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