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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 <sys/types.h>
34 #include <regex.h>
35
36 #include <locale.h>
37 #include <langinfo.h>
38 #include <iconv.h>
39
40 #include <curses.h>
41
42 #if __GNUC__ >= 3
43 #define __NORETURN __attribute__((__noreturn__))
44 #else
45 #define __NORETURN
46 #endif
47
48 static void __NORETURN die(const char *err, ...);
49 static void report(const char *msg, ...);
50 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
51 static void set_nonblocking_input(bool loading);
52 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
53
54 #define ABS(x) ((x) >= 0 ? (x) : -(x))
55 #define MIN(x, y) ((x) < (y) ? (x) : (y))
56
57 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
58 #define STRING_SIZE(x) (sizeof(x) - 1)
59
60 #define SIZEOF_STR 1024 /* Default string size. */
61 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
62 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
63
64 /* This color name can be used to refer to the default term colors. */
65 #define COLOR_DEFAULT (-1)
66
67 #define ICONV_NONE ((iconv_t) -1)
68
69 /* The format and size of the date column in the main view. */
70 #define DATE_FORMAT "%Y-%m-%d %H:%M"
71 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
72
73 #define AUTHOR_COLS 20
74
75 /* The default interval between line numbers. */
76 #define NUMBER_INTERVAL 1
77
78 #define TABSIZE 8
79
80 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
81
82 #define TIG_LS_REMOTE \
83 "git ls-remote . 2>/dev/null"
84
85 #define TIG_DIFF_CMD \
86 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
87
88 #define TIG_LOG_CMD \
89 "git log --cc --stat -n100 %s 2>/dev/null"
90
91 #define TIG_MAIN_CMD \
92 "git log --topo-order --pretty=raw %s 2>/dev/null"
93
94 #define TIG_TREE_CMD \
95 "git ls-tree %s %s"
96
97 #define TIG_BLOB_CMD \
98 "git cat-file blob %s"
99
100 /* XXX: Needs to be defined to the empty string. */
101 #define TIG_HELP_CMD ""
102 #define TIG_PAGER_CMD ""
103
104 /* Some ascii-shorthands fitted into the ncurses namespace. */
105 #define KEY_TAB '\t'
106 #define KEY_RETURN '\r'
107 #define KEY_ESC 27
108
109
110 struct ref {
111 char *name; /* Ref name; tag or head names are shortened. */
112 char id[41]; /* Commit SHA1 ID */
113 unsigned int tag:1; /* Is it a tag? */
114 unsigned int next:1; /* For ref lists: are there more refs? */
115 };
116
117 static struct ref **get_refs(char *id);
118
119 struct int_map {
120 const char *name;
121 int namelen;
122 int value;
123 };
124
125 static int
126 set_from_int_map(struct int_map *map, size_t map_size,
127 int *value, const char *name, int namelen)
128 {
129
130 int i;
131
132 for (i = 0; i < map_size; i++)
133 if (namelen == map[i].namelen &&
134 !strncasecmp(name, map[i].name, namelen)) {
135 *value = map[i].value;
136 return OK;
137 }
138
139 return ERR;
140 }
141
142
143 /*
144 * String helpers
145 */
146
147 static inline void
148 string_ncopy(char *dst, const char *src, size_t dstlen)
149 {
150 strncpy(dst, src, dstlen - 1);
151 dst[dstlen - 1] = 0;
152
153 }
154
155 /* Shorthand for safely copying into a fixed buffer. */
156 #define string_copy(dst, src) \
157 string_ncopy(dst, src, sizeof(dst))
158
159 static char *
160 chomp_string(char *name)
161 {
162 int namelen;
163
164 while (isspace(*name))
165 name++;
166
167 namelen = strlen(name) - 1;
168 while (namelen > 0 && isspace(name[namelen]))
169 name[namelen--] = 0;
170
171 return name;
172 }
173
174 static bool
175 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
176 {
177 va_list args;
178 size_t pos = bufpos ? *bufpos : 0;
179
180 va_start(args, fmt);
181 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
182 va_end(args);
183
184 if (bufpos)
185 *bufpos = pos;
186
187 return pos >= bufsize ? FALSE : TRUE;
188 }
189
190 #define string_format(buf, fmt, args...) \
191 string_nformat(buf, sizeof(buf), NULL, fmt, args)
192
193 #define string_format_from(buf, from, fmt, args...) \
194 string_nformat(buf, sizeof(buf), from, fmt, args)
195
196 static int
197 string_enum_compare(const char *str1, const char *str2, int len)
198 {
199 size_t i;
200
201 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
202
203 /* Diff-Header == DIFF_HEADER */
204 for (i = 0; i < len; i++) {
205 if (toupper(str1[i]) == toupper(str2[i]))
206 continue;
207
208 if (string_enum_sep(str1[i]) &&
209 string_enum_sep(str2[i]))
210 continue;
211
212 return str1[i] - str2[i];
213 }
214
215 return 0;
216 }
217
218 /* Shell quoting
219 *
220 * NOTE: The following is a slightly modified copy of the git project's shell
221 * quoting routines found in the quote.c file.
222 *
223 * Help to copy the thing properly quoted for the shell safety. any single
224 * quote is replaced with '\'', any exclamation point is replaced with '\!',
225 * and the whole thing is enclosed in a
226 *
227 * E.g.
228 * original sq_quote result
229 * name ==> name ==> 'name'
230 * a b ==> a b ==> 'a b'
231 * a'b ==> a'\''b ==> 'a'\''b'
232 * a!b ==> a'\!'b ==> 'a'\!'b'
233 */
234
235 static size_t
236 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
237 {
238 char c;
239
240 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
241
242 BUFPUT('\'');
243 while ((c = *src++)) {
244 if (c == '\'' || c == '!') {
245 BUFPUT('\'');
246 BUFPUT('\\');
247 BUFPUT(c);
248 BUFPUT('\'');
249 } else {
250 BUFPUT(c);
251 }
252 }
253 BUFPUT('\'');
254
255 return bufsize;
256 }
257
258
259 /*
260 * User requests
261 */
262
263 #define REQ_INFO \
264 /* XXX: Keep the view request first and in sync with views[]. */ \
265 REQ_GROUP("View switching") \
266 REQ_(VIEW_MAIN, "Show main view"), \
267 REQ_(VIEW_DIFF, "Show diff view"), \
268 REQ_(VIEW_LOG, "Show log view"), \
269 REQ_(VIEW_TREE, "Show tree view"), \
270 REQ_(VIEW_BLOB, "Show blob view"), \
271 REQ_(VIEW_HELP, "Show help page"), \
272 REQ_(VIEW_PAGER, "Show pager view"), \
273 \
274 REQ_GROUP("View manipulation") \
275 REQ_(ENTER, "Enter current line and scroll"), \
276 REQ_(NEXT, "Move to next"), \
277 REQ_(PREVIOUS, "Move to previous"), \
278 REQ_(VIEW_NEXT, "Move focus to next view"), \
279 REQ_(VIEW_CLOSE, "Close the current view"), \
280 REQ_(QUIT, "Close all views and quit"), \
281 \
282 REQ_GROUP("Cursor navigation") \
283 REQ_(MOVE_UP, "Move cursor one line up"), \
284 REQ_(MOVE_DOWN, "Move cursor one line down"), \
285 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
286 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
287 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
288 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
289 \
290 REQ_GROUP("Scrolling") \
291 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
292 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
293 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
294 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
295 \
296 REQ_GROUP("Searching") \
297 REQ_(SEARCH, "Search the view"), \
298 REQ_(SEARCH_BACK, "Search backwards in the view"), \
299 REQ_(FIND_NEXT, "Find next search match"), \
300 REQ_(FIND_PREV, "Find previous search match"), \
301 \
302 REQ_GROUP("Misc") \
303 REQ_(NONE, "Do nothing"), \
304 REQ_(PROMPT, "Bring up the prompt"), \
305 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
306 REQ_(SCREEN_RESIZE, "Resize the screen"), \
307 REQ_(SHOW_VERSION, "Show version information"), \
308 REQ_(STOP_LOADING, "Stop all loading views"), \
309 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
310 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
311
312
313 /* User action requests. */
314 enum request {
315 #define REQ_GROUP(help)
316 #define REQ_(req, help) REQ_##req
317
318 /* Offset all requests to avoid conflicts with ncurses getch values. */
319 REQ_OFFSET = KEY_MAX + 1,
320 REQ_INFO,
321 REQ_UNKNOWN,
322
323 #undef REQ_GROUP
324 #undef REQ_
325 };
326
327 struct request_info {
328 enum request request;
329 char *name;
330 int namelen;
331 char *help;
332 };
333
334 static struct request_info req_info[] = {
335 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
336 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
337 REQ_INFO
338 #undef REQ_GROUP
339 #undef REQ_
340 };
341
342 static enum request
343 get_request(const char *name)
344 {
345 int namelen = strlen(name);
346 int i;
347
348 for (i = 0; i < ARRAY_SIZE(req_info); i++)
349 if (req_info[i].namelen == namelen &&
350 !string_enum_compare(req_info[i].name, name, namelen))
351 return req_info[i].request;
352
353 return REQ_UNKNOWN;
354 }
355
356
357 /*
358 * Options
359 */
360
361 static const char usage[] =
362 VERSION " (" __DATE__ ")\n"
363 "\n"
364 "Usage: tig [options]\n"
365 " or: tig [options] [--] [git log options]\n"
366 " or: tig [options] log [git log options]\n"
367 " or: tig [options] diff [git diff options]\n"
368 " or: tig [options] show [git show options]\n"
369 " or: tig [options] < [git command output]\n"
370 "\n"
371 "Options:\n"
372 " -l Start up in log view\n"
373 " -d Start up in diff view\n"
374 " -n[I], --line-number[=I] Show line numbers with given interval\n"
375 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
376 " -- Mark end of tig options\n"
377 " -v, --version Show version and exit\n"
378 " -h, --help Show help message and exit\n";
379
380 /* Option and state variables. */
381 static bool opt_line_number = FALSE;
382 static bool opt_rev_graph = TRUE;
383 static int opt_num_interval = NUMBER_INTERVAL;
384 static int opt_tab_size = TABSIZE;
385 static enum request opt_request = REQ_VIEW_MAIN;
386 static char opt_cmd[SIZEOF_STR] = "";
387 static char opt_path[SIZEOF_STR] = "";
388 static FILE *opt_pipe = NULL;
389 static char opt_encoding[20] = "UTF-8";
390 static bool opt_utf8 = TRUE;
391 static char opt_codeset[20] = "UTF-8";
392 static iconv_t opt_iconv = ICONV_NONE;
393 static char opt_search[SIZEOF_STR] = "";
394
395 enum option_type {
396 OPT_NONE,
397 OPT_INT,
398 };
399
400 static bool
401 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
402 {
403 va_list args;
404 char *value = "";
405 int *number;
406
407 if (opt[0] != '-')
408 return FALSE;
409
410 if (opt[1] == '-') {
411 int namelen = strlen(name);
412
413 opt += 2;
414
415 if (strncmp(opt, name, namelen))
416 return FALSE;
417
418 if (opt[namelen] == '=')
419 value = opt + namelen + 1;
420
421 } else {
422 if (!short_name || opt[1] != short_name)
423 return FALSE;
424 value = opt + 2;
425 }
426
427 va_start(args, type);
428 if (type == OPT_INT) {
429 number = va_arg(args, int *);
430 if (isdigit(*value))
431 *number = atoi(value);
432 }
433 va_end(args);
434
435 return TRUE;
436 }
437
438 /* Returns the index of log or diff command or -1 to exit. */
439 static bool
440 parse_options(int argc, char *argv[])
441 {
442 int i;
443
444 for (i = 1; i < argc; i++) {
445 char *opt = argv[i];
446
447 if (!strcmp(opt, "-l")) {
448 opt_request = REQ_VIEW_LOG;
449 continue;
450 }
451
452 if (!strcmp(opt, "-d")) {
453 opt_request = REQ_VIEW_DIFF;
454 continue;
455 }
456
457 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
458 opt_line_number = TRUE;
459 continue;
460 }
461
462 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
463 opt_tab_size = MIN(opt_tab_size, TABSIZE);
464 continue;
465 }
466
467 if (check_option(opt, 'v', "version", OPT_NONE)) {
468 printf("tig version %s\n", VERSION);
469 return FALSE;
470 }
471
472 if (check_option(opt, 'h', "help", OPT_NONE)) {
473 printf(usage);
474 return FALSE;
475 }
476
477 if (!strcmp(opt, "--")) {
478 i++;
479 break;
480 }
481
482 if (!strcmp(opt, "log") ||
483 !strcmp(opt, "diff") ||
484 !strcmp(opt, "show")) {
485 opt_request = opt[0] == 'l'
486 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
487 break;
488 }
489
490 if (opt[0] && opt[0] != '-')
491 break;
492
493 die("unknown option '%s'\n\n%s", opt, usage);
494 }
495
496 if (!isatty(STDIN_FILENO)) {
497 opt_request = REQ_VIEW_PAGER;
498 opt_pipe = stdin;
499
500 } else if (i < argc) {
501 size_t buf_size;
502
503 if (opt_request == REQ_VIEW_MAIN)
504 /* XXX: This is vulnerable to the user overriding
505 * options required for the main view parser. */
506 string_copy(opt_cmd, "git log --stat --pretty=raw");
507 else
508 string_copy(opt_cmd, "git");
509 buf_size = strlen(opt_cmd);
510
511 while (buf_size < sizeof(opt_cmd) && i < argc) {
512 opt_cmd[buf_size++] = ' ';
513 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
514 }
515
516 if (buf_size >= sizeof(opt_cmd))
517 die("command too long");
518
519 opt_cmd[buf_size] = 0;
520
521 }
522
523 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
524 opt_utf8 = FALSE;
525
526 return TRUE;
527 }
528
529
530 /*
531 * Line-oriented content detection.
532 */
533
534 #define LINE_INFO \
535 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
536 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
537 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
538 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
539 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
540 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
541 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
542 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
543 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
544 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
545 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
546 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
547 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
548 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
549 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
550 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
551 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
552 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
553 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
554 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
555 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
556 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
557 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
558 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
559 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
560 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
561 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
562 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
563 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
564 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
565 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
566 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
567 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
568 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
569 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
570 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
571 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
572 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
573 LINE(TREE_DIR, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
574 LINE(TREE_FILE, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL)
575
576 enum line_type {
577 #define LINE(type, line, fg, bg, attr) \
578 LINE_##type
579 LINE_INFO
580 #undef LINE
581 };
582
583 struct line_info {
584 const char *name; /* Option name. */
585 int namelen; /* Size of option name. */
586 const char *line; /* The start of line to match. */
587 int linelen; /* Size of string to match. */
588 int fg, bg, attr; /* Color and text attributes for the lines. */
589 };
590
591 static struct line_info line_info[] = {
592 #define LINE(type, line, fg, bg, attr) \
593 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
594 LINE_INFO
595 #undef LINE
596 };
597
598 static enum line_type
599 get_line_type(char *line)
600 {
601 int linelen = strlen(line);
602 enum line_type type;
603
604 for (type = 0; type < ARRAY_SIZE(line_info); type++)
605 /* Case insensitive search matches Signed-off-by lines better. */
606 if (linelen >= line_info[type].linelen &&
607 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
608 return type;
609
610 return LINE_DEFAULT;
611 }
612
613 static inline int
614 get_line_attr(enum line_type type)
615 {
616 assert(type < ARRAY_SIZE(line_info));
617 return COLOR_PAIR(type) | line_info[type].attr;
618 }
619
620 static struct line_info *
621 get_line_info(char *name, int namelen)
622 {
623 enum line_type type;
624
625 for (type = 0; type < ARRAY_SIZE(line_info); type++)
626 if (namelen == line_info[type].namelen &&
627 !string_enum_compare(line_info[type].name, name, namelen))
628 return &line_info[type];
629
630 return NULL;
631 }
632
633 static void
634 init_colors(void)
635 {
636 int default_bg = COLOR_BLACK;
637 int default_fg = COLOR_WHITE;
638 enum line_type type;
639
640 start_color();
641
642 if (use_default_colors() != ERR) {
643 default_bg = -1;
644 default_fg = -1;
645 }
646
647 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
648 struct line_info *info = &line_info[type];
649 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
650 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
651
652 init_pair(type, fg, bg);
653 }
654 }
655
656 struct line {
657 enum line_type type;
658 void *data; /* User data */
659 };
660
661
662 /*
663 * Keys
664 */
665
666 struct keybinding {
667 int alias;
668 enum request request;
669 struct keybinding *next;
670 };
671
672 static struct keybinding default_keybindings[] = {
673 /* View switching */
674 { 'm', REQ_VIEW_MAIN },
675 { 'd', REQ_VIEW_DIFF },
676 { 'l', REQ_VIEW_LOG },
677 { 't', REQ_VIEW_TREE },
678 { 'b', REQ_VIEW_BLOB },
679 { 'p', REQ_VIEW_PAGER },
680 { 'h', REQ_VIEW_HELP },
681
682 /* View manipulation */
683 { 'q', REQ_VIEW_CLOSE },
684 { KEY_TAB, REQ_VIEW_NEXT },
685 { KEY_RETURN, REQ_ENTER },
686 { KEY_UP, REQ_PREVIOUS },
687 { KEY_DOWN, REQ_NEXT },
688
689 /* Cursor navigation */
690 { 'k', REQ_MOVE_UP },
691 { 'j', REQ_MOVE_DOWN },
692 { KEY_HOME, REQ_MOVE_FIRST_LINE },
693 { KEY_END, REQ_MOVE_LAST_LINE },
694 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
695 { ' ', REQ_MOVE_PAGE_DOWN },
696 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
697 { 'b', REQ_MOVE_PAGE_UP },
698 { '-', REQ_MOVE_PAGE_UP },
699
700 /* Scrolling */
701 { KEY_IC, REQ_SCROLL_LINE_UP },
702 { KEY_DC, REQ_SCROLL_LINE_DOWN },
703 { 'w', REQ_SCROLL_PAGE_UP },
704 { 's', REQ_SCROLL_PAGE_DOWN },
705
706 /* Searching */
707 { '/', REQ_SEARCH },
708 { '?', REQ_SEARCH_BACK },
709 { 'n', REQ_FIND_NEXT },
710 { 'N', REQ_FIND_PREV },
711
712 /* Misc */
713 { 'Q', REQ_QUIT },
714 { 'z', REQ_STOP_LOADING },
715 { 'v', REQ_SHOW_VERSION },
716 { 'r', REQ_SCREEN_REDRAW },
717 { '.', REQ_TOGGLE_LINENO },
718 { 'g', REQ_TOGGLE_REV_GRAPH },
719 { ':', REQ_PROMPT },
720
721 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
722 { ERR, REQ_NONE },
723
724 /* Using the ncurses SIGWINCH handler. */
725 { KEY_RESIZE, REQ_SCREEN_RESIZE },
726 };
727
728 #define KEYMAP_INFO \
729 KEYMAP_(GENERIC), \
730 KEYMAP_(MAIN), \
731 KEYMAP_(DIFF), \
732 KEYMAP_(LOG), \
733 KEYMAP_(TREE), \
734 KEYMAP_(BLOB), \
735 KEYMAP_(PAGER), \
736 KEYMAP_(HELP) \
737
738 enum keymap {
739 #define KEYMAP_(name) KEYMAP_##name
740 KEYMAP_INFO
741 #undef KEYMAP_
742 };
743
744 static struct int_map keymap_table[] = {
745 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
746 KEYMAP_INFO
747 #undef KEYMAP_
748 };
749
750 #define set_keymap(map, name) \
751 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
752
753 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
754
755 static void
756 add_keybinding(enum keymap keymap, enum request request, int key)
757 {
758 struct keybinding *keybinding;
759
760 keybinding = calloc(1, sizeof(*keybinding));
761 if (!keybinding)
762 die("Failed to allocate keybinding");
763
764 keybinding->alias = key;
765 keybinding->request = request;
766 keybinding->next = keybindings[keymap];
767 keybindings[keymap] = keybinding;
768 }
769
770 /* Looks for a key binding first in the given map, then in the generic map, and
771 * lastly in the default keybindings. */
772 static enum request
773 get_keybinding(enum keymap keymap, int key)
774 {
775 struct keybinding *kbd;
776 int i;
777
778 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
779 if (kbd->alias == key)
780 return kbd->request;
781
782 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
783 if (kbd->alias == key)
784 return kbd->request;
785
786 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
787 if (default_keybindings[i].alias == key)
788 return default_keybindings[i].request;
789
790 return (enum request) key;
791 }
792
793
794 struct key {
795 char *name;
796 int value;
797 };
798
799 static struct key key_table[] = {
800 { "Enter", KEY_RETURN },
801 { "Space", ' ' },
802 { "Backspace", KEY_BACKSPACE },
803 { "Tab", KEY_TAB },
804 { "Escape", KEY_ESC },
805 { "Left", KEY_LEFT },
806 { "Right", KEY_RIGHT },
807 { "Up", KEY_UP },
808 { "Down", KEY_DOWN },
809 { "Insert", KEY_IC },
810 { "Delete", KEY_DC },
811 { "Hash", '#' },
812 { "Home", KEY_HOME },
813 { "End", KEY_END },
814 { "PageUp", KEY_PPAGE },
815 { "PageDown", KEY_NPAGE },
816 { "F1", KEY_F(1) },
817 { "F2", KEY_F(2) },
818 { "F3", KEY_F(3) },
819 { "F4", KEY_F(4) },
820 { "F5", KEY_F(5) },
821 { "F6", KEY_F(6) },
822 { "F7", KEY_F(7) },
823 { "F8", KEY_F(8) },
824 { "F9", KEY_F(9) },
825 { "F10", KEY_F(10) },
826 { "F11", KEY_F(11) },
827 { "F12", KEY_F(12) },
828 };
829
830 static int
831 get_key_value(const char *name)
832 {
833 int i;
834
835 for (i = 0; i < ARRAY_SIZE(key_table); i++)
836 if (!strcasecmp(key_table[i].name, name))
837 return key_table[i].value;
838
839 if (strlen(name) == 1 && isprint(*name))
840 return (int) *name;
841
842 return ERR;
843 }
844
845 static char *
846 get_key(enum request request)
847 {
848 static char buf[BUFSIZ];
849 static char key_char[] = "'X'";
850 size_t pos = 0;
851 char *sep = " ";
852 int i;
853
854 buf[pos] = 0;
855
856 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
857 struct keybinding *keybinding = &default_keybindings[i];
858 char *seq = NULL;
859 int key;
860
861 if (keybinding->request != request)
862 continue;
863
864 for (key = 0; key < ARRAY_SIZE(key_table); key++)
865 if (key_table[key].value == keybinding->alias)
866 seq = key_table[key].name;
867
868 if (seq == NULL &&
869 keybinding->alias < 127 &&
870 isprint(keybinding->alias)) {
871 key_char[1] = (char) keybinding->alias;
872 seq = key_char;
873 }
874
875 if (!seq)
876 seq = "'?'";
877
878 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
879 return "Too many keybindings!";
880 sep = ", ";
881 }
882
883 return buf;
884 }
885
886
887 /*
888 * User config file handling.
889 */
890
891 static struct int_map color_map[] = {
892 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
893 COLOR_MAP(DEFAULT),
894 COLOR_MAP(BLACK),
895 COLOR_MAP(BLUE),
896 COLOR_MAP(CYAN),
897 COLOR_MAP(GREEN),
898 COLOR_MAP(MAGENTA),
899 COLOR_MAP(RED),
900 COLOR_MAP(WHITE),
901 COLOR_MAP(YELLOW),
902 };
903
904 #define set_color(color, name) \
905 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
906
907 static struct int_map attr_map[] = {
908 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
909 ATTR_MAP(NORMAL),
910 ATTR_MAP(BLINK),
911 ATTR_MAP(BOLD),
912 ATTR_MAP(DIM),
913 ATTR_MAP(REVERSE),
914 ATTR_MAP(STANDOUT),
915 ATTR_MAP(UNDERLINE),
916 };
917
918 #define set_attribute(attr, name) \
919 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
920
921 static int config_lineno;
922 static bool config_errors;
923 static char *config_msg;
924
925 /* Wants: object fgcolor bgcolor [attr] */
926 static int
927 option_color_command(int argc, char *argv[])
928 {
929 struct line_info *info;
930
931 if (argc != 3 && argc != 4) {
932 config_msg = "Wrong number of arguments given to color command";
933 return ERR;
934 }
935
936 info = get_line_info(argv[0], strlen(argv[0]));
937 if (!info) {
938 config_msg = "Unknown color name";
939 return ERR;
940 }
941
942 if (set_color(&info->fg, argv[1]) == ERR ||
943 set_color(&info->bg, argv[2]) == ERR) {
944 config_msg = "Unknown color";
945 return ERR;
946 }
947
948 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
949 config_msg = "Unknown attribute";
950 return ERR;
951 }
952
953 return OK;
954 }
955
956 /* Wants: name = value */
957 static int
958 option_set_command(int argc, char *argv[])
959 {
960 if (argc != 3) {
961 config_msg = "Wrong number of arguments given to set command";
962 return ERR;
963 }
964
965 if (strcmp(argv[1], "=")) {
966 config_msg = "No value assigned";
967 return ERR;
968 }
969
970 if (!strcmp(argv[0], "show-rev-graph")) {
971 opt_rev_graph = (!strcmp(argv[2], "1") ||
972 !strcmp(argv[2], "true") ||
973 !strcmp(argv[2], "yes"));
974 return OK;
975 }
976
977 if (!strcmp(argv[0], "line-number-interval")) {
978 opt_num_interval = atoi(argv[2]);
979 return OK;
980 }
981
982 if (!strcmp(argv[0], "tab-size")) {
983 opt_tab_size = atoi(argv[2]);
984 return OK;
985 }
986
987 if (!strcmp(argv[0], "commit-encoding")) {
988 char *arg = argv[2];
989 int delimiter = *arg;
990 int i;
991
992 switch (delimiter) {
993 case '"':
994 case '\'':
995 for (arg++, i = 0; arg[i]; i++)
996 if (arg[i] == delimiter) {
997 arg[i] = 0;
998 break;
999 }
1000 default:
1001 string_copy(opt_encoding, arg);
1002 return OK;
1003 }
1004 }
1005
1006 config_msg = "Unknown variable name";
1007 return ERR;
1008 }
1009
1010 /* Wants: mode request key */
1011 static int
1012 option_bind_command(int argc, char *argv[])
1013 {
1014 enum request request;
1015 int keymap;
1016 int key;
1017
1018 if (argc != 3) {
1019 config_msg = "Wrong number of arguments given to bind command";
1020 return ERR;
1021 }
1022
1023 if (set_keymap(&keymap, argv[0]) == ERR) {
1024 config_msg = "Unknown key map";
1025 return ERR;
1026 }
1027
1028 key = get_key_value(argv[1]);
1029 if (key == ERR) {
1030 config_msg = "Unknown key";
1031 return ERR;
1032 }
1033
1034 request = get_request(argv[2]);
1035 if (request == REQ_UNKNOWN) {
1036 config_msg = "Unknown request name";
1037 return ERR;
1038 }
1039
1040 add_keybinding(keymap, request, key);
1041
1042 return OK;
1043 }
1044
1045 static int
1046 set_option(char *opt, char *value)
1047 {
1048 char *argv[16];
1049 int valuelen;
1050 int argc = 0;
1051
1052 /* Tokenize */
1053 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1054 argv[argc++] = value;
1055
1056 value += valuelen;
1057 if (!*value)
1058 break;
1059
1060 *value++ = 0;
1061 while (isspace(*value))
1062 value++;
1063 }
1064
1065 if (!strcmp(opt, "color"))
1066 return option_color_command(argc, argv);
1067
1068 if (!strcmp(opt, "set"))
1069 return option_set_command(argc, argv);
1070
1071 if (!strcmp(opt, "bind"))
1072 return option_bind_command(argc, argv);
1073
1074 config_msg = "Unknown option command";
1075 return ERR;
1076 }
1077
1078 static int
1079 read_option(char *opt, int optlen, char *value, int valuelen)
1080 {
1081 int status = OK;
1082
1083 config_lineno++;
1084 config_msg = "Internal error";
1085
1086 /* Check for comment markers, since read_properties() will
1087 * only ensure opt and value are split at first " \t". */
1088 optlen = strcspn(opt, "#");
1089 if (optlen == 0)
1090 return OK;
1091
1092 if (opt[optlen] != 0) {
1093 config_msg = "No option value";
1094 status = ERR;
1095
1096 } else {
1097 /* Look for comment endings in the value. */
1098 int len = strcspn(value, "#");
1099
1100 if (len < valuelen) {
1101 valuelen = len;
1102 value[valuelen] = 0;
1103 }
1104
1105 status = set_option(opt, value);
1106 }
1107
1108 if (status == ERR) {
1109 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1110 config_lineno, optlen, opt, config_msg);
1111 config_errors = TRUE;
1112 }
1113
1114 /* Always keep going if errors are encountered. */
1115 return OK;
1116 }
1117
1118 static int
1119 load_options(void)
1120 {
1121 char *home = getenv("HOME");
1122 char buf[SIZEOF_STR];
1123 FILE *file;
1124
1125 config_lineno = 0;
1126 config_errors = FALSE;
1127
1128 if (!home || !string_format(buf, "%s/.tigrc", home))
1129 return ERR;
1130
1131 /* It's ok that the file doesn't exist. */
1132 file = fopen(buf, "r");
1133 if (!file)
1134 return OK;
1135
1136 if (read_properties(file, " \t", read_option) == ERR ||
1137 config_errors == TRUE)
1138 fprintf(stderr, "Errors while loading %s.\n", buf);
1139
1140 return OK;
1141 }
1142
1143
1144 /*
1145 * The viewer
1146 */
1147
1148 struct view;
1149 struct view_ops;
1150
1151 /* The display array of active views and the index of the current view. */
1152 static struct view *display[2];
1153 static unsigned int current_view;
1154
1155 #define foreach_displayed_view(view, i) \
1156 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1157
1158 #define displayed_views() (display[1] != NULL ? 2 : 1)
1159
1160 /* Current head and commit ID */
1161 static char ref_blob[SIZEOF_REF] = "";
1162 static char ref_commit[SIZEOF_REF] = "HEAD";
1163 static char ref_head[SIZEOF_REF] = "HEAD";
1164
1165 struct view {
1166 const char *name; /* View name */
1167 const char *cmd_fmt; /* Default command line format */
1168 const char *cmd_env; /* Command line set via environment */
1169 const char *id; /* Points to either of ref_{head,commit,blob} */
1170
1171 struct view_ops *ops; /* View operations */
1172
1173 enum keymap keymap; /* What keymap does this view have */
1174
1175 char cmd[SIZEOF_STR]; /* Command buffer */
1176 char ref[SIZEOF_REF]; /* Hovered commit reference */
1177 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
1178
1179 int height, width; /* The width and height of the main window */
1180 WINDOW *win; /* The main window */
1181 WINDOW *title; /* The title window living below the main window */
1182
1183 /* Navigation */
1184 unsigned long offset; /* Offset of the window top */
1185 unsigned long lineno; /* Current line number */
1186
1187 /* Searching */
1188 char grep[SIZEOF_STR]; /* Search string */
1189 regex_t regex; /* Pre-compiled regex */
1190
1191 /* If non-NULL, points to the view that opened this view. If this view
1192 * is closed tig will switch back to the parent view. */
1193 struct view *parent;
1194
1195 /* Buffering */
1196 unsigned long lines; /* Total number of lines */
1197 struct line *line; /* Line index */
1198 unsigned long line_size;/* Total number of allocated lines */
1199 unsigned int digits; /* Number of digits in the lines member. */
1200
1201 /* Loading */
1202 FILE *pipe;
1203 time_t start_time;
1204 };
1205
1206 struct view_ops {
1207 /* What type of content being displayed. Used in the title bar. */
1208 const char *type;
1209 /* Draw one line; @lineno must be < view->height. */
1210 bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1211 /* Read one line; updates view->line. */
1212 bool (*read)(struct view *view, char *data);
1213 /* Depending on view, change display based on current line. */
1214 bool (*enter)(struct view *view, struct line *line);
1215 /* Search for regex in a line. */
1216 bool (*grep)(struct view *view, struct line *line);
1217 };
1218
1219 static struct view_ops pager_ops;
1220 static struct view_ops main_ops;
1221 static struct view_ops tree_ops;
1222 static struct view_ops blob_ops;
1223
1224 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1225 { name, cmd, #env, ref, ops, map}
1226
1227 #define VIEW_(id, name, ops, ref) \
1228 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1229
1230
1231 static struct view views[] = {
1232 VIEW_(MAIN, "main", &main_ops, ref_head),
1233 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1234 VIEW_(LOG, "log", &pager_ops, ref_head),
1235 VIEW_(TREE, "tree", &tree_ops, ref_commit),
1236 VIEW_(BLOB, "blob", &blob_ops, ref_blob),
1237 VIEW_(HELP, "help", &pager_ops, "static"),
1238 VIEW_(PAGER, "pager", &pager_ops, "static"),
1239 };
1240
1241 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1242
1243 #define foreach_view(view, i) \
1244 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1245
1246 #define view_is_displayed(view) \
1247 (view == display[0] || view == display[1])
1248
1249 static bool
1250 draw_view_line(struct view *view, unsigned int lineno)
1251 {
1252 assert(view_is_displayed(view));
1253
1254 if (view->offset + lineno >= view->lines)
1255 return FALSE;
1256
1257 return view->ops->draw(view, &view->line[view->offset + lineno], lineno);
1258 }
1259
1260 static void
1261 redraw_view_from(struct view *view, int lineno)
1262 {
1263 assert(0 <= lineno && lineno < view->height);
1264
1265 for (; lineno < view->height; lineno++) {
1266 if (!draw_view_line(view, lineno))
1267 break;
1268 }
1269
1270 redrawwin(view->win);
1271 wrefresh(view->win);
1272 }
1273
1274 static void
1275 redraw_view(struct view *view)
1276 {
1277 wclear(view->win);
1278 redraw_view_from(view, 0);
1279 }
1280
1281
1282 static void
1283 update_view_title(struct view *view)
1284 {
1285 assert(view_is_displayed(view));
1286
1287 if (view == display[current_view])
1288 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1289 else
1290 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1291
1292 werase(view->title);
1293 wmove(view->title, 0, 0);
1294
1295 if (*view->ref)
1296 wprintw(view->title, "[%s] %s", view->name, view->ref);
1297 else
1298 wprintw(view->title, "[%s]", view->name);
1299
1300 if (view->lines || view->pipe) {
1301 unsigned int view_lines = view->offset + view->height;
1302 unsigned int lines = view->lines
1303 ? MIN(view_lines, view->lines) * 100 / view->lines
1304 : 0;
1305
1306 wprintw(view->title, " - %s %d of %d (%d%%)",
1307 view->ops->type,
1308 view->lineno + 1,
1309 view->lines,
1310 lines);
1311 }
1312
1313 if (view->pipe) {
1314 time_t secs = time(NULL) - view->start_time;
1315
1316 /* Three git seconds are a long time ... */
1317 if (secs > 2)
1318 wprintw(view->title, " %lds", secs);
1319 }
1320
1321 wmove(view->title, 0, view->width - 1);
1322 wrefresh(view->title);
1323 }
1324
1325 static void
1326 resize_display(void)
1327 {
1328 int offset, i;
1329 struct view *base = display[0];
1330 struct view *view = display[1] ? display[1] : display[0];
1331
1332 /* Setup window dimensions */
1333
1334 getmaxyx(stdscr, base->height, base->width);
1335
1336 /* Make room for the status window. */
1337 base->height -= 1;
1338
1339 if (view != base) {
1340 /* Horizontal split. */
1341 view->width = base->width;
1342 view->height = SCALE_SPLIT_VIEW(base->height);
1343 base->height -= view->height;
1344
1345 /* Make room for the title bar. */
1346 view->height -= 1;
1347 }
1348
1349 /* Make room for the title bar. */
1350 base->height -= 1;
1351
1352 offset = 0;
1353
1354 foreach_displayed_view (view, i) {
1355 if (!view->win) {
1356 view->win = newwin(view->height, 0, offset, 0);
1357 if (!view->win)
1358 die("Failed to create %s view", view->name);
1359
1360 scrollok(view->win, TRUE);
1361
1362 view->title = newwin(1, 0, offset + view->height, 0);
1363 if (!view->title)
1364 die("Failed to create title window");
1365
1366 } else {
1367 wresize(view->win, view->height, view->width);
1368 mvwin(view->win, offset, 0);
1369 mvwin(view->title, offset + view->height, 0);
1370 }
1371
1372 offset += view->height + 1;
1373 }
1374 }
1375
1376 static void
1377 redraw_display(void)
1378 {
1379 struct view *view;
1380 int i;
1381
1382 foreach_displayed_view (view, i) {
1383 redraw_view(view);
1384 update_view_title(view);
1385 }
1386 }
1387
1388 static void
1389 update_display_cursor(void)
1390 {
1391 struct view *view = display[current_view];
1392
1393 /* Move the cursor to the right-most column of the cursor line.
1394 *
1395 * XXX: This could turn out to be a bit expensive, but it ensures that
1396 * the cursor does not jump around. */
1397 if (view->lines) {
1398 wmove(view->win, view->lineno - view->offset, view->width - 1);
1399 wrefresh(view->win);
1400 }
1401 }
1402
1403 /*
1404 * Navigation
1405 */
1406
1407 /* Scrolling backend */
1408 static void
1409 do_scroll_view(struct view *view, int lines, bool redraw)
1410 {
1411 assert(view_is_displayed(view));
1412
1413 /* The rendering expects the new offset. */
1414 view->offset += lines;
1415
1416 assert(0 <= view->offset && view->offset < view->lines);
1417 assert(lines);
1418
1419 /* Redraw the whole screen if scrolling is pointless. */
1420 if (view->height < ABS(lines)) {
1421 redraw_view(view);
1422
1423 } else {
1424 int line = lines > 0 ? view->height - lines : 0;
1425 int end = line + ABS(lines);
1426
1427 wscrl(view->win, lines);
1428
1429 for (; line < end; line++) {
1430 if (!draw_view_line(view, line))
1431 break;
1432 }
1433 }
1434
1435 /* Move current line into the view. */
1436 if (view->lineno < view->offset) {
1437 view->lineno = view->offset;
1438 draw_view_line(view, 0);
1439
1440 } else if (view->lineno >= view->offset + view->height) {
1441 if (view->lineno == view->offset + view->height) {
1442 /* Clear the hidden line so it doesn't show if the view
1443 * is scrolled up. */
1444 wmove(view->win, view->height, 0);
1445 wclrtoeol(view->win);
1446 }
1447 view->lineno = view->offset + view->height - 1;
1448 draw_view_line(view, view->lineno - view->offset);
1449 }
1450
1451 assert(view->offset <= view->lineno && view->lineno < view->lines);
1452
1453 if (!redraw)
1454 return;
1455
1456 redrawwin(view->win);
1457 wrefresh(view->win);
1458 report("");
1459 }
1460
1461 /* Scroll frontend */
1462 static void
1463 scroll_view(struct view *view, enum request request)
1464 {
1465 int lines = 1;
1466
1467 switch (request) {
1468 case REQ_SCROLL_PAGE_DOWN:
1469 lines = view->height;
1470 case REQ_SCROLL_LINE_DOWN:
1471 if (view->offset + lines > view->lines)
1472 lines = view->lines - view->offset;
1473
1474 if (lines == 0 || view->offset + view->height >= view->lines) {
1475 report("Cannot scroll beyond the last line");
1476 return;
1477 }
1478 break;
1479
1480 case REQ_SCROLL_PAGE_UP:
1481 lines = view->height;
1482 case REQ_SCROLL_LINE_UP:
1483 if (lines > view->offset)
1484 lines = view->offset;
1485
1486 if (lines == 0) {
1487 report("Cannot scroll beyond the first line");
1488 return;
1489 }
1490
1491 lines = -lines;
1492 break;
1493
1494 default:
1495 die("request %d not handled in switch", request);
1496 }
1497
1498 do_scroll_view(view, lines, TRUE);
1499 }
1500
1501 /* Cursor moving */
1502 static void
1503 move_view(struct view *view, enum request request, bool redraw)
1504 {
1505 int steps;
1506
1507 switch (request) {
1508 case REQ_MOVE_FIRST_LINE:
1509 steps = -view->lineno;
1510 break;
1511
1512 case REQ_MOVE_LAST_LINE:
1513 steps = view->lines - view->lineno - 1;
1514 break;
1515
1516 case REQ_MOVE_PAGE_UP:
1517 steps = view->height > view->lineno
1518 ? -view->lineno : -view->height;
1519 break;
1520
1521 case REQ_MOVE_PAGE_DOWN:
1522 steps = view->lineno + view->height >= view->lines
1523 ? view->lines - view->lineno - 1 : view->height;
1524 break;
1525
1526 case REQ_MOVE_UP:
1527 steps = -1;
1528 break;
1529
1530 case REQ_MOVE_DOWN:
1531 steps = 1;
1532 break;
1533
1534 default:
1535 die("request %d not handled in switch", request);
1536 }
1537
1538 if (steps <= 0 && view->lineno == 0) {
1539 report("Cannot move beyond the first line");
1540 return;
1541
1542 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1543 report("Cannot move beyond the last line");
1544 return;
1545 }
1546
1547 /* Move the current line */
1548 view->lineno += steps;
1549 assert(0 <= view->lineno && view->lineno < view->lines);
1550
1551 /* Repaint the old "current" line if we be scrolling */
1552 if (ABS(steps) < view->height) {
1553 int prev_lineno = view->lineno - steps - view->offset;
1554
1555 wmove(view->win, prev_lineno, 0);
1556 wclrtoeol(view->win);
1557 draw_view_line(view, prev_lineno);
1558 }
1559
1560 /* Check whether the view needs to be scrolled */
1561 if (view->lineno < view->offset ||
1562 view->lineno >= view->offset + view->height) {
1563 if (steps < 0 && -steps > view->offset) {
1564 steps = -view->offset;
1565
1566 } else if (steps > 0) {
1567 if (view->lineno == view->lines - 1 &&
1568 view->lines > view->height) {
1569 steps = view->lines - view->offset - 1;
1570 if (steps >= view->height)
1571 steps -= view->height - 1;
1572 }
1573 }
1574
1575 do_scroll_view(view, steps, redraw);
1576 return;
1577 }
1578
1579 /* Draw the current line */
1580 draw_view_line(view, view->lineno - view->offset);
1581
1582 if (!redraw)
1583 return;
1584
1585 redrawwin(view->win);
1586 wrefresh(view->win);
1587 report("");
1588 }
1589
1590
1591 /*
1592 * Searching
1593 */
1594
1595 static void search_view(struct view *view, enum request request, const char *search);
1596
1597 static bool
1598 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1599 {
1600 assert(view_is_displayed(view));
1601
1602 if (!view->ops->grep(view, line))
1603 return FALSE;
1604
1605 if (lineno - view->offset >= view->height) {
1606 view->offset = lineno;
1607 view->lineno = lineno;
1608 redraw_view(view);
1609
1610 } else {
1611 unsigned long old_lineno = view->lineno - view->offset;
1612
1613 view->lineno = lineno;
1614
1615 wmove(view->win, old_lineno, 0);
1616 wclrtoeol(view->win);
1617 draw_view_line(view, old_lineno);
1618
1619 draw_view_line(view, view->lineno - view->offset);
1620 redrawwin(view->win);
1621 wrefresh(view->win);
1622 }
1623
1624 report("Line %ld matches '%s'", lineno + 1, view->grep);
1625 return TRUE;
1626 }
1627
1628 static void
1629 find_next(struct view *view, enum request request)
1630 {
1631 unsigned long lineno = view->lineno;
1632 int direction;
1633
1634 if (!*view->grep) {
1635 if (!*opt_search)
1636 report("No previous search");
1637 else
1638 search_view(view, request, opt_search);
1639 return;
1640 }
1641
1642 switch (request) {
1643 case REQ_SEARCH:
1644 case REQ_FIND_NEXT:
1645 direction = 1;
1646 break;
1647
1648 case REQ_SEARCH_BACK:
1649 case REQ_FIND_PREV:
1650 direction = -1;
1651 break;
1652
1653 default:
1654 return;
1655 }
1656
1657 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1658 lineno += direction;
1659
1660 /* Note, lineno is unsigned long so will wrap around in which case it
1661 * will become bigger than view->lines. */
1662 for (; lineno < view->lines; lineno += direction) {
1663 struct line *line = &view->line[lineno];
1664
1665 if (find_next_line(view, lineno, line))
1666 return;
1667 }
1668
1669 report("No match found for '%s'", view->grep);
1670 }
1671
1672 static void
1673 search_view(struct view *view, enum request request, const char *search)
1674 {
1675 int regex_err;
1676
1677 if (*view->grep) {
1678 regfree(&view->regex);
1679 *view->grep = 0;
1680 }
1681
1682 regex_err = regcomp(&view->regex, search, REG_EXTENDED);
1683 if (regex_err != 0) {
1684 char buf[SIZEOF_STR] = "unknown error";
1685
1686 regerror(regex_err, &view->regex, buf, sizeof(buf));
1687 report("Search failed: %s", buf);
1688 return;
1689 }
1690
1691 string_copy(view->grep, search);
1692
1693 find_next(view, request);
1694 }
1695
1696 /*
1697 * Incremental updating
1698 */
1699
1700 static void
1701 end_update(struct view *view)
1702 {
1703 if (!view->pipe)
1704 return;
1705 set_nonblocking_input(FALSE);
1706 if (view->pipe == stdin)
1707 fclose(view->pipe);
1708 else
1709 pclose(view->pipe);
1710 view->pipe = NULL;
1711 }
1712
1713 static bool
1714 begin_update(struct view *view)
1715 {
1716 const char *id = view->id;
1717
1718 if (view->pipe)
1719 end_update(view);
1720
1721 if (opt_cmd[0]) {
1722 string_copy(view->cmd, opt_cmd);
1723 opt_cmd[0] = 0;
1724 /* When running random commands, the view ref could have become
1725 * invalid so clear it. */
1726 view->ref[0] = 0;
1727
1728 } else if (view == VIEW(REQ_VIEW_TREE)) {
1729 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1730
1731 if (strcmp(view->vid, view->id))
1732 opt_path[0] = 0;
1733
1734 if (snprintf(view->cmd, sizeof(view->cmd), format, id, opt_path)
1735 >= sizeof(view->cmd))
1736 return FALSE;
1737
1738 } else {
1739 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1740
1741 if (!string_format(view->cmd, format, id, id, id, id, id))
1742 return FALSE;
1743 }
1744
1745 /* Special case for the pager view. */
1746 if (opt_pipe) {
1747 view->pipe = opt_pipe;
1748 opt_pipe = NULL;
1749 } else {
1750 view->pipe = popen(view->cmd, "r");
1751 }
1752
1753 if (!view->pipe)
1754 return FALSE;
1755
1756 set_nonblocking_input(TRUE);
1757
1758 view->offset = 0;
1759 view->lines = 0;
1760 view->lineno = 0;
1761 string_copy(view->vid, id);
1762
1763 if (view->line) {
1764 int i;
1765
1766 for (i = 0; i < view->lines; i++)
1767 if (view->line[i].data)
1768 free(view->line[i].data);
1769
1770 free(view->line);
1771 view->line = NULL;
1772 }
1773
1774 view->start_time = time(NULL);
1775
1776 return TRUE;
1777 }
1778
1779 static struct line *
1780 realloc_lines(struct view *view, size_t line_size)
1781 {
1782 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1783
1784 if (!tmp)
1785 return NULL;
1786
1787 view->line = tmp;
1788 view->line_size = line_size;
1789 return view->line;
1790 }
1791
1792 static bool
1793 update_view(struct view *view)
1794 {
1795 char in_buffer[BUFSIZ];
1796 char out_buffer[BUFSIZ * 2];
1797 char *line;
1798 /* The number of lines to read. If too low it will cause too much
1799 * redrawing (and possible flickering), if too high responsiveness
1800 * will suffer. */
1801 unsigned long lines = view->height;
1802 int redraw_from = -1;
1803
1804 if (!view->pipe)
1805 return TRUE;
1806
1807 /* Only redraw if lines are visible. */
1808 if (view->offset + view->height >= view->lines)
1809 redraw_from = view->lines - view->offset;
1810
1811 /* FIXME: This is probably not perfect for backgrounded views. */
1812 if (!realloc_lines(view, view->lines + lines))
1813 goto alloc_error;
1814
1815 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1816 size_t linelen = strlen(line);
1817
1818 if (linelen)
1819 line[linelen - 1] = 0;
1820
1821 if (opt_iconv != ICONV_NONE) {
1822 char *inbuf = line;
1823 size_t inlen = linelen;
1824
1825 char *outbuf = out_buffer;
1826 size_t outlen = sizeof(out_buffer);
1827
1828 size_t ret;
1829
1830 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1831 if (ret != (size_t) -1) {
1832 line = out_buffer;
1833 linelen = strlen(out_buffer);
1834 }
1835 }
1836
1837 if (!view->ops->read(view, line))
1838 goto alloc_error;
1839
1840 if (lines-- == 1)
1841 break;
1842 }
1843
1844 {
1845 int digits;
1846
1847 lines = view->lines;
1848 for (digits = 0; lines; digits++)
1849 lines /= 10;
1850
1851 /* Keep the displayed view in sync with line number scaling. */
1852 if (digits != view->digits) {
1853 view->digits = digits;
1854 redraw_from = 0;
1855 }
1856 }
1857
1858 if (!view_is_displayed(view))
1859 goto check_pipe;
1860
1861 if (view == VIEW(REQ_VIEW_TREE)) {
1862 /* Clear the view and redraw everything since the tree sorting
1863 * might have rearranged things. */
1864 redraw_view(view);
1865
1866 } else if (redraw_from >= 0) {
1867 /* If this is an incremental update, redraw the previous line
1868 * since for commits some members could have changed when
1869 * loading the main view. */
1870 if (redraw_from > 0)
1871 redraw_from--;
1872
1873 /* Incrementally draw avoids flickering. */
1874 redraw_view_from(view, redraw_from);
1875 }
1876
1877 /* Update the title _after_ the redraw so that if the redraw picks up a
1878 * commit reference in view->ref it'll be available here. */
1879 update_view_title(view);
1880
1881 check_pipe:
1882 if (ferror(view->pipe)) {
1883 report("Failed to read: %s", strerror(errno));
1884 goto end;
1885
1886 } else if (feof(view->pipe)) {
1887 report("");
1888 goto end;
1889 }
1890
1891 return TRUE;
1892
1893 alloc_error:
1894 report("Allocation failure");
1895
1896 end:
1897 end_update(view);
1898 return FALSE;
1899 }
1900
1901
1902 /*
1903 * View opening
1904 */
1905
1906 static void open_help_view(struct view *view)
1907 {
1908 char buf[BUFSIZ];
1909 int lines = ARRAY_SIZE(req_info) + 2;
1910 int i;
1911
1912 if (view->lines > 0)
1913 return;
1914
1915 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1916 if (!req_info[i].request)
1917 lines++;
1918
1919 view->line = calloc(lines, sizeof(*view->line));
1920 if (!view->line) {
1921 report("Allocation failure");
1922 return;
1923 }
1924
1925 view->ops->read(view, "Quick reference for tig keybindings:");
1926
1927 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1928 char *key;
1929
1930 if (!req_info[i].request) {
1931 view->ops->read(view, "");
1932 view->ops->read(view, req_info[i].help);
1933 continue;
1934 }
1935
1936 key = get_key(req_info[i].request);
1937 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1938 continue;
1939
1940 view->ops->read(view, buf);
1941 }
1942 }
1943
1944 enum open_flags {
1945 OPEN_DEFAULT = 0, /* Use default view switching. */
1946 OPEN_SPLIT = 1, /* Split current view. */
1947 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1948 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1949 };
1950
1951 static void
1952 open_view(struct view *prev, enum request request, enum open_flags flags)
1953 {
1954 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1955 bool split = !!(flags & OPEN_SPLIT);
1956 bool reload = !!(flags & OPEN_RELOAD);
1957 struct view *view = VIEW(request);
1958 int nviews = displayed_views();
1959 struct view *base_view = display[0];
1960
1961 if (view == prev && nviews == 1 && !reload) {
1962 report("Already in %s view", view->name);
1963 return;
1964 }
1965
1966 if (view == VIEW(REQ_VIEW_HELP)) {
1967 open_help_view(view);
1968
1969 } else if ((reload || strcmp(view->vid, view->id)) &&
1970 !begin_update(view)) {
1971 report("Failed to load %s view", view->name);
1972 return;
1973 }
1974
1975 if (split) {
1976 display[1] = view;
1977 if (!backgrounded)
1978 current_view = 1;
1979 } else {
1980 /* Maximize the current view. */
1981 memset(display, 0, sizeof(display));
1982 current_view = 0;
1983 display[current_view] = view;
1984 }
1985
1986 /* Resize the view when switching between split- and full-screen,
1987 * or when switching between two different full-screen views. */
1988 if (nviews != displayed_views() ||
1989 (nviews == 1 && base_view != display[0]))
1990 resize_display();
1991
1992 if (split && prev->lineno - prev->offset >= prev->height) {
1993 /* Take the title line into account. */
1994 int lines = prev->lineno - prev->offset - prev->height + 1;
1995
1996 /* Scroll the view that was split if the current line is
1997 * outside the new limited view. */
1998 do_scroll_view(prev, lines, TRUE);
1999 }
2000
2001 if (prev && view != prev) {
2002 if (split && !backgrounded) {
2003 /* "Blur" the previous view. */
2004 update_view_title(prev);
2005 }
2006
2007 view->parent = prev;
2008 }
2009
2010 if (view->pipe && view->lines == 0) {
2011 /* Clear the old view and let the incremental updating refill
2012 * the screen. */
2013 wclear(view->win);
2014 report("");
2015 } else {
2016 redraw_view(view);
2017 report("");
2018 }
2019
2020 /* If the view is backgrounded the above calls to report()
2021 * won't redraw the view title. */
2022 if (backgrounded)
2023 update_view_title(view);
2024 }
2025
2026
2027 /*
2028 * User request switch noodle
2029 */
2030
2031 static int
2032 view_driver(struct view *view, enum request request)
2033 {
2034 int i;
2035
2036 switch (request) {
2037 case REQ_MOVE_UP:
2038 case REQ_MOVE_DOWN:
2039 case REQ_MOVE_PAGE_UP:
2040 case REQ_MOVE_PAGE_DOWN:
2041 case REQ_MOVE_FIRST_LINE:
2042 case REQ_MOVE_LAST_LINE:
2043 move_view(view, request, TRUE);
2044 break;
2045
2046 case REQ_SCROLL_LINE_DOWN:
2047 case REQ_SCROLL_LINE_UP:
2048 case REQ_SCROLL_PAGE_DOWN:
2049 case REQ_SCROLL_PAGE_UP:
2050 scroll_view(view, request);
2051 break;
2052
2053 case REQ_VIEW_BLOB:
2054 if (!ref_blob[0]) {
2055 report("No file chosen, press 't' to open tree view");
2056 break;
2057 }
2058 /* Fall-through */
2059 case REQ_VIEW_MAIN:
2060 case REQ_VIEW_DIFF:
2061 case REQ_VIEW_LOG:
2062 case REQ_VIEW_TREE:
2063 case REQ_VIEW_HELP:
2064 case REQ_VIEW_PAGER:
2065 open_view(view, request, OPEN_DEFAULT);
2066 break;
2067
2068 case REQ_NEXT:
2069 case REQ_PREVIOUS:
2070 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2071
2072 if ((view == VIEW(REQ_VIEW_DIFF) &&
2073 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2074 (view == VIEW(REQ_VIEW_BLOB) &&
2075 view->parent == VIEW(REQ_VIEW_TREE))) {
2076 bool redraw = display[1] == view;
2077
2078 view = view->parent;
2079 move_view(view, request, redraw);
2080 if (redraw)
2081 update_view_title(view);
2082 } else {
2083 move_view(view, request, TRUE);
2084 break;
2085 }
2086 /* Fall-through */
2087
2088 case REQ_ENTER:
2089 if (!view->lines) {
2090 report("Nothing to enter");
2091 break;
2092 }
2093 return view->ops->enter(view, &view->line[view->lineno]);
2094
2095 case REQ_VIEW_NEXT:
2096 {
2097 int nviews = displayed_views();
2098 int next_view = (current_view + 1) % nviews;
2099
2100 if (next_view == current_view) {
2101 report("Only one view is displayed");
2102 break;
2103 }
2104
2105 current_view = next_view;
2106 /* Blur out the title of the previous view. */
2107 update_view_title(view);
2108 report("");
2109 break;
2110 }
2111 case REQ_TOGGLE_LINENO:
2112 opt_line_number = !opt_line_number;
2113 redraw_display();
2114 break;
2115
2116 case REQ_TOGGLE_REV_GRAPH:
2117 opt_rev_graph = !opt_rev_graph;
2118 redraw_display();
2119 break;
2120
2121 case REQ_PROMPT:
2122 /* Always reload^Wrerun commands from the prompt. */
2123 open_view(view, opt_request, OPEN_RELOAD);
2124 break;
2125
2126 case REQ_SEARCH:
2127 case REQ_SEARCH_BACK:
2128 search_view(view, request, opt_search);
2129 break;
2130
2131 case REQ_FIND_NEXT:
2132 case REQ_FIND_PREV:
2133 find_next(view, request);
2134 break;
2135
2136 case REQ_STOP_LOADING:
2137 for (i = 0; i < ARRAY_SIZE(views); i++) {
2138 view = &views[i];
2139 if (view->pipe)
2140 report("Stopped loading the %s view", view->name),
2141 end_update(view);
2142 }
2143 break;
2144
2145 case REQ_SHOW_VERSION:
2146 report("%s (built %s)", VERSION, __DATE__);
2147 return TRUE;
2148
2149 case REQ_SCREEN_RESIZE:
2150 resize_display();
2151 /* Fall-through */
2152 case REQ_SCREEN_REDRAW:
2153 redraw_display();
2154 break;
2155
2156 case REQ_NONE:
2157 doupdate();
2158 return TRUE;
2159
2160 case REQ_VIEW_CLOSE:
2161 /* XXX: Mark closed views by letting view->parent point to the
2162 * view itself. Parents to closed view should never be
2163 * followed. */
2164 if (view->parent &&
2165 view->parent->parent != view->parent) {
2166 memset(display, 0, sizeof(display));
2167 current_view = 0;
2168 display[current_view] = view->parent;
2169 view->parent = view;
2170 resize_display();
2171 redraw_display();
2172 break;
2173 }
2174 /* Fall-through */
2175 case REQ_QUIT:
2176 return FALSE;
2177
2178 default:
2179 /* An unknown key will show most commonly used commands. */
2180 report("Unknown key, press 'h' for help");
2181 return TRUE;
2182 }
2183
2184 return TRUE;
2185 }
2186
2187
2188 /*
2189 * Pager backend
2190 */
2191
2192 static bool
2193 pager_draw(struct view *view, struct line *line, unsigned int lineno)
2194 {
2195 char *text = line->data;
2196 enum line_type type = line->type;
2197 int textlen = strlen(text);
2198 int attr;
2199
2200 wmove(view->win, lineno, 0);
2201
2202 if (view->offset + lineno == view->lineno) {
2203 if (type == LINE_COMMIT) {
2204 string_copy(view->ref, text + 7);
2205 string_copy(ref_commit, view->ref);
2206
2207 } else if (type == LINE_TREE_DIR || type == LINE_TREE_FILE) {
2208 strncpy(view->ref, text + STRING_SIZE("100644 blob "), 41);
2209 view->ref[40] = 0;
2210 string_copy(ref_blob, view->ref);
2211 }
2212
2213 type = LINE_CURSOR;
2214 wchgat(view->win, -1, 0, type, NULL);
2215 }
2216
2217 attr = get_line_attr(type);
2218 wattrset(view->win, attr);
2219
2220 if (opt_line_number || opt_tab_size < TABSIZE) {
2221 static char spaces[] = " ";
2222 int col_offset = 0, col = 0;
2223
2224 if (opt_line_number) {
2225 unsigned long real_lineno = view->offset + lineno + 1;
2226
2227 if (real_lineno == 1 ||
2228 (real_lineno % opt_num_interval) == 0) {
2229 wprintw(view->win, "%.*d", view->digits, real_lineno);
2230
2231 } else {
2232 waddnstr(view->win, spaces,
2233 MIN(view->digits, STRING_SIZE(spaces)));
2234 }
2235 waddstr(view->win, ": ");
2236 col_offset = view->digits + 2;
2237 }
2238
2239 while (text && col_offset + col < view->width) {
2240 int cols_max = view->width - col_offset - col;
2241 char *pos = text;
2242 int cols;
2243
2244 if (*text == '\t') {
2245 text++;
2246 assert(sizeof(spaces) > TABSIZE);
2247 pos = spaces;
2248 cols = opt_tab_size - (col % opt_tab_size);
2249
2250 } else {
2251 text = strchr(text, '\t');
2252 cols = line ? text - pos : strlen(pos);
2253 }
2254
2255 waddnstr(view->win, pos, MIN(cols, cols_max));
2256 col += cols;
2257 }
2258
2259 } else {
2260 int col = 0, pos = 0;
2261
2262 for (; pos < textlen && col < view->width; pos++, col++)
2263 if (text[pos] == '\t')
2264 col += TABSIZE - (col % TABSIZE) - 1;
2265
2266 waddnstr(view->win, text, pos);
2267 }
2268
2269 return TRUE;
2270 }
2271
2272 static bool
2273 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2274 {
2275 char refbuf[SIZEOF_STR];
2276 char *ref = NULL;
2277 FILE *pipe;
2278
2279 if (!string_format(refbuf, "git describe %s", commit_id))
2280 return TRUE;
2281
2282 pipe = popen(refbuf, "r");
2283 if (!pipe)
2284 return TRUE;
2285
2286 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2287 ref = chomp_string(ref);
2288 pclose(pipe);
2289
2290 if (!ref || !*ref)
2291 return TRUE;
2292
2293 /* This is the only fatal call, since it can "corrupt" the buffer. */
2294 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2295 return FALSE;
2296
2297 return TRUE;
2298 }
2299
2300 static void
2301 add_pager_refs(struct view *view, struct line *line)
2302 {
2303 char buf[SIZEOF_STR];
2304 char *commit_id = line->data + STRING_SIZE("commit ");
2305 struct ref **refs;
2306 size_t bufpos = 0, refpos = 0;
2307 const char *sep = "Refs: ";
2308 bool is_tag = FALSE;
2309
2310 assert(line->type == LINE_COMMIT);
2311
2312 refs = get_refs(commit_id);
2313 if (!refs) {
2314 if (view == VIEW(REQ_VIEW_DIFF))
2315 goto try_add_describe_ref;
2316 return;
2317 }
2318
2319 do {
2320 struct ref *ref = refs[refpos];
2321 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2322
2323 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2324 return;
2325 sep = ", ";
2326 if (ref->tag)
2327 is_tag = TRUE;
2328 } while (refs[refpos++]->next);
2329
2330 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2331 try_add_describe_ref:
2332 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2333 return;
2334 }
2335
2336 if (!realloc_lines(view, view->line_size + 1))
2337 return;
2338
2339 line = &view->line[view->lines];
2340 line->data = strdup(buf);
2341 if (!line->data)
2342 return;
2343
2344 line->type = LINE_PP_REFS;
2345 view->lines++;
2346 }
2347
2348 static bool
2349 pager_read(struct view *view, char *data)
2350 {
2351 struct line *line = &view->line[view->lines];
2352
2353 line->data = strdup(data);
2354 if (!line->data)
2355 return FALSE;
2356
2357 line->type = get_line_type(line->data);
2358 view->lines++;
2359
2360 if (line->type == LINE_COMMIT &&
2361 (view == VIEW(REQ_VIEW_DIFF) ||
2362 view == VIEW(REQ_VIEW_LOG)))
2363 add_pager_refs(view, line);
2364
2365 return TRUE;
2366 }
2367
2368 static bool
2369 pager_enter(struct view *view, struct line *line)
2370 {
2371 int split = 0;
2372
2373 if (line->type == LINE_COMMIT &&
2374 (view == VIEW(REQ_VIEW_LOG) ||
2375 view == VIEW(REQ_VIEW_PAGER))) {
2376 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2377 split = 1;
2378 }
2379
2380 /* Always scroll the view even if it was split. That way
2381 * you can use Enter to scroll through the log view and
2382 * split open each commit diff. */
2383 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2384
2385 /* FIXME: A minor workaround. Scrolling the view will call report("")
2386 * but if we are scrolling a non-current view this won't properly
2387 * update the view title. */
2388 if (split)
2389 update_view_title(view);
2390
2391 return TRUE;
2392 }
2393
2394 static bool
2395 pager_grep(struct view *view, struct line *line)
2396 {
2397 regmatch_t pmatch;
2398 char *text = line->data;
2399
2400 if (!*text)
2401 return FALSE;
2402
2403 if (regexec(&view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2404 return FALSE;
2405
2406 return TRUE;
2407 }
2408
2409 static struct view_ops pager_ops = {
2410 "line",
2411 pager_draw,
2412 pager_read,
2413 pager_enter,
2414 pager_grep,
2415 };
2416
2417
2418 /*
2419 * Tree backend
2420 */
2421
2422 /* Parse output from git ls-tree:
2423 *
2424 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2425 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2426 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2427 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2428 */
2429
2430 #define SIZEOF_TREE_ATTR \
2431 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2432
2433 #define TREE_UP_FORMAT "040000 tree %s\t.."
2434
2435 static int
2436 tree_compare_entry(enum line_type type1, char *name1,
2437 enum line_type type2, char *name2)
2438 {
2439 if (type1 != type2) {
2440 if (type1 == LINE_TREE_DIR)
2441 return -1;
2442 return 1;
2443 }
2444
2445 return strcmp(name1, name2);
2446 }
2447
2448 static bool
2449 tree_read(struct view *view, char *text)
2450 {
2451 size_t textlen = strlen(text);
2452 char buf[SIZEOF_STR];
2453 unsigned long pos;
2454 enum line_type type;
2455 bool first_read = view->lines == 0;
2456
2457 if (textlen <= SIZEOF_TREE_ATTR)
2458 return FALSE;
2459
2460 type = text[STRING_SIZE("100644 ")] == 't'
2461 ? LINE_TREE_DIR : LINE_TREE_FILE;
2462
2463 if (first_read) {
2464 /* Add path info line */
2465 if (snprintf(buf, sizeof(buf), "Directory path /%s", opt_path) < sizeof(buf) &&
2466 realloc_lines(view, view->line_size + 1) &&
2467 pager_read(view, buf))
2468 view->line[view->lines - 1].type = LINE_DEFAULT;
2469 else
2470 return FALSE;
2471
2472 /* Insert "link" to parent directory. */
2473 if (*opt_path &&
2474 snprintf(buf, sizeof(buf), TREE_UP_FORMAT, view->ref) < sizeof(buf) &&
2475 realloc_lines(view, view->line_size + 1) &&
2476 pager_read(view, buf))
2477 view->line[view->lines - 1].type = LINE_TREE_DIR;
2478 else if (*opt_path)
2479 return FALSE;
2480 }
2481
2482 /* Strip the path part ... */
2483 if (*opt_path) {
2484 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2485 size_t striplen = strlen(opt_path);
2486 char *path = text + SIZEOF_TREE_ATTR;
2487
2488 if (pathlen > striplen)
2489 memmove(path, path + striplen,
2490 pathlen - striplen + 1);
2491 }
2492
2493 /* Skip "Directory ..." and ".." line. */
2494 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2495 struct line *line = &view->line[pos];
2496 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2497 char *path2 = text + SIZEOF_TREE_ATTR;
2498 int cmp = tree_compare_entry(line->type, path1, type, path2);
2499
2500 if (cmp <= 0)
2501 continue;
2502
2503 text = strdup(text);
2504 if (!text)
2505 return FALSE;
2506
2507 if (view->lines > pos)
2508 memmove(&view->line[pos + 1], &view->line[pos],
2509 (view->lines - pos) * sizeof(*line));
2510
2511 line = &view->line[pos];
2512 line->data = text;
2513 line->type = type;
2514 view->lines++;
2515 return TRUE;
2516 }
2517
2518 if (!pager_read(view, text))
2519 return FALSE;
2520
2521 /* Move the current line to the first tree entry. */
2522 if (first_read)
2523 view->lineno++;
2524
2525 view->line[view->lines - 1].type = type;
2526 return TRUE;
2527 }
2528
2529 static bool
2530 tree_enter(struct view *view, struct line *line)
2531 {
2532 enum open_flags flags = OPEN_DEFAULT;
2533 char *data = line->data;
2534 enum request request;
2535
2536 switch (line->type) {
2537 case LINE_TREE_DIR:
2538 /* Depending on whether it is a subdir or parent (updir?) link
2539 * mangle the path buffer. */
2540 if (line == &view->line[1] && *opt_path) {
2541 size_t path_len = strlen(opt_path);
2542 char *dirsep = opt_path + path_len - 1;
2543
2544 while (dirsep > opt_path && dirsep[-1] != '/')
2545 dirsep--;
2546
2547 dirsep[0] = 0;
2548
2549 } else {
2550 size_t pathlen = strlen(opt_path);
2551 char *basename = data + SIZEOF_TREE_ATTR;
2552
2553 string_format_from(opt_path, &pathlen, "%s/", basename);
2554 }
2555
2556 /* Trees and subtrees share the same ID, so they are not not
2557 * unique like blobs. */
2558 flags |= OPEN_RELOAD;
2559 request = REQ_VIEW_TREE;
2560 break;
2561
2562 case LINE_TREE_FILE:
2563 /* This causes the blob view to become split, and not having it
2564 * in the tree dir case will make the blob view automatically
2565 * disappear when moving to a different directory. */
2566 flags |= OPEN_SPLIT;
2567 request = REQ_VIEW_BLOB;
2568 break;
2569
2570 default:
2571 return TRUE;
2572 }
2573
2574 open_view(view, request, flags);
2575
2576 if (!VIEW(request)->pipe)
2577 return TRUE;
2578
2579 /* For tree views insert the path to the parent as the first line. */
2580 if (request == REQ_VIEW_BLOB) {
2581 /* Mirror what is showed in the title bar. */
2582 string_ncopy(ref_blob, data + STRING_SIZE("100644 blob "), 40);
2583 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2584 return TRUE;
2585 }
2586
2587 return TRUE;
2588 }
2589
2590 static struct view_ops tree_ops = {
2591 "file",
2592 pager_draw,
2593 tree_read,
2594 tree_enter,
2595 pager_grep,
2596 };
2597
2598 static bool
2599 blob_read(struct view *view, char *line)
2600 {
2601 bool state = pager_read(view, line);
2602
2603 if (state == TRUE)
2604 view->line[view->lines - 1].type = LINE_DEFAULT;
2605
2606 return state;
2607 }
2608
2609 static struct view_ops blob_ops = {
2610 "line",
2611 pager_draw,
2612 blob_read,
2613 pager_enter,
2614 pager_grep,
2615 };
2616
2617
2618 /*
2619 * Main view backend
2620 */
2621
2622 struct commit {
2623 char id[41]; /* SHA1 ID. */
2624 char title[75]; /* First line of the commit message. */
2625 char author[75]; /* Author of the commit. */
2626 struct tm time; /* Date from the author ident. */
2627 struct ref **refs; /* Repository references. */
2628 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2629 size_t graph_size; /* The width of the graph array. */
2630 };
2631
2632 static bool
2633 main_draw(struct view *view, struct line *line, unsigned int lineno)
2634 {
2635 char buf[DATE_COLS + 1];
2636 struct commit *commit = line->data;
2637 enum line_type type;
2638 int col = 0;
2639 size_t timelen;
2640 size_t authorlen;
2641 int trimmed = 1;
2642
2643 if (!*commit->author)
2644 return FALSE;
2645
2646 wmove(view->win, lineno, col);
2647
2648 if (view->offset + lineno == view->lineno) {
2649 string_copy(view->ref, commit->id);
2650 string_copy(ref_commit, view->ref);
2651 type = LINE_CURSOR;
2652 wattrset(view->win, get_line_attr(type));
2653 wchgat(view->win, -1, 0, type, NULL);
2654
2655 } else {
2656 type = LINE_MAIN_COMMIT;
2657 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2658 }
2659
2660 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2661 waddnstr(view->win, buf, timelen);
2662 waddstr(view->win, " ");
2663
2664 col += DATE_COLS;
2665 wmove(view->win, lineno, col);
2666 if (type != LINE_CURSOR)
2667 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2668
2669 if (opt_utf8) {
2670 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2671 } else {
2672 authorlen = strlen(commit->author);
2673 if (authorlen > AUTHOR_COLS - 2) {
2674 authorlen = AUTHOR_COLS - 2;
2675 trimmed = 1;
2676 }
2677 }
2678
2679 if (trimmed) {
2680 waddnstr(view->win, commit->author, authorlen);
2681 if (type != LINE_CURSOR)
2682 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2683 waddch(view->win, '~');
2684 } else {
2685 waddstr(view->win, commit->author);
2686 }
2687
2688 col += AUTHOR_COLS;
2689 if (type != LINE_CURSOR)
2690 wattrset(view->win, A_NORMAL);
2691
2692 if (opt_rev_graph && commit->graph_size) {
2693 size_t i;
2694
2695 wmove(view->win, lineno, col);
2696 /* Using waddch() instead of waddnstr() ensures that
2697 * they'll be rendered correctly for the cursor line. */
2698 for (i = 0; i < commit->graph_size; i++)
2699 waddch(view->win, commit->graph[i]);
2700
2701 col += commit->graph_size + 1;
2702 }
2703
2704 wmove(view->win, lineno, col);
2705
2706 if (commit->refs) {
2707 size_t i = 0;
2708
2709 do {
2710 if (type == LINE_CURSOR)
2711 ;
2712 else if (commit->refs[i]->tag)
2713 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2714 else
2715 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2716 waddstr(view->win, "[");
2717 waddstr(view->win, commit->refs[i]->name);
2718 waddstr(view->win, "]");
2719 if (type != LINE_CURSOR)
2720 wattrset(view->win, A_NORMAL);
2721 waddstr(view->win, " ");
2722 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2723 } while (commit->refs[i++]->next);
2724 }
2725
2726 if (type != LINE_CURSOR)
2727 wattrset(view->win, get_line_attr(type));
2728
2729 {
2730 int titlelen = strlen(commit->title);
2731
2732 if (col + titlelen > view->width)
2733 titlelen = view->width - col;
2734
2735 waddnstr(view->win, commit->title, titlelen);
2736 }
2737
2738 return TRUE;
2739 }
2740
2741 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2742 static bool
2743 main_read(struct view *view, char *line)
2744 {
2745 enum line_type type = get_line_type(line);
2746 struct commit *commit = view->lines
2747 ? view->line[view->lines - 1].data : NULL;
2748
2749 switch (type) {
2750 case LINE_COMMIT:
2751 commit = calloc(1, sizeof(struct commit));
2752 if (!commit)
2753 return FALSE;
2754
2755 line += STRING_SIZE("commit ");
2756
2757 view->line[view->lines++].data = commit;
2758 string_copy(commit->id, line);
2759 commit->refs = get_refs(commit->id);
2760 commit->graph[commit->graph_size++] = ACS_LTEE;
2761 break;
2762
2763 case LINE_AUTHOR:
2764 {
2765 char *ident = line + STRING_SIZE("author ");
2766 char *end = strchr(ident, '<');
2767
2768 if (!commit)
2769 break;
2770
2771 if (end) {
2772 char *email = end + 1;
2773
2774 for (; end > ident && isspace(end[-1]); end--) ;
2775
2776 if (end == ident && *email) {
2777 ident = email;
2778 end = strchr(ident, '>');
2779 for (; end > ident && isspace(end[-1]); end--) ;
2780 }
2781 *end = 0;
2782 }
2783
2784 /* End is NULL or ident meaning there's no author. */
2785 if (end <= ident)
2786 ident = "Unknown";
2787
2788 string_copy(commit->author, ident);
2789
2790 /* Parse epoch and timezone */
2791 if (end) {
2792 char *secs = strchr(end + 1, '>');
2793 char *zone;
2794 time_t time;
2795
2796 if (!secs || secs[1] != ' ')
2797 break;
2798
2799 secs += 2;
2800 time = (time_t) atol(secs);
2801 zone = strchr(secs, ' ');
2802 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2803 long tz;
2804
2805 zone++;
2806 tz = ('0' - zone[1]) * 60 * 60 * 10;
2807 tz += ('0' - zone[2]) * 60 * 60;
2808 tz += ('0' - zone[3]) * 60;
2809 tz += ('0' - zone[4]) * 60;
2810
2811 if (zone[0] == '-')
2812 tz = -tz;
2813
2814 time -= tz;
2815 }
2816 gmtime_r(&time, &commit->time);
2817 }
2818 break;
2819 }
2820 default:
2821 if (!commit)
2822 break;
2823
2824 /* Fill in the commit title if it has not already been set. */
2825 if (commit->title[0])
2826 break;
2827
2828 /* Require titles to start with a non-space character at the
2829 * offset used by git log. */
2830 /* FIXME: More gracefull handling of titles; append "..." to
2831 * shortened titles, etc. */
2832 if (strncmp(line, " ", 4) ||
2833 isspace(line[4]))
2834 break;
2835
2836 string_copy(commit->title, line + 4);
2837 }
2838
2839 return TRUE;
2840 }
2841
2842 static bool
2843 main_enter(struct view *view, struct line *line)
2844 {
2845 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2846
2847 open_view(view, REQ_VIEW_DIFF, flags);
2848 return TRUE;
2849 }
2850
2851 static bool
2852 main_grep(struct view *view, struct line *line)
2853 {
2854 struct commit *commit = line->data;
2855 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
2856 char buf[DATE_COLS + 1];
2857 regmatch_t pmatch;
2858
2859 for (state = S_TITLE; state < S_END; state++) {
2860 char *text;
2861
2862 switch (state) {
2863 case S_TITLE: text = commit->title; break;
2864 case S_AUTHOR: text = commit->author; break;
2865 case S_DATE:
2866 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
2867 continue;
2868 text = buf;
2869 break;
2870
2871 default:
2872 return FALSE;
2873 }
2874
2875 if (regexec(&view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
2876 return TRUE;
2877 }
2878
2879 return FALSE;
2880 }
2881
2882 static struct view_ops main_ops = {
2883 "commit",
2884 main_draw,
2885 main_read,
2886 main_enter,
2887 main_grep,
2888 };
2889
2890
2891 /*
2892 * Unicode / UTF-8 handling
2893 *
2894 * NOTE: Much of the following code for dealing with unicode is derived from
2895 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2896 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2897 */
2898
2899 /* I've (over)annotated a lot of code snippets because I am not entirely
2900 * confident that the approach taken by this small UTF-8 interface is correct.
2901 * --jonas */
2902
2903 static inline int
2904 unicode_width(unsigned long c)
2905 {
2906 if (c >= 0x1100 &&
2907 (c <= 0x115f /* Hangul Jamo */
2908 || c == 0x2329
2909 || c == 0x232a
2910 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2911 /* CJK ... Yi */
2912 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2913 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2914 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2915 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2916 || (c >= 0xffe0 && c <= 0xffe6)
2917 || (c >= 0x20000 && c <= 0x2fffd)
2918 || (c >= 0x30000 && c <= 0x3fffd)))
2919 return 2;
2920
2921 return 1;
2922 }
2923
2924 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2925 * Illegal bytes are set one. */
2926 static const unsigned char utf8_bytes[256] = {
2927 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,
2928 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,
2929 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,
2930 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,
2931 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,
2932 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,
2933 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,
2934 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,
2935 };
2936
2937 /* Decode UTF-8 multi-byte representation into a unicode character. */
2938 static inline unsigned long
2939 utf8_to_unicode(const char *string, size_t length)
2940 {
2941 unsigned long unicode;
2942
2943 switch (length) {
2944 case 1:
2945 unicode = string[0];
2946 break;
2947 case 2:
2948 unicode = (string[0] & 0x1f) << 6;
2949 unicode += (string[1] & 0x3f);
2950 break;
2951 case 3:
2952 unicode = (string[0] & 0x0f) << 12;
2953 unicode += ((string[1] & 0x3f) << 6);
2954 unicode += (string[2] & 0x3f);
2955 break;
2956 case 4:
2957 unicode = (string[0] & 0x0f) << 18;
2958 unicode += ((string[1] & 0x3f) << 12);
2959 unicode += ((string[2] & 0x3f) << 6);
2960 unicode += (string[3] & 0x3f);
2961 break;
2962 case 5:
2963 unicode = (string[0] & 0x0f) << 24;
2964 unicode += ((string[1] & 0x3f) << 18);
2965 unicode += ((string[2] & 0x3f) << 12);
2966 unicode += ((string[3] & 0x3f) << 6);
2967 unicode += (string[4] & 0x3f);
2968 break;
2969 case 6:
2970 unicode = (string[0] & 0x01) << 30;
2971 unicode += ((string[1] & 0x3f) << 24);
2972 unicode += ((string[2] & 0x3f) << 18);
2973 unicode += ((string[3] & 0x3f) << 12);
2974 unicode += ((string[4] & 0x3f) << 6);
2975 unicode += (string[5] & 0x3f);
2976 break;
2977 default:
2978 die("Invalid unicode length");
2979 }
2980
2981 /* Invalid characters could return the special 0xfffd value but NUL
2982 * should be just as good. */
2983 return unicode > 0xffff ? 0 : unicode;
2984 }
2985
2986 /* Calculates how much of string can be shown within the given maximum width
2987 * and sets trimmed parameter to non-zero value if all of string could not be
2988 * shown.
2989 *
2990 * Additionally, adds to coloffset how many many columns to move to align with
2991 * the expected position. Takes into account how multi-byte and double-width
2992 * characters will effect the cursor position.
2993 *
2994 * Returns the number of bytes to output from string to satisfy max_width. */
2995 static size_t
2996 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
2997 {
2998 const char *start = string;
2999 const char *end = strchr(string, '\0');
3000 size_t mbwidth = 0;
3001 size_t width = 0;
3002
3003 *trimmed = 0;
3004
3005 while (string < end) {
3006 int c = *(unsigned char *) string;
3007 unsigned char bytes = utf8_bytes[c];
3008 size_t ucwidth;
3009 unsigned long unicode;
3010
3011 if (string + bytes > end)
3012 break;
3013
3014 /* Change representation to figure out whether
3015 * it is a single- or double-width character. */
3016
3017 unicode = utf8_to_unicode(string, bytes);
3018 /* FIXME: Graceful handling of invalid unicode character. */
3019 if (!unicode)
3020 break;
3021
3022 ucwidth = unicode_width(unicode);
3023 width += ucwidth;
3024 if (width > max_width) {
3025 *trimmed = 1;
3026 break;
3027 }
3028
3029 /* The column offset collects the differences between the
3030 * number of bytes encoding a character and the number of
3031 * columns will be used for rendering said character.
3032 *
3033 * So if some character A is encoded in 2 bytes, but will be
3034 * represented on the screen using only 1 byte this will and up
3035 * adding 1 to the multi-byte column offset.
3036 *
3037 * Assumes that no double-width character can be encoding in
3038 * less than two bytes. */
3039 if (bytes > ucwidth)
3040 mbwidth += bytes - ucwidth;
3041
3042 string += bytes;
3043 }
3044
3045 *coloffset += mbwidth;
3046
3047 return string - start;
3048 }
3049
3050
3051 /*
3052 * Status management
3053 */
3054
3055 /* Whether or not the curses interface has been initialized. */
3056 static bool cursed = FALSE;
3057
3058 /* The status window is used for polling keystrokes. */
3059 static WINDOW *status_win;
3060
3061 /* Update status and title window. */
3062 static void
3063 report(const char *msg, ...)
3064 {
3065 static bool empty = TRUE;
3066 struct view *view = display[current_view];
3067
3068 if (!empty || *msg) {
3069 va_list args;
3070
3071 va_start(args, msg);
3072
3073 werase(status_win);
3074 wmove(status_win, 0, 0);
3075 if (*msg) {
3076 vwprintw(status_win, msg, args);
3077 empty = FALSE;
3078 } else {
3079 empty = TRUE;
3080 }
3081 wrefresh(status_win);
3082
3083 va_end(args);
3084 }
3085
3086 update_view_title(view);
3087 update_display_cursor();
3088 }
3089
3090 /* Controls when nodelay should be in effect when polling user input. */
3091 static void
3092 set_nonblocking_input(bool loading)
3093 {
3094 static unsigned int loading_views;
3095
3096 if ((loading == FALSE && loading_views-- == 1) ||
3097 (loading == TRUE && loading_views++ == 0))
3098 nodelay(status_win, loading);
3099 }
3100
3101 static void
3102 init_display(void)
3103 {
3104 int x, y;
3105
3106 /* Initialize the curses library */
3107 if (isatty(STDIN_FILENO)) {
3108 cursed = !!initscr();
3109 } else {
3110 /* Leave stdin and stdout alone when acting as a pager. */
3111 FILE *io = fopen("/dev/tty", "r+");
3112
3113 if (!io)
3114 die("Failed to open /dev/tty");
3115 cursed = !!newterm(NULL, io, io);
3116 }
3117
3118 if (!cursed)
3119 die("Failed to initialize curses");
3120
3121 nonl(); /* Tell curses not to do NL->CR/NL on output */
3122 cbreak(); /* Take input chars one at a time, no wait for \n */
3123 noecho(); /* Don't echo input */
3124 leaveok(stdscr, TRUE);
3125
3126 if (has_colors())
3127 init_colors();
3128
3129 getmaxyx(stdscr, y, x);
3130 status_win = newwin(1, 0, y - 1, 0);
3131 if (!status_win)
3132 die("Failed to create status window");
3133
3134 /* Enable keyboard mapping */
3135 keypad(status_win, TRUE);
3136 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3137 }
3138
3139 static char *
3140 read_prompt(const char *prompt)
3141 {
3142 enum { READING, STOP, CANCEL } status = READING;
3143 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3144 int pos = 0;
3145
3146 while (status == READING) {
3147 struct view *view;
3148 int i, key;
3149
3150 foreach_view (view, i)
3151 update_view(view);
3152
3153 report("%s%.*s", prompt, pos, buf);
3154 /* Refresh, accept single keystroke of input */
3155 key = wgetch(status_win);
3156 switch (key) {
3157 case KEY_RETURN:
3158 case KEY_ENTER:
3159 case '\n':
3160 status = pos ? STOP : CANCEL;
3161 break;
3162
3163 case KEY_BACKSPACE:
3164 if (pos > 0)
3165 pos--;
3166 else
3167 status = CANCEL;
3168 break;
3169
3170 case KEY_ESC:
3171 status = CANCEL;
3172 break;
3173
3174 case ERR:
3175 break;
3176
3177 default:
3178 if (pos >= sizeof(buf)) {
3179 report("Input string too long");
3180 return NULL;
3181 }
3182
3183 if (isprint(key))
3184 buf[pos++] = (char) key;
3185 }
3186 }
3187
3188 if (status == CANCEL) {
3189 /* Clear the status window */
3190 report("");
3191 return NULL;
3192 }
3193
3194 buf[pos++] = 0;
3195
3196 return buf;
3197 }
3198
3199 /*
3200 * Repository references
3201 */
3202
3203 static struct ref *refs;
3204 static size_t refs_size;
3205
3206 /* Id <-> ref store */
3207 static struct ref ***id_refs;
3208 static size_t id_refs_size;
3209
3210 static struct ref **
3211 get_refs(char *id)
3212 {
3213 struct ref ***tmp_id_refs;
3214 struct ref **ref_list = NULL;
3215 size_t ref_list_size = 0;
3216 size_t i;
3217
3218 for (i = 0; i < id_refs_size; i++)
3219 if (!strcmp(id, id_refs[i][0]->id))
3220 return id_refs[i];
3221
3222 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3223 if (!tmp_id_refs)
3224 return NULL;
3225
3226 id_refs = tmp_id_refs;
3227
3228 for (i = 0; i < refs_size; i++) {
3229 struct ref **tmp;
3230
3231 if (strcmp(id, refs[i].id))
3232 continue;
3233
3234 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3235 if (!tmp) {
3236 if (ref_list)
3237 free(ref_list);
3238 return NULL;
3239 }
3240
3241 ref_list = tmp;
3242 if (ref_list_size > 0)
3243 ref_list[ref_list_size - 1]->next = 1;
3244 ref_list[ref_list_size] = &refs[i];
3245
3246 /* XXX: The properties of the commit chains ensures that we can
3247 * safely modify the shared ref. The repo references will
3248 * always be similar for the same id. */
3249 ref_list[ref_list_size]->next = 0;
3250 ref_list_size++;
3251 }
3252
3253 if (ref_list)
3254 id_refs[id_refs_size++] = ref_list;
3255
3256 return ref_list;
3257 }
3258
3259 static int
3260 read_ref(char *id, int idlen, char *name, int namelen)
3261 {
3262 struct ref *ref;
3263 bool tag = FALSE;
3264
3265 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3266 /* Commits referenced by tags has "^{}" appended. */
3267 if (name[namelen - 1] != '}')
3268 return OK;
3269
3270 while (namelen > 0 && name[namelen] != '^')
3271 namelen--;
3272
3273 tag = TRUE;
3274 namelen -= STRING_SIZE("refs/tags/");
3275 name += STRING_SIZE("refs/tags/");
3276
3277 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3278 namelen -= STRING_SIZE("refs/heads/");
3279 name += STRING_SIZE("refs/heads/");
3280
3281 } else if (!strcmp(name, "HEAD")) {
3282 return OK;
3283 }
3284
3285 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3286 if (!refs)
3287 return ERR;
3288
3289 ref = &refs[refs_size++];
3290 ref->name = malloc(namelen + 1);
3291 if (!ref->name)
3292 return ERR;
3293
3294 strncpy(ref->name, name, namelen);
3295 ref->name[namelen] = 0;
3296 ref->tag = tag;
3297 string_copy(ref->id, id);
3298
3299 return OK;
3300 }
3301
3302 static int
3303 load_refs(void)
3304 {
3305 const char *cmd_env = getenv("TIG_LS_REMOTE");
3306 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3307
3308 return read_properties(popen(cmd, "r"), "\t", read_ref);
3309 }
3310
3311 static int
3312 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3313 {
3314 if (!strcmp(name, "i18n.commitencoding"))
3315 string_copy(opt_encoding, value);
3316
3317 return OK;
3318 }
3319
3320 static int
3321 load_repo_config(void)
3322 {
3323 return read_properties(popen("git repo-config --list", "r"),
3324 "=", read_repo_config_option);
3325 }
3326
3327 static int
3328 read_properties(FILE *pipe, const char *separators,
3329 int (*read_property)(char *, int, char *, int))
3330 {
3331 char buffer[BUFSIZ];
3332 char *name;
3333 int state = OK;
3334
3335 if (!pipe)
3336 return ERR;
3337
3338 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3339 char *value;
3340 size_t namelen;
3341 size_t valuelen;
3342
3343 name = chomp_string(name);
3344 namelen = strcspn(name, separators);
3345
3346 if (name[namelen]) {
3347 name[namelen] = 0;
3348 value = chomp_string(name + namelen + 1);
3349 valuelen = strlen(value);
3350
3351 } else {
3352 value = "";
3353 valuelen = 0;
3354 }
3355
3356 state = read_property(name, namelen, value, valuelen);
3357 }
3358
3359 if (state != ERR && ferror(pipe))
3360 state = ERR;
3361
3362 pclose(pipe);
3363
3364 return state;
3365 }
3366
3367
3368 /*
3369 * Main
3370 */
3371
3372 static void __NORETURN
3373 quit(int sig)
3374 {
3375 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3376 if (cursed)
3377 endwin();
3378 exit(0);
3379 }
3380
3381 static void __NORETURN
3382 die(const char *err, ...)
3383 {
3384 va_list args;
3385
3386 endwin();
3387
3388 va_start(args, err);
3389 fputs("tig: ", stderr);
3390 vfprintf(stderr, err, args);
3391 fputs("\n", stderr);
3392 va_end(args);
3393
3394 exit(1);
3395 }
3396
3397 int
3398 main(int argc, char *argv[])
3399 {
3400 struct view *view;
3401 enum request request;
3402 size_t i;
3403
3404 signal(SIGINT, quit);
3405
3406 if (setlocale(LC_ALL, "")) {
3407 string_copy(opt_codeset, nl_langinfo(CODESET));
3408 }
3409
3410 if (load_options() == ERR)
3411 die("Failed to load user config.");
3412
3413 /* Load the repo config file so options can be overwritten from
3414 * the command line. */
3415 if (load_repo_config() == ERR)
3416 die("Failed to load repo config.");
3417
3418 if (!parse_options(argc, argv))
3419 return 0;
3420
3421 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3422 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3423 if (opt_iconv == ICONV_NONE)
3424 die("Failed to initialize character set conversion");
3425 }
3426
3427 if (load_refs() == ERR)
3428 die("Failed to load refs.");
3429
3430 /* Require a git repository unless when running in pager mode. */
3431 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3432 die("Not a git repository");
3433
3434 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3435 view->cmd_env = getenv(view->cmd_env);
3436
3437 request = opt_request;
3438
3439 init_display();
3440
3441 while (view_driver(display[current_view], request)) {
3442 int key;
3443 int i;
3444
3445 foreach_view (view, i)
3446 update_view(view);
3447
3448 /* Refresh, accept single keystroke of input */
3449 key = wgetch(status_win);
3450
3451 request = get_keybinding(display[current_view]->keymap, key);
3452
3453 /* Some low-level request handling. This keeps access to
3454 * status_win restricted. */
3455 switch (request) {
3456 case REQ_PROMPT:
3457 {
3458 char *cmd = read_prompt(":");
3459
3460 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3461 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3462 opt_request = REQ_VIEW_DIFF;
3463 } else {
3464 opt_request = REQ_VIEW_PAGER;
3465 }
3466 break;
3467 }
3468
3469 request = REQ_NONE;
3470 break;
3471 }
3472 case REQ_SEARCH:
3473 case REQ_SEARCH_BACK:
3474 {
3475 const char *prompt = request == REQ_SEARCH
3476 ? "/" : "?";
3477 char *search = read_prompt(prompt);
3478
3479 if (search)
3480 string_copy(opt_search, search);
3481 else
3482 request = REQ_NONE;
3483 break;
3484 }
3485 case REQ_SCREEN_RESIZE:
3486 {
3487 int height, width;
3488
3489 getmaxyx(stdscr, height, width);
3490
3491 /* Resize the status view and let the view driver take
3492 * care of resizing the displayed views. */
3493 wresize(status_win, 1, width);
3494 mvwin(status_win, height - 1, 0);
3495 wrefresh(status_win);
3496 break;
3497 }
3498 default:
3499 break;
3500 }
3501 }
3502
3503 quit(0);
3504
3505 return 0;
3506 }
Full-screen terminal Git browser.