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Rename load_help_page to open_help_view and move it up
[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-0.3"
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 <curses.h>
34
35 #if __GNUC__ >= 3
36 #define __NORETURN __attribute__((__noreturn__))
37 #else
38 #define __NORETURN
39 #endif
40
41 static void __NORETURN die(const char *err, ...);
42 static void report(const char *msg, ...);
43 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
44 static void set_nonblocking_input(bool loading);
45 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
46
47 #define ABS(x) ((x) >= 0 ? (x) : -(x))
48 #define MIN(x, y) ((x) < (y) ? (x) : (y))
49
50 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
51 #define STRING_SIZE(x) (sizeof(x) - 1)
52
53 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
54 #define SIZEOF_CMD 1024 /* Size of command buffer. */
55 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
56
57 /* This color name can be used to refer to the default term colors. */
58 #define COLOR_DEFAULT (-1)
59
60 /* The format and size of the date column in the main view. */
61 #define DATE_FORMAT "%Y-%m-%d %H:%M"
62 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
63
64 #define AUTHOR_COLS 20
65
66 /* The default interval between line numbers. */
67 #define NUMBER_INTERVAL 1
68
69 #define TABSIZE 8
70
71 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
72
73 #define TIG_LS_REMOTE \
74 "git ls-remote . 2>/dev/null"
75
76 #define TIG_DIFF_CMD \
77 "git show --patch-with-stat --find-copies-harder -B -C %s"
78
79 #define TIG_LOG_CMD \
80 "git log --cc --stat -n100 %s"
81
82 #define TIG_MAIN_CMD \
83 "git log --topo-order --stat --pretty=raw %s"
84
85 /* XXX: Needs to be defined to the empty string. */
86 #define TIG_HELP_CMD ""
87 #define TIG_PAGER_CMD ""
88
89 /* Some ascii-shorthands fitted into the ncurses namespace. */
90 #define KEY_TAB '\t'
91 #define KEY_RETURN '\r'
92 #define KEY_ESC 27
93
94
95 struct ref {
96 char *name; /* Ref name; tag or head names are shortened. */
97 char id[41]; /* Commit SHA1 ID */
98 unsigned int tag:1; /* Is it a tag? */
99 unsigned int next:1; /* For ref lists: are there more refs? */
100 };
101
102 static struct ref **get_refs(char *id);
103
104 struct int_map {
105 const char *name;
106 int namelen;
107 int value;
108 };
109
110 static int
111 set_from_int_map(struct int_map *map, size_t map_size,
112 int *value, const char *name, int namelen)
113 {
114
115 int i;
116
117 for (i = 0; i < map_size; i++)
118 if (namelen == map[i].namelen &&
119 !strncasecmp(name, map[i].name, namelen)) {
120 *value = map[i].value;
121 return OK;
122 }
123
124 return ERR;
125 }
126
127
128 /*
129 * String helpers
130 */
131
132 static inline void
133 string_ncopy(char *dst, const char *src, int dstlen)
134 {
135 strncpy(dst, src, dstlen - 1);
136 dst[dstlen - 1] = 0;
137
138 }
139
140 /* Shorthand for safely copying into a fixed buffer. */
141 #define string_copy(dst, src) \
142 string_ncopy(dst, src, sizeof(dst))
143
144 static char *
145 chomp_string(char *name)
146 {
147 int namelen;
148
149 while (isspace(*name))
150 name++;
151
152 namelen = strlen(name) - 1;
153 while (namelen > 0 && isspace(name[namelen]))
154 name[namelen--] = 0;
155
156 return name;
157 }
158
159 static bool
160 string_nformat(char *buf, size_t bufsize, int *bufpos, const char *fmt, ...)
161 {
162 va_list args;
163 int pos = bufpos ? *bufpos : 0;
164
165 va_start(args, fmt);
166 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
167 va_end(args);
168
169 if (bufpos)
170 *bufpos = pos;
171
172 return pos >= bufsize ? FALSE : TRUE;
173 }
174
175 #define string_format(buf, fmt, args...) \
176 string_nformat(buf, sizeof(buf), NULL, fmt, args)
177
178 #define string_format_from(buf, from, fmt, args...) \
179 string_nformat(buf, sizeof(buf), from, fmt, args)
180
181 /* Shell quoting
182 *
183 * NOTE: The following is a slightly modified copy of the git project's shell
184 * quoting routines found in the quote.c file.
185 *
186 * Help to copy the thing properly quoted for the shell safety. any single
187 * quote is replaced with '\'', any exclamation point is replaced with '\!',
188 * and the whole thing is enclosed in a
189 *
190 * E.g.
191 * original sq_quote result
192 * name ==> name ==> 'name'
193 * a b ==> a b ==> 'a b'
194 * a'b ==> a'\''b ==> 'a'\''b'
195 * a!b ==> a'\!'b ==> 'a'\!'b'
196 */
197
198 static size_t
199 sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src)
200 {
201 char c;
202
203 #define BUFPUT(x) do { if (bufsize < SIZEOF_CMD) buf[bufsize++] = (x); } while (0)
204
205 BUFPUT('\'');
206 while ((c = *src++)) {
207 if (c == '\'' || c == '!') {
208 BUFPUT('\'');
209 BUFPUT('\\');
210 BUFPUT(c);
211 BUFPUT('\'');
212 } else {
213 BUFPUT(c);
214 }
215 }
216 BUFPUT('\'');
217
218 return bufsize;
219 }
220
221
222 /*
223 * User requests
224 */
225
226 #define REQ_INFO \
227 /* XXX: Keep the view request first and in sync with views[]. */ \
228 REQ_GROUP("View switching") \
229 REQ_(VIEW_MAIN, "Show main view"), \
230 REQ_(VIEW_DIFF, "Show diff view"), \
231 REQ_(VIEW_LOG, "Show log view"), \
232 REQ_(VIEW_HELP, "Show help page"), \
233 REQ_(VIEW_PAGER, "Show pager view"), \
234 \
235 REQ_GROUP("View manipulation") \
236 REQ_(ENTER, "Enter current line and scroll"), \
237 REQ_(NEXT, "Move to next"), \
238 REQ_(PREVIOUS, "Move to previous"), \
239 REQ_(VIEW_NEXT, "Move focus to next view"), \
240 REQ_(VIEW_CLOSE, "Close the current view"), \
241 REQ_(QUIT, "Close all views and quit"), \
242 \
243 REQ_GROUP("Cursor navigation") \
244 REQ_(MOVE_UP, "Move cursor one line up"), \
245 REQ_(MOVE_DOWN, "Move cursor one line down"), \
246 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
247 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
248 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
249 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
250 \
251 REQ_GROUP("Scrolling") \
252 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
253 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
254 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
255 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
256 \
257 REQ_GROUP("Misc") \
258 REQ_(PROMPT, "Bring up the prompt"), \
259 REQ_(SCREEN_UPDATE, "Update the screen"), \
260 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
261 REQ_(SCREEN_RESIZE, "Resize the screen"), \
262 REQ_(SHOW_VERSION, "Show version information"), \
263 REQ_(STOP_LOADING, "Stop all loading views"), \
264 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
265 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization"),
266
267
268 /* User action requests. */
269 enum request {
270 #define REQ_GROUP(help)
271 #define REQ_(req, help) REQ_##req
272
273 /* Offset all requests to avoid conflicts with ncurses getch values. */
274 REQ_OFFSET = KEY_MAX + 1,
275 REQ_INFO
276
277 #undef REQ_GROUP
278 #undef REQ_
279 };
280
281 struct request_info {
282 enum request request;
283 char *help;
284 };
285
286 static struct request_info req_info[] = {
287 #define REQ_GROUP(help) { 0, (help) },
288 #define REQ_(req, help) { REQ_##req, (help) }
289 REQ_INFO
290 #undef REQ_GROUP
291 #undef REQ_
292 };
293
294 /*
295 * Options
296 */
297
298 static const char usage[] =
299 VERSION " (" __DATE__ ")\n"
300 "\n"
301 "Usage: tig [options]\n"
302 " or: tig [options] [--] [git log options]\n"
303 " or: tig [options] log [git log options]\n"
304 " or: tig [options] diff [git diff options]\n"
305 " or: tig [options] show [git show options]\n"
306 " or: tig [options] < [git command output]\n"
307 "\n"
308 "Options:\n"
309 " -l Start up in log view\n"
310 " -d Start up in diff view\n"
311 " -n[I], --line-number[=I] Show line numbers with given interval\n"
312 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
313 " -- Mark end of tig options\n"
314 " -v, --version Show version and exit\n"
315 " -h, --help Show help message and exit\n";
316
317 /* Option and state variables. */
318 static bool opt_line_number = FALSE;
319 static bool opt_rev_graph = TRUE;
320 static int opt_num_interval = NUMBER_INTERVAL;
321 static int opt_tab_size = TABSIZE;
322 static enum request opt_request = REQ_VIEW_MAIN;
323 static char opt_cmd[SIZEOF_CMD] = "";
324 static char opt_encoding[20] = "";
325 static bool opt_utf8 = TRUE;
326 static FILE *opt_pipe = NULL;
327
328 enum option_type {
329 OPT_NONE,
330 OPT_INT,
331 };
332
333 static bool
334 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
335 {
336 va_list args;
337 char *value = "";
338 int *number;
339
340 if (opt[0] != '-')
341 return FALSE;
342
343 if (opt[1] == '-') {
344 int namelen = strlen(name);
345
346 opt += 2;
347
348 if (strncmp(opt, name, namelen))
349 return FALSE;
350
351 if (opt[namelen] == '=')
352 value = opt + namelen + 1;
353
354 } else {
355 if (!short_name || opt[1] != short_name)
356 return FALSE;
357 value = opt + 2;
358 }
359
360 va_start(args, type);
361 if (type == OPT_INT) {
362 number = va_arg(args, int *);
363 if (isdigit(*value))
364 *number = atoi(value);
365 }
366 va_end(args);
367
368 return TRUE;
369 }
370
371 /* Returns the index of log or diff command or -1 to exit. */
372 static bool
373 parse_options(int argc, char *argv[])
374 {
375 int i;
376
377 for (i = 1; i < argc; i++) {
378 char *opt = argv[i];
379
380 if (!strcmp(opt, "-l")) {
381 opt_request = REQ_VIEW_LOG;
382 continue;
383 }
384
385 if (!strcmp(opt, "-d")) {
386 opt_request = REQ_VIEW_DIFF;
387 continue;
388 }
389
390 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
391 opt_line_number = TRUE;
392 continue;
393 }
394
395 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
396 opt_tab_size = MIN(opt_tab_size, TABSIZE);
397 continue;
398 }
399
400 if (check_option(opt, 'v', "version", OPT_NONE)) {
401 printf("tig version %s\n", VERSION);
402 return FALSE;
403 }
404
405 if (check_option(opt, 'h', "help", OPT_NONE)) {
406 printf(usage);
407 return FALSE;
408 }
409
410 if (!strcmp(opt, "--")) {
411 i++;
412 break;
413 }
414
415 if (!strcmp(opt, "log") ||
416 !strcmp(opt, "diff") ||
417 !strcmp(opt, "show")) {
418 opt_request = opt[0] == 'l'
419 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
420 break;
421 }
422
423 if (opt[0] && opt[0] != '-')
424 break;
425
426 die("unknown option '%s'\n\n%s", opt, usage);
427 }
428
429 if (!isatty(STDIN_FILENO)) {
430 opt_request = REQ_VIEW_PAGER;
431 opt_pipe = stdin;
432
433 } else if (i < argc) {
434 size_t buf_size;
435
436 if (opt_request == REQ_VIEW_MAIN)
437 /* XXX: This is vulnerable to the user overriding
438 * options required for the main view parser. */
439 string_copy(opt_cmd, "git log --stat --pretty=raw");
440 else
441 string_copy(opt_cmd, "git");
442 buf_size = strlen(opt_cmd);
443
444 while (buf_size < sizeof(opt_cmd) && i < argc) {
445 opt_cmd[buf_size++] = ' ';
446 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
447 }
448
449 if (buf_size >= sizeof(opt_cmd))
450 die("command too long");
451
452 opt_cmd[buf_size] = 0;
453
454 }
455
456 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
457 opt_utf8 = FALSE;
458
459 return TRUE;
460 }
461
462
463 /*
464 * Line-oriented content detection.
465 */
466
467 #define LINE_INFO \
468 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
469 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
470 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
471 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
472 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
473 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
474 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
475 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
476 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
477 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
478 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
479 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
480 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
481 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
482 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
483 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
484 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
485 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
486 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
487 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
488 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
489 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
490 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
491 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
492 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
493 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
494 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
495 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
496 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
497 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
498 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
499 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
500 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
501 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
502 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
503 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
504 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
505 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
506
507 enum line_type {
508 #define LINE(type, line, fg, bg, attr) \
509 LINE_##type
510 LINE_INFO
511 #undef LINE
512 };
513
514 struct line_info {
515 const char *name; /* Option name. */
516 int namelen; /* Size of option name. */
517 const char *line; /* The start of line to match. */
518 int linelen; /* Size of string to match. */
519 int fg, bg, attr; /* Color and text attributes for the lines. */
520 };
521
522 static struct line_info line_info[] = {
523 #define LINE(type, line, fg, bg, attr) \
524 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
525 LINE_INFO
526 #undef LINE
527 };
528
529 static enum line_type
530 get_line_type(char *line)
531 {
532 int linelen = strlen(line);
533 enum line_type type;
534
535 for (type = 0; type < ARRAY_SIZE(line_info); type++)
536 /* Case insensitive search matches Signed-off-by lines better. */
537 if (linelen >= line_info[type].linelen &&
538 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
539 return type;
540
541 return LINE_DEFAULT;
542 }
543
544 static inline int
545 get_line_attr(enum line_type type)
546 {
547 assert(type < ARRAY_SIZE(line_info));
548 return COLOR_PAIR(type) | line_info[type].attr;
549 }
550
551 static struct line_info *
552 get_line_info(char *name, int namelen)
553 {
554 enum line_type type;
555 int i;
556
557 /* Diff-Header -> DIFF_HEADER */
558 for (i = 0; i < namelen; i++) {
559 if (name[i] == '-')
560 name[i] = '_';
561 else if (name[i] == '.')
562 name[i] = '_';
563 }
564
565 for (type = 0; type < ARRAY_SIZE(line_info); type++)
566 if (namelen == line_info[type].namelen &&
567 !strncasecmp(line_info[type].name, name, namelen))
568 return &line_info[type];
569
570 return NULL;
571 }
572
573 static void
574 init_colors(void)
575 {
576 int default_bg = COLOR_BLACK;
577 int default_fg = COLOR_WHITE;
578 enum line_type type;
579
580 start_color();
581
582 if (use_default_colors() != ERR) {
583 default_bg = -1;
584 default_fg = -1;
585 }
586
587 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
588 struct line_info *info = &line_info[type];
589 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
590 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
591
592 init_pair(type, fg, bg);
593 }
594 }
595
596 struct line {
597 enum line_type type;
598 void *data; /* User data */
599 };
600
601
602 /*
603 * Keys
604 */
605
606 struct keymap {
607 int alias;
608 int request;
609 };
610
611 static struct keymap keymap[] = {
612 /* View switching */
613 { 'm', REQ_VIEW_MAIN },
614 { 'd', REQ_VIEW_DIFF },
615 { 'l', REQ_VIEW_LOG },
616 { 'p', REQ_VIEW_PAGER },
617 { 'h', REQ_VIEW_HELP },
618 { '?', REQ_VIEW_HELP },
619
620 /* View manipulation */
621 { 'q', REQ_VIEW_CLOSE },
622 { KEY_TAB, REQ_VIEW_NEXT },
623 { KEY_RETURN, REQ_ENTER },
624 { KEY_UP, REQ_PREVIOUS },
625 { KEY_DOWN, REQ_NEXT },
626
627 /* Cursor navigation */
628 { 'k', REQ_MOVE_UP },
629 { 'j', REQ_MOVE_DOWN },
630 { KEY_HOME, REQ_MOVE_FIRST_LINE },
631 { KEY_END, REQ_MOVE_LAST_LINE },
632 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
633 { ' ', REQ_MOVE_PAGE_DOWN },
634 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
635 { 'b', REQ_MOVE_PAGE_UP },
636 { '-', REQ_MOVE_PAGE_UP },
637
638 /* Scrolling */
639 { KEY_IC, REQ_SCROLL_LINE_UP },
640 { KEY_DC, REQ_SCROLL_LINE_DOWN },
641 { 'w', REQ_SCROLL_PAGE_UP },
642 { 's', REQ_SCROLL_PAGE_DOWN },
643
644 /* Misc */
645 { 'Q', REQ_QUIT },
646 { 'z', REQ_STOP_LOADING },
647 { 'v', REQ_SHOW_VERSION },
648 { 'r', REQ_SCREEN_REDRAW },
649 { 'n', REQ_TOGGLE_LINENO },
650 { 'g', REQ_TOGGLE_REV_GRAPH},
651 { ':', REQ_PROMPT },
652
653 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
654 { ERR, REQ_SCREEN_UPDATE },
655
656 /* Use the ncurses SIGWINCH handler. */
657 { KEY_RESIZE, REQ_SCREEN_RESIZE },
658 };
659
660 static enum request
661 get_request(int key)
662 {
663 int i;
664
665 for (i = 0; i < ARRAY_SIZE(keymap); i++)
666 if (keymap[i].alias == key)
667 return keymap[i].request;
668
669 return (enum request) key;
670 }
671
672 struct key {
673 char *name;
674 int value;
675 };
676
677 static struct key key_table[] = {
678 { "Enter", KEY_RETURN },
679 { "Space", ' ' },
680 { "Backspace", KEY_BACKSPACE },
681 { "Tab", KEY_TAB },
682 { "Escape", KEY_ESC },
683 { "Left", KEY_LEFT },
684 { "Right", KEY_RIGHT },
685 { "Up", KEY_UP },
686 { "Down", KEY_DOWN },
687 { "Insert", KEY_IC },
688 { "Delete", KEY_DC },
689 { "Home", KEY_HOME },
690 { "End", KEY_END },
691 { "PageUp", KEY_PPAGE },
692 { "PageDown", KEY_NPAGE },
693 { "F1", KEY_F(1) },
694 { "F2", KEY_F(2) },
695 { "F3", KEY_F(3) },
696 { "F4", KEY_F(4) },
697 { "F5", KEY_F(5) },
698 { "F6", KEY_F(6) },
699 { "F7", KEY_F(7) },
700 { "F8", KEY_F(8) },
701 { "F9", KEY_F(9) },
702 { "F10", KEY_F(10) },
703 { "F11", KEY_F(11) },
704 { "F12", KEY_F(12) },
705 };
706
707 static char *
708 get_key(enum request request)
709 {
710 static char buf[BUFSIZ];
711 static char key_char[] = "'X'";
712 int pos = 0;
713 char *sep = " ";
714 int i;
715
716 buf[pos] = 0;
717
718 for (i = 0; i < ARRAY_SIZE(keymap); i++) {
719 char *seq = NULL;
720 int key;
721
722 if (keymap[i].request != request)
723 continue;
724
725 for (key = 0; key < ARRAY_SIZE(key_table); key++)
726 if (key_table[key].value == keymap[i].alias)
727 seq = key_table[key].name;
728
729 if (seq == NULL &&
730 keymap[i].alias < 127 &&
731 isprint(keymap[i].alias)) {
732 key_char[1] = (char) keymap[i].alias;
733 seq = key_char;
734 }
735
736 if (!seq)
737 seq = "'?'";
738
739 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
740 return "Too many keybindings!";
741 sep = ", ";
742 }
743
744 return buf;
745 }
746
747
748 /*
749 * User config file handling.
750 */
751
752 static struct int_map color_map[] = {
753 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
754 COLOR_MAP(DEFAULT),
755 COLOR_MAP(BLACK),
756 COLOR_MAP(BLUE),
757 COLOR_MAP(CYAN),
758 COLOR_MAP(GREEN),
759 COLOR_MAP(MAGENTA),
760 COLOR_MAP(RED),
761 COLOR_MAP(WHITE),
762 COLOR_MAP(YELLOW),
763 };
764
765 #define set_color(color, name) \
766 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
767
768 static struct int_map attr_map[] = {
769 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
770 ATTR_MAP(NORMAL),
771 ATTR_MAP(BLINK),
772 ATTR_MAP(BOLD),
773 ATTR_MAP(DIM),
774 ATTR_MAP(REVERSE),
775 ATTR_MAP(STANDOUT),
776 ATTR_MAP(UNDERLINE),
777 };
778
779 #define set_attribute(attr, name) \
780 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
781
782 static int config_lineno;
783 static bool config_errors;
784 static char *config_msg;
785
786 /* Wants: object fgcolor bgcolor [attr] */
787 static int
788 option_color_command(int argc, char *argv[])
789 {
790 struct line_info *info;
791
792 if (argc != 3 && argc != 4) {
793 config_msg = "Wrong number of arguments given to color command";
794 return ERR;
795 }
796
797 info = get_line_info(argv[0], strlen(argv[0]));
798 if (!info) {
799 config_msg = "Unknown color name";
800 return ERR;
801 }
802
803 if (set_color(&info->fg, argv[1]) == ERR) {
804 config_msg = "Unknown color";
805 return ERR;
806 }
807
808 if (set_color(&info->bg, argv[2]) == ERR) {
809 config_msg = "Unknown color";
810 return ERR;
811 }
812
813 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
814 config_msg = "Unknown attribute";
815 return ERR;
816 }
817
818 return OK;
819 }
820
821 /* Wants: name = value */
822 static int
823 option_set_command(int argc, char *argv[])
824 {
825 if (argc != 3) {
826 config_msg = "Wrong number of arguments given to set command";
827 return ERR;
828 }
829
830 if (strcmp(argv[1], "=")) {
831 config_msg = "No value assigned";
832 return ERR;
833 }
834
835 if (!strcmp(argv[0], "show-rev-graph")) {
836 opt_rev_graph = (!strcmp(argv[2], "1") ||
837 !strcmp(argv[2], "true") ||
838 !strcmp(argv[2], "yes"));
839 return OK;
840 }
841
842 if (!strcmp(argv[0], "line-number-interval")) {
843 opt_num_interval = atoi(argv[2]);
844 return OK;
845 }
846
847 if (!strcmp(argv[0], "tab-size")) {
848 opt_tab_size = atoi(argv[2]);
849 return OK;
850 }
851
852 if (!strcmp(argv[0], "encoding")) {
853 string_copy(opt_encoding, argv[2]);
854 return OK;
855 }
856
857 return ERR;
858 }
859
860 static int
861 set_option(char *opt, char *value)
862 {
863 char *argv[16];
864 int valuelen;
865 int argc = 0;
866
867 /* Tokenize */
868 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
869 argv[argc++] = value;
870
871 value += valuelen;
872 if (!*value)
873 break;
874
875 *value++ = 0;
876 while (isspace(*value))
877 value++;
878 }
879
880 if (!strcmp(opt, "color"))
881 return option_color_command(argc, argv);
882
883 if (!strcmp(opt, "set"))
884 return option_set_command(argc, argv);
885
886 return ERR;
887 }
888
889 static int
890 read_option(char *opt, int optlen, char *value, int valuelen)
891 {
892 config_lineno++;
893 config_msg = "Internal error";
894
895 optlen = strcspn(opt, "#;");
896 if (optlen == 0) {
897 /* The whole line is a commend or empty. */
898 return OK;
899
900 } else if (opt[optlen] != 0) {
901 /* Part of the option name is a comment, so the value part
902 * should be ignored. */
903 valuelen = 0;
904 opt[optlen] = value[valuelen] = 0;
905 } else {
906 /* Else look for comment endings in the value. */
907 valuelen = strcspn(value, "#;");
908 value[valuelen] = 0;
909 }
910
911 if (set_option(opt, value) == ERR) {
912 fprintf(stderr, "Error on line %d, near '%.*s' option: %s\n",
913 config_lineno, optlen, opt, config_msg);
914 config_errors = TRUE;
915 }
916
917 /* Always keep going if errors are encountered. */
918 return OK;
919 }
920
921 static int
922 load_options(void)
923 {
924 char *home = getenv("HOME");
925 char buf[1024];
926 FILE *file;
927
928 config_lineno = 0;
929 config_errors = FALSE;
930
931 if (!home || !string_format(buf, "%s/.tigrc", home))
932 return ERR;
933
934 /* It's ok that the file doesn't exist. */
935 file = fopen(buf, "r");
936 if (!file)
937 return OK;
938
939 if (read_properties(file, " \t", read_option) == ERR ||
940 config_errors == TRUE)
941 fprintf(stderr, "Errors while loading %s.\n", buf);
942
943 return OK;
944 }
945
946
947 /*
948 * The viewer
949 */
950
951 struct view;
952 struct view_ops;
953
954 /* The display array of active views and the index of the current view. */
955 static struct view *display[2];
956 static unsigned int current_view;
957
958 #define foreach_view(view, i) \
959 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
960
961 #define displayed_views() (display[1] != NULL ? 2 : 1)
962
963 /* Current head and commit ID */
964 static char ref_commit[SIZEOF_REF] = "HEAD";
965 static char ref_head[SIZEOF_REF] = "HEAD";
966
967 struct view {
968 const char *name; /* View name */
969 const char *cmd_fmt; /* Default command line format */
970 const char *cmd_env; /* Command line set via environment */
971 const char *id; /* Points to either of ref_{head,commit} */
972
973 struct view_ops *ops; /* View operations */
974
975 char cmd[SIZEOF_CMD]; /* Command buffer */
976 char ref[SIZEOF_REF]; /* Hovered commit reference */
977 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
978
979 int height, width; /* The width and height of the main window */
980 WINDOW *win; /* The main window */
981 WINDOW *title; /* The title window living below the main window */
982
983 /* Navigation */
984 unsigned long offset; /* Offset of the window top */
985 unsigned long lineno; /* Current line number */
986
987 /* If non-NULL, points to the view that opened this view. If this view
988 * is closed tig will switch back to the parent view. */
989 struct view *parent;
990
991 /* Buffering */
992 unsigned long lines; /* Total number of lines */
993 struct line *line; /* Line index */
994 unsigned long line_size;/* Total number of allocated lines */
995 unsigned int digits; /* Number of digits in the lines member. */
996
997 /* Loading */
998 FILE *pipe;
999 time_t start_time;
1000 };
1001
1002 struct view_ops {
1003 /* What type of content being displayed. Used in the title bar. */
1004 const char *type;
1005 /* Draw one line; @lineno must be < view->height. */
1006 bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1007 /* Read one line; updates view->line. */
1008 bool (*read)(struct view *view, char *data);
1009 /* Depending on view, change display based on current line. */
1010 bool (*enter)(struct view *view, struct line *line);
1011 };
1012
1013 static struct view_ops pager_ops;
1014 static struct view_ops main_ops;
1015
1016 #define VIEW_STR(name, cmd, env, ref, ops) \
1017 { name, cmd, #env, ref, ops }
1018
1019 #define VIEW_(id, name, ops, ref) \
1020 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops)
1021
1022
1023 static struct view views[] = {
1024 VIEW_(MAIN, "main", &main_ops, ref_head),
1025 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1026 VIEW_(LOG, "log", &pager_ops, ref_head),
1027 VIEW_(HELP, "help", &pager_ops, "static"),
1028 VIEW_(PAGER, "pager", &pager_ops, "static"),
1029 };
1030
1031 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1032
1033
1034 static bool
1035 draw_view_line(struct view *view, unsigned int lineno)
1036 {
1037 if (view->offset + lineno >= view->lines)
1038 return FALSE;
1039
1040 return view->ops->draw(view, &view->line[view->offset + lineno], lineno);
1041 }
1042
1043 static void
1044 redraw_view_from(struct view *view, int lineno)
1045 {
1046 assert(0 <= lineno && lineno < view->height);
1047
1048 for (; lineno < view->height; lineno++) {
1049 if (!draw_view_line(view, lineno))
1050 break;
1051 }
1052
1053 redrawwin(view->win);
1054 wrefresh(view->win);
1055 }
1056
1057 static void
1058 redraw_view(struct view *view)
1059 {
1060 wclear(view->win);
1061 redraw_view_from(view, 0);
1062 }
1063
1064
1065 static void
1066 update_view_title(struct view *view)
1067 {
1068 if (view == display[current_view])
1069 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1070 else
1071 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1072
1073 werase(view->title);
1074 wmove(view->title, 0, 0);
1075
1076 if (*view->ref)
1077 wprintw(view->title, "[%s] %s", view->name, view->ref);
1078 else
1079 wprintw(view->title, "[%s]", view->name);
1080
1081 if (view->lines || view->pipe) {
1082 unsigned int view_lines = view->offset + view->height;
1083 unsigned int lines = view->lines
1084 ? MIN(view_lines, view->lines) * 100 / view->lines
1085 : 0;
1086
1087 wprintw(view->title, " - %s %d of %d (%d%%)",
1088 view->ops->type,
1089 view->lineno + 1,
1090 view->lines,
1091 lines);
1092 }
1093
1094 if (view->pipe) {
1095 time_t secs = time(NULL) - view->start_time;
1096
1097 /* Three git seconds are a long time ... */
1098 if (secs > 2)
1099 wprintw(view->title, " %lds", secs);
1100 }
1101
1102 wmove(view->title, 0, view->width - 1);
1103 wrefresh(view->title);
1104 }
1105
1106 static void
1107 resize_display(void)
1108 {
1109 int offset, i;
1110 struct view *base = display[0];
1111 struct view *view = display[1] ? display[1] : display[0];
1112
1113 /* Setup window dimensions */
1114
1115 getmaxyx(stdscr, base->height, base->width);
1116
1117 /* Make room for the status window. */
1118 base->height -= 1;
1119
1120 if (view != base) {
1121 /* Horizontal split. */
1122 view->width = base->width;
1123 view->height = SCALE_SPLIT_VIEW(base->height);
1124 base->height -= view->height;
1125
1126 /* Make room for the title bar. */
1127 view->height -= 1;
1128 }
1129
1130 /* Make room for the title bar. */
1131 base->height -= 1;
1132
1133 offset = 0;
1134
1135 foreach_view (view, i) {
1136 if (!view->win) {
1137 view->win = newwin(view->height, 0, offset, 0);
1138 if (!view->win)
1139 die("Failed to create %s view", view->name);
1140
1141 scrollok(view->win, TRUE);
1142
1143 view->title = newwin(1, 0, offset + view->height, 0);
1144 if (!view->title)
1145 die("Failed to create title window");
1146
1147 } else {
1148 wresize(view->win, view->height, view->width);
1149 mvwin(view->win, offset, 0);
1150 mvwin(view->title, offset + view->height, 0);
1151 }
1152
1153 offset += view->height + 1;
1154 }
1155 }
1156
1157 static void
1158 redraw_display(void)
1159 {
1160 struct view *view;
1161 int i;
1162
1163 foreach_view (view, i) {
1164 redraw_view(view);
1165 update_view_title(view);
1166 }
1167 }
1168
1169 static void
1170 update_display_cursor(void)
1171 {
1172 struct view *view = display[current_view];
1173
1174 /* Move the cursor to the right-most column of the cursor line.
1175 *
1176 * XXX: This could turn out to be a bit expensive, but it ensures that
1177 * the cursor does not jump around. */
1178 if (view->lines) {
1179 wmove(view->win, view->lineno - view->offset, view->width - 1);
1180 wrefresh(view->win);
1181 }
1182 }
1183
1184 /*
1185 * Navigation
1186 */
1187
1188 /* Scrolling backend */
1189 static void
1190 do_scroll_view(struct view *view, int lines, bool redraw)
1191 {
1192 /* The rendering expects the new offset. */
1193 view->offset += lines;
1194
1195 assert(0 <= view->offset && view->offset < view->lines);
1196 assert(lines);
1197
1198 /* Redraw the whole screen if scrolling is pointless. */
1199 if (view->height < ABS(lines)) {
1200 redraw_view(view);
1201
1202 } else {
1203 int line = lines > 0 ? view->height - lines : 0;
1204 int end = line + ABS(lines);
1205
1206 wscrl(view->win, lines);
1207
1208 for (; line < end; line++) {
1209 if (!draw_view_line(view, line))
1210 break;
1211 }
1212 }
1213
1214 /* Move current line into the view. */
1215 if (view->lineno < view->offset) {
1216 view->lineno = view->offset;
1217 draw_view_line(view, 0);
1218
1219 } else if (view->lineno >= view->offset + view->height) {
1220 if (view->lineno == view->offset + view->height) {
1221 /* Clear the hidden line so it doesn't show if the view
1222 * is scrolled up. */
1223 wmove(view->win, view->height, 0);
1224 wclrtoeol(view->win);
1225 }
1226 view->lineno = view->offset + view->height - 1;
1227 draw_view_line(view, view->lineno - view->offset);
1228 }
1229
1230 assert(view->offset <= view->lineno && view->lineno < view->lines);
1231
1232 if (!redraw)
1233 return;
1234
1235 redrawwin(view->win);
1236 wrefresh(view->win);
1237 report("");
1238 }
1239
1240 /* Scroll frontend */
1241 static void
1242 scroll_view(struct view *view, enum request request)
1243 {
1244 int lines = 1;
1245
1246 switch (request) {
1247 case REQ_SCROLL_PAGE_DOWN:
1248 lines = view->height;
1249 case REQ_SCROLL_LINE_DOWN:
1250 if (view->offset + lines > view->lines)
1251 lines = view->lines - view->offset;
1252
1253 if (lines == 0 || view->offset + view->height >= view->lines) {
1254 report("Cannot scroll beyond the last line");
1255 return;
1256 }
1257 break;
1258
1259 case REQ_SCROLL_PAGE_UP:
1260 lines = view->height;
1261 case REQ_SCROLL_LINE_UP:
1262 if (lines > view->offset)
1263 lines = view->offset;
1264
1265 if (lines == 0) {
1266 report("Cannot scroll beyond the first line");
1267 return;
1268 }
1269
1270 lines = -lines;
1271 break;
1272
1273 default:
1274 die("request %d not handled in switch", request);
1275 }
1276
1277 do_scroll_view(view, lines, TRUE);
1278 }
1279
1280 /* Cursor moving */
1281 static void
1282 move_view(struct view *view, enum request request, bool redraw)
1283 {
1284 int steps;
1285
1286 switch (request) {
1287 case REQ_MOVE_FIRST_LINE:
1288 steps = -view->lineno;
1289 break;
1290
1291 case REQ_MOVE_LAST_LINE:
1292 steps = view->lines - view->lineno - 1;
1293 break;
1294
1295 case REQ_MOVE_PAGE_UP:
1296 steps = view->height > view->lineno
1297 ? -view->lineno : -view->height;
1298 break;
1299
1300 case REQ_MOVE_PAGE_DOWN:
1301 steps = view->lineno + view->height >= view->lines
1302 ? view->lines - view->lineno - 1 : view->height;
1303 break;
1304
1305 case REQ_MOVE_UP:
1306 steps = -1;
1307 break;
1308
1309 case REQ_MOVE_DOWN:
1310 steps = 1;
1311 break;
1312
1313 default:
1314 die("request %d not handled in switch", request);
1315 }
1316
1317 if (steps <= 0 && view->lineno == 0) {
1318 report("Cannot move beyond the first line");
1319 return;
1320
1321 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1322 report("Cannot move beyond the last line");
1323 return;
1324 }
1325
1326 /* Move the current line */
1327 view->lineno += steps;
1328 assert(0 <= view->lineno && view->lineno < view->lines);
1329
1330 /* Repaint the old "current" line if we be scrolling */
1331 if (ABS(steps) < view->height) {
1332 int prev_lineno = view->lineno - steps - view->offset;
1333
1334 wmove(view->win, prev_lineno, 0);
1335 wclrtoeol(view->win);
1336 draw_view_line(view, prev_lineno);
1337 }
1338
1339 /* Check whether the view needs to be scrolled */
1340 if (view->lineno < view->offset ||
1341 view->lineno >= view->offset + view->height) {
1342 if (steps < 0 && -steps > view->offset) {
1343 steps = -view->offset;
1344
1345 } else if (steps > 0) {
1346 if (view->lineno == view->lines - 1 &&
1347 view->lines > view->height) {
1348 steps = view->lines - view->offset - 1;
1349 if (steps >= view->height)
1350 steps -= view->height - 1;
1351 }
1352 }
1353
1354 do_scroll_view(view, steps, redraw);
1355 return;
1356 }
1357
1358 /* Draw the current line */
1359 draw_view_line(view, view->lineno - view->offset);
1360
1361 if (!redraw)
1362 return;
1363
1364 redrawwin(view->win);
1365 wrefresh(view->win);
1366 report("");
1367 }
1368
1369
1370 /*
1371 * Incremental updating
1372 */
1373
1374 static void
1375 end_update(struct view *view)
1376 {
1377 if (!view->pipe)
1378 return;
1379 set_nonblocking_input(FALSE);
1380 if (view->pipe == stdin)
1381 fclose(view->pipe);
1382 else
1383 pclose(view->pipe);
1384 view->pipe = NULL;
1385 }
1386
1387 static bool
1388 begin_update(struct view *view)
1389 {
1390 const char *id = view->id;
1391
1392 if (view->pipe)
1393 end_update(view);
1394
1395 if (opt_cmd[0]) {
1396 string_copy(view->cmd, opt_cmd);
1397 opt_cmd[0] = 0;
1398 /* When running random commands, the view ref could have become
1399 * invalid so clear it. */
1400 view->ref[0] = 0;
1401 } else {
1402 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1403
1404 if (!string_format(view->cmd, format, id, id, id, id, id))
1405 return FALSE;
1406 }
1407
1408 /* Special case for the pager view. */
1409 if (opt_pipe) {
1410 view->pipe = opt_pipe;
1411 opt_pipe = NULL;
1412 } else {
1413 view->pipe = popen(view->cmd, "r");
1414 }
1415
1416 if (!view->pipe)
1417 return FALSE;
1418
1419 set_nonblocking_input(TRUE);
1420
1421 view->offset = 0;
1422 view->lines = 0;
1423 view->lineno = 0;
1424 string_copy(view->vid, id);
1425
1426 if (view->line) {
1427 int i;
1428
1429 for (i = 0; i < view->lines; i++)
1430 if (view->line[i].data)
1431 free(view->line[i].data);
1432
1433 free(view->line);
1434 view->line = NULL;
1435 }
1436
1437 view->start_time = time(NULL);
1438
1439 return TRUE;
1440 }
1441
1442 static struct line *
1443 realloc_lines(struct view *view, size_t line_size)
1444 {
1445 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1446
1447 if (!tmp)
1448 return NULL;
1449
1450 view->line = tmp;
1451 view->line_size = line_size;
1452 return view->line;
1453 }
1454
1455 static bool
1456 update_view(struct view *view)
1457 {
1458 char buffer[BUFSIZ];
1459 char *line;
1460 /* The number of lines to read. If too low it will cause too much
1461 * redrawing (and possible flickering), if too high responsiveness
1462 * will suffer. */
1463 unsigned long lines = view->height;
1464 int redraw_from = -1;
1465
1466 if (!view->pipe)
1467 return TRUE;
1468
1469 /* Only redraw if lines are visible. */
1470 if (view->offset + view->height >= view->lines)
1471 redraw_from = view->lines - view->offset;
1472
1473 if (!realloc_lines(view, view->lines + lines))
1474 goto alloc_error;
1475
1476 while ((line = fgets(buffer, sizeof(buffer), view->pipe))) {
1477 int linelen = strlen(line);
1478
1479 if (linelen)
1480 line[linelen - 1] = 0;
1481
1482 if (!view->ops->read(view, line))
1483 goto alloc_error;
1484
1485 if (lines-- == 1)
1486 break;
1487 }
1488
1489 {
1490 int digits;
1491
1492 lines = view->lines;
1493 for (digits = 0; lines; digits++)
1494 lines /= 10;
1495
1496 /* Keep the displayed view in sync with line number scaling. */
1497 if (digits != view->digits) {
1498 view->digits = digits;
1499 redraw_from = 0;
1500 }
1501 }
1502
1503 if (redraw_from >= 0) {
1504 /* If this is an incremental update, redraw the previous line
1505 * since for commits some members could have changed when
1506 * loading the main view. */
1507 if (redraw_from > 0)
1508 redraw_from--;
1509
1510 /* Incrementally draw avoids flickering. */
1511 redraw_view_from(view, redraw_from);
1512 }
1513
1514 /* Update the title _after_ the redraw so that if the redraw picks up a
1515 * commit reference in view->ref it'll be available here. */
1516 update_view_title(view);
1517
1518 if (ferror(view->pipe)) {
1519 report("Failed to read: %s", strerror(errno));
1520 goto end;
1521
1522 } else if (feof(view->pipe)) {
1523 report("");
1524 goto end;
1525 }
1526
1527 return TRUE;
1528
1529 alloc_error:
1530 report("Allocation failure");
1531
1532 end:
1533 end_update(view);
1534 return FALSE;
1535 }
1536
1537
1538 static void open_help_view(struct view *view)
1539 {
1540 char buf[BUFSIZ];
1541 int lines = ARRAY_SIZE(req_info) + 2;
1542 int i;
1543
1544 if (view->lines > 0)
1545 return;
1546
1547 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1548 if (!req_info[i].request)
1549 lines++;
1550
1551 view->line = calloc(lines, sizeof(*view->line));
1552 if (!view->line) {
1553 report("Allocation failure");
1554 return;
1555 }
1556
1557 view->ops->read(view, "Quick reference for tig keybindings:");
1558
1559 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1560 char *key;
1561
1562 if (!req_info[i].request) {
1563 view->ops->read(view, "");
1564 view->ops->read(view, req_info[i].help);
1565 continue;
1566 }
1567
1568 key = get_key(req_info[i].request);
1569 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1570 continue;
1571
1572 view->ops->read(view, buf);
1573 }
1574 }
1575
1576
1577 enum open_flags {
1578 OPEN_DEFAULT = 0, /* Use default view switching. */
1579 OPEN_SPLIT = 1, /* Split current view. */
1580 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1581 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1582 };
1583
1584 static void
1585 open_view(struct view *prev, enum request request, enum open_flags flags)
1586 {
1587 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1588 bool split = !!(flags & OPEN_SPLIT);
1589 bool reload = !!(flags & OPEN_RELOAD);
1590 struct view *view = VIEW(request);
1591 int nviews = displayed_views();
1592 struct view *base_view = display[0];
1593
1594 if (view == prev && nviews == 1 && !reload) {
1595 report("Already in %s view", view->name);
1596 return;
1597 }
1598
1599 if (view == VIEW(REQ_VIEW_HELP)) {
1600 open_help_view(view);
1601
1602 } else if ((reload || strcmp(view->vid, view->id)) &&
1603 !begin_update(view)) {
1604 report("Failed to load %s view", view->name);
1605 return;
1606 }
1607
1608 if (split) {
1609 display[1] = view;
1610 if (!backgrounded)
1611 current_view = 1;
1612 } else {
1613 /* Maximize the current view. */
1614 memset(display, 0, sizeof(display));
1615 current_view = 0;
1616 display[current_view] = view;
1617 }
1618
1619 /* Resize the view when switching between split- and full-screen,
1620 * or when switching between two different full-screen views. */
1621 if (nviews != displayed_views() ||
1622 (nviews == 1 && base_view != display[0]))
1623 resize_display();
1624
1625 if (split && prev->lineno - prev->offset >= prev->height) {
1626 /* Take the title line into account. */
1627 int lines = prev->lineno - prev->offset - prev->height + 1;
1628
1629 /* Scroll the view that was split if the current line is
1630 * outside the new limited view. */
1631 do_scroll_view(prev, lines, TRUE);
1632 }
1633
1634 if (prev && view != prev) {
1635 if (split && !backgrounded) {
1636 /* "Blur" the previous view. */
1637 update_view_title(prev);
1638 }
1639
1640 view->parent = prev;
1641 }
1642
1643 if (view->pipe && view->lines == 0) {
1644 /* Clear the old view and let the incremental updating refill
1645 * the screen. */
1646 wclear(view->win);
1647 report("");
1648 } else {
1649 redraw_view(view);
1650 report("");
1651 }
1652
1653 /* If the view is backgrounded the above calls to report()
1654 * won't redraw the view title. */
1655 if (backgrounded)
1656 update_view_title(view);
1657 }
1658
1659
1660 /*
1661 * User request switch noodle
1662 */
1663
1664 static int
1665 view_driver(struct view *view, enum request request)
1666 {
1667 int i;
1668
1669 switch (request) {
1670 case REQ_MOVE_UP:
1671 case REQ_MOVE_DOWN:
1672 case REQ_MOVE_PAGE_UP:
1673 case REQ_MOVE_PAGE_DOWN:
1674 case REQ_MOVE_FIRST_LINE:
1675 case REQ_MOVE_LAST_LINE:
1676 move_view(view, request, TRUE);
1677 break;
1678
1679 case REQ_SCROLL_LINE_DOWN:
1680 case REQ_SCROLL_LINE_UP:
1681 case REQ_SCROLL_PAGE_DOWN:
1682 case REQ_SCROLL_PAGE_UP:
1683 scroll_view(view, request);
1684 break;
1685
1686 case REQ_VIEW_MAIN:
1687 case REQ_VIEW_DIFF:
1688 case REQ_VIEW_LOG:
1689 case REQ_VIEW_HELP:
1690 case REQ_VIEW_PAGER:
1691 open_view(view, request, OPEN_DEFAULT);
1692 break;
1693
1694 case REQ_NEXT:
1695 case REQ_PREVIOUS:
1696 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
1697
1698 if (view == VIEW(REQ_VIEW_DIFF) &&
1699 view->parent == VIEW(REQ_VIEW_MAIN)) {
1700 bool redraw = display[1] == view;
1701
1702 view = view->parent;
1703 move_view(view, request, redraw);
1704 if (redraw)
1705 update_view_title(view);
1706 } else {
1707 move_view(view, request, TRUE);
1708 break;
1709 }
1710 /* Fall-through */
1711
1712 case REQ_ENTER:
1713 if (!view->lines) {
1714 report("Nothing to enter");
1715 break;
1716 }
1717 return view->ops->enter(view, &view->line[view->lineno]);
1718
1719 case REQ_VIEW_NEXT:
1720 {
1721 int nviews = displayed_views();
1722 int next_view = (current_view + 1) % nviews;
1723
1724 if (next_view == current_view) {
1725 report("Only one view is displayed");
1726 break;
1727 }
1728
1729 current_view = next_view;
1730 /* Blur out the title of the previous view. */
1731 update_view_title(view);
1732 report("");
1733 break;
1734 }
1735 case REQ_TOGGLE_LINENO:
1736 opt_line_number = !opt_line_number;
1737 redraw_display();
1738 break;
1739
1740 case REQ_TOGGLE_REV_GRAPH:
1741 opt_rev_graph = !opt_rev_graph;
1742 redraw_display();
1743 break;
1744
1745 case REQ_PROMPT:
1746 /* Always reload^Wrerun commands from the prompt. */
1747 open_view(view, opt_request, OPEN_RELOAD);
1748 break;
1749
1750 case REQ_STOP_LOADING:
1751 for (i = 0; i < ARRAY_SIZE(views); i++) {
1752 view = &views[i];
1753 if (view->pipe)
1754 report("Stopped loading the %s view", view->name),
1755 end_update(view);
1756 }
1757 break;
1758
1759 case REQ_SHOW_VERSION:
1760 report("%s (built %s)", VERSION, __DATE__);
1761 return TRUE;
1762
1763 case REQ_SCREEN_RESIZE:
1764 resize_display();
1765 /* Fall-through */
1766 case REQ_SCREEN_REDRAW:
1767 redraw_display();
1768 break;
1769
1770 case REQ_SCREEN_UPDATE:
1771 doupdate();
1772 return TRUE;
1773
1774 case REQ_VIEW_CLOSE:
1775 /* XXX: Mark closed views by letting view->parent point to the
1776 * view itself. Parents to closed view should never be
1777 * followed. */
1778 if (view->parent &&
1779 view->parent->parent != view->parent) {
1780 memset(display, 0, sizeof(display));
1781 current_view = 0;
1782 display[current_view] = view->parent;
1783 view->parent = view;
1784 resize_display();
1785 redraw_display();
1786 break;
1787 }
1788 /* Fall-through */
1789 case REQ_QUIT:
1790 return FALSE;
1791
1792 default:
1793 /* An unknown key will show most commonly used commands. */
1794 report("Unknown key, press 'h' for help");
1795 return TRUE;
1796 }
1797
1798 return TRUE;
1799 }
1800
1801
1802 /*
1803 * Pager backend
1804 */
1805
1806 static bool
1807 pager_draw(struct view *view, struct line *line, unsigned int lineno)
1808 {
1809 char *text = line->data;
1810 enum line_type type = line->type;
1811 int textlen = strlen(text);
1812 int attr;
1813
1814 wmove(view->win, lineno, 0);
1815
1816 if (view->offset + lineno == view->lineno) {
1817 if (type == LINE_COMMIT) {
1818 string_copy(view->ref, text + 7);
1819 string_copy(ref_commit, view->ref);
1820 }
1821
1822 type = LINE_CURSOR;
1823 wchgat(view->win, -1, 0, type, NULL);
1824 }
1825
1826 attr = get_line_attr(type);
1827 wattrset(view->win, attr);
1828
1829 if (opt_line_number || opt_tab_size < TABSIZE) {
1830 static char spaces[] = " ";
1831 int col_offset = 0, col = 0;
1832
1833 if (opt_line_number) {
1834 unsigned long real_lineno = view->offset + lineno + 1;
1835
1836 if (real_lineno == 1 ||
1837 (real_lineno % opt_num_interval) == 0) {
1838 wprintw(view->win, "%.*d", view->digits, real_lineno);
1839
1840 } else {
1841 waddnstr(view->win, spaces,
1842 MIN(view->digits, STRING_SIZE(spaces)));
1843 }
1844 waddstr(view->win, ": ");
1845 col_offset = view->digits + 2;
1846 }
1847
1848 while (text && col_offset + col < view->width) {
1849 int cols_max = view->width - col_offset - col;
1850 char *pos = text;
1851 int cols;
1852
1853 if (*text == '\t') {
1854 text++;
1855 assert(sizeof(spaces) > TABSIZE);
1856 pos = spaces;
1857 cols = opt_tab_size - (col % opt_tab_size);
1858
1859 } else {
1860 text = strchr(text, '\t');
1861 cols = line ? text - pos : strlen(pos);
1862 }
1863
1864 waddnstr(view->win, pos, MIN(cols, cols_max));
1865 col += cols;
1866 }
1867
1868 } else {
1869 int col = 0, pos = 0;
1870
1871 for (; pos < textlen && col < view->width; pos++, col++)
1872 if (text[pos] == '\t')
1873 col += TABSIZE - (col % TABSIZE) - 1;
1874
1875 waddnstr(view->win, text, pos);
1876 }
1877
1878 return TRUE;
1879 }
1880
1881 static void
1882 add_pager_refs(struct view *view, struct line *line)
1883 {
1884 char buf[1024];
1885 char *data = line->data;
1886 struct ref **refs;
1887 int bufpos = 0, refpos = 0;
1888 const char *sep = "Refs: ";
1889
1890 assert(line->type == LINE_COMMIT);
1891
1892 refs = get_refs(data + STRING_SIZE("commit "));
1893 if (!refs)
1894 return;
1895
1896 do {
1897 struct ref *ref = refs[refpos];
1898 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
1899
1900 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
1901 return;
1902 sep = ", ";
1903 } while (refs[refpos++]->next);
1904
1905 if (!realloc_lines(view, view->line_size + 1))
1906 return;
1907
1908 line = &view->line[view->lines];
1909 line->data = strdup(buf);
1910 if (!line->data)
1911 return;
1912
1913 line->type = LINE_PP_REFS;
1914 view->lines++;
1915 }
1916
1917 static bool
1918 pager_read(struct view *view, char *data)
1919 {
1920 struct line *line = &view->line[view->lines];
1921
1922 line->data = strdup(data);
1923 if (!line->data)
1924 return FALSE;
1925
1926 line->type = get_line_type(line->data);
1927 view->lines++;
1928
1929 if (line->type == LINE_COMMIT &&
1930 (view == VIEW(REQ_VIEW_DIFF) ||
1931 view == VIEW(REQ_VIEW_LOG)))
1932 add_pager_refs(view, line);
1933
1934 return TRUE;
1935 }
1936
1937 static bool
1938 pager_enter(struct view *view, struct line *line)
1939 {
1940 int split = 0;
1941
1942 if (line->type == LINE_COMMIT &&
1943 (view == VIEW(REQ_VIEW_LOG) ||
1944 view == VIEW(REQ_VIEW_PAGER))) {
1945 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
1946 split = 1;
1947 }
1948
1949 /* Always scroll the view even if it was split. That way
1950 * you can use Enter to scroll through the log view and
1951 * split open each commit diff. */
1952 scroll_view(view, REQ_SCROLL_LINE_DOWN);
1953
1954 /* FIXME: A minor workaround. Scrolling the view will call report("")
1955 * but if we are scrolling a non-current view this won't properly
1956 * update the view title. */
1957 if (split)
1958 update_view_title(view);
1959
1960 return TRUE;
1961 }
1962
1963 static struct view_ops pager_ops = {
1964 "line",
1965 pager_draw,
1966 pager_read,
1967 pager_enter,
1968 };
1969
1970
1971 /*
1972 * Main view backend
1973 */
1974
1975 struct commit {
1976 char id[41]; /* SHA1 ID. */
1977 char title[75]; /* First line of the commit message. */
1978 char author[75]; /* Author of the commit. */
1979 struct tm time; /* Date from the author ident. */
1980 struct ref **refs; /* Repository references. */
1981 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
1982 size_t graph_size; /* The width of the graph array. */
1983 };
1984
1985 static bool
1986 main_draw(struct view *view, struct line *line, unsigned int lineno)
1987 {
1988 char buf[DATE_COLS + 1];
1989 struct commit *commit = line->data;
1990 enum line_type type;
1991 int col = 0;
1992 size_t timelen;
1993 size_t authorlen;
1994 int trimmed = 1;
1995
1996 if (!*commit->author)
1997 return FALSE;
1998
1999 wmove(view->win, lineno, col);
2000
2001 if (view->offset + lineno == view->lineno) {
2002 string_copy(view->ref, commit->id);
2003 string_copy(ref_commit, view->ref);
2004 type = LINE_CURSOR;
2005 wattrset(view->win, get_line_attr(type));
2006 wchgat(view->win, -1, 0, type, NULL);
2007
2008 } else {
2009 type = LINE_MAIN_COMMIT;
2010 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2011 }
2012
2013 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2014 waddnstr(view->win, buf, timelen);
2015 waddstr(view->win, " ");
2016
2017 col += DATE_COLS;
2018 wmove(view->win, lineno, col);
2019 if (type != LINE_CURSOR)
2020 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2021
2022 if (opt_utf8) {
2023 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2024 } else {
2025 authorlen = strlen(commit->author);
2026 if (authorlen > AUTHOR_COLS - 2) {
2027 authorlen = AUTHOR_COLS - 2;
2028 trimmed = 1;
2029 }
2030 }
2031
2032 if (trimmed) {
2033 waddnstr(view->win, commit->author, authorlen);
2034 if (type != LINE_CURSOR)
2035 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2036 waddch(view->win, '~');
2037 } else {
2038 waddstr(view->win, commit->author);
2039 }
2040
2041 col += AUTHOR_COLS;
2042 if (type != LINE_CURSOR)
2043 wattrset(view->win, A_NORMAL);
2044
2045 if (opt_rev_graph && commit->graph_size) {
2046 size_t i;
2047
2048 wmove(view->win, lineno, col);
2049 /* Using waddch() instead of waddnstr() ensures that
2050 * they'll be rendered correctly for the cursor line. */
2051 for (i = 0; i < commit->graph_size; i++)
2052 waddch(view->win, commit->graph[i]);
2053
2054 col += commit->graph_size + 1;
2055 }
2056
2057 wmove(view->win, lineno, col);
2058
2059 if (commit->refs) {
2060 size_t i = 0;
2061
2062 do {
2063 if (type == LINE_CURSOR)
2064 ;
2065 else if (commit->refs[i]->tag)
2066 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2067 else
2068 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2069 waddstr(view->win, "[");
2070 waddstr(view->win, commit->refs[i]->name);
2071 waddstr(view->win, "]");
2072 if (type != LINE_CURSOR)
2073 wattrset(view->win, A_NORMAL);
2074 waddstr(view->win, " ");
2075 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2076 } while (commit->refs[i++]->next);
2077 }
2078
2079 if (type != LINE_CURSOR)
2080 wattrset(view->win, get_line_attr(type));
2081
2082 {
2083 int titlelen = strlen(commit->title);
2084
2085 if (col + titlelen > view->width)
2086 titlelen = view->width - col;
2087
2088 waddnstr(view->win, commit->title, titlelen);
2089 }
2090
2091 return TRUE;
2092 }
2093
2094 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2095 static bool
2096 main_read(struct view *view, char *line)
2097 {
2098 enum line_type type = get_line_type(line);
2099 struct commit *commit = view->lines
2100 ? view->line[view->lines - 1].data : NULL;
2101
2102 switch (type) {
2103 case LINE_COMMIT:
2104 commit = calloc(1, sizeof(struct commit));
2105 if (!commit)
2106 return FALSE;
2107
2108 line += STRING_SIZE("commit ");
2109
2110 view->line[view->lines++].data = commit;
2111 string_copy(commit->id, line);
2112 commit->refs = get_refs(commit->id);
2113 commit->graph[commit->graph_size++] = ACS_LTEE;
2114 break;
2115
2116 case LINE_AUTHOR:
2117 {
2118 char *ident = line + STRING_SIZE("author ");
2119 char *end = strchr(ident, '<');
2120
2121 if (!commit)
2122 break;
2123
2124 if (end) {
2125 for (; end > ident && isspace(end[-1]); end--) ;
2126 *end = 0;
2127 }
2128
2129 string_copy(commit->author, ident);
2130
2131 /* Parse epoch and timezone */
2132 if (end) {
2133 char *secs = strchr(end + 1, '>');
2134 char *zone;
2135 time_t time;
2136
2137 if (!secs || secs[1] != ' ')
2138 break;
2139
2140 secs += 2;
2141 time = (time_t) atol(secs);
2142 zone = strchr(secs, ' ');
2143 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2144 long tz;
2145
2146 zone++;
2147 tz = ('0' - zone[1]) * 60 * 60 * 10;
2148 tz += ('0' - zone[2]) * 60 * 60;
2149 tz += ('0' - zone[3]) * 60;
2150 tz += ('0' - zone[4]) * 60;
2151
2152 if (zone[0] == '-')
2153 tz = -tz;
2154
2155 time -= tz;
2156 }
2157 gmtime_r(&time, &commit->time);
2158 }
2159 break;
2160 }
2161 default:
2162 if (!commit)
2163 break;
2164
2165 /* Fill in the commit title if it has not already been set. */
2166 if (commit->title[0])
2167 break;
2168
2169 /* Require titles to start with a non-space character at the
2170 * offset used by git log. */
2171 /* FIXME: More gracefull handling of titles; append "..." to
2172 * shortened titles, etc. */
2173 if (strncmp(line, " ", 4) ||
2174 isspace(line[4]))
2175 break;
2176
2177 string_copy(commit->title, line + 4);
2178 }
2179
2180 return TRUE;
2181 }
2182
2183 static bool
2184 main_enter(struct view *view, struct line *line)
2185 {
2186 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2187
2188 open_view(view, REQ_VIEW_DIFF, flags);
2189 return TRUE;
2190 }
2191
2192 static struct view_ops main_ops = {
2193 "commit",
2194 main_draw,
2195 main_read,
2196 main_enter,
2197 };
2198
2199
2200 /*
2201 * Unicode / UTF-8 handling
2202 *
2203 * NOTE: Much of the following code for dealing with unicode is derived from
2204 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2205 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2206 */
2207
2208 /* I've (over)annotated a lot of code snippets because I am not entirely
2209 * confident that the approach taken by this small UTF-8 interface is correct.
2210 * --jonas */
2211
2212 static inline int
2213 unicode_width(unsigned long c)
2214 {
2215 if (c >= 0x1100 &&
2216 (c <= 0x115f /* Hangul Jamo */
2217 || c == 0x2329
2218 || c == 0x232a
2219 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2220 /* CJK ... Yi */
2221 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2222 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2223 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2224 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2225 || (c >= 0xffe0 && c <= 0xffe6)
2226 || (c >= 0x20000 && c <= 0x2fffd)
2227 || (c >= 0x30000 && c <= 0x3fffd)))
2228 return 2;
2229
2230 return 1;
2231 }
2232
2233 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2234 * Illegal bytes are set one. */
2235 static const unsigned char utf8_bytes[256] = {
2236 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,
2237 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,
2238 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,
2239 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,
2240 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,
2241 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,
2242 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,
2243 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,
2244 };
2245
2246 /* Decode UTF-8 multi-byte representation into a unicode character. */
2247 static inline unsigned long
2248 utf8_to_unicode(const char *string, size_t length)
2249 {
2250 unsigned long unicode;
2251
2252 switch (length) {
2253 case 1:
2254 unicode = string[0];
2255 break;
2256 case 2:
2257 unicode = (string[0] & 0x1f) << 6;
2258 unicode += (string[1] & 0x3f);
2259 break;
2260 case 3:
2261 unicode = (string[0] & 0x0f) << 12;
2262 unicode += ((string[1] & 0x3f) << 6);
2263 unicode += (string[2] & 0x3f);
2264 break;
2265 case 4:
2266 unicode = (string[0] & 0x0f) << 18;
2267 unicode += ((string[1] & 0x3f) << 12);
2268 unicode += ((string[2] & 0x3f) << 6);
2269 unicode += (string[3] & 0x3f);
2270 break;
2271 case 5:
2272 unicode = (string[0] & 0x0f) << 24;
2273 unicode += ((string[1] & 0x3f) << 18);
2274 unicode += ((string[2] & 0x3f) << 12);
2275 unicode += ((string[3] & 0x3f) << 6);
2276 unicode += (string[4] & 0x3f);
2277 break;
2278 case 6:
2279 unicode = (string[0] & 0x01) << 30;
2280 unicode += ((string[1] & 0x3f) << 24);
2281 unicode += ((string[2] & 0x3f) << 18);
2282 unicode += ((string[3] & 0x3f) << 12);
2283 unicode += ((string[4] & 0x3f) << 6);
2284 unicode += (string[5] & 0x3f);
2285 break;
2286 default:
2287 die("Invalid unicode length");
2288 }
2289
2290 /* Invalid characters could return the special 0xfffd value but NUL
2291 * should be just as good. */
2292 return unicode > 0xffff ? 0 : unicode;
2293 }
2294
2295 /* Calculates how much of string can be shown within the given maximum width
2296 * and sets trimmed parameter to non-zero value if all of string could not be
2297 * shown.
2298 *
2299 * Additionally, adds to coloffset how many many columns to move to align with
2300 * the expected position. Takes into account how multi-byte and double-width
2301 * characters will effect the cursor position.
2302 *
2303 * Returns the number of bytes to output from string to satisfy max_width. */
2304 static size_t
2305 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
2306 {
2307 const char *start = string;
2308 const char *end = strchr(string, '\0');
2309 size_t mbwidth = 0;
2310 size_t width = 0;
2311
2312 *trimmed = 0;
2313
2314 while (string < end) {
2315 int c = *(unsigned char *) string;
2316 unsigned char bytes = utf8_bytes[c];
2317 size_t ucwidth;
2318 unsigned long unicode;
2319
2320 if (string + bytes > end)
2321 break;
2322
2323 /* Change representation to figure out whether
2324 * it is a single- or double-width character. */
2325
2326 unicode = utf8_to_unicode(string, bytes);
2327 /* FIXME: Graceful handling of invalid unicode character. */
2328 if (!unicode)
2329 break;
2330
2331 ucwidth = unicode_width(unicode);
2332 width += ucwidth;
2333 if (width > max_width) {
2334 *trimmed = 1;
2335 break;
2336 }
2337
2338 /* The column offset collects the differences between the
2339 * number of bytes encoding a character and the number of
2340 * columns will be used for rendering said character.
2341 *
2342 * So if some character A is encoded in 2 bytes, but will be
2343 * represented on the screen using only 1 byte this will and up
2344 * adding 1 to the multi-byte column offset.
2345 *
2346 * Assumes that no double-width character can be encoding in
2347 * less than two bytes. */
2348 if (bytes > ucwidth)
2349 mbwidth += bytes - ucwidth;
2350
2351 string += bytes;
2352 }
2353
2354 *coloffset += mbwidth;
2355
2356 return string - start;
2357 }
2358
2359
2360 /*
2361 * Status management
2362 */
2363
2364 /* Whether or not the curses interface has been initialized. */
2365 static bool cursed = FALSE;
2366
2367 /* The status window is used for polling keystrokes. */
2368 static WINDOW *status_win;
2369
2370 /* Update status and title window. */
2371 static void
2372 report(const char *msg, ...)
2373 {
2374 static bool empty = TRUE;
2375 struct view *view = display[current_view];
2376
2377 if (!empty || *msg) {
2378 va_list args;
2379
2380 va_start(args, msg);
2381
2382 werase(status_win);
2383 wmove(status_win, 0, 0);
2384 if (*msg) {
2385 vwprintw(status_win, msg, args);
2386 empty = FALSE;
2387 } else {
2388 empty = TRUE;
2389 }
2390 wrefresh(status_win);
2391
2392 va_end(args);
2393 }
2394
2395 update_view_title(view);
2396 update_display_cursor();
2397 }
2398
2399 /* Controls when nodelay should be in effect when polling user input. */
2400 static void
2401 set_nonblocking_input(bool loading)
2402 {
2403 static unsigned int loading_views;
2404
2405 if ((loading == FALSE && loading_views-- == 1) ||
2406 (loading == TRUE && loading_views++ == 0))
2407 nodelay(status_win, loading);
2408 }
2409
2410 static void
2411 init_display(void)
2412 {
2413 int x, y;
2414
2415 /* Initialize the curses library */
2416 if (isatty(STDIN_FILENO)) {
2417 cursed = !!initscr();
2418 } else {
2419 /* Leave stdin and stdout alone when acting as a pager. */
2420 FILE *io = fopen("/dev/tty", "r+");
2421
2422 cursed = !!newterm(NULL, io, io);
2423 }
2424
2425 if (!cursed)
2426 die("Failed to initialize curses");
2427
2428 nonl(); /* Tell curses not to do NL->CR/NL on output */
2429 cbreak(); /* Take input chars one at a time, no wait for \n */
2430 noecho(); /* Don't echo input */
2431 leaveok(stdscr, TRUE);
2432
2433 if (has_colors())
2434 init_colors();
2435
2436 getmaxyx(stdscr, y, x);
2437 status_win = newwin(1, 0, y - 1, 0);
2438 if (!status_win)
2439 die("Failed to create status window");
2440
2441 /* Enable keyboard mapping */
2442 keypad(status_win, TRUE);
2443 wbkgdset(status_win, get_line_attr(LINE_STATUS));
2444 }
2445
2446
2447 /*
2448 * Repository references
2449 */
2450
2451 static struct ref *refs;
2452 static size_t refs_size;
2453
2454 /* Id <-> ref store */
2455 static struct ref ***id_refs;
2456 static size_t id_refs_size;
2457
2458 static struct ref **
2459 get_refs(char *id)
2460 {
2461 struct ref ***tmp_id_refs;
2462 struct ref **ref_list = NULL;
2463 size_t ref_list_size = 0;
2464 size_t i;
2465
2466 for (i = 0; i < id_refs_size; i++)
2467 if (!strcmp(id, id_refs[i][0]->id))
2468 return id_refs[i];
2469
2470 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
2471 if (!tmp_id_refs)
2472 return NULL;
2473
2474 id_refs = tmp_id_refs;
2475
2476 for (i = 0; i < refs_size; i++) {
2477 struct ref **tmp;
2478
2479 if (strcmp(id, refs[i].id))
2480 continue;
2481
2482 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
2483 if (!tmp) {
2484 if (ref_list)
2485 free(ref_list);
2486 return NULL;
2487 }
2488
2489 ref_list = tmp;
2490 if (ref_list_size > 0)
2491 ref_list[ref_list_size - 1]->next = 1;
2492 ref_list[ref_list_size] = &refs[i];
2493
2494 /* XXX: The properties of the commit chains ensures that we can
2495 * safely modify the shared ref. The repo references will
2496 * always be similar for the same id. */
2497 ref_list[ref_list_size]->next = 0;
2498 ref_list_size++;
2499 }
2500
2501 if (ref_list)
2502 id_refs[id_refs_size++] = ref_list;
2503
2504 return ref_list;
2505 }
2506
2507 static int
2508 read_ref(char *id, int idlen, char *name, int namelen)
2509 {
2510 struct ref *ref;
2511 bool tag = FALSE;
2512
2513 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
2514 /* Commits referenced by tags has "^{}" appended. */
2515 if (name[namelen - 1] != '}')
2516 return OK;
2517
2518 while (namelen > 0 && name[namelen] != '^')
2519 namelen--;
2520
2521 tag = TRUE;
2522 namelen -= STRING_SIZE("refs/tags/");
2523 name += STRING_SIZE("refs/tags/");
2524
2525 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
2526 namelen -= STRING_SIZE("refs/heads/");
2527 name += STRING_SIZE("refs/heads/");
2528
2529 } else if (!strcmp(name, "HEAD")) {
2530 return OK;
2531 }
2532
2533 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
2534 if (!refs)
2535 return ERR;
2536
2537 ref = &refs[refs_size++];
2538 ref->name = malloc(namelen + 1);
2539 if (!ref->name)
2540 return ERR;
2541
2542 strncpy(ref->name, name, namelen);
2543 ref->name[namelen] = 0;
2544 ref->tag = tag;
2545 string_copy(ref->id, id);
2546
2547 return OK;
2548 }
2549
2550 static int
2551 load_refs(void)
2552 {
2553 const char *cmd_env = getenv("TIG_LS_REMOTE");
2554 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
2555
2556 return read_properties(popen(cmd, "r"), "\t", read_ref);
2557 }
2558
2559 static int
2560 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
2561 {
2562 if (!strcmp(name, "i18n.commitencoding"))
2563 string_copy(opt_encoding, value);
2564
2565 return OK;
2566 }
2567
2568 static int
2569 load_repo_config(void)
2570 {
2571 return read_properties(popen("git repo-config --list", "r"),
2572 "=", read_repo_config_option);
2573 }
2574
2575 static int
2576 read_properties(FILE *pipe, const char *separators,
2577 int (*read_property)(char *, int, char *, int))
2578 {
2579 char buffer[BUFSIZ];
2580 char *name;
2581 int state = OK;
2582
2583 if (!pipe)
2584 return ERR;
2585
2586 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
2587 char *value;
2588 size_t namelen;
2589 size_t valuelen;
2590
2591 name = chomp_string(name);
2592 namelen = strcspn(name, separators);
2593
2594 if (name[namelen]) {
2595 name[namelen] = 0;
2596 value = chomp_string(name + namelen + 1);
2597 valuelen = strlen(value);
2598
2599 } else {
2600 value = "";
2601 valuelen = 0;
2602 }
2603
2604 state = read_property(name, namelen, value, valuelen);
2605 }
2606
2607 if (state != ERR && ferror(pipe))
2608 state = ERR;
2609
2610 pclose(pipe);
2611
2612 return state;
2613 }
2614
2615
2616 /*
2617 * Main
2618 */
2619
2620 static void __NORETURN
2621 quit(int sig)
2622 {
2623 /* XXX: Restore tty modes and let the OS cleanup the rest! */
2624 if (cursed)
2625 endwin();
2626 exit(0);
2627 }
2628
2629 static void __NORETURN
2630 die(const char *err, ...)
2631 {
2632 va_list args;
2633
2634 endwin();
2635
2636 va_start(args, err);
2637 fputs("tig: ", stderr);
2638 vfprintf(stderr, err, args);
2639 fputs("\n", stderr);
2640 va_end(args);
2641
2642 exit(1);
2643 }
2644
2645 int
2646 main(int argc, char *argv[])
2647 {
2648 struct view *view;
2649 enum request request;
2650 size_t i;
2651
2652 signal(SIGINT, quit);
2653
2654 if (load_options() == ERR)
2655 die("Failed to load user config.");
2656
2657 /* Load the repo config file so options can be overwritten from
2658 * the command line. */
2659 if (load_repo_config() == ERR)
2660 die("Failed to load repo config.");
2661
2662 if (!parse_options(argc, argv))
2663 return 0;
2664
2665 if (load_refs() == ERR)
2666 die("Failed to load refs.");
2667
2668 /* Require a git repository unless when running in pager mode. */
2669 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
2670 die("Not a git repository");
2671
2672 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
2673 view->cmd_env = getenv(view->cmd_env);
2674
2675 request = opt_request;
2676
2677 init_display();
2678
2679 while (view_driver(display[current_view], request)) {
2680 int key;
2681 int i;
2682
2683 foreach_view (view, i)
2684 update_view(view);
2685
2686 /* Refresh, accept single keystroke of input */
2687 key = wgetch(status_win);
2688 request = get_request(key);
2689
2690 /* Some low-level request handling. This keeps access to
2691 * status_win restricted. */
2692 switch (request) {
2693 case REQ_PROMPT:
2694 report(":");
2695 /* Temporarily switch to line-oriented and echoed
2696 * input. */
2697 nocbreak();
2698 echo();
2699
2700 if (wgetnstr(status_win, opt_cmd + 4, sizeof(opt_cmd) - 4) == OK) {
2701 memcpy(opt_cmd, "git ", 4);
2702 opt_request = REQ_VIEW_PAGER;
2703 } else {
2704 report("Prompt interrupted by loading view, "
2705 "press 'z' to stop loading views");
2706 request = REQ_SCREEN_UPDATE;
2707 }
2708
2709 noecho();
2710 cbreak();
2711 break;
2712
2713 case REQ_SCREEN_RESIZE:
2714 {
2715 int height, width;
2716
2717 getmaxyx(stdscr, height, width);
2718
2719 /* Resize the status view and let the view driver take
2720 * care of resizing the displayed views. */
2721 wresize(status_win, 1, width);
2722 mvwin(status_win, height - 1, 0);
2723 wrefresh(status_win);
2724 break;
2725 }
2726 default:
2727 break;
2728 }
2729 }
2730
2731 quit(0);
2732
2733 return 0;
2734 }
Full-screen terminal Git browser.