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