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Make the rev graph visualization have a one rev look-ahead
[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 view->ops->read(view, NULL);
1932 end_update(view);
1933 return FALSE;
1934 }
1935
1936
1937 /*
1938 * View opening
1939 */
1940
1941 static void open_help_view(struct view *view)
1942 {
1943 char buf[BUFSIZ];
1944 int lines = ARRAY_SIZE(req_info) + 2;
1945 int i;
1946
1947 if (view->lines > 0)
1948 return;
1949
1950 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1951 if (!req_info[i].request)
1952 lines++;
1953
1954 view->line = calloc(lines, sizeof(*view->line));
1955 if (!view->line) {
1956 report("Allocation failure");
1957 return;
1958 }
1959
1960 view->ops->read(view, "Quick reference for tig keybindings:");
1961
1962 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1963 char *key;
1964
1965 if (!req_info[i].request) {
1966 view->ops->read(view, "");
1967 view->ops->read(view, req_info[i].help);
1968 continue;
1969 }
1970
1971 key = get_key(req_info[i].request);
1972 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1973 continue;
1974
1975 view->ops->read(view, buf);
1976 }
1977 }
1978
1979 enum open_flags {
1980 OPEN_DEFAULT = 0, /* Use default view switching. */
1981 OPEN_SPLIT = 1, /* Split current view. */
1982 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1983 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1984 };
1985
1986 static void
1987 open_view(struct view *prev, enum request request, enum open_flags flags)
1988 {
1989 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1990 bool split = !!(flags & OPEN_SPLIT);
1991 bool reload = !!(flags & OPEN_RELOAD);
1992 struct view *view = VIEW(request);
1993 int nviews = displayed_views();
1994 struct view *base_view = display[0];
1995
1996 if (view == prev && nviews == 1 && !reload) {
1997 report("Already in %s view", view->name);
1998 return;
1999 }
2000
2001 if (view == VIEW(REQ_VIEW_HELP)) {
2002 open_help_view(view);
2003
2004 } else if ((reload || strcmp(view->vid, view->id)) &&
2005 !begin_update(view)) {
2006 report("Failed to load %s view", view->name);
2007 return;
2008 }
2009
2010 if (split) {
2011 display[1] = view;
2012 if (!backgrounded)
2013 current_view = 1;
2014 } else {
2015 /* Maximize the current view. */
2016 memset(display, 0, sizeof(display));
2017 current_view = 0;
2018 display[current_view] = view;
2019 }
2020
2021 /* Resize the view when switching between split- and full-screen,
2022 * or when switching between two different full-screen views. */
2023 if (nviews != displayed_views() ||
2024 (nviews == 1 && base_view != display[0]))
2025 resize_display();
2026
2027 if (split && prev->lineno - prev->offset >= prev->height) {
2028 /* Take the title line into account. */
2029 int lines = prev->lineno - prev->offset - prev->height + 1;
2030
2031 /* Scroll the view that was split if the current line is
2032 * outside the new limited view. */
2033 do_scroll_view(prev, lines);
2034 }
2035
2036 if (prev && view != prev) {
2037 if (split && !backgrounded) {
2038 /* "Blur" the previous view. */
2039 update_view_title(prev);
2040 }
2041
2042 view->parent = prev;
2043 }
2044
2045 if (view->pipe && view->lines == 0) {
2046 /* Clear the old view and let the incremental updating refill
2047 * the screen. */
2048 wclear(view->win);
2049 report("");
2050 } else {
2051 redraw_view(view);
2052 report("");
2053 }
2054
2055 /* If the view is backgrounded the above calls to report()
2056 * won't redraw the view title. */
2057 if (backgrounded)
2058 update_view_title(view);
2059 }
2060
2061
2062 /*
2063 * User request switch noodle
2064 */
2065
2066 static int
2067 view_driver(struct view *view, enum request request)
2068 {
2069 int i;
2070
2071 switch (request) {
2072 case REQ_MOVE_UP:
2073 case REQ_MOVE_DOWN:
2074 case REQ_MOVE_PAGE_UP:
2075 case REQ_MOVE_PAGE_DOWN:
2076 case REQ_MOVE_FIRST_LINE:
2077 case REQ_MOVE_LAST_LINE:
2078 move_view(view, request);
2079 break;
2080
2081 case REQ_SCROLL_LINE_DOWN:
2082 case REQ_SCROLL_LINE_UP:
2083 case REQ_SCROLL_PAGE_DOWN:
2084 case REQ_SCROLL_PAGE_UP:
2085 scroll_view(view, request);
2086 break;
2087
2088 case REQ_VIEW_BLOB:
2089 if (!ref_blob[0]) {
2090 report("No file chosen, press 't' to open tree view");
2091 break;
2092 }
2093 /* Fall-through */
2094 case REQ_VIEW_MAIN:
2095 case REQ_VIEW_DIFF:
2096 case REQ_VIEW_LOG:
2097 case REQ_VIEW_TREE:
2098 case REQ_VIEW_HELP:
2099 case REQ_VIEW_PAGER:
2100 open_view(view, request, OPEN_DEFAULT);
2101 break;
2102
2103 case REQ_NEXT:
2104 case REQ_PREVIOUS:
2105 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2106
2107 if ((view == VIEW(REQ_VIEW_DIFF) &&
2108 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2109 (view == VIEW(REQ_VIEW_BLOB) &&
2110 view->parent == VIEW(REQ_VIEW_TREE))) {
2111 view = view->parent;
2112 move_view(view, request);
2113 if (view_is_displayed(view))
2114 update_view_title(view);
2115 } else {
2116 move_view(view, request);
2117 break;
2118 }
2119 /* Fall-through */
2120
2121 case REQ_ENTER:
2122 if (!view->lines) {
2123 report("Nothing to enter");
2124 break;
2125 }
2126 return view->ops->enter(view, &view->line[view->lineno]);
2127
2128 case REQ_VIEW_NEXT:
2129 {
2130 int nviews = displayed_views();
2131 int next_view = (current_view + 1) % nviews;
2132
2133 if (next_view == current_view) {
2134 report("Only one view is displayed");
2135 break;
2136 }
2137
2138 current_view = next_view;
2139 /* Blur out the title of the previous view. */
2140 update_view_title(view);
2141 report("");
2142 break;
2143 }
2144 case REQ_TOGGLE_LINENO:
2145 opt_line_number = !opt_line_number;
2146 redraw_display();
2147 break;
2148
2149 case REQ_TOGGLE_REV_GRAPH:
2150 opt_rev_graph = !opt_rev_graph;
2151 redraw_display();
2152 break;
2153
2154 case REQ_PROMPT:
2155 /* Always reload^Wrerun commands from the prompt. */
2156 open_view(view, opt_request, OPEN_RELOAD);
2157 break;
2158
2159 case REQ_SEARCH:
2160 case REQ_SEARCH_BACK:
2161 search_view(view, request);
2162 break;
2163
2164 case REQ_FIND_NEXT:
2165 case REQ_FIND_PREV:
2166 find_next(view, request);
2167 break;
2168
2169 case REQ_STOP_LOADING:
2170 for (i = 0; i < ARRAY_SIZE(views); i++) {
2171 view = &views[i];
2172 if (view->pipe)
2173 report("Stopped loading the %s view", view->name),
2174 end_update(view);
2175 }
2176 break;
2177
2178 case REQ_SHOW_VERSION:
2179 report("%s (built %s)", VERSION, __DATE__);
2180 return TRUE;
2181
2182 case REQ_SCREEN_RESIZE:
2183 resize_display();
2184 /* Fall-through */
2185 case REQ_SCREEN_REDRAW:
2186 redraw_display();
2187 break;
2188
2189 case REQ_NONE:
2190 doupdate();
2191 return TRUE;
2192
2193 case REQ_VIEW_CLOSE:
2194 /* XXX: Mark closed views by letting view->parent point to the
2195 * view itself. Parents to closed view should never be
2196 * followed. */
2197 if (view->parent &&
2198 view->parent->parent != view->parent) {
2199 memset(display, 0, sizeof(display));
2200 current_view = 0;
2201 display[current_view] = view->parent;
2202 view->parent = view;
2203 resize_display();
2204 redraw_display();
2205 break;
2206 }
2207 /* Fall-through */
2208 case REQ_QUIT:
2209 return FALSE;
2210
2211 default:
2212 /* An unknown key will show most commonly used commands. */
2213 report("Unknown key, press 'h' for help");
2214 return TRUE;
2215 }
2216
2217 return TRUE;
2218 }
2219
2220
2221 /*
2222 * Pager backend
2223 */
2224
2225 static bool
2226 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2227 {
2228 char *text = line->data;
2229 enum line_type type = line->type;
2230 int textlen = strlen(text);
2231 int attr;
2232
2233 wmove(view->win, lineno, 0);
2234
2235 if (selected) {
2236 type = LINE_CURSOR;
2237 wchgat(view->win, -1, 0, type, NULL);
2238 }
2239
2240 attr = get_line_attr(type);
2241 wattrset(view->win, attr);
2242
2243 if (opt_line_number || opt_tab_size < TABSIZE) {
2244 static char spaces[] = " ";
2245 int col_offset = 0, col = 0;
2246
2247 if (opt_line_number) {
2248 unsigned long real_lineno = view->offset + lineno + 1;
2249
2250 if (real_lineno == 1 ||
2251 (real_lineno % opt_num_interval) == 0) {
2252 wprintw(view->win, "%.*d", view->digits, real_lineno);
2253
2254 } else {
2255 waddnstr(view->win, spaces,
2256 MIN(view->digits, STRING_SIZE(spaces)));
2257 }
2258 waddstr(view->win, ": ");
2259 col_offset = view->digits + 2;
2260 }
2261
2262 while (text && col_offset + col < view->width) {
2263 int cols_max = view->width - col_offset - col;
2264 char *pos = text;
2265 int cols;
2266
2267 if (*text == '\t') {
2268 text++;
2269 assert(sizeof(spaces) > TABSIZE);
2270 pos = spaces;
2271 cols = opt_tab_size - (col % opt_tab_size);
2272
2273 } else {
2274 text = strchr(text, '\t');
2275 cols = line ? text - pos : strlen(pos);
2276 }
2277
2278 waddnstr(view->win, pos, MIN(cols, cols_max));
2279 col += cols;
2280 }
2281
2282 } else {
2283 int col = 0, pos = 0;
2284
2285 for (; pos < textlen && col < view->width; pos++, col++)
2286 if (text[pos] == '\t')
2287 col += TABSIZE - (col % TABSIZE) - 1;
2288
2289 waddnstr(view->win, text, pos);
2290 }
2291
2292 return TRUE;
2293 }
2294
2295 static bool
2296 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2297 {
2298 char refbuf[SIZEOF_STR];
2299 char *ref = NULL;
2300 FILE *pipe;
2301
2302 if (!string_format(refbuf, "git describe %s", commit_id))
2303 return TRUE;
2304
2305 pipe = popen(refbuf, "r");
2306 if (!pipe)
2307 return TRUE;
2308
2309 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2310 ref = chomp_string(ref);
2311 pclose(pipe);
2312
2313 if (!ref || !*ref)
2314 return TRUE;
2315
2316 /* This is the only fatal call, since it can "corrupt" the buffer. */
2317 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2318 return FALSE;
2319
2320 return TRUE;
2321 }
2322
2323 static void
2324 add_pager_refs(struct view *view, struct line *line)
2325 {
2326 char buf[SIZEOF_STR];
2327 char *commit_id = line->data + STRING_SIZE("commit ");
2328 struct ref **refs;
2329 size_t bufpos = 0, refpos = 0;
2330 const char *sep = "Refs: ";
2331 bool is_tag = FALSE;
2332
2333 assert(line->type == LINE_COMMIT);
2334
2335 refs = get_refs(commit_id);
2336 if (!refs) {
2337 if (view == VIEW(REQ_VIEW_DIFF))
2338 goto try_add_describe_ref;
2339 return;
2340 }
2341
2342 do {
2343 struct ref *ref = refs[refpos];
2344 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2345
2346 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2347 return;
2348 sep = ", ";
2349 if (ref->tag)
2350 is_tag = TRUE;
2351 } while (refs[refpos++]->next);
2352
2353 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2354 try_add_describe_ref:
2355 /* Add <tag>-g<commit_id> "fake" reference. */
2356 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2357 return;
2358 }
2359
2360 if (bufpos == 0)
2361 return;
2362
2363 if (!realloc_lines(view, view->line_size + 1))
2364 return;
2365
2366 line = &view->line[view->lines];
2367 line->data = strdup(buf);
2368 if (!line->data)
2369 return;
2370
2371 line->type = LINE_PP_REFS;
2372 view->lines++;
2373 }
2374
2375 static bool
2376 pager_read(struct view *view, char *data)
2377 {
2378 struct line *line = &view->line[view->lines];
2379
2380 if (!data)
2381 return TRUE;
2382
2383 line->data = strdup(data);
2384 if (!line->data)
2385 return FALSE;
2386
2387 line->type = get_line_type(line->data);
2388 view->lines++;
2389
2390 if (line->type == LINE_COMMIT &&
2391 (view == VIEW(REQ_VIEW_DIFF) ||
2392 view == VIEW(REQ_VIEW_LOG)))
2393 add_pager_refs(view, line);
2394
2395 return TRUE;
2396 }
2397
2398 static bool
2399 pager_enter(struct view *view, struct line *line)
2400 {
2401 int split = 0;
2402
2403 if (line->type == LINE_COMMIT &&
2404 (view == VIEW(REQ_VIEW_LOG) ||
2405 view == VIEW(REQ_VIEW_PAGER))) {
2406 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2407 split = 1;
2408 }
2409
2410 /* Always scroll the view even if it was split. That way
2411 * you can use Enter to scroll through the log view and
2412 * split open each commit diff. */
2413 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2414
2415 /* FIXME: A minor workaround. Scrolling the view will call report("")
2416 * but if we are scrolling a non-current view this won't properly
2417 * update the view title. */
2418 if (split)
2419 update_view_title(view);
2420
2421 return TRUE;
2422 }
2423
2424 static bool
2425 pager_grep(struct view *view, struct line *line)
2426 {
2427 regmatch_t pmatch;
2428 char *text = line->data;
2429
2430 if (!*text)
2431 return FALSE;
2432
2433 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2434 return FALSE;
2435
2436 return TRUE;
2437 }
2438
2439 static void
2440 pager_select(struct view *view, struct line *line)
2441 {
2442 if (line->type == LINE_COMMIT) {
2443 char *text = line->data;
2444
2445 string_copy(view->ref, text + STRING_SIZE("commit "));
2446 string_copy(ref_commit, view->ref);
2447 }
2448 }
2449
2450 static struct view_ops pager_ops = {
2451 "line",
2452 pager_draw,
2453 pager_read,
2454 pager_enter,
2455 pager_grep,
2456 pager_select,
2457 };
2458
2459
2460 /*
2461 * Tree backend
2462 */
2463
2464 /* Parse output from git-ls-tree(1):
2465 *
2466 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2467 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2468 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2469 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2470 */
2471
2472 #define SIZEOF_TREE_ATTR \
2473 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2474
2475 #define TREE_UP_FORMAT "040000 tree %s\t.."
2476
2477 static int
2478 tree_compare_entry(enum line_type type1, char *name1,
2479 enum line_type type2, char *name2)
2480 {
2481 if (type1 != type2) {
2482 if (type1 == LINE_TREE_DIR)
2483 return -1;
2484 return 1;
2485 }
2486
2487 return strcmp(name1, name2);
2488 }
2489
2490 static bool
2491 tree_read(struct view *view, char *text)
2492 {
2493 size_t textlen = text ? strlen(text) : 0;
2494 char buf[SIZEOF_STR];
2495 unsigned long pos;
2496 enum line_type type;
2497 bool first_read = view->lines == 0;
2498
2499 if (textlen <= SIZEOF_TREE_ATTR)
2500 return FALSE;
2501
2502 type = text[STRING_SIZE("100644 ")] == 't'
2503 ? LINE_TREE_DIR : LINE_TREE_FILE;
2504
2505 if (first_read) {
2506 /* Add path info line */
2507 if (string_format(buf, "Directory path /%s", opt_path) &&
2508 realloc_lines(view, view->line_size + 1) &&
2509 pager_read(view, buf))
2510 view->line[view->lines - 1].type = LINE_DEFAULT;
2511 else
2512 return FALSE;
2513
2514 /* Insert "link" to parent directory. */
2515 if (*opt_path &&
2516 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2517 realloc_lines(view, view->line_size + 1) &&
2518 pager_read(view, buf))
2519 view->line[view->lines - 1].type = LINE_TREE_DIR;
2520 else if (*opt_path)
2521 return FALSE;
2522 }
2523
2524 /* Strip the path part ... */
2525 if (*opt_path) {
2526 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2527 size_t striplen = strlen(opt_path);
2528 char *path = text + SIZEOF_TREE_ATTR;
2529
2530 if (pathlen > striplen)
2531 memmove(path, path + striplen,
2532 pathlen - striplen + 1);
2533 }
2534
2535 /* Skip "Directory ..." and ".." line. */
2536 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2537 struct line *line = &view->line[pos];
2538 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2539 char *path2 = text + SIZEOF_TREE_ATTR;
2540 int cmp = tree_compare_entry(line->type, path1, type, path2);
2541
2542 if (cmp <= 0)
2543 continue;
2544
2545 text = strdup(text);
2546 if (!text)
2547 return FALSE;
2548
2549 if (view->lines > pos)
2550 memmove(&view->line[pos + 1], &view->line[pos],
2551 (view->lines - pos) * sizeof(*line));
2552
2553 line = &view->line[pos];
2554 line->data = text;
2555 line->type = type;
2556 view->lines++;
2557 return TRUE;
2558 }
2559
2560 if (!pager_read(view, text))
2561 return FALSE;
2562
2563 /* Move the current line to the first tree entry. */
2564 if (first_read)
2565 view->lineno++;
2566
2567 view->line[view->lines - 1].type = type;
2568 return TRUE;
2569 }
2570
2571 static bool
2572 tree_enter(struct view *view, struct line *line)
2573 {
2574 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2575 enum request request;
2576
2577 switch (line->type) {
2578 case LINE_TREE_DIR:
2579 /* Depending on whether it is a subdir or parent (updir?) link
2580 * mangle the path buffer. */
2581 if (line == &view->line[1] && *opt_path) {
2582 size_t path_len = strlen(opt_path);
2583 char *dirsep = opt_path + path_len - 1;
2584
2585 while (dirsep > opt_path && dirsep[-1] != '/')
2586 dirsep--;
2587
2588 dirsep[0] = 0;
2589
2590 } else {
2591 size_t pathlen = strlen(opt_path);
2592 size_t origlen = pathlen;
2593 char *data = line->data;
2594 char *basename = data + SIZEOF_TREE_ATTR;
2595
2596 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2597 opt_path[origlen] = 0;
2598 return TRUE;
2599 }
2600 }
2601
2602 /* Trees and subtrees share the same ID, so they are not not
2603 * unique like blobs. */
2604 flags |= OPEN_RELOAD;
2605 request = REQ_VIEW_TREE;
2606 break;
2607
2608 case LINE_TREE_FILE:
2609 request = REQ_VIEW_BLOB;
2610 break;
2611
2612 default:
2613 return TRUE;
2614 }
2615
2616 open_view(view, request, flags);
2617
2618 return TRUE;
2619 }
2620
2621 static void
2622 tree_select(struct view *view, struct line *line)
2623 {
2624 char *text = line->data;
2625
2626 text += STRING_SIZE("100644 blob ");
2627
2628 if (line->type == LINE_TREE_FILE) {
2629 string_ncopy(ref_blob, text, 40);
2630 /* Also update the blob view's ref, since all there must always
2631 * be in sync. */
2632 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2633
2634 } else if (line->type != LINE_TREE_DIR) {
2635 return;
2636 }
2637
2638 string_ncopy(view->ref, text, 40);
2639 }
2640
2641 static struct view_ops tree_ops = {
2642 "file",
2643 pager_draw,
2644 tree_read,
2645 tree_enter,
2646 pager_grep,
2647 tree_select,
2648 };
2649
2650 static bool
2651 blob_read(struct view *view, char *line)
2652 {
2653 bool state = pager_read(view, line);
2654
2655 if (state == TRUE)
2656 view->line[view->lines - 1].type = LINE_DEFAULT;
2657
2658 return state;
2659 }
2660
2661 static struct view_ops blob_ops = {
2662 "line",
2663 pager_draw,
2664 blob_read,
2665 pager_enter,
2666 pager_grep,
2667 pager_select,
2668 };
2669
2670
2671 /*
2672 * Revision graph
2673 */
2674
2675 struct commit {
2676 char id[SIZEOF_REV]; /* SHA1 ID. */
2677 char title[75]; /* First line of the commit message. */
2678 char author[75]; /* Author of the commit. */
2679 struct tm time; /* Date from the author ident. */
2680 struct ref **refs; /* Repository references. */
2681 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2682 size_t graph_size; /* The width of the graph array. */
2683 };
2684
2685 /* Size of rev graph with no "padding" columns */
2686 #define SIZEOF_REVITEMS (SIZEOF_REVGRAPH - (SIZEOF_REVGRAPH / 2))
2687
2688 struct rev_graph {
2689 struct rev_graph *prev, *next, *parents;
2690 char rev[SIZEOF_REVITEMS][SIZEOF_REV];
2691 size_t size;
2692 struct commit *commit;
2693 size_t pos;
2694 };
2695
2696 /* Parents of the commit being visualized. */
2697 static struct rev_graph graph_parents[4];
2698
2699 /* The current stack of revisions on the graph. */
2700 static struct rev_graph graph_stacks[4] = {
2701 { &graph_stacks[3], &graph_stacks[1], &graph_parents[0] },
2702 { &graph_stacks[0], &graph_stacks[2], &graph_parents[1] },
2703 { &graph_stacks[1], &graph_stacks[3], &graph_parents[2] },
2704 { &graph_stacks[2], &graph_stacks[0], &graph_parents[3] },
2705 };
2706
2707 static inline bool
2708 graph_parent_is_merge(struct rev_graph *graph)
2709 {
2710 return graph->parents->size > 1;
2711 }
2712
2713 static inline void
2714 append_to_rev_graph(struct rev_graph *graph, chtype symbol)
2715 {
2716 struct commit *commit = graph->commit;
2717
2718 if (commit->graph_size < ARRAY_SIZE(commit->graph) - 1)
2719 commit->graph[commit->graph_size++] = symbol;
2720 }
2721
2722 static void
2723 done_rev_graph(struct rev_graph *graph)
2724 {
2725 if (graph_parent_is_merge(graph) &&
2726 graph->pos < graph->size - 1 &&
2727 graph->next->size == graph->size + graph->parents->size - 1) {
2728 size_t i = graph->pos + graph->parents->size - 1;
2729
2730 graph->commit->graph_size = i * 2;
2731 while (i < graph->next->size - 1) {
2732 append_to_rev_graph(graph, ' ');
2733 append_to_rev_graph(graph, '\\');
2734 i++;
2735 }
2736 }
2737
2738 graph->size = graph->pos = 0;
2739 graph->commit = NULL;
2740 memset(graph->parents, 0, sizeof(*graph->parents));
2741 }
2742
2743 static void
2744 push_rev_graph(struct rev_graph *graph, char *parent)
2745 {
2746 /* Combine duplicate parents lines. */
2747 if (graph->size > 0 &&
2748 !strncmp(graph->rev[graph->size - 1], parent, SIZEOF_REV))
2749 return;
2750
2751 if (graph->size < SIZEOF_REVITEMS) {
2752 string_ncopy(graph->rev[graph->size++], parent, SIZEOF_REV);
2753 }
2754 }
2755
2756 static chtype
2757 get_rev_graph_symbol(struct rev_graph *graph)
2758 {
2759 chtype symbol;
2760
2761 if (graph->parents->size == 0)
2762 symbol = REVGRAPH_INIT;
2763 else if (graph_parent_is_merge(graph))
2764 symbol = REVGRAPH_MERGE;
2765 else if (graph->pos >= graph->size)
2766 symbol = REVGRAPH_BRANCH;
2767 else
2768 symbol = REVGRAPH_COMMIT;
2769
2770 return symbol;
2771 }
2772
2773 static void
2774 draw_rev_graph(struct rev_graph *graph)
2775 {
2776 struct rev_filler {
2777 chtype separator, line;
2778 };
2779 enum { DEFAULT, RSHARP, RDIAG, LDIAG };
2780 static struct rev_filler fillers[] = {
2781 { ' ', REVGRAPH_LINE },
2782 { '`', '.' },
2783 { '\'', ' ' },
2784 { '/', ' ' },
2785 };
2786 chtype symbol = get_rev_graph_symbol(graph);
2787 struct rev_filler *filler;
2788 size_t i;
2789
2790 filler = &fillers[DEFAULT];
2791
2792 for (i = 0; i < graph->pos; i++) {
2793 append_to_rev_graph(graph, filler->line);
2794 if (graph_parent_is_merge(graph->prev) &&
2795 graph->prev->pos == i)
2796 filler = &fillers[RSHARP];
2797
2798 append_to_rev_graph(graph, filler->separator);
2799 }
2800
2801 /* Place the symbol for this revision. */
2802 append_to_rev_graph(graph, symbol);
2803
2804 if (graph->prev->size > graph->size)
2805 filler = &fillers[RDIAG];
2806 else
2807 filler = &fillers[DEFAULT];
2808
2809 i++;
2810
2811 for (; i < graph->size; i++) {
2812 append_to_rev_graph(graph, filler->separator);
2813 append_to_rev_graph(graph, filler->line);
2814 if (graph_parent_is_merge(graph->prev) &&
2815 i < graph->prev->pos + graph->parents->size)
2816 filler = &fillers[RSHARP];
2817 if (graph->prev->size > graph->size)
2818 filler = &fillers[LDIAG];
2819 }
2820
2821 if (graph->prev->size > graph->size) {
2822 append_to_rev_graph(graph, filler->separator);
2823 if (filler->line != ' ')
2824 append_to_rev_graph(graph, filler->line);
2825 }
2826 }
2827
2828 /* Prepare the next rev graph */
2829 static void
2830 prepare_rev_graph(struct rev_graph *graph)
2831 {
2832 size_t i;
2833
2834 /* First, traverse all lines of revisions up to the active one. */
2835 for (graph->pos = 0; graph->pos < graph->size; graph->pos++) {
2836 if (!strcmp(graph->rev[graph->pos], graph->commit->id))
2837 break;
2838
2839 push_rev_graph(graph->next, graph->rev[graph->pos]);
2840 }
2841
2842 /* Interleave the new revision parent(s). */
2843 for (i = 0; i < graph->parents->size; i++)
2844 push_rev_graph(graph->next, graph->parents->rev[i]);
2845
2846 /* Lastly, put any remaining revisions. */
2847 for (i = graph->pos + 1; i < graph->size; i++)
2848 push_rev_graph(graph->next, graph->rev[i]);
2849 }
2850
2851 static void
2852 update_rev_graph(struct rev_graph *graph)
2853 {
2854 /* If this is the finalizing update ... */
2855 if (graph->commit)
2856 prepare_rev_graph(graph);
2857
2858 /* Graph visualization needs a one rev look-ahead,
2859 * so the first update doesn't visualize anything. */
2860 if (!graph->prev->commit)
2861 return;
2862
2863 draw_rev_graph(graph->prev);
2864 done_rev_graph(graph->prev->prev);
2865 }
2866
2867
2868 /*
2869 * Main view backend
2870 */
2871
2872 static bool
2873 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2874 {
2875 char buf[DATE_COLS + 1];
2876 struct commit *commit = line->data;
2877 enum line_type type;
2878 int col = 0;
2879 size_t timelen;
2880 size_t authorlen;
2881 int trimmed = 1;
2882
2883 if (!*commit->author)
2884 return FALSE;
2885
2886 wmove(view->win, lineno, col);
2887
2888 if (selected) {
2889 type = LINE_CURSOR;
2890 wattrset(view->win, get_line_attr(type));
2891 wchgat(view->win, -1, 0, type, NULL);
2892
2893 } else {
2894 type = LINE_MAIN_COMMIT;
2895 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2896 }
2897
2898 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2899 waddnstr(view->win, buf, timelen);
2900 waddstr(view->win, " ");
2901
2902 col += DATE_COLS;
2903 wmove(view->win, lineno, col);
2904 if (type != LINE_CURSOR)
2905 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2906
2907 if (opt_utf8) {
2908 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2909 } else {
2910 authorlen = strlen(commit->author);
2911 if (authorlen > AUTHOR_COLS - 2) {
2912 authorlen = AUTHOR_COLS - 2;
2913 trimmed = 1;
2914 }
2915 }
2916
2917 if (trimmed) {
2918 waddnstr(view->win, commit->author, authorlen);
2919 if (type != LINE_CURSOR)
2920 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2921 waddch(view->win, '~');
2922 } else {
2923 waddstr(view->win, commit->author);
2924 }
2925
2926 col += AUTHOR_COLS;
2927 if (type != LINE_CURSOR)
2928 wattrset(view->win, A_NORMAL);
2929
2930 if (opt_rev_graph && commit->graph_size) {
2931 size_t i;
2932
2933 wmove(view->win, lineno, col);
2934 /* Using waddch() instead of waddnstr() ensures that
2935 * they'll be rendered correctly for the cursor line. */
2936 for (i = 0; i < commit->graph_size; i++)
2937 waddch(view->win, commit->graph[i]);
2938
2939 waddch(view->win, ' ');
2940 col += commit->graph_size + 1;
2941 }
2942
2943 wmove(view->win, lineno, col);
2944
2945 if (commit->refs) {
2946 size_t i = 0;
2947
2948 do {
2949 if (type == LINE_CURSOR)
2950 ;
2951 else if (commit->refs[i]->tag)
2952 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2953 else
2954 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2955 waddstr(view->win, "[");
2956 waddstr(view->win, commit->refs[i]->name);
2957 waddstr(view->win, "]");
2958 if (type != LINE_CURSOR)
2959 wattrset(view->win, A_NORMAL);
2960 waddstr(view->win, " ");
2961 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2962 } while (commit->refs[i++]->next);
2963 }
2964
2965 if (type != LINE_CURSOR)
2966 wattrset(view->win, get_line_attr(type));
2967
2968 {
2969 int titlelen = strlen(commit->title);
2970
2971 if (col + titlelen > view->width)
2972 titlelen = view->width - col;
2973
2974 waddnstr(view->win, commit->title, titlelen);
2975 }
2976
2977 return TRUE;
2978 }
2979
2980 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2981 static bool
2982 main_read(struct view *view, char *line)
2983 {
2984 static struct rev_graph *graph = graph_stacks;
2985 enum line_type type;
2986 struct commit *commit = view->lines
2987 ? view->line[view->lines - 1].data : NULL;
2988
2989 if (!line) {
2990 update_rev_graph(graph);
2991 return TRUE;
2992 }
2993
2994 type = get_line_type(line);
2995
2996 switch (type) {
2997 case LINE_COMMIT:
2998 commit = calloc(1, sizeof(struct commit));
2999 if (!commit)
3000 return FALSE;
3001
3002 line += STRING_SIZE("commit ");
3003
3004 view->line[view->lines++].data = commit;
3005 string_copy(commit->id, line);
3006 commit->refs = get_refs(commit->id);
3007 graph->commit = commit;
3008 break;
3009
3010 case LINE_PARENT:
3011 if (commit) {
3012 line += STRING_SIZE("parent ");
3013 push_rev_graph(graph->parents, line);
3014 }
3015 break;
3016
3017 case LINE_AUTHOR:
3018 {
3019 char *ident = line + STRING_SIZE("author ");
3020 char *end = strchr(ident, '<');
3021
3022 if (!commit)
3023 break;
3024
3025 update_rev_graph(graph);
3026 graph = graph->next;
3027
3028 if (end) {
3029 char *email = end + 1;
3030
3031 for (; end > ident && isspace(end[-1]); end--) ;
3032
3033 if (end == ident && *email) {
3034 ident = email;
3035 end = strchr(ident, '>');
3036 for (; end > ident && isspace(end[-1]); end--) ;
3037 }
3038 *end = 0;
3039 }
3040
3041 /* End is NULL or ident meaning there's no author. */
3042 if (end <= ident)
3043 ident = "Unknown";
3044
3045 string_copy(commit->author, ident);
3046
3047 /* Parse epoch and timezone */
3048 if (end) {
3049 char *secs = strchr(end + 1, '>');
3050 char *zone;
3051 time_t time;
3052
3053 if (!secs || secs[1] != ' ')
3054 break;
3055
3056 secs += 2;
3057 time = (time_t) atol(secs);
3058 zone = strchr(secs, ' ');
3059 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
3060 long tz;
3061
3062 zone++;
3063 tz = ('0' - zone[1]) * 60 * 60 * 10;
3064 tz += ('0' - zone[2]) * 60 * 60;
3065 tz += ('0' - zone[3]) * 60;
3066 tz += ('0' - zone[4]) * 60;
3067
3068 if (zone[0] == '-')
3069 tz = -tz;
3070
3071 time -= tz;
3072 }
3073 gmtime_r(&time, &commit->time);
3074 }
3075 break;
3076 }
3077 default:
3078 if (!commit)
3079 break;
3080
3081 /* Fill in the commit title if it has not already been set. */
3082 if (commit->title[0])
3083 break;
3084
3085 /* Require titles to start with a non-space character at the
3086 * offset used by git log. */
3087 /* FIXME: More gracefull handling of titles; append "..." to
3088 * shortened titles, etc. */
3089 if (strncmp(line, " ", 4) ||
3090 isspace(line[4]))
3091 break;
3092
3093 string_copy(commit->title, line + 4);
3094 }
3095
3096 return TRUE;
3097 }
3098
3099 static bool
3100 main_enter(struct view *view, struct line *line)
3101 {
3102 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
3103
3104 open_view(view, REQ_VIEW_DIFF, flags);
3105 return TRUE;
3106 }
3107
3108 static bool
3109 main_grep(struct view *view, struct line *line)
3110 {
3111 struct commit *commit = line->data;
3112 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
3113 char buf[DATE_COLS + 1];
3114 regmatch_t pmatch;
3115
3116 for (state = S_TITLE; state < S_END; state++) {
3117 char *text;
3118
3119 switch (state) {
3120 case S_TITLE: text = commit->title; break;
3121 case S_AUTHOR: text = commit->author; break;
3122 case S_DATE:
3123 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
3124 continue;
3125 text = buf;
3126 break;
3127
3128 default:
3129 return FALSE;
3130 }
3131
3132 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
3133 return TRUE;
3134 }
3135
3136 return FALSE;
3137 }
3138
3139 static void
3140 main_select(struct view *view, struct line *line)
3141 {
3142 struct commit *commit = line->data;
3143
3144 string_copy(view->ref, commit->id);
3145 string_copy(ref_commit, view->ref);
3146 }
3147
3148 static struct view_ops main_ops = {
3149 "commit",
3150 main_draw,
3151 main_read,
3152 main_enter,
3153 main_grep,
3154 main_select,
3155 };
3156
3157
3158 /*
3159 * Unicode / UTF-8 handling
3160 *
3161 * NOTE: Much of the following code for dealing with unicode is derived from
3162 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
3163 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
3164 */
3165
3166 /* I've (over)annotated a lot of code snippets because I am not entirely
3167 * confident that the approach taken by this small UTF-8 interface is correct.
3168 * --jonas */
3169
3170 static inline int
3171 unicode_width(unsigned long c)
3172 {
3173 if (c >= 0x1100 &&
3174 (c <= 0x115f /* Hangul Jamo */
3175 || c == 0x2329
3176 || c == 0x232a
3177 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
3178 /* CJK ... Yi */
3179 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
3180 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
3181 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
3182 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
3183 || (c >= 0xffe0 && c <= 0xffe6)
3184 || (c >= 0x20000 && c <= 0x2fffd)
3185 || (c >= 0x30000 && c <= 0x3fffd)))
3186 return 2;
3187
3188 return 1;
3189 }
3190
3191 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
3192 * Illegal bytes are set one. */
3193 static const unsigned char utf8_bytes[256] = {
3194 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,
3195 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,
3196 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,
3197 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,
3198 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,
3199 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,
3200 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,
3201 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,
3202 };
3203
3204 /* Decode UTF-8 multi-byte representation into a unicode character. */
3205 static inline unsigned long
3206 utf8_to_unicode(const char *string, size_t length)
3207 {
3208 unsigned long unicode;
3209
3210 switch (length) {
3211 case 1:
3212 unicode = string[0];
3213 break;
3214 case 2:
3215 unicode = (string[0] & 0x1f) << 6;
3216 unicode += (string[1] & 0x3f);
3217 break;
3218 case 3:
3219 unicode = (string[0] & 0x0f) << 12;
3220 unicode += ((string[1] & 0x3f) << 6);
3221 unicode += (string[2] & 0x3f);
3222 break;
3223 case 4:
3224 unicode = (string[0] & 0x0f) << 18;
3225 unicode += ((string[1] & 0x3f) << 12);
3226 unicode += ((string[2] & 0x3f) << 6);
3227 unicode += (string[3] & 0x3f);
3228 break;
3229 case 5:
3230 unicode = (string[0] & 0x0f) << 24;
3231 unicode += ((string[1] & 0x3f) << 18);
3232 unicode += ((string[2] & 0x3f) << 12);
3233 unicode += ((string[3] & 0x3f) << 6);
3234 unicode += (string[4] & 0x3f);
3235 break;
3236 case 6:
3237 unicode = (string[0] & 0x01) << 30;
3238 unicode += ((string[1] & 0x3f) << 24);
3239 unicode += ((string[2] & 0x3f) << 18);
3240 unicode += ((string[3] & 0x3f) << 12);
3241 unicode += ((string[4] & 0x3f) << 6);
3242 unicode += (string[5] & 0x3f);
3243 break;
3244 default:
3245 die("Invalid unicode length");
3246 }
3247
3248 /* Invalid characters could return the special 0xfffd value but NUL
3249 * should be just as good. */
3250 return unicode > 0xffff ? 0 : unicode;
3251 }
3252
3253 /* Calculates how much of string can be shown within the given maximum width
3254 * and sets trimmed parameter to non-zero value if all of string could not be
3255 * shown.
3256 *
3257 * Additionally, adds to coloffset how many many columns to move to align with
3258 * the expected position. Takes into account how multi-byte and double-width
3259 * characters will effect the cursor position.
3260 *
3261 * Returns the number of bytes to output from string to satisfy max_width. */
3262 static size_t
3263 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3264 {
3265 const char *start = string;
3266 const char *end = strchr(string, '\0');
3267 size_t mbwidth = 0;
3268 size_t width = 0;
3269
3270 *trimmed = 0;
3271
3272 while (string < end) {
3273 int c = *(unsigned char *) string;
3274 unsigned char bytes = utf8_bytes[c];
3275 size_t ucwidth;
3276 unsigned long unicode;
3277
3278 if (string + bytes > end)
3279 break;
3280
3281 /* Change representation to figure out whether
3282 * it is a single- or double-width character. */
3283
3284 unicode = utf8_to_unicode(string, bytes);
3285 /* FIXME: Graceful handling of invalid unicode character. */
3286 if (!unicode)
3287 break;
3288
3289 ucwidth = unicode_width(unicode);
3290 width += ucwidth;
3291 if (width > max_width) {
3292 *trimmed = 1;
3293 break;
3294 }
3295
3296 /* The column offset collects the differences between the
3297 * number of bytes encoding a character and the number of
3298 * columns will be used for rendering said character.
3299 *
3300 * So if some character A is encoded in 2 bytes, but will be
3301 * represented on the screen using only 1 byte this will and up
3302 * adding 1 to the multi-byte column offset.
3303 *
3304 * Assumes that no double-width character can be encoding in
3305 * less than two bytes. */
3306 if (bytes > ucwidth)
3307 mbwidth += bytes - ucwidth;
3308
3309 string += bytes;
3310 }
3311
3312 *coloffset += mbwidth;
3313
3314 return string - start;
3315 }
3316
3317
3318 /*
3319 * Status management
3320 */
3321
3322 /* Whether or not the curses interface has been initialized. */
3323 static bool cursed = FALSE;
3324
3325 /* The status window is used for polling keystrokes. */
3326 static WINDOW *status_win;
3327
3328 /* Update status and title window. */
3329 static void
3330 report(const char *msg, ...)
3331 {
3332 static bool empty = TRUE;
3333 struct view *view = display[current_view];
3334
3335 if (!empty || *msg) {
3336 va_list args;
3337
3338 va_start(args, msg);
3339
3340 werase(status_win);
3341 wmove(status_win, 0, 0);
3342 if (*msg) {
3343 vwprintw(status_win, msg, args);
3344 empty = FALSE;
3345 } else {
3346 empty = TRUE;
3347 }
3348 wrefresh(status_win);
3349
3350 va_end(args);
3351 }
3352
3353 update_view_title(view);
3354 update_display_cursor();
3355 }
3356
3357 /* Controls when nodelay should be in effect when polling user input. */
3358 static void
3359 set_nonblocking_input(bool loading)
3360 {
3361 static unsigned int loading_views;
3362
3363 if ((loading == FALSE && loading_views-- == 1) ||
3364 (loading == TRUE && loading_views++ == 0))
3365 nodelay(status_win, loading);
3366 }
3367
3368 static void
3369 init_display(void)
3370 {
3371 int x, y;
3372
3373 /* Initialize the curses library */
3374 if (isatty(STDIN_FILENO)) {
3375 cursed = !!initscr();
3376 } else {
3377 /* Leave stdin and stdout alone when acting as a pager. */
3378 FILE *io = fopen("/dev/tty", "r+");
3379
3380 if (!io)
3381 die("Failed to open /dev/tty");
3382 cursed = !!newterm(NULL, io, io);
3383 }
3384
3385 if (!cursed)
3386 die("Failed to initialize curses");
3387
3388 nonl(); /* Tell curses not to do NL->CR/NL on output */
3389 cbreak(); /* Take input chars one at a time, no wait for \n */
3390 noecho(); /* Don't echo input */
3391 leaveok(stdscr, TRUE);
3392
3393 if (has_colors())
3394 init_colors();
3395
3396 getmaxyx(stdscr, y, x);
3397 status_win = newwin(1, 0, y - 1, 0);
3398 if (!status_win)
3399 die("Failed to create status window");
3400
3401 /* Enable keyboard mapping */
3402 keypad(status_win, TRUE);
3403 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3404 }
3405
3406 static char *
3407 read_prompt(const char *prompt)
3408 {
3409 enum { READING, STOP, CANCEL } status = READING;
3410 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3411 int pos = 0;
3412
3413 while (status == READING) {
3414 struct view *view;
3415 int i, key;
3416
3417 foreach_view (view, i)
3418 update_view(view);
3419
3420 report("%s%.*s", prompt, pos, buf);
3421 /* Refresh, accept single keystroke of input */
3422 key = wgetch(status_win);
3423 switch (key) {
3424 case KEY_RETURN:
3425 case KEY_ENTER:
3426 case '\n':
3427 status = pos ? STOP : CANCEL;
3428 break;
3429
3430 case KEY_BACKSPACE:
3431 if (pos > 0)
3432 pos--;
3433 else
3434 status = CANCEL;
3435 break;
3436
3437 case KEY_ESC:
3438 status = CANCEL;
3439 break;
3440
3441 case ERR:
3442 break;
3443
3444 default:
3445 if (pos >= sizeof(buf)) {
3446 report("Input string too long");
3447 return NULL;
3448 }
3449
3450 if (isprint(key))
3451 buf[pos++] = (char) key;
3452 }
3453 }
3454
3455 if (status == CANCEL) {
3456 /* Clear the status window */
3457 report("");
3458 return NULL;
3459 }
3460
3461 buf[pos++] = 0;
3462
3463 return buf;
3464 }
3465
3466 /*
3467 * Repository references
3468 */
3469
3470 static struct ref *refs;
3471 static size_t refs_size;
3472
3473 /* Id <-> ref store */
3474 static struct ref ***id_refs;
3475 static size_t id_refs_size;
3476
3477 static struct ref **
3478 get_refs(char *id)
3479 {
3480 struct ref ***tmp_id_refs;
3481 struct ref **ref_list = NULL;
3482 size_t ref_list_size = 0;
3483 size_t i;
3484
3485 for (i = 0; i < id_refs_size; i++)
3486 if (!strcmp(id, id_refs[i][0]->id))
3487 return id_refs[i];
3488
3489 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3490 if (!tmp_id_refs)
3491 return NULL;
3492
3493 id_refs = tmp_id_refs;
3494
3495 for (i = 0; i < refs_size; i++) {
3496 struct ref **tmp;
3497
3498 if (strcmp(id, refs[i].id))
3499 continue;
3500
3501 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3502 if (!tmp) {
3503 if (ref_list)
3504 free(ref_list);
3505 return NULL;
3506 }
3507
3508 ref_list = tmp;
3509 if (ref_list_size > 0)
3510 ref_list[ref_list_size - 1]->next = 1;
3511 ref_list[ref_list_size] = &refs[i];
3512
3513 /* XXX: The properties of the commit chains ensures that we can
3514 * safely modify the shared ref. The repo references will
3515 * always be similar for the same id. */
3516 ref_list[ref_list_size]->next = 0;
3517 ref_list_size++;
3518 }
3519
3520 if (ref_list)
3521 id_refs[id_refs_size++] = ref_list;
3522
3523 return ref_list;
3524 }
3525
3526 static int
3527 read_ref(char *id, int idlen, char *name, int namelen)
3528 {
3529 struct ref *ref;
3530 bool tag = FALSE;
3531
3532 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3533 /* Commits referenced by tags has "^{}" appended. */
3534 if (name[namelen - 1] != '}')
3535 return OK;
3536
3537 while (namelen > 0 && name[namelen] != '^')
3538 namelen--;
3539
3540 tag = TRUE;
3541 namelen -= STRING_SIZE("refs/tags/");
3542 name += STRING_SIZE("refs/tags/");
3543
3544 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3545 namelen -= STRING_SIZE("refs/heads/");
3546 name += STRING_SIZE("refs/heads/");
3547
3548 } else if (!strcmp(name, "HEAD")) {
3549 return OK;
3550 }
3551
3552 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3553 if (!refs)
3554 return ERR;
3555
3556 ref = &refs[refs_size++];
3557 ref->name = malloc(namelen + 1);
3558 if (!ref->name)
3559 return ERR;
3560
3561 strncpy(ref->name, name, namelen);
3562 ref->name[namelen] = 0;
3563 ref->tag = tag;
3564 string_copy(ref->id, id);
3565
3566 return OK;
3567 }
3568
3569 static int
3570 load_refs(void)
3571 {
3572 const char *cmd_env = getenv("TIG_LS_REMOTE");
3573 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3574
3575 return read_properties(popen(cmd, "r"), "\t", read_ref);
3576 }
3577
3578 static int
3579 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3580 {
3581 if (!strcmp(name, "i18n.commitencoding"))
3582 string_copy(opt_encoding, value);
3583
3584 return OK;
3585 }
3586
3587 static int
3588 load_repo_config(void)
3589 {
3590 return read_properties(popen("git repo-config --list", "r"),
3591 "=", read_repo_config_option);
3592 }
3593
3594 static int
3595 read_properties(FILE *pipe, const char *separators,
3596 int (*read_property)(char *, int, char *, int))
3597 {
3598 char buffer[BUFSIZ];
3599 char *name;
3600 int state = OK;
3601
3602 if (!pipe)
3603 return ERR;
3604
3605 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3606 char *value;
3607 size_t namelen;
3608 size_t valuelen;
3609
3610 name = chomp_string(name);
3611 namelen = strcspn(name, separators);
3612
3613 if (name[namelen]) {
3614 name[namelen] = 0;
3615 value = chomp_string(name + namelen + 1);
3616 valuelen = strlen(value);
3617
3618 } else {
3619 value = "";
3620 valuelen = 0;
3621 }
3622
3623 state = read_property(name, namelen, value, valuelen);
3624 }
3625
3626 if (state != ERR && ferror(pipe))
3627 state = ERR;
3628
3629 pclose(pipe);
3630
3631 return state;
3632 }
3633
3634
3635 /*
3636 * Main
3637 */
3638
3639 static void __NORETURN
3640 quit(int sig)
3641 {
3642 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3643 if (cursed)
3644 endwin();
3645 exit(0);
3646 }
3647
3648 static void __NORETURN
3649 die(const char *err, ...)
3650 {
3651 va_list args;
3652
3653 endwin();
3654
3655 va_start(args, err);
3656 fputs("tig: ", stderr);
3657 vfprintf(stderr, err, args);
3658 fputs("\n", stderr);
3659 va_end(args);
3660
3661 exit(1);
3662 }
3663
3664 int
3665 main(int argc, char *argv[])
3666 {
3667 struct view *view;
3668 enum request request;
3669 size_t i;
3670
3671 signal(SIGINT, quit);
3672
3673 if (setlocale(LC_ALL, "")) {
3674 string_copy(opt_codeset, nl_langinfo(CODESET));
3675 }
3676
3677 if (load_options() == ERR)
3678 die("Failed to load user config.");
3679
3680 /* Load the repo config file so options can be overwritten from
3681 * the command line. */
3682 if (load_repo_config() == ERR)
3683 die("Failed to load repo config.");
3684
3685 if (!parse_options(argc, argv))
3686 return 0;
3687
3688 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3689 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3690 if (opt_iconv == ICONV_NONE)
3691 die("Failed to initialize character set conversion");
3692 }
3693
3694 if (load_refs() == ERR)
3695 die("Failed to load refs.");
3696
3697 /* Require a git repository unless when running in pager mode. */
3698 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3699 die("Not a git repository");
3700
3701 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3702 view->cmd_env = getenv(view->cmd_env);
3703
3704 request = opt_request;
3705
3706 init_display();
3707
3708 while (view_driver(display[current_view], request)) {
3709 int key;
3710 int i;
3711
3712 foreach_view (view, i)
3713 update_view(view);
3714
3715 /* Refresh, accept single keystroke of input */
3716 key = wgetch(status_win);
3717
3718 request = get_keybinding(display[current_view]->keymap, key);
3719
3720 /* Some low-level request handling. This keeps access to
3721 * status_win restricted. */
3722 switch (request) {
3723 case REQ_PROMPT:
3724 {
3725 char *cmd = read_prompt(":");
3726
3727 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3728 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3729 opt_request = REQ_VIEW_DIFF;
3730 } else {
3731 opt_request = REQ_VIEW_PAGER;
3732 }
3733 break;
3734 }
3735
3736 request = REQ_NONE;
3737 break;
3738 }
3739 case REQ_SEARCH:
3740 case REQ_SEARCH_BACK:
3741 {
3742 const char *prompt = request == REQ_SEARCH
3743 ? "/" : "?";
3744 char *search = read_prompt(prompt);
3745
3746 if (search)
3747 string_copy(opt_search, search);
3748 else
3749 request = REQ_NONE;
3750 break;
3751 }
3752 case REQ_SCREEN_RESIZE:
3753 {
3754 int height, width;
3755
3756 getmaxyx(stdscr, height, width);
3757
3758 /* Resize the status view and let the view driver take
3759 * care of resizing the displayed views. */
3760 wresize(status_win, 1, width);
3761 mvwin(status_win, height - 1, 0);
3762 wrefresh(status_win);
3763 break;
3764 }
3765 default:
3766 break;
3767 }
3768 }
3769
3770 quit(0);
3771
3772 return 0;
3773 }
Full-screen terminal Git browser.