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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-0.4.git"
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 --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 static int
182 string_enum_compare(const char *str1, const char *str2, int len)
183 {
184 size_t i;
185
186 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
187
188 /* Diff-Header == DIFF_HEADER */
189 for (i = 0; i < len; i++) {
190 if (toupper(str1[i]) == toupper(str2[i]))
191 continue;
192
193 if (string_enum_sep(str1[i]) &&
194 string_enum_sep(str2[i]))
195 continue;
196
197 return str1[i] - str2[i];
198 }
199
200 return 0;
201 }
202
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 */
219
220 static size_t
221 sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src)
222 {
223 char c;
224
225 #define BUFPUT(x) do { if (bufsize < SIZEOF_CMD) buf[bufsize++] = (x); } while (0)
226
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('\'');
239
240 return bufsize;
241 }
242
243
244 /*
245 * User requests
246 */
247
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")
288
289
290 /* User action requests. */
291 enum request {
292 #define REQ_GROUP(help)
293 #define REQ_(req, help) REQ_##req
294
295 /* Offset all requests to avoid conflicts with ncurses getch values. */
296 REQ_OFFSET = KEY_MAX + 1,
297 REQ_INFO,
298 REQ_UNKNOWN,
299
300 #undef REQ_GROUP
301 #undef REQ_
302 };
303
304 struct request_info {
305 enum request request;
306 char *name;
307 int namelen;
308 char *help;
309 };
310
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 };
318
319 static enum request
320 get_request(const char *name)
321 {
322 int namelen = strlen(name);
323 int i;
324
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;
329
330 return REQ_UNKNOWN;
331 }
332
333
334 /*
335 * Options
336 */
337
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";
356
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;
367
368 enum option_type {
369 OPT_NONE,
370 OPT_INT,
371 };
372
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;
379
380 if (opt[0] != '-')
381 return FALSE;
382
383 if (opt[1] == '-') {
384 int namelen = strlen(name);
385
386 opt += 2;
387
388 if (strncmp(opt, name, namelen))
389 return FALSE;
390
391 if (opt[namelen] == '=')
392 value = opt + namelen + 1;
393
394 } else {
395 if (!short_name || opt[1] != short_name)
396 return FALSE;
397 value = opt + 2;
398 }
399
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);
407
408 return TRUE;
409 }
410
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;
416
417 for (i = 1; i < argc; i++) {
418 char *opt = argv[i];
419
420 if (!strcmp(opt, "-l")) {
421 opt_request = REQ_VIEW_LOG;
422 continue;
423 }
424
425 if (!strcmp(opt, "-d")) {
426 opt_request = REQ_VIEW_DIFF;
427 continue;
428 }
429
430 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
431 opt_line_number = TRUE;
432 continue;
433 }
434
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 }
439
440 if (check_option(opt, 'v', "version", OPT_NONE)) {
441 printf("tig version %s\n", VERSION);
442 return FALSE;
443 }
444
445 if (check_option(opt, 'h', "help", OPT_NONE)) {
446 printf(usage);
447 return FALSE;
448 }
449
450 if (!strcmp(opt, "--")) {
451 i++;
452 break;
453 }
454
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 }
462
463 if (opt[0] && opt[0] != '-')
464 break;
465
466 die("unknown option '%s'\n\n%s", opt, usage);
467 }
468
469 if (!isatty(STDIN_FILENO)) {
470 opt_request = REQ_VIEW_PAGER;
471 opt_pipe = stdin;
472
473 } else if (i < argc) {
474 size_t buf_size;
475
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);
483
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 }
488
489 if (buf_size >= sizeof(opt_cmd))
490 die("command too long");
491
492 opt_cmd[buf_size] = 0;
493
494 }
495
496 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
497 opt_utf8 = FALSE;
498
499 return TRUE;
500 }
501
502
503 /*
504 * Line-oriented content detection.
505 */
506
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), \
546
547 enum line_type {
548 #define LINE(type, line, fg, bg, attr) \
549 LINE_##type
550 LINE_INFO
551 #undef LINE
552 };
553
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 };
561
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 };
568
569 static enum line_type
570 get_line_type(char *line)
571 {
572 int linelen = strlen(line);
573 enum line_type type;
574
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;
580
581 return LINE_DEFAULT;
582 }
583
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 }
590
591 static struct line_info *
592 get_line_info(char *name, int namelen)
593 {
594 enum line_type type;
595
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];
600
601 return NULL;
602 }
603
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;
610
611 start_color();
612
613 if (use_default_colors() != ERR) {
614 default_bg = -1;
615 default_fg = -1;
616 }
617
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;
622
623 init_pair(type, fg, bg);
624 }
625 }
626
627 struct line {
628 enum line_type type;
629 void *data; /* User data */
630 };
631
632
633 /*
634 * Keys
635 */
636
637 struct keybinding {
638 int alias;
639 enum request request;
640 struct keybinding *next;
641 };
642
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 },
651
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 },
658
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 },
669
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 },
675
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 },
684
685 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
686 { ERR, REQ_SCREEN_UPDATE },
687
688 /* Use the ncurses SIGWINCH handler. */
689 { KEY_RESIZE, REQ_SCREEN_RESIZE },
690 };
691
692 #define KEYMAP_INFO \
693 KEYMAP_(GENERIC), \
694 KEYMAP_(MAIN), \
695 KEYMAP_(DIFF), \
696 KEYMAP_(LOG), \
697 KEYMAP_(PAGER), \
698 KEYMAP_(HELP) \
699
700 enum keymap {
701 #define KEYMAP_(name) KEYMAP_##name
702 KEYMAP_INFO
703 #undef KEYMAP_
704 };
705
706 static struct int_map keymap_table[] = {
707 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
708 KEYMAP_INFO
709 #undef KEYMAP_
710 };
711
712 #define set_keymap(map, name) \
713 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
714
715 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
716
717 static void
718 add_keybinding(enum keymap keymap, enum request request, int key)
719 {
720 struct keybinding *keybinding;
721
722 keybinding = calloc(1, sizeof(*keybinding));
723 if (!keybinding)
724 die("Failed to allocate keybinding");
725
726 keybinding->alias = key;
727 keybinding->request = request;
728 keybinding->next = keybindings[keymap];
729 keybindings[keymap] = keybinding;
730 }
731
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;
739
740 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
741 if (kbd->alias == key)
742 return kbd->request;
743
744 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
745 if (kbd->alias == key)
746 return kbd->request;
747
748 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
749 if (default_keybindings[i].alias == key)
750 return default_keybindings[i].request;
751
752 return (enum request) key;
753 }
754
755
756 struct key {
757 char *name;
758 int value;
759 };
760
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 };
791
792 static int
793 get_key_value(const char *name)
794 {
795 int i;
796
797 for (i = 0; i < ARRAY_SIZE(key_table); i++)
798 if (!strcasecmp(key_table[i].name, name))
799 return key_table[i].value;
800
801 if (strlen(name) == 1 && isprint(*name))
802 return (int) *name;
803
804 return ERR;
805 }
806
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;
815
816 buf[pos] = 0;
817
818 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
819 struct keybinding *keybinding = &default_keybindings[i];
820 char *seq = NULL;
821 int key;
822
823 if (keybinding->request != request)
824 continue;
825
826 for (key = 0; key < ARRAY_SIZE(key_table); key++)
827 if (key_table[key].value == keybinding->alias)
828 seq = key_table[key].name;
829
830 if (seq == NULL &&
831 keybinding->alias < 127 &&
832 isprint(keybinding->alias)) {
833 key_char[1] = (char) keybinding->alias;
834 seq = key_char;
835 }
836
837 if (!seq)
838 seq = "'?'";
839
840 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
841 return "Too many keybindings!";
842 sep = ", ";
843 }
844
845 return buf;
846 }
847
848
849 /*
850 * User config file handling.
851 */
852
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 };
865
866 #define set_color(color, name) \
867 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
868
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 };
879
880 #define set_attribute(attr, name) \
881 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
882
883 static int config_lineno;
884 static bool config_errors;
885 static char *config_msg;
886
887 /* Wants: object fgcolor bgcolor [attr] */
888 static int
889 option_color_command(int argc, char *argv[])
890 {
891 struct line_info *info;
892
893 if (argc != 3 && argc != 4) {
894 config_msg = "Wrong number of arguments given to color command";
895 return ERR;
896 }
897
898 info = get_line_info(argv[0], strlen(argv[0]));
899 if (!info) {
900 config_msg = "Unknown color name";
901 return ERR;
902 }
903
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 }
909
910 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
911 config_msg = "Unknown attribute";
912 return ERR;
913 }
914
915 return OK;
916 }
917
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 }
926
927 if (strcmp(argv[1], "=")) {
928 config_msg = "No value assigned";
929 return ERR;
930 }
931
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 }
938
939 if (!strcmp(argv[0], "line-number-interval")) {
940 opt_num_interval = atoi(argv[2]);
941 return OK;
942 }
943
944 if (!strcmp(argv[0], "tab-size")) {
945 opt_tab_size = atoi(argv[2]);
946 return OK;
947 }
948
949 if (!strcmp(argv[0], "commit-encoding")) {
950 char *arg = argv[2];
951 int delimiter = *arg;
952 int i;
953
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 }
967
968 config_msg = "Unknown variable name";
969 return ERR;
970 }
971
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;
979
980 if (argc != 3) {
981 config_msg = "Wrong number of arguments given to bind command";
982 return ERR;
983 }
984
985 if (set_keymap(&keymap, argv[0]) == ERR) {
986 config_msg = "Unknown key map";
987 return ERR;
988 }
989
990 key = get_key_value(argv[1]);
991 if (key == ERR) {
992 config_msg = "Unknown key";
993 return ERR;
994 }
995
996 request = get_request(argv[2]);
997 if (request == REQ_UNKNOWN) {
998 config_msg = "Unknown request name";
999 return ERR;
1000 }
1001
1002 add_keybinding(keymap, request, key);
1003
1004 return OK;
1005 }
1006
1007 static int
1008 set_option(char *opt, char *value)
1009 {
1010 char *argv[16];
1011 int valuelen;
1012 int argc = 0;
1013
1014 /* Tokenize */
1015 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1016 argv[argc++] = value;
1017
1018 value += valuelen;
1019 if (!*value)
1020 break;
1021
1022 *value++ = 0;
1023 while (isspace(*value))
1024 value++;
1025 }
1026
1027 if (!strcmp(opt, "color"))
1028 return option_color_command(argc, argv);
1029
1030 if (!strcmp(opt, "set"))
1031 return option_set_command(argc, argv);
1032
1033 if (!strcmp(opt, "bind"))
1034 return option_bind_command(argc, argv);
1035
1036 config_msg = "Unknown option command";
1037 return ERR;
1038 }
1039
1040 static int
1041 read_option(char *opt, int optlen, char *value, int valuelen)
1042 {
1043 int status = OK;
1044
1045 config_lineno++;
1046 config_msg = "Internal error";
1047
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;
1053
1054 if (opt[optlen] != 0) {
1055 config_msg = "No option value";
1056 status = ERR;
1057
1058 } else {
1059 /* Look for comment endings in the value. */
1060 int len = strcspn(value, "#");
1061
1062 if (len < valuelen) {
1063 valuelen = len;
1064 value[valuelen] = 0;
1065 }
1066
1067 status = set_option(opt, value);
1068 }
1069
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 }
1075
1076 /* Always keep going if errors are encountered. */
1077 return OK;
1078 }
1079
1080 static int
1081 load_options(void)
1082 {
1083 char *home = getenv("HOME");
1084 char buf[1024];
1085 FILE *file;
1086
1087 config_lineno = 0;
1088 config_errors = FALSE;
1089
1090 if (!home || !string_format(buf, "%s/.tigrc", home))
1091 return ERR;
1092
1093 /* It's ok that the file doesn't exist. */
1094 file = fopen(buf, "r");
1095 if (!file)
1096 return OK;
1097
1098 if (read_properties(file, " \t", read_option) == ERR ||
1099 config_errors == TRUE)
1100 fprintf(stderr, "Errors while loading %s.\n", buf);
1101
1102 return OK;
1103 }
1104
1105
1106 /*
1107 * The viewer
1108 */
1109
1110 struct view;
1111 struct view_ops;
1112
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;
1116
1117 #define foreach_view(view, i) \
1118 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1119
1120 #define displayed_views() (display[1] != NULL ? 2 : 1)
1121
1122 /* Current head and commit ID */
1123 static char ref_commit[SIZEOF_REF] = "HEAD";
1124 static char ref_head[SIZEOF_REF] = "HEAD";
1125
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} */
1131
1132 struct view_ops *ops; /* View operations */
1133
1134 enum keymap keymap; /* What keymap does this view have */
1135
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. */
1139
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 */
1143
1144 /* Navigation */
1145 unsigned long offset; /* Offset of the window top */
1146 unsigned long lineno; /* Current line number */
1147
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;
1151
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. */
1157
1158 /* Loading */
1159 FILE *pipe;
1160 time_t start_time;
1161 };
1162
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 };
1173
1174 static struct view_ops pager_ops;
1175 static struct view_ops main_ops;
1176
1177 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1178 { name, cmd, #env, ref, ops, map}
1179
1180 #define VIEW_(id, name, ops, ref) \
1181 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1182
1183
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 };
1191
1192 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1193
1194
1195 static bool
1196 draw_view_line(struct view *view, unsigned int lineno)
1197 {
1198 if (view->offset + lineno >= view->lines)
1199 return FALSE;
1200
1201 return view->ops->draw(view, &view->line[view->offset + lineno], lineno);
1202 }
1203
1204 static void
1205 redraw_view_from(struct view *view, int lineno)
1206 {
1207 assert(0 <= lineno && lineno < view->height);
1208
1209 for (; lineno < view->height; lineno++) {
1210 if (!draw_view_line(view, lineno))
1211 break;
1212 }
1213
1214 redrawwin(view->win);
1215 wrefresh(view->win);
1216 }
1217
1218 static void
1219 redraw_view(struct view *view)
1220 {
1221 wclear(view->win);
1222 redraw_view_from(view, 0);
1223 }
1224
1225
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));
1233
1234 werase(view->title);
1235 wmove(view->title, 0, 0);
1236
1237 if (*view->ref)
1238 wprintw(view->title, "[%s] %s", view->name, view->ref);
1239 else
1240 wprintw(view->title, "[%s]", view->name);
1241
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;
1247
1248 wprintw(view->title, " - %s %d of %d (%d%%)",
1249 view->ops->type,
1250 view->lineno + 1,
1251 view->lines,
1252 lines);
1253 }
1254
1255 if (view->pipe) {
1256 time_t secs = time(NULL) - view->start_time;
1257
1258 /* Three git seconds are a long time ... */
1259 if (secs > 2)
1260 wprintw(view->title, " %lds", secs);
1261 }
1262
1263 wmove(view->title, 0, view->width - 1);
1264 wrefresh(view->title);
1265 }
1266
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];
1273
1274 /* Setup window dimensions */
1275
1276 getmaxyx(stdscr, base->height, base->width);
1277
1278 /* Make room for the status window. */
1279 base->height -= 1;
1280
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;
1286
1287 /* Make room for the title bar. */
1288 view->height -= 1;
1289 }
1290
1291 /* Make room for the title bar. */
1292 base->height -= 1;
1293
1294 offset = 0;
1295
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);
1301
1302 scrollok(view->win, TRUE);
1303
1304 view->title = newwin(1, 0, offset + view->height, 0);
1305 if (!view->title)
1306 die("Failed to create title window");
1307
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 }
1313
1314 offset += view->height + 1;
1315 }
1316 }
1317
1318 static void
1319 redraw_display(void)
1320 {
1321 struct view *view;
1322 int i;
1323
1324 foreach_view (view, i) {
1325 redraw_view(view);
1326 update_view_title(view);
1327 }
1328 }
1329
1330 static void
1331 update_display_cursor(void)
1332 {
1333 struct view *view = display[current_view];
1334
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 }
1344
1345 /*
1346 * Navigation
1347 */
1348
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;
1355
1356 assert(0 <= view->offset && view->offset < view->lines);
1357 assert(lines);
1358
1359 /* Redraw the whole screen if scrolling is pointless. */
1360 if (view->height < ABS(lines)) {
1361 redraw_view(view);
1362
1363 } else {
1364 int line = lines > 0 ? view->height - lines : 0;
1365 int end = line + ABS(lines);
1366
1367 wscrl(view->win, lines);
1368
1369 for (; line < end; line++) {
1370 if (!draw_view_line(view, line))
1371 break;
1372 }
1373 }
1374
1375 /* Move current line into the view. */
1376 if (view->lineno < view->offset) {
1377 view->lineno = view->offset;
1378 draw_view_line(view, 0);
1379
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 }
1390
1391 assert(view->offset <= view->lineno && view->lineno < view->lines);
1392
1393 if (!redraw)
1394 return;
1395
1396 redrawwin(view->win);
1397 wrefresh(view->win);
1398 report("");
1399 }
1400
1401 /* Scroll frontend */
1402 static void
1403 scroll_view(struct view *view, enum request request)
1404 {
1405 int lines = 1;
1406
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;
1413
1414 if (lines == 0 || view->offset + view->height >= view->lines) {
1415 report("Cannot scroll beyond the last line");
1416 return;
1417 }
1418 break;
1419
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;
1425
1426 if (lines == 0) {
1427 report("Cannot scroll beyond the first line");
1428 return;
1429 }
1430
1431 lines = -lines;
1432 break;
1433
1434 default:
1435 die("request %d not handled in switch", request);
1436 }
1437
1438 do_scroll_view(view, lines, TRUE);
1439 }
1440
1441 /* Cursor moving */
1442 static void
1443 move_view(struct view *view, enum request request, bool redraw)
1444 {
1445 int steps;
1446
1447 switch (request) {
1448 case REQ_MOVE_FIRST_LINE:
1449 steps = -view->lineno;
1450 break;
1451
1452 case REQ_MOVE_LAST_LINE:
1453 steps = view->lines - view->lineno - 1;
1454 break;
1455
1456 case REQ_MOVE_PAGE_UP:
1457 steps = view->height > view->lineno
1458 ? -view->lineno : -view->height;
1459 break;
1460
1461 case REQ_MOVE_PAGE_DOWN:
1462 steps = view->lineno + view->height >= view->lines
1463 ? view->lines - view->lineno - 1 : view->height;
1464 break;
1465
1466 case REQ_MOVE_UP:
1467 steps = -1;
1468 break;
1469
1470 case REQ_MOVE_DOWN:
1471 steps = 1;
1472 break;
1473
1474 default:
1475 die("request %d not handled in switch", request);
1476 }
1477
1478 if (steps <= 0 && view->lineno == 0) {
1479 report("Cannot move beyond the first line");
1480 return;
1481
1482 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1483 report("Cannot move beyond the last line");
1484 return;
1485 }
1486
1487 /* Move the current line */
1488 view->lineno += steps;
1489 assert(0 <= view->lineno && view->lineno < view->lines);
1490
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;
1494
1495 wmove(view->win, prev_lineno, 0);
1496 wclrtoeol(view->win);
1497 draw_view_line(view, prev_lineno);
1498 }
1499
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;
1505
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 }
1514
1515 do_scroll_view(view, steps, redraw);
1516 return;
1517 }
1518
1519 /* Draw the current line */
1520 draw_view_line(view, view->lineno - view->offset);
1521
1522 if (!redraw)
1523 return;
1524
1525 redrawwin(view->win);
1526 wrefresh(view->win);
1527 report("");
1528 }
1529
1530
1531 /*
1532 * Incremental updating
1533 */
1534
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 }
1547
1548 static bool
1549 begin_update(struct view *view)
1550 {
1551 const char *id = view->id;
1552
1553 if (view->pipe)
1554 end_update(view);
1555
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;
1564
1565 if (!string_format(view->cmd, format, id, id, id, id, id))
1566 return FALSE;
1567 }
1568
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 }
1576
1577 if (!view->pipe)
1578 return FALSE;
1579
1580 set_nonblocking_input(TRUE);
1581
1582 view->offset = 0;
1583 view->lines = 0;
1584 view->lineno = 0;
1585 string_copy(view->vid, id);
1586
1587 if (view->line) {
1588 int i;
1589
1590 for (i = 0; i < view->lines; i++)
1591 if (view->line[i].data)
1592 free(view->line[i].data);
1593
1594 free(view->line);
1595 view->line = NULL;
1596 }
1597
1598 view->start_time = time(NULL);
1599
1600 return TRUE;
1601 }
1602
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);
1607
1608 if (!tmp)
1609 return NULL;
1610
1611 view->line = tmp;
1612 view->line_size = line_size;
1613 return view->line;
1614 }
1615
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;
1626
1627 if (!view->pipe)
1628 return TRUE;
1629
1630 /* Only redraw if lines are visible. */
1631 if (view->offset + view->height >= view->lines)
1632 redraw_from = view->lines - view->offset;
1633
1634 if (!realloc_lines(view, view->lines + lines))
1635 goto alloc_error;
1636
1637 while ((line = fgets(buffer, sizeof(buffer), view->pipe))) {
1638 int linelen = strlen(line);
1639
1640 if (linelen)
1641 line[linelen - 1] = 0;
1642
1643 if (!view->ops->read(view, line))
1644 goto alloc_error;
1645
1646 if (lines-- == 1)
1647 break;
1648 }
1649
1650 {
1651 int digits;
1652
1653 lines = view->lines;
1654 for (digits = 0; lines; digits++)
1655 lines /= 10;
1656
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 }
1663
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--;
1670
1671 /* Incrementally draw avoids flickering. */
1672 redraw_view_from(view, redraw_from);
1673 }
1674
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);
1678
1679 if (ferror(view->pipe)) {
1680 report("Failed to read: %s", strerror(errno));
1681 goto end;
1682
1683 } else if (feof(view->pipe)) {
1684 report("");
1685 goto end;
1686 }
1687
1688 return TRUE;
1689
1690 alloc_error:
1691 report("Allocation failure");
1692
1693 end:
1694 end_update(view);
1695 return FALSE;
1696 }
1697
1698
1699 /*
1700 * View opening
1701 */
1702
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;
1708
1709 if (view->lines > 0)
1710 return;
1711
1712 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1713 if (!req_info[i].request)
1714 lines++;
1715
1716 view->line = calloc(lines, sizeof(*view->line));
1717 if (!view->line) {
1718 report("Allocation failure");
1719 return;
1720 }
1721
1722 view->ops->read(view, "Quick reference for tig keybindings:");
1723
1724 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1725 char *key;
1726
1727 if (!req_info[i].request) {
1728 view->ops->read(view, "");
1729 view->ops->read(view, req_info[i].help);
1730 continue;
1731 }
1732
1733 key = get_key(req_info[i].request);
1734 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1735 continue;
1736
1737 view->ops->read(view, buf);
1738 }
1739 }
1740
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 };
1747
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];
1757
1758 if (view == prev && nviews == 1 && !reload) {
1759 report("Already in %s view", view->name);
1760 return;
1761 }
1762
1763 if (view == VIEW(REQ_VIEW_HELP)) {
1764 open_help_view(view);
1765
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 }
1771
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 }
1782
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();
1788
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;
1792
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 }
1797
1798 if (prev && view != prev) {
1799 if (split && !backgrounded) {
1800 /* "Blur" the previous view. */
1801 update_view_title(prev);
1802 }
1803
1804 view->parent = prev;
1805 }
1806
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 }
1816
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 }
1822
1823
1824 /*
1825 * User request switch noodle
1826 */
1827
1828 static int
1829 view_driver(struct view *view, enum request request)
1830 {
1831 int i;
1832
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;
1842
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;
1849
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;
1857
1858 case REQ_NEXT:
1859 case REQ_PREVIOUS:
1860 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
1861
1862 if (view == VIEW(REQ_VIEW_DIFF) &&
1863 view->parent == VIEW(REQ_VIEW_MAIN)) {
1864 bool redraw = display[1] == view;
1865
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 */
1875
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]);
1882
1883 case REQ_VIEW_NEXT:
1884 {
1885 int nviews = displayed_views();
1886 int next_view = (current_view + 1) % nviews;
1887
1888 if (next_view == current_view) {
1889 report("Only one view is displayed");
1890 break;
1891 }
1892
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;
1903
1904 case REQ_TOGGLE_REV_GRAPH:
1905 opt_rev_graph = !opt_rev_graph;
1906 redraw_display();
1907 break;
1908
1909 case REQ_PROMPT:
1910 /* Always reload^Wrerun commands from the prompt. */
1911 open_view(view, opt_request, OPEN_RELOAD);
1912 break;
1913
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;
1922
1923 case REQ_SHOW_VERSION:
1924 report("%s (built %s)", VERSION, __DATE__);
1925 return TRUE;
1926
1927 case REQ_SCREEN_RESIZE:
1928 resize_display();
1929 /* Fall-through */
1930 case REQ_SCREEN_REDRAW:
1931 redraw_display();
1932 break;
1933
1934 case REQ_SCREEN_UPDATE:
1935 doupdate();
1936 return TRUE;
1937
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;
1955
1956 default:
1957 /* An unknown key will show most commonly used commands. */
1958 report("Unknown key, press 'h' for help");
1959 return TRUE;
1960 }
1961
1962 return TRUE;
1963 }
1964
1965
1966 /*
1967 * Pager backend
1968 */
1969
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;
1977
1978 wmove(view->win, lineno, 0);
1979
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 }
1985
1986 type = LINE_CURSOR;
1987 wchgat(view->win, -1, 0, type, NULL);
1988 }
1989
1990 attr = get_line_attr(type);
1991 wattrset(view->win, attr);
1992
1993 if (opt_line_number || opt_tab_size < TABSIZE) {
1994 static char spaces[] = " ";
1995 int col_offset = 0, col = 0;
1996
1997 if (opt_line_number) {
1998 unsigned long real_lineno = view->offset + lineno + 1;
1999
2000 if (real_lineno == 1 ||
2001 (real_lineno % opt_num_interval) == 0) {
2002 wprintw(view->win, "%.*d", view->digits, real_lineno);
2003
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 }
2011
2012 while (text && col_offset + col < view->width) {
2013 int cols_max = view->width - col_offset - col;
2014 char *pos = text;
2015 int cols;
2016
2017 if (*text == '\t') {
2018 text++;
2019 assert(sizeof(spaces) > TABSIZE);
2020 pos = spaces;
2021 cols = opt_tab_size - (col % opt_tab_size);
2022
2023 } else {
2024 text = strchr(text, '\t');
2025 cols = line ? text - pos : strlen(pos);
2026 }
2027
2028 waddnstr(view->win, pos, MIN(cols, cols_max));
2029 col += cols;
2030 }
2031
2032 } else {
2033 int col = 0, pos = 0;
2034
2035 for (; pos < textlen && col < view->width; pos++, col++)
2036 if (text[pos] == '\t')
2037 col += TABSIZE - (col % TABSIZE) - 1;
2038
2039 waddnstr(view->win, text, pos);
2040 }
2041
2042 return TRUE;
2043 }
2044
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: ";
2053
2054 assert(line->type == LINE_COMMIT);
2055
2056 refs = get_refs(data + STRING_SIZE("commit "));
2057 if (!refs)
2058 return;
2059
2060 do {
2061 struct ref *ref = refs[refpos];
2062 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2063
2064 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2065 return;
2066 sep = ", ";
2067 } while (refs[refpos++]->next);
2068
2069 if (!realloc_lines(view, view->line_size + 1))
2070 return;
2071
2072 line = &view->line[view->lines];
2073 line->data = strdup(buf);
2074 if (!line->data)
2075 return;
2076
2077 line->type = LINE_PP_REFS;
2078 view->lines++;
2079 }
2080
2081 static bool
2082 pager_read(struct view *view, char *data)
2083 {
2084 struct line *line = &view->line[view->lines];
2085
2086 line->data = strdup(data);
2087 if (!line->data)
2088 return FALSE;
2089
2090 line->type = get_line_type(line->data);
2091 view->lines++;
2092
2093 if (line->type == LINE_COMMIT &&
2094 (view == VIEW(REQ_VIEW_DIFF) ||
2095 view == VIEW(REQ_VIEW_LOG)))
2096 add_pager_refs(view, line);
2097
2098 return TRUE;
2099 }
2100
2101 static bool
2102 pager_enter(struct view *view, struct line *line)
2103 {
2104 int split = 0;
2105
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 }
2112
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);
2117
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);
2123
2124 return TRUE;
2125 }
2126
2127 static struct view_ops pager_ops = {
2128 "line",
2129 pager_draw,
2130 pager_read,
2131 pager_enter,
2132 };
2133
2134
2135 /*
2136 * Main view backend
2137 */
2138
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 };
2148
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;
2159
2160 if (!*commit->author)
2161 return FALSE;
2162
2163 wmove(view->win, lineno, col);
2164
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);
2171
2172 } else {
2173 type = LINE_MAIN_COMMIT;
2174 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2175 }
2176
2177 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2178 waddnstr(view->win, buf, timelen);
2179 waddstr(view->win, " ");
2180
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));
2185
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 }
2195
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 }
2204
2205 col += AUTHOR_COLS;
2206 if (type != LINE_CURSOR)
2207 wattrset(view->win, A_NORMAL);
2208
2209 if (opt_rev_graph && commit->graph_size) {
2210 size_t i;
2211
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]);
2217
2218 col += commit->graph_size + 1;
2219 }
2220
2221 wmove(view->win, lineno, col);
2222
2223 if (commit->refs) {
2224 size_t i = 0;
2225
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 }
2242
2243 if (type != LINE_CURSOR)
2244 wattrset(view->win, get_line_attr(type));
2245
2246 {
2247 int titlelen = strlen(commit->title);
2248
2249 if (col + titlelen > view->width)
2250 titlelen = view->width - col;
2251
2252 waddnstr(view->win, commit->title, titlelen);
2253 }
2254
2255 return TRUE;
2256 }
2257
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;
2265
2266 switch (type) {
2267 case LINE_COMMIT:
2268 commit = calloc(1, sizeof(struct commit));
2269 if (!commit)
2270 return FALSE;
2271
2272 line += STRING_SIZE("commit ");
2273
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;
2279
2280 case LINE_AUTHOR:
2281 {
2282 char *ident = line + STRING_SIZE("author ");
2283 char *end = strchr(ident, '<');
2284
2285 if (!commit)
2286 break;
2287
2288 if (end) {
2289 for (; end > ident && isspace(end[-1]); end--) ;
2290 *end = 0;
2291 }
2292
2293 string_copy(commit->author, ident);
2294
2295 /* Parse epoch and timezone */
2296 if (end) {
2297 char *secs = strchr(end + 1, '>');
2298 char *zone;
2299 time_t time;
2300
2301 if (!secs || secs[1] != ' ')
2302 break;
2303
2304 secs += 2;
2305 time = (time_t) atol(secs);
2306 zone = strchr(secs, ' ');
2307 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2308 long tz;
2309
2310 zone++;
2311 tz = ('0' - zone[1]) * 60 * 60 * 10;
2312 tz += ('0' - zone[2]) * 60 * 60;
2313 tz += ('0' - zone[3]) * 60;
2314 tz += ('0' - zone[4]) * 60;
2315
2316 if (zone[0] == '-')
2317 tz = -tz;
2318
2319 time -= tz;
2320 }
2321 gmtime_r(&time, &commit->time);
2322 }
2323 break;
2324 }
2325 default:
2326 if (!commit)
2327 break;
2328
2329 /* Fill in the commit title if it has not already been set. */
2330 if (commit->title[0])
2331 break;
2332
2333 /* Require titles to start with a non-space character at the
2334 * offset used by git log. */
2335 /* FIXME: More gracefull handling of titles; append "..." to
2336 * shortened titles, etc. */
2337 if (strncmp(line, " ", 4) ||
2338 isspace(line[4]))
2339 break;
2340
2341 string_copy(commit->title, line + 4);
2342 }
2343
2344 return TRUE;
2345 }
2346
2347 static bool
2348 main_enter(struct view *view, struct line *line)
2349 {
2350 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2351
2352 open_view(view, REQ_VIEW_DIFF, flags);
2353 return TRUE;
2354 }
2355
2356 static struct view_ops main_ops = {
2357 "commit",
2358 main_draw,
2359 main_read,
2360 main_enter,
2361 };
2362
2363
2364 /*
2365 * Unicode / UTF-8 handling
2366 *
2367 * NOTE: Much of the following code for dealing with unicode is derived from
2368 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2369 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2370 */
2371
2372 /* I've (over)annotated a lot of code snippets because I am not entirely
2373 * confident that the approach taken by this small UTF-8 interface is correct.
2374 * --jonas */
2375
2376 static inline int
2377 unicode_width(unsigned long c)
2378 {
2379 if (c >= 0x1100 &&
2380 (c <= 0x115f /* Hangul Jamo */
2381 || c == 0x2329
2382 || c == 0x232a
2383 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2384 /* CJK ... Yi */
2385 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2386 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2387 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2388 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2389 || (c >= 0xffe0 && c <= 0xffe6)
2390 || (c >= 0x20000 && c <= 0x2fffd)
2391 || (c >= 0x30000 && c <= 0x3fffd)))
2392 return 2;
2393
2394 return 1;
2395 }
2396
2397 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2398 * Illegal bytes are set one. */
2399 static const unsigned char utf8_bytes[256] = {
2400 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,
2401 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,
2402 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,
2403 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,
2404 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,
2405 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,
2406 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,
2407 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,
2408 };
2409
2410 /* Decode UTF-8 multi-byte representation into a unicode character. */
2411 static inline unsigned long
2412 utf8_to_unicode(const char *string, size_t length)
2413 {
2414 unsigned long unicode;
2415
2416 switch (length) {
2417 case 1:
2418 unicode = string[0];
2419 break;
2420 case 2:
2421 unicode = (string[0] & 0x1f) << 6;
2422 unicode += (string[1] & 0x3f);
2423 break;
2424 case 3:
2425 unicode = (string[0] & 0x0f) << 12;
2426 unicode += ((string[1] & 0x3f) << 6);
2427 unicode += (string[2] & 0x3f);
2428 break;
2429 case 4:
2430 unicode = (string[0] & 0x0f) << 18;
2431 unicode += ((string[1] & 0x3f) << 12);
2432 unicode += ((string[2] & 0x3f) << 6);
2433 unicode += (string[3] & 0x3f);
2434 break;
2435 case 5:
2436 unicode = (string[0] & 0x0f) << 24;
2437 unicode += ((string[1] & 0x3f) << 18);
2438 unicode += ((string[2] & 0x3f) << 12);
2439 unicode += ((string[3] & 0x3f) << 6);
2440 unicode += (string[4] & 0x3f);
2441 break;
2442 case 6:
2443 unicode = (string[0] & 0x01) << 30;
2444 unicode += ((string[1] & 0x3f) << 24);
2445 unicode += ((string[2] & 0x3f) << 18);
2446 unicode += ((string[3] & 0x3f) << 12);
2447 unicode += ((string[4] & 0x3f) << 6);
2448 unicode += (string[5] & 0x3f);
2449 break;
2450 default:
2451 die("Invalid unicode length");
2452 }
2453
2454 /* Invalid characters could return the special 0xfffd value but NUL
2455 * should be just as good. */
2456 return unicode > 0xffff ? 0 : unicode;
2457 }
2458
2459 /* Calculates how much of string can be shown within the given maximum width
2460 * and sets trimmed parameter to non-zero value if all of string could not be
2461 * shown.
2462 *
2463 * Additionally, adds to coloffset how many many columns to move to align with
2464 * the expected position. Takes into account how multi-byte and double-width
2465 * characters will effect the cursor position.
2466 *
2467 * Returns the number of bytes to output from string to satisfy max_width. */
2468 static size_t
2469 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
2470 {
2471 const char *start = string;
2472 const char *end = strchr(string, '\0');
2473 size_t mbwidth = 0;
2474 size_t width = 0;
2475
2476 *trimmed = 0;
2477
2478 while (string < end) {
2479 int c = *(unsigned char *) string;
2480 unsigned char bytes = utf8_bytes[c];
2481 size_t ucwidth;
2482 unsigned long unicode;
2483
2484 if (string + bytes > end)
2485 break;
2486
2487 /* Change representation to figure out whether
2488 * it is a single- or double-width character. */
2489
2490 unicode = utf8_to_unicode(string, bytes);
2491 /* FIXME: Graceful handling of invalid unicode character. */
2492 if (!unicode)
2493 break;
2494
2495 ucwidth = unicode_width(unicode);
2496 width += ucwidth;
2497 if (width > max_width) {
2498 *trimmed = 1;
2499 break;
2500 }
2501
2502 /* The column offset collects the differences between the
2503 * number of bytes encoding a character and the number of
2504 * columns will be used for rendering said character.
2505 *
2506 * So if some character A is encoded in 2 bytes, but will be
2507 * represented on the screen using only 1 byte this will and up
2508 * adding 1 to the multi-byte column offset.
2509 *
2510 * Assumes that no double-width character can be encoding in
2511 * less than two bytes. */
2512 if (bytes > ucwidth)
2513 mbwidth += bytes - ucwidth;
2514
2515 string += bytes;
2516 }
2517
2518 *coloffset += mbwidth;
2519
2520 return string - start;
2521 }
2522
2523
2524 /*
2525 * Status management
2526 */
2527
2528 /* Whether or not the curses interface has been initialized. */
2529 static bool cursed = FALSE;
2530
2531 /* The status window is used for polling keystrokes. */
2532 static WINDOW *status_win;
2533
2534 /* Update status and title window. */
2535 static void
2536 report(const char *msg, ...)
2537 {
2538 static bool empty = TRUE;
2539 struct view *view = display[current_view];
2540
2541 if (!empty || *msg) {
2542 va_list args;
2543
2544 va_start(args, msg);
2545
2546 werase(status_win);
2547 wmove(status_win, 0, 0);
2548 if (*msg) {
2549 vwprintw(status_win, msg, args);
2550 empty = FALSE;
2551 } else {
2552 empty = TRUE;
2553 }
2554 wrefresh(status_win);
2555
2556 va_end(args);
2557 }
2558
2559 update_view_title(view);
2560 update_display_cursor();
2561 }
2562
2563 /* Controls when nodelay should be in effect when polling user input. */
2564 static void
2565 set_nonblocking_input(bool loading)
2566 {
2567 static unsigned int loading_views;
2568
2569 if ((loading == FALSE && loading_views-- == 1) ||
2570 (loading == TRUE && loading_views++ == 0))
2571 nodelay(status_win, loading);
2572 }
2573
2574 static void
2575 init_display(void)
2576 {
2577 int x, y;
2578
2579 /* Initialize the curses library */
2580 if (isatty(STDIN_FILENO)) {
2581 cursed = !!initscr();
2582 } else {
2583 /* Leave stdin and stdout alone when acting as a pager. */
2584 FILE *io = fopen("/dev/tty", "r+");
2585
2586 if (!io)
2587 die("Failed to open /dev/tty");
2588 cursed = !!newterm(NULL, io, io);
2589 }
2590
2591 if (!cursed)
2592 die("Failed to initialize curses");
2593
2594 nonl(); /* Tell curses not to do NL->CR/NL on output */
2595 cbreak(); /* Take input chars one at a time, no wait for \n */
2596 noecho(); /* Don't echo input */
2597 leaveok(stdscr, TRUE);
2598
2599 if (has_colors())
2600 init_colors();
2601
2602 getmaxyx(stdscr, y, x);
2603 status_win = newwin(1, 0, y - 1, 0);
2604 if (!status_win)
2605 die("Failed to create status window");
2606
2607 /* Enable keyboard mapping */
2608 keypad(status_win, TRUE);
2609 wbkgdset(status_win, get_line_attr(LINE_STATUS));
2610 }
2611
2612 static int
2613 read_prompt(void)
2614 {
2615 enum { READING, STOP, CANCEL } status = READING;
2616 char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
2617 int pos = 0;
2618
2619 while (status == READING) {
2620 struct view *view;
2621 int i, key;
2622
2623 foreach_view (view, i)
2624 update_view(view);
2625
2626 report(":%.*s", pos, buf);
2627 /* Refresh, accept single keystroke of input */
2628 key = wgetch(status_win);
2629 switch (key) {
2630 case KEY_RETURN:
2631 case KEY_ENTER:
2632 case '\n':
2633 status = pos ? STOP : CANCEL;
2634 break;
2635
2636 case KEY_BACKSPACE:
2637 if (pos > 0)
2638 pos--;
2639 else
2640 status = CANCEL;
2641 break;
2642
2643 case KEY_ESC:
2644 status = CANCEL;
2645 break;
2646
2647 case ERR:
2648 break;
2649
2650 default:
2651 if (pos >= sizeof(buf)) {
2652 report("Input string too long");
2653 return ERR;
2654 }
2655
2656 if (isprint(key))
2657 buf[pos++] = (char) key;
2658 }
2659 }
2660
2661 if (status == CANCEL) {
2662 /* Clear the status window */
2663 report("");
2664 return ERR;
2665 }
2666
2667 buf[pos++] = 0;
2668 if (!string_format(opt_cmd, "git %s", buf))
2669 return ERR;
2670 opt_request = REQ_VIEW_PAGER;
2671
2672 return OK;
2673 }
2674
2675 /*
2676 * Repository references
2677 */
2678
2679 static struct ref *refs;
2680 static size_t refs_size;
2681
2682 /* Id <-> ref store */
2683 static struct ref ***id_refs;
2684 static size_t id_refs_size;
2685
2686 static struct ref **
2687 get_refs(char *id)
2688 {
2689 struct ref ***tmp_id_refs;
2690 struct ref **ref_list = NULL;
2691 size_t ref_list_size = 0;
2692 size_t i;
2693
2694 for (i = 0; i < id_refs_size; i++)
2695 if (!strcmp(id, id_refs[i][0]->id))
2696 return id_refs[i];
2697
2698 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
2699 if (!tmp_id_refs)
2700 return NULL;
2701
2702 id_refs = tmp_id_refs;
2703
2704 for (i = 0; i < refs_size; i++) {
2705 struct ref **tmp;
2706
2707 if (strcmp(id, refs[i].id))
2708 continue;
2709
2710 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
2711 if (!tmp) {
2712 if (ref_list)
2713 free(ref_list);
2714 return NULL;
2715 }
2716
2717 ref_list = tmp;
2718 if (ref_list_size > 0)
2719 ref_list[ref_list_size - 1]->next = 1;
2720 ref_list[ref_list_size] = &refs[i];
2721
2722 /* XXX: The properties of the commit chains ensures that we can
2723 * safely modify the shared ref. The repo references will
2724 * always be similar for the same id. */
2725 ref_list[ref_list_size]->next = 0;
2726 ref_list_size++;
2727 }
2728
2729 if (ref_list)
2730 id_refs[id_refs_size++] = ref_list;
2731
2732 return ref_list;
2733 }
2734
2735 static int
2736 read_ref(char *id, int idlen, char *name, int namelen)
2737 {
2738 struct ref *ref;
2739 bool tag = FALSE;
2740
2741 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
2742 /* Commits referenced by tags has "^{}" appended. */
2743 if (name[namelen - 1] != '}')
2744 return OK;
2745
2746 while (namelen > 0 && name[namelen] != '^')
2747 namelen--;
2748
2749 tag = TRUE;
2750 namelen -= STRING_SIZE("refs/tags/");
2751 name += STRING_SIZE("refs/tags/");
2752
2753 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
2754 namelen -= STRING_SIZE("refs/heads/");
2755 name += STRING_SIZE("refs/heads/");
2756
2757 } else if (!strcmp(name, "HEAD")) {
2758 return OK;
2759 }
2760
2761 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
2762 if (!refs)
2763 return ERR;
2764
2765 ref = &refs[refs_size++];
2766 ref->name = malloc(namelen + 1);
2767 if (!ref->name)
2768 return ERR;
2769
2770 strncpy(ref->name, name, namelen);
2771 ref->name[namelen] = 0;
2772 ref->tag = tag;
2773 string_copy(ref->id, id);
2774
2775 return OK;
2776 }
2777
2778 static int
2779 load_refs(void)
2780 {
2781 const char *cmd_env = getenv("TIG_LS_REMOTE");
2782 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
2783
2784 return read_properties(popen(cmd, "r"), "\t", read_ref);
2785 }
2786
2787 static int
2788 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
2789 {
2790 if (!strcmp(name, "i18n.commitencoding"))
2791 string_copy(opt_encoding, value);
2792
2793 return OK;
2794 }
2795
2796 static int
2797 load_repo_config(void)
2798 {
2799 return read_properties(popen("git repo-config --list", "r"),
2800 "=", read_repo_config_option);
2801 }
2802
2803 static int
2804 read_properties(FILE *pipe, const char *separators,
2805 int (*read_property)(char *, int, char *, int))
2806 {
2807 char buffer[BUFSIZ];
2808 char *name;
2809 int state = OK;
2810
2811 if (!pipe)
2812 return ERR;
2813
2814 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
2815 char *value;
2816 size_t namelen;
2817 size_t valuelen;
2818
2819 name = chomp_string(name);
2820 namelen = strcspn(name, separators);
2821
2822 if (name[namelen]) {
2823 name[namelen] = 0;
2824 value = chomp_string(name + namelen + 1);
2825 valuelen = strlen(value);
2826
2827 } else {
2828 value = "";
2829 valuelen = 0;
2830 }
2831
2832 state = read_property(name, namelen, value, valuelen);
2833 }
2834
2835 if (state != ERR && ferror(pipe))
2836 state = ERR;
2837
2838 pclose(pipe);
2839
2840 return state;
2841 }
2842
2843
2844 /*
2845 * Main
2846 */
2847
2848 static void __NORETURN
2849 quit(int sig)
2850 {
2851 /* XXX: Restore tty modes and let the OS cleanup the rest! */
2852 if (cursed)
2853 endwin();
2854 exit(0);
2855 }
2856
2857 static void __NORETURN
2858 die(const char *err, ...)
2859 {
2860 va_list args;
2861
2862 endwin();
2863
2864 va_start(args, err);
2865 fputs("tig: ", stderr);
2866 vfprintf(stderr, err, args);
2867 fputs("\n", stderr);
2868 va_end(args);
2869
2870 exit(1);
2871 }
2872
2873 int
2874 main(int argc, char *argv[])
2875 {
2876 struct view *view;
2877 enum request request;
2878 size_t i;
2879
2880 signal(SIGINT, quit);
2881
2882 if (load_options() == ERR)
2883 die("Failed to load user config.");
2884
2885 /* Load the repo config file so options can be overwritten from
2886 * the command line. */
2887 if (load_repo_config() == ERR)
2888 die("Failed to load repo config.");
2889
2890 if (!parse_options(argc, argv))
2891 return 0;
2892
2893 if (load_refs() == ERR)
2894 die("Failed to load refs.");
2895
2896 /* Require a git repository unless when running in pager mode. */
2897 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
2898 die("Not a git repository");
2899
2900 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
2901 view->cmd_env = getenv(view->cmd_env);
2902
2903 request = opt_request;
2904
2905 init_display();
2906
2907 while (view_driver(display[current_view], request)) {
2908 int key;
2909 int i;
2910
2911 foreach_view (view, i)
2912 update_view(view);
2913
2914 /* Refresh, accept single keystroke of input */
2915 key = wgetch(status_win);
2916
2917 request = get_keybinding(display[current_view]->keymap, key);
2918
2919 /* Some low-level request handling. This keeps access to
2920 * status_win restricted. */
2921 switch (request) {
2922 case REQ_PROMPT:
2923 if (read_prompt() == ERR)
2924 request = REQ_SCREEN_UPDATE;
2925 break;
2926
2927 case REQ_SCREEN_RESIZE:
2928 {
2929 int height, width;
2930
2931 getmaxyx(stdscr, height, width);
2932
2933 /* Resize the status view and let the view driver take
2934 * care of resizing the displayed views. */
2935 wresize(status_win, 1, width);
2936 mvwin(status_win, height - 1, 0);
2937 wrefresh(status_win);
2938 break;
2939 }
2940 default:
2941 break;
2942 }
2943 }
2944
2945 quit(0);
2946
2947 return 0;
2948 }
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