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Make tig handle GIT_DIR better
[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-0.5.git"
16 #endif
17
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
32
33 #include <sys/types.h>
34 #include <regex.h>
35
36 #include <locale.h>
37 #include <langinfo.h>
38 #include <iconv.h>
39
40 #include <curses.h>
41
42 #if __GNUC__ >= 3
43 #define __NORETURN __attribute__((__noreturn__))
44 #else
45 #define __NORETURN
46 #endif
47
48 static void __NORETURN die(const char *err, ...);
49 static void report(const char *msg, ...);
50 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
51 static void set_nonblocking_input(bool loading);
52 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
53
54 #define ABS(x) ((x) >= 0 ? (x) : -(x))
55 #define MIN(x, y) ((x) < (y) ? (x) : (y))
56
57 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
58 #define STRING_SIZE(x) (sizeof(x) - 1)
59
60 #define SIZEOF_STR 1024 /* Default string size. */
61 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
62 #define SIZEOF_REV 41 /* Holds a SHA-1 and an ending NUL */
63 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
64
65 /* This color name can be used to refer to the default term colors. */
66 #define COLOR_DEFAULT (-1)
67
68 #define ICONV_NONE ((iconv_t) -1)
69
70 /* The format and size of the date column in the main view. */
71 #define DATE_FORMAT "%Y-%m-%d %H:%M"
72 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
73
74 #define AUTHOR_COLS 20
75
76 /* The default interval between line numbers. */
77 #define NUMBER_INTERVAL 1
78
79 #define TABSIZE 8
80
81 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
82
83 #define TIG_LS_REMOTE \
84 "git ls-remote $(git rev-parse --git-dir) 2>/dev/null"
85
86 #define TIG_DIFF_CMD \
87 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
88
89 #define TIG_LOG_CMD \
90 "git log --cc --stat -n100 %s 2>/dev/null"
91
92 #define TIG_MAIN_CMD \
93 "git log --topo-order --pretty=raw %s 2>/dev/null"
94
95 #define TIG_TREE_CMD \
96 "git ls-tree %s %s"
97
98 #define TIG_BLOB_CMD \
99 "git cat-file blob %s"
100
101 /* XXX: Needs to be defined to the empty string. */
102 #define TIG_HELP_CMD ""
103 #define TIG_PAGER_CMD ""
104
105 /* Some ascii-shorthands fitted into the ncurses namespace. */
106 #define KEY_TAB '\t'
107 #define KEY_RETURN '\r'
108 #define KEY_ESC 27
109
110
111 struct ref {
112 char *name; /* Ref name; tag or head names are shortened. */
113 char id[SIZEOF_REV]; /* Commit SHA1 ID */
114 unsigned int tag:1; /* Is it a tag? */
115 unsigned int next:1; /* For ref lists: are there more refs? */
116 };
117
118 static struct ref **get_refs(char *id);
119
120 struct int_map {
121 const char *name;
122 int namelen;
123 int value;
124 };
125
126 static int
127 set_from_int_map(struct int_map *map, size_t map_size,
128 int *value, const char *name, int namelen)
129 {
130
131 int i;
132
133 for (i = 0; i < map_size; i++)
134 if (namelen == map[i].namelen &&
135 !strncasecmp(name, map[i].name, namelen)) {
136 *value = map[i].value;
137 return OK;
138 }
139
140 return ERR;
141 }
142
143
144 /*
145 * String helpers
146 */
147
148 static inline void
149 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
150 {
151 if (srclen > dstlen - 1)
152 srclen = dstlen - 1;
153
154 strncpy(dst, src, srclen);
155 dst[srclen] = 0;
156 }
157
158 /* Shorthands for safely copying into a fixed buffer. */
159
160 #define string_copy(dst, src) \
161 string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
162
163 #define string_ncopy(dst, src, srclen) \
164 string_ncopy_do(dst, sizeof(dst), src, srclen)
165
166 static char *
167 chomp_string(char *name)
168 {
169 int namelen;
170
171 while (isspace(*name))
172 name++;
173
174 namelen = strlen(name) - 1;
175 while (namelen > 0 && isspace(name[namelen]))
176 name[namelen--] = 0;
177
178 return name;
179 }
180
181 static bool
182 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
183 {
184 va_list args;
185 size_t pos = bufpos ? *bufpos : 0;
186
187 va_start(args, fmt);
188 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
189 va_end(args);
190
191 if (bufpos)
192 *bufpos = pos;
193
194 return pos >= bufsize ? FALSE : TRUE;
195 }
196
197 #define string_format(buf, fmt, args...) \
198 string_nformat(buf, sizeof(buf), NULL, fmt, args)
199
200 #define string_format_from(buf, from, fmt, args...) \
201 string_nformat(buf, sizeof(buf), from, fmt, args)
202
203 static int
204 string_enum_compare(const char *str1, const char *str2, int len)
205 {
206 size_t i;
207
208 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
209
210 /* Diff-Header == DIFF_HEADER */
211 for (i = 0; i < len; i++) {
212 if (toupper(str1[i]) == toupper(str2[i]))
213 continue;
214
215 if (string_enum_sep(str1[i]) &&
216 string_enum_sep(str2[i]))
217 continue;
218
219 return str1[i] - str2[i];
220 }
221
222 return 0;
223 }
224
225 /* Shell quoting
226 *
227 * NOTE: The following is a slightly modified copy of the git project's shell
228 * quoting routines found in the quote.c file.
229 *
230 * Help to copy the thing properly quoted for the shell safety. any single
231 * quote is replaced with '\'', any exclamation point is replaced with '\!',
232 * and the whole thing is enclosed in a
233 *
234 * E.g.
235 * original sq_quote result
236 * name ==> name ==> 'name'
237 * a b ==> a b ==> 'a b'
238 * a'b ==> a'\''b ==> 'a'\''b'
239 * a!b ==> a'\!'b ==> 'a'\!'b'
240 */
241
242 static size_t
243 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
244 {
245 char c;
246
247 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
248
249 BUFPUT('\'');
250 while ((c = *src++)) {
251 if (c == '\'' || c == '!') {
252 BUFPUT('\'');
253 BUFPUT('\\');
254 BUFPUT(c);
255 BUFPUT('\'');
256 } else {
257 BUFPUT(c);
258 }
259 }
260 BUFPUT('\'');
261
262 return bufsize;
263 }
264
265
266 /*
267 * User requests
268 */
269
270 #define REQ_INFO \
271 /* XXX: Keep the view request first and in sync with views[]. */ \
272 REQ_GROUP("View switching") \
273 REQ_(VIEW_MAIN, "Show main view"), \
274 REQ_(VIEW_DIFF, "Show diff view"), \
275 REQ_(VIEW_LOG, "Show log view"), \
276 REQ_(VIEW_TREE, "Show tree view"), \
277 REQ_(VIEW_BLOB, "Show blob view"), \
278 REQ_(VIEW_HELP, "Show help page"), \
279 REQ_(VIEW_PAGER, "Show pager view"), \
280 \
281 REQ_GROUP("View manipulation") \
282 REQ_(ENTER, "Enter current line and scroll"), \
283 REQ_(NEXT, "Move to next"), \
284 REQ_(PREVIOUS, "Move to previous"), \
285 REQ_(VIEW_NEXT, "Move focus to next view"), \
286 REQ_(VIEW_CLOSE, "Close the current view"), \
287 REQ_(QUIT, "Close all views and quit"), \
288 \
289 REQ_GROUP("Cursor navigation") \
290 REQ_(MOVE_UP, "Move cursor one line up"), \
291 REQ_(MOVE_DOWN, "Move cursor one line down"), \
292 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
293 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
294 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
295 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
296 \
297 REQ_GROUP("Scrolling") \
298 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
299 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
300 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
301 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
302 \
303 REQ_GROUP("Searching") \
304 REQ_(SEARCH, "Search the view"), \
305 REQ_(SEARCH_BACK, "Search backwards in the view"), \
306 REQ_(FIND_NEXT, "Find next search match"), \
307 REQ_(FIND_PREV, "Find previous search match"), \
308 \
309 REQ_GROUP("Misc") \
310 REQ_(NONE, "Do nothing"), \
311 REQ_(PROMPT, "Bring up the prompt"), \
312 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
313 REQ_(SCREEN_RESIZE, "Resize the screen"), \
314 REQ_(SHOW_VERSION, "Show version information"), \
315 REQ_(STOP_LOADING, "Stop all loading views"), \
316 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
317 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
318
319
320 /* User action requests. */
321 enum request {
322 #define REQ_GROUP(help)
323 #define REQ_(req, help) REQ_##req
324
325 /* Offset all requests to avoid conflicts with ncurses getch values. */
326 REQ_OFFSET = KEY_MAX + 1,
327 REQ_INFO,
328 REQ_UNKNOWN,
329
330 #undef REQ_GROUP
331 #undef REQ_
332 };
333
334 struct request_info {
335 enum request request;
336 char *name;
337 int namelen;
338 char *help;
339 };
340
341 static struct request_info req_info[] = {
342 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
343 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
344 REQ_INFO
345 #undef REQ_GROUP
346 #undef REQ_
347 };
348
349 static enum request
350 get_request(const char *name)
351 {
352 int namelen = strlen(name);
353 int i;
354
355 for (i = 0; i < ARRAY_SIZE(req_info); i++)
356 if (req_info[i].namelen == namelen &&
357 !string_enum_compare(req_info[i].name, name, namelen))
358 return req_info[i].request;
359
360 return REQ_UNKNOWN;
361 }
362
363
364 /*
365 * Options
366 */
367
368 static const char usage[] =
369 VERSION " (" __DATE__ ")\n"
370 "\n"
371 "Usage: tig [options]\n"
372 " or: tig [options] [--] [git log options]\n"
373 " or: tig [options] log [git log options]\n"
374 " or: tig [options] diff [git diff options]\n"
375 " or: tig [options] show [git show options]\n"
376 " or: tig [options] < [git command output]\n"
377 "\n"
378 "Options:\n"
379 " -l Start up in log view\n"
380 " -d Start up in diff view\n"
381 " -n[I], --line-number[=I] Show line numbers with given interval\n"
382 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
383 " -- Mark end of tig options\n"
384 " -v, --version Show version and exit\n"
385 " -h, --help Show help message and exit\n";
386
387 /* Option and state variables. */
388 static bool opt_line_number = FALSE;
389 static bool opt_rev_graph = TRUE;
390 static int opt_num_interval = NUMBER_INTERVAL;
391 static int opt_tab_size = TABSIZE;
392 static enum request opt_request = REQ_VIEW_MAIN;
393 static char opt_cmd[SIZEOF_STR] = "";
394 static char opt_path[SIZEOF_STR] = "";
395 static FILE *opt_pipe = NULL;
396 static char opt_encoding[20] = "UTF-8";
397 static bool opt_utf8 = TRUE;
398 static char opt_codeset[20] = "UTF-8";
399 static iconv_t opt_iconv = ICONV_NONE;
400 static char opt_search[SIZEOF_STR] = "";
401
402 enum option_type {
403 OPT_NONE,
404 OPT_INT,
405 };
406
407 static bool
408 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
409 {
410 va_list args;
411 char *value = "";
412 int *number;
413
414 if (opt[0] != '-')
415 return FALSE;
416
417 if (opt[1] == '-') {
418 int namelen = strlen(name);
419
420 opt += 2;
421
422 if (strncmp(opt, name, namelen))
423 return FALSE;
424
425 if (opt[namelen] == '=')
426 value = opt + namelen + 1;
427
428 } else {
429 if (!short_name || opt[1] != short_name)
430 return FALSE;
431 value = opt + 2;
432 }
433
434 va_start(args, type);
435 if (type == OPT_INT) {
436 number = va_arg(args, int *);
437 if (isdigit(*value))
438 *number = atoi(value);
439 }
440 va_end(args);
441
442 return TRUE;
443 }
444
445 /* Returns the index of log or diff command or -1 to exit. */
446 static bool
447 parse_options(int argc, char *argv[])
448 {
449 int i;
450
451 for (i = 1; i < argc; i++) {
452 char *opt = argv[i];
453
454 if (!strcmp(opt, "log") ||
455 !strcmp(opt, "diff") ||
456 !strcmp(opt, "show")) {
457 opt_request = opt[0] == 'l'
458 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
459 break;
460 }
461
462 if (opt[0] && opt[0] != '-')
463 break;
464
465 if (!strcmp(opt, "-l")) {
466 opt_request = REQ_VIEW_LOG;
467 continue;
468 }
469
470 if (!strcmp(opt, "-d")) {
471 opt_request = REQ_VIEW_DIFF;
472 continue;
473 }
474
475 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
476 opt_line_number = TRUE;
477 continue;
478 }
479
480 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
481 opt_tab_size = MIN(opt_tab_size, TABSIZE);
482 continue;
483 }
484
485 if (check_option(opt, 'v', "version", OPT_NONE)) {
486 printf("tig version %s\n", VERSION);
487 return FALSE;
488 }
489
490 if (check_option(opt, 'h', "help", OPT_NONE)) {
491 printf(usage);
492 return FALSE;
493 }
494
495 if (!strcmp(opt, "--")) {
496 i++;
497 break;
498 }
499
500 die("unknown option '%s'\n\n%s", opt, usage);
501 }
502
503 if (!isatty(STDIN_FILENO)) {
504 opt_request = REQ_VIEW_PAGER;
505 opt_pipe = stdin;
506
507 } else if (i < argc) {
508 size_t buf_size;
509
510 if (opt_request == REQ_VIEW_MAIN)
511 /* XXX: This is vulnerable to the user overriding
512 * options required for the main view parser. */
513 string_copy(opt_cmd, "git log --pretty=raw");
514 else
515 string_copy(opt_cmd, "git");
516 buf_size = strlen(opt_cmd);
517
518 while (buf_size < sizeof(opt_cmd) && i < argc) {
519 opt_cmd[buf_size++] = ' ';
520 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
521 }
522
523 if (buf_size >= sizeof(opt_cmd))
524 die("command too long");
525
526 opt_cmd[buf_size] = 0;
527 }
528
529 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
530 opt_utf8 = FALSE;
531
532 return TRUE;
533 }
534
535
536 /*
537 * Line-oriented content detection.
538 */
539
540 #define LINE_INFO \
541 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
542 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
543 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
544 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
545 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
546 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
547 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
548 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
549 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
550 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
551 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
552 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
553 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
554 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
555 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
556 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
557 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
558 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
559 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
560 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
561 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
562 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
563 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
564 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
565 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
566 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
567 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
568 LINE(ACKED, " Acked-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
569 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
570 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
571 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
572 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
573 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
574 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
575 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
576 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
577 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
578 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
579 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
580 LINE(TREE_DIR, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
581 LINE(TREE_FILE, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL)
582
583 enum line_type {
584 #define LINE(type, line, fg, bg, attr) \
585 LINE_##type
586 LINE_INFO
587 #undef LINE
588 };
589
590 struct line_info {
591 const char *name; /* Option name. */
592 int namelen; /* Size of option name. */
593 const char *line; /* The start of line to match. */
594 int linelen; /* Size of string to match. */
595 int fg, bg, attr; /* Color and text attributes for the lines. */
596 };
597
598 static struct line_info line_info[] = {
599 #define LINE(type, line, fg, bg, attr) \
600 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
601 LINE_INFO
602 #undef LINE
603 };
604
605 static enum line_type
606 get_line_type(char *line)
607 {
608 int linelen = strlen(line);
609 enum line_type type;
610
611 for (type = 0; type < ARRAY_SIZE(line_info); type++)
612 /* Case insensitive search matches Signed-off-by lines better. */
613 if (linelen >= line_info[type].linelen &&
614 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
615 return type;
616
617 return LINE_DEFAULT;
618 }
619
620 static inline int
621 get_line_attr(enum line_type type)
622 {
623 assert(type < ARRAY_SIZE(line_info));
624 return COLOR_PAIR(type) | line_info[type].attr;
625 }
626
627 static struct line_info *
628 get_line_info(char *name, int namelen)
629 {
630 enum line_type type;
631
632 for (type = 0; type < ARRAY_SIZE(line_info); type++)
633 if (namelen == line_info[type].namelen &&
634 !string_enum_compare(line_info[type].name, name, namelen))
635 return &line_info[type];
636
637 return NULL;
638 }
639
640 static void
641 init_colors(void)
642 {
643 int default_bg = COLOR_BLACK;
644 int default_fg = COLOR_WHITE;
645 enum line_type type;
646
647 start_color();
648
649 if (use_default_colors() != ERR) {
650 default_bg = -1;
651 default_fg = -1;
652 }
653
654 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
655 struct line_info *info = &line_info[type];
656 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
657 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
658
659 init_pair(type, fg, bg);
660 }
661 }
662
663 struct line {
664 enum line_type type;
665
666 /* State flags */
667 unsigned int selected:1;
668
669 void *data; /* User data */
670 };
671
672
673 /*
674 * Keys
675 */
676
677 struct keybinding {
678 int alias;
679 enum request request;
680 struct keybinding *next;
681 };
682
683 static struct keybinding default_keybindings[] = {
684 /* View switching */
685 { 'm', REQ_VIEW_MAIN },
686 { 'd', REQ_VIEW_DIFF },
687 { 'l', REQ_VIEW_LOG },
688 { 't', REQ_VIEW_TREE },
689 { 'f', REQ_VIEW_BLOB },
690 { 'p', REQ_VIEW_PAGER },
691 { 'h', REQ_VIEW_HELP },
692
693 /* View manipulation */
694 { 'q', REQ_VIEW_CLOSE },
695 { KEY_TAB, REQ_VIEW_NEXT },
696 { KEY_RETURN, REQ_ENTER },
697 { KEY_UP, REQ_PREVIOUS },
698 { KEY_DOWN, REQ_NEXT },
699
700 /* Cursor navigation */
701 { 'k', REQ_MOVE_UP },
702 { 'j', REQ_MOVE_DOWN },
703 { KEY_HOME, REQ_MOVE_FIRST_LINE },
704 { KEY_END, REQ_MOVE_LAST_LINE },
705 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
706 { ' ', REQ_MOVE_PAGE_DOWN },
707 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
708 { 'b', REQ_MOVE_PAGE_UP },
709 { '-', REQ_MOVE_PAGE_UP },
710
711 /* Scrolling */
712 { KEY_IC, REQ_SCROLL_LINE_UP },
713 { KEY_DC, REQ_SCROLL_LINE_DOWN },
714 { 'w', REQ_SCROLL_PAGE_UP },
715 { 's', REQ_SCROLL_PAGE_DOWN },
716
717 /* Searching */
718 { '/', REQ_SEARCH },
719 { '?', REQ_SEARCH_BACK },
720 { 'n', REQ_FIND_NEXT },
721 { 'N', REQ_FIND_PREV },
722
723 /* Misc */
724 { 'Q', REQ_QUIT },
725 { 'z', REQ_STOP_LOADING },
726 { 'v', REQ_SHOW_VERSION },
727 { 'r', REQ_SCREEN_REDRAW },
728 { '.', REQ_TOGGLE_LINENO },
729 { 'g', REQ_TOGGLE_REV_GRAPH },
730 { ':', REQ_PROMPT },
731
732 /* Using the ncurses SIGWINCH handler. */
733 { KEY_RESIZE, REQ_SCREEN_RESIZE },
734 };
735
736 #define KEYMAP_INFO \
737 KEYMAP_(GENERIC), \
738 KEYMAP_(MAIN), \
739 KEYMAP_(DIFF), \
740 KEYMAP_(LOG), \
741 KEYMAP_(TREE), \
742 KEYMAP_(BLOB), \
743 KEYMAP_(PAGER), \
744 KEYMAP_(HELP) \
745
746 enum keymap {
747 #define KEYMAP_(name) KEYMAP_##name
748 KEYMAP_INFO
749 #undef KEYMAP_
750 };
751
752 static struct int_map keymap_table[] = {
753 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
754 KEYMAP_INFO
755 #undef KEYMAP_
756 };
757
758 #define set_keymap(map, name) \
759 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
760
761 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
762
763 static void
764 add_keybinding(enum keymap keymap, enum request request, int key)
765 {
766 struct keybinding *keybinding;
767
768 keybinding = calloc(1, sizeof(*keybinding));
769 if (!keybinding)
770 die("Failed to allocate keybinding");
771
772 keybinding->alias = key;
773 keybinding->request = request;
774 keybinding->next = keybindings[keymap];
775 keybindings[keymap] = keybinding;
776 }
777
778 /* Looks for a key binding first in the given map, then in the generic map, and
779 * lastly in the default keybindings. */
780 static enum request
781 get_keybinding(enum keymap keymap, int key)
782 {
783 struct keybinding *kbd;
784 int i;
785
786 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
787 if (kbd->alias == key)
788 return kbd->request;
789
790 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
791 if (kbd->alias == key)
792 return kbd->request;
793
794 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
795 if (default_keybindings[i].alias == key)
796 return default_keybindings[i].request;
797
798 return (enum request) key;
799 }
800
801
802 struct key {
803 char *name;
804 int value;
805 };
806
807 static struct key key_table[] = {
808 { "Enter", KEY_RETURN },
809 { "Space", ' ' },
810 { "Backspace", KEY_BACKSPACE },
811 { "Tab", KEY_TAB },
812 { "Escape", KEY_ESC },
813 { "Left", KEY_LEFT },
814 { "Right", KEY_RIGHT },
815 { "Up", KEY_UP },
816 { "Down", KEY_DOWN },
817 { "Insert", KEY_IC },
818 { "Delete", KEY_DC },
819 { "Hash", '#' },
820 { "Home", KEY_HOME },
821 { "End", KEY_END },
822 { "PageUp", KEY_PPAGE },
823 { "PageDown", KEY_NPAGE },
824 { "F1", KEY_F(1) },
825 { "F2", KEY_F(2) },
826 { "F3", KEY_F(3) },
827 { "F4", KEY_F(4) },
828 { "F5", KEY_F(5) },
829 { "F6", KEY_F(6) },
830 { "F7", KEY_F(7) },
831 { "F8", KEY_F(8) },
832 { "F9", KEY_F(9) },
833 { "F10", KEY_F(10) },
834 { "F11", KEY_F(11) },
835 { "F12", KEY_F(12) },
836 };
837
838 static int
839 get_key_value(const char *name)
840 {
841 int i;
842
843 for (i = 0; i < ARRAY_SIZE(key_table); i++)
844 if (!strcasecmp(key_table[i].name, name))
845 return key_table[i].value;
846
847 if (strlen(name) == 1 && isprint(*name))
848 return (int) *name;
849
850 return ERR;
851 }
852
853 static char *
854 get_key(enum request request)
855 {
856 static char buf[BUFSIZ];
857 static char key_char[] = "'X'";
858 size_t pos = 0;
859 char *sep = " ";
860 int i;
861
862 buf[pos] = 0;
863
864 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
865 struct keybinding *keybinding = &default_keybindings[i];
866 char *seq = NULL;
867 int key;
868
869 if (keybinding->request != request)
870 continue;
871
872 for (key = 0; key < ARRAY_SIZE(key_table); key++)
873 if (key_table[key].value == keybinding->alias)
874 seq = key_table[key].name;
875
876 if (seq == NULL &&
877 keybinding->alias < 127 &&
878 isprint(keybinding->alias)) {
879 key_char[1] = (char) keybinding->alias;
880 seq = key_char;
881 }
882
883 if (!seq)
884 seq = "'?'";
885
886 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
887 return "Too many keybindings!";
888 sep = ", ";
889 }
890
891 return buf;
892 }
893
894
895 /*
896 * User config file handling.
897 */
898
899 static struct int_map color_map[] = {
900 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
901 COLOR_MAP(DEFAULT),
902 COLOR_MAP(BLACK),
903 COLOR_MAP(BLUE),
904 COLOR_MAP(CYAN),
905 COLOR_MAP(GREEN),
906 COLOR_MAP(MAGENTA),
907 COLOR_MAP(RED),
908 COLOR_MAP(WHITE),
909 COLOR_MAP(YELLOW),
910 };
911
912 #define set_color(color, name) \
913 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
914
915 static struct int_map attr_map[] = {
916 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
917 ATTR_MAP(NORMAL),
918 ATTR_MAP(BLINK),
919 ATTR_MAP(BOLD),
920 ATTR_MAP(DIM),
921 ATTR_MAP(REVERSE),
922 ATTR_MAP(STANDOUT),
923 ATTR_MAP(UNDERLINE),
924 };
925
926 #define set_attribute(attr, name) \
927 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
928
929 static int config_lineno;
930 static bool config_errors;
931 static char *config_msg;
932
933 /* Wants: object fgcolor bgcolor [attr] */
934 static int
935 option_color_command(int argc, char *argv[])
936 {
937 struct line_info *info;
938
939 if (argc != 3 && argc != 4) {
940 config_msg = "Wrong number of arguments given to color command";
941 return ERR;
942 }
943
944 info = get_line_info(argv[0], strlen(argv[0]));
945 if (!info) {
946 config_msg = "Unknown color name";
947 return ERR;
948 }
949
950 if (set_color(&info->fg, argv[1]) == ERR ||
951 set_color(&info->bg, argv[2]) == ERR) {
952 config_msg = "Unknown color";
953 return ERR;
954 }
955
956 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
957 config_msg = "Unknown attribute";
958 return ERR;
959 }
960
961 return OK;
962 }
963
964 /* Wants: name = value */
965 static int
966 option_set_command(int argc, char *argv[])
967 {
968 if (argc != 3) {
969 config_msg = "Wrong number of arguments given to set command";
970 return ERR;
971 }
972
973 if (strcmp(argv[1], "=")) {
974 config_msg = "No value assigned";
975 return ERR;
976 }
977
978 if (!strcmp(argv[0], "show-rev-graph")) {
979 opt_rev_graph = (!strcmp(argv[2], "1") ||
980 !strcmp(argv[2], "true") ||
981 !strcmp(argv[2], "yes"));
982 return OK;
983 }
984
985 if (!strcmp(argv[0], "line-number-interval")) {
986 opt_num_interval = atoi(argv[2]);
987 return OK;
988 }
989
990 if (!strcmp(argv[0], "tab-size")) {
991 opt_tab_size = atoi(argv[2]);
992 return OK;
993 }
994
995 if (!strcmp(argv[0], "commit-encoding")) {
996 char *arg = argv[2];
997 int delimiter = *arg;
998 int i;
999
1000 switch (delimiter) {
1001 case '"':
1002 case '\'':
1003 for (arg++, i = 0; arg[i]; i++)
1004 if (arg[i] == delimiter) {
1005 arg[i] = 0;
1006 break;
1007 }
1008 default:
1009 string_copy(opt_encoding, arg);
1010 return OK;
1011 }
1012 }
1013
1014 config_msg = "Unknown variable name";
1015 return ERR;
1016 }
1017
1018 /* Wants: mode request key */
1019 static int
1020 option_bind_command(int argc, char *argv[])
1021 {
1022 enum request request;
1023 int keymap;
1024 int key;
1025
1026 if (argc != 3) {
1027 config_msg = "Wrong number of arguments given to bind command";
1028 return ERR;
1029 }
1030
1031 if (set_keymap(&keymap, argv[0]) == ERR) {
1032 config_msg = "Unknown key map";
1033 return ERR;
1034 }
1035
1036 key = get_key_value(argv[1]);
1037 if (key == ERR) {
1038 config_msg = "Unknown key";
1039 return ERR;
1040 }
1041
1042 request = get_request(argv[2]);
1043 if (request == REQ_UNKNOWN) {
1044 config_msg = "Unknown request name";
1045 return ERR;
1046 }
1047
1048 add_keybinding(keymap, request, key);
1049
1050 return OK;
1051 }
1052
1053 static int
1054 set_option(char *opt, char *value)
1055 {
1056 char *argv[16];
1057 int valuelen;
1058 int argc = 0;
1059
1060 /* Tokenize */
1061 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1062 argv[argc++] = value;
1063
1064 value += valuelen;
1065 if (!*value)
1066 break;
1067
1068 *value++ = 0;
1069 while (isspace(*value))
1070 value++;
1071 }
1072
1073 if (!strcmp(opt, "color"))
1074 return option_color_command(argc, argv);
1075
1076 if (!strcmp(opt, "set"))
1077 return option_set_command(argc, argv);
1078
1079 if (!strcmp(opt, "bind"))
1080 return option_bind_command(argc, argv);
1081
1082 config_msg = "Unknown option command";
1083 return ERR;
1084 }
1085
1086 static int
1087 read_option(char *opt, int optlen, char *value, int valuelen)
1088 {
1089 int status = OK;
1090
1091 config_lineno++;
1092 config_msg = "Internal error";
1093
1094 /* Check for comment markers, since read_properties() will
1095 * only ensure opt and value are split at first " \t". */
1096 optlen = strcspn(opt, "#");
1097 if (optlen == 0)
1098 return OK;
1099
1100 if (opt[optlen] != 0) {
1101 config_msg = "No option value";
1102 status = ERR;
1103
1104 } else {
1105 /* Look for comment endings in the value. */
1106 int len = strcspn(value, "#");
1107
1108 if (len < valuelen) {
1109 valuelen = len;
1110 value[valuelen] = 0;
1111 }
1112
1113 status = set_option(opt, value);
1114 }
1115
1116 if (status == ERR) {
1117 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1118 config_lineno, optlen, opt, config_msg);
1119 config_errors = TRUE;
1120 }
1121
1122 /* Always keep going if errors are encountered. */
1123 return OK;
1124 }
1125
1126 static int
1127 load_options(void)
1128 {
1129 char *home = getenv("HOME");
1130 char buf[SIZEOF_STR];
1131 FILE *file;
1132
1133 config_lineno = 0;
1134 config_errors = FALSE;
1135
1136 if (!home || !string_format(buf, "%s/.tigrc", home))
1137 return ERR;
1138
1139 /* It's ok that the file doesn't exist. */
1140 file = fopen(buf, "r");
1141 if (!file)
1142 return OK;
1143
1144 if (read_properties(file, " \t", read_option) == ERR ||
1145 config_errors == TRUE)
1146 fprintf(stderr, "Errors while loading %s.\n", buf);
1147
1148 return OK;
1149 }
1150
1151
1152 /*
1153 * The viewer
1154 */
1155
1156 struct view;
1157 struct view_ops;
1158
1159 /* The display array of active views and the index of the current view. */
1160 static struct view *display[2];
1161 static unsigned int current_view;
1162
1163 /* Reading from the prompt? */
1164 static bool input_mode = FALSE;
1165
1166 #define foreach_displayed_view(view, i) \
1167 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1168
1169 #define displayed_views() (display[1] != NULL ? 2 : 1)
1170
1171 /* Current head and commit ID */
1172 static char ref_blob[SIZEOF_REF] = "";
1173 static char ref_commit[SIZEOF_REF] = "HEAD";
1174 static char ref_head[SIZEOF_REF] = "HEAD";
1175
1176 struct view {
1177 const char *name; /* View name */
1178 const char *cmd_fmt; /* Default command line format */
1179 const char *cmd_env; /* Command line set via environment */
1180 const char *id; /* Points to either of ref_{head,commit,blob} */
1181
1182 struct view_ops *ops; /* View operations */
1183
1184 enum keymap keymap; /* What keymap does this view have */
1185
1186 char cmd[SIZEOF_STR]; /* Command buffer */
1187 char ref[SIZEOF_REF]; /* Hovered commit reference */
1188 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
1189
1190 int height, width; /* The width and height of the main window */
1191 WINDOW *win; /* The main window */
1192 WINDOW *title; /* The title window living below the main window */
1193
1194 /* Navigation */
1195 unsigned long offset; /* Offset of the window top */
1196 unsigned long lineno; /* Current line number */
1197
1198 /* Searching */
1199 char grep[SIZEOF_STR]; /* Search string */
1200 regex_t *regex; /* Pre-compiled regex */
1201
1202 /* If non-NULL, points to the view that opened this view. If this view
1203 * is closed tig will switch back to the parent view. */
1204 struct view *parent;
1205
1206 /* Buffering */
1207 unsigned long lines; /* Total number of lines */
1208 struct line *line; /* Line index */
1209 unsigned long line_size;/* Total number of allocated lines */
1210 unsigned int digits; /* Number of digits in the lines member. */
1211
1212 /* Loading */
1213 FILE *pipe;
1214 time_t start_time;
1215 };
1216
1217 struct view_ops {
1218 /* What type of content being displayed. Used in the title bar. */
1219 const char *type;
1220 /* Draw one line; @lineno must be < view->height. */
1221 bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
1222 /* Read one line; updates view->line. */
1223 bool (*read)(struct view *view, char *data);
1224 /* Depending on view, change display based on current line. */
1225 bool (*enter)(struct view *view, struct line *line);
1226 /* Search for regex in a line. */
1227 bool (*grep)(struct view *view, struct line *line);
1228 /* Select line */
1229 void (*select)(struct view *view, struct line *line);
1230 };
1231
1232 static struct view_ops pager_ops;
1233 static struct view_ops main_ops;
1234 static struct view_ops tree_ops;
1235 static struct view_ops blob_ops;
1236
1237 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1238 { name, cmd, #env, ref, ops, map}
1239
1240 #define VIEW_(id, name, ops, ref) \
1241 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1242
1243
1244 static struct view views[] = {
1245 VIEW_(MAIN, "main", &main_ops, ref_head),
1246 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1247 VIEW_(LOG, "log", &pager_ops, ref_head),
1248 VIEW_(TREE, "tree", &tree_ops, ref_commit),
1249 VIEW_(BLOB, "blob", &blob_ops, ref_blob),
1250 VIEW_(HELP, "help", &pager_ops, "static"),
1251 VIEW_(PAGER, "pager", &pager_ops, "static"),
1252 };
1253
1254 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1255
1256 #define foreach_view(view, i) \
1257 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1258
1259 #define view_is_displayed(view) \
1260 (view == display[0] || view == display[1])
1261
1262 static bool
1263 draw_view_line(struct view *view, unsigned int lineno)
1264 {
1265 struct line *line;
1266 bool selected = (view->offset + lineno == view->lineno);
1267 bool draw_ok;
1268
1269 assert(view_is_displayed(view));
1270
1271 if (view->offset + lineno >= view->lines)
1272 return FALSE;
1273
1274 line = &view->line[view->offset + lineno];
1275
1276 if (selected) {
1277 line->selected = TRUE;
1278 view->ops->select(view, line);
1279 } else if (line->selected) {
1280 line->selected = FALSE;
1281 wmove(view->win, lineno, 0);
1282 wclrtoeol(view->win);
1283 }
1284
1285 scrollok(view->win, FALSE);
1286 draw_ok = view->ops->draw(view, line, lineno, selected);
1287 scrollok(view->win, TRUE);
1288
1289 return draw_ok;
1290 }
1291
1292 static void
1293 redraw_view_from(struct view *view, int lineno)
1294 {
1295 assert(0 <= lineno && lineno < view->height);
1296
1297 for (; lineno < view->height; lineno++) {
1298 if (!draw_view_line(view, lineno))
1299 break;
1300 }
1301
1302 redrawwin(view->win);
1303 if (input_mode)
1304 wnoutrefresh(view->win);
1305 else
1306 wrefresh(view->win);
1307 }
1308
1309 static void
1310 redraw_view(struct view *view)
1311 {
1312 wclear(view->win);
1313 redraw_view_from(view, 0);
1314 }
1315
1316
1317 static void
1318 update_view_title(struct view *view)
1319 {
1320 char buf[SIZEOF_STR];
1321 char state[SIZEOF_STR];
1322 size_t bufpos = 0, statelen = 0;
1323
1324 assert(view_is_displayed(view));
1325
1326 if (view->lines || view->pipe) {
1327 unsigned int view_lines = view->offset + view->height;
1328 unsigned int lines = view->lines
1329 ? MIN(view_lines, view->lines) * 100 / view->lines
1330 : 0;
1331
1332 string_format_from(state, &statelen, "- %s %d of %d (%d%%)",
1333 view->ops->type,
1334 view->lineno + 1,
1335 view->lines,
1336 lines);
1337
1338 if (view->pipe) {
1339 time_t secs = time(NULL) - view->start_time;
1340
1341 /* Three git seconds are a long time ... */
1342 if (secs > 2)
1343 string_format_from(state, &statelen, " %lds", secs);
1344 }
1345 }
1346
1347 string_format_from(buf, &bufpos, "[%s]", view->name);
1348 if (*view->ref && bufpos < view->width) {
1349 size_t refsize = strlen(view->ref);
1350 size_t minsize = bufpos + 1 + /* abbrev= */ 7 + 1 + statelen;
1351
1352 if (minsize < view->width)
1353 refsize = view->width - minsize + 7;
1354 string_format_from(buf, &bufpos, " %.*s", refsize, view->ref);
1355 }
1356
1357 if (statelen && bufpos < view->width) {
1358 string_format_from(buf, &bufpos, " %s", state);
1359 }
1360
1361 if (view == display[current_view])
1362 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1363 else
1364 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1365
1366 mvwaddnstr(view->title, 0, 0, buf, bufpos);
1367 wclrtoeol(view->title);
1368 wmove(view->title, 0, view->width - 1);
1369
1370 if (input_mode)
1371 wnoutrefresh(view->title);
1372 else
1373 wrefresh(view->title);
1374 }
1375
1376 static void
1377 resize_display(void)
1378 {
1379 int offset, i;
1380 struct view *base = display[0];
1381 struct view *view = display[1] ? display[1] : display[0];
1382
1383 /* Setup window dimensions */
1384
1385 getmaxyx(stdscr, base->height, base->width);
1386
1387 /* Make room for the status window. */
1388 base->height -= 1;
1389
1390 if (view != base) {
1391 /* Horizontal split. */
1392 view->width = base->width;
1393 view->height = SCALE_SPLIT_VIEW(base->height);
1394 base->height -= view->height;
1395
1396 /* Make room for the title bar. */
1397 view->height -= 1;
1398 }
1399
1400 /* Make room for the title bar. */
1401 base->height -= 1;
1402
1403 offset = 0;
1404
1405 foreach_displayed_view (view, i) {
1406 if (!view->win) {
1407 view->win = newwin(view->height, 0, offset, 0);
1408 if (!view->win)
1409 die("Failed to create %s view", view->name);
1410
1411 scrollok(view->win, TRUE);
1412
1413 view->title = newwin(1, 0, offset + view->height, 0);
1414 if (!view->title)
1415 die("Failed to create title window");
1416
1417 } else {
1418 wresize(view->win, view->height, view->width);
1419 mvwin(view->win, offset, 0);
1420 mvwin(view->title, offset + view->height, 0);
1421 }
1422
1423 offset += view->height + 1;
1424 }
1425 }
1426
1427 static void
1428 redraw_display(void)
1429 {
1430 struct view *view;
1431 int i;
1432
1433 foreach_displayed_view (view, i) {
1434 redraw_view(view);
1435 update_view_title(view);
1436 }
1437 }
1438
1439 static void
1440 update_display_cursor(struct view *view)
1441 {
1442 /* Move the cursor to the right-most column of the cursor line.
1443 *
1444 * XXX: This could turn out to be a bit expensive, but it ensures that
1445 * the cursor does not jump around. */
1446 if (view->lines) {
1447 wmove(view->win, view->lineno - view->offset, view->width - 1);
1448 wrefresh(view->win);
1449 }
1450 }
1451
1452 /*
1453 * Navigation
1454 */
1455
1456 /* Scrolling backend */
1457 static void
1458 do_scroll_view(struct view *view, int lines)
1459 {
1460 bool redraw_current_line = FALSE;
1461
1462 /* The rendering expects the new offset. */
1463 view->offset += lines;
1464
1465 assert(0 <= view->offset && view->offset < view->lines);
1466 assert(lines);
1467
1468 /* Move current line into the view. */
1469 if (view->lineno < view->offset) {
1470 view->lineno = view->offset;
1471 redraw_current_line = TRUE;
1472 } else if (view->lineno >= view->offset + view->height) {
1473 view->lineno = view->offset + view->height - 1;
1474 redraw_current_line = TRUE;
1475 }
1476
1477 assert(view->offset <= view->lineno && view->lineno < view->lines);
1478
1479 /* Redraw the whole screen if scrolling is pointless. */
1480 if (view->height < ABS(lines)) {
1481 redraw_view(view);
1482
1483 } else {
1484 int line = lines > 0 ? view->height - lines : 0;
1485 int end = line + ABS(lines);
1486
1487 wscrl(view->win, lines);
1488
1489 for (; line < end; line++) {
1490 if (!draw_view_line(view, line))
1491 break;
1492 }
1493
1494 if (redraw_current_line)
1495 draw_view_line(view, view->lineno - view->offset);
1496 }
1497
1498 redrawwin(view->win);
1499 wrefresh(view->win);
1500 report("");
1501 }
1502
1503 /* Scroll frontend */
1504 static void
1505 scroll_view(struct view *view, enum request request)
1506 {
1507 int lines = 1;
1508
1509 assert(view_is_displayed(view));
1510
1511 switch (request) {
1512 case REQ_SCROLL_PAGE_DOWN:
1513 lines = view->height;
1514 case REQ_SCROLL_LINE_DOWN:
1515 if (view->offset + lines > view->lines)
1516 lines = view->lines - view->offset;
1517
1518 if (lines == 0 || view->offset + view->height >= view->lines) {
1519 report("Cannot scroll beyond the last line");
1520 return;
1521 }
1522 break;
1523
1524 case REQ_SCROLL_PAGE_UP:
1525 lines = view->height;
1526 case REQ_SCROLL_LINE_UP:
1527 if (lines > view->offset)
1528 lines = view->offset;
1529
1530 if (lines == 0) {
1531 report("Cannot scroll beyond the first line");
1532 return;
1533 }
1534
1535 lines = -lines;
1536 break;
1537
1538 default:
1539 die("request %d not handled in switch", request);
1540 }
1541
1542 do_scroll_view(view, lines);
1543 }
1544
1545 /* Cursor moving */
1546 static void
1547 move_view(struct view *view, enum request request)
1548 {
1549 int scroll_steps = 0;
1550 int steps;
1551
1552 switch (request) {
1553 case REQ_MOVE_FIRST_LINE:
1554 steps = -view->lineno;
1555 break;
1556
1557 case REQ_MOVE_LAST_LINE:
1558 steps = view->lines - view->lineno - 1;
1559 break;
1560
1561 case REQ_MOVE_PAGE_UP:
1562 steps = view->height > view->lineno
1563 ? -view->lineno : -view->height;
1564 break;
1565
1566 case REQ_MOVE_PAGE_DOWN:
1567 steps = view->lineno + view->height >= view->lines
1568 ? view->lines - view->lineno - 1 : view->height;
1569 break;
1570
1571 case REQ_MOVE_UP:
1572 steps = -1;
1573 break;
1574
1575 case REQ_MOVE_DOWN:
1576 steps = 1;
1577 break;
1578
1579 default:
1580 die("request %d not handled in switch", request);
1581 }
1582
1583 if (steps <= 0 && view->lineno == 0) {
1584 report("Cannot move beyond the first line");
1585 return;
1586
1587 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1588 report("Cannot move beyond the last line");
1589 return;
1590 }
1591
1592 /* Move the current line */
1593 view->lineno += steps;
1594 assert(0 <= view->lineno && view->lineno < view->lines);
1595
1596 /* Check whether the view needs to be scrolled */
1597 if (view->lineno < view->offset ||
1598 view->lineno >= view->offset + view->height) {
1599 scroll_steps = steps;
1600 if (steps < 0 && -steps > view->offset) {
1601 scroll_steps = -view->offset;
1602
1603 } else if (steps > 0) {
1604 if (view->lineno == view->lines - 1 &&
1605 view->lines > view->height) {
1606 scroll_steps = view->lines - view->offset - 1;
1607 if (scroll_steps >= view->height)
1608 scroll_steps -= view->height - 1;
1609 }
1610 }
1611 }
1612
1613 if (!view_is_displayed(view)) {
1614 view->offset += steps;
1615 view->ops->select(view, &view->line[view->lineno]);
1616 return;
1617 }
1618
1619 /* Repaint the old "current" line if we be scrolling */
1620 if (ABS(steps) < view->height)
1621 draw_view_line(view, view->lineno - steps - view->offset);
1622
1623 if (scroll_steps) {
1624 do_scroll_view(view, scroll_steps);
1625 return;
1626 }
1627
1628 /* Draw the current line */
1629 draw_view_line(view, view->lineno - view->offset);
1630
1631 redrawwin(view->win);
1632 wrefresh(view->win);
1633 report("");
1634 }
1635
1636
1637 /*
1638 * Searching
1639 */
1640
1641 static void search_view(struct view *view, enum request request);
1642
1643 static bool
1644 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1645 {
1646 assert(view_is_displayed(view));
1647
1648 if (!view->ops->grep(view, line))
1649 return FALSE;
1650
1651 if (lineno - view->offset >= view->height) {
1652 view->offset = lineno;
1653 view->lineno = lineno;
1654 redraw_view(view);
1655
1656 } else {
1657 unsigned long old_lineno = view->lineno - view->offset;
1658
1659 view->lineno = lineno;
1660 draw_view_line(view, old_lineno);
1661
1662 draw_view_line(view, view->lineno - view->offset);
1663 redrawwin(view->win);
1664 wrefresh(view->win);
1665 }
1666
1667 report("Line %ld matches '%s'", lineno + 1, view->grep);
1668 return TRUE;
1669 }
1670
1671 static void
1672 find_next(struct view *view, enum request request)
1673 {
1674 unsigned long lineno = view->lineno;
1675 int direction;
1676
1677 if (!*view->grep) {
1678 if (!*opt_search)
1679 report("No previous search");
1680 else
1681 search_view(view, request);
1682 return;
1683 }
1684
1685 switch (request) {
1686 case REQ_SEARCH:
1687 case REQ_FIND_NEXT:
1688 direction = 1;
1689 break;
1690
1691 case REQ_SEARCH_BACK:
1692 case REQ_FIND_PREV:
1693 direction = -1;
1694 break;
1695
1696 default:
1697 return;
1698 }
1699
1700 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1701 lineno += direction;
1702
1703 /* Note, lineno is unsigned long so will wrap around in which case it
1704 * will become bigger than view->lines. */
1705 for (; lineno < view->lines; lineno += direction) {
1706 struct line *line = &view->line[lineno];
1707
1708 if (find_next_line(view, lineno, line))
1709 return;
1710 }
1711
1712 report("No match found for '%s'", view->grep);
1713 }
1714
1715 static void
1716 search_view(struct view *view, enum request request)
1717 {
1718 int regex_err;
1719
1720 if (view->regex) {
1721 regfree(view->regex);
1722 *view->grep = 0;
1723 } else {
1724 view->regex = calloc(1, sizeof(*view->regex));
1725 if (!view->regex)
1726 return;
1727 }
1728
1729 regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
1730 if (regex_err != 0) {
1731 char buf[SIZEOF_STR] = "unknown error";
1732
1733 regerror(regex_err, view->regex, buf, sizeof(buf));
1734 report("Search failed: %s", buf);
1735 return;
1736 }
1737
1738 string_copy(view->grep, opt_search);
1739
1740 find_next(view, request);
1741 }
1742
1743 /*
1744 * Incremental updating
1745 */
1746
1747 static void
1748 end_update(struct view *view)
1749 {
1750 if (!view->pipe)
1751 return;
1752 set_nonblocking_input(FALSE);
1753 if (view->pipe == stdin)
1754 fclose(view->pipe);
1755 else
1756 pclose(view->pipe);
1757 view->pipe = NULL;
1758 }
1759
1760 static bool
1761 begin_update(struct view *view)
1762 {
1763 const char *id = view->id;
1764
1765 if (view->pipe)
1766 end_update(view);
1767
1768 if (opt_cmd[0]) {
1769 string_copy(view->cmd, opt_cmd);
1770 opt_cmd[0] = 0;
1771 /* When running random commands, the view ref could have become
1772 * invalid so clear it. */
1773 view->ref[0] = 0;
1774
1775 } else if (view == VIEW(REQ_VIEW_TREE)) {
1776 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1777
1778 if (strcmp(view->vid, view->id))
1779 opt_path[0] = 0;
1780
1781 if (!string_format(view->cmd, format, id, opt_path))
1782 return FALSE;
1783
1784 } else {
1785 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1786
1787 if (!string_format(view->cmd, format, id, id, id, id, id))
1788 return FALSE;
1789 }
1790
1791 /* Special case for the pager view. */
1792 if (opt_pipe) {
1793 view->pipe = opt_pipe;
1794 opt_pipe = NULL;
1795 } else {
1796 view->pipe = popen(view->cmd, "r");
1797 }
1798
1799 if (!view->pipe)
1800 return FALSE;
1801
1802 set_nonblocking_input(TRUE);
1803
1804 view->offset = 0;
1805 view->lines = 0;
1806 view->lineno = 0;
1807 string_copy(view->vid, id);
1808
1809 if (view->line) {
1810 int i;
1811
1812 for (i = 0; i < view->lines; i++)
1813 if (view->line[i].data)
1814 free(view->line[i].data);
1815
1816 free(view->line);
1817 view->line = NULL;
1818 }
1819
1820 view->start_time = time(NULL);
1821
1822 return TRUE;
1823 }
1824
1825 static struct line *
1826 realloc_lines(struct view *view, size_t line_size)
1827 {
1828 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1829
1830 if (!tmp)
1831 return NULL;
1832
1833 view->line = tmp;
1834 view->line_size = line_size;
1835 return view->line;
1836 }
1837
1838 static bool
1839 update_view(struct view *view)
1840 {
1841 char in_buffer[BUFSIZ];
1842 char out_buffer[BUFSIZ * 2];
1843 char *line;
1844 /* The number of lines to read. If too low it will cause too much
1845 * redrawing (and possible flickering), if too high responsiveness
1846 * will suffer. */
1847 unsigned long lines = view->height;
1848 int redraw_from = -1;
1849
1850 if (!view->pipe)
1851 return TRUE;
1852
1853 /* Only redraw if lines are visible. */
1854 if (view->offset + view->height >= view->lines)
1855 redraw_from = view->lines - view->offset;
1856
1857 /* FIXME: This is probably not perfect for backgrounded views. */
1858 if (!realloc_lines(view, view->lines + lines))
1859 goto alloc_error;
1860
1861 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1862 size_t linelen = strlen(line);
1863
1864 if (linelen)
1865 line[linelen - 1] = 0;
1866
1867 if (opt_iconv != ICONV_NONE) {
1868 char *inbuf = line;
1869 size_t inlen = linelen;
1870
1871 char *outbuf = out_buffer;
1872 size_t outlen = sizeof(out_buffer);
1873
1874 size_t ret;
1875
1876 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1877 if (ret != (size_t) -1) {
1878 line = out_buffer;
1879 linelen = strlen(out_buffer);
1880 }
1881 }
1882
1883 if (!view->ops->read(view, line))
1884 goto alloc_error;
1885
1886 if (lines-- == 1)
1887 break;
1888 }
1889
1890 {
1891 int digits;
1892
1893 lines = view->lines;
1894 for (digits = 0; lines; digits++)
1895 lines /= 10;
1896
1897 /* Keep the displayed view in sync with line number scaling. */
1898 if (digits != view->digits) {
1899 view->digits = digits;
1900 redraw_from = 0;
1901 }
1902 }
1903
1904 if (!view_is_displayed(view))
1905 goto check_pipe;
1906
1907 if (view == VIEW(REQ_VIEW_TREE)) {
1908 /* Clear the view and redraw everything since the tree sorting
1909 * might have rearranged things. */
1910 redraw_view(view);
1911
1912 } else if (redraw_from >= 0) {
1913 /* If this is an incremental update, redraw the previous line
1914 * since for commits some members could have changed when
1915 * loading the main view. */
1916 if (redraw_from > 0)
1917 redraw_from--;
1918
1919 /* Incrementally draw avoids flickering. */
1920 redraw_view_from(view, redraw_from);
1921 }
1922
1923 /* Update the title _after_ the redraw so that if the redraw picks up a
1924 * commit reference in view->ref it'll be available here. */
1925 update_view_title(view);
1926
1927 check_pipe:
1928 if (ferror(view->pipe)) {
1929 report("Failed to read: %s", strerror(errno));
1930 goto end;
1931
1932 } else if (feof(view->pipe)) {
1933 report("");
1934 goto end;
1935 }
1936
1937 return TRUE;
1938
1939 alloc_error:
1940 report("Allocation failure");
1941
1942 end:
1943 end_update(view);
1944 return FALSE;
1945 }
1946
1947
1948 /*
1949 * View opening
1950 */
1951
1952 static void open_help_view(struct view *view)
1953 {
1954 char buf[BUFSIZ];
1955 int lines = ARRAY_SIZE(req_info) + 2;
1956 int i;
1957
1958 if (view->lines > 0)
1959 return;
1960
1961 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1962 if (!req_info[i].request)
1963 lines++;
1964
1965 view->line = calloc(lines, sizeof(*view->line));
1966 if (!view->line) {
1967 report("Allocation failure");
1968 return;
1969 }
1970
1971 view->ops->read(view, "Quick reference for tig keybindings:");
1972
1973 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1974 char *key;
1975
1976 if (!req_info[i].request) {
1977 view->ops->read(view, "");
1978 view->ops->read(view, req_info[i].help);
1979 continue;
1980 }
1981
1982 key = get_key(req_info[i].request);
1983 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1984 continue;
1985
1986 view->ops->read(view, buf);
1987 }
1988 }
1989
1990 enum open_flags {
1991 OPEN_DEFAULT = 0, /* Use default view switching. */
1992 OPEN_SPLIT = 1, /* Split current view. */
1993 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1994 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1995 };
1996
1997 static void
1998 open_view(struct view *prev, enum request request, enum open_flags flags)
1999 {
2000 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
2001 bool split = !!(flags & OPEN_SPLIT);
2002 bool reload = !!(flags & OPEN_RELOAD);
2003 struct view *view = VIEW(request);
2004 int nviews = displayed_views();
2005 struct view *base_view = display[0];
2006
2007 if (view == prev && nviews == 1 && !reload) {
2008 report("Already in %s view", view->name);
2009 return;
2010 }
2011
2012 if (view == VIEW(REQ_VIEW_HELP)) {
2013 open_help_view(view);
2014
2015 } else if ((reload || strcmp(view->vid, view->id)) &&
2016 !begin_update(view)) {
2017 report("Failed to load %s view", view->name);
2018 return;
2019 }
2020
2021 if (split) {
2022 display[1] = view;
2023 if (!backgrounded)
2024 current_view = 1;
2025 } else {
2026 /* Maximize the current view. */
2027 memset(display, 0, sizeof(display));
2028 current_view = 0;
2029 display[current_view] = view;
2030 }
2031
2032 /* Resize the view when switching between split- and full-screen,
2033 * or when switching between two different full-screen views. */
2034 if (nviews != displayed_views() ||
2035 (nviews == 1 && base_view != display[0]))
2036 resize_display();
2037
2038 if (split && prev->lineno - prev->offset >= prev->height) {
2039 /* Take the title line into account. */
2040 int lines = prev->lineno - prev->offset - prev->height + 1;
2041
2042 /* Scroll the view that was split if the current line is
2043 * outside the new limited view. */
2044 do_scroll_view(prev, lines);
2045 }
2046
2047 if (prev && view != prev) {
2048 if (split && !backgrounded) {
2049 /* "Blur" the previous view. */
2050 update_view_title(prev);
2051 }
2052
2053 view->parent = prev;
2054 }
2055
2056 if (view->pipe && view->lines == 0) {
2057 /* Clear the old view and let the incremental updating refill
2058 * the screen. */
2059 wclear(view->win);
2060 report("");
2061 } else {
2062 redraw_view(view);
2063 report("");
2064 }
2065
2066 /* If the view is backgrounded the above calls to report()
2067 * won't redraw the view title. */
2068 if (backgrounded)
2069 update_view_title(view);
2070 }
2071
2072
2073 /*
2074 * User request switch noodle
2075 */
2076
2077 static int
2078 view_driver(struct view *view, enum request request)
2079 {
2080 int i;
2081
2082 switch (request) {
2083 case REQ_MOVE_UP:
2084 case REQ_MOVE_DOWN:
2085 case REQ_MOVE_PAGE_UP:
2086 case REQ_MOVE_PAGE_DOWN:
2087 case REQ_MOVE_FIRST_LINE:
2088 case REQ_MOVE_LAST_LINE:
2089 move_view(view, request);
2090 break;
2091
2092 case REQ_SCROLL_LINE_DOWN:
2093 case REQ_SCROLL_LINE_UP:
2094 case REQ_SCROLL_PAGE_DOWN:
2095 case REQ_SCROLL_PAGE_UP:
2096 scroll_view(view, request);
2097 break;
2098
2099 case REQ_VIEW_BLOB:
2100 if (!ref_blob[0]) {
2101 report("No file chosen, press 't' to open tree view");
2102 break;
2103 }
2104 /* Fall-through */
2105 case REQ_VIEW_MAIN:
2106 case REQ_VIEW_DIFF:
2107 case REQ_VIEW_LOG:
2108 case REQ_VIEW_TREE:
2109 case REQ_VIEW_HELP:
2110 case REQ_VIEW_PAGER:
2111 open_view(view, request, OPEN_DEFAULT);
2112 break;
2113
2114 case REQ_NEXT:
2115 case REQ_PREVIOUS:
2116 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2117
2118 if ((view == VIEW(REQ_VIEW_DIFF) &&
2119 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2120 (view == VIEW(REQ_VIEW_BLOB) &&
2121 view->parent == VIEW(REQ_VIEW_TREE))) {
2122 view = view->parent;
2123 move_view(view, request);
2124 if (view_is_displayed(view))
2125 update_view_title(view);
2126 } else {
2127 move_view(view, request);
2128 break;
2129 }
2130 /* Fall-through */
2131
2132 case REQ_ENTER:
2133 if (!view->lines) {
2134 report("Nothing to enter");
2135 break;
2136 }
2137 return view->ops->enter(view, &view->line[view->lineno]);
2138
2139 case REQ_VIEW_NEXT:
2140 {
2141 int nviews = displayed_views();
2142 int next_view = (current_view + 1) % nviews;
2143
2144 if (next_view == current_view) {
2145 report("Only one view is displayed");
2146 break;
2147 }
2148
2149 current_view = next_view;
2150 /* Blur out the title of the previous view. */
2151 update_view_title(view);
2152 report("");
2153 break;
2154 }
2155 case REQ_TOGGLE_LINENO:
2156 opt_line_number = !opt_line_number;
2157 redraw_display();
2158 break;
2159
2160 case REQ_TOGGLE_REV_GRAPH:
2161 opt_rev_graph = !opt_rev_graph;
2162 redraw_display();
2163 break;
2164
2165 case REQ_PROMPT:
2166 /* Always reload^Wrerun commands from the prompt. */
2167 open_view(view, opt_request, OPEN_RELOAD);
2168 break;
2169
2170 case REQ_SEARCH:
2171 case REQ_SEARCH_BACK:
2172 search_view(view, request);
2173 break;
2174
2175 case REQ_FIND_NEXT:
2176 case REQ_FIND_PREV:
2177 find_next(view, request);
2178 break;
2179
2180 case REQ_STOP_LOADING:
2181 for (i = 0; i < ARRAY_SIZE(views); i++) {
2182 view = &views[i];
2183 if (view->pipe)
2184 report("Stopped loading the %s view", view->name),
2185 end_update(view);
2186 }
2187 break;
2188
2189 case REQ_SHOW_VERSION:
2190 report("%s (built %s)", VERSION, __DATE__);
2191 return TRUE;
2192
2193 case REQ_SCREEN_RESIZE:
2194 resize_display();
2195 /* Fall-through */
2196 case REQ_SCREEN_REDRAW:
2197 redraw_display();
2198 break;
2199
2200 case REQ_NONE:
2201 doupdate();
2202 return TRUE;
2203
2204 case REQ_VIEW_CLOSE:
2205 /* XXX: Mark closed views by letting view->parent point to the
2206 * view itself. Parents to closed view should never be
2207 * followed. */
2208 if (view->parent &&
2209 view->parent->parent != view->parent) {
2210 memset(display, 0, sizeof(display));
2211 current_view = 0;
2212 display[current_view] = view->parent;
2213 view->parent = view;
2214 resize_display();
2215 redraw_display();
2216 break;
2217 }
2218 /* Fall-through */
2219 case REQ_QUIT:
2220 return FALSE;
2221
2222 default:
2223 /* An unknown key will show most commonly used commands. */
2224 report("Unknown key, press 'h' for help");
2225 return TRUE;
2226 }
2227
2228 return TRUE;
2229 }
2230
2231
2232 /*
2233 * Pager backend
2234 */
2235
2236 static bool
2237 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2238 {
2239 char *text = line->data;
2240 enum line_type type = line->type;
2241 int textlen = strlen(text);
2242 int attr;
2243
2244 wmove(view->win, lineno, 0);
2245
2246 if (selected) {
2247 type = LINE_CURSOR;
2248 wchgat(view->win, -1, 0, type, NULL);
2249 }
2250
2251 attr = get_line_attr(type);
2252 wattrset(view->win, attr);
2253
2254 if (opt_line_number || opt_tab_size < TABSIZE) {
2255 static char spaces[] = " ";
2256 int col_offset = 0, col = 0;
2257
2258 if (opt_line_number) {
2259 unsigned long real_lineno = view->offset + lineno + 1;
2260
2261 if (real_lineno == 1 ||
2262 (real_lineno % opt_num_interval) == 0) {
2263 wprintw(view->win, "%.*d", view->digits, real_lineno);
2264
2265 } else {
2266 waddnstr(view->win, spaces,
2267 MIN(view->digits, STRING_SIZE(spaces)));
2268 }
2269 waddstr(view->win, ": ");
2270 col_offset = view->digits + 2;
2271 }
2272
2273 while (text && col_offset + col < view->width) {
2274 int cols_max = view->width - col_offset - col;
2275 char *pos = text;
2276 int cols;
2277
2278 if (*text == '\t') {
2279 text++;
2280 assert(sizeof(spaces) > TABSIZE);
2281 pos = spaces;
2282 cols = opt_tab_size - (col % opt_tab_size);
2283
2284 } else {
2285 text = strchr(text, '\t');
2286 cols = line ? text - pos : strlen(pos);
2287 }
2288
2289 waddnstr(view->win, pos, MIN(cols, cols_max));
2290 col += cols;
2291 }
2292
2293 } else {
2294 int col = 0, pos = 0;
2295
2296 for (; pos < textlen && col < view->width; pos++, col++)
2297 if (text[pos] == '\t')
2298 col += TABSIZE - (col % TABSIZE) - 1;
2299
2300 waddnstr(view->win, text, pos);
2301 }
2302
2303 return TRUE;
2304 }
2305
2306 static bool
2307 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2308 {
2309 char refbuf[SIZEOF_STR];
2310 char *ref = NULL;
2311 FILE *pipe;
2312
2313 if (!string_format(refbuf, "git describe %s 2>/dev/null", commit_id))
2314 return TRUE;
2315
2316 pipe = popen(refbuf, "r");
2317 if (!pipe)
2318 return TRUE;
2319
2320 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2321 ref = chomp_string(ref);
2322 pclose(pipe);
2323
2324 if (!ref || !*ref)
2325 return TRUE;
2326
2327 /* This is the only fatal call, since it can "corrupt" the buffer. */
2328 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2329 return FALSE;
2330
2331 return TRUE;
2332 }
2333
2334 static void
2335 add_pager_refs(struct view *view, struct line *line)
2336 {
2337 char buf[SIZEOF_STR];
2338 char *commit_id = line->data + STRING_SIZE("commit ");
2339 struct ref **refs;
2340 size_t bufpos = 0, refpos = 0;
2341 const char *sep = "Refs: ";
2342 bool is_tag = FALSE;
2343
2344 assert(line->type == LINE_COMMIT);
2345
2346 refs = get_refs(commit_id);
2347 if (!refs) {
2348 if (view == VIEW(REQ_VIEW_DIFF))
2349 goto try_add_describe_ref;
2350 return;
2351 }
2352
2353 do {
2354 struct ref *ref = refs[refpos];
2355 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2356
2357 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2358 return;
2359 sep = ", ";
2360 if (ref->tag)
2361 is_tag = TRUE;
2362 } while (refs[refpos++]->next);
2363
2364 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2365 try_add_describe_ref:
2366 /* Add <tag>-g<commit_id> "fake" reference. */
2367 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2368 return;
2369 }
2370
2371 if (bufpos == 0)
2372 return;
2373
2374 if (!realloc_lines(view, view->line_size + 1))
2375 return;
2376
2377 line = &view->line[view->lines];
2378 line->data = strdup(buf);
2379 if (!line->data)
2380 return;
2381
2382 line->type = LINE_PP_REFS;
2383 view->lines++;
2384 }
2385
2386 static bool
2387 pager_read(struct view *view, char *data)
2388 {
2389 struct line *line = &view->line[view->lines];
2390
2391 line->data = strdup(data);
2392 if (!line->data)
2393 return FALSE;
2394
2395 line->type = get_line_type(line->data);
2396 view->lines++;
2397
2398 if (line->type == LINE_COMMIT &&
2399 (view == VIEW(REQ_VIEW_DIFF) ||
2400 view == VIEW(REQ_VIEW_LOG)))
2401 add_pager_refs(view, line);
2402
2403 return TRUE;
2404 }
2405
2406 static bool
2407 pager_enter(struct view *view, struct line *line)
2408 {
2409 int split = 0;
2410
2411 if (line->type == LINE_COMMIT &&
2412 (view == VIEW(REQ_VIEW_LOG) ||
2413 view == VIEW(REQ_VIEW_PAGER))) {
2414 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2415 split = 1;
2416 }
2417
2418 /* Always scroll the view even if it was split. That way
2419 * you can use Enter to scroll through the log view and
2420 * split open each commit diff. */
2421 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2422
2423 /* FIXME: A minor workaround. Scrolling the view will call report("")
2424 * but if we are scrolling a non-current view this won't properly
2425 * update the view title. */
2426 if (split)
2427 update_view_title(view);
2428
2429 return TRUE;
2430 }
2431
2432 static bool
2433 pager_grep(struct view *view, struct line *line)
2434 {
2435 regmatch_t pmatch;
2436 char *text = line->data;
2437
2438 if (!*text)
2439 return FALSE;
2440
2441 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2442 return FALSE;
2443
2444 return TRUE;
2445 }
2446
2447 static void
2448 pager_select(struct view *view, struct line *line)
2449 {
2450 if (line->type == LINE_COMMIT) {
2451 char *text = line->data;
2452
2453 string_copy(view->ref, text + STRING_SIZE("commit "));
2454 string_copy(ref_commit, view->ref);
2455 }
2456 }
2457
2458 static struct view_ops pager_ops = {
2459 "line",
2460 pager_draw,
2461 pager_read,
2462 pager_enter,
2463 pager_grep,
2464 pager_select,
2465 };
2466
2467
2468 /*
2469 * Tree backend
2470 */
2471
2472 /* Parse output from git-ls-tree(1):
2473 *
2474 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2475 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2476 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2477 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2478 */
2479
2480 #define SIZEOF_TREE_ATTR \
2481 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2482
2483 #define TREE_UP_FORMAT "040000 tree %s\t.."
2484
2485 static int
2486 tree_compare_entry(enum line_type type1, char *name1,
2487 enum line_type type2, char *name2)
2488 {
2489 if (type1 != type2) {
2490 if (type1 == LINE_TREE_DIR)
2491 return -1;
2492 return 1;
2493 }
2494
2495 return strcmp(name1, name2);
2496 }
2497
2498 static bool
2499 tree_read(struct view *view, char *text)
2500 {
2501 size_t textlen = strlen(text);
2502 char buf[SIZEOF_STR];
2503 unsigned long pos;
2504 enum line_type type;
2505 bool first_read = view->lines == 0;
2506
2507 if (textlen <= SIZEOF_TREE_ATTR)
2508 return FALSE;
2509
2510 type = text[STRING_SIZE("100644 ")] == 't'
2511 ? LINE_TREE_DIR : LINE_TREE_FILE;
2512
2513 if (first_read) {
2514 /* Add path info line */
2515 if (string_format(buf, "Directory path /%s", opt_path) &&
2516 realloc_lines(view, view->line_size + 1) &&
2517 pager_read(view, buf))
2518 view->line[view->lines - 1].type = LINE_DEFAULT;
2519 else
2520 return FALSE;
2521
2522 /* Insert "link" to parent directory. */
2523 if (*opt_path &&
2524 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2525 realloc_lines(view, view->line_size + 1) &&
2526 pager_read(view, buf))
2527 view->line[view->lines - 1].type = LINE_TREE_DIR;
2528 else if (*opt_path)
2529 return FALSE;
2530 }
2531
2532 /* Strip the path part ... */
2533 if (*opt_path) {
2534 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2535 size_t striplen = strlen(opt_path);
2536 char *path = text + SIZEOF_TREE_ATTR;
2537
2538 if (pathlen > striplen)
2539 memmove(path, path + striplen,
2540 pathlen - striplen + 1);
2541 }
2542
2543 /* Skip "Directory ..." and ".." line. */
2544 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2545 struct line *line = &view->line[pos];
2546 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2547 char *path2 = text + SIZEOF_TREE_ATTR;
2548 int cmp = tree_compare_entry(line->type, path1, type, path2);
2549
2550 if (cmp <= 0)
2551 continue;
2552
2553 text = strdup(text);
2554 if (!text)
2555 return FALSE;
2556
2557 if (view->lines > pos)
2558 memmove(&view->line[pos + 1], &view->line[pos],
2559 (view->lines - pos) * sizeof(*line));
2560
2561 line = &view->line[pos];
2562 line->data = text;
2563 line->type = type;
2564 view->lines++;
2565 return TRUE;
2566 }
2567
2568 if (!pager_read(view, text))
2569 return FALSE;
2570
2571 /* Move the current line to the first tree entry. */
2572 if (first_read)
2573 view->lineno++;
2574
2575 view->line[view->lines - 1].type = type;
2576 return TRUE;
2577 }
2578
2579 static bool
2580 tree_enter(struct view *view, struct line *line)
2581 {
2582 enum open_flags flags;
2583 enum request request;
2584
2585 switch (line->type) {
2586 case LINE_TREE_DIR:
2587 /* Depending on whether it is a subdir or parent (updir?) link
2588 * mangle the path buffer. */
2589 if (line == &view->line[1] && *opt_path) {
2590 size_t path_len = strlen(opt_path);
2591 char *dirsep = opt_path + path_len - 1;
2592
2593 while (dirsep > opt_path && dirsep[-1] != '/')
2594 dirsep--;
2595
2596 dirsep[0] = 0;
2597
2598 } else {
2599 size_t pathlen = strlen(opt_path);
2600 size_t origlen = pathlen;
2601 char *data = line->data;
2602 char *basename = data + SIZEOF_TREE_ATTR;
2603
2604 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2605 opt_path[origlen] = 0;
2606 return TRUE;
2607 }
2608 }
2609
2610 /* Trees and subtrees share the same ID, so they are not not
2611 * unique like blobs. */
2612 flags = OPEN_RELOAD;
2613 request = REQ_VIEW_TREE;
2614 break;
2615
2616 case LINE_TREE_FILE:
2617 flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2618 request = REQ_VIEW_BLOB;
2619 break;
2620
2621 default:
2622 return TRUE;
2623 }
2624
2625 open_view(view, request, flags);
2626
2627 return TRUE;
2628 }
2629
2630 static void
2631 tree_select(struct view *view, struct line *line)
2632 {
2633 char *text = line->data;
2634
2635 text += STRING_SIZE("100644 blob ");
2636
2637 if (line->type == LINE_TREE_FILE) {
2638 string_ncopy(ref_blob, text, 40);
2639 /* Also update the blob view's ref, since all there must always
2640 * be in sync. */
2641 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2642
2643 } else if (line->type != LINE_TREE_DIR) {
2644 return;
2645 }
2646
2647 string_ncopy(view->ref, text, 40);
2648 }
2649
2650 static struct view_ops tree_ops = {
2651 "file",
2652 pager_draw,
2653 tree_read,
2654 tree_enter,
2655 pager_grep,
2656 tree_select,
2657 };
2658
2659 static bool
2660 blob_read(struct view *view, char *line)
2661 {
2662 bool state = pager_read(view, line);
2663
2664 if (state == TRUE)
2665 view->line[view->lines - 1].type = LINE_DEFAULT;
2666
2667 return state;
2668 }
2669
2670 static struct view_ops blob_ops = {
2671 "line",
2672 pager_draw,
2673 blob_read,
2674 pager_enter,
2675 pager_grep,
2676 pager_select,
2677 };
2678
2679
2680 /*
2681 * Main view backend
2682 */
2683
2684 struct commit {
2685 char id[SIZEOF_REV]; /* SHA1 ID. */
2686 char title[128]; /* First line of the commit message. */
2687 char author[75]; /* Author of the commit. */
2688 struct tm time; /* Date from the author ident. */
2689 struct ref **refs; /* Repository references. */
2690 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2691 size_t graph_size; /* The width of the graph array. */
2692 };
2693
2694 static bool
2695 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2696 {
2697 char buf[DATE_COLS + 1];
2698 struct commit *commit = line->data;
2699 enum line_type type;
2700 int col = 0;
2701 size_t timelen;
2702 size_t authorlen;
2703 int trimmed = 1;
2704
2705 if (!*commit->author)
2706 return FALSE;
2707
2708 wmove(view->win, lineno, col);
2709
2710 if (selected) {
2711 type = LINE_CURSOR;
2712 wattrset(view->win, get_line_attr(type));
2713 wchgat(view->win, -1, 0, type, NULL);
2714
2715 } else {
2716 type = LINE_MAIN_COMMIT;
2717 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2718 }
2719
2720 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2721 waddnstr(view->win, buf, timelen);
2722 waddstr(view->win, " ");
2723
2724 col += DATE_COLS;
2725 wmove(view->win, lineno, col);
2726 if (type != LINE_CURSOR)
2727 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2728
2729 if (opt_utf8) {
2730 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2731 } else {
2732 authorlen = strlen(commit->author);
2733 if (authorlen > AUTHOR_COLS - 2) {
2734 authorlen = AUTHOR_COLS - 2;
2735 trimmed = 1;
2736 }
2737 }
2738
2739 if (trimmed) {
2740 waddnstr(view->win, commit->author, authorlen);
2741 if (type != LINE_CURSOR)
2742 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2743 waddch(view->win, '~');
2744 } else {
2745 waddstr(view->win, commit->author);
2746 }
2747
2748 col += AUTHOR_COLS;
2749 if (type != LINE_CURSOR)
2750 wattrset(view->win, A_NORMAL);
2751
2752 if (opt_rev_graph && commit->graph_size) {
2753 size_t i;
2754
2755 wmove(view->win, lineno, col);
2756 /* Using waddch() instead of waddnstr() ensures that
2757 * they'll be rendered correctly for the cursor line. */
2758 for (i = 0; i < commit->graph_size; i++)
2759 waddch(view->win, commit->graph[i]);
2760
2761 col += commit->graph_size + 1;
2762 }
2763
2764 wmove(view->win, lineno, col);
2765
2766 if (commit->refs) {
2767 size_t i = 0;
2768
2769 do {
2770 if (type == LINE_CURSOR)
2771 ;
2772 else if (commit->refs[i]->tag)
2773 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2774 else
2775 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2776 waddstr(view->win, "[");
2777 waddstr(view->win, commit->refs[i]->name);
2778 waddstr(view->win, "]");
2779 if (type != LINE_CURSOR)
2780 wattrset(view->win, A_NORMAL);
2781 waddstr(view->win, " ");
2782 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2783 } while (commit->refs[i++]->next);
2784 }
2785
2786 if (type != LINE_CURSOR)
2787 wattrset(view->win, get_line_attr(type));
2788
2789 {
2790 int titlelen = strlen(commit->title);
2791
2792 if (col + titlelen > view->width)
2793 titlelen = view->width - col;
2794
2795 waddnstr(view->win, commit->title, titlelen);
2796 }
2797
2798 return TRUE;
2799 }
2800
2801 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2802 static bool
2803 main_read(struct view *view, char *line)
2804 {
2805 enum line_type type = get_line_type(line);
2806 struct commit *commit = view->lines
2807 ? view->line[view->lines - 1].data : NULL;
2808
2809 switch (type) {
2810 case LINE_COMMIT:
2811 commit = calloc(1, sizeof(struct commit));
2812 if (!commit)
2813 return FALSE;
2814
2815 line += STRING_SIZE("commit ");
2816
2817 view->line[view->lines++].data = commit;
2818 string_copy(commit->id, line);
2819 commit->refs = get_refs(commit->id);
2820 commit->graph[commit->graph_size++] = ACS_LTEE;
2821 break;
2822
2823 case LINE_AUTHOR:
2824 {
2825 /* Parse author lines where the name may be empty:
2826 * author <email@address.tld> 1138474660 +0100
2827 */
2828 char *ident = line + STRING_SIZE("author ");
2829 char *nameend = strchr(ident, '<');
2830 char *emailend = strchr(ident, '>');
2831
2832 if (!commit || !nameend || !emailend)
2833 break;
2834
2835 *nameend = *emailend = 0;
2836 ident = chomp_string(ident);
2837 if (!*ident) {
2838 ident = chomp_string(nameend + 1);
2839 if (!*ident)
2840 ident = "Unknown";
2841 }
2842
2843 string_copy(commit->author, ident);
2844
2845 /* Parse epoch and timezone */
2846 if (emailend[1] == ' ') {
2847 char *secs = emailend + 2;
2848 char *zone = strchr(secs, ' ');
2849 time_t time = (time_t) atol(secs);
2850
2851 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2852 long tz;
2853
2854 zone++;
2855 tz = ('0' - zone[1]) * 60 * 60 * 10;
2856 tz += ('0' - zone[2]) * 60 * 60;
2857 tz += ('0' - zone[3]) * 60;
2858 tz += ('0' - zone[4]) * 60;
2859
2860 if (zone[0] == '-')
2861 tz = -tz;
2862
2863 time -= tz;
2864 }
2865
2866 gmtime_r(&time, &commit->time);
2867 }
2868 break;
2869 }
2870 default:
2871 if (!commit)
2872 break;
2873
2874 /* Fill in the commit title if it has not already been set. */
2875 if (commit->title[0])
2876 break;
2877
2878 /* Require titles to start with a non-space character at the
2879 * offset used by git log. */
2880 if (strncmp(line, " ", 4))
2881 break;
2882 line += 4;
2883 /* Well, if the title starts with a whitespace character,
2884 * try to be forgiving. Otherwise we end up with no title. */
2885 while (isspace(*line))
2886 line++;
2887 if (*line == '\0')
2888 break;
2889 /* FIXME: More graceful handling of titles; append "..." to
2890 * shortened titles, etc. */
2891
2892 string_copy(commit->title, line);
2893 }
2894
2895 return TRUE;
2896 }
2897
2898 static bool
2899 main_enter(struct view *view, struct line *line)
2900 {
2901 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2902
2903 open_view(view, REQ_VIEW_DIFF, flags);
2904 return TRUE;
2905 }
2906
2907 static bool
2908 main_grep(struct view *view, struct line *line)
2909 {
2910 struct commit *commit = line->data;
2911 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
2912 char buf[DATE_COLS + 1];
2913 regmatch_t pmatch;
2914
2915 for (state = S_TITLE; state < S_END; state++) {
2916 char *text;
2917
2918 switch (state) {
2919 case S_TITLE: text = commit->title; break;
2920 case S_AUTHOR: text = commit->author; break;
2921 case S_DATE:
2922 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
2923 continue;
2924 text = buf;
2925 break;
2926
2927 default:
2928 return FALSE;
2929 }
2930
2931 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
2932 return TRUE;
2933 }
2934
2935 return FALSE;
2936 }
2937
2938 static void
2939 main_select(struct view *view, struct line *line)
2940 {
2941 struct commit *commit = line->data;
2942
2943 string_copy(view->ref, commit->id);
2944 string_copy(ref_commit, view->ref);
2945 }
2946
2947 static struct view_ops main_ops = {
2948 "commit",
2949 main_draw,
2950 main_read,
2951 main_enter,
2952 main_grep,
2953 main_select,
2954 };
2955
2956
2957 /*
2958 * Unicode / UTF-8 handling
2959 *
2960 * NOTE: Much of the following code for dealing with unicode is derived from
2961 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2962 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2963 */
2964
2965 /* I've (over)annotated a lot of code snippets because I am not entirely
2966 * confident that the approach taken by this small UTF-8 interface is correct.
2967 * --jonas */
2968
2969 static inline int
2970 unicode_width(unsigned long c)
2971 {
2972 if (c >= 0x1100 &&
2973 (c <= 0x115f /* Hangul Jamo */
2974 || c == 0x2329
2975 || c == 0x232a
2976 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2977 /* CJK ... Yi */
2978 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2979 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2980 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2981 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2982 || (c >= 0xffe0 && c <= 0xffe6)
2983 || (c >= 0x20000 && c <= 0x2fffd)
2984 || (c >= 0x30000 && c <= 0x3fffd)))
2985 return 2;
2986
2987 return 1;
2988 }
2989
2990 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2991 * Illegal bytes are set one. */
2992 static const unsigned char utf8_bytes[256] = {
2993 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,
2994 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,
2995 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,
2996 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,
2997 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,
2998 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,
2999 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,
3000 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,
3001 };
3002
3003 /* Decode UTF-8 multi-byte representation into a unicode character. */
3004 static inline unsigned long
3005 utf8_to_unicode(const char *string, size_t length)
3006 {
3007 unsigned long unicode;
3008
3009 switch (length) {
3010 case 1:
3011 unicode = string[0];
3012 break;
3013 case 2:
3014 unicode = (string[0] & 0x1f) << 6;
3015 unicode += (string[1] & 0x3f);
3016 break;
3017 case 3:
3018 unicode = (string[0] & 0x0f) << 12;
3019 unicode += ((string[1] & 0x3f) << 6);
3020 unicode += (string[2] & 0x3f);
3021 break;
3022 case 4:
3023 unicode = (string[0] & 0x0f) << 18;
3024 unicode += ((string[1] & 0x3f) << 12);
3025 unicode += ((string[2] & 0x3f) << 6);
3026 unicode += (string[3] & 0x3f);
3027 break;
3028 case 5:
3029 unicode = (string[0] & 0x0f) << 24;
3030 unicode += ((string[1] & 0x3f) << 18);
3031 unicode += ((string[2] & 0x3f) << 12);
3032 unicode += ((string[3] & 0x3f) << 6);
3033 unicode += (string[4] & 0x3f);
3034 break;
3035 case 6:
3036 unicode = (string[0] & 0x01) << 30;
3037 unicode += ((string[1] & 0x3f) << 24);
3038 unicode += ((string[2] & 0x3f) << 18);
3039 unicode += ((string[3] & 0x3f) << 12);
3040 unicode += ((string[4] & 0x3f) << 6);
3041 unicode += (string[5] & 0x3f);
3042 break;
3043 default:
3044 die("Invalid unicode length");
3045 }
3046
3047 /* Invalid characters could return the special 0xfffd value but NUL
3048 * should be just as good. */
3049 return unicode > 0xffff ? 0 : unicode;
3050 }
3051
3052 /* Calculates how much of string can be shown within the given maximum width
3053 * and sets trimmed parameter to non-zero value if all of string could not be
3054 * shown.
3055 *
3056 * Additionally, adds to coloffset how many many columns to move to align with
3057 * the expected position. Takes into account how multi-byte and double-width
3058 * characters will effect the cursor position.
3059 *
3060 * Returns the number of bytes to output from string to satisfy max_width. */
3061 static size_t
3062 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3063 {
3064 const char *start = string;
3065 const char *end = strchr(string, '\0');
3066 size_t mbwidth = 0;
3067 size_t width = 0;
3068
3069 *trimmed = 0;
3070
3071 while (string < end) {
3072 int c = *(unsigned char *) string;
3073 unsigned char bytes = utf8_bytes[c];
3074 size_t ucwidth;
3075 unsigned long unicode;
3076
3077 if (string + bytes > end)
3078 break;
3079
3080 /* Change representation to figure out whether
3081 * it is a single- or double-width character. */
3082
3083 unicode = utf8_to_unicode(string, bytes);
3084 /* FIXME: Graceful handling of invalid unicode character. */
3085 if (!unicode)
3086 break;
3087
3088 ucwidth = unicode_width(unicode);
3089 width += ucwidth;
3090 if (width > max_width) {
3091 *trimmed = 1;
3092 break;
3093 }
3094
3095 /* The column offset collects the differences between the
3096 * number of bytes encoding a character and the number of
3097 * columns will be used for rendering said character.
3098 *
3099 * So if some character A is encoded in 2 bytes, but will be
3100 * represented on the screen using only 1 byte this will and up
3101 * adding 1 to the multi-byte column offset.
3102 *
3103 * Assumes that no double-width character can be encoding in
3104 * less than two bytes. */
3105 if (bytes > ucwidth)
3106 mbwidth += bytes - ucwidth;
3107
3108 string += bytes;
3109 }
3110
3111 *coloffset += mbwidth;
3112
3113 return string - start;
3114 }
3115
3116
3117 /*
3118 * Status management
3119 */
3120
3121 /* Whether or not the curses interface has been initialized. */
3122 static bool cursed = FALSE;
3123
3124 /* The status window is used for polling keystrokes. */
3125 static WINDOW *status_win;
3126
3127 static bool status_empty = TRUE;
3128
3129 /* Update status and title window. */
3130 static void
3131 report(const char *msg, ...)
3132 {
3133 struct view *view = display[current_view];
3134
3135 if (input_mode)
3136 return;
3137
3138 if (!status_empty || *msg) {
3139 va_list args;
3140
3141 va_start(args, msg);
3142
3143 wmove(status_win, 0, 0);
3144 if (*msg) {
3145 vwprintw(status_win, msg, args);
3146 status_empty = FALSE;
3147 } else {
3148 status_empty = TRUE;
3149 }
3150 wclrtoeol(status_win);
3151 wrefresh(status_win);
3152
3153 va_end(args);
3154 }
3155
3156 update_view_title(view);
3157 update_display_cursor(view);
3158 }
3159
3160 /* Controls when nodelay should be in effect when polling user input. */
3161 static void
3162 set_nonblocking_input(bool loading)
3163 {
3164 static unsigned int loading_views;
3165
3166 if ((loading == FALSE && loading_views-- == 1) ||
3167 (loading == TRUE && loading_views++ == 0))
3168 nodelay(status_win, loading);
3169 }
3170
3171 static void
3172 init_display(void)
3173 {
3174 int x, y;
3175
3176 /* Initialize the curses library */
3177 if (isatty(STDIN_FILENO)) {
3178 cursed = !!initscr();
3179 } else {
3180 /* Leave stdin and stdout alone when acting as a pager. */
3181 FILE *io = fopen("/dev/tty", "r+");
3182
3183 if (!io)
3184 die("Failed to open /dev/tty");
3185 cursed = !!newterm(NULL, io, io);
3186 }
3187
3188 if (!cursed)
3189 die("Failed to initialize curses");
3190
3191 nonl(); /* Tell curses not to do NL->CR/NL on output */
3192 cbreak(); /* Take input chars one at a time, no wait for \n */
3193 noecho(); /* Don't echo input */
3194 leaveok(stdscr, TRUE);
3195
3196 if (has_colors())
3197 init_colors();
3198
3199 getmaxyx(stdscr, y, x);
3200 status_win = newwin(1, 0, y - 1, 0);
3201 if (!status_win)
3202 die("Failed to create status window");
3203
3204 /* Enable keyboard mapping */
3205 keypad(status_win, TRUE);
3206 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3207 }
3208
3209 static char *
3210 read_prompt(const char *prompt)
3211 {
3212 enum { READING, STOP, CANCEL } status = READING;
3213 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3214 int pos = 0;
3215
3216 while (status == READING) {
3217 struct view *view;
3218 int i, key;
3219
3220 input_mode = TRUE;
3221
3222 foreach_view (view, i)
3223 update_view(view);
3224
3225 input_mode = FALSE;
3226
3227 mvwprintw(status_win, 0, 0, "%s%.*s", prompt, pos, buf);
3228 wclrtoeol(status_win);
3229
3230 /* Refresh, accept single keystroke of input */
3231 key = wgetch(status_win);
3232 switch (key) {
3233 case KEY_RETURN:
3234 case KEY_ENTER:
3235 case '\n':
3236 status = pos ? STOP : CANCEL;
3237 break;
3238
3239 case KEY_BACKSPACE:
3240 if (pos > 0)
3241 pos--;
3242 else
3243 status = CANCEL;
3244 break;
3245
3246 case KEY_ESC:
3247 status = CANCEL;
3248 break;
3249
3250 case ERR:
3251 break;
3252
3253 default:
3254 if (pos >= sizeof(buf)) {
3255 report("Input string too long");
3256 return NULL;
3257 }
3258
3259 if (isprint(key))
3260 buf[pos++] = (char) key;
3261 }
3262 }
3263
3264 /* Clear the status window */
3265 status_empty = FALSE;
3266 report("");
3267
3268 if (status == CANCEL)
3269 return NULL;
3270
3271 buf[pos++] = 0;
3272
3273 return buf;
3274 }
3275
3276 /*
3277 * Repository references
3278 */
3279
3280 static struct ref *refs;
3281 static size_t refs_size;
3282
3283 /* Id <-> ref store */
3284 static struct ref ***id_refs;
3285 static size_t id_refs_size;
3286
3287 static struct ref **
3288 get_refs(char *id)
3289 {
3290 struct ref ***tmp_id_refs;
3291 struct ref **ref_list = NULL;
3292 size_t ref_list_size = 0;
3293 size_t i;
3294
3295 for (i = 0; i < id_refs_size; i++)
3296 if (!strcmp(id, id_refs[i][0]->id))
3297 return id_refs[i];
3298
3299 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3300 if (!tmp_id_refs)
3301 return NULL;
3302
3303 id_refs = tmp_id_refs;
3304
3305 for (i = 0; i < refs_size; i++) {
3306 struct ref **tmp;
3307
3308 if (strcmp(id, refs[i].id))
3309 continue;
3310
3311 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3312 if (!tmp) {
3313 if (ref_list)
3314 free(ref_list);
3315 return NULL;
3316 }
3317
3318 ref_list = tmp;
3319 if (ref_list_size > 0)
3320 ref_list[ref_list_size - 1]->next = 1;
3321 ref_list[ref_list_size] = &refs[i];
3322
3323 /* XXX: The properties of the commit chains ensures that we can
3324 * safely modify the shared ref. The repo references will
3325 * always be similar for the same id. */
3326 ref_list[ref_list_size]->next = 0;
3327 ref_list_size++;
3328 }
3329
3330 if (ref_list)
3331 id_refs[id_refs_size++] = ref_list;
3332
3333 return ref_list;
3334 }
3335
3336 static int
3337 read_ref(char *id, int idlen, char *name, int namelen)
3338 {
3339 struct ref *ref;
3340 bool tag = FALSE;
3341
3342 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3343 /* Commits referenced by tags has "^{}" appended. */
3344 if (name[namelen - 1] != '}')
3345 return OK;
3346
3347 while (namelen > 0 && name[namelen] != '^')
3348 namelen--;
3349
3350 tag = TRUE;
3351 namelen -= STRING_SIZE("refs/tags/");
3352 name += STRING_SIZE("refs/tags/");
3353
3354 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3355 namelen -= STRING_SIZE("refs/heads/");
3356 name += STRING_SIZE("refs/heads/");
3357
3358 } else if (!strcmp(name, "HEAD")) {
3359 return OK;
3360 }
3361
3362 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3363 if (!refs)
3364 return ERR;
3365
3366 ref = &refs[refs_size++];
3367 ref->name = malloc(namelen + 1);
3368 if (!ref->name)
3369 return ERR;
3370
3371 strncpy(ref->name, name, namelen);
3372 ref->name[namelen] = 0;
3373 ref->tag = tag;
3374 string_copy(ref->id, id);
3375
3376 return OK;
3377 }
3378
3379 static int
3380 load_refs(void)
3381 {
3382 const char *cmd_env = getenv("TIG_LS_REMOTE");
3383 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3384
3385 return read_properties(popen(cmd, "r"), "\t", read_ref);
3386 }
3387
3388 static int
3389 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3390 {
3391 if (!strcmp(name, "i18n.commitencoding"))
3392 string_copy(opt_encoding, value);
3393
3394 return OK;
3395 }
3396
3397 static int
3398 load_repo_config(void)
3399 {
3400 return read_properties(popen("git repo-config --list", "r"),
3401 "=", read_repo_config_option);
3402 }
3403
3404 static int
3405 read_properties(FILE *pipe, const char *separators,
3406 int (*read_property)(char *, int, char *, int))
3407 {
3408 char buffer[BUFSIZ];
3409 char *name;
3410 int state = OK;
3411
3412 if (!pipe)
3413 return ERR;
3414
3415 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3416 char *value;
3417 size_t namelen;
3418 size_t valuelen;
3419
3420 name = chomp_string(name);
3421 namelen = strcspn(name, separators);
3422
3423 if (name[namelen]) {
3424 name[namelen] = 0;
3425 value = chomp_string(name + namelen + 1);
3426 valuelen = strlen(value);
3427
3428 } else {
3429 value = "";
3430 valuelen = 0;
3431 }
3432
3433 state = read_property(name, namelen, value, valuelen);
3434 }
3435
3436 if (state != ERR && ferror(pipe))
3437 state = ERR;
3438
3439 pclose(pipe);
3440
3441 return state;
3442 }
3443
3444
3445 /*
3446 * Main
3447 */
3448
3449 static void __NORETURN
3450 quit(int sig)
3451 {
3452 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3453 if (cursed)
3454 endwin();
3455 exit(0);
3456 }
3457
3458 static void __NORETURN
3459 die(const char *err, ...)
3460 {
3461 va_list args;
3462
3463 endwin();
3464
3465 va_start(args, err);
3466 fputs("tig: ", stderr);
3467 vfprintf(stderr, err, args);
3468 fputs("\n", stderr);
3469 va_end(args);
3470
3471 exit(1);
3472 }
3473
3474 int
3475 main(int argc, char *argv[])
3476 {
3477 struct view *view;
3478 enum request request;
3479 size_t i;
3480
3481 signal(SIGINT, quit);
3482
3483 if (setlocale(LC_ALL, "")) {
3484 string_copy(opt_codeset, nl_langinfo(CODESET));
3485 }
3486
3487 if (load_options() == ERR)
3488 die("Failed to load user config.");
3489
3490 /* Load the repo config file so options can be overwritten from
3491 * the command line. */
3492 if (load_repo_config() == ERR)
3493 die("Failed to load repo config.");
3494
3495 if (!parse_options(argc, argv))
3496 return 0;
3497
3498 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3499 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3500 if (opt_iconv == ICONV_NONE)
3501 die("Failed to initialize character set conversion");
3502 }
3503
3504 if (load_refs() == ERR)
3505 die("Failed to load refs.");
3506
3507 /* Require a git repository unless when running in pager mode. */
3508 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3509 die("Not a git repository");
3510
3511 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3512 view->cmd_env = getenv(view->cmd_env);
3513
3514 request = opt_request;
3515
3516 init_display();
3517
3518 while (view_driver(display[current_view], request)) {
3519 int key;
3520 int i;
3521
3522 foreach_view (view, i)
3523 update_view(view);
3524
3525 /* Refresh, accept single keystroke of input */
3526 key = wgetch(status_win);
3527
3528 /* wgetch() with nodelay() enabled returns ERR when there's no
3529 * input. */
3530 if (key == ERR) {
3531 request = REQ_NONE;
3532 continue;
3533 }
3534
3535 request = get_keybinding(display[current_view]->keymap, key);
3536
3537 /* Some low-level request handling. This keeps access to
3538 * status_win restricted. */
3539 switch (request) {
3540 case REQ_PROMPT:
3541 {
3542 char *cmd = read_prompt(":");
3543
3544 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3545 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3546 opt_request = REQ_VIEW_DIFF;
3547 } else {
3548 opt_request = REQ_VIEW_PAGER;
3549 }
3550 break;
3551 }
3552
3553 request = REQ_NONE;
3554 break;
3555 }
3556 case REQ_SEARCH:
3557 case REQ_SEARCH_BACK:
3558 {
3559 const char *prompt = request == REQ_SEARCH
3560 ? "/" : "?";
3561 char *search = read_prompt(prompt);
3562
3563 if (search)
3564 string_copy(opt_search, search);
3565 else
3566 request = REQ_NONE;
3567 break;
3568 }
3569 case REQ_SCREEN_RESIZE:
3570 {
3571 int height, width;
3572
3573 getmaxyx(stdscr, height, width);
3574
3575 /* Resize the status view and let the view driver take
3576 * care of resizing the displayed views. */
3577 wresize(status_win, 1, width);
3578 mvwin(status_win, height - 1, 0);
3579 wrefresh(status_win);
3580 break;
3581 }
3582 default:
3583 break;
3584 }
3585 }
3586
3587 quit(0);
3588
3589 return 0;
3590 }
Full-screen terminal Git browser.