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Rename keymap to keybinding, get_request to get_keybinding
[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 static int
182 string_enum_compare(const char *str1, const char *str2, int len)
183 {
184 size_t i;
185
186 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
187
188 /* Diff-Header == DIFF_HEADER */
189 for (i = 0; i < len; i++) {
190 if (toupper(str1[i]) == toupper(str2[i]))
191 continue;
192
193 if (string_enum_sep(str1[i]) &&
194 string_enum_sep(str2[i]))
195 continue;
196
197 return str1[i] - str2[i];
198 }
199
200 return 0;
201 }
202
203 /* Shell quoting
204 *
205 * NOTE: The following is a slightly modified copy of the git project's shell
206 * quoting routines found in the quote.c file.
207 *
208 * Help to copy the thing properly quoted for the shell safety. any single
209 * quote is replaced with '\'', any exclamation point is replaced with '\!',
210 * and the whole thing is enclosed in a
211 *
212 * E.g.
213 * original sq_quote result
214 * name ==> name ==> 'name'
215 * a b ==> a b ==> 'a b'
216 * a'b ==> a'\''b ==> 'a'\''b'
217 * a!b ==> a'\!'b ==> 'a'\!'b'
218 */
219
220 static size_t
221 sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src)
222 {
223 char c;
224
225 #define BUFPUT(x) do { if (bufsize < SIZEOF_CMD) buf[bufsize++] = (x); } while (0)
226
227 BUFPUT('\'');
228 while ((c = *src++)) {
229 if (c == '\'' || c == '!') {
230 BUFPUT('\'');
231 BUFPUT('\\');
232 BUFPUT(c);
233 BUFPUT('\'');
234 } else {
235 BUFPUT(c);
236 }
237 }
238 BUFPUT('\'');
239
240 return bufsize;
241 }
242
243
244 /*
245 * User requests
246 */
247
248 #define REQ_INFO \
249 /* XXX: Keep the view request first and in sync with views[]. */ \
250 REQ_GROUP("View switching") \
251 REQ_(VIEW_MAIN, "Show main view"), \
252 REQ_(VIEW_DIFF, "Show diff view"), \
253 REQ_(VIEW_LOG, "Show log view"), \
254 REQ_(VIEW_HELP, "Show help page"), \
255 REQ_(VIEW_PAGER, "Show pager view"), \
256 \
257 REQ_GROUP("View manipulation") \
258 REQ_(ENTER, "Enter current line and scroll"), \
259 REQ_(NEXT, "Move to next"), \
260 REQ_(PREVIOUS, "Move to previous"), \
261 REQ_(VIEW_NEXT, "Move focus to next view"), \
262 REQ_(VIEW_CLOSE, "Close the current view"), \
263 REQ_(QUIT, "Close all views and quit"), \
264 \
265 REQ_GROUP("Cursor navigation") \
266 REQ_(MOVE_UP, "Move cursor one line up"), \
267 REQ_(MOVE_DOWN, "Move cursor one line down"), \
268 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
269 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
270 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
271 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
272 \
273 REQ_GROUP("Scrolling") \
274 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
275 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
276 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
277 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
278 \
279 REQ_GROUP("Misc") \
280 REQ_(PROMPT, "Bring up the prompt"), \
281 REQ_(SCREEN_UPDATE, "Update the screen"), \
282 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
283 REQ_(SCREEN_RESIZE, "Resize the screen"), \
284 REQ_(SHOW_VERSION, "Show version information"), \
285 REQ_(STOP_LOADING, "Stop all loading views"), \
286 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
287 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization"),
288
289
290 /* User action requests. */
291 enum request {
292 #define REQ_GROUP(help)
293 #define REQ_(req, help) REQ_##req
294
295 /* Offset all requests to avoid conflicts with ncurses getch values. */
296 REQ_OFFSET = KEY_MAX + 1,
297 REQ_INFO
298
299 #undef REQ_GROUP
300 #undef REQ_
301 };
302
303 struct request_info {
304 enum request request;
305 char *help;
306 };
307
308 static struct request_info req_info[] = {
309 #define REQ_GROUP(help) { 0, (help) },
310 #define REQ_(req, help) { REQ_##req, (help) }
311 REQ_INFO
312 #undef REQ_GROUP
313 #undef REQ_
314 };
315
316 /*
317 * Options
318 */
319
320 static const char usage[] =
321 VERSION " (" __DATE__ ")\n"
322 "\n"
323 "Usage: tig [options]\n"
324 " or: tig [options] [--] [git log options]\n"
325 " or: tig [options] log [git log options]\n"
326 " or: tig [options] diff [git diff options]\n"
327 " or: tig [options] show [git show options]\n"
328 " or: tig [options] < [git command output]\n"
329 "\n"
330 "Options:\n"
331 " -l Start up in log view\n"
332 " -d Start up in diff view\n"
333 " -n[I], --line-number[=I] Show line numbers with given interval\n"
334 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
335 " -- Mark end of tig options\n"
336 " -v, --version Show version and exit\n"
337 " -h, --help Show help message and exit\n";
338
339 /* Option and state variables. */
340 static bool opt_line_number = FALSE;
341 static bool opt_rev_graph = TRUE;
342 static int opt_num_interval = NUMBER_INTERVAL;
343 static int opt_tab_size = TABSIZE;
344 static enum request opt_request = REQ_VIEW_MAIN;
345 static char opt_cmd[SIZEOF_CMD] = "";
346 static char opt_encoding[20] = "";
347 static bool opt_utf8 = TRUE;
348 static FILE *opt_pipe = NULL;
349
350 enum option_type {
351 OPT_NONE,
352 OPT_INT,
353 };
354
355 static bool
356 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
357 {
358 va_list args;
359 char *value = "";
360 int *number;
361
362 if (opt[0] != '-')
363 return FALSE;
364
365 if (opt[1] == '-') {
366 int namelen = strlen(name);
367
368 opt += 2;
369
370 if (strncmp(opt, name, namelen))
371 return FALSE;
372
373 if (opt[namelen] == '=')
374 value = opt + namelen + 1;
375
376 } else {
377 if (!short_name || opt[1] != short_name)
378 return FALSE;
379 value = opt + 2;
380 }
381
382 va_start(args, type);
383 if (type == OPT_INT) {
384 number = va_arg(args, int *);
385 if (isdigit(*value))
386 *number = atoi(value);
387 }
388 va_end(args);
389
390 return TRUE;
391 }
392
393 /* Returns the index of log or diff command or -1 to exit. */
394 static bool
395 parse_options(int argc, char *argv[])
396 {
397 int i;
398
399 for (i = 1; i < argc; i++) {
400 char *opt = argv[i];
401
402 if (!strcmp(opt, "-l")) {
403 opt_request = REQ_VIEW_LOG;
404 continue;
405 }
406
407 if (!strcmp(opt, "-d")) {
408 opt_request = REQ_VIEW_DIFF;
409 continue;
410 }
411
412 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
413 opt_line_number = TRUE;
414 continue;
415 }
416
417 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
418 opt_tab_size = MIN(opt_tab_size, TABSIZE);
419 continue;
420 }
421
422 if (check_option(opt, 'v', "version", OPT_NONE)) {
423 printf("tig version %s\n", VERSION);
424 return FALSE;
425 }
426
427 if (check_option(opt, 'h', "help", OPT_NONE)) {
428 printf(usage);
429 return FALSE;
430 }
431
432 if (!strcmp(opt, "--")) {
433 i++;
434 break;
435 }
436
437 if (!strcmp(opt, "log") ||
438 !strcmp(opt, "diff") ||
439 !strcmp(opt, "show")) {
440 opt_request = opt[0] == 'l'
441 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
442 break;
443 }
444
445 if (opt[0] && opt[0] != '-')
446 break;
447
448 die("unknown option '%s'\n\n%s", opt, usage);
449 }
450
451 if (!isatty(STDIN_FILENO)) {
452 opt_request = REQ_VIEW_PAGER;
453 opt_pipe = stdin;
454
455 } else if (i < argc) {
456 size_t buf_size;
457
458 if (opt_request == REQ_VIEW_MAIN)
459 /* XXX: This is vulnerable to the user overriding
460 * options required for the main view parser. */
461 string_copy(opt_cmd, "git log --stat --pretty=raw");
462 else
463 string_copy(opt_cmd, "git");
464 buf_size = strlen(opt_cmd);
465
466 while (buf_size < sizeof(opt_cmd) && i < argc) {
467 opt_cmd[buf_size++] = ' ';
468 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
469 }
470
471 if (buf_size >= sizeof(opt_cmd))
472 die("command too long");
473
474 opt_cmd[buf_size] = 0;
475
476 }
477
478 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
479 opt_utf8 = FALSE;
480
481 return TRUE;
482 }
483
484
485 /*
486 * Line-oriented content detection.
487 */
488
489 #define LINE_INFO \
490 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
491 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
492 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
493 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
494 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
495 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
496 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
497 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
498 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
499 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
500 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
501 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
502 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
503 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
504 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
505 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
506 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
507 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
508 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
509 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
510 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
511 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
512 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
513 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
514 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
515 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
516 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
517 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
518 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
519 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
520 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
521 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
522 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
523 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
524 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
525 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
526 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
527 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
528
529 enum line_type {
530 #define LINE(type, line, fg, bg, attr) \
531 LINE_##type
532 LINE_INFO
533 #undef LINE
534 };
535
536 struct line_info {
537 const char *name; /* Option name. */
538 int namelen; /* Size of option name. */
539 const char *line; /* The start of line to match. */
540 int linelen; /* Size of string to match. */
541 int fg, bg, attr; /* Color and text attributes for the lines. */
542 };
543
544 static struct line_info line_info[] = {
545 #define LINE(type, line, fg, bg, attr) \
546 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
547 LINE_INFO
548 #undef LINE
549 };
550
551 static enum line_type
552 get_line_type(char *line)
553 {
554 int linelen = strlen(line);
555 enum line_type type;
556
557 for (type = 0; type < ARRAY_SIZE(line_info); type++)
558 /* Case insensitive search matches Signed-off-by lines better. */
559 if (linelen >= line_info[type].linelen &&
560 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
561 return type;
562
563 return LINE_DEFAULT;
564 }
565
566 static inline int
567 get_line_attr(enum line_type type)
568 {
569 assert(type < ARRAY_SIZE(line_info));
570 return COLOR_PAIR(type) | line_info[type].attr;
571 }
572
573 static struct line_info *
574 get_line_info(char *name, int namelen)
575 {
576 enum line_type type;
577
578 for (type = 0; type < ARRAY_SIZE(line_info); type++)
579 if (namelen == line_info[type].namelen &&
580 !string_enum_compare(line_info[type].name, name, namelen))
581 return &line_info[type];
582
583 return NULL;
584 }
585
586 static void
587 init_colors(void)
588 {
589 int default_bg = COLOR_BLACK;
590 int default_fg = COLOR_WHITE;
591 enum line_type type;
592
593 start_color();
594
595 if (use_default_colors() != ERR) {
596 default_bg = -1;
597 default_fg = -1;
598 }
599
600 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
601 struct line_info *info = &line_info[type];
602 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
603 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
604
605 init_pair(type, fg, bg);
606 }
607 }
608
609 struct line {
610 enum line_type type;
611 void *data; /* User data */
612 };
613
614
615 /*
616 * Keys
617 */
618
619 struct keybinding {
620 int alias;
621 enum request request;
622 };
623
624 static struct keybinding default_keybindings[] = {
625 /* View switching */
626 { 'm', REQ_VIEW_MAIN },
627 { 'd', REQ_VIEW_DIFF },
628 { 'l', REQ_VIEW_LOG },
629 { 'p', REQ_VIEW_PAGER },
630 { 'h', REQ_VIEW_HELP },
631 { '?', REQ_VIEW_HELP },
632
633 /* View manipulation */
634 { 'q', REQ_VIEW_CLOSE },
635 { KEY_TAB, REQ_VIEW_NEXT },
636 { KEY_RETURN, REQ_ENTER },
637 { KEY_UP, REQ_PREVIOUS },
638 { KEY_DOWN, REQ_NEXT },
639
640 /* Cursor navigation */
641 { 'k', REQ_MOVE_UP },
642 { 'j', REQ_MOVE_DOWN },
643 { KEY_HOME, REQ_MOVE_FIRST_LINE },
644 { KEY_END, REQ_MOVE_LAST_LINE },
645 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
646 { ' ', REQ_MOVE_PAGE_DOWN },
647 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
648 { 'b', REQ_MOVE_PAGE_UP },
649 { '-', REQ_MOVE_PAGE_UP },
650
651 /* Scrolling */
652 { KEY_IC, REQ_SCROLL_LINE_UP },
653 { KEY_DC, REQ_SCROLL_LINE_DOWN },
654 { 'w', REQ_SCROLL_PAGE_UP },
655 { 's', REQ_SCROLL_PAGE_DOWN },
656
657 /* Misc */
658 { 'Q', REQ_QUIT },
659 { 'z', REQ_STOP_LOADING },
660 { 'v', REQ_SHOW_VERSION },
661 { 'r', REQ_SCREEN_REDRAW },
662 { 'n', REQ_TOGGLE_LINENO },
663 { 'g', REQ_TOGGLE_REV_GRAPH},
664 { ':', REQ_PROMPT },
665
666 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
667 { ERR, REQ_SCREEN_UPDATE },
668
669 /* Use the ncurses SIGWINCH handler. */
670 { KEY_RESIZE, REQ_SCREEN_RESIZE },
671 };
672
673 static enum request
674 get_keybinding(int key)
675 {
676 int i;
677
678 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
679 if (default_keybindings[i].alias == key)
680 return default_keybindings[i].request;
681
682 return (enum request) key;
683 }
684
685
686 struct key {
687 char *name;
688 int value;
689 };
690
691 static struct key key_table[] = {
692 { "Enter", KEY_RETURN },
693 { "Space", ' ' },
694 { "Backspace", KEY_BACKSPACE },
695 { "Tab", KEY_TAB },
696 { "Escape", KEY_ESC },
697 { "Left", KEY_LEFT },
698 { "Right", KEY_RIGHT },
699 { "Up", KEY_UP },
700 { "Down", KEY_DOWN },
701 { "Insert", KEY_IC },
702 { "Delete", KEY_DC },
703 { "Home", KEY_HOME },
704 { "End", KEY_END },
705 { "PageUp", KEY_PPAGE },
706 { "PageDown", KEY_NPAGE },
707 { "F1", KEY_F(1) },
708 { "F2", KEY_F(2) },
709 { "F3", KEY_F(3) },
710 { "F4", KEY_F(4) },
711 { "F5", KEY_F(5) },
712 { "F6", KEY_F(6) },
713 { "F7", KEY_F(7) },
714 { "F8", KEY_F(8) },
715 { "F9", KEY_F(9) },
716 { "F10", KEY_F(10) },
717 { "F11", KEY_F(11) },
718 { "F12", KEY_F(12) },
719 };
720
721 static char *
722 get_key(enum request request)
723 {
724 static char buf[BUFSIZ];
725 static char key_char[] = "'X'";
726 int pos = 0;
727 char *sep = " ";
728 int i;
729
730 buf[pos] = 0;
731
732 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
733 struct keybinding *keybinding = &default_keybindings[i];
734 char *seq = NULL;
735 int key;
736
737 if (keybinding->request != request)
738 continue;
739
740 for (key = 0; key < ARRAY_SIZE(key_table); key++)
741 if (key_table[key].value == keybinding->alias)
742 seq = key_table[key].name;
743
744 if (seq == NULL &&
745 keybinding->alias < 127 &&
746 isprint(keybinding->alias)) {
747 key_char[1] = (char) keybinding->alias;
748 seq = key_char;
749 }
750
751 if (!seq)
752 seq = "'?'";
753
754 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
755 return "Too many keybindings!";
756 sep = ", ";
757 }
758
759 return buf;
760 }
761
762
763 /*
764 * User config file handling.
765 */
766
767 static struct int_map color_map[] = {
768 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
769 COLOR_MAP(DEFAULT),
770 COLOR_MAP(BLACK),
771 COLOR_MAP(BLUE),
772 COLOR_MAP(CYAN),
773 COLOR_MAP(GREEN),
774 COLOR_MAP(MAGENTA),
775 COLOR_MAP(RED),
776 COLOR_MAP(WHITE),
777 COLOR_MAP(YELLOW),
778 };
779
780 #define set_color(color, name) \
781 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
782
783 static struct int_map attr_map[] = {
784 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
785 ATTR_MAP(NORMAL),
786 ATTR_MAP(BLINK),
787 ATTR_MAP(BOLD),
788 ATTR_MAP(DIM),
789 ATTR_MAP(REVERSE),
790 ATTR_MAP(STANDOUT),
791 ATTR_MAP(UNDERLINE),
792 };
793
794 #define set_attribute(attr, name) \
795 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
796
797 static int config_lineno;
798 static bool config_errors;
799 static char *config_msg;
800
801 /* Wants: object fgcolor bgcolor [attr] */
802 static int
803 option_color_command(int argc, char *argv[])
804 {
805 struct line_info *info;
806
807 if (argc != 3 && argc != 4) {
808 config_msg = "Wrong number of arguments given to color command";
809 return ERR;
810 }
811
812 info = get_line_info(argv[0], strlen(argv[0]));
813 if (!info) {
814 config_msg = "Unknown color name";
815 return ERR;
816 }
817
818 if (set_color(&info->fg, argv[1]) == ERR) {
819 config_msg = "Unknown color";
820 return ERR;
821 }
822
823 if (set_color(&info->bg, argv[2]) == ERR) {
824 config_msg = "Unknown color";
825 return ERR;
826 }
827
828 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
829 config_msg = "Unknown attribute";
830 return ERR;
831 }
832
833 return OK;
834 }
835
836 /* Wants: name = value */
837 static int
838 option_set_command(int argc, char *argv[])
839 {
840 if (argc != 3) {
841 config_msg = "Wrong number of arguments given to set command";
842 return ERR;
843 }
844
845 if (strcmp(argv[1], "=")) {
846 config_msg = "No value assigned";
847 return ERR;
848 }
849
850 if (!strcmp(argv[0], "show-rev-graph")) {
851 opt_rev_graph = (!strcmp(argv[2], "1") ||
852 !strcmp(argv[2], "true") ||
853 !strcmp(argv[2], "yes"));
854 return OK;
855 }
856
857 if (!strcmp(argv[0], "line-number-interval")) {
858 opt_num_interval = atoi(argv[2]);
859 return OK;
860 }
861
862 if (!strcmp(argv[0], "tab-size")) {
863 opt_tab_size = atoi(argv[2]);
864 return OK;
865 }
866
867 if (!strcmp(argv[0], "encoding")) {
868 string_copy(opt_encoding, argv[2]);
869 return OK;
870 }
871
872 return ERR;
873 }
874
875 static int
876 set_option(char *opt, char *value)
877 {
878 char *argv[16];
879 int valuelen;
880 int argc = 0;
881
882 /* Tokenize */
883 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
884 argv[argc++] = value;
885
886 value += valuelen;
887 if (!*value)
888 break;
889
890 *value++ = 0;
891 while (isspace(*value))
892 value++;
893 }
894
895 if (!strcmp(opt, "color"))
896 return option_color_command(argc, argv);
897
898 if (!strcmp(opt, "set"))
899 return option_set_command(argc, argv);
900
901 return ERR;
902 }
903
904 static int
905 read_option(char *opt, int optlen, char *value, int valuelen)
906 {
907 config_lineno++;
908 config_msg = "Internal error";
909
910 optlen = strcspn(opt, "#;");
911 if (optlen == 0) {
912 /* The whole line is a commend or empty. */
913 return OK;
914
915 } else if (opt[optlen] != 0) {
916 /* Part of the option name is a comment, so the value part
917 * should be ignored. */
918 valuelen = 0;
919 opt[optlen] = value[valuelen] = 0;
920 } else {
921 /* Else look for comment endings in the value. */
922 valuelen = strcspn(value, "#;");
923 value[valuelen] = 0;
924 }
925
926 if (set_option(opt, value) == ERR) {
927 fprintf(stderr, "Error on line %d, near '%.*s' option: %s\n",
928 config_lineno, optlen, opt, config_msg);
929 config_errors = TRUE;
930 }
931
932 /* Always keep going if errors are encountered. */
933 return OK;
934 }
935
936 static int
937 load_options(void)
938 {
939 char *home = getenv("HOME");
940 char buf[1024];
941 FILE *file;
942
943 config_lineno = 0;
944 config_errors = FALSE;
945
946 if (!home || !string_format(buf, "%s/.tigrc", home))
947 return ERR;
948
949 /* It's ok that the file doesn't exist. */
950 file = fopen(buf, "r");
951 if (!file)
952 return OK;
953
954 if (read_properties(file, " \t", read_option) == ERR ||
955 config_errors == TRUE)
956 fprintf(stderr, "Errors while loading %s.\n", buf);
957
958 return OK;
959 }
960
961
962 /*
963 * The viewer
964 */
965
966 struct view;
967 struct view_ops;
968
969 /* The display array of active views and the index of the current view. */
970 static struct view *display[2];
971 static unsigned int current_view;
972
973 #define foreach_view(view, i) \
974 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
975
976 #define displayed_views() (display[1] != NULL ? 2 : 1)
977
978 /* Current head and commit ID */
979 static char ref_commit[SIZEOF_REF] = "HEAD";
980 static char ref_head[SIZEOF_REF] = "HEAD";
981
982 struct view {
983 const char *name; /* View name */
984 const char *cmd_fmt; /* Default command line format */
985 const char *cmd_env; /* Command line set via environment */
986 const char *id; /* Points to either of ref_{head,commit} */
987
988 struct view_ops *ops; /* View operations */
989
990 char cmd[SIZEOF_CMD]; /* Command buffer */
991 char ref[SIZEOF_REF]; /* Hovered commit reference */
992 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
993
994 int height, width; /* The width and height of the main window */
995 WINDOW *win; /* The main window */
996 WINDOW *title; /* The title window living below the main window */
997
998 /* Navigation */
999 unsigned long offset; /* Offset of the window top */
1000 unsigned long lineno; /* Current line number */
1001
1002 /* If non-NULL, points to the view that opened this view. If this view
1003 * is closed tig will switch back to the parent view. */
1004 struct view *parent;
1005
1006 /* Buffering */
1007 unsigned long lines; /* Total number of lines */
1008 struct line *line; /* Line index */
1009 unsigned long line_size;/* Total number of allocated lines */
1010 unsigned int digits; /* Number of digits in the lines member. */
1011
1012 /* Loading */
1013 FILE *pipe;
1014 time_t start_time;
1015 };
1016
1017 struct view_ops {
1018 /* What type of content being displayed. Used in the title bar. */
1019 const char *type;
1020 /* Draw one line; @lineno must be < view->height. */
1021 bool (*draw)(struct view *view, struct line *line, unsigned int lineno);
1022 /* Read one line; updates view->line. */
1023 bool (*read)(struct view *view, char *data);
1024 /* Depending on view, change display based on current line. */
1025 bool (*enter)(struct view *view, struct line *line);
1026 };
1027
1028 static struct view_ops pager_ops;
1029 static struct view_ops main_ops;
1030
1031 #define VIEW_STR(name, cmd, env, ref, ops) \
1032 { name, cmd, #env, ref, ops }
1033
1034 #define VIEW_(id, name, ops, ref) \
1035 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops)
1036
1037
1038 static struct view views[] = {
1039 VIEW_(MAIN, "main", &main_ops, ref_head),
1040 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1041 VIEW_(LOG, "log", &pager_ops, ref_head),
1042 VIEW_(HELP, "help", &pager_ops, "static"),
1043 VIEW_(PAGER, "pager", &pager_ops, "static"),
1044 };
1045
1046 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1047
1048
1049 static bool
1050 draw_view_line(struct view *view, unsigned int lineno)
1051 {
1052 if (view->offset + lineno >= view->lines)
1053 return FALSE;
1054
1055 return view->ops->draw(view, &view->line[view->offset + lineno], lineno);
1056 }
1057
1058 static void
1059 redraw_view_from(struct view *view, int lineno)
1060 {
1061 assert(0 <= lineno && lineno < view->height);
1062
1063 for (; lineno < view->height; lineno++) {
1064 if (!draw_view_line(view, lineno))
1065 break;
1066 }
1067
1068 redrawwin(view->win);
1069 wrefresh(view->win);
1070 }
1071
1072 static void
1073 redraw_view(struct view *view)
1074 {
1075 wclear(view->win);
1076 redraw_view_from(view, 0);
1077 }
1078
1079
1080 static void
1081 update_view_title(struct view *view)
1082 {
1083 if (view == display[current_view])
1084 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1085 else
1086 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1087
1088 werase(view->title);
1089 wmove(view->title, 0, 0);
1090
1091 if (*view->ref)
1092 wprintw(view->title, "[%s] %s", view->name, view->ref);
1093 else
1094 wprintw(view->title, "[%s]", view->name);
1095
1096 if (view->lines || view->pipe) {
1097 unsigned int view_lines = view->offset + view->height;
1098 unsigned int lines = view->lines
1099 ? MIN(view_lines, view->lines) * 100 / view->lines
1100 : 0;
1101
1102 wprintw(view->title, " - %s %d of %d (%d%%)",
1103 view->ops->type,
1104 view->lineno + 1,
1105 view->lines,
1106 lines);
1107 }
1108
1109 if (view->pipe) {
1110 time_t secs = time(NULL) - view->start_time;
1111
1112 /* Three git seconds are a long time ... */
1113 if (secs > 2)
1114 wprintw(view->title, " %lds", secs);
1115 }
1116
1117 wmove(view->title, 0, view->width - 1);
1118 wrefresh(view->title);
1119 }
1120
1121 static void
1122 resize_display(void)
1123 {
1124 int offset, i;
1125 struct view *base = display[0];
1126 struct view *view = display[1] ? display[1] : display[0];
1127
1128 /* Setup window dimensions */
1129
1130 getmaxyx(stdscr, base->height, base->width);
1131
1132 /* Make room for the status window. */
1133 base->height -= 1;
1134
1135 if (view != base) {
1136 /* Horizontal split. */
1137 view->width = base->width;
1138 view->height = SCALE_SPLIT_VIEW(base->height);
1139 base->height -= view->height;
1140
1141 /* Make room for the title bar. */
1142 view->height -= 1;
1143 }
1144
1145 /* Make room for the title bar. */
1146 base->height -= 1;
1147
1148 offset = 0;
1149
1150 foreach_view (view, i) {
1151 if (!view->win) {
1152 view->win = newwin(view->height, 0, offset, 0);
1153 if (!view->win)
1154 die("Failed to create %s view", view->name);
1155
1156 scrollok(view->win, TRUE);
1157
1158 view->title = newwin(1, 0, offset + view->height, 0);
1159 if (!view->title)
1160 die("Failed to create title window");
1161
1162 } else {
1163 wresize(view->win, view->height, view->width);
1164 mvwin(view->win, offset, 0);
1165 mvwin(view->title, offset + view->height, 0);
1166 }
1167
1168 offset += view->height + 1;
1169 }
1170 }
1171
1172 static void
1173 redraw_display(void)
1174 {
1175 struct view *view;
1176 int i;
1177
1178 foreach_view (view, i) {
1179 redraw_view(view);
1180 update_view_title(view);
1181 }
1182 }
1183
1184 static void
1185 update_display_cursor(void)
1186 {
1187 struct view *view = display[current_view];
1188
1189 /* Move the cursor to the right-most column of the cursor line.
1190 *
1191 * XXX: This could turn out to be a bit expensive, but it ensures that
1192 * the cursor does not jump around. */
1193 if (view->lines) {
1194 wmove(view->win, view->lineno - view->offset, view->width - 1);
1195 wrefresh(view->win);
1196 }
1197 }
1198
1199 /*
1200 * Navigation
1201 */
1202
1203 /* Scrolling backend */
1204 static void
1205 do_scroll_view(struct view *view, int lines, bool redraw)
1206 {
1207 /* The rendering expects the new offset. */
1208 view->offset += lines;
1209
1210 assert(0 <= view->offset && view->offset < view->lines);
1211 assert(lines);
1212
1213 /* Redraw the whole screen if scrolling is pointless. */
1214 if (view->height < ABS(lines)) {
1215 redraw_view(view);
1216
1217 } else {
1218 int line = lines > 0 ? view->height - lines : 0;
1219 int end = line + ABS(lines);
1220
1221 wscrl(view->win, lines);
1222
1223 for (; line < end; line++) {
1224 if (!draw_view_line(view, line))
1225 break;
1226 }
1227 }
1228
1229 /* Move current line into the view. */
1230 if (view->lineno < view->offset) {
1231 view->lineno = view->offset;
1232 draw_view_line(view, 0);
1233
1234 } else if (view->lineno >= view->offset + view->height) {
1235 if (view->lineno == view->offset + view->height) {
1236 /* Clear the hidden line so it doesn't show if the view
1237 * is scrolled up. */
1238 wmove(view->win, view->height, 0);
1239 wclrtoeol(view->win);
1240 }
1241 view->lineno = view->offset + view->height - 1;
1242 draw_view_line(view, view->lineno - view->offset);
1243 }
1244
1245 assert(view->offset <= view->lineno && view->lineno < view->lines);
1246
1247 if (!redraw)
1248 return;
1249
1250 redrawwin(view->win);
1251 wrefresh(view->win);
1252 report("");
1253 }
1254
1255 /* Scroll frontend */
1256 static void
1257 scroll_view(struct view *view, enum request request)
1258 {
1259 int lines = 1;
1260
1261 switch (request) {
1262 case REQ_SCROLL_PAGE_DOWN:
1263 lines = view->height;
1264 case REQ_SCROLL_LINE_DOWN:
1265 if (view->offset + lines > view->lines)
1266 lines = view->lines - view->offset;
1267
1268 if (lines == 0 || view->offset + view->height >= view->lines) {
1269 report("Cannot scroll beyond the last line");
1270 return;
1271 }
1272 break;
1273
1274 case REQ_SCROLL_PAGE_UP:
1275 lines = view->height;
1276 case REQ_SCROLL_LINE_UP:
1277 if (lines > view->offset)
1278 lines = view->offset;
1279
1280 if (lines == 0) {
1281 report("Cannot scroll beyond the first line");
1282 return;
1283 }
1284
1285 lines = -lines;
1286 break;
1287
1288 default:
1289 die("request %d not handled in switch", request);
1290 }
1291
1292 do_scroll_view(view, lines, TRUE);
1293 }
1294
1295 /* Cursor moving */
1296 static void
1297 move_view(struct view *view, enum request request, bool redraw)
1298 {
1299 int steps;
1300
1301 switch (request) {
1302 case REQ_MOVE_FIRST_LINE:
1303 steps = -view->lineno;
1304 break;
1305
1306 case REQ_MOVE_LAST_LINE:
1307 steps = view->lines - view->lineno - 1;
1308 break;
1309
1310 case REQ_MOVE_PAGE_UP:
1311 steps = view->height > view->lineno
1312 ? -view->lineno : -view->height;
1313 break;
1314
1315 case REQ_MOVE_PAGE_DOWN:
1316 steps = view->lineno + view->height >= view->lines
1317 ? view->lines - view->lineno - 1 : view->height;
1318 break;
1319
1320 case REQ_MOVE_UP:
1321 steps = -1;
1322 break;
1323
1324 case REQ_MOVE_DOWN:
1325 steps = 1;
1326 break;
1327
1328 default:
1329 die("request %d not handled in switch", request);
1330 }
1331
1332 if (steps <= 0 && view->lineno == 0) {
1333 report("Cannot move beyond the first line");
1334 return;
1335
1336 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1337 report("Cannot move beyond the last line");
1338 return;
1339 }
1340
1341 /* Move the current line */
1342 view->lineno += steps;
1343 assert(0 <= view->lineno && view->lineno < view->lines);
1344
1345 /* Repaint the old "current" line if we be scrolling */
1346 if (ABS(steps) < view->height) {
1347 int prev_lineno = view->lineno - steps - view->offset;
1348
1349 wmove(view->win, prev_lineno, 0);
1350 wclrtoeol(view->win);
1351 draw_view_line(view, prev_lineno);
1352 }
1353
1354 /* Check whether the view needs to be scrolled */
1355 if (view->lineno < view->offset ||
1356 view->lineno >= view->offset + view->height) {
1357 if (steps < 0 && -steps > view->offset) {
1358 steps = -view->offset;
1359
1360 } else if (steps > 0) {
1361 if (view->lineno == view->lines - 1 &&
1362 view->lines > view->height) {
1363 steps = view->lines - view->offset - 1;
1364 if (steps >= view->height)
1365 steps -= view->height - 1;
1366 }
1367 }
1368
1369 do_scroll_view(view, steps, redraw);
1370 return;
1371 }
1372
1373 /* Draw the current line */
1374 draw_view_line(view, view->lineno - view->offset);
1375
1376 if (!redraw)
1377 return;
1378
1379 redrawwin(view->win);
1380 wrefresh(view->win);
1381 report("");
1382 }
1383
1384
1385 /*
1386 * Incremental updating
1387 */
1388
1389 static void
1390 end_update(struct view *view)
1391 {
1392 if (!view->pipe)
1393 return;
1394 set_nonblocking_input(FALSE);
1395 if (view->pipe == stdin)
1396 fclose(view->pipe);
1397 else
1398 pclose(view->pipe);
1399 view->pipe = NULL;
1400 }
1401
1402 static bool
1403 begin_update(struct view *view)
1404 {
1405 const char *id = view->id;
1406
1407 if (view->pipe)
1408 end_update(view);
1409
1410 if (opt_cmd[0]) {
1411 string_copy(view->cmd, opt_cmd);
1412 opt_cmd[0] = 0;
1413 /* When running random commands, the view ref could have become
1414 * invalid so clear it. */
1415 view->ref[0] = 0;
1416 } else {
1417 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1418
1419 if (!string_format(view->cmd, format, id, id, id, id, id))
1420 return FALSE;
1421 }
1422
1423 /* Special case for the pager view. */
1424 if (opt_pipe) {
1425 view->pipe = opt_pipe;
1426 opt_pipe = NULL;
1427 } else {
1428 view->pipe = popen(view->cmd, "r");
1429 }
1430
1431 if (!view->pipe)
1432 return FALSE;
1433
1434 set_nonblocking_input(TRUE);
1435
1436 view->offset = 0;
1437 view->lines = 0;
1438 view->lineno = 0;
1439 string_copy(view->vid, id);
1440
1441 if (view->line) {
1442 int i;
1443
1444 for (i = 0; i < view->lines; i++)
1445 if (view->line[i].data)
1446 free(view->line[i].data);
1447
1448 free(view->line);
1449 view->line = NULL;
1450 }
1451
1452 view->start_time = time(NULL);
1453
1454 return TRUE;
1455 }
1456
1457 static struct line *
1458 realloc_lines(struct view *view, size_t line_size)
1459 {
1460 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1461
1462 if (!tmp)
1463 return NULL;
1464
1465 view->line = tmp;
1466 view->line_size = line_size;
1467 return view->line;
1468 }
1469
1470 static bool
1471 update_view(struct view *view)
1472 {
1473 char buffer[BUFSIZ];
1474 char *line;
1475 /* The number of lines to read. If too low it will cause too much
1476 * redrawing (and possible flickering), if too high responsiveness
1477 * will suffer. */
1478 unsigned long lines = view->height;
1479 int redraw_from = -1;
1480
1481 if (!view->pipe)
1482 return TRUE;
1483
1484 /* Only redraw if lines are visible. */
1485 if (view->offset + view->height >= view->lines)
1486 redraw_from = view->lines - view->offset;
1487
1488 if (!realloc_lines(view, view->lines + lines))
1489 goto alloc_error;
1490
1491 while ((line = fgets(buffer, sizeof(buffer), view->pipe))) {
1492 int linelen = strlen(line);
1493
1494 if (linelen)
1495 line[linelen - 1] = 0;
1496
1497 if (!view->ops->read(view, line))
1498 goto alloc_error;
1499
1500 if (lines-- == 1)
1501 break;
1502 }
1503
1504 {
1505 int digits;
1506
1507 lines = view->lines;
1508 for (digits = 0; lines; digits++)
1509 lines /= 10;
1510
1511 /* Keep the displayed view in sync with line number scaling. */
1512 if (digits != view->digits) {
1513 view->digits = digits;
1514 redraw_from = 0;
1515 }
1516 }
1517
1518 if (redraw_from >= 0) {
1519 /* If this is an incremental update, redraw the previous line
1520 * since for commits some members could have changed when
1521 * loading the main view. */
1522 if (redraw_from > 0)
1523 redraw_from--;
1524
1525 /* Incrementally draw avoids flickering. */
1526 redraw_view_from(view, redraw_from);
1527 }
1528
1529 /* Update the title _after_ the redraw so that if the redraw picks up a
1530 * commit reference in view->ref it'll be available here. */
1531 update_view_title(view);
1532
1533 if (ferror(view->pipe)) {
1534 report("Failed to read: %s", strerror(errno));
1535 goto end;
1536
1537 } else if (feof(view->pipe)) {
1538 report("");
1539 goto end;
1540 }
1541
1542 return TRUE;
1543
1544 alloc_error:
1545 report("Allocation failure");
1546
1547 end:
1548 end_update(view);
1549 return FALSE;
1550 }
1551
1552
1553 /*
1554 * View opening
1555 */
1556
1557 static void open_help_view(struct view *view)
1558 {
1559 char buf[BUFSIZ];
1560 int lines = ARRAY_SIZE(req_info) + 2;
1561 int i;
1562
1563 if (view->lines > 0)
1564 return;
1565
1566 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1567 if (!req_info[i].request)
1568 lines++;
1569
1570 view->line = calloc(lines, sizeof(*view->line));
1571 if (!view->line) {
1572 report("Allocation failure");
1573 return;
1574 }
1575
1576 view->ops->read(view, "Quick reference for tig keybindings:");
1577
1578 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1579 char *key;
1580
1581 if (!req_info[i].request) {
1582 view->ops->read(view, "");
1583 view->ops->read(view, req_info[i].help);
1584 continue;
1585 }
1586
1587 key = get_key(req_info[i].request);
1588 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1589 continue;
1590
1591 view->ops->read(view, buf);
1592 }
1593 }
1594
1595 enum open_flags {
1596 OPEN_DEFAULT = 0, /* Use default view switching. */
1597 OPEN_SPLIT = 1, /* Split current view. */
1598 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1599 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1600 };
1601
1602 static void
1603 open_view(struct view *prev, enum request request, enum open_flags flags)
1604 {
1605 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1606 bool split = !!(flags & OPEN_SPLIT);
1607 bool reload = !!(flags & OPEN_RELOAD);
1608 struct view *view = VIEW(request);
1609 int nviews = displayed_views();
1610 struct view *base_view = display[0];
1611
1612 if (view == prev && nviews == 1 && !reload) {
1613 report("Already in %s view", view->name);
1614 return;
1615 }
1616
1617 if (view == VIEW(REQ_VIEW_HELP)) {
1618 open_help_view(view);
1619
1620 } else if ((reload || strcmp(view->vid, view->id)) &&
1621 !begin_update(view)) {
1622 report("Failed to load %s view", view->name);
1623 return;
1624 }
1625
1626 if (split) {
1627 display[1] = view;
1628 if (!backgrounded)
1629 current_view = 1;
1630 } else {
1631 /* Maximize the current view. */
1632 memset(display, 0, sizeof(display));
1633 current_view = 0;
1634 display[current_view] = view;
1635 }
1636
1637 /* Resize the view when switching between split- and full-screen,
1638 * or when switching between two different full-screen views. */
1639 if (nviews != displayed_views() ||
1640 (nviews == 1 && base_view != display[0]))
1641 resize_display();
1642
1643 if (split && prev->lineno - prev->offset >= prev->height) {
1644 /* Take the title line into account. */
1645 int lines = prev->lineno - prev->offset - prev->height + 1;
1646
1647 /* Scroll the view that was split if the current line is
1648 * outside the new limited view. */
1649 do_scroll_view(prev, lines, TRUE);
1650 }
1651
1652 if (prev && view != prev) {
1653 if (split && !backgrounded) {
1654 /* "Blur" the previous view. */
1655 update_view_title(prev);
1656 }
1657
1658 view->parent = prev;
1659 }
1660
1661 if (view->pipe && view->lines == 0) {
1662 /* Clear the old view and let the incremental updating refill
1663 * the screen. */
1664 wclear(view->win);
1665 report("");
1666 } else {
1667 redraw_view(view);
1668 report("");
1669 }
1670
1671 /* If the view is backgrounded the above calls to report()
1672 * won't redraw the view title. */
1673 if (backgrounded)
1674 update_view_title(view);
1675 }
1676
1677
1678 /*
1679 * User request switch noodle
1680 */
1681
1682 static int
1683 view_driver(struct view *view, enum request request)
1684 {
1685 int i;
1686
1687 switch (request) {
1688 case REQ_MOVE_UP:
1689 case REQ_MOVE_DOWN:
1690 case REQ_MOVE_PAGE_UP:
1691 case REQ_MOVE_PAGE_DOWN:
1692 case REQ_MOVE_FIRST_LINE:
1693 case REQ_MOVE_LAST_LINE:
1694 move_view(view, request, TRUE);
1695 break;
1696
1697 case REQ_SCROLL_LINE_DOWN:
1698 case REQ_SCROLL_LINE_UP:
1699 case REQ_SCROLL_PAGE_DOWN:
1700 case REQ_SCROLL_PAGE_UP:
1701 scroll_view(view, request);
1702 break;
1703
1704 case REQ_VIEW_MAIN:
1705 case REQ_VIEW_DIFF:
1706 case REQ_VIEW_LOG:
1707 case REQ_VIEW_HELP:
1708 case REQ_VIEW_PAGER:
1709 open_view(view, request, OPEN_DEFAULT);
1710 break;
1711
1712 case REQ_NEXT:
1713 case REQ_PREVIOUS:
1714 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
1715
1716 if (view == VIEW(REQ_VIEW_DIFF) &&
1717 view->parent == VIEW(REQ_VIEW_MAIN)) {
1718 bool redraw = display[1] == view;
1719
1720 view = view->parent;
1721 move_view(view, request, redraw);
1722 if (redraw)
1723 update_view_title(view);
1724 } else {
1725 move_view(view, request, TRUE);
1726 break;
1727 }
1728 /* Fall-through */
1729
1730 case REQ_ENTER:
1731 if (!view->lines) {
1732 report("Nothing to enter");
1733 break;
1734 }
1735 return view->ops->enter(view, &view->line[view->lineno]);
1736
1737 case REQ_VIEW_NEXT:
1738 {
1739 int nviews = displayed_views();
1740 int next_view = (current_view + 1) % nviews;
1741
1742 if (next_view == current_view) {
1743 report("Only one view is displayed");
1744 break;
1745 }
1746
1747 current_view = next_view;
1748 /* Blur out the title of the previous view. */
1749 update_view_title(view);
1750 report("");
1751 break;
1752 }
1753 case REQ_TOGGLE_LINENO:
1754 opt_line_number = !opt_line_number;
1755 redraw_display();
1756 break;
1757
1758 case REQ_TOGGLE_REV_GRAPH:
1759 opt_rev_graph = !opt_rev_graph;
1760 redraw_display();
1761 break;
1762
1763 case REQ_PROMPT:
1764 /* Always reload^Wrerun commands from the prompt. */
1765 open_view(view, opt_request, OPEN_RELOAD);
1766 break;
1767
1768 case REQ_STOP_LOADING:
1769 for (i = 0; i < ARRAY_SIZE(views); i++) {
1770 view = &views[i];
1771 if (view->pipe)
1772 report("Stopped loading the %s view", view->name),
1773 end_update(view);
1774 }
1775 break;
1776
1777 case REQ_SHOW_VERSION:
1778 report("%s (built %s)", VERSION, __DATE__);
1779 return TRUE;
1780
1781 case REQ_SCREEN_RESIZE:
1782 resize_display();
1783 /* Fall-through */
1784 case REQ_SCREEN_REDRAW:
1785 redraw_display();
1786 break;
1787
1788 case REQ_SCREEN_UPDATE:
1789 doupdate();
1790 return TRUE;
1791
1792 case REQ_VIEW_CLOSE:
1793 /* XXX: Mark closed views by letting view->parent point to the
1794 * view itself. Parents to closed view should never be
1795 * followed. */
1796 if (view->parent &&
1797 view->parent->parent != view->parent) {
1798 memset(display, 0, sizeof(display));
1799 current_view = 0;
1800 display[current_view] = view->parent;
1801 view->parent = view;
1802 resize_display();
1803 redraw_display();
1804 break;
1805 }
1806 /* Fall-through */
1807 case REQ_QUIT:
1808 return FALSE;
1809
1810 default:
1811 /* An unknown key will show most commonly used commands. */
1812 report("Unknown key, press 'h' for help");
1813 return TRUE;
1814 }
1815
1816 return TRUE;
1817 }
1818
1819
1820 /*
1821 * Pager backend
1822 */
1823
1824 static bool
1825 pager_draw(struct view *view, struct line *line, unsigned int lineno)
1826 {
1827 char *text = line->data;
1828 enum line_type type = line->type;
1829 int textlen = strlen(text);
1830 int attr;
1831
1832 wmove(view->win, lineno, 0);
1833
1834 if (view->offset + lineno == view->lineno) {
1835 if (type == LINE_COMMIT) {
1836 string_copy(view->ref, text + 7);
1837 string_copy(ref_commit, view->ref);
1838 }
1839
1840 type = LINE_CURSOR;
1841 wchgat(view->win, -1, 0, type, NULL);
1842 }
1843
1844 attr = get_line_attr(type);
1845 wattrset(view->win, attr);
1846
1847 if (opt_line_number || opt_tab_size < TABSIZE) {
1848 static char spaces[] = " ";
1849 int col_offset = 0, col = 0;
1850
1851 if (opt_line_number) {
1852 unsigned long real_lineno = view->offset + lineno + 1;
1853
1854 if (real_lineno == 1 ||
1855 (real_lineno % opt_num_interval) == 0) {
1856 wprintw(view->win, "%.*d", view->digits, real_lineno);
1857
1858 } else {
1859 waddnstr(view->win, spaces,
1860 MIN(view->digits, STRING_SIZE(spaces)));
1861 }
1862 waddstr(view->win, ": ");
1863 col_offset = view->digits + 2;
1864 }
1865
1866 while (text && col_offset + col < view->width) {
1867 int cols_max = view->width - col_offset - col;
1868 char *pos = text;
1869 int cols;
1870
1871 if (*text == '\t') {
1872 text++;
1873 assert(sizeof(spaces) > TABSIZE);
1874 pos = spaces;
1875 cols = opt_tab_size - (col % opt_tab_size);
1876
1877 } else {
1878 text = strchr(text, '\t');
1879 cols = line ? text - pos : strlen(pos);
1880 }
1881
1882 waddnstr(view->win, pos, MIN(cols, cols_max));
1883 col += cols;
1884 }
1885
1886 } else {
1887 int col = 0, pos = 0;
1888
1889 for (; pos < textlen && col < view->width; pos++, col++)
1890 if (text[pos] == '\t')
1891 col += TABSIZE - (col % TABSIZE) - 1;
1892
1893 waddnstr(view->win, text, pos);
1894 }
1895
1896 return TRUE;
1897 }
1898
1899 static void
1900 add_pager_refs(struct view *view, struct line *line)
1901 {
1902 char buf[1024];
1903 char *data = line->data;
1904 struct ref **refs;
1905 int bufpos = 0, refpos = 0;
1906 const char *sep = "Refs: ";
1907
1908 assert(line->type == LINE_COMMIT);
1909
1910 refs = get_refs(data + STRING_SIZE("commit "));
1911 if (!refs)
1912 return;
1913
1914 do {
1915 struct ref *ref = refs[refpos];
1916 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
1917
1918 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
1919 return;
1920 sep = ", ";
1921 } while (refs[refpos++]->next);
1922
1923 if (!realloc_lines(view, view->line_size + 1))
1924 return;
1925
1926 line = &view->line[view->lines];
1927 line->data = strdup(buf);
1928 if (!line->data)
1929 return;
1930
1931 line->type = LINE_PP_REFS;
1932 view->lines++;
1933 }
1934
1935 static bool
1936 pager_read(struct view *view, char *data)
1937 {
1938 struct line *line = &view->line[view->lines];
1939
1940 line->data = strdup(data);
1941 if (!line->data)
1942 return FALSE;
1943
1944 line->type = get_line_type(line->data);
1945 view->lines++;
1946
1947 if (line->type == LINE_COMMIT &&
1948 (view == VIEW(REQ_VIEW_DIFF) ||
1949 view == VIEW(REQ_VIEW_LOG)))
1950 add_pager_refs(view, line);
1951
1952 return TRUE;
1953 }
1954
1955 static bool
1956 pager_enter(struct view *view, struct line *line)
1957 {
1958 int split = 0;
1959
1960 if (line->type == LINE_COMMIT &&
1961 (view == VIEW(REQ_VIEW_LOG) ||
1962 view == VIEW(REQ_VIEW_PAGER))) {
1963 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
1964 split = 1;
1965 }
1966
1967 /* Always scroll the view even if it was split. That way
1968 * you can use Enter to scroll through the log view and
1969 * split open each commit diff. */
1970 scroll_view(view, REQ_SCROLL_LINE_DOWN);
1971
1972 /* FIXME: A minor workaround. Scrolling the view will call report("")
1973 * but if we are scrolling a non-current view this won't properly
1974 * update the view title. */
1975 if (split)
1976 update_view_title(view);
1977
1978 return TRUE;
1979 }
1980
1981 static struct view_ops pager_ops = {
1982 "line",
1983 pager_draw,
1984 pager_read,
1985 pager_enter,
1986 };
1987
1988
1989 /*
1990 * Main view backend
1991 */
1992
1993 struct commit {
1994 char id[41]; /* SHA1 ID. */
1995 char title[75]; /* First line of the commit message. */
1996 char author[75]; /* Author of the commit. */
1997 struct tm time; /* Date from the author ident. */
1998 struct ref **refs; /* Repository references. */
1999 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2000 size_t graph_size; /* The width of the graph array. */
2001 };
2002
2003 static bool
2004 main_draw(struct view *view, struct line *line, unsigned int lineno)
2005 {
2006 char buf[DATE_COLS + 1];
2007 struct commit *commit = line->data;
2008 enum line_type type;
2009 int col = 0;
2010 size_t timelen;
2011 size_t authorlen;
2012 int trimmed = 1;
2013
2014 if (!*commit->author)
2015 return FALSE;
2016
2017 wmove(view->win, lineno, col);
2018
2019 if (view->offset + lineno == view->lineno) {
2020 string_copy(view->ref, commit->id);
2021 string_copy(ref_commit, view->ref);
2022 type = LINE_CURSOR;
2023 wattrset(view->win, get_line_attr(type));
2024 wchgat(view->win, -1, 0, type, NULL);
2025
2026 } else {
2027 type = LINE_MAIN_COMMIT;
2028 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2029 }
2030
2031 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2032 waddnstr(view->win, buf, timelen);
2033 waddstr(view->win, " ");
2034
2035 col += DATE_COLS;
2036 wmove(view->win, lineno, col);
2037 if (type != LINE_CURSOR)
2038 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2039
2040 if (opt_utf8) {
2041 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2042 } else {
2043 authorlen = strlen(commit->author);
2044 if (authorlen > AUTHOR_COLS - 2) {
2045 authorlen = AUTHOR_COLS - 2;
2046 trimmed = 1;
2047 }
2048 }
2049
2050 if (trimmed) {
2051 waddnstr(view->win, commit->author, authorlen);
2052 if (type != LINE_CURSOR)
2053 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2054 waddch(view->win, '~');
2055 } else {
2056 waddstr(view->win, commit->author);
2057 }
2058
2059 col += AUTHOR_COLS;
2060 if (type != LINE_CURSOR)
2061 wattrset(view->win, A_NORMAL);
2062
2063 if (opt_rev_graph && commit->graph_size) {
2064 size_t i;
2065
2066 wmove(view->win, lineno, col);
2067 /* Using waddch() instead of waddnstr() ensures that
2068 * they'll be rendered correctly for the cursor line. */
2069 for (i = 0; i < commit->graph_size; i++)
2070 waddch(view->win, commit->graph[i]);
2071
2072 col += commit->graph_size + 1;
2073 }
2074
2075 wmove(view->win, lineno, col);
2076
2077 if (commit->refs) {
2078 size_t i = 0;
2079
2080 do {
2081 if (type == LINE_CURSOR)
2082 ;
2083 else if (commit->refs[i]->tag)
2084 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2085 else
2086 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2087 waddstr(view->win, "[");
2088 waddstr(view->win, commit->refs[i]->name);
2089 waddstr(view->win, "]");
2090 if (type != LINE_CURSOR)
2091 wattrset(view->win, A_NORMAL);
2092 waddstr(view->win, " ");
2093 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2094 } while (commit->refs[i++]->next);
2095 }
2096
2097 if (type != LINE_CURSOR)
2098 wattrset(view->win, get_line_attr(type));
2099
2100 {
2101 int titlelen = strlen(commit->title);
2102
2103 if (col + titlelen > view->width)
2104 titlelen = view->width - col;
2105
2106 waddnstr(view->win, commit->title, titlelen);
2107 }
2108
2109 return TRUE;
2110 }
2111
2112 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2113 static bool
2114 main_read(struct view *view, char *line)
2115 {
2116 enum line_type type = get_line_type(line);
2117 struct commit *commit = view->lines
2118 ? view->line[view->lines - 1].data : NULL;
2119
2120 switch (type) {
2121 case LINE_COMMIT:
2122 commit = calloc(1, sizeof(struct commit));
2123 if (!commit)
2124 return FALSE;
2125
2126 line += STRING_SIZE("commit ");
2127
2128 view->line[view->lines++].data = commit;
2129 string_copy(commit->id, line);
2130 commit->refs = get_refs(commit->id);
2131 commit->graph[commit->graph_size++] = ACS_LTEE;
2132 break;
2133
2134 case LINE_AUTHOR:
2135 {
2136 char *ident = line + STRING_SIZE("author ");
2137 char *end = strchr(ident, '<');
2138
2139 if (!commit)
2140 break;
2141
2142 if (end) {
2143 for (; end > ident && isspace(end[-1]); end--) ;
2144 *end = 0;
2145 }
2146
2147 string_copy(commit->author, ident);
2148
2149 /* Parse epoch and timezone */
2150 if (end) {
2151 char *secs = strchr(end + 1, '>');
2152 char *zone;
2153 time_t time;
2154
2155 if (!secs || secs[1] != ' ')
2156 break;
2157
2158 secs += 2;
2159 time = (time_t) atol(secs);
2160 zone = strchr(secs, ' ');
2161 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2162 long tz;
2163
2164 zone++;
2165 tz = ('0' - zone[1]) * 60 * 60 * 10;
2166 tz += ('0' - zone[2]) * 60 * 60;
2167 tz += ('0' - zone[3]) * 60;
2168 tz += ('0' - zone[4]) * 60;
2169
2170 if (zone[0] == '-')
2171 tz = -tz;
2172
2173 time -= tz;
2174 }
2175 gmtime_r(&time, &commit->time);
2176 }
2177 break;
2178 }
2179 default:
2180 if (!commit)
2181 break;
2182
2183 /* Fill in the commit title if it has not already been set. */
2184 if (commit->title[0])
2185 break;
2186
2187 /* Require titles to start with a non-space character at the
2188 * offset used by git log. */
2189 /* FIXME: More gracefull handling of titles; append "..." to
2190 * shortened titles, etc. */
2191 if (strncmp(line, " ", 4) ||
2192 isspace(line[4]))
2193 break;
2194
2195 string_copy(commit->title, line + 4);
2196 }
2197
2198 return TRUE;
2199 }
2200
2201 static bool
2202 main_enter(struct view *view, struct line *line)
2203 {
2204 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2205
2206 open_view(view, REQ_VIEW_DIFF, flags);
2207 return TRUE;
2208 }
2209
2210 static struct view_ops main_ops = {
2211 "commit",
2212 main_draw,
2213 main_read,
2214 main_enter,
2215 };
2216
2217
2218 /*
2219 * Unicode / UTF-8 handling
2220 *
2221 * NOTE: Much of the following code for dealing with unicode is derived from
2222 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2223 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2224 */
2225
2226 /* I've (over)annotated a lot of code snippets because I am not entirely
2227 * confident that the approach taken by this small UTF-8 interface is correct.
2228 * --jonas */
2229
2230 static inline int
2231 unicode_width(unsigned long c)
2232 {
2233 if (c >= 0x1100 &&
2234 (c <= 0x115f /* Hangul Jamo */
2235 || c == 0x2329
2236 || c == 0x232a
2237 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2238 /* CJK ... Yi */
2239 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2240 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2241 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2242 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2243 || (c >= 0xffe0 && c <= 0xffe6)
2244 || (c >= 0x20000 && c <= 0x2fffd)
2245 || (c >= 0x30000 && c <= 0x3fffd)))
2246 return 2;
2247
2248 return 1;
2249 }
2250
2251 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2252 * Illegal bytes are set one. */
2253 static const unsigned char utf8_bytes[256] = {
2254 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,
2255 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,
2256 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,
2257 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,
2258 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,
2259 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,
2260 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,
2261 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,
2262 };
2263
2264 /* Decode UTF-8 multi-byte representation into a unicode character. */
2265 static inline unsigned long
2266 utf8_to_unicode(const char *string, size_t length)
2267 {
2268 unsigned long unicode;
2269
2270 switch (length) {
2271 case 1:
2272 unicode = string[0];
2273 break;
2274 case 2:
2275 unicode = (string[0] & 0x1f) << 6;
2276 unicode += (string[1] & 0x3f);
2277 break;
2278 case 3:
2279 unicode = (string[0] & 0x0f) << 12;
2280 unicode += ((string[1] & 0x3f) << 6);
2281 unicode += (string[2] & 0x3f);
2282 break;
2283 case 4:
2284 unicode = (string[0] & 0x0f) << 18;
2285 unicode += ((string[1] & 0x3f) << 12);
2286 unicode += ((string[2] & 0x3f) << 6);
2287 unicode += (string[3] & 0x3f);
2288 break;
2289 case 5:
2290 unicode = (string[0] & 0x0f) << 24;
2291 unicode += ((string[1] & 0x3f) << 18);
2292 unicode += ((string[2] & 0x3f) << 12);
2293 unicode += ((string[3] & 0x3f) << 6);
2294 unicode += (string[4] & 0x3f);
2295 break;
2296 case 6:
2297 unicode = (string[0] & 0x01) << 30;
2298 unicode += ((string[1] & 0x3f) << 24);
2299 unicode += ((string[2] & 0x3f) << 18);
2300 unicode += ((string[3] & 0x3f) << 12);
2301 unicode += ((string[4] & 0x3f) << 6);
2302 unicode += (string[5] & 0x3f);
2303 break;
2304 default:
2305 die("Invalid unicode length");
2306 }
2307
2308 /* Invalid characters could return the special 0xfffd value but NUL
2309 * should be just as good. */
2310 return unicode > 0xffff ? 0 : unicode;
2311 }
2312
2313 /* Calculates how much of string can be shown within the given maximum width
2314 * and sets trimmed parameter to non-zero value if all of string could not be
2315 * shown.
2316 *
2317 * Additionally, adds to coloffset how many many columns to move to align with
2318 * the expected position. Takes into account how multi-byte and double-width
2319 * characters will effect the cursor position.
2320 *
2321 * Returns the number of bytes to output from string to satisfy max_width. */
2322 static size_t
2323 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
2324 {
2325 const char *start = string;
2326 const char *end = strchr(string, '\0');
2327 size_t mbwidth = 0;
2328 size_t width = 0;
2329
2330 *trimmed = 0;
2331
2332 while (string < end) {
2333 int c = *(unsigned char *) string;
2334 unsigned char bytes = utf8_bytes[c];
2335 size_t ucwidth;
2336 unsigned long unicode;
2337
2338 if (string + bytes > end)
2339 break;
2340
2341 /* Change representation to figure out whether
2342 * it is a single- or double-width character. */
2343
2344 unicode = utf8_to_unicode(string, bytes);
2345 /* FIXME: Graceful handling of invalid unicode character. */
2346 if (!unicode)
2347 break;
2348
2349 ucwidth = unicode_width(unicode);
2350 width += ucwidth;
2351 if (width > max_width) {
2352 *trimmed = 1;
2353 break;
2354 }
2355
2356 /* The column offset collects the differences between the
2357 * number of bytes encoding a character and the number of
2358 * columns will be used for rendering said character.
2359 *
2360 * So if some character A is encoded in 2 bytes, but will be
2361 * represented on the screen using only 1 byte this will and up
2362 * adding 1 to the multi-byte column offset.
2363 *
2364 * Assumes that no double-width character can be encoding in
2365 * less than two bytes. */
2366 if (bytes > ucwidth)
2367 mbwidth += bytes - ucwidth;
2368
2369 string += bytes;
2370 }
2371
2372 *coloffset += mbwidth;
2373
2374 return string - start;
2375 }
2376
2377
2378 /*
2379 * Status management
2380 */
2381
2382 /* Whether or not the curses interface has been initialized. */
2383 static bool cursed = FALSE;
2384
2385 /* The status window is used for polling keystrokes. */
2386 static WINDOW *status_win;
2387
2388 /* Update status and title window. */
2389 static void
2390 report(const char *msg, ...)
2391 {
2392 static bool empty = TRUE;
2393 struct view *view = display[current_view];
2394
2395 if (!empty || *msg) {
2396 va_list args;
2397
2398 va_start(args, msg);
2399
2400 werase(status_win);
2401 wmove(status_win, 0, 0);
2402 if (*msg) {
2403 vwprintw(status_win, msg, args);
2404 empty = FALSE;
2405 } else {
2406 empty = TRUE;
2407 }
2408 wrefresh(status_win);
2409
2410 va_end(args);
2411 }
2412
2413 update_view_title(view);
2414 update_display_cursor();
2415 }
2416
2417 /* Controls when nodelay should be in effect when polling user input. */
2418 static void
2419 set_nonblocking_input(bool loading)
2420 {
2421 static unsigned int loading_views;
2422
2423 if ((loading == FALSE && loading_views-- == 1) ||
2424 (loading == TRUE && loading_views++ == 0))
2425 nodelay(status_win, loading);
2426 }
2427
2428 static void
2429 init_display(void)
2430 {
2431 int x, y;
2432
2433 /* Initialize the curses library */
2434 if (isatty(STDIN_FILENO)) {
2435 cursed = !!initscr();
2436 } else {
2437 /* Leave stdin and stdout alone when acting as a pager. */
2438 FILE *io = fopen("/dev/tty", "r+");
2439
2440 cursed = !!newterm(NULL, io, io);
2441 }
2442
2443 if (!cursed)
2444 die("Failed to initialize curses");
2445
2446 nonl(); /* Tell curses not to do NL->CR/NL on output */
2447 cbreak(); /* Take input chars one at a time, no wait for \n */
2448 noecho(); /* Don't echo input */
2449 leaveok(stdscr, TRUE);
2450
2451 if (has_colors())
2452 init_colors();
2453
2454 getmaxyx(stdscr, y, x);
2455 status_win = newwin(1, 0, y - 1, 0);
2456 if (!status_win)
2457 die("Failed to create status window");
2458
2459 /* Enable keyboard mapping */
2460 keypad(status_win, TRUE);
2461 wbkgdset(status_win, get_line_attr(LINE_STATUS));
2462 }
2463
2464
2465 /*
2466 * Repository references
2467 */
2468
2469 static struct ref *refs;
2470 static size_t refs_size;
2471
2472 /* Id <-> ref store */
2473 static struct ref ***id_refs;
2474 static size_t id_refs_size;
2475
2476 static struct ref **
2477 get_refs(char *id)
2478 {
2479 struct ref ***tmp_id_refs;
2480 struct ref **ref_list = NULL;
2481 size_t ref_list_size = 0;
2482 size_t i;
2483
2484 for (i = 0; i < id_refs_size; i++)
2485 if (!strcmp(id, id_refs[i][0]->id))
2486 return id_refs[i];
2487
2488 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
2489 if (!tmp_id_refs)
2490 return NULL;
2491
2492 id_refs = tmp_id_refs;
2493
2494 for (i = 0; i < refs_size; i++) {
2495 struct ref **tmp;
2496
2497 if (strcmp(id, refs[i].id))
2498 continue;
2499
2500 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
2501 if (!tmp) {
2502 if (ref_list)
2503 free(ref_list);
2504 return NULL;
2505 }
2506
2507 ref_list = tmp;
2508 if (ref_list_size > 0)
2509 ref_list[ref_list_size - 1]->next = 1;
2510 ref_list[ref_list_size] = &refs[i];
2511
2512 /* XXX: The properties of the commit chains ensures that we can
2513 * safely modify the shared ref. The repo references will
2514 * always be similar for the same id. */
2515 ref_list[ref_list_size]->next = 0;
2516 ref_list_size++;
2517 }
2518
2519 if (ref_list)
2520 id_refs[id_refs_size++] = ref_list;
2521
2522 return ref_list;
2523 }
2524
2525 static int
2526 read_ref(char *id, int idlen, char *name, int namelen)
2527 {
2528 struct ref *ref;
2529 bool tag = FALSE;
2530
2531 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
2532 /* Commits referenced by tags has "^{}" appended. */
2533 if (name[namelen - 1] != '}')
2534 return OK;
2535
2536 while (namelen > 0 && name[namelen] != '^')
2537 namelen--;
2538
2539 tag = TRUE;
2540 namelen -= STRING_SIZE("refs/tags/");
2541 name += STRING_SIZE("refs/tags/");
2542
2543 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
2544 namelen -= STRING_SIZE("refs/heads/");
2545 name += STRING_SIZE("refs/heads/");
2546
2547 } else if (!strcmp(name, "HEAD")) {
2548 return OK;
2549 }
2550
2551 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
2552 if (!refs)
2553 return ERR;
2554
2555 ref = &refs[refs_size++];
2556 ref->name = malloc(namelen + 1);
2557 if (!ref->name)
2558 return ERR;
2559
2560 strncpy(ref->name, name, namelen);
2561 ref->name[namelen] = 0;
2562 ref->tag = tag;
2563 string_copy(ref->id, id);
2564
2565 return OK;
2566 }
2567
2568 static int
2569 load_refs(void)
2570 {
2571 const char *cmd_env = getenv("TIG_LS_REMOTE");
2572 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
2573
2574 return read_properties(popen(cmd, "r"), "\t", read_ref);
2575 }
2576
2577 static int
2578 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
2579 {
2580 if (!strcmp(name, "i18n.commitencoding"))
2581 string_copy(opt_encoding, value);
2582
2583 return OK;
2584 }
2585
2586 static int
2587 load_repo_config(void)
2588 {
2589 return read_properties(popen("git repo-config --list", "r"),
2590 "=", read_repo_config_option);
2591 }
2592
2593 static int
2594 read_properties(FILE *pipe, const char *separators,
2595 int (*read_property)(char *, int, char *, int))
2596 {
2597 char buffer[BUFSIZ];
2598 char *name;
2599 int state = OK;
2600
2601 if (!pipe)
2602 return ERR;
2603
2604 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
2605 char *value;
2606 size_t namelen;
2607 size_t valuelen;
2608
2609 name = chomp_string(name);
2610 namelen = strcspn(name, separators);
2611
2612 if (name[namelen]) {
2613 name[namelen] = 0;
2614 value = chomp_string(name + namelen + 1);
2615 valuelen = strlen(value);
2616
2617 } else {
2618 value = "";
2619 valuelen = 0;
2620 }
2621
2622 state = read_property(name, namelen, value, valuelen);
2623 }
2624
2625 if (state != ERR && ferror(pipe))
2626 state = ERR;
2627
2628 pclose(pipe);
2629
2630 return state;
2631 }
2632
2633
2634 /*
2635 * Main
2636 */
2637
2638 static void __NORETURN
2639 quit(int sig)
2640 {
2641 /* XXX: Restore tty modes and let the OS cleanup the rest! */
2642 if (cursed)
2643 endwin();
2644 exit(0);
2645 }
2646
2647 static void __NORETURN
2648 die(const char *err, ...)
2649 {
2650 va_list args;
2651
2652 endwin();
2653
2654 va_start(args, err);
2655 fputs("tig: ", stderr);
2656 vfprintf(stderr, err, args);
2657 fputs("\n", stderr);
2658 va_end(args);
2659
2660 exit(1);
2661 }
2662
2663 int
2664 main(int argc, char *argv[])
2665 {
2666 struct view *view;
2667 enum request request;
2668 size_t i;
2669
2670 signal(SIGINT, quit);
2671
2672 if (load_options() == ERR)
2673 die("Failed to load user config.");
2674
2675 /* Load the repo config file so options can be overwritten from
2676 * the command line. */
2677 if (load_repo_config() == ERR)
2678 die("Failed to load repo config.");
2679
2680 if (!parse_options(argc, argv))
2681 return 0;
2682
2683 if (load_refs() == ERR)
2684 die("Failed to load refs.");
2685
2686 /* Require a git repository unless when running in pager mode. */
2687 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
2688 die("Not a git repository");
2689
2690 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
2691 view->cmd_env = getenv(view->cmd_env);
2692
2693 request = opt_request;
2694
2695 init_display();
2696
2697 while (view_driver(display[current_view], request)) {
2698 int key;
2699 int i;
2700
2701 foreach_view (view, i)
2702 update_view(view);
2703
2704 /* Refresh, accept single keystroke of input */
2705 key = wgetch(status_win);
2706 request = get_keybinding(key);
2707
2708 /* Some low-level request handling. This keeps access to
2709 * status_win restricted. */
2710 switch (request) {
2711 case REQ_PROMPT:
2712 report(":");
2713 /* Temporarily switch to line-oriented and echoed
2714 * input. */
2715 nocbreak();
2716 echo();
2717
2718 if (wgetnstr(status_win, opt_cmd + 4, sizeof(opt_cmd) - 4) == OK) {
2719 memcpy(opt_cmd, "git ", 4);
2720 opt_request = REQ_VIEW_PAGER;
2721 } else {
2722 report("Prompt interrupted by loading view, "
2723 "press 'z' to stop loading views");
2724 request = REQ_SCREEN_UPDATE;
2725 }
2726
2727 noecho();
2728 cbreak();
2729 break;
2730
2731 case REQ_SCREEN_RESIZE:
2732 {
2733 int height, width;
2734
2735 getmaxyx(stdscr, height, width);
2736
2737 /* Resize the status view and let the view driver take
2738 * care of resizing the displayed views. */
2739 wresize(status_win, 1, width);
2740 mvwin(status_win, height - 1, 0);
2741 wrefresh(status_win);
2742 break;
2743 }
2744 default:
2745 break;
2746 }
2747 }
2748
2749 quit(0);
2750
2751 return 0;
2752 }
Full-screen terminal Git browser.