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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_REV 41 /* Holds a SHA-1 and an ending NUL */
63
64 /* Revision graph */
65
66 #define REVGRAPH_INIT 'I'
67 #define REVGRAPH_MERGE 'M'
68 #define REVGRAPH_BRANCH '+'
69 #define REVGRAPH_COMMIT '*'
70 #define REVGRAPH_LINE '|'
71
72 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
73
74 /* This color name can be used to refer to the default term colors. */
75 #define COLOR_DEFAULT (-1)
76
77 #define ICONV_NONE ((iconv_t) -1)
78
79 /* The format and size of the date column in the main view. */
80 #define DATE_FORMAT "%Y-%m-%d %H:%M"
81 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
82
83 #define AUTHOR_COLS 20
84
85 /* The default interval between line numbers. */
86 #define NUMBER_INTERVAL 1
87
88 #define TABSIZE 8
89
90 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
91
92 #define TIG_LS_REMOTE \
93 "git ls-remote . 2>/dev/null"
94
95 #define TIG_DIFF_CMD \
96 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
97
98 #define TIG_LOG_CMD \
99 "git log --cc --stat -n100 %s 2>/dev/null"
100
101 #define TIG_MAIN_CMD \
102 "git log --topo-order --pretty=raw %s 2>/dev/null"
103
104 #define TIG_TREE_CMD \
105 "git ls-tree %s %s"
106
107 #define TIG_BLOB_CMD \
108 "git cat-file blob %s"
109
110 /* XXX: Needs to be defined to the empty string. */
111 #define TIG_HELP_CMD ""
112 #define TIG_PAGER_CMD ""
113
114 /* Some ascii-shorthands fitted into the ncurses namespace. */
115 #define KEY_TAB '\t'
116 #define KEY_RETURN '\r'
117 #define KEY_ESC 27
118
119
120 struct ref {
121 char *name; /* Ref name; tag or head names are shortened. */
122 char id[SIZEOF_REV]; /* Commit SHA1 ID */
123 unsigned int tag:1; /* Is it a tag? */
124 unsigned int next:1; /* For ref lists: are there more refs? */
125 };
126
127 static struct ref **get_refs(char *id);
128
129 struct int_map {
130 const char *name;
131 int namelen;
132 int value;
133 };
134
135 static int
136 set_from_int_map(struct int_map *map, size_t map_size,
137 int *value, const char *name, int namelen)
138 {
139
140 int i;
141
142 for (i = 0; i < map_size; i++)
143 if (namelen == map[i].namelen &&
144 !strncasecmp(name, map[i].name, namelen)) {
145 *value = map[i].value;
146 return OK;
147 }
148
149 return ERR;
150 }
151
152
153 /*
154 * String helpers
155 */
156
157 static inline void
158 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
159 {
160 if (srclen > dstlen - 1)
161 srclen = dstlen - 1;
162
163 strncpy(dst, src, srclen);
164 dst[srclen] = 0;
165 }
166
167 /* Shorthands for safely copying into a fixed buffer. */
168
169 #define string_copy(dst, src) \
170 string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
171
172 #define string_ncopy(dst, src, srclen) \
173 string_ncopy_do(dst, sizeof(dst), src, srclen)
174
175 static char *
176 chomp_string(char *name)
177 {
178 int namelen;
179
180 while (isspace(*name))
181 name++;
182
183 namelen = strlen(name) - 1;
184 while (namelen > 0 && isspace(name[namelen]))
185 name[namelen--] = 0;
186
187 return name;
188 }
189
190 static bool
191 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
192 {
193 va_list args;
194 size_t pos = bufpos ? *bufpos : 0;
195
196 va_start(args, fmt);
197 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
198 va_end(args);
199
200 if (bufpos)
201 *bufpos = pos;
202
203 return pos >= bufsize ? FALSE : TRUE;
204 }
205
206 #define string_format(buf, fmt, args...) \
207 string_nformat(buf, sizeof(buf), NULL, fmt, args)
208
209 #define string_format_from(buf, from, fmt, args...) \
210 string_nformat(buf, sizeof(buf), from, fmt, args)
211
212 static int
213 string_enum_compare(const char *str1, const char *str2, int len)
214 {
215 size_t i;
216
217 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
218
219 /* Diff-Header == DIFF_HEADER */
220 for (i = 0; i < len; i++) {
221 if (toupper(str1[i]) == toupper(str2[i]))
222 continue;
223
224 if (string_enum_sep(str1[i]) &&
225 string_enum_sep(str2[i]))
226 continue;
227
228 return str1[i] - str2[i];
229 }
230
231 return 0;
232 }
233
234 /* Shell quoting
235 *
236 * NOTE: The following is a slightly modified copy of the git project's shell
237 * quoting routines found in the quote.c file.
238 *
239 * Help to copy the thing properly quoted for the shell safety. any single
240 * quote is replaced with '\'', any exclamation point is replaced with '\!',
241 * and the whole thing is enclosed in a
242 *
243 * E.g.
244 * original sq_quote result
245 * name ==> name ==> 'name'
246 * a b ==> a b ==> 'a b'
247 * a'b ==> a'\''b ==> 'a'\''b'
248 * a!b ==> a'\!'b ==> 'a'\!'b'
249 */
250
251 static size_t
252 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
253 {
254 char c;
255
256 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
257
258 BUFPUT('\'');
259 while ((c = *src++)) {
260 if (c == '\'' || c == '!') {
261 BUFPUT('\'');
262 BUFPUT('\\');
263 BUFPUT(c);
264 BUFPUT('\'');
265 } else {
266 BUFPUT(c);
267 }
268 }
269 BUFPUT('\'');
270
271 return bufsize;
272 }
273
274
275 /*
276 * User requests
277 */
278
279 #define REQ_INFO \
280 /* XXX: Keep the view request first and in sync with views[]. */ \
281 REQ_GROUP("View switching") \
282 REQ_(VIEW_MAIN, "Show main view"), \
283 REQ_(VIEW_DIFF, "Show diff view"), \
284 REQ_(VIEW_LOG, "Show log view"), \
285 REQ_(VIEW_TREE, "Show tree view"), \
286 REQ_(VIEW_BLOB, "Show blob view"), \
287 REQ_(VIEW_HELP, "Show help page"), \
288 REQ_(VIEW_PAGER, "Show pager view"), \
289 \
290 REQ_GROUP("View manipulation") \
291 REQ_(ENTER, "Enter current line and scroll"), \
292 REQ_(NEXT, "Move to next"), \
293 REQ_(PREVIOUS, "Move to previous"), \
294 REQ_(VIEW_NEXT, "Move focus to next view"), \
295 REQ_(VIEW_CLOSE, "Close the current view"), \
296 REQ_(QUIT, "Close all views and quit"), \
297 \
298 REQ_GROUP("Cursor navigation") \
299 REQ_(MOVE_UP, "Move cursor one line up"), \
300 REQ_(MOVE_DOWN, "Move cursor one line down"), \
301 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
302 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
303 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
304 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
305 \
306 REQ_GROUP("Scrolling") \
307 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
308 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
309 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
310 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
311 \
312 REQ_GROUP("Searching") \
313 REQ_(SEARCH, "Search the view"), \
314 REQ_(SEARCH_BACK, "Search backwards in the view"), \
315 REQ_(FIND_NEXT, "Find next search match"), \
316 REQ_(FIND_PREV, "Find previous search match"), \
317 \
318 REQ_GROUP("Misc") \
319 REQ_(NONE, "Do nothing"), \
320 REQ_(PROMPT, "Bring up the prompt"), \
321 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
322 REQ_(SCREEN_RESIZE, "Resize the screen"), \
323 REQ_(SHOW_VERSION, "Show version information"), \
324 REQ_(STOP_LOADING, "Stop all loading views"), \
325 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
326 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
327
328
329 /* User action requests. */
330 enum request {
331 #define REQ_GROUP(help)
332 #define REQ_(req, help) REQ_##req
333
334 /* Offset all requests to avoid conflicts with ncurses getch values. */
335 REQ_OFFSET = KEY_MAX + 1,
336 REQ_INFO,
337 REQ_UNKNOWN,
338
339 #undef REQ_GROUP
340 #undef REQ_
341 };
342
343 struct request_info {
344 enum request request;
345 char *name;
346 int namelen;
347 char *help;
348 };
349
350 static struct request_info req_info[] = {
351 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
352 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
353 REQ_INFO
354 #undef REQ_GROUP
355 #undef REQ_
356 };
357
358 static enum request
359 get_request(const char *name)
360 {
361 int namelen = strlen(name);
362 int i;
363
364 for (i = 0; i < ARRAY_SIZE(req_info); i++)
365 if (req_info[i].namelen == namelen &&
366 !string_enum_compare(req_info[i].name, name, namelen))
367 return req_info[i].request;
368
369 return REQ_UNKNOWN;
370 }
371
372
373 /*
374 * Options
375 */
376
377 static const char usage[] =
378 VERSION " (" __DATE__ ")\n"
379 "\n"
380 "Usage: tig [options]\n"
381 " or: tig [options] [--] [git log options]\n"
382 " or: tig [options] log [git log options]\n"
383 " or: tig [options] diff [git diff options]\n"
384 " or: tig [options] show [git show options]\n"
385 " or: tig [options] < [git command output]\n"
386 "\n"
387 "Options:\n"
388 " -l Start up in log view\n"
389 " -d Start up in diff view\n"
390 " -n[I], --line-number[=I] Show line numbers with given interval\n"
391 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
392 " -- Mark end of tig options\n"
393 " -v, --version Show version and exit\n"
394 " -h, --help Show help message and exit\n";
395
396 /* Option and state variables. */
397 static bool opt_line_number = FALSE;
398 static bool opt_rev_graph = TRUE;
399 static int opt_num_interval = NUMBER_INTERVAL;
400 static int opt_tab_size = TABSIZE;
401 static enum request opt_request = REQ_VIEW_MAIN;
402 static char opt_cmd[SIZEOF_STR] = "";
403 static char opt_path[SIZEOF_STR] = "";
404 static FILE *opt_pipe = NULL;
405 static char opt_encoding[20] = "UTF-8";
406 static bool opt_utf8 = TRUE;
407 static char opt_codeset[20] = "UTF-8";
408 static iconv_t opt_iconv = ICONV_NONE;
409 static char opt_search[SIZEOF_STR] = "";
410
411 enum option_type {
412 OPT_NONE,
413 OPT_INT,
414 };
415
416 static bool
417 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
418 {
419 va_list args;
420 char *value = "";
421 int *number;
422
423 if (opt[0] != '-')
424 return FALSE;
425
426 if (opt[1] == '-') {
427 int namelen = strlen(name);
428
429 opt += 2;
430
431 if (strncmp(opt, name, namelen))
432 return FALSE;
433
434 if (opt[namelen] == '=')
435 value = opt + namelen + 1;
436
437 } else {
438 if (!short_name || opt[1] != short_name)
439 return FALSE;
440 value = opt + 2;
441 }
442
443 va_start(args, type);
444 if (type == OPT_INT) {
445 number = va_arg(args, int *);
446 if (isdigit(*value))
447 *number = atoi(value);
448 }
449 va_end(args);
450
451 return TRUE;
452 }
453
454 /* Returns the index of log or diff command or -1 to exit. */
455 static bool
456 parse_options(int argc, char *argv[])
457 {
458 int i;
459
460 for (i = 1; i < argc; i++) {
461 char *opt = argv[i];
462
463 if (!strcmp(opt, "-l")) {
464 opt_request = REQ_VIEW_LOG;
465 continue;
466 }
467
468 if (!strcmp(opt, "-d")) {
469 opt_request = REQ_VIEW_DIFF;
470 continue;
471 }
472
473 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
474 opt_line_number = TRUE;
475 continue;
476 }
477
478 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
479 opt_tab_size = MIN(opt_tab_size, TABSIZE);
480 continue;
481 }
482
483 if (check_option(opt, 'v', "version", OPT_NONE)) {
484 printf("tig version %s\n", VERSION);
485 return FALSE;
486 }
487
488 if (check_option(opt, 'h', "help", OPT_NONE)) {
489 printf(usage);
490 return FALSE;
491 }
492
493 if (!strcmp(opt, "--")) {
494 i++;
495 break;
496 }
497
498 if (!strcmp(opt, "log") ||
499 !strcmp(opt, "diff") ||
500 !strcmp(opt, "show")) {
501 opt_request = opt[0] == 'l'
502 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
503 break;
504 }
505
506 if (opt[0] && opt[0] != '-')
507 break;
508
509 die("unknown option '%s'\n\n%s", opt, usage);
510 }
511
512 if (!isatty(STDIN_FILENO)) {
513 opt_request = REQ_VIEW_PAGER;
514 opt_pipe = stdin;
515
516 } else if (i < argc) {
517 size_t buf_size;
518
519 if (opt_request == REQ_VIEW_MAIN)
520 /* XXX: This is vulnerable to the user overriding
521 * options required for the main view parser. */
522 string_copy(opt_cmd, "git log --stat --pretty=raw");
523 else
524 string_copy(opt_cmd, "git");
525 buf_size = strlen(opt_cmd);
526
527 while (buf_size < sizeof(opt_cmd) && i < argc) {
528 opt_cmd[buf_size++] = ' ';
529 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
530 }
531
532 if (buf_size >= sizeof(opt_cmd))
533 die("command too long");
534
535 opt_cmd[buf_size] = 0;
536
537 }
538
539 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
540 opt_utf8 = FALSE;
541
542 return TRUE;
543 }
544
545
546 /*
547 * Line-oriented content detection.
548 */
549
550 #define LINE_INFO \
551 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
552 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
553 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
554 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
555 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
556 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
557 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
558 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
559 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
560 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
561 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
562 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
563 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
564 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
565 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
566 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
567 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
568 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
569 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
570 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
571 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
572 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
573 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
574 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
575 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
576 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
577 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
578 LINE(ACKED, " Acked-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
579 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
580 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
581 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
582 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
583 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
584 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
585 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
586 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
587 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
588 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
589 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
590 LINE(TREE_DIR, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
591 LINE(TREE_FILE, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL)
592
593 enum line_type {
594 #define LINE(type, line, fg, bg, attr) \
595 LINE_##type
596 LINE_INFO
597 #undef LINE
598 };
599
600 struct line_info {
601 const char *name; /* Option name. */
602 int namelen; /* Size of option name. */
603 const char *line; /* The start of line to match. */
604 int linelen; /* Size of string to match. */
605 int fg, bg, attr; /* Color and text attributes for the lines. */
606 };
607
608 static struct line_info line_info[] = {
609 #define LINE(type, line, fg, bg, attr) \
610 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
611 LINE_INFO
612 #undef LINE
613 };
614
615 static enum line_type
616 get_line_type(char *line)
617 {
618 int linelen = strlen(line);
619 enum line_type type;
620
621 for (type = 0; type < ARRAY_SIZE(line_info); type++)
622 /* Case insensitive search matches Signed-off-by lines better. */
623 if (linelen >= line_info[type].linelen &&
624 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
625 return type;
626
627 return LINE_DEFAULT;
628 }
629
630 static inline int
631 get_line_attr(enum line_type type)
632 {
633 assert(type < ARRAY_SIZE(line_info));
634 return COLOR_PAIR(type) | line_info[type].attr;
635 }
636
637 static struct line_info *
638 get_line_info(char *name, int namelen)
639 {
640 enum line_type type;
641
642 for (type = 0; type < ARRAY_SIZE(line_info); type++)
643 if (namelen == line_info[type].namelen &&
644 !string_enum_compare(line_info[type].name, name, namelen))
645 return &line_info[type];
646
647 return NULL;
648 }
649
650 static void
651 init_colors(void)
652 {
653 int default_bg = COLOR_BLACK;
654 int default_fg = COLOR_WHITE;
655 enum line_type type;
656
657 start_color();
658
659 if (use_default_colors() != ERR) {
660 default_bg = -1;
661 default_fg = -1;
662 }
663
664 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
665 struct line_info *info = &line_info[type];
666 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
667 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
668
669 init_pair(type, fg, bg);
670 }
671 }
672
673 struct line {
674 enum line_type type;
675
676 /* State flags */
677 unsigned int selected:1;
678
679 void *data; /* User data */
680 };
681
682
683 /*
684 * Keys
685 */
686
687 struct keybinding {
688 int alias;
689 enum request request;
690 struct keybinding *next;
691 };
692
693 static struct keybinding default_keybindings[] = {
694 /* View switching */
695 { 'm', REQ_VIEW_MAIN },
696 { 'd', REQ_VIEW_DIFF },
697 { 'l', REQ_VIEW_LOG },
698 { 't', REQ_VIEW_TREE },
699 { 'f', REQ_VIEW_BLOB },
700 { 'p', REQ_VIEW_PAGER },
701 { 'h', REQ_VIEW_HELP },
702
703 /* View manipulation */
704 { 'q', REQ_VIEW_CLOSE },
705 { KEY_TAB, REQ_VIEW_NEXT },
706 { KEY_RETURN, REQ_ENTER },
707 { KEY_UP, REQ_PREVIOUS },
708 { KEY_DOWN, REQ_NEXT },
709
710 /* Cursor navigation */
711 { 'k', REQ_MOVE_UP },
712 { 'j', REQ_MOVE_DOWN },
713 { KEY_HOME, REQ_MOVE_FIRST_LINE },
714 { KEY_END, REQ_MOVE_LAST_LINE },
715 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
716 { ' ', REQ_MOVE_PAGE_DOWN },
717 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
718 { 'b', REQ_MOVE_PAGE_UP },
719 { '-', REQ_MOVE_PAGE_UP },
720
721 /* Scrolling */
722 { KEY_IC, REQ_SCROLL_LINE_UP },
723 { KEY_DC, REQ_SCROLL_LINE_DOWN },
724 { 'w', REQ_SCROLL_PAGE_UP },
725 { 's', REQ_SCROLL_PAGE_DOWN },
726
727 /* Searching */
728 { '/', REQ_SEARCH },
729 { '?', REQ_SEARCH_BACK },
730 { 'n', REQ_FIND_NEXT },
731 { 'N', REQ_FIND_PREV },
732
733 /* Misc */
734 { 'Q', REQ_QUIT },
735 { 'z', REQ_STOP_LOADING },
736 { 'v', REQ_SHOW_VERSION },
737 { 'r', REQ_SCREEN_REDRAW },
738 { '.', REQ_TOGGLE_LINENO },
739 { 'g', REQ_TOGGLE_REV_GRAPH },
740 { ':', REQ_PROMPT },
741
742 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
743 { ERR, REQ_NONE },
744
745 /* Using the ncurses SIGWINCH handler. */
746 { KEY_RESIZE, REQ_SCREEN_RESIZE },
747 };
748
749 #define KEYMAP_INFO \
750 KEYMAP_(GENERIC), \
751 KEYMAP_(MAIN), \
752 KEYMAP_(DIFF), \
753 KEYMAP_(LOG), \
754 KEYMAP_(TREE), \
755 KEYMAP_(BLOB), \
756 KEYMAP_(PAGER), \
757 KEYMAP_(HELP) \
758
759 enum keymap {
760 #define KEYMAP_(name) KEYMAP_##name
761 KEYMAP_INFO
762 #undef KEYMAP_
763 };
764
765 static struct int_map keymap_table[] = {
766 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
767 KEYMAP_INFO
768 #undef KEYMAP_
769 };
770
771 #define set_keymap(map, name) \
772 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
773
774 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
775
776 static void
777 add_keybinding(enum keymap keymap, enum request request, int key)
778 {
779 struct keybinding *keybinding;
780
781 keybinding = calloc(1, sizeof(*keybinding));
782 if (!keybinding)
783 die("Failed to allocate keybinding");
784
785 keybinding->alias = key;
786 keybinding->request = request;
787 keybinding->next = keybindings[keymap];
788 keybindings[keymap] = keybinding;
789 }
790
791 /* Looks for a key binding first in the given map, then in the generic map, and
792 * lastly in the default keybindings. */
793 static enum request
794 get_keybinding(enum keymap keymap, int key)
795 {
796 struct keybinding *kbd;
797 int i;
798
799 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
800 if (kbd->alias == key)
801 return kbd->request;
802
803 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
804 if (kbd->alias == key)
805 return kbd->request;
806
807 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
808 if (default_keybindings[i].alias == key)
809 return default_keybindings[i].request;
810
811 return (enum request) key;
812 }
813
814
815 struct key {
816 char *name;
817 int value;
818 };
819
820 static struct key key_table[] = {
821 { "Enter", KEY_RETURN },
822 { "Space", ' ' },
823 { "Backspace", KEY_BACKSPACE },
824 { "Tab", KEY_TAB },
825 { "Escape", KEY_ESC },
826 { "Left", KEY_LEFT },
827 { "Right", KEY_RIGHT },
828 { "Up", KEY_UP },
829 { "Down", KEY_DOWN },
830 { "Insert", KEY_IC },
831 { "Delete", KEY_DC },
832 { "Hash", '#' },
833 { "Home", KEY_HOME },
834 { "End", KEY_END },
835 { "PageUp", KEY_PPAGE },
836 { "PageDown", KEY_NPAGE },
837 { "F1", KEY_F(1) },
838 { "F2", KEY_F(2) },
839 { "F3", KEY_F(3) },
840 { "F4", KEY_F(4) },
841 { "F5", KEY_F(5) },
842 { "F6", KEY_F(6) },
843 { "F7", KEY_F(7) },
844 { "F8", KEY_F(8) },
845 { "F9", KEY_F(9) },
846 { "F10", KEY_F(10) },
847 { "F11", KEY_F(11) },
848 { "F12", KEY_F(12) },
849 };
850
851 static int
852 get_key_value(const char *name)
853 {
854 int i;
855
856 for (i = 0; i < ARRAY_SIZE(key_table); i++)
857 if (!strcasecmp(key_table[i].name, name))
858 return key_table[i].value;
859
860 if (strlen(name) == 1 && isprint(*name))
861 return (int) *name;
862
863 return ERR;
864 }
865
866 static char *
867 get_key(enum request request)
868 {
869 static char buf[BUFSIZ];
870 static char key_char[] = "'X'";
871 size_t pos = 0;
872 char *sep = " ";
873 int i;
874
875 buf[pos] = 0;
876
877 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
878 struct keybinding *keybinding = &default_keybindings[i];
879 char *seq = NULL;
880 int key;
881
882 if (keybinding->request != request)
883 continue;
884
885 for (key = 0; key < ARRAY_SIZE(key_table); key++)
886 if (key_table[key].value == keybinding->alias)
887 seq = key_table[key].name;
888
889 if (seq == NULL &&
890 keybinding->alias < 127 &&
891 isprint(keybinding->alias)) {
892 key_char[1] = (char) keybinding->alias;
893 seq = key_char;
894 }
895
896 if (!seq)
897 seq = "'?'";
898
899 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
900 return "Too many keybindings!";
901 sep = ", ";
902 }
903
904 return buf;
905 }
906
907
908 /*
909 * User config file handling.
910 */
911
912 static struct int_map color_map[] = {
913 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
914 COLOR_MAP(DEFAULT),
915 COLOR_MAP(BLACK),
916 COLOR_MAP(BLUE),
917 COLOR_MAP(CYAN),
918 COLOR_MAP(GREEN),
919 COLOR_MAP(MAGENTA),
920 COLOR_MAP(RED),
921 COLOR_MAP(WHITE),
922 COLOR_MAP(YELLOW),
923 };
924
925 #define set_color(color, name) \
926 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
927
928 static struct int_map attr_map[] = {
929 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
930 ATTR_MAP(NORMAL),
931 ATTR_MAP(BLINK),
932 ATTR_MAP(BOLD),
933 ATTR_MAP(DIM),
934 ATTR_MAP(REVERSE),
935 ATTR_MAP(STANDOUT),
936 ATTR_MAP(UNDERLINE),
937 };
938
939 #define set_attribute(attr, name) \
940 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
941
942 static int config_lineno;
943 static bool config_errors;
944 static char *config_msg;
945
946 /* Wants: object fgcolor bgcolor [attr] */
947 static int
948 option_color_command(int argc, char *argv[])
949 {
950 struct line_info *info;
951
952 if (argc != 3 && argc != 4) {
953 config_msg = "Wrong number of arguments given to color command";
954 return ERR;
955 }
956
957 info = get_line_info(argv[0], strlen(argv[0]));
958 if (!info) {
959 config_msg = "Unknown color name";
960 return ERR;
961 }
962
963 if (set_color(&info->fg, argv[1]) == ERR ||
964 set_color(&info->bg, argv[2]) == ERR) {
965 config_msg = "Unknown color";
966 return ERR;
967 }
968
969 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
970 config_msg = "Unknown attribute";
971 return ERR;
972 }
973
974 return OK;
975 }
976
977 /* Wants: name = value */
978 static int
979 option_set_command(int argc, char *argv[])
980 {
981 if (argc != 3) {
982 config_msg = "Wrong number of arguments given to set command";
983 return ERR;
984 }
985
986 if (strcmp(argv[1], "=")) {
987 config_msg = "No value assigned";
988 return ERR;
989 }
990
991 if (!strcmp(argv[0], "show-rev-graph")) {
992 opt_rev_graph = (!strcmp(argv[2], "1") ||
993 !strcmp(argv[2], "true") ||
994 !strcmp(argv[2], "yes"));
995 return OK;
996 }
997
998 if (!strcmp(argv[0], "line-number-interval")) {
999 opt_num_interval = atoi(argv[2]);
1000 return OK;
1001 }
1002
1003 if (!strcmp(argv[0], "tab-size")) {
1004 opt_tab_size = atoi(argv[2]);
1005 return OK;
1006 }
1007
1008 if (!strcmp(argv[0], "commit-encoding")) {
1009 char *arg = argv[2];
1010 int delimiter = *arg;
1011 int i;
1012
1013 switch (delimiter) {
1014 case '"':
1015 case '\'':
1016 for (arg++, i = 0; arg[i]; i++)
1017 if (arg[i] == delimiter) {
1018 arg[i] = 0;
1019 break;
1020 }
1021 default:
1022 string_copy(opt_encoding, arg);
1023 return OK;
1024 }
1025 }
1026
1027 config_msg = "Unknown variable name";
1028 return ERR;
1029 }
1030
1031 /* Wants: mode request key */
1032 static int
1033 option_bind_command(int argc, char *argv[])
1034 {
1035 enum request request;
1036 int keymap;
1037 int key;
1038
1039 if (argc != 3) {
1040 config_msg = "Wrong number of arguments given to bind command";
1041 return ERR;
1042 }
1043
1044 if (set_keymap(&keymap, argv[0]) == ERR) {
1045 config_msg = "Unknown key map";
1046 return ERR;
1047 }
1048
1049 key = get_key_value(argv[1]);
1050 if (key == ERR) {
1051 config_msg = "Unknown key";
1052 return ERR;
1053 }
1054
1055 request = get_request(argv[2]);
1056 if (request == REQ_UNKNOWN) {
1057 config_msg = "Unknown request name";
1058 return ERR;
1059 }
1060
1061 add_keybinding(keymap, request, key);
1062
1063 return OK;
1064 }
1065
1066 static int
1067 set_option(char *opt, char *value)
1068 {
1069 char *argv[16];
1070 int valuelen;
1071 int argc = 0;
1072
1073 /* Tokenize */
1074 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1075 argv[argc++] = value;
1076
1077 value += valuelen;
1078 if (!*value)
1079 break;
1080
1081 *value++ = 0;
1082 while (isspace(*value))
1083 value++;
1084 }
1085
1086 if (!strcmp(opt, "color"))
1087 return option_color_command(argc, argv);
1088
1089 if (!strcmp(opt, "set"))
1090 return option_set_command(argc, argv);
1091
1092 if (!strcmp(opt, "bind"))
1093 return option_bind_command(argc, argv);
1094
1095 config_msg = "Unknown option command";
1096 return ERR;
1097 }
1098
1099 static int
1100 read_option(char *opt, int optlen, char *value, int valuelen)
1101 {
1102 int status = OK;
1103
1104 config_lineno++;
1105 config_msg = "Internal error";
1106
1107 /* Check for comment markers, since read_properties() will
1108 * only ensure opt and value are split at first " \t". */
1109 optlen = strcspn(opt, "#");
1110 if (optlen == 0)
1111 return OK;
1112
1113 if (opt[optlen] != 0) {
1114 config_msg = "No option value";
1115 status = ERR;
1116
1117 } else {
1118 /* Look for comment endings in the value. */
1119 int len = strcspn(value, "#");
1120
1121 if (len < valuelen) {
1122 valuelen = len;
1123 value[valuelen] = 0;
1124 }
1125
1126 status = set_option(opt, value);
1127 }
1128
1129 if (status == ERR) {
1130 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1131 config_lineno, optlen, opt, config_msg);
1132 config_errors = TRUE;
1133 }
1134
1135 /* Always keep going if errors are encountered. */
1136 return OK;
1137 }
1138
1139 static int
1140 load_options(void)
1141 {
1142 char *home = getenv("HOME");
1143 char buf[SIZEOF_STR];
1144 FILE *file;
1145
1146 config_lineno = 0;
1147 config_errors = FALSE;
1148
1149 if (!home || !string_format(buf, "%s/.tigrc", home))
1150 return ERR;
1151
1152 /* It's ok that the file doesn't exist. */
1153 file = fopen(buf, "r");
1154 if (!file)
1155 return OK;
1156
1157 if (read_properties(file, " \t", read_option) == ERR ||
1158 config_errors == TRUE)
1159 fprintf(stderr, "Errors while loading %s.\n", buf);
1160
1161 return OK;
1162 }
1163
1164
1165 /*
1166 * The viewer
1167 */
1168
1169 struct view;
1170 struct view_ops;
1171
1172 /* The display array of active views and the index of the current view. */
1173 static struct view *display[2];
1174 static unsigned int current_view;
1175
1176 #define foreach_displayed_view(view, i) \
1177 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1178
1179 #define displayed_views() (display[1] != NULL ? 2 : 1)
1180
1181 /* Current head and commit ID */
1182 static char ref_blob[SIZEOF_REF] = "";
1183 static char ref_commit[SIZEOF_REF] = "HEAD";
1184 static char ref_head[SIZEOF_REF] = "HEAD";
1185
1186 struct view {
1187 const char *name; /* View name */
1188 const char *cmd_fmt; /* Default command line format */
1189 const char *cmd_env; /* Command line set via environment */
1190 const char *id; /* Points to either of ref_{head,commit,blob} */
1191
1192 struct view_ops *ops; /* View operations */
1193
1194 enum keymap keymap; /* What keymap does this view have */
1195
1196 char cmd[SIZEOF_STR]; /* Command buffer */
1197 char ref[SIZEOF_REF]; /* Hovered commit reference */
1198 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
1199
1200 int height, width; /* The width and height of the main window */
1201 WINDOW *win; /* The main window */
1202 WINDOW *title; /* The title window living below the main window */
1203
1204 /* Navigation */
1205 unsigned long offset; /* Offset of the window top */
1206 unsigned long lineno; /* Current line number */
1207
1208 /* Searching */
1209 char grep[SIZEOF_STR]; /* Search string */
1210 regex_t *regex; /* Pre-compiled regex */
1211
1212 /* If non-NULL, points to the view that opened this view. If this view
1213 * is closed tig will switch back to the parent view. */
1214 struct view *parent;
1215
1216 /* Buffering */
1217 unsigned long lines; /* Total number of lines */
1218 struct line *line; /* Line index */
1219 unsigned long line_size;/* Total number of allocated lines */
1220 unsigned int digits; /* Number of digits in the lines member. */
1221
1222 /* Loading */
1223 FILE *pipe;
1224 time_t start_time;
1225 };
1226
1227 struct view_ops {
1228 /* What type of content being displayed. Used in the title bar. */
1229 const char *type;
1230 /* Draw one line; @lineno must be < view->height. */
1231 bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
1232 /* Read one line; updates view->line. */
1233 bool (*read)(struct view *view, char *data);
1234 /* Depending on view, change display based on current line. */
1235 bool (*enter)(struct view *view, struct line *line);
1236 /* Search for regex in a line. */
1237 bool (*grep)(struct view *view, struct line *line);
1238 /* Select line */
1239 void (*select)(struct view *view, struct line *line);
1240 };
1241
1242 static struct view_ops pager_ops;
1243 static struct view_ops main_ops;
1244 static struct view_ops tree_ops;
1245 static struct view_ops blob_ops;
1246
1247 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1248 { name, cmd, #env, ref, ops, map}
1249
1250 #define VIEW_(id, name, ops, ref) \
1251 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1252
1253
1254 static struct view views[] = {
1255 VIEW_(MAIN, "main", &main_ops, ref_head),
1256 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1257 VIEW_(LOG, "log", &pager_ops, ref_head),
1258 VIEW_(TREE, "tree", &tree_ops, ref_commit),
1259 VIEW_(BLOB, "blob", &blob_ops, ref_blob),
1260 VIEW_(HELP, "help", &pager_ops, "static"),
1261 VIEW_(PAGER, "pager", &pager_ops, "static"),
1262 };
1263
1264 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1265
1266 #define foreach_view(view, i) \
1267 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1268
1269 #define view_is_displayed(view) \
1270 (view == display[0] || view == display[1])
1271
1272 static bool
1273 draw_view_line(struct view *view, unsigned int lineno)
1274 {
1275 struct line *line;
1276 bool selected = (view->offset + lineno == view->lineno);
1277
1278 assert(view_is_displayed(view));
1279
1280 if (view->offset + lineno >= view->lines)
1281 return FALSE;
1282
1283 line = &view->line[view->offset + lineno];
1284
1285 if (selected) {
1286 line->selected = TRUE;
1287 view->ops->select(view, line);
1288 } else if (line->selected) {
1289 line->selected = FALSE;
1290 wmove(view->win, lineno, 0);
1291 wclrtoeol(view->win);
1292 }
1293
1294 return view->ops->draw(view, line, lineno, selected);
1295 }
1296
1297 static void
1298 redraw_view_from(struct view *view, int lineno)
1299 {
1300 assert(0 <= lineno && lineno < view->height);
1301
1302 for (; lineno < view->height; lineno++) {
1303 if (!draw_view_line(view, lineno))
1304 break;
1305 }
1306
1307 redrawwin(view->win);
1308 wrefresh(view->win);
1309 }
1310
1311 static void
1312 redraw_view(struct view *view)
1313 {
1314 wclear(view->win);
1315 redraw_view_from(view, 0);
1316 }
1317
1318
1319 static void
1320 update_view_title(struct view *view)
1321 {
1322 assert(view_is_displayed(view));
1323
1324 if (view == display[current_view])
1325 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1326 else
1327 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1328
1329 werase(view->title);
1330 wmove(view->title, 0, 0);
1331
1332 if (*view->ref)
1333 wprintw(view->title, "[%s] %s", view->name, view->ref);
1334 else
1335 wprintw(view->title, "[%s]", view->name);
1336
1337 if (view->lines || view->pipe) {
1338 unsigned int view_lines = view->offset + view->height;
1339 unsigned int lines = view->lines
1340 ? MIN(view_lines, view->lines) * 100 / view->lines
1341 : 0;
1342
1343 wprintw(view->title, " - %s %d of %d (%d%%)",
1344 view->ops->type,
1345 view->lineno + 1,
1346 view->lines,
1347 lines);
1348 }
1349
1350 if (view->pipe) {
1351 time_t secs = time(NULL) - view->start_time;
1352
1353 /* Three git seconds are a long time ... */
1354 if (secs > 2)
1355 wprintw(view->title, " %lds", secs);
1356 }
1357
1358 wmove(view->title, 0, view->width - 1);
1359 wrefresh(view->title);
1360 }
1361
1362 static void
1363 resize_display(void)
1364 {
1365 int offset, i;
1366 struct view *base = display[0];
1367 struct view *view = display[1] ? display[1] : display[0];
1368
1369 /* Setup window dimensions */
1370
1371 getmaxyx(stdscr, base->height, base->width);
1372
1373 /* Make room for the status window. */
1374 base->height -= 1;
1375
1376 if (view != base) {
1377 /* Horizontal split. */
1378 view->width = base->width;
1379 view->height = SCALE_SPLIT_VIEW(base->height);
1380 base->height -= view->height;
1381
1382 /* Make room for the title bar. */
1383 view->height -= 1;
1384 }
1385
1386 /* Make room for the title bar. */
1387 base->height -= 1;
1388
1389 offset = 0;
1390
1391 foreach_displayed_view (view, i) {
1392 if (!view->win) {
1393 view->win = newwin(view->height, 0, offset, 0);
1394 if (!view->win)
1395 die("Failed to create %s view", view->name);
1396
1397 scrollok(view->win, TRUE);
1398
1399 view->title = newwin(1, 0, offset + view->height, 0);
1400 if (!view->title)
1401 die("Failed to create title window");
1402
1403 } else {
1404 wresize(view->win, view->height, view->width);
1405 mvwin(view->win, offset, 0);
1406 mvwin(view->title, offset + view->height, 0);
1407 }
1408
1409 offset += view->height + 1;
1410 }
1411 }
1412
1413 static void
1414 redraw_display(void)
1415 {
1416 struct view *view;
1417 int i;
1418
1419 foreach_displayed_view (view, i) {
1420 redraw_view(view);
1421 update_view_title(view);
1422 }
1423 }
1424
1425 static void
1426 update_display_cursor(void)
1427 {
1428 struct view *view = display[current_view];
1429
1430 /* Move the cursor to the right-most column of the cursor line.
1431 *
1432 * XXX: This could turn out to be a bit expensive, but it ensures that
1433 * the cursor does not jump around. */
1434 if (view->lines) {
1435 wmove(view->win, view->lineno - view->offset, view->width - 1);
1436 wrefresh(view->win);
1437 }
1438 }
1439
1440 /*
1441 * Navigation
1442 */
1443
1444 /* Scrolling backend */
1445 static void
1446 do_scroll_view(struct view *view, int lines)
1447 {
1448 bool redraw_current_line = FALSE;
1449
1450 /* The rendering expects the new offset. */
1451 view->offset += lines;
1452
1453 assert(0 <= view->offset && view->offset < view->lines);
1454 assert(lines);
1455
1456 /* Move current line into the view. */
1457 if (view->lineno < view->offset) {
1458 view->lineno = view->offset;
1459 redraw_current_line = TRUE;
1460 } else if (view->lineno >= view->offset + view->height) {
1461 view->lineno = view->offset + view->height - 1;
1462 redraw_current_line = TRUE;
1463 }
1464
1465 assert(view->offset <= view->lineno && view->lineno < view->lines);
1466
1467 /* Redraw the whole screen if scrolling is pointless. */
1468 if (view->height < ABS(lines)) {
1469 redraw_view(view);
1470
1471 } else {
1472 int line = lines > 0 ? view->height - lines : 0;
1473 int end = line + ABS(lines);
1474
1475 wscrl(view->win, lines);
1476
1477 for (; line < end; line++) {
1478 if (!draw_view_line(view, line))
1479 break;
1480 }
1481
1482 if (redraw_current_line)
1483 draw_view_line(view, view->lineno - view->offset);
1484 }
1485
1486 redrawwin(view->win);
1487 wrefresh(view->win);
1488 report("");
1489 }
1490
1491 /* Scroll frontend */
1492 static void
1493 scroll_view(struct view *view, enum request request)
1494 {
1495 int lines = 1;
1496
1497 assert(view_is_displayed(view));
1498
1499 switch (request) {
1500 case REQ_SCROLL_PAGE_DOWN:
1501 lines = view->height;
1502 case REQ_SCROLL_LINE_DOWN:
1503 if (view->offset + lines > view->lines)
1504 lines = view->lines - view->offset;
1505
1506 if (lines == 0 || view->offset + view->height >= view->lines) {
1507 report("Cannot scroll beyond the last line");
1508 return;
1509 }
1510 break;
1511
1512 case REQ_SCROLL_PAGE_UP:
1513 lines = view->height;
1514 case REQ_SCROLL_LINE_UP:
1515 if (lines > view->offset)
1516 lines = view->offset;
1517
1518 if (lines == 0) {
1519 report("Cannot scroll beyond the first line");
1520 return;
1521 }
1522
1523 lines = -lines;
1524 break;
1525
1526 default:
1527 die("request %d not handled in switch", request);
1528 }
1529
1530 do_scroll_view(view, lines);
1531 }
1532
1533 /* Cursor moving */
1534 static void
1535 move_view(struct view *view, enum request request)
1536 {
1537 int scroll_steps = 0;
1538 int steps;
1539
1540 switch (request) {
1541 case REQ_MOVE_FIRST_LINE:
1542 steps = -view->lineno;
1543 break;
1544
1545 case REQ_MOVE_LAST_LINE:
1546 steps = view->lines - view->lineno - 1;
1547 break;
1548
1549 case REQ_MOVE_PAGE_UP:
1550 steps = view->height > view->lineno
1551 ? -view->lineno : -view->height;
1552 break;
1553
1554 case REQ_MOVE_PAGE_DOWN:
1555 steps = view->lineno + view->height >= view->lines
1556 ? view->lines - view->lineno - 1 : view->height;
1557 break;
1558
1559 case REQ_MOVE_UP:
1560 steps = -1;
1561 break;
1562
1563 case REQ_MOVE_DOWN:
1564 steps = 1;
1565 break;
1566
1567 default:
1568 die("request %d not handled in switch", request);
1569 }
1570
1571 if (steps <= 0 && view->lineno == 0) {
1572 report("Cannot move beyond the first line");
1573 return;
1574
1575 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1576 report("Cannot move beyond the last line");
1577 return;
1578 }
1579
1580 /* Move the current line */
1581 view->lineno += steps;
1582 assert(0 <= view->lineno && view->lineno < view->lines);
1583
1584 /* Check whether the view needs to be scrolled */
1585 if (view->lineno < view->offset ||
1586 view->lineno >= view->offset + view->height) {
1587 scroll_steps = steps;
1588 if (steps < 0 && -steps > view->offset) {
1589 scroll_steps = -view->offset;
1590
1591 } else if (steps > 0) {
1592 if (view->lineno == view->lines - 1 &&
1593 view->lines > view->height) {
1594 scroll_steps = view->lines - view->offset - 1;
1595 if (scroll_steps >= view->height)
1596 scroll_steps -= view->height - 1;
1597 }
1598 }
1599 }
1600
1601 if (!view_is_displayed(view)) {
1602 view->offset += steps;
1603 view->ops->select(view, &view->line[view->lineno]);
1604 return;
1605 }
1606
1607 /* Repaint the old "current" line if we be scrolling */
1608 if (ABS(steps) < view->height)
1609 draw_view_line(view, view->lineno - steps - view->offset);
1610
1611 if (scroll_steps) {
1612 do_scroll_view(view, scroll_steps);
1613 return;
1614 }
1615
1616 /* Draw the current line */
1617 draw_view_line(view, view->lineno - view->offset);
1618
1619 redrawwin(view->win);
1620 wrefresh(view->win);
1621 report("");
1622 }
1623
1624
1625 /*
1626 * Searching
1627 */
1628
1629 static void search_view(struct view *view, enum request request);
1630
1631 static bool
1632 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1633 {
1634 assert(view_is_displayed(view));
1635
1636 if (!view->ops->grep(view, line))
1637 return FALSE;
1638
1639 if (lineno - view->offset >= view->height) {
1640 view->offset = lineno;
1641 view->lineno = lineno;
1642 redraw_view(view);
1643
1644 } else {
1645 unsigned long old_lineno = view->lineno - view->offset;
1646
1647 view->lineno = lineno;
1648 draw_view_line(view, old_lineno);
1649
1650 draw_view_line(view, view->lineno - view->offset);
1651 redrawwin(view->win);
1652 wrefresh(view->win);
1653 }
1654
1655 report("Line %ld matches '%s'", lineno + 1, view->grep);
1656 return TRUE;
1657 }
1658
1659 static void
1660 find_next(struct view *view, enum request request)
1661 {
1662 unsigned long lineno = view->lineno;
1663 int direction;
1664
1665 if (!*view->grep) {
1666 if (!*opt_search)
1667 report("No previous search");
1668 else
1669 search_view(view, request);
1670 return;
1671 }
1672
1673 switch (request) {
1674 case REQ_SEARCH:
1675 case REQ_FIND_NEXT:
1676 direction = 1;
1677 break;
1678
1679 case REQ_SEARCH_BACK:
1680 case REQ_FIND_PREV:
1681 direction = -1;
1682 break;
1683
1684 default:
1685 return;
1686 }
1687
1688 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1689 lineno += direction;
1690
1691 /* Note, lineno is unsigned long so will wrap around in which case it
1692 * will become bigger than view->lines. */
1693 for (; lineno < view->lines; lineno += direction) {
1694 struct line *line = &view->line[lineno];
1695
1696 if (find_next_line(view, lineno, line))
1697 return;
1698 }
1699
1700 report("No match found for '%s'", view->grep);
1701 }
1702
1703 static void
1704 search_view(struct view *view, enum request request)
1705 {
1706 int regex_err;
1707
1708 if (view->regex) {
1709 regfree(view->regex);
1710 *view->grep = 0;
1711 } else {
1712 view->regex = calloc(1, sizeof(*view->regex));
1713 if (!view->regex)
1714 return;
1715 }
1716
1717 regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
1718 if (regex_err != 0) {
1719 char buf[SIZEOF_STR] = "unknown error";
1720
1721 regerror(regex_err, view->regex, buf, sizeof(buf));
1722 report("Search failed: %s", buf);
1723 return;
1724 }
1725
1726 string_copy(view->grep, opt_search);
1727
1728 find_next(view, request);
1729 }
1730
1731 /*
1732 * Incremental updating
1733 */
1734
1735 static void
1736 end_update(struct view *view)
1737 {
1738 if (!view->pipe)
1739 return;
1740 set_nonblocking_input(FALSE);
1741 if (view->pipe == stdin)
1742 fclose(view->pipe);
1743 else
1744 pclose(view->pipe);
1745 view->pipe = NULL;
1746 }
1747
1748 static bool
1749 begin_update(struct view *view)
1750 {
1751 const char *id = view->id;
1752
1753 if (view->pipe)
1754 end_update(view);
1755
1756 if (opt_cmd[0]) {
1757 string_copy(view->cmd, opt_cmd);
1758 opt_cmd[0] = 0;
1759 /* When running random commands, the view ref could have become
1760 * invalid so clear it. */
1761 view->ref[0] = 0;
1762
1763 } else if (view == VIEW(REQ_VIEW_TREE)) {
1764 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1765
1766 if (strcmp(view->vid, view->id))
1767 opt_path[0] = 0;
1768
1769 if (!string_format(view->cmd, format, id, opt_path))
1770 return FALSE;
1771
1772 } else {
1773 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1774
1775 if (!string_format(view->cmd, format, id, id, id, id, id))
1776 return FALSE;
1777 }
1778
1779 /* Special case for the pager view. */
1780 if (opt_pipe) {
1781 view->pipe = opt_pipe;
1782 opt_pipe = NULL;
1783 } else {
1784 view->pipe = popen(view->cmd, "r");
1785 }
1786
1787 if (!view->pipe)
1788 return FALSE;
1789
1790 set_nonblocking_input(TRUE);
1791
1792 view->offset = 0;
1793 view->lines = 0;
1794 view->lineno = 0;
1795 string_copy(view->vid, id);
1796
1797 if (view->line) {
1798 int i;
1799
1800 for (i = 0; i < view->lines; i++)
1801 if (view->line[i].data)
1802 free(view->line[i].data);
1803
1804 free(view->line);
1805 view->line = NULL;
1806 }
1807
1808 view->start_time = time(NULL);
1809
1810 return TRUE;
1811 }
1812
1813 static struct line *
1814 realloc_lines(struct view *view, size_t line_size)
1815 {
1816 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1817
1818 if (!tmp)
1819 return NULL;
1820
1821 view->line = tmp;
1822 view->line_size = line_size;
1823 return view->line;
1824 }
1825
1826 static bool
1827 update_view(struct view *view)
1828 {
1829 char in_buffer[BUFSIZ];
1830 char out_buffer[BUFSIZ * 2];
1831 char *line;
1832 /* The number of lines to read. If too low it will cause too much
1833 * redrawing (and possible flickering), if too high responsiveness
1834 * will suffer. */
1835 unsigned long lines = view->height;
1836 int redraw_from = -1;
1837
1838 if (!view->pipe)
1839 return TRUE;
1840
1841 /* Only redraw if lines are visible. */
1842 if (view->offset + view->height >= view->lines)
1843 redraw_from = view->lines - view->offset;
1844
1845 /* FIXME: This is probably not perfect for backgrounded views. */
1846 if (!realloc_lines(view, view->lines + lines))
1847 goto alloc_error;
1848
1849 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1850 size_t linelen = strlen(line);
1851
1852 if (linelen)
1853 line[linelen - 1] = 0;
1854
1855 if (opt_iconv != ICONV_NONE) {
1856 char *inbuf = line;
1857 size_t inlen = linelen;
1858
1859 char *outbuf = out_buffer;
1860 size_t outlen = sizeof(out_buffer);
1861
1862 size_t ret;
1863
1864 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1865 if (ret != (size_t) -1) {
1866 line = out_buffer;
1867 linelen = strlen(out_buffer);
1868 }
1869 }
1870
1871 if (!view->ops->read(view, line))
1872 goto alloc_error;
1873
1874 if (lines-- == 1)
1875 break;
1876 }
1877
1878 {
1879 int digits;
1880
1881 lines = view->lines;
1882 for (digits = 0; lines; digits++)
1883 lines /= 10;
1884
1885 /* Keep the displayed view in sync with line number scaling. */
1886 if (digits != view->digits) {
1887 view->digits = digits;
1888 redraw_from = 0;
1889 }
1890 }
1891
1892 if (!view_is_displayed(view))
1893 goto check_pipe;
1894
1895 if (view == VIEW(REQ_VIEW_TREE)) {
1896 /* Clear the view and redraw everything since the tree sorting
1897 * might have rearranged things. */
1898 redraw_view(view);
1899
1900 } else if (redraw_from >= 0) {
1901 /* If this is an incremental update, redraw the previous line
1902 * since for commits some members could have changed when
1903 * loading the main view. */
1904 if (redraw_from > 0)
1905 redraw_from--;
1906
1907 /* Incrementally draw avoids flickering. */
1908 redraw_view_from(view, redraw_from);
1909 }
1910
1911 /* Update the title _after_ the redraw so that if the redraw picks up a
1912 * commit reference in view->ref it'll be available here. */
1913 update_view_title(view);
1914
1915 check_pipe:
1916 if (ferror(view->pipe)) {
1917 report("Failed to read: %s", strerror(errno));
1918 goto end;
1919
1920 } else if (feof(view->pipe)) {
1921 report("");
1922 goto end;
1923 }
1924
1925 return TRUE;
1926
1927 alloc_error:
1928 report("Allocation failure");
1929
1930 end:
1931 end_update(view);
1932 return FALSE;
1933 }
1934
1935
1936 /*
1937 * View opening
1938 */
1939
1940 static void open_help_view(struct view *view)
1941 {
1942 char buf[BUFSIZ];
1943 int lines = ARRAY_SIZE(req_info) + 2;
1944 int i;
1945
1946 if (view->lines > 0)
1947 return;
1948
1949 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1950 if (!req_info[i].request)
1951 lines++;
1952
1953 view->line = calloc(lines, sizeof(*view->line));
1954 if (!view->line) {
1955 report("Allocation failure");
1956 return;
1957 }
1958
1959 view->ops->read(view, "Quick reference for tig keybindings:");
1960
1961 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1962 char *key;
1963
1964 if (!req_info[i].request) {
1965 view->ops->read(view, "");
1966 view->ops->read(view, req_info[i].help);
1967 continue;
1968 }
1969
1970 key = get_key(req_info[i].request);
1971 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1972 continue;
1973
1974 view->ops->read(view, buf);
1975 }
1976 }
1977
1978 enum open_flags {
1979 OPEN_DEFAULT = 0, /* Use default view switching. */
1980 OPEN_SPLIT = 1, /* Split current view. */
1981 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1982 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1983 };
1984
1985 static void
1986 open_view(struct view *prev, enum request request, enum open_flags flags)
1987 {
1988 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1989 bool split = !!(flags & OPEN_SPLIT);
1990 bool reload = !!(flags & OPEN_RELOAD);
1991 struct view *view = VIEW(request);
1992 int nviews = displayed_views();
1993 struct view *base_view = display[0];
1994
1995 if (view == prev && nviews == 1 && !reload) {
1996 report("Already in %s view", view->name);
1997 return;
1998 }
1999
2000 if (view == VIEW(REQ_VIEW_HELP)) {
2001 open_help_view(view);
2002
2003 } else if ((reload || strcmp(view->vid, view->id)) &&
2004 !begin_update(view)) {
2005 report("Failed to load %s view", view->name);
2006 return;
2007 }
2008
2009 if (split) {
2010 display[1] = view;
2011 if (!backgrounded)
2012 current_view = 1;
2013 } else {
2014 /* Maximize the current view. */
2015 memset(display, 0, sizeof(display));
2016 current_view = 0;
2017 display[current_view] = view;
2018 }
2019
2020 /* Resize the view when switching between split- and full-screen,
2021 * or when switching between two different full-screen views. */
2022 if (nviews != displayed_views() ||
2023 (nviews == 1 && base_view != display[0]))
2024 resize_display();
2025
2026 if (split && prev->lineno - prev->offset >= prev->height) {
2027 /* Take the title line into account. */
2028 int lines = prev->lineno - prev->offset - prev->height + 1;
2029
2030 /* Scroll the view that was split if the current line is
2031 * outside the new limited view. */
2032 do_scroll_view(prev, lines);
2033 }
2034
2035 if (prev && view != prev) {
2036 if (split && !backgrounded) {
2037 /* "Blur" the previous view. */
2038 update_view_title(prev);
2039 }
2040
2041 view->parent = prev;
2042 }
2043
2044 if (view->pipe && view->lines == 0) {
2045 /* Clear the old view and let the incremental updating refill
2046 * the screen. */
2047 wclear(view->win);
2048 report("");
2049 } else {
2050 redraw_view(view);
2051 report("");
2052 }
2053
2054 /* If the view is backgrounded the above calls to report()
2055 * won't redraw the view title. */
2056 if (backgrounded)
2057 update_view_title(view);
2058 }
2059
2060
2061 /*
2062 * User request switch noodle
2063 */
2064
2065 static int
2066 view_driver(struct view *view, enum request request)
2067 {
2068 int i;
2069
2070 switch (request) {
2071 case REQ_MOVE_UP:
2072 case REQ_MOVE_DOWN:
2073 case REQ_MOVE_PAGE_UP:
2074 case REQ_MOVE_PAGE_DOWN:
2075 case REQ_MOVE_FIRST_LINE:
2076 case REQ_MOVE_LAST_LINE:
2077 move_view(view, request);
2078 break;
2079
2080 case REQ_SCROLL_LINE_DOWN:
2081 case REQ_SCROLL_LINE_UP:
2082 case REQ_SCROLL_PAGE_DOWN:
2083 case REQ_SCROLL_PAGE_UP:
2084 scroll_view(view, request);
2085 break;
2086
2087 case REQ_VIEW_BLOB:
2088 if (!ref_blob[0]) {
2089 report("No file chosen, press 't' to open tree view");
2090 break;
2091 }
2092 /* Fall-through */
2093 case REQ_VIEW_MAIN:
2094 case REQ_VIEW_DIFF:
2095 case REQ_VIEW_LOG:
2096 case REQ_VIEW_TREE:
2097 case REQ_VIEW_HELP:
2098 case REQ_VIEW_PAGER:
2099 open_view(view, request, OPEN_DEFAULT);
2100 break;
2101
2102 case REQ_NEXT:
2103 case REQ_PREVIOUS:
2104 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2105
2106 if ((view == VIEW(REQ_VIEW_DIFF) &&
2107 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2108 (view == VIEW(REQ_VIEW_BLOB) &&
2109 view->parent == VIEW(REQ_VIEW_TREE))) {
2110 view = view->parent;
2111 move_view(view, request);
2112 if (view_is_displayed(view))
2113 update_view_title(view);
2114 } else {
2115 move_view(view, request);
2116 break;
2117 }
2118 /* Fall-through */
2119
2120 case REQ_ENTER:
2121 if (!view->lines) {
2122 report("Nothing to enter");
2123 break;
2124 }
2125 return view->ops->enter(view, &view->line[view->lineno]);
2126
2127 case REQ_VIEW_NEXT:
2128 {
2129 int nviews = displayed_views();
2130 int next_view = (current_view + 1) % nviews;
2131
2132 if (next_view == current_view) {
2133 report("Only one view is displayed");
2134 break;
2135 }
2136
2137 current_view = next_view;
2138 /* Blur out the title of the previous view. */
2139 update_view_title(view);
2140 report("");
2141 break;
2142 }
2143 case REQ_TOGGLE_LINENO:
2144 opt_line_number = !opt_line_number;
2145 redraw_display();
2146 break;
2147
2148 case REQ_TOGGLE_REV_GRAPH:
2149 opt_rev_graph = !opt_rev_graph;
2150 redraw_display();
2151 break;
2152
2153 case REQ_PROMPT:
2154 /* Always reload^Wrerun commands from the prompt. */
2155 open_view(view, opt_request, OPEN_RELOAD);
2156 break;
2157
2158 case REQ_SEARCH:
2159 case REQ_SEARCH_BACK:
2160 search_view(view, request);
2161 break;
2162
2163 case REQ_FIND_NEXT:
2164 case REQ_FIND_PREV:
2165 find_next(view, request);
2166 break;
2167
2168 case REQ_STOP_LOADING:
2169 for (i = 0; i < ARRAY_SIZE(views); i++) {
2170 view = &views[i];
2171 if (view->pipe)
2172 report("Stopped loading the %s view", view->name),
2173 end_update(view);
2174 }
2175 break;
2176
2177 case REQ_SHOW_VERSION:
2178 report("%s (built %s)", VERSION, __DATE__);
2179 return TRUE;
2180
2181 case REQ_SCREEN_RESIZE:
2182 resize_display();
2183 /* Fall-through */
2184 case REQ_SCREEN_REDRAW:
2185 redraw_display();
2186 break;
2187
2188 case REQ_NONE:
2189 doupdate();
2190 return TRUE;
2191
2192 case REQ_VIEW_CLOSE:
2193 /* XXX: Mark closed views by letting view->parent point to the
2194 * view itself. Parents to closed view should never be
2195 * followed. */
2196 if (view->parent &&
2197 view->parent->parent != view->parent) {
2198 memset(display, 0, sizeof(display));
2199 current_view = 0;
2200 display[current_view] = view->parent;
2201 view->parent = view;
2202 resize_display();
2203 redraw_display();
2204 break;
2205 }
2206 /* Fall-through */
2207 case REQ_QUIT:
2208 return FALSE;
2209
2210 default:
2211 /* An unknown key will show most commonly used commands. */
2212 report("Unknown key, press 'h' for help");
2213 return TRUE;
2214 }
2215
2216 return TRUE;
2217 }
2218
2219
2220 /*
2221 * Pager backend
2222 */
2223
2224 static bool
2225 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2226 {
2227 char *text = line->data;
2228 enum line_type type = line->type;
2229 int textlen = strlen(text);
2230 int attr;
2231
2232 wmove(view->win, lineno, 0);
2233
2234 if (selected) {
2235 type = LINE_CURSOR;
2236 wchgat(view->win, -1, 0, type, NULL);
2237 }
2238
2239 attr = get_line_attr(type);
2240 wattrset(view->win, attr);
2241
2242 if (opt_line_number || opt_tab_size < TABSIZE) {
2243 static char spaces[] = " ";
2244 int col_offset = 0, col = 0;
2245
2246 if (opt_line_number) {
2247 unsigned long real_lineno = view->offset + lineno + 1;
2248
2249 if (real_lineno == 1 ||
2250 (real_lineno % opt_num_interval) == 0) {
2251 wprintw(view->win, "%.*d", view->digits, real_lineno);
2252
2253 } else {
2254 waddnstr(view->win, spaces,
2255 MIN(view->digits, STRING_SIZE(spaces)));
2256 }
2257 waddstr(view->win, ": ");
2258 col_offset = view->digits + 2;
2259 }
2260
2261 while (text && col_offset + col < view->width) {
2262 int cols_max = view->width - col_offset - col;
2263 char *pos = text;
2264 int cols;
2265
2266 if (*text == '\t') {
2267 text++;
2268 assert(sizeof(spaces) > TABSIZE);
2269 pos = spaces;
2270 cols = opt_tab_size - (col % opt_tab_size);
2271
2272 } else {
2273 text = strchr(text, '\t');
2274 cols = line ? text - pos : strlen(pos);
2275 }
2276
2277 waddnstr(view->win, pos, MIN(cols, cols_max));
2278 col += cols;
2279 }
2280
2281 } else {
2282 int col = 0, pos = 0;
2283
2284 for (; pos < textlen && col < view->width; pos++, col++)
2285 if (text[pos] == '\t')
2286 col += TABSIZE - (col % TABSIZE) - 1;
2287
2288 waddnstr(view->win, text, pos);
2289 }
2290
2291 return TRUE;
2292 }
2293
2294 static bool
2295 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2296 {
2297 char refbuf[SIZEOF_STR];
2298 char *ref = NULL;
2299 FILE *pipe;
2300
2301 if (!string_format(refbuf, "git describe %s", commit_id))
2302 return TRUE;
2303
2304 pipe = popen(refbuf, "r");
2305 if (!pipe)
2306 return TRUE;
2307
2308 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2309 ref = chomp_string(ref);
2310 pclose(pipe);
2311
2312 if (!ref || !*ref)
2313 return TRUE;
2314
2315 /* This is the only fatal call, since it can "corrupt" the buffer. */
2316 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2317 return FALSE;
2318
2319 return TRUE;
2320 }
2321
2322 static void
2323 add_pager_refs(struct view *view, struct line *line)
2324 {
2325 char buf[SIZEOF_STR];
2326 char *commit_id = line->data + STRING_SIZE("commit ");
2327 struct ref **refs;
2328 size_t bufpos = 0, refpos = 0;
2329 const char *sep = "Refs: ";
2330 bool is_tag = FALSE;
2331
2332 assert(line->type == LINE_COMMIT);
2333
2334 refs = get_refs(commit_id);
2335 if (!refs) {
2336 if (view == VIEW(REQ_VIEW_DIFF))
2337 goto try_add_describe_ref;
2338 return;
2339 }
2340
2341 do {
2342 struct ref *ref = refs[refpos];
2343 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2344
2345 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2346 return;
2347 sep = ", ";
2348 if (ref->tag)
2349 is_tag = TRUE;
2350 } while (refs[refpos++]->next);
2351
2352 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2353 try_add_describe_ref:
2354 /* Add <tag>-g<commit_id> "fake" reference. */
2355 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2356 return;
2357 }
2358
2359 if (bufpos == 0)
2360 return;
2361
2362 if (!realloc_lines(view, view->line_size + 1))
2363 return;
2364
2365 line = &view->line[view->lines];
2366 line->data = strdup(buf);
2367 if (!line->data)
2368 return;
2369
2370 line->type = LINE_PP_REFS;
2371 view->lines++;
2372 }
2373
2374 static bool
2375 pager_read(struct view *view, char *data)
2376 {
2377 struct line *line = &view->line[view->lines];
2378
2379 line->data = strdup(data);
2380 if (!line->data)
2381 return FALSE;
2382
2383 line->type = get_line_type(line->data);
2384 view->lines++;
2385
2386 if (line->type == LINE_COMMIT &&
2387 (view == VIEW(REQ_VIEW_DIFF) ||
2388 view == VIEW(REQ_VIEW_LOG)))
2389 add_pager_refs(view, line);
2390
2391 return TRUE;
2392 }
2393
2394 static bool
2395 pager_enter(struct view *view, struct line *line)
2396 {
2397 int split = 0;
2398
2399 if (line->type == LINE_COMMIT &&
2400 (view == VIEW(REQ_VIEW_LOG) ||
2401 view == VIEW(REQ_VIEW_PAGER))) {
2402 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2403 split = 1;
2404 }
2405
2406 /* Always scroll the view even if it was split. That way
2407 * you can use Enter to scroll through the log view and
2408 * split open each commit diff. */
2409 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2410
2411 /* FIXME: A minor workaround. Scrolling the view will call report("")
2412 * but if we are scrolling a non-current view this won't properly
2413 * update the view title. */
2414 if (split)
2415 update_view_title(view);
2416
2417 return TRUE;
2418 }
2419
2420 static bool
2421 pager_grep(struct view *view, struct line *line)
2422 {
2423 regmatch_t pmatch;
2424 char *text = line->data;
2425
2426 if (!*text)
2427 return FALSE;
2428
2429 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2430 return FALSE;
2431
2432 return TRUE;
2433 }
2434
2435 static void
2436 pager_select(struct view *view, struct line *line)
2437 {
2438 if (line->type == LINE_COMMIT) {
2439 char *text = line->data;
2440
2441 string_copy(view->ref, text + STRING_SIZE("commit "));
2442 string_copy(ref_commit, view->ref);
2443 }
2444 }
2445
2446 static struct view_ops pager_ops = {
2447 "line",
2448 pager_draw,
2449 pager_read,
2450 pager_enter,
2451 pager_grep,
2452 pager_select,
2453 };
2454
2455
2456 /*
2457 * Tree backend
2458 */
2459
2460 /* Parse output from git-ls-tree(1):
2461 *
2462 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2463 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2464 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2465 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2466 */
2467
2468 #define SIZEOF_TREE_ATTR \
2469 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2470
2471 #define TREE_UP_FORMAT "040000 tree %s\t.."
2472
2473 static int
2474 tree_compare_entry(enum line_type type1, char *name1,
2475 enum line_type type2, char *name2)
2476 {
2477 if (type1 != type2) {
2478 if (type1 == LINE_TREE_DIR)
2479 return -1;
2480 return 1;
2481 }
2482
2483 return strcmp(name1, name2);
2484 }
2485
2486 static bool
2487 tree_read(struct view *view, char *text)
2488 {
2489 size_t textlen = strlen(text);
2490 char buf[SIZEOF_STR];
2491 unsigned long pos;
2492 enum line_type type;
2493 bool first_read = view->lines == 0;
2494
2495 if (textlen <= SIZEOF_TREE_ATTR)
2496 return FALSE;
2497
2498 type = text[STRING_SIZE("100644 ")] == 't'
2499 ? LINE_TREE_DIR : LINE_TREE_FILE;
2500
2501 if (first_read) {
2502 /* Add path info line */
2503 if (string_format(buf, "Directory path /%s", opt_path) &&
2504 realloc_lines(view, view->line_size + 1) &&
2505 pager_read(view, buf))
2506 view->line[view->lines - 1].type = LINE_DEFAULT;
2507 else
2508 return FALSE;
2509
2510 /* Insert "link" to parent directory. */
2511 if (*opt_path &&
2512 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2513 realloc_lines(view, view->line_size + 1) &&
2514 pager_read(view, buf))
2515 view->line[view->lines - 1].type = LINE_TREE_DIR;
2516 else if (*opt_path)
2517 return FALSE;
2518 }
2519
2520 /* Strip the path part ... */
2521 if (*opt_path) {
2522 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2523 size_t striplen = strlen(opt_path);
2524 char *path = text + SIZEOF_TREE_ATTR;
2525
2526 if (pathlen > striplen)
2527 memmove(path, path + striplen,
2528 pathlen - striplen + 1);
2529 }
2530
2531 /* Skip "Directory ..." and ".." line. */
2532 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2533 struct line *line = &view->line[pos];
2534 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2535 char *path2 = text + SIZEOF_TREE_ATTR;
2536 int cmp = tree_compare_entry(line->type, path1, type, path2);
2537
2538 if (cmp <= 0)
2539 continue;
2540
2541 text = strdup(text);
2542 if (!text)
2543 return FALSE;
2544
2545 if (view->lines > pos)
2546 memmove(&view->line[pos + 1], &view->line[pos],
2547 (view->lines - pos) * sizeof(*line));
2548
2549 line = &view->line[pos];
2550 line->data = text;
2551 line->type = type;
2552 view->lines++;
2553 return TRUE;
2554 }
2555
2556 if (!pager_read(view, text))
2557 return FALSE;
2558
2559 /* Move the current line to the first tree entry. */
2560 if (first_read)
2561 view->lineno++;
2562
2563 view->line[view->lines - 1].type = type;
2564 return TRUE;
2565 }
2566
2567 static bool
2568 tree_enter(struct view *view, struct line *line)
2569 {
2570 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2571 enum request request;
2572
2573 switch (line->type) {
2574 case LINE_TREE_DIR:
2575 /* Depending on whether it is a subdir or parent (updir?) link
2576 * mangle the path buffer. */
2577 if (line == &view->line[1] && *opt_path) {
2578 size_t path_len = strlen(opt_path);
2579 char *dirsep = opt_path + path_len - 1;
2580
2581 while (dirsep > opt_path && dirsep[-1] != '/')
2582 dirsep--;
2583
2584 dirsep[0] = 0;
2585
2586 } else {
2587 size_t pathlen = strlen(opt_path);
2588 size_t origlen = pathlen;
2589 char *data = line->data;
2590 char *basename = data + SIZEOF_TREE_ATTR;
2591
2592 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2593 opt_path[origlen] = 0;
2594 return TRUE;
2595 }
2596 }
2597
2598 /* Trees and subtrees share the same ID, so they are not not
2599 * unique like blobs. */
2600 flags |= OPEN_RELOAD;
2601 request = REQ_VIEW_TREE;
2602 break;
2603
2604 case LINE_TREE_FILE:
2605 request = REQ_VIEW_BLOB;
2606 break;
2607
2608 default:
2609 return TRUE;
2610 }
2611
2612 open_view(view, request, flags);
2613
2614 return TRUE;
2615 }
2616
2617 static void
2618 tree_select(struct view *view, struct line *line)
2619 {
2620 char *text = line->data;
2621
2622 text += STRING_SIZE("100644 blob ");
2623
2624 if (line->type == LINE_TREE_FILE) {
2625 string_ncopy(ref_blob, text, 40);
2626 /* Also update the blob view's ref, since all there must always
2627 * be in sync. */
2628 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2629
2630 } else if (line->type != LINE_TREE_DIR) {
2631 return;
2632 }
2633
2634 string_ncopy(view->ref, text, 40);
2635 }
2636
2637 static struct view_ops tree_ops = {
2638 "file",
2639 pager_draw,
2640 tree_read,
2641 tree_enter,
2642 pager_grep,
2643 tree_select,
2644 };
2645
2646 static bool
2647 blob_read(struct view *view, char *line)
2648 {
2649 bool state = pager_read(view, line);
2650
2651 if (state == TRUE)
2652 view->line[view->lines - 1].type = LINE_DEFAULT;
2653
2654 return state;
2655 }
2656
2657 static struct view_ops blob_ops = {
2658 "line",
2659 pager_draw,
2660 blob_read,
2661 pager_enter,
2662 pager_grep,
2663 pager_select,
2664 };
2665
2666
2667 /*
2668 * Revision graph
2669 */
2670
2671 struct commit {
2672 char id[SIZEOF_REV]; /* SHA1 ID. */
2673 char title[75]; /* First line of the commit message. */
2674 char author[75]; /* Author of the commit. */
2675 struct tm time; /* Date from the author ident. */
2676 struct ref **refs; /* Repository references. */
2677 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2678 size_t graph_size; /* The width of the graph array. */
2679 };
2680
2681 /* Size of rev graph with no "padding" columns */
2682 #define SIZEOF_REVITEMS (SIZEOF_REVGRAPH - (SIZEOF_REVGRAPH / 2))
2683
2684 struct rev_stack {
2685 struct rev_stack *prev, *next, *parents;
2686 char rev[SIZEOF_REVITEMS][SIZEOF_REV];
2687 size_t size;
2688 struct commit *commit;
2689 size_t pos;
2690 };
2691
2692 /* Parents of the commit being visualized. */
2693 static struct rev_stack graph_parents[3];
2694
2695 /* The current stack of revisions on the graph. */
2696 static struct rev_stack graph_stacks[3] = {
2697 { &graph_stacks[2], &graph_stacks[1], &graph_parents[0] },
2698 { &graph_stacks[0], &graph_stacks[2], &graph_parents[1] },
2699 { &graph_stacks[1], &graph_stacks[0], &graph_parents[2] },
2700 };
2701
2702 static inline bool
2703 graph_parent_is_merge(struct rev_stack *graph)
2704 {
2705 return graph->parents->size > 1;
2706 }
2707
2708 static inline void
2709 append_to_rev_graph(struct rev_stack *stack, chtype symbol)
2710 {
2711 if (stack->commit->graph_size < ARRAY_SIZE(stack->commit->graph) - 1)
2712 stack->commit->graph[stack->commit->graph_size++] = symbol;
2713 }
2714
2715 static void
2716 done_rev_graph(struct rev_stack *graph)
2717 {
2718 if (graph_parent_is_merge(graph) &&
2719 graph->pos < graph->size - 1 &&
2720 graph->next->size == graph->size + graph->parents->size - 1) {
2721 size_t i = graph->pos + graph->parents->size - 1;
2722
2723 graph->commit->graph_size = i * 2;
2724 while (i < graph->next->size - 1) {
2725 append_to_rev_graph(graph, ' ');
2726 append_to_rev_graph(graph, '\\');
2727 i++;
2728 }
2729 }
2730
2731 graph->size = graph->pos = 0;
2732 graph->commit = NULL;
2733 memset(graph->parents, 0, sizeof(*graph->parents));
2734 }
2735
2736 static void
2737 push_rev_stack(struct rev_stack *stack, char *parent)
2738 {
2739 /* Combine duplicate parents lines. */
2740 if (stack->size > 0 &&
2741 !strncmp(stack->rev[stack->size - 1], parent, SIZEOF_REV))
2742 return;
2743
2744 if (stack->size < SIZEOF_REVITEMS) {
2745 string_ncopy(stack->rev[stack->size++], parent, SIZEOF_REV);
2746 }
2747 }
2748
2749 static void
2750 draw_rev_graph(struct rev_stack *graph)
2751 {
2752 chtype symbol, separator, line;
2753 size_t i;
2754
2755 /* Place the symbol for this commit. */
2756 if (graph->parents->size == 0)
2757 symbol = REVGRAPH_INIT;
2758 else if (graph->parents->size > 1)
2759 symbol = REVGRAPH_MERGE;
2760 else if (graph->pos >= graph->size)
2761 symbol = REVGRAPH_BRANCH;
2762 else
2763 symbol = REVGRAPH_COMMIT;
2764
2765 separator = ' ';
2766 line = REVGRAPH_LINE;
2767
2768 for (i = 0; i < graph->pos; i++) {
2769 append_to_rev_graph(graph, line);
2770 if (graph_parent_is_merge(graph->prev) &&
2771 graph->prev->pos == i) {
2772 separator = '`';
2773 line = '.';
2774 }
2775 append_to_rev_graph(graph, separator);
2776 }
2777
2778 append_to_rev_graph(graph, symbol);
2779
2780 if (graph->prev->size > graph->size) {
2781 separator = '\'';
2782 line = ' ';
2783 } else {
2784 separator = ' ';
2785 line = REVGRAPH_LINE;
2786 }
2787 i++;
2788
2789 for (; i < graph->size; i++) {
2790 append_to_rev_graph(graph, separator);
2791 append_to_rev_graph(graph, line);
2792 if (graph_parent_is_merge(graph->prev)) {
2793 if (i < graph->prev->pos + graph->parents->size) {
2794 separator = '`';
2795 line = '.';
2796 }
2797 }
2798 if (graph->prev->size > graph->size) {
2799 separator = '/';
2800 line = ' ';
2801 }
2802 }
2803
2804 if (graph->prev->size > graph->size) {
2805 append_to_rev_graph(graph, separator);
2806 if (line != ' ')
2807 append_to_rev_graph(graph, line);
2808 }
2809 }
2810
2811 void
2812 update_rev_graph(struct rev_stack *graph)
2813 {
2814 size_t i;
2815
2816 /* First traverse all lines of revisions up to the active one. */
2817 for (graph->pos = 0; graph->pos < graph->size; graph->pos++) {
2818 if (!strcmp(graph->rev[graph->pos], graph->commit->id))
2819 break;
2820
2821 push_rev_stack(graph->next, graph->rev[graph->pos]);
2822 }
2823
2824 for (i = 0; i < graph->parents->size; i++)
2825 push_rev_stack(graph->next, graph->parents->rev[i]);
2826
2827 /* FIXME: Moving branches left and right when collapsing a branch. */
2828 for (i = graph->pos + 1; i < graph->size; i++)
2829 push_rev_stack(graph->next, graph->rev[i]);
2830
2831 draw_rev_graph(graph);
2832 done_rev_graph(graph->prev);
2833 }
2834
2835
2836 /*
2837 * Main view backend
2838 */
2839
2840 static bool
2841 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2842 {
2843 char buf[DATE_COLS + 1];
2844 struct commit *commit = line->data;
2845 enum line_type type;
2846 int col = 0;
2847 size_t timelen;
2848 size_t authorlen;
2849 int trimmed = 1;
2850
2851 if (!*commit->author)
2852 return FALSE;
2853
2854 wmove(view->win, lineno, col);
2855
2856 if (selected) {
2857 type = LINE_CURSOR;
2858 wattrset(view->win, get_line_attr(type));
2859 wchgat(view->win, -1, 0, type, NULL);
2860
2861 } else {
2862 type = LINE_MAIN_COMMIT;
2863 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2864 }
2865
2866 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2867 waddnstr(view->win, buf, timelen);
2868 waddstr(view->win, " ");
2869
2870 col += DATE_COLS;
2871 wmove(view->win, lineno, col);
2872 if (type != LINE_CURSOR)
2873 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2874
2875 if (opt_utf8) {
2876 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2877 } else {
2878 authorlen = strlen(commit->author);
2879 if (authorlen > AUTHOR_COLS - 2) {
2880 authorlen = AUTHOR_COLS - 2;
2881 trimmed = 1;
2882 }
2883 }
2884
2885 if (trimmed) {
2886 waddnstr(view->win, commit->author, authorlen);
2887 if (type != LINE_CURSOR)
2888 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2889 waddch(view->win, '~');
2890 } else {
2891 waddstr(view->win, commit->author);
2892 }
2893
2894 col += AUTHOR_COLS;
2895 if (type != LINE_CURSOR)
2896 wattrset(view->win, A_NORMAL);
2897
2898 if (opt_rev_graph && commit->graph_size) {
2899 size_t i;
2900
2901 wmove(view->win, lineno, col);
2902 /* Using waddch() instead of waddnstr() ensures that
2903 * they'll be rendered correctly for the cursor line. */
2904 for (i = 0; i < commit->graph_size; i++)
2905 waddch(view->win, commit->graph[i]);
2906
2907 col += commit->graph_size + 1;
2908 }
2909
2910 wmove(view->win, lineno, col);
2911
2912 if (commit->refs) {
2913 size_t i = 0;
2914
2915 do {
2916 if (type == LINE_CURSOR)
2917 ;
2918 else if (commit->refs[i]->tag)
2919 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2920 else
2921 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2922 waddstr(view->win, "[");
2923 waddstr(view->win, commit->refs[i]->name);
2924 waddstr(view->win, "]");
2925 if (type != LINE_CURSOR)
2926 wattrset(view->win, A_NORMAL);
2927 waddstr(view->win, " ");
2928 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2929 } while (commit->refs[i++]->next);
2930 }
2931
2932 if (type != LINE_CURSOR)
2933 wattrset(view->win, get_line_attr(type));
2934
2935 {
2936 int titlelen = strlen(commit->title);
2937
2938 if (col + titlelen > view->width)
2939 titlelen = view->width - col;
2940
2941 waddnstr(view->win, commit->title, titlelen);
2942 }
2943
2944 return TRUE;
2945 }
2946
2947 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2948 static bool
2949 main_read(struct view *view, char *line)
2950 {
2951 static struct rev_stack *graph = graph_stacks;
2952 enum line_type type = get_line_type(line);
2953 struct commit *commit = view->lines
2954 ? view->line[view->lines - 1].data : NULL;
2955
2956 switch (type) {
2957 case LINE_COMMIT:
2958 commit = calloc(1, sizeof(struct commit));
2959 if (!commit)
2960 return FALSE;
2961
2962 line += STRING_SIZE("commit ");
2963
2964 view->line[view->lines++].data = commit;
2965 string_copy(commit->id, line);
2966 commit->refs = get_refs(commit->id);
2967 graph->commit = commit;
2968 break;
2969
2970 case LINE_PARENT:
2971 if (commit) {
2972 line += STRING_SIZE("parent ");
2973 push_rev_stack(graph->parents, line);
2974 }
2975 break;
2976
2977 case LINE_AUTHOR:
2978 {
2979 char *ident = line + STRING_SIZE("author ");
2980 char *end = strchr(ident, '<');
2981
2982 if (!commit)
2983 break;
2984
2985 update_rev_graph(graph);
2986 graph = graph->next;
2987
2988 if (end) {
2989 char *email = end + 1;
2990
2991 for (; end > ident && isspace(end[-1]); end--) ;
2992
2993 if (end == ident && *email) {
2994 ident = email;
2995 end = strchr(ident, '>');
2996 for (; end > ident && isspace(end[-1]); end--) ;
2997 }
2998 *end = 0;
2999 }
3000
3001 /* End is NULL or ident meaning there's no author. */
3002 if (end <= ident)
3003 ident = "Unknown";
3004
3005 string_copy(commit->author, ident);
3006
3007 /* Parse epoch and timezone */
3008 if (end) {
3009 char *secs = strchr(end + 1, '>');
3010 char *zone;
3011 time_t time;
3012
3013 if (!secs || secs[1] != ' ')
3014 break;
3015
3016 secs += 2;
3017 time = (time_t) atol(secs);
3018 zone = strchr(secs, ' ');
3019 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
3020 long tz;
3021
3022 zone++;
3023 tz = ('0' - zone[1]) * 60 * 60 * 10;
3024 tz += ('0' - zone[2]) * 60 * 60;
3025 tz += ('0' - zone[3]) * 60;
3026 tz += ('0' - zone[4]) * 60;
3027
3028 if (zone[0] == '-')
3029 tz = -tz;
3030
3031 time -= tz;
3032 }
3033 gmtime_r(&time, &commit->time);
3034 }
3035 break;
3036 }
3037 default:
3038 if (!commit)
3039 break;
3040
3041 /* Fill in the commit title if it has not already been set. */
3042 if (commit->title[0])
3043 break;
3044
3045 /* Require titles to start with a non-space character at the
3046 * offset used by git log. */
3047 /* FIXME: More gracefull handling of titles; append "..." to
3048 * shortened titles, etc. */
3049 if (strncmp(line, " ", 4) ||
3050 isspace(line[4]))
3051 break;
3052
3053 string_copy(commit->title, line + 4);
3054 }
3055
3056 return TRUE;
3057 }
3058
3059 static bool
3060 main_enter(struct view *view, struct line *line)
3061 {
3062 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
3063
3064 open_view(view, REQ_VIEW_DIFF, flags);
3065 return TRUE;
3066 }
3067
3068 static bool
3069 main_grep(struct view *view, struct line *line)
3070 {
3071 struct commit *commit = line->data;
3072 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
3073 char buf[DATE_COLS + 1];
3074 regmatch_t pmatch;
3075
3076 for (state = S_TITLE; state < S_END; state++) {
3077 char *text;
3078
3079 switch (state) {
3080 case S_TITLE: text = commit->title; break;
3081 case S_AUTHOR: text = commit->author; break;
3082 case S_DATE:
3083 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
3084 continue;
3085 text = buf;
3086 break;
3087
3088 default:
3089 return FALSE;
3090 }
3091
3092 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
3093 return TRUE;
3094 }
3095
3096 return FALSE;
3097 }
3098
3099 static void
3100 main_select(struct view *view, struct line *line)
3101 {
3102 struct commit *commit = line->data;
3103
3104 string_copy(view->ref, commit->id);
3105 string_copy(ref_commit, view->ref);
3106 }
3107
3108 static struct view_ops main_ops = {
3109 "commit",
3110 main_draw,
3111 main_read,
3112 main_enter,
3113 main_grep,
3114 main_select,
3115 };
3116
3117
3118 /*
3119 * Unicode / UTF-8 handling
3120 *
3121 * NOTE: Much of the following code for dealing with unicode is derived from
3122 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
3123 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
3124 */
3125
3126 /* I've (over)annotated a lot of code snippets because I am not entirely
3127 * confident that the approach taken by this small UTF-8 interface is correct.
3128 * --jonas */
3129
3130 static inline int
3131 unicode_width(unsigned long c)
3132 {
3133 if (c >= 0x1100 &&
3134 (c <= 0x115f /* Hangul Jamo */
3135 || c == 0x2329
3136 || c == 0x232a
3137 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
3138 /* CJK ... Yi */
3139 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
3140 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
3141 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
3142 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
3143 || (c >= 0xffe0 && c <= 0xffe6)
3144 || (c >= 0x20000 && c <= 0x2fffd)
3145 || (c >= 0x30000 && c <= 0x3fffd)))
3146 return 2;
3147
3148 return 1;
3149 }
3150
3151 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
3152 * Illegal bytes are set one. */
3153 static const unsigned char utf8_bytes[256] = {
3154 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,
3155 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,
3156 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,
3157 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,
3158 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,
3159 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,
3160 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,
3161 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,
3162 };
3163
3164 /* Decode UTF-8 multi-byte representation into a unicode character. */
3165 static inline unsigned long
3166 utf8_to_unicode(const char *string, size_t length)
3167 {
3168 unsigned long unicode;
3169
3170 switch (length) {
3171 case 1:
3172 unicode = string[0];
3173 break;
3174 case 2:
3175 unicode = (string[0] & 0x1f) << 6;
3176 unicode += (string[1] & 0x3f);
3177 break;
3178 case 3:
3179 unicode = (string[0] & 0x0f) << 12;
3180 unicode += ((string[1] & 0x3f) << 6);
3181 unicode += (string[2] & 0x3f);
3182 break;
3183 case 4:
3184 unicode = (string[0] & 0x0f) << 18;
3185 unicode += ((string[1] & 0x3f) << 12);
3186 unicode += ((string[2] & 0x3f) << 6);
3187 unicode += (string[3] & 0x3f);
3188 break;
3189 case 5:
3190 unicode = (string[0] & 0x0f) << 24;
3191 unicode += ((string[1] & 0x3f) << 18);
3192 unicode += ((string[2] & 0x3f) << 12);
3193 unicode += ((string[3] & 0x3f) << 6);
3194 unicode += (string[4] & 0x3f);
3195 break;
3196 case 6:
3197 unicode = (string[0] & 0x01) << 30;
3198 unicode += ((string[1] & 0x3f) << 24);
3199 unicode += ((string[2] & 0x3f) << 18);
3200 unicode += ((string[3] & 0x3f) << 12);
3201 unicode += ((string[4] & 0x3f) << 6);
3202 unicode += (string[5] & 0x3f);
3203 break;
3204 default:
3205 die("Invalid unicode length");
3206 }
3207
3208 /* Invalid characters could return the special 0xfffd value but NUL
3209 * should be just as good. */
3210 return unicode > 0xffff ? 0 : unicode;
3211 }
3212
3213 /* Calculates how much of string can be shown within the given maximum width
3214 * and sets trimmed parameter to non-zero value if all of string could not be
3215 * shown.
3216 *
3217 * Additionally, adds to coloffset how many many columns to move to align with
3218 * the expected position. Takes into account how multi-byte and double-width
3219 * characters will effect the cursor position.
3220 *
3221 * Returns the number of bytes to output from string to satisfy max_width. */
3222 static size_t
3223 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3224 {
3225 const char *start = string;
3226 const char *end = strchr(string, '\0');
3227 size_t mbwidth = 0;
3228 size_t width = 0;
3229
3230 *trimmed = 0;
3231
3232 while (string < end) {
3233 int c = *(unsigned char *) string;
3234 unsigned char bytes = utf8_bytes[c];
3235 size_t ucwidth;
3236 unsigned long unicode;
3237
3238 if (string + bytes > end)
3239 break;
3240
3241 /* Change representation to figure out whether
3242 * it is a single- or double-width character. */
3243
3244 unicode = utf8_to_unicode(string, bytes);
3245 /* FIXME: Graceful handling of invalid unicode character. */
3246 if (!unicode)
3247 break;
3248
3249 ucwidth = unicode_width(unicode);
3250 width += ucwidth;
3251 if (width > max_width) {
3252 *trimmed = 1;
3253 break;
3254 }
3255
3256 /* The column offset collects the differences between the
3257 * number of bytes encoding a character and the number of
3258 * columns will be used for rendering said character.
3259 *
3260 * So if some character A is encoded in 2 bytes, but will be
3261 * represented on the screen using only 1 byte this will and up
3262 * adding 1 to the multi-byte column offset.
3263 *
3264 * Assumes that no double-width character can be encoding in
3265 * less than two bytes. */
3266 if (bytes > ucwidth)
3267 mbwidth += bytes - ucwidth;
3268
3269 string += bytes;
3270 }
3271
3272 *coloffset += mbwidth;
3273
3274 return string - start;
3275 }
3276
3277
3278 /*
3279 * Status management
3280 */
3281
3282 /* Whether or not the curses interface has been initialized. */
3283 static bool cursed = FALSE;
3284
3285 /* The status window is used for polling keystrokes. */
3286 static WINDOW *status_win;
3287
3288 /* Update status and title window. */
3289 static void
3290 report(const char *msg, ...)
3291 {
3292 static bool empty = TRUE;
3293 struct view *view = display[current_view];
3294
3295 if (!empty || *msg) {
3296 va_list args;
3297
3298 va_start(args, msg);
3299
3300 werase(status_win);
3301 wmove(status_win, 0, 0);
3302 if (*msg) {
3303 vwprintw(status_win, msg, args);
3304 empty = FALSE;
3305 } else {
3306 empty = TRUE;
3307 }
3308 wrefresh(status_win);
3309
3310 va_end(args);
3311 }
3312
3313 update_view_title(view);
3314 update_display_cursor();
3315 }
3316
3317 /* Controls when nodelay should be in effect when polling user input. */
3318 static void
3319 set_nonblocking_input(bool loading)
3320 {
3321 static unsigned int loading_views;
3322
3323 if ((loading == FALSE && loading_views-- == 1) ||
3324 (loading == TRUE && loading_views++ == 0))
3325 nodelay(status_win, loading);
3326 }
3327
3328 static void
3329 init_display(void)
3330 {
3331 int x, y;
3332
3333 /* Initialize the curses library */
3334 if (isatty(STDIN_FILENO)) {
3335 cursed = !!initscr();
3336 } else {
3337 /* Leave stdin and stdout alone when acting as a pager. */
3338 FILE *io = fopen("/dev/tty", "r+");
3339
3340 if (!io)
3341 die("Failed to open /dev/tty");
3342 cursed = !!newterm(NULL, io, io);
3343 }
3344
3345 if (!cursed)
3346 die("Failed to initialize curses");
3347
3348 nonl(); /* Tell curses not to do NL->CR/NL on output */
3349 cbreak(); /* Take input chars one at a time, no wait for \n */
3350 noecho(); /* Don't echo input */
3351 leaveok(stdscr, TRUE);
3352
3353 if (has_colors())
3354 init_colors();
3355
3356 getmaxyx(stdscr, y, x);
3357 status_win = newwin(1, 0, y - 1, 0);
3358 if (!status_win)
3359 die("Failed to create status window");
3360
3361 /* Enable keyboard mapping */
3362 keypad(status_win, TRUE);
3363 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3364 }
3365
3366 static char *
3367 read_prompt(const char *prompt)
3368 {
3369 enum { READING, STOP, CANCEL } status = READING;
3370 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3371 int pos = 0;
3372
3373 while (status == READING) {
3374 struct view *view;
3375 int i, key;
3376
3377 foreach_view (view, i)
3378 update_view(view);
3379
3380 report("%s%.*s", prompt, pos, buf);
3381 /* Refresh, accept single keystroke of input */
3382 key = wgetch(status_win);
3383 switch (key) {
3384 case KEY_RETURN:
3385 case KEY_ENTER:
3386 case '\n':
3387 status = pos ? STOP : CANCEL;
3388 break;
3389
3390 case KEY_BACKSPACE:
3391 if (pos > 0)
3392 pos--;
3393 else
3394 status = CANCEL;
3395 break;
3396
3397 case KEY_ESC:
3398 status = CANCEL;
3399 break;
3400
3401 case ERR:
3402 break;
3403
3404 default:
3405 if (pos >= sizeof(buf)) {
3406 report("Input string too long");
3407 return NULL;
3408 }
3409
3410 if (isprint(key))
3411 buf[pos++] = (char) key;
3412 }
3413 }
3414
3415 if (status == CANCEL) {
3416 /* Clear the status window */
3417 report("");
3418 return NULL;
3419 }
3420
3421 buf[pos++] = 0;
3422
3423 return buf;
3424 }
3425
3426 /*
3427 * Repository references
3428 */
3429
3430 static struct ref *refs;
3431 static size_t refs_size;
3432
3433 /* Id <-> ref store */
3434 static struct ref ***id_refs;
3435 static size_t id_refs_size;
3436
3437 static struct ref **
3438 get_refs(char *id)
3439 {
3440 struct ref ***tmp_id_refs;
3441 struct ref **ref_list = NULL;
3442 size_t ref_list_size = 0;
3443 size_t i;
3444
3445 for (i = 0; i < id_refs_size; i++)
3446 if (!strcmp(id, id_refs[i][0]->id))
3447 return id_refs[i];
3448
3449 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3450 if (!tmp_id_refs)
3451 return NULL;
3452
3453 id_refs = tmp_id_refs;
3454
3455 for (i = 0; i < refs_size; i++) {
3456 struct ref **tmp;
3457
3458 if (strcmp(id, refs[i].id))
3459 continue;
3460
3461 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3462 if (!tmp) {
3463 if (ref_list)
3464 free(ref_list);
3465 return NULL;
3466 }
3467
3468 ref_list = tmp;
3469 if (ref_list_size > 0)
3470 ref_list[ref_list_size - 1]->next = 1;
3471 ref_list[ref_list_size] = &refs[i];
3472
3473 /* XXX: The properties of the commit chains ensures that we can
3474 * safely modify the shared ref. The repo references will
3475 * always be similar for the same id. */
3476 ref_list[ref_list_size]->next = 0;
3477 ref_list_size++;
3478 }
3479
3480 if (ref_list)
3481 id_refs[id_refs_size++] = ref_list;
3482
3483 return ref_list;
3484 }
3485
3486 static int
3487 read_ref(char *id, int idlen, char *name, int namelen)
3488 {
3489 struct ref *ref;
3490 bool tag = FALSE;
3491
3492 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3493 /* Commits referenced by tags has "^{}" appended. */
3494 if (name[namelen - 1] != '}')
3495 return OK;
3496
3497 while (namelen > 0 && name[namelen] != '^')
3498 namelen--;
3499
3500 tag = TRUE;
3501 namelen -= STRING_SIZE("refs/tags/");
3502 name += STRING_SIZE("refs/tags/");
3503
3504 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3505 namelen -= STRING_SIZE("refs/heads/");
3506 name += STRING_SIZE("refs/heads/");
3507
3508 } else if (!strcmp(name, "HEAD")) {
3509 return OK;
3510 }
3511
3512 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3513 if (!refs)
3514 return ERR;
3515
3516 ref = &refs[refs_size++];
3517 ref->name = malloc(namelen + 1);
3518 if (!ref->name)
3519 return ERR;
3520
3521 strncpy(ref->name, name, namelen);
3522 ref->name[namelen] = 0;
3523 ref->tag = tag;
3524 string_copy(ref->id, id);
3525
3526 return OK;
3527 }
3528
3529 static int
3530 load_refs(void)
3531 {
3532 const char *cmd_env = getenv("TIG_LS_REMOTE");
3533 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3534
3535 return read_properties(popen(cmd, "r"), "\t", read_ref);
3536 }
3537
3538 static int
3539 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3540 {
3541 if (!strcmp(name, "i18n.commitencoding"))
3542 string_copy(opt_encoding, value);
3543
3544 return OK;
3545 }
3546
3547 static int
3548 load_repo_config(void)
3549 {
3550 return read_properties(popen("git repo-config --list", "r"),
3551 "=", read_repo_config_option);
3552 }
3553
3554 static int
3555 read_properties(FILE *pipe, const char *separators,
3556 int (*read_property)(char *, int, char *, int))
3557 {
3558 char buffer[BUFSIZ];
3559 char *name;
3560 int state = OK;
3561
3562 if (!pipe)
3563 return ERR;
3564
3565 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3566 char *value;
3567 size_t namelen;
3568 size_t valuelen;
3569
3570 name = chomp_string(name);
3571 namelen = strcspn(name, separators);
3572
3573 if (name[namelen]) {
3574 name[namelen] = 0;
3575 value = chomp_string(name + namelen + 1);
3576 valuelen = strlen(value);
3577
3578 } else {
3579 value = "";
3580 valuelen = 0;
3581 }
3582
3583 state = read_property(name, namelen, value, valuelen);
3584 }
3585
3586 if (state != ERR && ferror(pipe))
3587 state = ERR;
3588
3589 pclose(pipe);
3590
3591 return state;
3592 }
3593
3594
3595 /*
3596 * Main
3597 */
3598
3599 static void __NORETURN
3600 quit(int sig)
3601 {
3602 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3603 if (cursed)
3604 endwin();
3605 exit(0);
3606 }
3607
3608 static void __NORETURN
3609 die(const char *err, ...)
3610 {
3611 va_list args;
3612
3613 endwin();
3614
3615 va_start(args, err);
3616 fputs("tig: ", stderr);
3617 vfprintf(stderr, err, args);
3618 fputs("\n", stderr);
3619 va_end(args);
3620
3621 exit(1);
3622 }
3623
3624 int
3625 main(int argc, char *argv[])
3626 {
3627 struct view *view;
3628 enum request request;
3629 size_t i;
3630
3631 signal(SIGINT, quit);
3632
3633 if (setlocale(LC_ALL, "")) {
3634 string_copy(opt_codeset, nl_langinfo(CODESET));
3635 }
3636
3637 if (load_options() == ERR)
3638 die("Failed to load user config.");
3639
3640 /* Load the repo config file so options can be overwritten from
3641 * the command line. */
3642 if (load_repo_config() == ERR)
3643 die("Failed to load repo config.");
3644
3645 if (!parse_options(argc, argv))
3646 return 0;
3647
3648 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3649 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3650 if (opt_iconv == ICONV_NONE)
3651 die("Failed to initialize character set conversion");
3652 }
3653
3654 if (load_refs() == ERR)
3655 die("Failed to load refs.");
3656
3657 /* Require a git repository unless when running in pager mode. */
3658 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3659 die("Not a git repository");
3660
3661 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3662 view->cmd_env = getenv(view->cmd_env);
3663
3664 request = opt_request;
3665
3666 init_display();
3667
3668 while (view_driver(display[current_view], request)) {
3669 int key;
3670 int i;
3671
3672 foreach_view (view, i)
3673 update_view(view);
3674
3675 /* Refresh, accept single keystroke of input */
3676 key = wgetch(status_win);
3677
3678 request = get_keybinding(display[current_view]->keymap, key);
3679
3680 /* Some low-level request handling. This keeps access to
3681 * status_win restricted. */
3682 switch (request) {
3683 case REQ_PROMPT:
3684 {
3685 char *cmd = read_prompt(":");
3686
3687 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3688 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3689 opt_request = REQ_VIEW_DIFF;
3690 } else {
3691 opt_request = REQ_VIEW_PAGER;
3692 }
3693 break;
3694 }
3695
3696 request = REQ_NONE;
3697 break;
3698 }
3699 case REQ_SEARCH:
3700 case REQ_SEARCH_BACK:
3701 {
3702 const char *prompt = request == REQ_SEARCH
3703 ? "/" : "?";
3704 char *search = read_prompt(prompt);
3705
3706 if (search)
3707 string_copy(opt_search, search);
3708 else
3709 request = REQ_NONE;
3710 break;
3711 }
3712 case REQ_SCREEN_RESIZE:
3713 {
3714 int height, width;
3715
3716 getmaxyx(stdscr, height, width);
3717
3718 /* Resize the status view and let the view driver take
3719 * care of resizing the displayed views. */
3720 wresize(status_win, 1, width);
3721 mvwin(status_win, height - 1, 0);
3722 wrefresh(status_win);
3723 break;
3724 }
3725 default:
3726 break;
3727 }
3728 }
3729
3730 quit(0);
3731
3732 return 0;
3733 }
Full-screen terminal Git browser.