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