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[tig] / tig.c
1 /* Copyright (c) 2006 Jonas Fonseca <fonseca@diku.dk>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #ifndef VERSION
15 #define VERSION "tig-0.4.git"
16 #endif
17
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
32
33 #include <sys/types.h>
34 #include <regex.h>
35
36 #include <locale.h>
37 #include <langinfo.h>
38 #include <iconv.h>
39
40 #include <curses.h>
41
42 #if __GNUC__ >= 3
43 #define __NORETURN __attribute__((__noreturn__))
44 #else
45 #define __NORETURN
46 #endif
47
48 static void __NORETURN die(const char *err, ...);
49 static void report(const char *msg, ...);
50 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
51 static void set_nonblocking_input(bool loading);
52 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
53
54 #define ABS(x) ((x) >= 0 ? (x) : -(x))
55 #define MIN(x, y) ((x) < (y) ? (x) : (y))
56
57 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
58 #define STRING_SIZE(x) (sizeof(x) - 1)
59
60 #define SIZEOF_STR 1024 /* Default string size. */
61 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
62 #define SIZEOF_REV 41 /* Holds a SHA-1 and an ending NUL */
63
64 /* Revision graph */
65
66 #define REVGRAPH_INIT 'I'
67 #define REVGRAPH_MERGE 'M'
68 #define REVGRAPH_BRANCH '+'
69 #define REVGRAPH_COMMIT '*'
70 #define REVGRAPH_LINE '|'
71
72 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
73
74 /* This color name can be used to refer to the default term colors. */
75 #define COLOR_DEFAULT (-1)
76
77 #define ICONV_NONE ((iconv_t) -1)
78
79 /* The format and size of the date column in the main view. */
80 #define DATE_FORMAT "%Y-%m-%d %H:%M"
81 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
82
83 #define AUTHOR_COLS 20
84
85 /* The default interval between line numbers. */
86 #define NUMBER_INTERVAL 1
87
88 #define TABSIZE 8
89
90 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
91
92 #define TIG_LS_REMOTE \
93 "git ls-remote . 2>/dev/null"
94
95 #define TIG_DIFF_CMD \
96 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
97
98 #define TIG_LOG_CMD \
99 "git log --cc --stat -n100 %s 2>/dev/null"
100
101 #define TIG_MAIN_CMD \
102 "git log --topo-order --pretty=raw %s 2>/dev/null"
103
104 #define TIG_TREE_CMD \
105 "git ls-tree %s %s"
106
107 #define TIG_BLOB_CMD \
108 "git cat-file blob %s"
109
110 /* XXX: Needs to be defined to the empty string. */
111 #define TIG_HELP_CMD ""
112 #define TIG_PAGER_CMD ""
113
114 /* Some ascii-shorthands fitted into the ncurses namespace. */
115 #define KEY_TAB '\t'
116 #define KEY_RETURN '\r'
117 #define KEY_ESC 27
118
119
120 struct ref {
121 char *name; /* Ref name; tag or head names are shortened. */
122 char id[SIZEOF_REV]; /* Commit SHA1 ID */
123 unsigned int tag:1; /* Is it a tag? */
124 unsigned int next:1; /* For ref lists: are there more refs? */
125 };
126
127 static struct ref **get_refs(char *id);
128
129 struct int_map {
130 const char *name;
131 int namelen;
132 int value;
133 };
134
135 static int
136 set_from_int_map(struct int_map *map, size_t map_size,
137 int *value, const char *name, int namelen)
138 {
139
140 int i;
141
142 for (i = 0; i < map_size; i++)
143 if (namelen == map[i].namelen &&
144 !strncasecmp(name, map[i].name, namelen)) {
145 *value = map[i].value;
146 return OK;
147 }
148
149 return ERR;
150 }
151
152
153 /*
154 * String helpers
155 */
156
157 static inline void
158 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
159 {
160 if (srclen > dstlen - 1)
161 srclen = dstlen - 1;
162
163 strncpy(dst, src, srclen);
164 dst[srclen] = 0;
165 }
166
167 /* Shorthands for safely copying into a fixed buffer. */
168
169 #define string_copy(dst, src) \
170 string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
171
172 #define string_ncopy(dst, src, srclen) \
173 string_ncopy_do(dst, sizeof(dst), src, srclen)
174
175 static char *
176 chomp_string(char *name)
177 {
178 int namelen;
179
180 while (isspace(*name))
181 name++;
182
183 namelen = strlen(name) - 1;
184 while (namelen > 0 && isspace(name[namelen]))
185 name[namelen--] = 0;
186
187 return name;
188 }
189
190 static bool
191 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
192 {
193 va_list args;
194 size_t pos = bufpos ? *bufpos : 0;
195
196 va_start(args, fmt);
197 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
198 va_end(args);
199
200 if (bufpos)
201 *bufpos = pos;
202
203 return pos >= bufsize ? FALSE : TRUE;
204 }
205
206 #define string_format(buf, fmt, args...) \
207 string_nformat(buf, sizeof(buf), NULL, fmt, args)
208
209 #define string_format_from(buf, from, fmt, args...) \
210 string_nformat(buf, sizeof(buf), from, fmt, args)
211
212 static int
213 string_enum_compare(const char *str1, const char *str2, int len)
214 {
215 size_t i;
216
217 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
218
219 /* Diff-Header == DIFF_HEADER */
220 for (i = 0; i < len; i++) {
221 if (toupper(str1[i]) == toupper(str2[i]))
222 continue;
223
224 if (string_enum_sep(str1[i]) &&
225 string_enum_sep(str2[i]))
226 continue;
227
228 return str1[i] - str2[i];
229 }
230
231 return 0;
232 }
233
234 /* Shell quoting
235 *
236 * NOTE: The following is a slightly modified copy of the git project's shell
237 * quoting routines found in the quote.c file.
238 *
239 * Help to copy the thing properly quoted for the shell safety. any single
240 * quote is replaced with '\'', any exclamation point is replaced with '\!',
241 * and the whole thing is enclosed in a
242 *
243 * E.g.
244 * original sq_quote result
245 * name ==> name ==> 'name'
246 * a b ==> a b ==> 'a b'
247 * a'b ==> a'\''b ==> 'a'\''b'
248 * a!b ==> a'\!'b ==> 'a'\!'b'
249 */
250
251 static size_t
252 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
253 {
254 char c;
255
256 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
257
258 BUFPUT('\'');
259 while ((c = *src++)) {
260 if (c == '\'' || c == '!') {
261 BUFPUT('\'');
262 BUFPUT('\\');
263 BUFPUT(c);
264 BUFPUT('\'');
265 } else {
266 BUFPUT(c);
267 }
268 }
269 BUFPUT('\'');
270
271 return bufsize;
272 }
273
274
275 /*
276 * User requests
277 */
278
279 #define REQ_INFO \
280 /* XXX: Keep the view request first and in sync with views[]. */ \
281 REQ_GROUP("View switching") \
282 REQ_(VIEW_MAIN, "Show main view"), \
283 REQ_(VIEW_DIFF, "Show diff view"), \
284 REQ_(VIEW_LOG, "Show log view"), \
285 REQ_(VIEW_TREE, "Show tree view"), \
286 REQ_(VIEW_BLOB, "Show blob view"), \
287 REQ_(VIEW_HELP, "Show help page"), \
288 REQ_(VIEW_PAGER, "Show pager view"), \
289 \
290 REQ_GROUP("View manipulation") \
291 REQ_(ENTER, "Enter current line and scroll"), \
292 REQ_(NEXT, "Move to next"), \
293 REQ_(PREVIOUS, "Move to previous"), \
294 REQ_(VIEW_NEXT, "Move focus to next view"), \
295 REQ_(VIEW_CLOSE, "Close the current view"), \
296 REQ_(QUIT, "Close all views and quit"), \
297 \
298 REQ_GROUP("Cursor navigation") \
299 REQ_(MOVE_UP, "Move cursor one line up"), \
300 REQ_(MOVE_DOWN, "Move cursor one line down"), \
301 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
302 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
303 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
304 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
305 \
306 REQ_GROUP("Scrolling") \
307 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
308 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
309 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
310 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
311 \
312 REQ_GROUP("Searching") \
313 REQ_(SEARCH, "Search the view"), \
314 REQ_(SEARCH_BACK, "Search backwards in the view"), \
315 REQ_(FIND_NEXT, "Find next search match"), \
316 REQ_(FIND_PREV, "Find previous search match"), \
317 \
318 REQ_GROUP("Misc") \
319 REQ_(NONE, "Do nothing"), \
320 REQ_(PROMPT, "Bring up the prompt"), \
321 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
322 REQ_(SCREEN_RESIZE, "Resize the screen"), \
323 REQ_(SHOW_VERSION, "Show version information"), \
324 REQ_(STOP_LOADING, "Stop all loading views"), \
325 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
326 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
327
328
329 /* User action requests. */
330 enum request {
331 #define REQ_GROUP(help)
332 #define REQ_(req, help) REQ_##req
333
334 /* Offset all requests to avoid conflicts with ncurses getch values. */
335 REQ_OFFSET = KEY_MAX + 1,
336 REQ_INFO,
337 REQ_UNKNOWN,
338
339 #undef REQ_GROUP
340 #undef REQ_
341 };
342
343 struct request_info {
344 enum request request;
345 char *name;
346 int namelen;
347 char *help;
348 };
349
350 static struct request_info req_info[] = {
351 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
352 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
353 REQ_INFO
354 #undef REQ_GROUP
355 #undef REQ_
356 };
357
358 static enum request
359 get_request(const char *name)
360 {
361 int namelen = strlen(name);
362 int i;
363
364 for (i = 0; i < ARRAY_SIZE(req_info); i++)
365 if (req_info[i].namelen == namelen &&
366 !string_enum_compare(req_info[i].name, name, namelen))
367 return req_info[i].request;
368
369 return REQ_UNKNOWN;
370 }
371
372
373 /*
374 * Options
375 */
376
377 static const char usage[] =
378 VERSION " (" __DATE__ ")\n"
379 "\n"
380 "Usage: tig [options]\n"
381 " or: tig [options] [--] [git log options]\n"
382 " or: tig [options] log [git log options]\n"
383 " or: tig [options] diff [git diff options]\n"
384 " or: tig [options] show [git show options]\n"
385 " or: tig [options] < [git command output]\n"
386 "\n"
387 "Options:\n"
388 " -l Start up in log view\n"
389 " -d Start up in diff view\n"
390 " -n[I], --line-number[=I] Show line numbers with given interval\n"
391 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
392 " -- Mark end of tig options\n"
393 " -v, --version Show version and exit\n"
394 " -h, --help Show help message and exit\n";
395
396 /* Option and state variables. */
397 static bool opt_line_number = FALSE;
398 static bool opt_rev_graph = TRUE;
399 static int opt_num_interval = NUMBER_INTERVAL;
400 static int opt_tab_size = TABSIZE;
401 static enum request opt_request = REQ_VIEW_MAIN;
402 static char opt_cmd[SIZEOF_STR] = "";
403 static char opt_path[SIZEOF_STR] = "";
404 static FILE *opt_pipe = NULL;
405 static char opt_encoding[20] = "UTF-8";
406 static bool opt_utf8 = TRUE;
407 static char opt_codeset[20] = "UTF-8";
408 static iconv_t opt_iconv = ICONV_NONE;
409 static char opt_search[SIZEOF_STR] = "";
410
411 enum option_type {
412 OPT_NONE,
413 OPT_INT,
414 };
415
416 static bool
417 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
418 {
419 va_list args;
420 char *value = "";
421 int *number;
422
423 if (opt[0] != '-')
424 return FALSE;
425
426 if (opt[1] == '-') {
427 int namelen = strlen(name);
428
429 opt += 2;
430
431 if (strncmp(opt, name, namelen))
432 return FALSE;
433
434 if (opt[namelen] == '=')
435 value = opt + namelen + 1;
436
437 } else {
438 if (!short_name || opt[1] != short_name)
439 return FALSE;
440 value = opt + 2;
441 }
442
443 va_start(args, type);
444 if (type == OPT_INT) {
445 number = va_arg(args, int *);
446 if (isdigit(*value))
447 *number = atoi(value);
448 }
449 va_end(args);
450
451 return TRUE;
452 }
453
454 /* Returns the index of log or diff command or -1 to exit. */
455 static bool
456 parse_options(int argc, char *argv[])
457 {
458 int i;
459
460 for (i = 1; i < argc; i++) {
461 char *opt = argv[i];
462
463 if (!strcmp(opt, "-l")) {
464 opt_request = REQ_VIEW_LOG;
465 continue;
466 }
467
468 if (!strcmp(opt, "-d")) {
469 opt_request = REQ_VIEW_DIFF;
470 continue;
471 }
472
473 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
474 opt_line_number = TRUE;
475 continue;
476 }
477
478 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
479 opt_tab_size = MIN(opt_tab_size, TABSIZE);
480 continue;
481 }
482
483 if (check_option(opt, 'v', "version", OPT_NONE)) {
484 printf("tig version %s\n", VERSION);
485 return FALSE;
486 }
487
488 if (check_option(opt, 'h', "help", OPT_NONE)) {
489 printf(usage);
490 return FALSE;
491 }
492
493 if (!strcmp(opt, "--")) {
494 i++;
495 break;
496 }
497
498 if (!strcmp(opt, "log") ||
499 !strcmp(opt, "diff") ||
500 !strcmp(opt, "show")) {
501 opt_request = opt[0] == 'l'
502 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
503 break;
504 }
505
506 if (opt[0] && opt[0] != '-')
507 break;
508
509 die("unknown option '%s'\n\n%s", opt, usage);
510 }
511
512 if (!isatty(STDIN_FILENO)) {
513 opt_request = REQ_VIEW_PAGER;
514 opt_pipe = stdin;
515
516 } else if (i < argc) {
517 size_t buf_size;
518
519 if (opt_request == REQ_VIEW_MAIN)
520 /* XXX: This is vulnerable to the user overriding
521 * options required for the main view parser. */
522 string_copy(opt_cmd, "git log --stat --pretty=raw");
523 else
524 string_copy(opt_cmd, "git");
525 buf_size = strlen(opt_cmd);
526
527 while (buf_size < sizeof(opt_cmd) && i < argc) {
528 opt_cmd[buf_size++] = ' ';
529 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
530 }
531
532 if (buf_size >= sizeof(opt_cmd))
533 die("command too long");
534
535 opt_cmd[buf_size] = 0;
536
537 }
538
539 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
540 opt_utf8 = FALSE;
541
542 return TRUE;
543 }
544
545
546 /*
547 * Line-oriented content detection.
548 */
549
550 #define LINE_INFO \
551 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
552 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
553 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
554 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
555 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
556 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
557 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
558 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
559 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
560 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
561 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
562 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
563 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
564 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
565 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
566 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
567 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
568 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
569 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
570 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
571 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
572 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
573 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
574 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
575 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
576 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
577 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
578 LINE(ACKED, " Acked-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
579 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
580 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
581 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
582 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
583 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
584 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
585 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
586 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
587 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
588 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
589 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
590 LINE(TREE_DIR, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
591 LINE(TREE_FILE, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL)
592
593 enum line_type {
594 #define LINE(type, line, fg, bg, attr) \
595 LINE_##type
596 LINE_INFO
597 #undef LINE
598 };
599
600 struct line_info {
601 const char *name; /* Option name. */
602 int namelen; /* Size of option name. */
603 const char *line; /* The start of line to match. */
604 int linelen; /* Size of string to match. */
605 int fg, bg, attr; /* Color and text attributes for the lines. */
606 };
607
608 static struct line_info line_info[] = {
609 #define LINE(type, line, fg, bg, attr) \
610 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
611 LINE_INFO
612 #undef LINE
613 };
614
615 static enum line_type
616 get_line_type(char *line)
617 {
618 int linelen = strlen(line);
619 enum line_type type;
620
621 for (type = 0; type < ARRAY_SIZE(line_info); type++)
622 /* Case insensitive search matches Signed-off-by lines better. */
623 if (linelen >= line_info[type].linelen &&
624 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
625 return type;
626
627 return LINE_DEFAULT;
628 }
629
630 static inline int
631 get_line_attr(enum line_type type)
632 {
633 assert(type < ARRAY_SIZE(line_info));
634 return COLOR_PAIR(type) | line_info[type].attr;
635 }
636
637 static struct line_info *
638 get_line_info(char *name, int namelen)
639 {
640 enum line_type type;
641
642 for (type = 0; type < ARRAY_SIZE(line_info); type++)
643 if (namelen == line_info[type].namelen &&
644 !string_enum_compare(line_info[type].name, name, namelen))
645 return &line_info[type];
646
647 return NULL;
648 }
649
650 static void
651 init_colors(void)
652 {
653 int default_bg = COLOR_BLACK;
654 int default_fg = COLOR_WHITE;
655 enum line_type type;
656
657 start_color();
658
659 if (use_default_colors() != ERR) {
660 default_bg = -1;
661 default_fg = -1;
662 }
663
664 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
665 struct line_info *info = &line_info[type];
666 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
667 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
668
669 init_pair(type, fg, bg);
670 }
671 }
672
673 struct line {
674 enum line_type type;
675
676 /* State flags */
677 unsigned int selected:1;
678
679 void *data; /* User data */
680 };
681
682
683 /*
684 * Keys
685 */
686
687 struct keybinding {
688 int alias;
689 enum request request;
690 struct keybinding *next;
691 };
692
693 static struct keybinding default_keybindings[] = {
694 /* View switching */
695 { 'm', REQ_VIEW_MAIN },
696 { 'd', REQ_VIEW_DIFF },
697 { 'l', REQ_VIEW_LOG },
698 { 't', REQ_VIEW_TREE },
699 { 'f', REQ_VIEW_BLOB },
700 { 'p', REQ_VIEW_PAGER },
701 { 'h', REQ_VIEW_HELP },
702
703 /* View manipulation */
704 { 'q', REQ_VIEW_CLOSE },
705 { KEY_TAB, REQ_VIEW_NEXT },
706 { KEY_RETURN, REQ_ENTER },
707 { KEY_UP, REQ_PREVIOUS },
708 { KEY_DOWN, REQ_NEXT },
709
710 /* Cursor navigation */
711 { 'k', REQ_MOVE_UP },
712 { 'j', REQ_MOVE_DOWN },
713 { KEY_HOME, REQ_MOVE_FIRST_LINE },
714 { KEY_END, REQ_MOVE_LAST_LINE },
715 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
716 { ' ', REQ_MOVE_PAGE_DOWN },
717 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
718 { 'b', REQ_MOVE_PAGE_UP },
719 { '-', REQ_MOVE_PAGE_UP },
720
721 /* Scrolling */
722 { KEY_IC, REQ_SCROLL_LINE_UP },
723 { KEY_DC, REQ_SCROLL_LINE_DOWN },
724 { 'w', REQ_SCROLL_PAGE_UP },
725 { 's', REQ_SCROLL_PAGE_DOWN },
726
727 /* Searching */
728 { '/', REQ_SEARCH },
729 { '?', REQ_SEARCH_BACK },
730 { 'n', REQ_FIND_NEXT },
731 { 'N', REQ_FIND_PREV },
732
733 /* Misc */
734 { 'Q', REQ_QUIT },
735 { 'z', REQ_STOP_LOADING },
736 { 'v', REQ_SHOW_VERSION },
737 { 'r', REQ_SCREEN_REDRAW },
738 { '.', REQ_TOGGLE_LINENO },
739 { 'g', REQ_TOGGLE_REV_GRAPH },
740 { ':', REQ_PROMPT },
741
742 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
743 { ERR, REQ_NONE },
744
745 /* Using the ncurses SIGWINCH handler. */
746 { KEY_RESIZE, REQ_SCREEN_RESIZE },
747 };
748
749 #define KEYMAP_INFO \
750 KEYMAP_(GENERIC), \
751 KEYMAP_(MAIN), \
752 KEYMAP_(DIFF), \
753 KEYMAP_(LOG), \
754 KEYMAP_(TREE), \
755 KEYMAP_(BLOB), \
756 KEYMAP_(PAGER), \
757 KEYMAP_(HELP) \
758
759 enum keymap {
760 #define KEYMAP_(name) KEYMAP_##name
761 KEYMAP_INFO
762 #undef KEYMAP_
763 };
764
765 static struct int_map keymap_table[] = {
766 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
767 KEYMAP_INFO
768 #undef KEYMAP_
769 };
770
771 #define set_keymap(map, name) \
772 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
773
774 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
775
776 static void
777 add_keybinding(enum keymap keymap, enum request request, int key)
778 {
779 struct keybinding *keybinding;
780
781 keybinding = calloc(1, sizeof(*keybinding));
782 if (!keybinding)
783 die("Failed to allocate keybinding");
784
785 keybinding->alias = key;
786 keybinding->request = request;
787 keybinding->next = keybindings[keymap];
788 keybindings[keymap] = keybinding;
789 }
790
791 /* Looks for a key binding first in the given map, then in the generic map, and
792 * lastly in the default keybindings. */
793 static enum request
794 get_keybinding(enum keymap keymap, int key)
795 {
796 struct keybinding *kbd;
797 int i;
798
799 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
800 if (kbd->alias == key)
801 return kbd->request;
802
803 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
804 if (kbd->alias == key)
805 return kbd->request;
806
807 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
808 if (default_keybindings[i].alias == key)
809 return default_keybindings[i].request;
810
811 return (enum request) key;
812 }
813
814
815 struct key {
816 char *name;
817 int value;
818 };
819
820 static struct key key_table[] = {
821 { "Enter", KEY_RETURN },
822 { "Space", ' ' },
823 { "Backspace", KEY_BACKSPACE },
824 { "Tab", KEY_TAB },
825 { "Escape", KEY_ESC },
826 { "Left", KEY_LEFT },
827 { "Right", KEY_RIGHT },
828 { "Up", KEY_UP },
829 { "Down", KEY_DOWN },
830 { "Insert", KEY_IC },
831 { "Delete", KEY_DC },
832 { "Hash", '#' },
833 { "Home", KEY_HOME },
834 { "End", KEY_END },
835 { "PageUp", KEY_PPAGE },
836 { "PageDown", KEY_NPAGE },
837 { "F1", KEY_F(1) },
838 { "F2", KEY_F(2) },
839 { "F3", KEY_F(3) },
840 { "F4", KEY_F(4) },
841 { "F5", KEY_F(5) },
842 { "F6", KEY_F(6) },
843 { "F7", KEY_F(7) },
844 { "F8", KEY_F(8) },
845 { "F9", KEY_F(9) },
846 { "F10", KEY_F(10) },
847 { "F11", KEY_F(11) },
848 { "F12", KEY_F(12) },
849 };
850
851 static int
852 get_key_value(const char *name)
853 {
854 int i;
855
856 for (i = 0; i < ARRAY_SIZE(key_table); i++)
857 if (!strcasecmp(key_table[i].name, name))
858 return key_table[i].value;
859
860 if (strlen(name) == 1 && isprint(*name))
861 return (int) *name;
862
863 return ERR;
864 }
865
866 static char *
867 get_key(enum request request)
868 {
869 static char buf[BUFSIZ];
870 static char key_char[] = "'X'";
871 size_t pos = 0;
872 char *sep = " ";
873 int i;
874
875 buf[pos] = 0;
876
877 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
878 struct keybinding *keybinding = &default_keybindings[i];
879 char *seq = NULL;
880 int key;
881
882 if (keybinding->request != request)
883 continue;
884
885 for (key = 0; key < ARRAY_SIZE(key_table); key++)
886 if (key_table[key].value == keybinding->alias)
887 seq = key_table[key].name;
888
889 if (seq == NULL &&
890 keybinding->alias < 127 &&
891 isprint(keybinding->alias)) {
892 key_char[1] = (char) keybinding->alias;
893 seq = key_char;
894 }
895
896 if (!seq)
897 seq = "'?'";
898
899 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
900 return "Too many keybindings!";
901 sep = ", ";
902 }
903
904 return buf;
905 }
906
907
908 /*
909 * User config file handling.
910 */
911
912 static struct int_map color_map[] = {
913 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
914 COLOR_MAP(DEFAULT),
915 COLOR_MAP(BLACK),
916 COLOR_MAP(BLUE),
917 COLOR_MAP(CYAN),
918 COLOR_MAP(GREEN),
919 COLOR_MAP(MAGENTA),
920 COLOR_MAP(RED),
921 COLOR_MAP(WHITE),
922 COLOR_MAP(YELLOW),
923 };
924
925 #define set_color(color, name) \
926 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
927
928 static struct int_map attr_map[] = {
929 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
930 ATTR_MAP(NORMAL),
931 ATTR_MAP(BLINK),
932 ATTR_MAP(BOLD),
933 ATTR_MAP(DIM),
934 ATTR_MAP(REVERSE),
935 ATTR_MAP(STANDOUT),
936 ATTR_MAP(UNDERLINE),
937 };
938
939 #define set_attribute(attr, name) \
940 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
941
942 static int config_lineno;
943 static bool config_errors;
944 static char *config_msg;
945
946 /* Wants: object fgcolor bgcolor [attr] */
947 static int
948 option_color_command(int argc, char *argv[])
949 {
950 struct line_info *info;
951
952 if (argc != 3 && argc != 4) {
953 config_msg = "Wrong number of arguments given to color command";
954 return ERR;
955 }
956
957 info = get_line_info(argv[0], strlen(argv[0]));
958 if (!info) {
959 config_msg = "Unknown color name";
960 return ERR;
961 }
962
963 if (set_color(&info->fg, argv[1]) == ERR ||
964 set_color(&info->bg, argv[2]) == ERR) {
965 config_msg = "Unknown color";
966 return ERR;
967 }
968
969 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
970 config_msg = "Unknown attribute";
971 return ERR;
972 }
973
974 return OK;
975 }
976
977 /* Wants: name = value */
978 static int
979 option_set_command(int argc, char *argv[])
980 {
981 if (argc != 3) {
982 config_msg = "Wrong number of arguments given to set command";
983 return ERR;
984 }
985
986 if (strcmp(argv[1], "=")) {
987 config_msg = "No value assigned";
988 return ERR;
989 }
990
991 if (!strcmp(argv[0], "show-rev-graph")) {
992 opt_rev_graph = (!strcmp(argv[2], "1") ||
993 !strcmp(argv[2], "true") ||
994 !strcmp(argv[2], "yes"));
995 return OK;
996 }
997
998 if (!strcmp(argv[0], "line-number-interval")) {
999 opt_num_interval = atoi(argv[2]);
1000 return OK;
1001 }
1002
1003 if (!strcmp(argv[0], "tab-size")) {
1004 opt_tab_size = atoi(argv[2]);
1005 return OK;
1006 }
1007
1008 if (!strcmp(argv[0], "commit-encoding")) {
1009 char *arg = argv[2];
1010 int delimiter = *arg;
1011 int i;
1012
1013 switch (delimiter) {
1014 case '"':
1015 case '\'':
1016 for (arg++, i = 0; arg[i]; i++)
1017 if (arg[i] == delimiter) {
1018 arg[i] = 0;
1019 break;
1020 }
1021 default:
1022 string_copy(opt_encoding, arg);
1023 return OK;
1024 }
1025 }
1026
1027 config_msg = "Unknown variable name";
1028 return ERR;
1029 }
1030
1031 /* Wants: mode request key */
1032 static int
1033 option_bind_command(int argc, char *argv[])
1034 {
1035 enum request request;
1036 int keymap;
1037 int key;
1038
1039 if (argc != 3) {
1040 config_msg = "Wrong number of arguments given to bind command";
1041 return ERR;
1042 }
1043
1044 if (set_keymap(&keymap, argv[0]) == ERR) {
1045 config_msg = "Unknown key map";
1046 return ERR;
1047 }
1048
1049 key = get_key_value(argv[1]);
1050 if (key == ERR) {
1051 config_msg = "Unknown key";
1052 return ERR;
1053 }
1054
1055 request = get_request(argv[2]);
1056 if (request == REQ_UNKNOWN) {
1057 config_msg = "Unknown request name";
1058 return ERR;
1059 }
1060
1061 add_keybinding(keymap, request, key);
1062
1063 return OK;
1064 }
1065
1066 static int
1067 set_option(char *opt, char *value)
1068 {
1069 char *argv[16];
1070 int valuelen;
1071 int argc = 0;
1072
1073 /* Tokenize */
1074 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1075 argv[argc++] = value;
1076
1077 value += valuelen;
1078 if (!*value)
1079 break;
1080
1081 *value++ = 0;
1082 while (isspace(*value))
1083 value++;
1084 }
1085
1086 if (!strcmp(opt, "color"))
1087 return option_color_command(argc, argv);
1088
1089 if (!strcmp(opt, "set"))
1090 return option_set_command(argc, argv);
1091
1092 if (!strcmp(opt, "bind"))
1093 return option_bind_command(argc, argv);
1094
1095 config_msg = "Unknown option command";
1096 return ERR;
1097 }
1098
1099 static int
1100 read_option(char *opt, int optlen, char *value, int valuelen)
1101 {
1102 int status = OK;
1103
1104 config_lineno++;
1105 config_msg = "Internal error";
1106
1107 /* Check for comment markers, since read_properties() will
1108 * only ensure opt and value are split at first " \t". */
1109 optlen = strcspn(opt, "#");
1110 if (optlen == 0)
1111 return OK;
1112
1113 if (opt[optlen] != 0) {
1114 config_msg = "No option value";
1115 status = ERR;
1116
1117 } else {
1118 /* Look for comment endings in the value. */
1119 int len = strcspn(value, "#");
1120
1121 if (len < valuelen) {
1122 valuelen = len;
1123 value[valuelen] = 0;
1124 }
1125
1126 status = set_option(opt, value);
1127 }
1128
1129 if (status == ERR) {
1130 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1131 config_lineno, optlen, opt, config_msg);
1132 config_errors = TRUE;
1133 }
1134
1135 /* Always keep going if errors are encountered. */
1136 return OK;
1137 }
1138
1139 static int
1140 load_options(void)
1141 {
1142 char *home = getenv("HOME");
1143 char buf[SIZEOF_STR];
1144 FILE *file;
1145
1146 config_lineno = 0;
1147 config_errors = FALSE;
1148
1149 if (!home || !string_format(buf, "%s/.tigrc", home))
1150 return ERR;
1151
1152 /* It's ok that the file doesn't exist. */
1153 file = fopen(buf, "r");
1154 if (!file)
1155 return OK;
1156
1157 if (read_properties(file, " \t", read_option) == ERR ||
1158 config_errors == TRUE)
1159 fprintf(stderr, "Errors while loading %s.\n", buf);
1160
1161 return OK;
1162 }
1163
1164
1165 /*
1166 * The viewer
1167 */
1168
1169 struct view;
1170 struct view_ops;
1171
1172 /* The display array of active views and the index of the current view. */
1173 static struct view *display[2];
1174 static unsigned int current_view;
1175
1176 #define foreach_displayed_view(view, i) \
1177 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1178
1179 #define displayed_views() (display[1] != NULL ? 2 : 1)
1180
1181 /* Current head and commit ID */
1182 static char ref_blob[SIZEOF_REF] = "";
1183 static char ref_commit[SIZEOF_REF] = "HEAD";
1184 static char ref_head[SIZEOF_REF] = "HEAD";
1185
1186 struct view {
1187 const char *name; /* View name */
1188 const char *cmd_fmt; /* Default command line format */
1189 const char *cmd_env; /* Command line set via environment */
1190 const char *id; /* Points to either of ref_{head,commit,blob} */
1191
1192 struct view_ops *ops; /* View operations */
1193
1194 enum keymap keymap; /* What keymap does this view have */
1195
1196 char cmd[SIZEOF_STR]; /* Command buffer */
1197 char ref[SIZEOF_REF]; /* Hovered commit reference */
1198 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
1199
1200 int height, width; /* The width and height of the main window */
1201 WINDOW *win; /* The main window */
1202 WINDOW *title; /* The title window living below the main window */
1203
1204 /* Navigation */
1205 unsigned long offset; /* Offset of the window top */
1206 unsigned long lineno; /* Current line number */
1207
1208 /* Searching */
1209 char grep[SIZEOF_STR]; /* Search string */
1210 regex_t *regex; /* Pre-compiled regex */
1211
1212 /* If non-NULL, points to the view that opened this view. If this view
1213 * is closed tig will switch back to the parent view. */
1214 struct view *parent;
1215
1216 /* Buffering */
1217 unsigned long lines; /* Total number of lines */
1218 struct line *line; /* Line index */
1219 unsigned long line_size;/* Total number of allocated lines */
1220 unsigned int digits; /* Number of digits in the lines member. */
1221
1222 /* Loading */
1223 FILE *pipe;
1224 time_t start_time;
1225 };
1226
1227 struct view_ops {
1228 /* What type of content being displayed. Used in the title bar. */
1229 const char *type;
1230 /* Draw one line; @lineno must be < view->height. */
1231 bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
1232 /* Read one line; updates view->line. */
1233 bool (*read)(struct view *view, char *data);
1234 /* Depending on view, change display based on current line. */
1235 bool (*enter)(struct view *view, struct line *line);
1236 /* Search for regex in a line. */
1237 bool (*grep)(struct view *view, struct line *line);
1238 /* Select line */
1239 void (*select)(struct view *view, struct line *line);
1240 };
1241
1242 static struct view_ops pager_ops;
1243 static struct view_ops main_ops;
1244 static struct view_ops tree_ops;
1245 static struct view_ops blob_ops;
1246
1247 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1248 { name, cmd, #env, ref, ops, map}
1249
1250 #define VIEW_(id, name, ops, ref) \
1251 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1252
1253
1254 static struct view views[] = {
1255 VIEW_(MAIN, "main", &main_ops, ref_head),
1256 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1257 VIEW_(LOG, "log", &pager_ops, ref_head),
1258 VIEW_(TREE, "tree", &tree_ops, ref_commit),
1259 VIEW_(BLOB, "blob", &blob_ops, ref_blob),
1260 VIEW_(HELP, "help", &pager_ops, "static"),
1261 VIEW_(PAGER, "pager", &pager_ops, "static"),
1262 };
1263
1264 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1265
1266 #define foreach_view(view, i) \
1267 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1268
1269 #define view_is_displayed(view) \
1270 (view == display[0] || view == display[1])
1271
1272 static bool
1273 draw_view_line(struct view *view, unsigned int lineno)
1274 {
1275 struct line *line;
1276 bool selected = (view->offset + lineno == view->lineno);
1277 bool draw_ok;
1278
1279 assert(view_is_displayed(view));
1280
1281 if (view->offset + lineno >= view->lines)
1282 return FALSE;
1283
1284 line = &view->line[view->offset + lineno];
1285
1286 if (selected) {
1287 line->selected = TRUE;
1288 view->ops->select(view, line);
1289 } else if (line->selected) {
1290 line->selected = FALSE;
1291 wmove(view->win, lineno, 0);
1292 wclrtoeol(view->win);
1293 }
1294
1295 scrollok(view->win, FALSE);
1296 draw_ok = view->ops->draw(view, line, lineno, selected);
1297 scrollok(view->win, TRUE);
1298
1299 return draw_ok;
1300 }
1301
1302 static void
1303 redraw_view_from(struct view *view, int lineno)
1304 {
1305 assert(0 <= lineno && lineno < view->height);
1306
1307 for (; lineno < view->height; lineno++) {
1308 if (!draw_view_line(view, lineno))
1309 break;
1310 }
1311
1312 redrawwin(view->win);
1313 wrefresh(view->win);
1314 }
1315
1316 static void
1317 redraw_view(struct view *view)
1318 {
1319 wclear(view->win);
1320 redraw_view_from(view, 0);
1321 }
1322
1323
1324 static void
1325 update_view_title(struct view *view)
1326 {
1327 char buf[SIZEOF_STR];
1328 char state[SIZEOF_STR];
1329 size_t bufpos = 0, statelen = 0;
1330
1331 assert(view_is_displayed(view));
1332
1333 if (view->lines || view->pipe) {
1334 unsigned int view_lines = view->offset + view->height;
1335 unsigned int lines = view->lines
1336 ? MIN(view_lines, view->lines) * 100 / view->lines
1337 : 0;
1338
1339 string_format_from(state, &statelen, "- %s %d of %d (%d%%)",
1340 view->ops->type,
1341 view->lineno + 1,
1342 view->lines,
1343 lines);
1344
1345 if (view->pipe) {
1346 time_t secs = time(NULL) - view->start_time;
1347
1348 /* Three git seconds are a long time ... */
1349 if (secs > 2)
1350 string_format_from(state, &statelen, " %lds", secs);
1351 }
1352 }
1353
1354 string_format_from(buf, &bufpos, "[%s]", view->name);
1355 if (*view->ref && bufpos < view->width) {
1356 size_t refsize = strlen(view->ref);
1357 size_t minsize = bufpos + 1 + /* abbrev= */ 7 + 1 + statelen;
1358
1359 if (minsize < view->width)
1360 refsize = view->width - minsize + 7;
1361 string_format_from(buf, &bufpos, " %.*s", refsize, view->ref);
1362 }
1363
1364 if (statelen && bufpos < view->width) {
1365 string_format_from(buf, &bufpos, " %s", state);
1366 }
1367
1368 if (view == display[current_view])
1369 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1370 else
1371 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1372
1373 werase(view->title);
1374 mvwaddnstr(view->title, 0, 0, buf, bufpos);
1375 wmove(view->title, 0, view->width - 1);
1376 wrefresh(view->title);
1377 }
1378
1379 static void
1380 resize_display(void)
1381 {
1382 int offset, i;
1383 struct view *base = display[0];
1384 struct view *view = display[1] ? display[1] : display[0];
1385
1386 /* Setup window dimensions */
1387
1388 getmaxyx(stdscr, base->height, base->width);
1389
1390 /* Make room for the status window. */
1391 base->height -= 1;
1392
1393 if (view != base) {
1394 /* Horizontal split. */
1395 view->width = base->width;
1396 view->height = SCALE_SPLIT_VIEW(base->height);
1397 base->height -= view->height;
1398
1399 /* Make room for the title bar. */
1400 view->height -= 1;
1401 }
1402
1403 /* Make room for the title bar. */
1404 base->height -= 1;
1405
1406 offset = 0;
1407
1408 foreach_displayed_view (view, i) {
1409 if (!view->win) {
1410 view->win = newwin(view->height, 0, offset, 0);
1411 if (!view->win)
1412 die("Failed to create %s view", view->name);
1413
1414 scrollok(view->win, TRUE);
1415
1416 view->title = newwin(1, 0, offset + view->height, 0);
1417 if (!view->title)
1418 die("Failed to create title window");
1419
1420 } else {
1421 wresize(view->win, view->height, view->width);
1422 mvwin(view->win, offset, 0);
1423 mvwin(view->title, offset + view->height, 0);
1424 }
1425
1426 offset += view->height + 1;
1427 }
1428 }
1429
1430 static void
1431 redraw_display(void)
1432 {
1433 struct view *view;
1434 int i;
1435
1436 foreach_displayed_view (view, i) {
1437 redraw_view(view);
1438 update_view_title(view);
1439 }
1440 }
1441
1442 static void
1443 update_display_cursor(struct view *view)
1444 {
1445 /* Move the cursor to the right-most column of the cursor line.
1446 *
1447 * XXX: This could turn out to be a bit expensive, but it ensures that
1448 * the cursor does not jump around. */
1449 if (view->lines) {
1450 wmove(view->win, view->lineno - view->offset, view->width - 1);
1451 wrefresh(view->win);
1452 }
1453 }
1454
1455 /*
1456 * Navigation
1457 */
1458
1459 /* Scrolling backend */
1460 static void
1461 do_scroll_view(struct view *view, int lines)
1462 {
1463 bool redraw_current_line = FALSE;
1464
1465 /* The rendering expects the new offset. */
1466 view->offset += lines;
1467
1468 assert(0 <= view->offset && view->offset < view->lines);
1469 assert(lines);
1470
1471 /* Move current line into the view. */
1472 if (view->lineno < view->offset) {
1473 view->lineno = view->offset;
1474 redraw_current_line = TRUE;
1475 } else if (view->lineno >= view->offset + view->height) {
1476 view->lineno = view->offset + view->height - 1;
1477 redraw_current_line = TRUE;
1478 }
1479
1480 assert(view->offset <= view->lineno && view->lineno < view->lines);
1481
1482 /* Redraw the whole screen if scrolling is pointless. */
1483 if (view->height < ABS(lines)) {
1484 redraw_view(view);
1485
1486 } else {
1487 int line = lines > 0 ? view->height - lines : 0;
1488 int end = line + ABS(lines);
1489
1490 wscrl(view->win, lines);
1491
1492 for (; line < end; line++) {
1493 if (!draw_view_line(view, line))
1494 break;
1495 }
1496
1497 if (redraw_current_line)
1498 draw_view_line(view, view->lineno - view->offset);
1499 }
1500
1501 redrawwin(view->win);
1502 wrefresh(view->win);
1503 report("");
1504 }
1505
1506 /* Scroll frontend */
1507 static void
1508 scroll_view(struct view *view, enum request request)
1509 {
1510 int lines = 1;
1511
1512 assert(view_is_displayed(view));
1513
1514 switch (request) {
1515 case REQ_SCROLL_PAGE_DOWN:
1516 lines = view->height;
1517 case REQ_SCROLL_LINE_DOWN:
1518 if (view->offset + lines > view->lines)
1519 lines = view->lines - view->offset;
1520
1521 if (lines == 0 || view->offset + view->height >= view->lines) {
1522 report("Cannot scroll beyond the last line");
1523 return;
1524 }
1525 break;
1526
1527 case REQ_SCROLL_PAGE_UP:
1528 lines = view->height;
1529 case REQ_SCROLL_LINE_UP:
1530 if (lines > view->offset)
1531 lines = view->offset;
1532
1533 if (lines == 0) {
1534 report("Cannot scroll beyond the first line");
1535 return;
1536 }
1537
1538 lines = -lines;
1539 break;
1540
1541 default:
1542 die("request %d not handled in switch", request);
1543 }
1544
1545 do_scroll_view(view, lines);
1546 }
1547
1548 /* Cursor moving */
1549 static void
1550 move_view(struct view *view, enum request request)
1551 {
1552 int scroll_steps = 0;
1553 int steps;
1554
1555 switch (request) {
1556 case REQ_MOVE_FIRST_LINE:
1557 steps = -view->lineno;
1558 break;
1559
1560 case REQ_MOVE_LAST_LINE:
1561 steps = view->lines - view->lineno - 1;
1562 break;
1563
1564 case REQ_MOVE_PAGE_UP:
1565 steps = view->height > view->lineno
1566 ? -view->lineno : -view->height;
1567 break;
1568
1569 case REQ_MOVE_PAGE_DOWN:
1570 steps = view->lineno + view->height >= view->lines
1571 ? view->lines - view->lineno - 1 : view->height;
1572 break;
1573
1574 case REQ_MOVE_UP:
1575 steps = -1;
1576 break;
1577
1578 case REQ_MOVE_DOWN:
1579 steps = 1;
1580 break;
1581
1582 default:
1583 die("request %d not handled in switch", request);
1584 }
1585
1586 if (steps <= 0 && view->lineno == 0) {
1587 report("Cannot move beyond the first line");
1588 return;
1589
1590 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1591 report("Cannot move beyond the last line");
1592 return;
1593 }
1594
1595 /* Move the current line */
1596 view->lineno += steps;
1597 assert(0 <= view->lineno && view->lineno < view->lines);
1598
1599 /* Check whether the view needs to be scrolled */
1600 if (view->lineno < view->offset ||
1601 view->lineno >= view->offset + view->height) {
1602 scroll_steps = steps;
1603 if (steps < 0 && -steps > view->offset) {
1604 scroll_steps = -view->offset;
1605
1606 } else if (steps > 0) {
1607 if (view->lineno == view->lines - 1 &&
1608 view->lines > view->height) {
1609 scroll_steps = view->lines - view->offset - 1;
1610 if (scroll_steps >= view->height)
1611 scroll_steps -= view->height - 1;
1612 }
1613 }
1614 }
1615
1616 if (!view_is_displayed(view)) {
1617 view->offset += steps;
1618 view->ops->select(view, &view->line[view->lineno]);
1619 return;
1620 }
1621
1622 /* Repaint the old "current" line if we be scrolling */
1623 if (ABS(steps) < view->height)
1624 draw_view_line(view, view->lineno - steps - view->offset);
1625
1626 if (scroll_steps) {
1627 do_scroll_view(view, scroll_steps);
1628 return;
1629 }
1630
1631 /* Draw the current line */
1632 draw_view_line(view, view->lineno - view->offset);
1633
1634 redrawwin(view->win);
1635 wrefresh(view->win);
1636 report("");
1637 }
1638
1639
1640 /*
1641 * Searching
1642 */
1643
1644 static void search_view(struct view *view, enum request request);
1645
1646 static bool
1647 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1648 {
1649 assert(view_is_displayed(view));
1650
1651 if (!view->ops->grep(view, line))
1652 return FALSE;
1653
1654 if (lineno - view->offset >= view->height) {
1655 view->offset = lineno;
1656 view->lineno = lineno;
1657 redraw_view(view);
1658
1659 } else {
1660 unsigned long old_lineno = view->lineno - view->offset;
1661
1662 view->lineno = lineno;
1663 draw_view_line(view, old_lineno);
1664
1665 draw_view_line(view, view->lineno - view->offset);
1666 redrawwin(view->win);
1667 wrefresh(view->win);
1668 }
1669
1670 report("Line %ld matches '%s'", lineno + 1, view->grep);
1671 return TRUE;
1672 }
1673
1674 static void
1675 find_next(struct view *view, enum request request)
1676 {
1677 unsigned long lineno = view->lineno;
1678 int direction;
1679
1680 if (!*view->grep) {
1681 if (!*opt_search)
1682 report("No previous search");
1683 else
1684 search_view(view, request);
1685 return;
1686 }
1687
1688 switch (request) {
1689 case REQ_SEARCH:
1690 case REQ_FIND_NEXT:
1691 direction = 1;
1692 break;
1693
1694 case REQ_SEARCH_BACK:
1695 case REQ_FIND_PREV:
1696 direction = -1;
1697 break;
1698
1699 default:
1700 return;
1701 }
1702
1703 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1704 lineno += direction;
1705
1706 /* Note, lineno is unsigned long so will wrap around in which case it
1707 * will become bigger than view->lines. */
1708 for (; lineno < view->lines; lineno += direction) {
1709 struct line *line = &view->line[lineno];
1710
1711 if (find_next_line(view, lineno, line))
1712 return;
1713 }
1714
1715 report("No match found for '%s'", view->grep);
1716 }
1717
1718 static void
1719 search_view(struct view *view, enum request request)
1720 {
1721 int regex_err;
1722
1723 if (view->regex) {
1724 regfree(view->regex);
1725 *view->grep = 0;
1726 } else {
1727 view->regex = calloc(1, sizeof(*view->regex));
1728 if (!view->regex)
1729 return;
1730 }
1731
1732 regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
1733 if (regex_err != 0) {
1734 char buf[SIZEOF_STR] = "unknown error";
1735
1736 regerror(regex_err, view->regex, buf, sizeof(buf));
1737 report("Search failed: %s", buf);
1738 return;
1739 }
1740
1741 string_copy(view->grep, opt_search);
1742
1743 find_next(view, request);
1744 }
1745
1746 /*
1747 * Incremental updating
1748 */
1749
1750 static void
1751 end_update(struct view *view)
1752 {
1753 if (!view->pipe)
1754 return;
1755 set_nonblocking_input(FALSE);
1756 if (view->pipe == stdin)
1757 fclose(view->pipe);
1758 else
1759 pclose(view->pipe);
1760 view->pipe = NULL;
1761 }
1762
1763 static bool
1764 begin_update(struct view *view)
1765 {
1766 const char *id = view->id;
1767
1768 if (view->pipe)
1769 end_update(view);
1770
1771 if (opt_cmd[0]) {
1772 string_copy(view->cmd, opt_cmd);
1773 opt_cmd[0] = 0;
1774 /* When running random commands, the view ref could have become
1775 * invalid so clear it. */
1776 view->ref[0] = 0;
1777
1778 } else if (view == VIEW(REQ_VIEW_TREE)) {
1779 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1780
1781 if (strcmp(view->vid, view->id))
1782 opt_path[0] = 0;
1783
1784 if (!string_format(view->cmd, format, id, opt_path))
1785 return FALSE;
1786
1787 } else {
1788 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1789
1790 if (!string_format(view->cmd, format, id, id, id, id, id))
1791 return FALSE;
1792 }
1793
1794 /* Special case for the pager view. */
1795 if (opt_pipe) {
1796 view->pipe = opt_pipe;
1797 opt_pipe = NULL;
1798 } else {
1799 view->pipe = popen(view->cmd, "r");
1800 }
1801
1802 if (!view->pipe)
1803 return FALSE;
1804
1805 set_nonblocking_input(TRUE);
1806
1807 view->offset = 0;
1808 view->lines = 0;
1809 view->lineno = 0;
1810 string_copy(view->vid, id);
1811
1812 if (view->line) {
1813 int i;
1814
1815 for (i = 0; i < view->lines; i++)
1816 if (view->line[i].data)
1817 free(view->line[i].data);
1818
1819 free(view->line);
1820 view->line = NULL;
1821 }
1822
1823 view->start_time = time(NULL);
1824
1825 return TRUE;
1826 }
1827
1828 static struct line *
1829 realloc_lines(struct view *view, size_t line_size)
1830 {
1831 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1832
1833 if (!tmp)
1834 return NULL;
1835
1836 view->line = tmp;
1837 view->line_size = line_size;
1838 return view->line;
1839 }
1840
1841 static bool
1842 update_view(struct view *view)
1843 {
1844 char in_buffer[BUFSIZ];
1845 char out_buffer[BUFSIZ * 2];
1846 char *line;
1847 /* The number of lines to read. If too low it will cause too much
1848 * redrawing (and possible flickering), if too high responsiveness
1849 * will suffer. */
1850 unsigned long lines = view->height;
1851 int redraw_from = -1;
1852
1853 if (!view->pipe)
1854 return TRUE;
1855
1856 /* Only redraw if lines are visible. */
1857 if (view->offset + view->height >= view->lines)
1858 redraw_from = view->lines - view->offset;
1859
1860 /* FIXME: This is probably not perfect for backgrounded views. */
1861 if (!realloc_lines(view, view->lines + lines))
1862 goto alloc_error;
1863
1864 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1865 size_t linelen = strlen(line);
1866
1867 if (linelen)
1868 line[linelen - 1] = 0;
1869
1870 if (opt_iconv != ICONV_NONE) {
1871 char *inbuf = line;
1872 size_t inlen = linelen;
1873
1874 char *outbuf = out_buffer;
1875 size_t outlen = sizeof(out_buffer);
1876
1877 size_t ret;
1878
1879 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1880 if (ret != (size_t) -1) {
1881 line = out_buffer;
1882 linelen = strlen(out_buffer);
1883 }
1884 }
1885
1886 if (!view->ops->read(view, line))
1887 goto alloc_error;
1888
1889 if (lines-- == 1)
1890 break;
1891 }
1892
1893 {
1894 int digits;
1895
1896 lines = view->lines;
1897 for (digits = 0; lines; digits++)
1898 lines /= 10;
1899
1900 /* Keep the displayed view in sync with line number scaling. */
1901 if (digits != view->digits) {
1902 view->digits = digits;
1903 redraw_from = 0;
1904 }
1905 }
1906
1907 if (!view_is_displayed(view))
1908 goto check_pipe;
1909
1910 if (view == VIEW(REQ_VIEW_TREE)) {
1911 /* Clear the view and redraw everything since the tree sorting
1912 * might have rearranged things. */
1913 redraw_view(view);
1914
1915 } else if (redraw_from >= 0) {
1916 /* If this is an incremental update, redraw the previous line
1917 * since for commits some members could have changed when
1918 * loading the main view. */
1919 if (redraw_from > 0)
1920 redraw_from--;
1921
1922 /* Incrementally draw avoids flickering. */
1923 redraw_view_from(view, redraw_from);
1924 }
1925
1926 /* Update the title _after_ the redraw so that if the redraw picks up a
1927 * commit reference in view->ref it'll be available here. */
1928 update_view_title(view);
1929
1930 check_pipe:
1931 if (ferror(view->pipe)) {
1932 report("Failed to read: %s", strerror(errno));
1933 goto end;
1934
1935 } else if (feof(view->pipe)) {
1936 report("");
1937 goto end;
1938 }
1939
1940 return TRUE;
1941
1942 alloc_error:
1943 report("Allocation failure");
1944
1945 end:
1946 view->ops->read(view, NULL);
1947 end_update(view);
1948 return FALSE;
1949 }
1950
1951
1952 /*
1953 * View opening
1954 */
1955
1956 static void open_help_view(struct view *view)
1957 {
1958 char buf[BUFSIZ];
1959 int lines = ARRAY_SIZE(req_info) + 2;
1960 int i;
1961
1962 if (view->lines > 0)
1963 return;
1964
1965 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1966 if (!req_info[i].request)
1967 lines++;
1968
1969 view->line = calloc(lines, sizeof(*view->line));
1970 if (!view->line) {
1971 report("Allocation failure");
1972 return;
1973 }
1974
1975 view->ops->read(view, "Quick reference for tig keybindings:");
1976
1977 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1978 char *key;
1979
1980 if (!req_info[i].request) {
1981 view->ops->read(view, "");
1982 view->ops->read(view, req_info[i].help);
1983 continue;
1984 }
1985
1986 key = get_key(req_info[i].request);
1987 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1988 continue;
1989
1990 view->ops->read(view, buf);
1991 }
1992 }
1993
1994 enum open_flags {
1995 OPEN_DEFAULT = 0, /* Use default view switching. */
1996 OPEN_SPLIT = 1, /* Split current view. */
1997 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1998 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1999 };
2000
2001 static void
2002 open_view(struct view *prev, enum request request, enum open_flags flags)
2003 {
2004 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
2005 bool split = !!(flags & OPEN_SPLIT);
2006 bool reload = !!(flags & OPEN_RELOAD);
2007 struct view *view = VIEW(request);
2008 int nviews = displayed_views();
2009 struct view *base_view = display[0];
2010
2011 if (view == prev && nviews == 1 && !reload) {
2012 report("Already in %s view", view->name);
2013 return;
2014 }
2015
2016 if (view == VIEW(REQ_VIEW_HELP)) {
2017 open_help_view(view);
2018
2019 } else if ((reload || strcmp(view->vid, view->id)) &&
2020 !begin_update(view)) {
2021 report("Failed to load %s view", view->name);
2022 return;
2023 }
2024
2025 if (split) {
2026 display[1] = view;
2027 if (!backgrounded)
2028 current_view = 1;
2029 } else {
2030 /* Maximize the current view. */
2031 memset(display, 0, sizeof(display));
2032 current_view = 0;
2033 display[current_view] = view;
2034 }
2035
2036 /* Resize the view when switching between split- and full-screen,
2037 * or when switching between two different full-screen views. */
2038 if (nviews != displayed_views() ||
2039 (nviews == 1 && base_view != display[0]))
2040 resize_display();
2041
2042 if (split && prev->lineno - prev->offset >= prev->height) {
2043 /* Take the title line into account. */
2044 int lines = prev->lineno - prev->offset - prev->height + 1;
2045
2046 /* Scroll the view that was split if the current line is
2047 * outside the new limited view. */
2048 do_scroll_view(prev, lines);
2049 }
2050
2051 if (prev && view != prev) {
2052 if (split && !backgrounded) {
2053 /* "Blur" the previous view. */
2054 update_view_title(prev);
2055 }
2056
2057 view->parent = prev;
2058 }
2059
2060 if (view->pipe && view->lines == 0) {
2061 /* Clear the old view and let the incremental updating refill
2062 * the screen. */
2063 wclear(view->win);
2064 report("");
2065 } else {
2066 redraw_view(view);
2067 report("");
2068 }
2069
2070 /* If the view is backgrounded the above calls to report()
2071 * won't redraw the view title. */
2072 if (backgrounded)
2073 update_view_title(view);
2074 }
2075
2076
2077 /*
2078 * User request switch noodle
2079 */
2080
2081 static int
2082 view_driver(struct view *view, enum request request)
2083 {
2084 int i;
2085
2086 switch (request) {
2087 case REQ_MOVE_UP:
2088 case REQ_MOVE_DOWN:
2089 case REQ_MOVE_PAGE_UP:
2090 case REQ_MOVE_PAGE_DOWN:
2091 case REQ_MOVE_FIRST_LINE:
2092 case REQ_MOVE_LAST_LINE:
2093 move_view(view, request);
2094 break;
2095
2096 case REQ_SCROLL_LINE_DOWN:
2097 case REQ_SCROLL_LINE_UP:
2098 case REQ_SCROLL_PAGE_DOWN:
2099 case REQ_SCROLL_PAGE_UP:
2100 scroll_view(view, request);
2101 break;
2102
2103 case REQ_VIEW_BLOB:
2104 if (!ref_blob[0]) {
2105 report("No file chosen, press 't' to open tree view");
2106 break;
2107 }
2108 /* Fall-through */
2109 case REQ_VIEW_MAIN:
2110 case REQ_VIEW_DIFF:
2111 case REQ_VIEW_LOG:
2112 case REQ_VIEW_TREE:
2113 case REQ_VIEW_HELP:
2114 case REQ_VIEW_PAGER:
2115 open_view(view, request, OPEN_DEFAULT);
2116 break;
2117
2118 case REQ_NEXT:
2119 case REQ_PREVIOUS:
2120 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2121
2122 if ((view == VIEW(REQ_VIEW_DIFF) &&
2123 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2124 (view == VIEW(REQ_VIEW_BLOB) &&
2125 view->parent == VIEW(REQ_VIEW_TREE))) {
2126 view = view->parent;
2127 move_view(view, request);
2128 if (view_is_displayed(view))
2129 update_view_title(view);
2130 } else {
2131 move_view(view, request);
2132 break;
2133 }
2134 /* Fall-through */
2135
2136 case REQ_ENTER:
2137 if (!view->lines) {
2138 report("Nothing to enter");
2139 break;
2140 }
2141 return view->ops->enter(view, &view->line[view->lineno]);
2142
2143 case REQ_VIEW_NEXT:
2144 {
2145 int nviews = displayed_views();
2146 int next_view = (current_view + 1) % nviews;
2147
2148 if (next_view == current_view) {
2149 report("Only one view is displayed");
2150 break;
2151 }
2152
2153 current_view = next_view;
2154 /* Blur out the title of the previous view. */
2155 update_view_title(view);
2156 report("");
2157 break;
2158 }
2159 case REQ_TOGGLE_LINENO:
2160 opt_line_number = !opt_line_number;
2161 redraw_display();
2162 break;
2163
2164 case REQ_TOGGLE_REV_GRAPH:
2165 opt_rev_graph = !opt_rev_graph;
2166 redraw_display();
2167 break;
2168
2169 case REQ_PROMPT:
2170 /* Always reload^Wrerun commands from the prompt. */
2171 open_view(view, opt_request, OPEN_RELOAD);
2172 break;
2173
2174 case REQ_SEARCH:
2175 case REQ_SEARCH_BACK:
2176 search_view(view, request);
2177 break;
2178
2179 case REQ_FIND_NEXT:
2180 case REQ_FIND_PREV:
2181 find_next(view, request);
2182 break;
2183
2184 case REQ_STOP_LOADING:
2185 for (i = 0; i < ARRAY_SIZE(views); i++) {
2186 view = &views[i];
2187 if (view->pipe)
2188 report("Stopped loading the %s view", view->name),
2189 end_update(view);
2190 }
2191 break;
2192
2193 case REQ_SHOW_VERSION:
2194 report("%s (built %s)", VERSION, __DATE__);
2195 return TRUE;
2196
2197 case REQ_SCREEN_RESIZE:
2198 resize_display();
2199 /* Fall-through */
2200 case REQ_SCREEN_REDRAW:
2201 redraw_display();
2202 break;
2203
2204 case REQ_NONE:
2205 doupdate();
2206 return TRUE;
2207
2208 case REQ_VIEW_CLOSE:
2209 /* XXX: Mark closed views by letting view->parent point to the
2210 * view itself. Parents to closed view should never be
2211 * followed. */
2212 if (view->parent &&
2213 view->parent->parent != view->parent) {
2214 memset(display, 0, sizeof(display));
2215 current_view = 0;
2216 display[current_view] = view->parent;
2217 view->parent = view;
2218 resize_display();
2219 redraw_display();
2220 break;
2221 }
2222 /* Fall-through */
2223 case REQ_QUIT:
2224 return FALSE;
2225
2226 default:
2227 /* An unknown key will show most commonly used commands. */
2228 report("Unknown key, press 'h' for help");
2229 return TRUE;
2230 }
2231
2232 return TRUE;
2233 }
2234
2235
2236 /*
2237 * Pager backend
2238 */
2239
2240 static bool
2241 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2242 {
2243 char *text = line->data;
2244 enum line_type type = line->type;
2245 int textlen = strlen(text);
2246 int attr;
2247
2248 wmove(view->win, lineno, 0);
2249
2250 if (selected) {
2251 type = LINE_CURSOR;
2252 wchgat(view->win, -1, 0, type, NULL);
2253 }
2254
2255 attr = get_line_attr(type);
2256 wattrset(view->win, attr);
2257
2258 if (opt_line_number || opt_tab_size < TABSIZE) {
2259 static char spaces[] = " ";
2260 int col_offset = 0, col = 0;
2261
2262 if (opt_line_number) {
2263 unsigned long real_lineno = view->offset + lineno + 1;
2264
2265 if (real_lineno == 1 ||
2266 (real_lineno % opt_num_interval) == 0) {
2267 wprintw(view->win, "%.*d", view->digits, real_lineno);
2268
2269 } else {
2270 waddnstr(view->win, spaces,
2271 MIN(view->digits, STRING_SIZE(spaces)));
2272 }
2273 waddstr(view->win, ": ");
2274 col_offset = view->digits + 2;
2275 }
2276
2277 while (text && col_offset + col < view->width) {
2278 int cols_max = view->width - col_offset - col;
2279 char *pos = text;
2280 int cols;
2281
2282 if (*text == '\t') {
2283 text++;
2284 assert(sizeof(spaces) > TABSIZE);
2285 pos = spaces;
2286 cols = opt_tab_size - (col % opt_tab_size);
2287
2288 } else {
2289 text = strchr(text, '\t');
2290 cols = line ? text - pos : strlen(pos);
2291 }
2292
2293 waddnstr(view->win, pos, MIN(cols, cols_max));
2294 col += cols;
2295 }
2296
2297 } else {
2298 int col = 0, pos = 0;
2299
2300 for (; pos < textlen && col < view->width; pos++, col++)
2301 if (text[pos] == '\t')
2302 col += TABSIZE - (col % TABSIZE) - 1;
2303
2304 waddnstr(view->win, text, pos);
2305 }
2306
2307 return TRUE;
2308 }
2309
2310 static bool
2311 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2312 {
2313 char refbuf[SIZEOF_STR];
2314 char *ref = NULL;
2315 FILE *pipe;
2316
2317 if (!string_format(refbuf, "git describe %s", commit_id))
2318 return TRUE;
2319
2320 pipe = popen(refbuf, "r");
2321 if (!pipe)
2322 return TRUE;
2323
2324 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2325 ref = chomp_string(ref);
2326 pclose(pipe);
2327
2328 if (!ref || !*ref)
2329 return TRUE;
2330
2331 /* This is the only fatal call, since it can "corrupt" the buffer. */
2332 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2333 return FALSE;
2334
2335 return TRUE;
2336 }
2337
2338 static void
2339 add_pager_refs(struct view *view, struct line *line)
2340 {
2341 char buf[SIZEOF_STR];
2342 char *commit_id = line->data + STRING_SIZE("commit ");
2343 struct ref **refs;
2344 size_t bufpos = 0, refpos = 0;
2345 const char *sep = "Refs: ";
2346 bool is_tag = FALSE;
2347
2348 assert(line->type == LINE_COMMIT);
2349
2350 refs = get_refs(commit_id);
2351 if (!refs) {
2352 if (view == VIEW(REQ_VIEW_DIFF))
2353 goto try_add_describe_ref;
2354 return;
2355 }
2356
2357 do {
2358 struct ref *ref = refs[refpos];
2359 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2360
2361 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2362 return;
2363 sep = ", ";
2364 if (ref->tag)
2365 is_tag = TRUE;
2366 } while (refs[refpos++]->next);
2367
2368 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2369 try_add_describe_ref:
2370 /* Add <tag>-g<commit_id> "fake" reference. */
2371 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2372 return;
2373 }
2374
2375 if (bufpos == 0)
2376 return;
2377
2378 if (!realloc_lines(view, view->line_size + 1))
2379 return;
2380
2381 line = &view->line[view->lines];
2382 line->data = strdup(buf);
2383 if (!line->data)
2384 return;
2385
2386 line->type = LINE_PP_REFS;
2387 view->lines++;
2388 }
2389
2390 static bool
2391 pager_read(struct view *view, char *data)
2392 {
2393 struct line *line = &view->line[view->lines];
2394
2395 if (!data)
2396 return TRUE;
2397
2398 line->data = strdup(data);
2399 if (!line->data)
2400 return FALSE;
2401
2402 line->type = get_line_type(line->data);
2403 view->lines++;
2404
2405 if (line->type == LINE_COMMIT &&
2406 (view == VIEW(REQ_VIEW_DIFF) ||
2407 view == VIEW(REQ_VIEW_LOG)))
2408 add_pager_refs(view, line);
2409
2410 return TRUE;
2411 }
2412
2413 static bool
2414 pager_enter(struct view *view, struct line *line)
2415 {
2416 int split = 0;
2417
2418 if (line->type == LINE_COMMIT &&
2419 (view == VIEW(REQ_VIEW_LOG) ||
2420 view == VIEW(REQ_VIEW_PAGER))) {
2421 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2422 split = 1;
2423 }
2424
2425 /* Always scroll the view even if it was split. That way
2426 * you can use Enter to scroll through the log view and
2427 * split open each commit diff. */
2428 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2429
2430 /* FIXME: A minor workaround. Scrolling the view will call report("")
2431 * but if we are scrolling a non-current view this won't properly
2432 * update the view title. */
2433 if (split)
2434 update_view_title(view);
2435
2436 return TRUE;
2437 }
2438
2439 static bool
2440 pager_grep(struct view *view, struct line *line)
2441 {
2442 regmatch_t pmatch;
2443 char *text = line->data;
2444
2445 if (!*text)
2446 return FALSE;
2447
2448 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2449 return FALSE;
2450
2451 return TRUE;
2452 }
2453
2454 static void
2455 pager_select(struct view *view, struct line *line)
2456 {
2457 if (line->type == LINE_COMMIT) {
2458 char *text = line->data;
2459
2460 string_copy(view->ref, text + STRING_SIZE("commit "));
2461 string_copy(ref_commit, view->ref);
2462 }
2463 }
2464
2465 static struct view_ops pager_ops = {
2466 "line",
2467 pager_draw,
2468 pager_read,
2469 pager_enter,
2470 pager_grep,
2471 pager_select,
2472 };
2473
2474
2475 /*
2476 * Tree backend
2477 */
2478
2479 /* Parse output from git-ls-tree(1):
2480 *
2481 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2482 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2483 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2484 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2485 */
2486
2487 #define SIZEOF_TREE_ATTR \
2488 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2489
2490 #define TREE_UP_FORMAT "040000 tree %s\t.."
2491
2492 static int
2493 tree_compare_entry(enum line_type type1, char *name1,
2494 enum line_type type2, char *name2)
2495 {
2496 if (type1 != type2) {
2497 if (type1 == LINE_TREE_DIR)
2498 return -1;
2499 return 1;
2500 }
2501
2502 return strcmp(name1, name2);
2503 }
2504
2505 static bool
2506 tree_read(struct view *view, char *text)
2507 {
2508 size_t textlen = text ? strlen(text) : 0;
2509 char buf[SIZEOF_STR];
2510 unsigned long pos;
2511 enum line_type type;
2512 bool first_read = view->lines == 0;
2513
2514 if (textlen <= SIZEOF_TREE_ATTR)
2515 return FALSE;
2516
2517 type = text[STRING_SIZE("100644 ")] == 't'
2518 ? LINE_TREE_DIR : LINE_TREE_FILE;
2519
2520 if (first_read) {
2521 /* Add path info line */
2522 if (string_format(buf, "Directory path /%s", opt_path) &&
2523 realloc_lines(view, view->line_size + 1) &&
2524 pager_read(view, buf))
2525 view->line[view->lines - 1].type = LINE_DEFAULT;
2526 else
2527 return FALSE;
2528
2529 /* Insert "link" to parent directory. */
2530 if (*opt_path &&
2531 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2532 realloc_lines(view, view->line_size + 1) &&
2533 pager_read(view, buf))
2534 view->line[view->lines - 1].type = LINE_TREE_DIR;
2535 else if (*opt_path)
2536 return FALSE;
2537 }
2538
2539 /* Strip the path part ... */
2540 if (*opt_path) {
2541 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2542 size_t striplen = strlen(opt_path);
2543 char *path = text + SIZEOF_TREE_ATTR;
2544
2545 if (pathlen > striplen)
2546 memmove(path, path + striplen,
2547 pathlen - striplen + 1);
2548 }
2549
2550 /* Skip "Directory ..." and ".." line. */
2551 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2552 struct line *line = &view->line[pos];
2553 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2554 char *path2 = text + SIZEOF_TREE_ATTR;
2555 int cmp = tree_compare_entry(line->type, path1, type, path2);
2556
2557 if (cmp <= 0)
2558 continue;
2559
2560 text = strdup(text);
2561 if (!text)
2562 return FALSE;
2563
2564 if (view->lines > pos)
2565 memmove(&view->line[pos + 1], &view->line[pos],
2566 (view->lines - pos) * sizeof(*line));
2567
2568 line = &view->line[pos];
2569 line->data = text;
2570 line->type = type;
2571 view->lines++;
2572 return TRUE;
2573 }
2574
2575 if (!pager_read(view, text))
2576 return FALSE;
2577
2578 /* Move the current line to the first tree entry. */
2579 if (first_read)
2580 view->lineno++;
2581
2582 view->line[view->lines - 1].type = type;
2583 return TRUE;
2584 }
2585
2586 static bool
2587 tree_enter(struct view *view, struct line *line)
2588 {
2589 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2590 enum request request;
2591
2592 switch (line->type) {
2593 case LINE_TREE_DIR:
2594 /* Depending on whether it is a subdir or parent (updir?) link
2595 * mangle the path buffer. */
2596 if (line == &view->line[1] && *opt_path) {
2597 size_t path_len = strlen(opt_path);
2598 char *dirsep = opt_path + path_len - 1;
2599
2600 while (dirsep > opt_path && dirsep[-1] != '/')
2601 dirsep--;
2602
2603 dirsep[0] = 0;
2604
2605 } else {
2606 size_t pathlen = strlen(opt_path);
2607 size_t origlen = pathlen;
2608 char *data = line->data;
2609 char *basename = data + SIZEOF_TREE_ATTR;
2610
2611 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2612 opt_path[origlen] = 0;
2613 return TRUE;
2614 }
2615 }
2616
2617 /* Trees and subtrees share the same ID, so they are not not
2618 * unique like blobs. */
2619 flags |= OPEN_RELOAD;
2620 request = REQ_VIEW_TREE;
2621 break;
2622
2623 case LINE_TREE_FILE:
2624 request = REQ_VIEW_BLOB;
2625 break;
2626
2627 default:
2628 return TRUE;
2629 }
2630
2631 open_view(view, request, flags);
2632
2633 return TRUE;
2634 }
2635
2636 static void
2637 tree_select(struct view *view, struct line *line)
2638 {
2639 char *text = line->data;
2640
2641 text += STRING_SIZE("100644 blob ");
2642
2643 if (line->type == LINE_TREE_FILE) {
2644 string_ncopy(ref_blob, text, 40);
2645 /* Also update the blob view's ref, since all there must always
2646 * be in sync. */
2647 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2648
2649 } else if (line->type != LINE_TREE_DIR) {
2650 return;
2651 }
2652
2653 string_ncopy(view->ref, text, 40);
2654 }
2655
2656 static struct view_ops tree_ops = {
2657 "file",
2658 pager_draw,
2659 tree_read,
2660 tree_enter,
2661 pager_grep,
2662 tree_select,
2663 };
2664
2665 static bool
2666 blob_read(struct view *view, char *line)
2667 {
2668 bool state = pager_read(view, line);
2669
2670 if (state == TRUE)
2671 view->line[view->lines - 1].type = LINE_DEFAULT;
2672
2673 return state;
2674 }
2675
2676 static struct view_ops blob_ops = {
2677 "line",
2678 pager_draw,
2679 blob_read,
2680 pager_enter,
2681 pager_grep,
2682 pager_select,
2683 };
2684
2685
2686 /*
2687 * Revision graph
2688 */
2689
2690 struct commit {
2691 char id[SIZEOF_REV]; /* SHA1 ID. */
2692 char title[75]; /* First line of the commit message. */
2693 char author[75]; /* Author of the commit. */
2694 struct tm time; /* Date from the author ident. */
2695 struct ref **refs; /* Repository references. */
2696 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2697 size_t graph_size; /* The width of the graph array. */
2698 };
2699
2700 /* Size of rev graph with no "padding" columns */
2701 #define SIZEOF_REVITEMS (SIZEOF_REVGRAPH - (SIZEOF_REVGRAPH / 2))
2702
2703 struct rev_graph {
2704 struct rev_graph *prev, *next, *parents;
2705 char rev[SIZEOF_REVITEMS][SIZEOF_REV];
2706 size_t size;
2707 struct commit *commit;
2708 size_t pos;
2709 };
2710
2711 /* Parents of the commit being visualized. */
2712 static struct rev_graph graph_parents[4];
2713
2714 /* The current stack of revisions on the graph. */
2715 static struct rev_graph graph_stacks[4] = {
2716 { &graph_stacks[3], &graph_stacks[1], &graph_parents[0] },
2717 { &graph_stacks[0], &graph_stacks[2], &graph_parents[1] },
2718 { &graph_stacks[1], &graph_stacks[3], &graph_parents[2] },
2719 { &graph_stacks[2], &graph_stacks[0], &graph_parents[3] },
2720 };
2721
2722 static inline bool
2723 graph_parent_is_merge(struct rev_graph *graph)
2724 {
2725 return graph->parents->size > 1;
2726 }
2727
2728 static inline void
2729 append_to_rev_graph(struct rev_graph *graph, chtype symbol)
2730 {
2731 struct commit *commit = graph->commit;
2732
2733 if (commit->graph_size < ARRAY_SIZE(commit->graph) - 1)
2734 commit->graph[commit->graph_size++] = symbol;
2735 }
2736
2737 static void
2738 done_rev_graph(struct rev_graph *graph)
2739 {
2740 if (graph_parent_is_merge(graph) &&
2741 graph->pos < graph->size - 1 &&
2742 graph->next->size == graph->size + graph->parents->size - 1) {
2743 size_t i = graph->pos + graph->parents->size - 1;
2744
2745 graph->commit->graph_size = i * 2;
2746 while (i < graph->next->size - 1) {
2747 append_to_rev_graph(graph, ' ');
2748 append_to_rev_graph(graph, '\\');
2749 i++;
2750 }
2751 }
2752
2753 graph->size = graph->pos = 0;
2754 graph->commit = NULL;
2755 memset(graph->parents, 0, sizeof(*graph->parents));
2756 }
2757
2758 static void
2759 push_rev_graph(struct rev_graph *graph, char *parent)
2760 {
2761 /* Combine duplicate parents lines. */
2762 if (graph->size > 0 &&
2763 !strncmp(graph->rev[graph->size - 1], parent, SIZEOF_REV))
2764 return;
2765
2766 if (graph->size < SIZEOF_REVITEMS) {
2767 string_ncopy(graph->rev[graph->size++], parent, SIZEOF_REV);
2768 }
2769 }
2770
2771 static chtype
2772 get_rev_graph_symbol(struct rev_graph *graph)
2773 {
2774 chtype symbol;
2775
2776 if (graph->parents->size == 0)
2777 symbol = REVGRAPH_INIT;
2778 else if (graph_parent_is_merge(graph))
2779 symbol = REVGRAPH_MERGE;
2780 else if (graph->pos >= graph->size)
2781 symbol = REVGRAPH_BRANCH;
2782 else
2783 symbol = REVGRAPH_COMMIT;
2784
2785 return symbol;
2786 }
2787
2788 static void
2789 draw_rev_graph(struct rev_graph *graph)
2790 {
2791 struct rev_filler {
2792 chtype separator, line;
2793 };
2794 enum { DEFAULT, RSHARP, RDIAG, LDIAG };
2795 static struct rev_filler fillers[] = {
2796 { ' ', REVGRAPH_LINE },
2797 { '`', '.' },
2798 { '\'', ' ' },
2799 { '/', ' ' },
2800 };
2801 chtype symbol = get_rev_graph_symbol(graph);
2802 struct rev_filler *filler;
2803 size_t i;
2804
2805 filler = &fillers[DEFAULT];
2806
2807 for (i = 0; i < graph->pos; i++) {
2808 append_to_rev_graph(graph, filler->line);
2809 if (graph_parent_is_merge(graph->prev) &&
2810 graph->prev->pos == i)
2811 filler = &fillers[RSHARP];
2812
2813 append_to_rev_graph(graph, filler->separator);
2814 }
2815
2816 /* Place the symbol for this revision. */
2817 append_to_rev_graph(graph, symbol);
2818
2819 if (graph->prev->size > graph->size)
2820 filler = &fillers[RDIAG];
2821 else
2822 filler = &fillers[DEFAULT];
2823
2824 i++;
2825
2826 for (; i < graph->size; i++) {
2827 append_to_rev_graph(graph, filler->separator);
2828 append_to_rev_graph(graph, filler->line);
2829 if (graph_parent_is_merge(graph->prev) &&
2830 i < graph->prev->pos + graph->parents->size)
2831 filler = &fillers[RSHARP];
2832 if (graph->prev->size > graph->size)
2833 filler = &fillers[LDIAG];
2834 }
2835
2836 if (graph->prev->size > graph->size) {
2837 append_to_rev_graph(graph, filler->separator);
2838 if (filler->line != ' ')
2839 append_to_rev_graph(graph, filler->line);
2840 }
2841 }
2842
2843 /* Prepare the next rev graph */
2844 static void
2845 prepare_rev_graph(struct rev_graph *graph)
2846 {
2847 size_t i;
2848
2849 /* First, traverse all lines of revisions up to the active one. */
2850 for (graph->pos = 0; graph->pos < graph->size; graph->pos++) {
2851 if (!strcmp(graph->rev[graph->pos], graph->commit->id))
2852 break;
2853
2854 push_rev_graph(graph->next, graph->rev[graph->pos]);
2855 }
2856
2857 /* Interleave the new revision parent(s). */
2858 for (i = 0; i < graph->parents->size; i++)
2859 push_rev_graph(graph->next, graph->parents->rev[i]);
2860
2861 /* Lastly, put any remaining revisions. */
2862 for (i = graph->pos + 1; i < graph->size; i++)
2863 push_rev_graph(graph->next, graph->rev[i]);
2864 }
2865
2866 static void
2867 update_rev_graph(struct rev_graph *graph)
2868 {
2869 /* If this is the finalizing update ... */
2870 if (graph->commit)
2871 prepare_rev_graph(graph);
2872
2873 /* Graph visualization needs a one rev look-ahead,
2874 * so the first update doesn't visualize anything. */
2875 if (!graph->prev->commit)
2876 return;
2877
2878 draw_rev_graph(graph->prev);
2879 done_rev_graph(graph->prev->prev);
2880 }
2881
2882
2883 /*
2884 * Main view backend
2885 */
2886
2887 static bool
2888 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2889 {
2890 char buf[DATE_COLS + 1];
2891 struct commit *commit = line->data;
2892 enum line_type type;
2893 int col = 0;
2894 size_t timelen;
2895 size_t authorlen;
2896 int trimmed = 1;
2897
2898 if (!*commit->author)
2899 return FALSE;
2900
2901 wmove(view->win, lineno, col);
2902
2903 if (selected) {
2904 type = LINE_CURSOR;
2905 wattrset(view->win, get_line_attr(type));
2906 wchgat(view->win, -1, 0, type, NULL);
2907
2908 } else {
2909 type = LINE_MAIN_COMMIT;
2910 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2911 }
2912
2913 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2914 waddnstr(view->win, buf, timelen);
2915 waddstr(view->win, " ");
2916
2917 col += DATE_COLS;
2918 wmove(view->win, lineno, col);
2919 if (type != LINE_CURSOR)
2920 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2921
2922 if (opt_utf8) {
2923 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2924 } else {
2925 authorlen = strlen(commit->author);
2926 if (authorlen > AUTHOR_COLS - 2) {
2927 authorlen = AUTHOR_COLS - 2;
2928 trimmed = 1;
2929 }
2930 }
2931
2932 if (trimmed) {
2933 waddnstr(view->win, commit->author, authorlen);
2934 if (type != LINE_CURSOR)
2935 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2936 waddch(view->win, '~');
2937 } else {
2938 waddstr(view->win, commit->author);
2939 }
2940
2941 col += AUTHOR_COLS;
2942 if (type != LINE_CURSOR)
2943 wattrset(view->win, A_NORMAL);
2944
2945 if (opt_rev_graph && commit->graph_size) {
2946 size_t i;
2947
2948 wmove(view->win, lineno, col);
2949 /* Using waddch() instead of waddnstr() ensures that
2950 * they'll be rendered correctly for the cursor line. */
2951 for (i = 0; i < commit->graph_size; i++)
2952 waddch(view->win, commit->graph[i]);
2953
2954 waddch(view->win, ' ');
2955 col += commit->graph_size + 1;
2956 }
2957
2958 wmove(view->win, lineno, col);
2959
2960 if (commit->refs) {
2961 size_t i = 0;
2962
2963 do {
2964 if (type == LINE_CURSOR)
2965 ;
2966 else if (commit->refs[i]->tag)
2967 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2968 else
2969 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2970 waddstr(view->win, "[");
2971 waddstr(view->win, commit->refs[i]->name);
2972 waddstr(view->win, "]");
2973 if (type != LINE_CURSOR)
2974 wattrset(view->win, A_NORMAL);
2975 waddstr(view->win, " ");
2976 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2977 } while (commit->refs[i++]->next);
2978 }
2979
2980 if (type != LINE_CURSOR)
2981 wattrset(view->win, get_line_attr(type));
2982
2983 {
2984 int titlelen = strlen(commit->title);
2985
2986 if (col + titlelen > view->width)
2987 titlelen = view->width - col;
2988
2989 waddnstr(view->win, commit->title, titlelen);
2990 }
2991
2992 return TRUE;
2993 }
2994
2995 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2996 static bool
2997 main_read(struct view *view, char *line)
2998 {
2999 static struct rev_graph *graph = graph_stacks;
3000 enum line_type type;
3001 struct commit *commit = view->lines
3002 ? view->line[view->lines - 1].data : NULL;
3003
3004 if (!line) {
3005 update_rev_graph(graph);
3006 return TRUE;
3007 }
3008
3009 type = get_line_type(line);
3010
3011 switch (type) {
3012 case LINE_COMMIT:
3013 commit = calloc(1, sizeof(struct commit));
3014 if (!commit)
3015 return FALSE;
3016
3017 line += STRING_SIZE("commit ");
3018
3019 view->line[view->lines++].data = commit;
3020 string_copy(commit->id, line);
3021 commit->refs = get_refs(commit->id);
3022 graph->commit = commit;
3023 break;
3024
3025 case LINE_PARENT:
3026 if (commit) {
3027 line += STRING_SIZE("parent ");
3028 push_rev_graph(graph->parents, line);
3029 }
3030 break;
3031
3032 case LINE_AUTHOR:
3033 {
3034 char *ident = line + STRING_SIZE("author ");
3035 char *end = strchr(ident, '<');
3036
3037 if (!commit)
3038 break;
3039
3040 update_rev_graph(graph);
3041 graph = graph->next;
3042
3043 if (end) {
3044 char *email = end + 1;
3045
3046 for (; end > ident && isspace(end[-1]); end--) ;
3047
3048 if (end == ident && *email) {
3049 ident = email;
3050 end = strchr(ident, '>');
3051 for (; end > ident && isspace(end[-1]); end--) ;
3052 }
3053 *end = 0;
3054 }
3055
3056 /* End is NULL or ident meaning there's no author. */
3057 if (end <= ident)
3058 ident = "Unknown";
3059
3060 string_copy(commit->author, ident);
3061
3062 /* Parse epoch and timezone */
3063 if (end) {
3064 char *secs = strchr(end + 1, '>');
3065 char *zone;
3066 time_t time;
3067
3068 if (!secs || secs[1] != ' ')
3069 break;
3070
3071 secs += 2;
3072 time = (time_t) atol(secs);
3073 zone = strchr(secs, ' ');
3074 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
3075 long tz;
3076
3077 zone++;
3078 tz = ('0' - zone[1]) * 60 * 60 * 10;
3079 tz += ('0' - zone[2]) * 60 * 60;
3080 tz += ('0' - zone[3]) * 60;
3081 tz += ('0' - zone[4]) * 60;
3082
3083 if (zone[0] == '-')
3084 tz = -tz;
3085
3086 time -= tz;
3087 }
3088 gmtime_r(&time, &commit->time);
3089 }
3090 break;
3091 }
3092 default:
3093 if (!commit)
3094 break;
3095
3096 /* Fill in the commit title if it has not already been set. */
3097 if (commit->title[0])
3098 break;
3099
3100 /* Require titles to start with a non-space character at the
3101 * offset used by git log. */
3102 /* FIXME: More gracefull handling of titles; append "..." to
3103 * shortened titles, etc. */
3104 if (strncmp(line, " ", 4) ||
3105 isspace(line[4]))
3106 break;
3107
3108 string_copy(commit->title, line + 4);
3109 }
3110
3111 return TRUE;
3112 }
3113
3114 static bool
3115 main_enter(struct view *view, struct line *line)
3116 {
3117 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
3118
3119 open_view(view, REQ_VIEW_DIFF, flags);
3120 return TRUE;
3121 }
3122
3123 static bool
3124 main_grep(struct view *view, struct line *line)
3125 {
3126 struct commit *commit = line->data;
3127 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
3128 char buf[DATE_COLS + 1];
3129 regmatch_t pmatch;
3130
3131 for (state = S_TITLE; state < S_END; state++) {
3132 char *text;
3133
3134 switch (state) {
3135 case S_TITLE: text = commit->title; break;
3136 case S_AUTHOR: text = commit->author; break;
3137 case S_DATE:
3138 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
3139 continue;
3140 text = buf;
3141 break;
3142
3143 default:
3144 return FALSE;
3145 }
3146
3147 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
3148 return TRUE;
3149 }
3150
3151 return FALSE;
3152 }
3153
3154 static void
3155 main_select(struct view *view, struct line *line)
3156 {
3157 struct commit *commit = line->data;
3158
3159 string_copy(view->ref, commit->id);
3160 string_copy(ref_commit, view->ref);
3161 }
3162
3163 static struct view_ops main_ops = {
3164 "commit",
3165 main_draw,
3166 main_read,
3167 main_enter,
3168 main_grep,
3169 main_select,
3170 };
3171
3172
3173 /*
3174 * Unicode / UTF-8 handling
3175 *
3176 * NOTE: Much of the following code for dealing with unicode is derived from
3177 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
3178 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
3179 */
3180
3181 /* I've (over)annotated a lot of code snippets because I am not entirely
3182 * confident that the approach taken by this small UTF-8 interface is correct.
3183 * --jonas */
3184
3185 static inline int
3186 unicode_width(unsigned long c)
3187 {
3188 if (c >= 0x1100 &&
3189 (c <= 0x115f /* Hangul Jamo */
3190 || c == 0x2329
3191 || c == 0x232a
3192 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
3193 /* CJK ... Yi */
3194 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
3195 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
3196 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
3197 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
3198 || (c >= 0xffe0 && c <= 0xffe6)
3199 || (c >= 0x20000 && c <= 0x2fffd)
3200 || (c >= 0x30000 && c <= 0x3fffd)))
3201 return 2;
3202
3203 return 1;
3204 }
3205
3206 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
3207 * Illegal bytes are set one. */
3208 static const unsigned char utf8_bytes[256] = {
3209 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,
3210 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,
3211 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,
3212 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,
3213 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,
3214 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,
3215 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,
3216 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,
3217 };
3218
3219 /* Decode UTF-8 multi-byte representation into a unicode character. */
3220 static inline unsigned long
3221 utf8_to_unicode(const char *string, size_t length)
3222 {
3223 unsigned long unicode;
3224
3225 switch (length) {
3226 case 1:
3227 unicode = string[0];
3228 break;
3229 case 2:
3230 unicode = (string[0] & 0x1f) << 6;
3231 unicode += (string[1] & 0x3f);
3232 break;
3233 case 3:
3234 unicode = (string[0] & 0x0f) << 12;
3235 unicode += ((string[1] & 0x3f) << 6);
3236 unicode += (string[2] & 0x3f);
3237 break;
3238 case 4:
3239 unicode = (string[0] & 0x0f) << 18;
3240 unicode += ((string[1] & 0x3f) << 12);
3241 unicode += ((string[2] & 0x3f) << 6);
3242 unicode += (string[3] & 0x3f);
3243 break;
3244 case 5:
3245 unicode = (string[0] & 0x0f) << 24;
3246 unicode += ((string[1] & 0x3f) << 18);
3247 unicode += ((string[2] & 0x3f) << 12);
3248 unicode += ((string[3] & 0x3f) << 6);
3249 unicode += (string[4] & 0x3f);
3250 break;
3251 case 6:
3252 unicode = (string[0] & 0x01) << 30;
3253 unicode += ((string[1] & 0x3f) << 24);
3254 unicode += ((string[2] & 0x3f) << 18);
3255 unicode += ((string[3] & 0x3f) << 12);
3256 unicode += ((string[4] & 0x3f) << 6);
3257 unicode += (string[5] & 0x3f);
3258 break;
3259 default:
3260 die("Invalid unicode length");
3261 }
3262
3263 /* Invalid characters could return the special 0xfffd value but NUL
3264 * should be just as good. */
3265 return unicode > 0xffff ? 0 : unicode;
3266 }
3267
3268 /* Calculates how much of string can be shown within the given maximum width
3269 * and sets trimmed parameter to non-zero value if all of string could not be
3270 * shown.
3271 *
3272 * Additionally, adds to coloffset how many many columns to move to align with
3273 * the expected position. Takes into account how multi-byte and double-width
3274 * characters will effect the cursor position.
3275 *
3276 * Returns the number of bytes to output from string to satisfy max_width. */
3277 static size_t
3278 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3279 {
3280 const char *start = string;
3281 const char *end = strchr(string, '\0');
3282 size_t mbwidth = 0;
3283 size_t width = 0;
3284
3285 *trimmed = 0;
3286
3287 while (string < end) {
3288 int c = *(unsigned char *) string;
3289 unsigned char bytes = utf8_bytes[c];
3290 size_t ucwidth;
3291 unsigned long unicode;
3292
3293 if (string + bytes > end)
3294 break;
3295
3296 /* Change representation to figure out whether
3297 * it is a single- or double-width character. */
3298
3299 unicode = utf8_to_unicode(string, bytes);
3300 /* FIXME: Graceful handling of invalid unicode character. */
3301 if (!unicode)
3302 break;
3303
3304 ucwidth = unicode_width(unicode);
3305 width += ucwidth;
3306 if (width > max_width) {
3307 *trimmed = 1;
3308 break;
3309 }
3310
3311 /* The column offset collects the differences between the
3312 * number of bytes encoding a character and the number of
3313 * columns will be used for rendering said character.
3314 *
3315 * So if some character A is encoded in 2 bytes, but will be
3316 * represented on the screen using only 1 byte this will and up
3317 * adding 1 to the multi-byte column offset.
3318 *
3319 * Assumes that no double-width character can be encoding in
3320 * less than two bytes. */
3321 if (bytes > ucwidth)
3322 mbwidth += bytes - ucwidth;
3323
3324 string += bytes;
3325 }
3326
3327 *coloffset += mbwidth;
3328
3329 return string - start;
3330 }
3331
3332
3333 /*
3334 * Status management
3335 */
3336
3337 /* Whether or not the curses interface has been initialized. */
3338 static bool cursed = FALSE;
3339
3340 /* The status window is used for polling keystrokes. */
3341 static WINDOW *status_win;
3342
3343 /* Update status and title window. */
3344 static void
3345 report(const char *msg, ...)
3346 {
3347 static bool empty = TRUE;
3348 struct view *view = display[current_view];
3349
3350 if (!empty || *msg) {
3351 va_list args;
3352
3353 va_start(args, msg);
3354
3355 werase(status_win);
3356 wmove(status_win, 0, 0);
3357 if (*msg) {
3358 vwprintw(status_win, msg, args);
3359 empty = FALSE;
3360 } else {
3361 empty = TRUE;
3362 }
3363 wrefresh(status_win);
3364
3365 va_end(args);
3366 }
3367
3368 update_view_title(view);
3369 update_display_cursor(view);
3370 }
3371
3372 /* Controls when nodelay should be in effect when polling user input. */
3373 static void
3374 set_nonblocking_input(bool loading)
3375 {
3376 static unsigned int loading_views;
3377
3378 if ((loading == FALSE && loading_views-- == 1) ||
3379 (loading == TRUE && loading_views++ == 0))
3380 nodelay(status_win, loading);
3381 }
3382
3383 static void
3384 init_display(void)
3385 {
3386 int x, y;
3387
3388 /* Initialize the curses library */
3389 if (isatty(STDIN_FILENO)) {
3390 cursed = !!initscr();
3391 } else {
3392 /* Leave stdin and stdout alone when acting as a pager. */
3393 FILE *io = fopen("/dev/tty", "r+");
3394
3395 if (!io)
3396 die("Failed to open /dev/tty");
3397 cursed = !!newterm(NULL, io, io);
3398 }
3399
3400 if (!cursed)
3401 die("Failed to initialize curses");
3402
3403 nonl(); /* Tell curses not to do NL->CR/NL on output */
3404 cbreak(); /* Take input chars one at a time, no wait for \n */
3405 noecho(); /* Don't echo input */
3406 leaveok(stdscr, TRUE);
3407
3408 if (has_colors())
3409 init_colors();
3410
3411 getmaxyx(stdscr, y, x);
3412 status_win = newwin(1, 0, y - 1, 0);
3413 if (!status_win)
3414 die("Failed to create status window");
3415
3416 /* Enable keyboard mapping */
3417 keypad(status_win, TRUE);
3418 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3419 }
3420
3421 static char *
3422 read_prompt(const char *prompt)
3423 {
3424 enum { READING, STOP, CANCEL } status = READING;
3425 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3426 int pos = 0;
3427
3428 while (status == READING) {
3429 struct view *view;
3430 int i, key;
3431
3432 foreach_view (view, i)
3433 update_view(view);
3434
3435 report("%s%.*s", prompt, pos, buf);
3436 /* Refresh, accept single keystroke of input */
3437 key = wgetch(status_win);
3438 switch (key) {
3439 case KEY_RETURN:
3440 case KEY_ENTER:
3441 case '\n':
3442 status = pos ? STOP : CANCEL;
3443 break;
3444
3445 case KEY_BACKSPACE:
3446 if (pos > 0)
3447 pos--;
3448 else
3449 status = CANCEL;
3450 break;
3451
3452 case KEY_ESC:
3453 status = CANCEL;
3454 break;
3455
3456 case ERR:
3457 break;
3458
3459 default:
3460 if (pos >= sizeof(buf)) {
3461 report("Input string too long");
3462 return NULL;
3463 }
3464
3465 if (isprint(key))
3466 buf[pos++] = (char) key;
3467 }
3468 }
3469
3470 if (status == CANCEL) {
3471 /* Clear the status window */
3472 report("");
3473 return NULL;
3474 }
3475
3476 buf[pos++] = 0;
3477
3478 return buf;
3479 }
3480
3481 /*
3482 * Repository references
3483 */
3484
3485 static struct ref *refs;
3486 static size_t refs_size;
3487
3488 /* Id <-> ref store */
3489 static struct ref ***id_refs;
3490 static size_t id_refs_size;
3491
3492 static struct ref **
3493 get_refs(char *id)
3494 {
3495 struct ref ***tmp_id_refs;
3496 struct ref **ref_list = NULL;
3497 size_t ref_list_size = 0;
3498 size_t i;
3499
3500 for (i = 0; i < id_refs_size; i++)
3501 if (!strcmp(id, id_refs[i][0]->id))
3502 return id_refs[i];
3503
3504 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3505 if (!tmp_id_refs)
3506 return NULL;
3507
3508 id_refs = tmp_id_refs;
3509
3510 for (i = 0; i < refs_size; i++) {
3511 struct ref **tmp;
3512
3513 if (strcmp(id, refs[i].id))
3514 continue;
3515
3516 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3517 if (!tmp) {
3518 if (ref_list)
3519 free(ref_list);
3520 return NULL;
3521 }
3522
3523 ref_list = tmp;
3524 if (ref_list_size > 0)
3525 ref_list[ref_list_size - 1]->next = 1;
3526 ref_list[ref_list_size] = &refs[i];
3527
3528 /* XXX: The properties of the commit chains ensures that we can
3529 * safely modify the shared ref. The repo references will
3530 * always be similar for the same id. */
3531 ref_list[ref_list_size]->next = 0;
3532 ref_list_size++;
3533 }
3534
3535 if (ref_list)
3536 id_refs[id_refs_size++] = ref_list;
3537
3538 return ref_list;
3539 }
3540
3541 static int
3542 read_ref(char *id, int idlen, char *name, int namelen)
3543 {
3544 struct ref *ref;
3545 bool tag = FALSE;
3546
3547 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3548 /* Commits referenced by tags has "^{}" appended. */
3549 if (name[namelen - 1] != '}')
3550 return OK;
3551
3552 while (namelen > 0 && name[namelen] != '^')
3553 namelen--;
3554
3555 tag = TRUE;
3556 namelen -= STRING_SIZE("refs/tags/");
3557 name += STRING_SIZE("refs/tags/");
3558
3559 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3560 namelen -= STRING_SIZE("refs/heads/");
3561 name += STRING_SIZE("refs/heads/");
3562
3563 } else if (!strcmp(name, "HEAD")) {
3564 return OK;
3565 }
3566
3567 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3568 if (!refs)
3569 return ERR;
3570
3571 ref = &refs[refs_size++];
3572 ref->name = malloc(namelen + 1);
3573 if (!ref->name)
3574 return ERR;
3575
3576 strncpy(ref->name, name, namelen);
3577 ref->name[namelen] = 0;
3578 ref->tag = tag;
3579 string_copy(ref->id, id);
3580
3581 return OK;
3582 }
3583
3584 static int
3585 load_refs(void)
3586 {
3587 const char *cmd_env = getenv("TIG_LS_REMOTE");
3588 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3589
3590 return read_properties(popen(cmd, "r"), "\t", read_ref);
3591 }
3592
3593 static int
3594 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3595 {
3596 if (!strcmp(name, "i18n.commitencoding"))
3597 string_copy(opt_encoding, value);
3598
3599 return OK;
3600 }
3601
3602 static int
3603 load_repo_config(void)
3604 {
3605 return read_properties(popen("git repo-config --list", "r"),
3606 "=", read_repo_config_option);
3607 }
3608
3609 static int
3610 read_properties(FILE *pipe, const char *separators,
3611 int (*read_property)(char *, int, char *, int))
3612 {
3613 char buffer[BUFSIZ];
3614 char *name;
3615 int state = OK;
3616
3617 if (!pipe)
3618 return ERR;
3619
3620 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3621 char *value;
3622 size_t namelen;
3623 size_t valuelen;
3624
3625 name = chomp_string(name);
3626 namelen = strcspn(name, separators);
3627
3628 if (name[namelen]) {
3629 name[namelen] = 0;
3630 value = chomp_string(name + namelen + 1);
3631 valuelen = strlen(value);
3632
3633 } else {
3634 value = "";
3635 valuelen = 0;
3636 }
3637
3638 state = read_property(name, namelen, value, valuelen);
3639 }
3640
3641 if (state != ERR && ferror(pipe))
3642 state = ERR;
3643
3644 pclose(pipe);
3645
3646 return state;
3647 }
3648
3649
3650 /*
3651 * Main
3652 */
3653
3654 static void __NORETURN
3655 quit(int sig)
3656 {
3657 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3658 if (cursed)
3659 endwin();
3660 exit(0);
3661 }
3662
3663 static void __NORETURN
3664 die(const char *err, ...)
3665 {
3666 va_list args;
3667
3668 endwin();
3669
3670 va_start(args, err);
3671 fputs("tig: ", stderr);
3672 vfprintf(stderr, err, args);
3673 fputs("\n", stderr);
3674 va_end(args);
3675
3676 exit(1);
3677 }
3678
3679 int
3680 main(int argc, char *argv[])
3681 {
3682 struct view *view;
3683 enum request request;
3684 size_t i;
3685
3686 signal(SIGINT, quit);
3687
3688 if (setlocale(LC_ALL, "")) {
3689 string_copy(opt_codeset, nl_langinfo(CODESET));
3690 }
3691
3692 if (load_options() == ERR)
3693 die("Failed to load user config.");
3694
3695 /* Load the repo config file so options can be overwritten from
3696 * the command line. */
3697 if (load_repo_config() == ERR)
3698 die("Failed to load repo config.");
3699
3700 if (!parse_options(argc, argv))
3701 return 0;
3702
3703 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3704 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3705 if (opt_iconv == ICONV_NONE)
3706 die("Failed to initialize character set conversion");
3707 }
3708
3709 if (load_refs() == ERR)
3710 die("Failed to load refs.");
3711
3712 /* Require a git repository unless when running in pager mode. */
3713 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3714 die("Not a git repository");
3715
3716 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3717 view->cmd_env = getenv(view->cmd_env);
3718
3719 request = opt_request;
3720
3721 init_display();
3722
3723 while (view_driver(display[current_view], request)) {
3724 int key;
3725 int i;
3726
3727 foreach_view (view, i)
3728 update_view(view);
3729
3730 /* Refresh, accept single keystroke of input */
3731 key = wgetch(status_win);
3732
3733 request = get_keybinding(display[current_view]->keymap, key);
3734
3735 /* Some low-level request handling. This keeps access to
3736 * status_win restricted. */
3737 switch (request) {
3738 case REQ_PROMPT:
3739 {
3740 char *cmd = read_prompt(":");
3741
3742 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3743 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3744 opt_request = REQ_VIEW_DIFF;
3745 } else {
3746 opt_request = REQ_VIEW_PAGER;
3747 }
3748 break;
3749 }
3750
3751 request = REQ_NONE;
3752 break;
3753 }
3754 case REQ_SEARCH:
3755 case REQ_SEARCH_BACK:
3756 {
3757 const char *prompt = request == REQ_SEARCH
3758 ? "/" : "?";
3759 char *search = read_prompt(prompt);
3760
3761 if (search)
3762 string_copy(opt_search, search);
3763 else
3764 request = REQ_NONE;
3765 break;
3766 }
3767 case REQ_SCREEN_RESIZE:
3768 {
3769 int height, width;
3770
3771 getmaxyx(stdscr, height, width);
3772
3773 /* Resize the status view and let the view driver take
3774 * care of resizing the displayed views. */
3775 wresize(status_win, 1, width);
3776 mvwin(status_win, height - 1, 0);
3777 wrefresh(status_win);
3778 break;
3779 }
3780 default:
3781 break;
3782 }
3783 }
3784
3785 quit(0);
3786
3787 return 0;
3788 }
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