 break;
2171
2172 /* Require titles to start with a non-space character at the
2173 * offset used by git log. */
2174 /* FIXME: More gracefull handling of titles; append "..." to
2175 * shortened titles, etc. */
2176 if (strncmp(line, " ", 4) ||
2177 isspace(line[4]))
2178 break;
2179
2180 string_copy(commit->title, line + 4);
2181 }
2182
2183 return TRUE;
2184 }
2185
2186 static bool
2187 main_enter(struct view *view, struct line *line)
2188 {
2189 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2190
2191 open_view(view, REQ_VIEW_DIFF, flags);
2192 return TRUE;
2193 }
2194
2195 static struct view_ops main_ops = {
2196 "commit",
2197 main_draw,
2198 main_read,
2199 main_enter,
2200 };
2201
2202
2203 /*
2204 * Unicode / UTF-8 handling
2205 *
2206 * NOTE: Much of the following code for dealing with unicode is derived from
2207 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2208 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2209 */
2210
2211 /* I've (over)annotated a lot of code snippets because I am not entirely
2212 * confident that the approach taken by this small UTF-8 interface is correct.
2213 * --jonas */
2214
2215 static inline int
2216 unicode_width(unsigned long c)
2217 {
2218 if (c >= 0x1100 &&
2219 (c <= 0x115f /* Hangul Jamo */
2220 || c == 0x2329
2221 || c == 0x232a
2222 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2223 /* CJK ... Yi */
2224 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2225 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2226 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2227 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2228 || (c >= 0xffe0 && c <= 0xffe6)
2229 || (c >= 0x20000 && c <= 0x2fffd)
2230 || (c >= 0x30000 && c <= 0x3fffd)))
2231 return 2;
2232
2233 return 1;
2234 }
2235
2236 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2237 * Illegal bytes are set one. */
2238 static const unsigned char utf8_bytes[256] = {
2239 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,
2240 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,
2241 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,
2242 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,
2243 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,
2244 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,
2245 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,
2246 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,
2247 };
2248
2249 /* Decode UTF-8 multi-byte representation into a unicode character. */
2250 static inline unsigned long
2251 utf8_to_unicode(const char *string, size_t length)
2252 {
2253 unsigned long unicode;
2254
2255 switch (length) {
2256 case 1:
2257 unicode = string[0];
2258 break;
2259 case 2:
2260 unicode = (string[0] & 0x1f) << 6;
2261 unicode += (string[1] & 0x3f);
2262 break;
2263 case 3:
2264 unicode = (string[0] & 0x0f) << 12;
2265 unicode += ((string[1] & 0x3f) << 6);
2266 unicode += (string[2] & 0x3f);
2267 break;
2268 case 4:
2269 unicode = (string[0] & 0x0f) << 18;
2270 unicode += ((string[1] & 0x3f) << 12);
2271 unicode += ((string[2] & 0x3f) << 6);
2272 unicode += (string[3] & 0x3f);
2273 break;
2274 case 5:
2275 unicode = (string[0] & 0x0f) << 24;
2276 unicode += ((string[1] & 0x3f) << 18);
2277 unicode += ((string[2] & 0x3f) << 12);
2278 unicode += ((string[3] & 0x3f) << 6);
2279 unicode += (string[4] & 0x3f);
2280 break;
2281 case 6:
2282 unicode = (string[0] & 0x01) << 30;
2283 unicode += ((string[1] & 0x3f) << 24);
2284 unicode += ((string[2] & 0x3f) << 18);
2285 unicode += ((string[3] & 0x3f) << 12);
2286 unicode += ((string[4] & 0x3f) << 6);
2287 unicode += (string[5] & 0x3f);
2288 break;
2289 default:
2290 die("Invalid unicode length");
2291 }
2292
2293 /* Invalid characters could return the special 0xfffd value but NUL
2294 * should be just as good. */
2295 return unicode > 0xffff ? 0 : unicode;
2296 }
2297
2298 /* Calculates how much of string can be shown within the given maximum width
2299 * and sets trimmed parameter to non-zero value if all of string could not be
2300 * shown.
2301 *
2302 * Additionally, adds to coloffset how many many columns to move to align with
2303 * the expected position. Takes into account how multi-byte and double-width
2304 * characters will effect the cursor position.
2305 *
2306 * Returns the number of bytes to output from string to satisfy max_width. */
2307 static size_t
2308 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
2309 {
2310 const char *start = string;
2311 const char *end = strchr(string, '\0');
2312 size_t mbwidth = 0;
2313 size_t width = 0;
2314
2315 *trimmed = 0;
2316
2317 while (string < end) {
2318 int c = *(unsigned char *) string;
2319 unsigned char bytes = utf8_bytes[c];
2320 size_t ucwidth;
2321 unsigned long unicode;
2322
2323 if (string + bytes > end)
2324 break;
2325
2326 /* Change representation to figure out whether
2327 * it is a single- or double-width character. */
2328
2329 unicode = utf8_to_unicode(string, bytes);
2330 /* FIXME: Graceful handling of invalid unicode character. */
2331 if (!unicode)
2332 break;
2333
2334 ucwidth = unicode_width(unicode);
2335 width += ucwidth;
2336 if (width > max_width) {
2337 *trimmed = 1;
2338 break;
2339 }
2340
2341 /* The column offset collects the differences between the
2342 * number of bytes encoding a character and the number of
2343 * columns will be used for rendering said character.
2344 *
2345 * So if some character A is encoded in 2 bytes, but will be
2346 * represented on the screen using only 1 byte this will and up
2347 * adding 1 to the multi-byte column offset.
2348 *
2349 * Assumes that no double-width character can be encoding in
2350 * less than two bytes. */
2351 if (bytes > ucwidth)
2352 mbwidth += bytes - ucwidth;
2353
2354 string += bytes;
2355 }
2356
2357 *coloffset += mbwidth;
2358
2359 return string - start;
2360 }
2361
2362
2363 /*
2364 * Status management
2365 */
2366
2367 /* Whether or not the curses interface has been initialized. */
2368 static bool cursed = FALSE;
2369
2370 /* The status window is used for polling keystrokes. */
2371 static WINDOW *status_win;
2372
2373 /* Update status and title window. */
2374 static void
2375 report(const char *msg, ...)
2376 {
2377 static bool empty = TRUE;
2378 struct view *view = display[current_view];
2379
2380 if (!empty || *msg) {
2381 va_list args;
2382
2383 va_start(args, msg);
2384
2385 werase(status_win);
2386 wmove(status_win, 0, 0);
2387 if (*msg) {
2388 vwprintw(status_win, msg, args);
2389 empty = FALSE;
2390 } else {
2391 empty = TRUE;
2392 }
2393 wrefresh(status_win);
2394
2395 va_end(args);
2396 }
2397
2398 update_view_title(view);
2399 update_display_cursor();
2400 }
2401
2402 /* Controls when nodelay should be in effect when polling user input. */
2403 static void
2404 set_nonblocking_input(bool loading)
2405 {
2406 static unsigned int loading_views;
2407
2408 if ((loading == FALSE && loading_views-- == 1) ||
2409 (loading == TRUE && loading_views++ == 0))
2410 nodelay(status_win, loading);
2411 }
2412
2413 static void
2414 init_display(void)
2415 {
2416 int x, y;
2417
2418 /* Initialize the curses library */
2419 if (isatty(STDIN_FILENO)) {
2420 cursed = !!initscr();
2421 } else {
2422 /* Leave stdin and stdout alone when acting as a pager. */
2423 FILE *io = fopen("/dev/tty", "r+");
2424
2425 cursed = !!newterm(NULL, io, io);
2426 }
2427
2428 if (!cursed)
2429 die("Failed to initialize curses");
2430
2431 nonl(); /* Tell curses not to do NL->CR/NL on output */
2432 cbreak(); /* Take input chars one at a time, no wait for \n */
2433 noecho(); /* Don't echo input */
2434 leaveok(stdscr, TRUE);
2435
2436 if (has_colors())
2437 init_colors();
2438
2439 getmaxyx(stdscr, y, x);
2440 status_win = newwin(1, 0, y - 1, 0);
2441 if (!status_win)
2442 die("Failed to create status window");
2443
2444 /* Enable keyboard mapping */
2445 keypad(status_win, TRUE);
2446 wbkgdset(status_win, get_line_attr(LINE_STATUS));
2447 }
2448
2449
2450 /*
2451 * Repository references
2452 */
2453
2454 static struct ref *refs;
2455 static size_t refs_size;
2456
2457 /* Id <-> ref store */
2458 static struct ref ***id_refs;
2459 static size_t id_refs_size;
2460
2461 static struct ref **
2462 get_refs(char *id)
2463 {
2464 struct ref ***tmp_id_refs;
2465 struct ref **ref_list = NULL;
2466 size_t ref_list_size = 0;
2467 size_t i;
2468
2469 for (i = 0; i < id_refs_size; i++)
2470 if (!strcmp(id, id_refs[i][0]->id))
2471 return id_refs[i];
2472
2473 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
2474 if (!tmp_id_refs)
2475 return NULL;
2476
2477 id_refs = tmp_id_refs;
2478
2479 for (i = 0; i < refs_size; i++) {
2480 struct ref **tmp;
2481
2482 if (strcmp(id, refs[i].id))
2483 continue;
2484
2485 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
2486 if (!tmp) {
2487 if (ref_list)
2488 free(ref_list);
2489 return NULL;
2490 }
2491
2492 ref_list = tmp;
2493 if (ref_list_size > 0)
2494 ref_list[ref_list_size - 1]->next = 1;
2495 ref_list[ref_list_size] = &refs[i];
2496
2497 /* XXX: The properties of the commit chains ensures that we can
2498 * safely modify the shared ref. The repo references will
2499 * always be similar for the same id. */
2500 ref_list[ref_list_size]->next = 0;
2501 ref_list_size++;
2502 }
2503
2504 if (ref_list)
2505 id_refs[id_refs_size++] = ref_list;
2506
2507 return ref_list;
2508 }
2509
2510 static int
2511 read_ref(char *id, int idlen, char *name, int namelen)
2512 {
2513 struct ref *ref;
2514 bool tag = FALSE;
2515
2516 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
2517 /* Commits referenced by tags has "^{}" appended. */
2518 if (name[namelen - 1] != '}')
2519 return OK;
2520
2521 while (namelen > 0 && name[namelen] != '^')
2522 namelen--;
2523
2524 tag = TRUE;
2525 namelen -= STRING_SIZE("refs/tags/");
2526 name += STRING_SIZE("refs/tags/");
2527
2528 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
2529 namelen -= STRING_SIZE("refs/heads/");
2530 name += STRING_SIZE("refs/heads/");
2531
2532 } else if (!strcmp(name, "HEAD")) {
2533 return OK;
2534 }
2535
2536 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
2537 if (!refs)
2538 return ERR;
2539
2540 ref = &refs[refs_size++];
2541 ref->name = malloc(namelen + 1);
2542 if (!ref->name)
2543 return ERR;
2544
2545 strncpy(ref->name, name, namelen);
2546 ref->name[namelen] = 0;
2547 ref->tag = tag;
2548 string_copy(ref->id, id);
2549
2550 return OK;
2551 }
2552
2553 static int
2554 load_refs(void)
2555 {
2556 const char *cmd_env = getenv("TIG_LS_REMOTE");
2557 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
2558
2559 return read_properties(popen(cmd, "r"), "\t", read_ref);
2560 }
2561
2562 static int
2563 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
2564 {
2565 if (!strcmp(name, "i18n.commitencoding"))
2566 string_copy(opt_encoding, value);
2567
2568 return OK;
2569 }
2570
2571 static int
2572 load_repo_config(void)
2573 {
2574 return read_properties(popen("git repo-config --list", "r"),
2575 "=", read_repo_config_option);
2576 }
2577
2578 static int
2579 read_properties(FILE *pipe, const char *separators,
2580 int (*read_property)(char *, int, char *, int))
2581 {
2582 char buffer[BUFSIZ];
2583 char *name;
2584 int state = OK;
2585
2586 if (!pipe)
2587 return ERR;
2588
2589 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
2590 char *value;
2591 size_t namelen;
2592 size_t valuelen;
2593
2594 name = chomp_string(name);
2595 namelen = strcspn(name, separators);
2596
2597 if (name[namelen]) {
2598 name[namelen] = 0;
2599 value = chomp_string(name + namelen + 1);
2600 valuelen = strlen(value);
2601
2602 } else {
2603 value = "";
2604 valuelen = 0;
2605 }
2606
2607 state = read_property(name, namelen, value, valuelen);
2608 }
2609
2610 if (state != ERR && ferror(pipe))
2611 state = ERR;
2612
2613 pclose(pipe);
2614
2615 return state;
2616 }
2617
2618
2619 /*
2620 * Main
2621 */
2622
2623 static void __NORETURN
2624 quit(int sig)
2625 {
2626 /* XXX: Restore tty modes and let the OS cleanup the rest! */
2627 if (cursed)
2628 endwin();
2629 exit(0);
2630 }
2631
2632 static void __NORETURN
2633 die(const char *err, ...)
2634 {
2635 va_list args;
2636
2637 endwin();
2638
2639 va_start(args, err);
2640 fputs("tig: ", stderr);
2641 vfprintf(stderr, err, args);
2642 fputs("\n", stderr);
2643 va_end(args);
2644
2645 exit(1);
2646 }
2647
2648 int
2649 main(int argc, char *argv[])
2650 {
2651 struct view *view;
2652 enum request request;
2653 size_t i;
2654
2655 signal(SIGINT, quit);
2656
2657 if (load_options() == ERR)
2658 die("Failed to load user config.");
2659
2660 /* Load the repo config file so options can be overwritten from
2661 * the command line. */
2662 if (load_repo_config() == ERR)
2663 die("Failed to load repo config.");
2664
2665 if (!parse_options(argc, argv))
2666 return 0;
2667
2668 if (load_refs() == ERR)
2669 die("Failed to load refs.");
2670
2671 /* Require a git repository unless when running in pager mode. */
2672 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
2673 die("Not a git repository");
2674
2675 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
2676 view->cmd_env = getenv(view->cmd_env);
2677
2678 request = opt_request;
2679
2680 init_display();
2681
2682 while (view_driver(display[current_view], request)) {
2683 int key;
2684 int i;
2685
2686 foreach_view (view, i)
2687 update_view(view);
2688
2689 /* Refresh, accept single keystroke of input */
2690 key = wgetch(status_win);
2691 request = get_request(key);
2692
2693 /* Some low-level request handling. This keeps access to
2694 * status_win restricted. */
2695 switch (request) {
2696 case REQ_PROMPT:
2697 report(":");
2698 /* Temporarily switch to line-oriented and echoed
2699 * input. */
2700 nocbreak();
2701 echo();
2702
2703 if (wgetnstr(status_win, opt_cmd + 4, sizeof(opt_cmd) - 4) == OK) {
2704 memcpy(opt_cmd, "git ", 4);
2705 opt_request = REQ_VIEW_PAGER;
2706 } else {
2707 report("Prompt interrupted by loading view, "
2708 "press 'z' to stop loading views");
2709 request = REQ_SCREEN_UPDATE;
2710 }
2711
2712 noecho();
2713 cbreak();
2714 break;
2715
2716 case REQ_SCREEN_RESIZE:
2717 {
2718 int height, width;
2719
2720 getmaxyx(stdscr, height, width);
2721
2722 /* Resize the status view and let the view driver take
2723 * care of resizing the displayed views. */
2724 wresize(status_win, 1, width);
2725 mvwin(status_win, height - 1, 0);
2726 wrefresh(status_win);
2727 break;
2728 }
2729 default:
2730 break;
2731 }
2732 }
2733
2734 quit(0);
2735
2736 return 0;
2737 }
Full-screen terminal Git browser.