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Fix updating of the blob ref and the blob view ref
[tig] / tig.c
1 /* Copyright (c) 2006 Jonas Fonseca <fonseca@diku.dk>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #ifndef VERSION
15 #define VERSION "tig-0.4.git"
16 #endif
17
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
32
33 #include <sys/types.h>
34 #include <regex.h>
35
36 #include <locale.h>
37 #include <langinfo.h>
38 #include <iconv.h>
39
40 #include <curses.h>
41
42 #if __GNUC__ >= 3
43 #define __NORETURN __attribute__((__noreturn__))
44 #else
45 #define __NORETURN
46 #endif
47
48 static void __NORETURN die(const char *err, ...);
49 static void report(const char *msg, ...);
50 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
51 static void set_nonblocking_input(bool loading);
52 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
53
54 #define ABS(x) ((x) >= 0 ? (x) : -(x))
55 #define MIN(x, y) ((x) < (y) ? (x) : (y))
56
57 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
58 #define STRING_SIZE(x) (sizeof(x) - 1)
59
60 #define SIZEOF_STR 1024 /* Default string size. */
61 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
62 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
63
64 /* This color name can be used to refer to the default term colors. */
65 #define COLOR_DEFAULT (-1)
66
67 #define ICONV_NONE ((iconv_t) -1)
68
69 /* The format and size of the date column in the main view. */
70 #define DATE_FORMAT "%Y-%m-%d %H:%M"
71 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
72
73 #define AUTHOR_COLS 20
74
75 /* The default interval between line numbers. */
76 #define NUMBER_INTERVAL 1
77
78 #define TABSIZE 8
79
80 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
81
82 #define TIG_LS_REMOTE \
83 "git ls-remote . 2>/dev/null"
84
85 #define TIG_DIFF_CMD \
86 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
87
88 #define TIG_LOG_CMD \
89 "git log --cc --stat -n100 %s 2>/dev/null"
90
91 #define TIG_MAIN_CMD \
92 "git log --topo-order --pretty=raw %s 2>/dev/null"
93
94 #define TIG_TREE_CMD \
95 "git ls-tree %s %s"
96
97 #define TIG_BLOB_CMD \
98 "git cat-file blob %s"
99
100 /* XXX: Needs to be defined to the empty string. */
101 #define TIG_HELP_CMD ""
102 #define TIG_PAGER_CMD ""
103
104 /* Some ascii-shorthands fitted into the ncurses namespace. */
105 #define KEY_TAB '\t'
106 #define KEY_RETURN '\r'
107 #define KEY_ESC 27
108
109
110 struct ref {
111 char *name; /* Ref name; tag or head names are shortened. */
112 char id[41]; /* Commit SHA1 ID */
113 unsigned int tag:1; /* Is it a tag? */
114 unsigned int next:1; /* For ref lists: are there more refs? */
115 };
116
117 static struct ref **get_refs(char *id);
118
119 struct int_map {
120 const char *name;
121 int namelen;
122 int value;
123 };
124
125 static int
126 set_from_int_map(struct int_map *map, size_t map_size,
127 int *value, const char *name, int namelen)
128 {
129
130 int i;
131
132 for (i = 0; i < map_size; i++)
133 if (namelen == map[i].namelen &&
134 !strncasecmp(name, map[i].name, namelen)) {
135 *value = map[i].value;
136 return OK;
137 }
138
139 return ERR;
140 }
141
142
143 /*
144 * String helpers
145 */
146
147 static inline void
148 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
149 {
150 if (srclen > dstlen - 1)
151 srclen = dstlen - 1;
152
153 strncpy(dst, src, srclen);
154 dst[srclen] = 0;
155 }
156
157 /* Shorthands for safely copying into a fixed buffer. */
158
159 #define string_copy(dst, src) \
160 string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
161
162 #define string_ncopy(dst, src, srclen) \
163 string_ncopy_do(dst, sizeof(dst), src, srclen)
164
165 static char *
166 chomp_string(char *name)
167 {
168 int namelen;
169
170 while (isspace(*name))
171 name++;
172
173 namelen = strlen(name) - 1;
174 while (namelen > 0 && isspace(name[namelen]))
175 name[namelen--] = 0;
176
177 return name;
178 }
179
180 static bool
181 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
182 {
183 va_list args;
184 size_t pos = bufpos ? *bufpos : 0;
185
186 va_start(args, fmt);
187 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
188 va_end(args);
189
190 if (bufpos)
191 *bufpos = pos;
192
193 return pos >= bufsize ? FALSE : TRUE;
194 }
195
196 #define string_format(buf, fmt, args...) \
197 string_nformat(buf, sizeof(buf), NULL, fmt, args)
198
199 #define string_format_from(buf, from, fmt, args...) \
200 string_nformat(buf, sizeof(buf), from, fmt, args)
201
202 static int
203 string_enum_compare(const char *str1, const char *str2, int len)
204 {
205 size_t i;
206
207 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
208
209 /* Diff-Header == DIFF_HEADER */
210 for (i = 0; i < len; i++) {
211 if (toupper(str1[i]) == toupper(str2[i]))
212 continue;
213
214 if (string_enum_sep(str1[i]) &&
215 string_enum_sep(str2[i]))
216 continue;
217
218 return str1[i] - str2[i];
219 }
220
221 return 0;
222 }
223
224 /* Shell quoting
225 *
226 * NOTE: The following is a slightly modified copy of the git project's shell
227 * quoting routines found in the quote.c file.
228 *
229 * Help to copy the thing properly quoted for the shell safety. any single
230 * quote is replaced with '\'', any exclamation point is replaced with '\!',
231 * and the whole thing is enclosed in a
232 *
233 * E.g.
234 * original sq_quote result
235 * name ==> name ==> 'name'
236 * a b ==> a b ==> 'a b'
237 * a'b ==> a'\''b ==> 'a'\''b'
238 * a!b ==> a'\!'b ==> 'a'\!'b'
239 */
240
241 static size_t
242 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
243 {
244 char c;
245
246 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
247
248 BUFPUT('\'');
249 while ((c = *src++)) {
250 if (c == '\'' || c == '!') {
251 BUFPUT('\'');
252 BUFPUT('\\');
253 BUFPUT(c);
254 BUFPUT('\'');
255 } else {
256 BUFPUT(c);
257 }
258 }
259 BUFPUT('\'');
260
261 return bufsize;
262 }
263
264
265 /*
266 * User requests
267 */
268
269 #define REQ_INFO \
270 /* XXX: Keep the view request first and in sync with views[]. */ \
271 REQ_GROUP("View switching") \
272 REQ_(VIEW_MAIN, "Show main view"), \
273 REQ_(VIEW_DIFF, "Show diff view"), \
274 REQ_(VIEW_LOG, "Show log view"), \
275 REQ_(VIEW_TREE, "Show tree view"), \
276 REQ_(VIEW_BLOB, "Show blob view"), \
277 REQ_(VIEW_HELP, "Show help page"), \
278 REQ_(VIEW_PAGER, "Show pager view"), \
279 \
280 REQ_GROUP("View manipulation") \
281 REQ_(ENTER, "Enter current line and scroll"), \
282 REQ_(NEXT, "Move to next"), \
283 REQ_(PREVIOUS, "Move to previous"), \
284 REQ_(VIEW_NEXT, "Move focus to next view"), \
285 REQ_(VIEW_CLOSE, "Close the current view"), \
286 REQ_(QUIT, "Close all views and quit"), \
287 \
288 REQ_GROUP("Cursor navigation") \
289 REQ_(MOVE_UP, "Move cursor one line up"), \
290 REQ_(MOVE_DOWN, "Move cursor one line down"), \
291 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
292 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
293 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
294 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
295 \
296 REQ_GROUP("Scrolling") \
297 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
298 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
299 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
300 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
301 \
302 REQ_GROUP("Searching") \
303 REQ_(SEARCH, "Search the view"), \
304 REQ_(SEARCH_BACK, "Search backwards in the view"), \
305 REQ_(FIND_NEXT, "Find next search match"), \
306 REQ_(FIND_PREV, "Find previous search match"), \
307 \
308 REQ_GROUP("Misc") \
309 REQ_(NONE, "Do nothing"), \
310 REQ_(PROMPT, "Bring up the prompt"), \
311 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
312 REQ_(SCREEN_RESIZE, "Resize the screen"), \
313 REQ_(SHOW_VERSION, "Show version information"), \
314 REQ_(STOP_LOADING, "Stop all loading views"), \
315 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
316 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
317
318
319 /* User action requests. */
320 enum request {
321 #define REQ_GROUP(help)
322 #define REQ_(req, help) REQ_##req
323
324 /* Offset all requests to avoid conflicts with ncurses getch values. */
325 REQ_OFFSET = KEY_MAX + 1,
326 REQ_INFO,
327 REQ_UNKNOWN,
328
329 #undef REQ_GROUP
330 #undef REQ_
331 };
332
333 struct request_info {
334 enum request request;
335 char *name;
336 int namelen;
337 char *help;
338 };
339
340 static struct request_info req_info[] = {
341 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
342 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
343 REQ_INFO
344 #undef REQ_GROUP
345 #undef REQ_
346 };
347
348 static enum request
349 get_request(const char *name)
350 {
351 int namelen = strlen(name);
352 int i;
353
354 for (i = 0; i < ARRAY_SIZE(req_info); i++)
355 if (req_info[i].namelen == namelen &&
356 !string_enum_compare(req_info[i].name, name, namelen))
357 return req_info[i].request;
358
359 return REQ_UNKNOWN;
360 }
361
362
363 /*
364 * Options
365 */
366
367 static const char usage[] =
368 VERSION " (" __DATE__ ")\n"
369 "\n"
370 "Usage: tig [options]\n"
371 " or: tig [options] [--] [git log options]\n"
372 " or: tig [options] log [git log options]\n"
373 " or: tig [options] diff [git diff options]\n"
374 " or: tig [options] show [git show options]\n"
375 " or: tig [options] < [git command output]\n"
376 "\n"
377 "Options:\n"
378 " -l Start up in log view\n"
379 " -d Start up in diff view\n"
380 " -n[I], --line-number[=I] Show line numbers with given interval\n"
381 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
382 " -- Mark end of tig options\n"
383 " -v, --version Show version and exit\n"
384 " -h, --help Show help message and exit\n";
385
386 /* Option and state variables. */
387 static bool opt_line_number = FALSE;
388 static bool opt_rev_graph = TRUE;
389 static int opt_num_interval = NUMBER_INTERVAL;
390 static int opt_tab_size = TABSIZE;
391 static enum request opt_request = REQ_VIEW_MAIN;
392 static char opt_cmd[SIZEOF_STR] = "";
393 static char opt_path[SIZEOF_STR] = "";
394 static FILE *opt_pipe = NULL;
395 static char opt_encoding[20] = "UTF-8";
396 static bool opt_utf8 = TRUE;
397 static char opt_codeset[20] = "UTF-8";
398 static iconv_t opt_iconv = ICONV_NONE;
399 static char opt_search[SIZEOF_STR] = "";
400
401 enum option_type {
402 OPT_NONE,
403 OPT_INT,
404 };
405
406 static bool
407 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
408 {
409 va_list args;
410 char *value = "";
411 int *number;
412
413 if (opt[0] != '-')
414 return FALSE;
415
416 if (opt[1] == '-') {
417 int namelen = strlen(name);
418
419 opt += 2;
420
421 if (strncmp(opt, name, namelen))
422 return FALSE;
423
424 if (opt[namelen] == '=')
425 value = opt + namelen + 1;
426
427 } else {
428 if (!short_name || opt[1] != short_name)
429 return FALSE;
430 value = opt + 2;
431 }
432
433 va_start(args, type);
434 if (type == OPT_INT) {
435 number = va_arg(args, int *);
436 if (isdigit(*value))
437 *number = atoi(value);
438 }
439 va_end(args);
440
441 return TRUE;
442 }
443
444 /* Returns the index of log or diff command or -1 to exit. */
445 static bool
446 parse_options(int argc, char *argv[])
447 {
448 int i;
449
450 for (i = 1; i < argc; i++) {
451 char *opt = argv[i];
452
453 if (!strcmp(opt, "-l")) {
454 opt_request = REQ_VIEW_LOG;
455 continue;
456 }
457
458 if (!strcmp(opt, "-d")) {
459 opt_request = REQ_VIEW_DIFF;
460 continue;
461 }
462
463 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
464 opt_line_number = TRUE;
465 continue;
466 }
467
468 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
469 opt_tab_size = MIN(opt_tab_size, TABSIZE);
470 continue;
471 }
472
473 if (check_option(opt, 'v', "version", OPT_NONE)) {
474 printf("tig version %s\n", VERSION);
475 return FALSE;
476 }
477
478 if (check_option(opt, 'h', "help", OPT_NONE)) {
479 printf(usage);
480 return FALSE;
481 }
482
483 if (!strcmp(opt, "--")) {
484 i++;
485 break;
486 }
487
488 if (!strcmp(opt, "log") ||
489 !strcmp(opt, "diff") ||
490 !strcmp(opt, "show")) {
491 opt_request = opt[0] == 'l'
492 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
493 break;
494 }
495
496 if (opt[0] && opt[0] != '-')
497 break;
498
499 die("unknown option '%s'\n\n%s", opt, usage);
500 }
501
502 if (!isatty(STDIN_FILENO)) {
503 opt_request = REQ_VIEW_PAGER;
504 opt_pipe = stdin;
505
506 } else if (i < argc) {
507 size_t buf_size;
508
509 if (opt_request == REQ_VIEW_MAIN)
510 /* XXX: This is vulnerable to the user overriding
511 * options required for the main view parser. */
512 string_copy(opt_cmd, "git log --stat --pretty=raw");
513 else
514 string_copy(opt_cmd, "git");
515 buf_size = strlen(opt_cmd);
516
517 while (buf_size < sizeof(opt_cmd) && i < argc) {
518 opt_cmd[buf_size++] = ' ';
519 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
520 }
521
522 if (buf_size >= sizeof(opt_cmd))
523 die("command too long");
524
525 opt_cmd[buf_size] = 0;
526
527 }
528
529 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
530 opt_utf8 = FALSE;
531
532 return TRUE;
533 }
534
535
536 /*
537 * Line-oriented content detection.
538 */
539
540 #define LINE_INFO \
541 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
542 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
543 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
544 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
545 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
546 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
547 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
548 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
549 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
550 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
551 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
552 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
553 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
554 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
555 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
556 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
557 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
558 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
559 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
560 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
561 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
562 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
563 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
564 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
565 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
566 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
567 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
568 LINE(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 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
733 { ERR, REQ_NONE },
734
735 /* Using the ncurses SIGWINCH handler. */
736 { KEY_RESIZE, REQ_SCREEN_RESIZE },
737 };
738
739 #define KEYMAP_INFO \
740 KEYMAP_(GENERIC), \
741 KEYMAP_(MAIN), \
742 KEYMAP_(DIFF), \
743 KEYMAP_(LOG), \
744 KEYMAP_(TREE), \
745 KEYMAP_(BLOB), \
746 KEYMAP_(PAGER), \
747 KEYMAP_(HELP) \
748
749 enum keymap {
750 #define KEYMAP_(name) KEYMAP_##name
751 KEYMAP_INFO
752 #undef KEYMAP_
753 };
754
755 static struct int_map keymap_table[] = {
756 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
757 KEYMAP_INFO
758 #undef KEYMAP_
759 };
760
761 #define set_keymap(map, name) \
762 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
763
764 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
765
766 static void
767 add_keybinding(enum keymap keymap, enum request request, int key)
768 {
769 struct keybinding *keybinding;
770
771 keybinding = calloc(1, sizeof(*keybinding));
772 if (!keybinding)
773 die("Failed to allocate keybinding");
774
775 keybinding->alias = key;
776 keybinding->request = request;
777 keybinding->next = keybindings[keymap];
778 keybindings[keymap] = keybinding;
779 }
780
781 /* Looks for a key binding first in the given map, then in the generic map, and
782 * lastly in the default keybindings. */
783 static enum request
784 get_keybinding(enum keymap keymap, int key)
785 {
786 struct keybinding *kbd;
787 int i;
788
789 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
790 if (kbd->alias == key)
791 return kbd->request;
792
793 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
794 if (kbd->alias == key)
795 return kbd->request;
796
797 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
798 if (default_keybindings[i].alias == key)
799 return default_keybindings[i].request;
800
801 return (enum request) key;
802 }
803
804
805 struct key {
806 char *name;
807 int value;
808 };
809
810 static struct key key_table[] = {
811 { "Enter", KEY_RETURN },
812 { "Space", ' ' },
813 { "Backspace", KEY_BACKSPACE },
814 { "Tab", KEY_TAB },
815 { "Escape", KEY_ESC },
816 { "Left", KEY_LEFT },
817 { "Right", KEY_RIGHT },
818 { "Up", KEY_UP },
819 { "Down", KEY_DOWN },
820 { "Insert", KEY_IC },
821 { "Delete", KEY_DC },
822 { "Hash", '#' },
823 { "Home", KEY_HOME },
824 { "End", KEY_END },
825 { "PageUp", KEY_PPAGE },
826 { "PageDown", KEY_NPAGE },
827 { "F1", KEY_F(1) },
828 { "F2", KEY_F(2) },
829 { "F3", KEY_F(3) },
830 { "F4", KEY_F(4) },
831 { "F5", KEY_F(5) },
832 { "F6", KEY_F(6) },
833 { "F7", KEY_F(7) },
834 { "F8", KEY_F(8) },
835 { "F9", KEY_F(9) },
836 { "F10", KEY_F(10) },
837 { "F11", KEY_F(11) },
838 { "F12", KEY_F(12) },
839 };
840
841 static int
842 get_key_value(const char *name)
843 {
844 int i;
845
846 for (i = 0; i < ARRAY_SIZE(key_table); i++)
847 if (!strcasecmp(key_table[i].name, name))
848 return key_table[i].value;
849
850 if (strlen(name) == 1 && isprint(*name))
851 return (int) *name;
852
853 return ERR;
854 }
855
856 static char *
857 get_key(enum request request)
858 {
859 static char buf[BUFSIZ];
860 static char key_char[] = "'X'";
861 size_t pos = 0;
862 char *sep = " ";
863 int i;
864
865 buf[pos] = 0;
866
867 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
868 struct keybinding *keybinding = &default_keybindings[i];
869 char *seq = NULL;
870 int key;
871
872 if (keybinding->request != request)
873 continue;
874
875 for (key = 0; key < ARRAY_SIZE(key_table); key++)
876 if (key_table[key].value == keybinding->alias)
877 seq = key_table[key].name;
878
879 if (seq == NULL &&
880 keybinding->alias < 127 &&
881 isprint(keybinding->alias)) {
882 key_char[1] = (char) keybinding->alias;
883 seq = key_char;
884 }
885
886 if (!seq)
887 seq = "'?'";
888
889 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
890 return "Too many keybindings!";
891 sep = ", ";
892 }
893
894 return buf;
895 }
896
897
898 /*
899 * User config file handling.
900 */
901
902 static struct int_map color_map[] = {
903 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
904 COLOR_MAP(DEFAULT),
905 COLOR_MAP(BLACK),
906 COLOR_MAP(BLUE),
907 COLOR_MAP(CYAN),
908 COLOR_MAP(GREEN),
909 COLOR_MAP(MAGENTA),
910 COLOR_MAP(RED),
911 COLOR_MAP(WHITE),
912 COLOR_MAP(YELLOW),
913 };
914
915 #define set_color(color, name) \
916 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
917
918 static struct int_map attr_map[] = {
919 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
920 ATTR_MAP(NORMAL),
921 ATTR_MAP(BLINK),
922 ATTR_MAP(BOLD),
923 ATTR_MAP(DIM),
924 ATTR_MAP(REVERSE),
925 ATTR_MAP(STANDOUT),
926 ATTR_MAP(UNDERLINE),
927 };
928
929 #define set_attribute(attr, name) \
930 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
931
932 static int config_lineno;
933 static bool config_errors;
934 static char *config_msg;
935
936 /* Wants: object fgcolor bgcolor [attr] */
937 static int
938 option_color_command(int argc, char *argv[])
939 {
940 struct line_info *info;
941
942 if (argc != 3 && argc != 4) {
943 config_msg = "Wrong number of arguments given to color command";
944 return ERR;
945 }
946
947 info = get_line_info(argv[0], strlen(argv[0]));
948 if (!info) {
949 config_msg = "Unknown color name";
950 return ERR;
951 }
952
953 if (set_color(&info->fg, argv[1]) == ERR ||
954 set_color(&info->bg, argv[2]) == ERR) {
955 config_msg = "Unknown color";
956 return ERR;
957 }
958
959 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
960 config_msg = "Unknown attribute";
961 return ERR;
962 }
963
964 return OK;
965 }
966
967 /* Wants: name = value */
968 static int
969 option_set_command(int argc, char *argv[])
970 {
971 if (argc != 3) {
972 config_msg = "Wrong number of arguments given to set command";
973 return ERR;
974 }
975
976 if (strcmp(argv[1], "=")) {
977 config_msg = "No value assigned";
978 return ERR;
979 }
980
981 if (!strcmp(argv[0], "show-rev-graph")) {
982 opt_rev_graph = (!strcmp(argv[2], "1") ||
983 !strcmp(argv[2], "true") ||
984 !strcmp(argv[2], "yes"));
985 return OK;
986 }
987
988 if (!strcmp(argv[0], "line-number-interval")) {
989 opt_num_interval = atoi(argv[2]);
990 return OK;
991 }
992
993 if (!strcmp(argv[0], "tab-size")) {
994 opt_tab_size = atoi(argv[2]);
995 return OK;
996 }
997
998 if (!strcmp(argv[0], "commit-encoding")) {
999 char *arg = argv[2];
1000 int delimiter = *arg;
1001 int i;
1002
1003 switch (delimiter) {
1004 case '"':
1005 case '\'':
1006 for (arg++, i = 0; arg[i]; i++)
1007 if (arg[i] == delimiter) {
1008 arg[i] = 0;
1009 break;
1010 }
1011 default:
1012 string_copy(opt_encoding, arg);
1013 return OK;
1014 }
1015 }
1016
1017 config_msg = "Unknown variable name";
1018 return ERR;
1019 }
1020
1021 /* Wants: mode request key */
1022 static int
1023 option_bind_command(int argc, char *argv[])
1024 {
1025 enum request request;
1026 int keymap;
1027 int key;
1028
1029 if (argc != 3) {
1030 config_msg = "Wrong number of arguments given to bind command";
1031 return ERR;
1032 }
1033
1034 if (set_keymap(&keymap, argv[0]) == ERR) {
1035 config_msg = "Unknown key map";
1036 return ERR;
1037 }
1038
1039 key = get_key_value(argv[1]);
1040 if (key == ERR) {
1041 config_msg = "Unknown key";
1042 return ERR;
1043 }
1044
1045 request = get_request(argv[2]);
1046 if (request == REQ_UNKNOWN) {
1047 config_msg = "Unknown request name";
1048 return ERR;
1049 }
1050
1051 add_keybinding(keymap, request, key);
1052
1053 return OK;
1054 }
1055
1056 static int
1057 set_option(char *opt, char *value)
1058 {
1059 char *argv[16];
1060 int valuelen;
1061 int argc = 0;
1062
1063 /* Tokenize */
1064 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1065 argv[argc++] = value;
1066
1067 value += valuelen;
1068 if (!*value)
1069 break;
1070
1071 *value++ = 0;
1072 while (isspace(*value))
1073 value++;
1074 }
1075
1076 if (!strcmp(opt, "color"))
1077 return option_color_command(argc, argv);
1078
1079 if (!strcmp(opt, "set"))
1080 return option_set_command(argc, argv);
1081
1082 if (!strcmp(opt, "bind"))
1083 return option_bind_command(argc, argv);
1084
1085 config_msg = "Unknown option command";
1086 return ERR;
1087 }
1088
1089 static int
1090 read_option(char *opt, int optlen, char *value, int valuelen)
1091 {
1092 int status = OK;
1093
1094 config_lineno++;
1095 config_msg = "Internal error";
1096
1097 /* Check for comment markers, since read_properties() will
1098 * only ensure opt and value are split at first " \t". */
1099 optlen = strcspn(opt, "#");
1100 if (optlen == 0)
1101 return OK;
1102
1103 if (opt[optlen] != 0) {
1104 config_msg = "No option value";
1105 status = ERR;
1106
1107 } else {
1108 /* Look for comment endings in the value. */
1109 int len = strcspn(value, "#");
1110
1111 if (len < valuelen) {
1112 valuelen = len;
1113 value[valuelen] = 0;
1114 }
1115
1116 status = set_option(opt, value);
1117 }
1118
1119 if (status == ERR) {
1120 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1121 config_lineno, optlen, opt, config_msg);
1122 config_errors = TRUE;
1123 }
1124
1125 /* Always keep going if errors are encountered. */
1126 return OK;
1127 }
1128
1129 static int
1130 load_options(void)
1131 {
1132 char *home = getenv("HOME");
1133 char buf[SIZEOF_STR];
1134 FILE *file;
1135
1136 config_lineno = 0;
1137 config_errors = FALSE;
1138
1139 if (!home || !string_format(buf, "%s/.tigrc", home))
1140 return ERR;
1141
1142 /* It's ok that the file doesn't exist. */
1143 file = fopen(buf, "r");
1144 if (!file)
1145 return OK;
1146
1147 if (read_properties(file, " \t", read_option) == ERR ||
1148 config_errors == TRUE)
1149 fprintf(stderr, "Errors while loading %s.\n", buf);
1150
1151 return OK;
1152 }
1153
1154
1155 /*
1156 * The viewer
1157 */
1158
1159 struct view;
1160 struct view_ops;
1161
1162 /* The display array of active views and the index of the current view. */
1163 static struct view *display[2];
1164 static unsigned int current_view;
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
1268 assert(view_is_displayed(view));
1269
1270 if (view->offset + lineno >= view->lines)
1271 return FALSE;
1272
1273 line = &view->line[view->offset + lineno];
1274
1275 if (selected) {
1276 line->selected = TRUE;
1277 view->ops->select(view, line);
1278 } else if (line->selected) {
1279 line->selected = FALSE;
1280 wmove(view->win, lineno, 0);
1281 wclrtoeol(view->win);
1282 }
1283
1284 return view->ops->draw(view, line, lineno, selected);
1285 }
1286
1287 static void
1288 redraw_view_from(struct view *view, int lineno)
1289 {
1290 assert(0 <= lineno && lineno < view->height);
1291
1292 for (; lineno < view->height; lineno++) {
1293 if (!draw_view_line(view, lineno))
1294 break;
1295 }
1296
1297 redrawwin(view->win);
1298 wrefresh(view->win);
1299 }
1300
1301 static void
1302 redraw_view(struct view *view)
1303 {
1304 wclear(view->win);
1305 redraw_view_from(view, 0);
1306 }
1307
1308
1309 static void
1310 update_view_title(struct view *view)
1311 {
1312 assert(view_is_displayed(view));
1313
1314 if (view == display[current_view])
1315 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1316 else
1317 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1318
1319 werase(view->title);
1320 wmove(view->title, 0, 0);
1321
1322 if (*view->ref)
1323 wprintw(view->title, "[%s] %s", view->name, view->ref);
1324 else
1325 wprintw(view->title, "[%s]", view->name);
1326
1327 if (view->lines || view->pipe) {
1328 unsigned int view_lines = view->offset + view->height;
1329 unsigned int lines = view->lines
1330 ? MIN(view_lines, view->lines) * 100 / view->lines
1331 : 0;
1332
1333 wprintw(view->title, " - %s %d of %d (%d%%)",
1334 view->ops->type,
1335 view->lineno + 1,
1336 view->lines,
1337 lines);
1338 }
1339
1340 if (view->pipe) {
1341 time_t secs = time(NULL) - view->start_time;
1342
1343 /* Three git seconds are a long time ... */
1344 if (secs > 2)
1345 wprintw(view->title, " %lds", secs);
1346 }
1347
1348 wmove(view->title, 0, view->width - 1);
1349 wrefresh(view->title);
1350 }
1351
1352 static void
1353 resize_display(void)
1354 {
1355 int offset, i;
1356 struct view *base = display[0];
1357 struct view *view = display[1] ? display[1] : display[0];
1358
1359 /* Setup window dimensions */
1360
1361 getmaxyx(stdscr, base->height, base->width);
1362
1363 /* Make room for the status window. */
1364 base->height -= 1;
1365
1366 if (view != base) {
1367 /* Horizontal split. */
1368 view->width = base->width;
1369 view->height = SCALE_SPLIT_VIEW(base->height);
1370 base->height -= view->height;
1371
1372 /* Make room for the title bar. */
1373 view->height -= 1;
1374 }
1375
1376 /* Make room for the title bar. */
1377 base->height -= 1;
1378
1379 offset = 0;
1380
1381 foreach_displayed_view (view, i) {
1382 if (!view->win) {
1383 view->win = newwin(view->height, 0, offset, 0);
1384 if (!view->win)
1385 die("Failed to create %s view", view->name);
1386
1387 scrollok(view->win, TRUE);
1388
1389 view->title = newwin(1, 0, offset + view->height, 0);
1390 if (!view->title)
1391 die("Failed to create title window");
1392
1393 } else {
1394 wresize(view->win, view->height, view->width);
1395 mvwin(view->win, offset, 0);
1396 mvwin(view->title, offset + view->height, 0);
1397 }
1398
1399 offset += view->height + 1;
1400 }
1401 }
1402
1403 static void
1404 redraw_display(void)
1405 {
1406 struct view *view;
1407 int i;
1408
1409 foreach_displayed_view (view, i) {
1410 redraw_view(view);
1411 update_view_title(view);
1412 }
1413 }
1414
1415 static void
1416 update_display_cursor(void)
1417 {
1418 struct view *view = display[current_view];
1419
1420 /* Move the cursor to the right-most column of the cursor line.
1421 *
1422 * XXX: This could turn out to be a bit expensive, but it ensures that
1423 * the cursor does not jump around. */
1424 if (view->lines) {
1425 wmove(view->win, view->lineno - view->offset, view->width - 1);
1426 wrefresh(view->win);
1427 }
1428 }
1429
1430 /*
1431 * Navigation
1432 */
1433
1434 /* Scrolling backend */
1435 static void
1436 do_scroll_view(struct view *view, int lines)
1437 {
1438 bool redraw_current_line = FALSE;
1439
1440 /* The rendering expects the new offset. */
1441 view->offset += lines;
1442
1443 assert(0 <= view->offset && view->offset < view->lines);
1444 assert(lines);
1445
1446 /* Move current line into the view. */
1447 if (view->lineno < view->offset) {
1448 view->lineno = view->offset;
1449 redraw_current_line = TRUE;
1450 } else if (view->lineno >= view->offset + view->height) {
1451 view->lineno = view->offset + view->height - 1;
1452 redraw_current_line = TRUE;
1453 }
1454
1455 assert(view->offset <= view->lineno && view->lineno < view->lines);
1456
1457 /* Redraw the whole screen if scrolling is pointless. */
1458 if (view->height < ABS(lines)) {
1459 redraw_view(view);
1460
1461 } else {
1462 int line = lines > 0 ? view->height - lines : 0;
1463 int end = line + ABS(lines);
1464
1465 wscrl(view->win, lines);
1466
1467 for (; line < end; line++) {
1468 if (!draw_view_line(view, line))
1469 break;
1470 }
1471
1472 if (redraw_current_line)
1473 draw_view_line(view, view->lineno - view->offset);
1474 }
1475
1476 redrawwin(view->win);
1477 wrefresh(view->win);
1478 report("");
1479 }
1480
1481 /* Scroll frontend */
1482 static void
1483 scroll_view(struct view *view, enum request request)
1484 {
1485 int lines = 1;
1486
1487 assert(view_is_displayed(view));
1488
1489 switch (request) {
1490 case REQ_SCROLL_PAGE_DOWN:
1491 lines = view->height;
1492 case REQ_SCROLL_LINE_DOWN:
1493 if (view->offset + lines > view->lines)
1494 lines = view->lines - view->offset;
1495
1496 if (lines == 0 || view->offset + view->height >= view->lines) {
1497 report("Cannot scroll beyond the last line");
1498 return;
1499 }
1500 break;
1501
1502 case REQ_SCROLL_PAGE_UP:
1503 lines = view->height;
1504 case REQ_SCROLL_LINE_UP:
1505 if (lines > view->offset)
1506 lines = view->offset;
1507
1508 if (lines == 0) {
1509 report("Cannot scroll beyond the first line");
1510 return;
1511 }
1512
1513 lines = -lines;
1514 break;
1515
1516 default:
1517 die("request %d not handled in switch", request);
1518 }
1519
1520 do_scroll_view(view, lines);
1521 }
1522
1523 /* Cursor moving */
1524 static void
1525 move_view(struct view *view, enum request request)
1526 {
1527 int scroll_steps = 0;
1528 int steps;
1529
1530 switch (request) {
1531 case REQ_MOVE_FIRST_LINE:
1532 steps = -view->lineno;
1533 break;
1534
1535 case REQ_MOVE_LAST_LINE:
1536 steps = view->lines - view->lineno - 1;
1537 break;
1538
1539 case REQ_MOVE_PAGE_UP:
1540 steps = view->height > view->lineno
1541 ? -view->lineno : -view->height;
1542 break;
1543
1544 case REQ_MOVE_PAGE_DOWN:
1545 steps = view->lineno + view->height >= view->lines
1546 ? view->lines - view->lineno - 1 : view->height;
1547 break;
1548
1549 case REQ_MOVE_UP:
1550 steps = -1;
1551 break;
1552
1553 case REQ_MOVE_DOWN:
1554 steps = 1;
1555 break;
1556
1557 default:
1558 die("request %d not handled in switch", request);
1559 }
1560
1561 if (steps <= 0 && view->lineno == 0) {
1562 report("Cannot move beyond the first line");
1563 return;
1564
1565 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1566 report("Cannot move beyond the last line");
1567 return;
1568 }
1569
1570 /* Move the current line */
1571 view->lineno += steps;
1572 assert(0 <= view->lineno && view->lineno < view->lines);
1573
1574 /* Check whether the view needs to be scrolled */
1575 if (view->lineno < view->offset ||
1576 view->lineno >= view->offset + view->height) {
1577 scroll_steps = steps;
1578 if (steps < 0 && -steps > view->offset) {
1579 scroll_steps = -view->offset;
1580
1581 } else if (steps > 0) {
1582 if (view->lineno == view->lines - 1 &&
1583 view->lines > view->height) {
1584 scroll_steps = view->lines - view->offset - 1;
1585 if (scroll_steps >= view->height)
1586 scroll_steps -= view->height - 1;
1587 }
1588 }
1589 }
1590
1591 if (!view_is_displayed(view)) {
1592 view->offset += steps;
1593 view->ops->select(view, &view->line[view->lineno]);
1594 return;
1595 }
1596
1597 /* Repaint the old "current" line if we be scrolling */
1598 if (ABS(steps) < view->height)
1599 draw_view_line(view, view->lineno - steps - view->offset);
1600
1601 if (scroll_steps) {
1602 do_scroll_view(view, scroll_steps);
1603 return;
1604 }
1605
1606 /* Draw the current line */
1607 draw_view_line(view, view->lineno - view->offset);
1608
1609 redrawwin(view->win);
1610 wrefresh(view->win);
1611 report("");
1612 }
1613
1614
1615 /*
1616 * Searching
1617 */
1618
1619 static void search_view(struct view *view, enum request request);
1620
1621 static bool
1622 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1623 {
1624 assert(view_is_displayed(view));
1625
1626 if (!view->ops->grep(view, line))
1627 return FALSE;
1628
1629 if (lineno - view->offset >= view->height) {
1630 view->offset = lineno;
1631 view->lineno = lineno;
1632 redraw_view(view);
1633
1634 } else {
1635 unsigned long old_lineno = view->lineno - view->offset;
1636
1637 view->lineno = lineno;
1638 draw_view_line(view, old_lineno);
1639
1640 draw_view_line(view, view->lineno - view->offset);
1641 redrawwin(view->win);
1642 wrefresh(view->win);
1643 }
1644
1645 report("Line %ld matches '%s'", lineno + 1, view->grep);
1646 return TRUE;
1647 }
1648
1649 static void
1650 find_next(struct view *view, enum request request)
1651 {
1652 unsigned long lineno = view->lineno;
1653 int direction;
1654
1655 if (!*view->grep) {
1656 if (!*opt_search)
1657 report("No previous search");
1658 else
1659 search_view(view, request);
1660 return;
1661 }
1662
1663 switch (request) {
1664 case REQ_SEARCH:
1665 case REQ_FIND_NEXT:
1666 direction = 1;
1667 break;
1668
1669 case REQ_SEARCH_BACK:
1670 case REQ_FIND_PREV:
1671 direction = -1;
1672 break;
1673
1674 default:
1675 return;
1676 }
1677
1678 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1679 lineno += direction;
1680
1681 /* Note, lineno is unsigned long so will wrap around in which case it
1682 * will become bigger than view->lines. */
1683 for (; lineno < view->lines; lineno += direction) {
1684 struct line *line = &view->line[lineno];
1685
1686 if (find_next_line(view, lineno, line))
1687 return;
1688 }
1689
1690 report("No match found for '%s'", view->grep);
1691 }
1692
1693 static void
1694 search_view(struct view *view, enum request request)
1695 {
1696 int regex_err;
1697
1698 if (view->regex) {
1699 regfree(view->regex);
1700 *view->grep = 0;
1701 } else {
1702 view->regex = calloc(1, sizeof(*view->regex));
1703 if (!view->regex)
1704 return;
1705 }
1706
1707 regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
1708 if (regex_err != 0) {
1709 char buf[SIZEOF_STR] = "unknown error";
1710
1711 regerror(regex_err, view->regex, buf, sizeof(buf));
1712 report("Search failed: %s", buf);
1713 return;
1714 }
1715
1716 string_copy(view->grep, opt_search);
1717
1718 find_next(view, request);
1719 }
1720
1721 /*
1722 * Incremental updating
1723 */
1724
1725 static void
1726 end_update(struct view *view)
1727 {
1728 if (!view->pipe)
1729 return;
1730 set_nonblocking_input(FALSE);
1731 if (view->pipe == stdin)
1732 fclose(view->pipe);
1733 else
1734 pclose(view->pipe);
1735 view->pipe = NULL;
1736 }
1737
1738 static bool
1739 begin_update(struct view *view)
1740 {
1741 const char *id = view->id;
1742
1743 if (view->pipe)
1744 end_update(view);
1745
1746 if (opt_cmd[0]) {
1747 string_copy(view->cmd, opt_cmd);
1748 opt_cmd[0] = 0;
1749 /* When running random commands, the view ref could have become
1750 * invalid so clear it. */
1751 view->ref[0] = 0;
1752
1753 } else if (view == VIEW(REQ_VIEW_TREE)) {
1754 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1755
1756 if (strcmp(view->vid, view->id))
1757 opt_path[0] = 0;
1758
1759 if (!string_format(view->cmd, format, id, opt_path))
1760 return FALSE;
1761
1762 } else {
1763 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1764
1765 if (!string_format(view->cmd, format, id, id, id, id, id))
1766 return FALSE;
1767 }
1768
1769 /* Special case for the pager view. */
1770 if (opt_pipe) {
1771 view->pipe = opt_pipe;
1772 opt_pipe = NULL;
1773 } else {
1774 view->pipe = popen(view->cmd, "r");
1775 }
1776
1777 if (!view->pipe)
1778 return FALSE;
1779
1780 set_nonblocking_input(TRUE);
1781
1782 view->offset = 0;
1783 view->lines = 0;
1784 view->lineno = 0;
1785 string_copy(view->vid, id);
1786
1787 if (view->line) {
1788 int i;
1789
1790 for (i = 0; i < view->lines; i++)
1791 if (view->line[i].data)
1792 free(view->line[i].data);
1793
1794 free(view->line);
1795 view->line = NULL;
1796 }
1797
1798 view->start_time = time(NULL);
1799
1800 return TRUE;
1801 }
1802
1803 static struct line *
1804 realloc_lines(struct view *view, size_t line_size)
1805 {
1806 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1807
1808 if (!tmp)
1809 return NULL;
1810
1811 view->line = tmp;
1812 view->line_size = line_size;
1813 return view->line;
1814 }
1815
1816 static bool
1817 update_view(struct view *view)
1818 {
1819 char in_buffer[BUFSIZ];
1820 char out_buffer[BUFSIZ * 2];
1821 char *line;
1822 /* The number of lines to read. If too low it will cause too much
1823 * redrawing (and possible flickering), if too high responsiveness
1824 * will suffer. */
1825 unsigned long lines = view->height;
1826 int redraw_from = -1;
1827
1828 if (!view->pipe)
1829 return TRUE;
1830
1831 /* Only redraw if lines are visible. */
1832 if (view->offset + view->height >= view->lines)
1833 redraw_from = view->lines - view->offset;
1834
1835 /* FIXME: This is probably not perfect for backgrounded views. */
1836 if (!realloc_lines(view, view->lines + lines))
1837 goto alloc_error;
1838
1839 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1840 size_t linelen = strlen(line);
1841
1842 if (linelen)
1843 line[linelen - 1] = 0;
1844
1845 if (opt_iconv != ICONV_NONE) {
1846 char *inbuf = line;
1847 size_t inlen = linelen;
1848
1849 char *outbuf = out_buffer;
1850 size_t outlen = sizeof(out_buffer);
1851
1852 size_t ret;
1853
1854 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1855 if (ret != (size_t) -1) {
1856 line = out_buffer;
1857 linelen = strlen(out_buffer);
1858 }
1859 }
1860
1861 if (!view->ops->read(view, line))
1862 goto alloc_error;
1863
1864 if (lines-- == 1)
1865 break;
1866 }
1867
1868 {
1869 int digits;
1870
1871 lines = view->lines;
1872 for (digits = 0; lines; digits++)
1873 lines /= 10;
1874
1875 /* Keep the displayed view in sync with line number scaling. */
1876 if (digits != view->digits) {
1877 view->digits = digits;
1878 redraw_from = 0;
1879 }
1880 }
1881
1882 if (!view_is_displayed(view))
1883 goto check_pipe;
1884
1885 if (view == VIEW(REQ_VIEW_TREE)) {
1886 /* Clear the view and redraw everything since the tree sorting
1887 * might have rearranged things. */
1888 redraw_view(view);
1889
1890 } else if (redraw_from >= 0) {
1891 /* If this is an incremental update, redraw the previous line
1892 * since for commits some members could have changed when
1893 * loading the main view. */
1894 if (redraw_from > 0)
1895 redraw_from--;
1896
1897 /* Incrementally draw avoids flickering. */
1898 redraw_view_from(view, redraw_from);
1899 }
1900
1901 /* Update the title _after_ the redraw so that if the redraw picks up a
1902 * commit reference in view->ref it'll be available here. */
1903 update_view_title(view);
1904
1905 check_pipe:
1906 if (ferror(view->pipe)) {
1907 report("Failed to read: %s", strerror(errno));
1908 goto end;
1909
1910 } else if (feof(view->pipe)) {
1911 report("");
1912 goto end;
1913 }
1914
1915 return TRUE;
1916
1917 alloc_error:
1918 report("Allocation failure");
1919
1920 end:
1921 end_update(view);
1922 return FALSE;
1923 }
1924
1925
1926 /*
1927 * View opening
1928 */
1929
1930 static void open_help_view(struct view *view)
1931 {
1932 char buf[BUFSIZ];
1933 int lines = ARRAY_SIZE(req_info) + 2;
1934 int i;
1935
1936 if (view->lines > 0)
1937 return;
1938
1939 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1940 if (!req_info[i].request)
1941 lines++;
1942
1943 view->line = calloc(lines, sizeof(*view->line));
1944 if (!view->line) {
1945 report("Allocation failure");
1946 return;
1947 }
1948
1949 view->ops->read(view, "Quick reference for tig keybindings:");
1950
1951 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1952 char *key;
1953
1954 if (!req_info[i].request) {
1955 view->ops->read(view, "");
1956 view->ops->read(view, req_info[i].help);
1957 continue;
1958 }
1959
1960 key = get_key(req_info[i].request);
1961 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1962 continue;
1963
1964 view->ops->read(view, buf);
1965 }
1966 }
1967
1968 enum open_flags {
1969 OPEN_DEFAULT = 0, /* Use default view switching. */
1970 OPEN_SPLIT = 1, /* Split current view. */
1971 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1972 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1973 };
1974
1975 static void
1976 open_view(struct view *prev, enum request request, enum open_flags flags)
1977 {
1978 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1979 bool split = !!(flags & OPEN_SPLIT);
1980 bool reload = !!(flags & OPEN_RELOAD);
1981 struct view *view = VIEW(request);
1982 int nviews = displayed_views();
1983 struct view *base_view = display[0];
1984
1985 if (view == prev && nviews == 1 && !reload) {
1986 report("Already in %s view", view->name);
1987 return;
1988 }
1989
1990 if (view == VIEW(REQ_VIEW_HELP)) {
1991 open_help_view(view);
1992
1993 } else if ((reload || strcmp(view->vid, view->id)) &&
1994 !begin_update(view)) {
1995 report("Failed to load %s view", view->name);
1996 return;
1997 }
1998
1999 if (split) {
2000 display[1] = view;
2001 if (!backgrounded)
2002 current_view = 1;
2003 } else {
2004 /* Maximize the current view. */
2005 memset(display, 0, sizeof(display));
2006 current_view = 0;
2007 display[current_view] = view;
2008 }
2009
2010 /* Resize the view when switching between split- and full-screen,
2011 * or when switching between two different full-screen views. */
2012 if (nviews != displayed_views() ||
2013 (nviews == 1 && base_view != display[0]))
2014 resize_display();
2015
2016 if (split && prev->lineno - prev->offset >= prev->height) {
2017 /* Take the title line into account. */
2018 int lines = prev->lineno - prev->offset - prev->height + 1;
2019
2020 /* Scroll the view that was split if the current line is
2021 * outside the new limited view. */
2022 do_scroll_view(prev, lines);
2023 }
2024
2025 if (prev && view != prev) {
2026 if (split && !backgrounded) {
2027 /* "Blur" the previous view. */
2028 update_view_title(prev);
2029 }
2030
2031 view->parent = prev;
2032 }
2033
2034 if (view->pipe && view->lines == 0) {
2035 /* Clear the old view and let the incremental updating refill
2036 * the screen. */
2037 wclear(view->win);
2038 report("");
2039 } else {
2040 redraw_view(view);
2041 report("");
2042 }
2043
2044 /* If the view is backgrounded the above calls to report()
2045 * won't redraw the view title. */
2046 if (backgrounded)
2047 update_view_title(view);
2048 }
2049
2050
2051 /*
2052 * User request switch noodle
2053 */
2054
2055 static int
2056 view_driver(struct view *view, enum request request)
2057 {
2058 int i;
2059
2060 switch (request) {
2061 case REQ_MOVE_UP:
2062 case REQ_MOVE_DOWN:
2063 case REQ_MOVE_PAGE_UP:
2064 case REQ_MOVE_PAGE_DOWN:
2065 case REQ_MOVE_FIRST_LINE:
2066 case REQ_MOVE_LAST_LINE:
2067 move_view(view, request);
2068 break;
2069
2070 case REQ_SCROLL_LINE_DOWN:
2071 case REQ_SCROLL_LINE_UP:
2072 case REQ_SCROLL_PAGE_DOWN:
2073 case REQ_SCROLL_PAGE_UP:
2074 scroll_view(view, request);
2075 break;
2076
2077 case REQ_VIEW_BLOB:
2078 if (!ref_blob[0]) {
2079 report("No file chosen, press 't' to open tree view");
2080 break;
2081 }
2082 /* Fall-through */
2083 case REQ_VIEW_MAIN:
2084 case REQ_VIEW_DIFF:
2085 case REQ_VIEW_LOG:
2086 case REQ_VIEW_TREE:
2087 case REQ_VIEW_HELP:
2088 case REQ_VIEW_PAGER:
2089 open_view(view, request, OPEN_DEFAULT);
2090 break;
2091
2092 case REQ_NEXT:
2093 case REQ_PREVIOUS:
2094 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2095
2096 if ((view == VIEW(REQ_VIEW_DIFF) &&
2097 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2098 (view == VIEW(REQ_VIEW_BLOB) &&
2099 view->parent == VIEW(REQ_VIEW_TREE))) {
2100 view = view->parent;
2101 move_view(view, request);
2102 if (view_is_displayed(view))
2103 update_view_title(view);
2104 } else {
2105 move_view(view, request);
2106 break;
2107 }
2108 /* Fall-through */
2109
2110 case REQ_ENTER:
2111 if (!view->lines) {
2112 report("Nothing to enter");
2113 break;
2114 }
2115 return view->ops->enter(view, &view->line[view->lineno]);
2116
2117 case REQ_VIEW_NEXT:
2118 {
2119 int nviews = displayed_views();
2120 int next_view = (current_view + 1) % nviews;
2121
2122 if (next_view == current_view) {
2123 report("Only one view is displayed");
2124 break;
2125 }
2126
2127 current_view = next_view;
2128 /* Blur out the title of the previous view. */
2129 update_view_title(view);
2130 report("");
2131 break;
2132 }
2133 case REQ_TOGGLE_LINENO:
2134 opt_line_number = !opt_line_number;
2135 redraw_display();
2136 break;
2137
2138 case REQ_TOGGLE_REV_GRAPH:
2139 opt_rev_graph = !opt_rev_graph;
2140 redraw_display();
2141 break;
2142
2143 case REQ_PROMPT:
2144 /* Always reload^Wrerun commands from the prompt. */
2145 open_view(view, opt_request, OPEN_RELOAD);
2146 break;
2147
2148 case REQ_SEARCH:
2149 case REQ_SEARCH_BACK:
2150 search_view(view, request);
2151 break;
2152
2153 case REQ_FIND_NEXT:
2154 case REQ_FIND_PREV:
2155 find_next(view, request);
2156 break;
2157
2158 case REQ_STOP_LOADING:
2159 for (i = 0; i < ARRAY_SIZE(views); i++) {
2160 view = &views[i];
2161 if (view->pipe)
2162 report("Stopped loading the %s view", view->name),
2163 end_update(view);
2164 }
2165 break;
2166
2167 case REQ_SHOW_VERSION:
2168 report("%s (built %s)", VERSION, __DATE__);
2169 return TRUE;
2170
2171 case REQ_SCREEN_RESIZE:
2172 resize_display();
2173 /* Fall-through */
2174 case REQ_SCREEN_REDRAW:
2175 redraw_display();
2176 break;
2177
2178 case REQ_NONE:
2179 doupdate();
2180 return TRUE;
2181
2182 case REQ_VIEW_CLOSE:
2183 /* XXX: Mark closed views by letting view->parent point to the
2184 * view itself. Parents to closed view should never be
2185 * followed. */
2186 if (view->parent &&
2187 view->parent->parent != view->parent) {
2188 memset(display, 0, sizeof(display));
2189 current_view = 0;
2190 display[current_view] = view->parent;
2191 view->parent = view;
2192 resize_display();
2193 redraw_display();
2194 break;
2195 }
2196 /* Fall-through */
2197 case REQ_QUIT:
2198 return FALSE;
2199
2200 default:
2201 /* An unknown key will show most commonly used commands. */
2202 report("Unknown key, press 'h' for help");
2203 return TRUE;
2204 }
2205
2206 return TRUE;
2207 }
2208
2209
2210 /*
2211 * Pager backend
2212 */
2213
2214 static bool
2215 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2216 {
2217 char *text = line->data;
2218 enum line_type type = line->type;
2219 int textlen = strlen(text);
2220 int attr;
2221
2222 wmove(view->win, lineno, 0);
2223
2224 if (selected) {
2225 type = LINE_CURSOR;
2226 wchgat(view->win, -1, 0, type, NULL);
2227 }
2228
2229 attr = get_line_attr(type);
2230 wattrset(view->win, attr);
2231
2232 if (opt_line_number || opt_tab_size < TABSIZE) {
2233 static char spaces[] = " ";
2234 int col_offset = 0, col = 0;
2235
2236 if (opt_line_number) {
2237 unsigned long real_lineno = view->offset + lineno + 1;
2238
2239 if (real_lineno == 1 ||
2240 (real_lineno % opt_num_interval) == 0) {
2241 wprintw(view->win, "%.*d", view->digits, real_lineno);
2242
2243 } else {
2244 waddnstr(view->win, spaces,
2245 MIN(view->digits, STRING_SIZE(spaces)));
2246 }
2247 waddstr(view->win, ": ");
2248 col_offset = view->digits + 2;
2249 }
2250
2251 while (text && col_offset + col < view->width) {
2252 int cols_max = view->width - col_offset - col;
2253 char *pos = text;
2254 int cols;
2255
2256 if (*text == '\t') {
2257 text++;
2258 assert(sizeof(spaces) > TABSIZE);
2259 pos = spaces;
2260 cols = opt_tab_size - (col % opt_tab_size);
2261
2262 } else {
2263 text = strchr(text, '\t');
2264 cols = line ? text - pos : strlen(pos);
2265 }
2266
2267 waddnstr(view->win, pos, MIN(cols, cols_max));
2268 col += cols;
2269 }
2270
2271 } else {
2272 int col = 0, pos = 0;
2273
2274 for (; pos < textlen && col < view->width; pos++, col++)
2275 if (text[pos] == '\t')
2276 col += TABSIZE - (col % TABSIZE) - 1;
2277
2278 waddnstr(view->win, text, pos);
2279 }
2280
2281 return TRUE;
2282 }
2283
2284 static bool
2285 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2286 {
2287 char refbuf[SIZEOF_STR];
2288 char *ref = NULL;
2289 FILE *pipe;
2290
2291 if (!string_format(refbuf, "git describe %s", commit_id))
2292 return TRUE;
2293
2294 pipe = popen(refbuf, "r");
2295 if (!pipe)
2296 return TRUE;
2297
2298 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2299 ref = chomp_string(ref);
2300 pclose(pipe);
2301
2302 if (!ref || !*ref)
2303 return TRUE;
2304
2305 /* This is the only fatal call, since it can "corrupt" the buffer. */
2306 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2307 return FALSE;
2308
2309 return TRUE;
2310 }
2311
2312 static void
2313 add_pager_refs(struct view *view, struct line *line)
2314 {
2315 char buf[SIZEOF_STR];
2316 char *commit_id = line->data + STRING_SIZE("commit ");
2317 struct ref **refs;
2318 size_t bufpos = 0, refpos = 0;
2319 const char *sep = "Refs: ";
2320 bool is_tag = FALSE;
2321
2322 assert(line->type == LINE_COMMIT);
2323
2324 refs = get_refs(commit_id);
2325 if (!refs) {
2326 if (view == VIEW(REQ_VIEW_DIFF))
2327 goto try_add_describe_ref;
2328 return;
2329 }
2330
2331 do {
2332 struct ref *ref = refs[refpos];
2333 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2334
2335 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2336 return;
2337 sep = ", ";
2338 if (ref->tag)
2339 is_tag = TRUE;
2340 } while (refs[refpos++]->next);
2341
2342 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2343 try_add_describe_ref:
2344 /* Add <tag>-g<commit_id> "fake" reference. */
2345 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2346 return;
2347 }
2348
2349 if (bufpos == 0)
2350 return;
2351
2352 if (!realloc_lines(view, view->line_size + 1))
2353 return;
2354
2355 line = &view->line[view->lines];
2356 line->data = strdup(buf);
2357 if (!line->data)
2358 return;
2359
2360 line->type = LINE_PP_REFS;
2361 view->lines++;
2362 }
2363
2364 static bool
2365 pager_read(struct view *view, char *data)
2366 {
2367 struct line *line = &view->line[view->lines];
2368
2369 line->data = strdup(data);
2370 if (!line->data)
2371 return FALSE;
2372
2373 line->type = get_line_type(line->data);
2374 view->lines++;
2375
2376 if (line->type == LINE_COMMIT &&
2377 (view == VIEW(REQ_VIEW_DIFF) ||
2378 view == VIEW(REQ_VIEW_LOG)))
2379 add_pager_refs(view, line);
2380
2381 return TRUE;
2382 }
2383
2384 static bool
2385 pager_enter(struct view *view, struct line *line)
2386 {
2387 int split = 0;
2388
2389 if (line->type == LINE_COMMIT &&
2390 (view == VIEW(REQ_VIEW_LOG) ||
2391 view == VIEW(REQ_VIEW_PAGER))) {
2392 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2393 split = 1;
2394 }
2395
2396 /* Always scroll the view even if it was split. That way
2397 * you can use Enter to scroll through the log view and
2398 * split open each commit diff. */
2399 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2400
2401 /* FIXME: A minor workaround. Scrolling the view will call report("")
2402 * but if we are scrolling a non-current view this won't properly
2403 * update the view title. */
2404 if (split)
2405 update_view_title(view);
2406
2407 return TRUE;
2408 }
2409
2410 static bool
2411 pager_grep(struct view *view, struct line *line)
2412 {
2413 regmatch_t pmatch;
2414 char *text = line->data;
2415
2416 if (!*text)
2417 return FALSE;
2418
2419 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2420 return FALSE;
2421
2422 return TRUE;
2423 }
2424
2425 static void
2426 pager_select(struct view *view, struct line *line)
2427 {
2428 if (line->type == LINE_COMMIT) {
2429 char *text = line->data;
2430
2431 string_copy(view->ref, text + STRING_SIZE("commit "));
2432 string_copy(ref_commit, view->ref);
2433 }
2434 }
2435
2436 static struct view_ops pager_ops = {
2437 "line",
2438 pager_draw,
2439 pager_read,
2440 pager_enter,
2441 pager_grep,
2442 pager_select,
2443 };
2444
2445
2446 /*
2447 * Tree backend
2448 */
2449
2450 /* Parse output from git ls-tree:
2451 *
2452 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2453 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2454 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2455 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2456 */
2457
2458 #define SIZEOF_TREE_ATTR \
2459 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2460
2461 #define TREE_UP_FORMAT "040000 tree %s\t.."
2462
2463 static int
2464 tree_compare_entry(enum line_type type1, char *name1,
2465 enum line_type type2, char *name2)
2466 {
2467 if (type1 != type2) {
2468 if (type1 == LINE_TREE_DIR)
2469 return -1;
2470 return 1;
2471 }
2472
2473 return strcmp(name1, name2);
2474 }
2475
2476 static bool
2477 tree_read(struct view *view, char *text)
2478 {
2479 size_t textlen = strlen(text);
2480 char buf[SIZEOF_STR];
2481 unsigned long pos;
2482 enum line_type type;
2483 bool first_read = view->lines == 0;
2484
2485 if (textlen <= SIZEOF_TREE_ATTR)
2486 return FALSE;
2487
2488 type = text[STRING_SIZE("100644 ")] == 't'
2489 ? LINE_TREE_DIR : LINE_TREE_FILE;
2490
2491 if (first_read) {
2492 /* Add path info line */
2493 if (string_format(buf, "Directory path /%s", opt_path) &&
2494 realloc_lines(view, view->line_size + 1) &&
2495 pager_read(view, buf))
2496 view->line[view->lines - 1].type = LINE_DEFAULT;
2497 else
2498 return FALSE;
2499
2500 /* Insert "link" to parent directory. */
2501 if (*opt_path &&
2502 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2503 realloc_lines(view, view->line_size + 1) &&
2504 pager_read(view, buf))
2505 view->line[view->lines - 1].type = LINE_TREE_DIR;
2506 else if (*opt_path)
2507 return FALSE;
2508 }
2509
2510 /* Strip the path part ... */
2511 if (*opt_path) {
2512 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2513 size_t striplen = strlen(opt_path);
2514 char *path = text + SIZEOF_TREE_ATTR;
2515
2516 if (pathlen > striplen)
2517 memmove(path, path + striplen,
2518 pathlen - striplen + 1);
2519 }
2520
2521 /* Skip "Directory ..." and ".." line. */
2522 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2523 struct line *line = &view->line[pos];
2524 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2525 char *path2 = text + SIZEOF_TREE_ATTR;
2526 int cmp = tree_compare_entry(line->type, path1, type, path2);
2527
2528 if (cmp <= 0)
2529 continue;
2530
2531 text = strdup(text);
2532 if (!text)
2533 return FALSE;
2534
2535 if (view->lines > pos)
2536 memmove(&view->line[pos + 1], &view->line[pos],
2537 (view->lines - pos) * sizeof(*line));
2538
2539 line = &view->line[pos];
2540 line->data = text;
2541 line->type = type;
2542 view->lines++;
2543 return TRUE;
2544 }
2545
2546 if (!pager_read(view, text))
2547 return FALSE;
2548
2549 /* Move the current line to the first tree entry. */
2550 if (first_read)
2551 view->lineno++;
2552
2553 view->line[view->lines - 1].type = type;
2554 return TRUE;
2555 }
2556
2557 static bool
2558 tree_enter(struct view *view, struct line *line)
2559 {
2560 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2561 char *data = line->data;
2562 enum request request;
2563
2564 switch (line->type) {
2565 case LINE_TREE_DIR:
2566 /* Depending on whether it is a subdir or parent (updir?) link
2567 * mangle the path buffer. */
2568 if (line == &view->line[1] && *opt_path) {
2569 size_t path_len = strlen(opt_path);
2570 char *dirsep = opt_path + path_len - 1;
2571
2572 while (dirsep > opt_path && dirsep[-1] != '/')
2573 dirsep--;
2574
2575 dirsep[0] = 0;
2576
2577 } else {
2578 size_t pathlen = strlen(opt_path);
2579 size_t origlen = pathlen;
2580 char *basename = data + SIZEOF_TREE_ATTR;
2581
2582 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2583 opt_path[origlen] = 0;
2584 return TRUE;
2585 }
2586 }
2587
2588 /* Trees and subtrees share the same ID, so they are not not
2589 * unique like blobs. */
2590 flags |= OPEN_RELOAD;
2591 request = REQ_VIEW_TREE;
2592 break;
2593
2594 case LINE_TREE_FILE:
2595 request = REQ_VIEW_BLOB;
2596 break;
2597
2598 default:
2599 return TRUE;
2600 }
2601
2602 open_view(view, request, flags);
2603
2604 return TRUE;
2605 }
2606
2607 static void
2608 tree_select(struct view *view, struct line *line)
2609 {
2610 char *text = line->data;
2611
2612 text += STRING_SIZE("100644 blob ");
2613
2614 if (line->type == LINE_TREE_FILE) {
2615 string_ncopy(ref_blob, text, 40);
2616 /* Also update the blob view's ref, since all there must always
2617 * be in sync. */
2618 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2619
2620 } else if (line->type == LINE_TREE_DIR) {
2621 string_ncopy(view->ref, text, 40);
2622 }
2623 }
2624
2625 static struct view_ops tree_ops = {
2626 "file",
2627 pager_draw,
2628 tree_read,
2629 tree_enter,
2630 pager_grep,
2631 tree_select,
2632 };
2633
2634 static bool
2635 blob_read(struct view *view, char *line)
2636 {
2637 bool state = pager_read(view, line);
2638
2639 if (state == TRUE)
2640 view->line[view->lines - 1].type = LINE_DEFAULT;
2641
2642 return state;
2643 }
2644
2645 static struct view_ops blob_ops = {
2646 "line",
2647 pager_draw,
2648 blob_read,
2649 pager_enter,
2650 pager_grep,
2651 pager_select,
2652 };
2653
2654
2655 /*
2656 * Main view backend
2657 */
2658
2659 struct commit {
2660 char id[41]; /* SHA1 ID. */
2661 char title[75]; /* First line of the commit message. */
2662 char author[75]; /* Author of the commit. */
2663 struct tm time; /* Date from the author ident. */
2664 struct ref **refs; /* Repository references. */
2665 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2666 size_t graph_size; /* The width of the graph array. */
2667 };
2668
2669 static bool
2670 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2671 {
2672 char buf[DATE_COLS + 1];
2673 struct commit *commit = line->data;
2674 enum line_type type;
2675 int col = 0;
2676 size_t timelen;
2677 size_t authorlen;
2678 int trimmed = 1;
2679
2680 if (!*commit->author)
2681 return FALSE;
2682
2683 wmove(view->win, lineno, col);
2684
2685 if (selected) {
2686 type = LINE_CURSOR;
2687 wattrset(view->win, get_line_attr(type));
2688 wchgat(view->win, -1, 0, type, NULL);
2689
2690 } else {
2691 type = LINE_MAIN_COMMIT;
2692 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2693 }
2694
2695 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2696 waddnstr(view->win, buf, timelen);
2697 waddstr(view->win, " ");
2698
2699 col += DATE_COLS;
2700 wmove(view->win, lineno, col);
2701 if (type != LINE_CURSOR)
2702 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2703
2704 if (opt_utf8) {
2705 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2706 } else {
2707 authorlen = strlen(commit->author);
2708 if (authorlen > AUTHOR_COLS - 2) {
2709 authorlen = AUTHOR_COLS - 2;
2710 trimmed = 1;
2711 }
2712 }
2713
2714 if (trimmed) {
2715 waddnstr(view->win, commit->author, authorlen);
2716 if (type != LINE_CURSOR)
2717 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2718 waddch(view->win, '~');
2719 } else {
2720 waddstr(view->win, commit->author);
2721 }
2722
2723 col += AUTHOR_COLS;
2724 if (type != LINE_CURSOR)
2725 wattrset(view->win, A_NORMAL);
2726
2727 if (opt_rev_graph && commit->graph_size) {
2728 size_t i;
2729
2730 wmove(view->win, lineno, col);
2731 /* Using waddch() instead of waddnstr() ensures that
2732 * they'll be rendered correctly for the cursor line. */
2733 for (i = 0; i < commit->graph_size; i++)
2734 waddch(view->win, commit->graph[i]);
2735
2736 col += commit->graph_size + 1;
2737 }
2738
2739 wmove(view->win, lineno, col);
2740
2741 if (commit->refs) {
2742 size_t i = 0;
2743
2744 do {
2745 if (type == LINE_CURSOR)
2746 ;
2747 else if (commit->refs[i]->tag)
2748 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2749 else
2750 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2751 waddstr(view->win, "[");
2752 waddstr(view->win, commit->refs[i]->name);
2753 waddstr(view->win, "]");
2754 if (type != LINE_CURSOR)
2755 wattrset(view->win, A_NORMAL);
2756 waddstr(view->win, " ");
2757 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2758 } while (commit->refs[i++]->next);
2759 }
2760
2761 if (type != LINE_CURSOR)
2762 wattrset(view->win, get_line_attr(type));
2763
2764 {
2765 int titlelen = strlen(commit->title);
2766
2767 if (col + titlelen > view->width)
2768 titlelen = view->width - col;
2769
2770 waddnstr(view->win, commit->title, titlelen);
2771 }
2772
2773 return TRUE;
2774 }
2775
2776 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2777 static bool
2778 main_read(struct view *view, char *line)
2779 {
2780 enum line_type type = get_line_type(line);
2781 struct commit *commit = view->lines
2782 ? view->line[view->lines - 1].data : NULL;
2783
2784 switch (type) {
2785 case LINE_COMMIT:
2786 commit = calloc(1, sizeof(struct commit));
2787 if (!commit)
2788 return FALSE;
2789
2790 line += STRING_SIZE("commit ");
2791
2792 view->line[view->lines++].data = commit;
2793 string_copy(commit->id, line);
2794 commit->refs = get_refs(commit->id);
2795 commit->graph[commit->graph_size++] = ACS_LTEE;
2796 break;
2797
2798 case LINE_AUTHOR:
2799 {
2800 char *ident = line + STRING_SIZE("author ");
2801 char *end = strchr(ident, '<');
2802
2803 if (!commit)
2804 break;
2805
2806 if (end) {
2807 char *email = end + 1;
2808
2809 for (; end > ident && isspace(end[-1]); end--) ;
2810
2811 if (end == ident && *email) {
2812 ident = email;
2813 end = strchr(ident, '>');
2814 for (; end > ident && isspace(end[-1]); end--) ;
2815 }
2816 *end = 0;
2817 }
2818
2819 /* End is NULL or ident meaning there's no author. */
2820 if (end <= ident)
2821 ident = "Unknown";
2822
2823 string_copy(commit->author, ident);
2824
2825 /* Parse epoch and timezone */
2826 if (end) {
2827 char *secs = strchr(end + 1, '>');
2828 char *zone;
2829 time_t time;
2830
2831 if (!secs || secs[1] != ' ')
2832 break;
2833
2834 secs += 2;
2835 time = (time_t) atol(secs);
2836 zone = strchr(secs, ' ');
2837 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2838 long tz;
2839
2840 zone++;
2841 tz = ('0' - zone[1]) * 60 * 60 * 10;
2842 tz += ('0' - zone[2]) * 60 * 60;
2843 tz += ('0' - zone[3]) * 60;
2844 tz += ('0' - zone[4]) * 60;
2845
2846 if (zone[0] == '-')
2847 tz = -tz;
2848
2849 time -= tz;
2850 }
2851 gmtime_r(&time, &commit->time);
2852 }
2853 break;
2854 }
2855 default:
2856 if (!commit)
2857 break;
2858
2859 /* Fill in the commit title if it has not already been set. */
2860 if (commit->title[0])
2861 break;
2862
2863 /* Require titles to start with a non-space character at the
2864 * offset used by git log. */
2865 /* FIXME: More gracefull handling of titles; append "..." to
2866 * shortened titles, etc. */
2867 if (strncmp(line, " ", 4) ||
2868 isspace(line[4]))
2869 break;
2870
2871 string_copy(commit->title, line + 4);
2872 }
2873
2874 return TRUE;
2875 }
2876
2877 static bool
2878 main_enter(struct view *view, struct line *line)
2879 {
2880 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2881
2882 open_view(view, REQ_VIEW_DIFF, flags);
2883 return TRUE;
2884 }
2885
2886 static bool
2887 main_grep(struct view *view, struct line *line)
2888 {
2889 struct commit *commit = line->data;
2890 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
2891 char buf[DATE_COLS + 1];
2892 regmatch_t pmatch;
2893
2894 for (state = S_TITLE; state < S_END; state++) {
2895 char *text;
2896
2897 switch (state) {
2898 case S_TITLE: text = commit->title; break;
2899 case S_AUTHOR: text = commit->author; break;
2900 case S_DATE:
2901 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
2902 continue;
2903 text = buf;
2904 break;
2905
2906 default:
2907 return FALSE;
2908 }
2909
2910 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
2911 return TRUE;
2912 }
2913
2914 return FALSE;
2915 }
2916
2917 static void
2918 main_select(struct view *view, struct line *line)
2919 {
2920 struct commit *commit = line->data;
2921
2922 string_copy(view->ref, commit->id);
2923 string_copy(ref_commit, view->ref);
2924 }
2925
2926 static struct view_ops main_ops = {
2927 "commit",
2928 main_draw,
2929 main_read,
2930 main_enter,
2931 main_grep,
2932 main_select,
2933 };
2934
2935
2936 /*
2937 * Unicode / UTF-8 handling
2938 *
2939 * NOTE: Much of the following code for dealing with unicode is derived from
2940 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2941 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2942 */
2943
2944 /* I've (over)annotated a lot of code snippets because I am not entirely
2945 * confident that the approach taken by this small UTF-8 interface is correct.
2946 * --jonas */
2947
2948 static inline int
2949 unicode_width(unsigned long c)
2950 {
2951 if (c >= 0x1100 &&
2952 (c <= 0x115f /* Hangul Jamo */
2953 || c == 0x2329
2954 || c == 0x232a
2955 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2956 /* CJK ... Yi */
2957 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2958 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2959 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2960 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2961 || (c >= 0xffe0 && c <= 0xffe6)
2962 || (c >= 0x20000 && c <= 0x2fffd)
2963 || (c >= 0x30000 && c <= 0x3fffd)))
2964 return 2;
2965
2966 return 1;
2967 }
2968
2969 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2970 * Illegal bytes are set one. */
2971 static const unsigned char utf8_bytes[256] = {
2972 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,
2973 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2974 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2975 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2976 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2977 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2978 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,
2979 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,
2980 };
2981
2982 /* Decode UTF-8 multi-byte representation into a unicode character. */
2983 static inline unsigned long
2984 utf8_to_unicode(const char *string, size_t length)
2985 {
2986 unsigned long unicode;
2987
2988 switch (length) {
2989 case 1:
2990 unicode = string[0];
2991 break;
2992 case 2:
2993 unicode = (string[0] & 0x1f) << 6;
2994 unicode += (string[1] & 0x3f);
2995 break;
2996 case 3:
2997 unicode = (string[0] & 0x0f) << 12;
2998 unicode += ((string[1] & 0x3f) << 6);
2999 unicode += (string[2] & 0x3f);
3000 break;
3001 case 4:
3002 unicode = (string[0] & 0x0f) << 18;
3003 unicode += ((string[1] & 0x3f) << 12);
3004 unicode += ((string[2] & 0x3f) << 6);
3005 unicode += (string[3] & 0x3f);
3006 break;
3007 case 5:
3008 unicode = (string[0] & 0x0f) << 24;
3009 unicode += ((string[1] & 0x3f) << 18);
3010 unicode += ((string[2] & 0x3f) << 12);
3011 unicode += ((string[3] & 0x3f) << 6);
3012 unicode += (string[4] & 0x3f);
3013 break;
3014 case 6:
3015 unicode = (string[0] & 0x01) << 30;
3016 unicode += ((string[1] & 0x3f) << 24);
3017 unicode += ((string[2] & 0x3f) << 18);
3018 unicode += ((string[3] & 0x3f) << 12);
3019 unicode += ((string[4] & 0x3f) << 6);
3020 unicode += (string[5] & 0x3f);
3021 break;
3022 default:
3023 die("Invalid unicode length");
3024 }
3025
3026 /* Invalid characters could return the special 0xfffd value but NUL
3027 * should be just as good. */
3028 return unicode > 0xffff ? 0 : unicode;
3029 }
3030
3031 /* Calculates how much of string can be shown within the given maximum width
3032 * and sets trimmed parameter to non-zero value if all of string could not be
3033 * shown.
3034 *
3035 * Additionally, adds to coloffset how many many columns to move to align with
3036 * the expected position. Takes into account how multi-byte and double-width
3037 * characters will effect the cursor position.
3038 *
3039 * Returns the number of bytes to output from string to satisfy max_width. */
3040 static size_t
3041 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3042 {
3043 const char *start = string;
3044 const char *end = strchr(string, '\0');
3045 size_t mbwidth = 0;
3046 size_t width = 0;
3047
3048 *trimmed = 0;
3049
3050 while (string < end) {
3051 int c = *(unsigned char *) string;
3052 unsigned char bytes = utf8_bytes[c];
3053 size_t ucwidth;
3054 unsigned long unicode;
3055
3056 if (string + bytes > end)
3057 break;
3058
3059 /* Change representation to figure out whether
3060 * it is a single- or double-width character. */
3061
3062 unicode = utf8_to_unicode(string, bytes);
3063 /* FIXME: Graceful handling of invalid unicode character. */
3064 if (!unicode)
3065 break;
3066
3067 ucwidth = unicode_width(unicode);
3068 width += ucwidth;
3069 if (width > max_width) {
3070 *trimmed = 1;
3071 break;
3072 }
3073
3074 /* The column offset collects the differences between the
3075 * number of bytes encoding a character and the number of
3076 * columns will be used for rendering said character.
3077 *
3078 * So if some character A is encoded in 2 bytes, but will be
3079 * represented on the screen using only 1 byte this will and up
3080 * adding 1 to the multi-byte column offset.
3081 *
3082 * Assumes that no double-width character can be encoding in
3083 * less than two bytes. */
3084 if (bytes > ucwidth)
3085 mbwidth += bytes - ucwidth;
3086
3087 string += bytes;
3088 }
3089
3090 *coloffset += mbwidth;
3091
3092 return string - start;
3093 }
3094
3095
3096 /*
3097 * Status management
3098 */
3099
3100 /* Whether or not the curses interface has been initialized. */
3101 static bool cursed = FALSE;
3102
3103 /* The status window is used for polling keystrokes. */
3104 static WINDOW *status_win;
3105
3106 /* Update status and title window. */
3107 static void
3108 report(const char *msg, ...)
3109 {
3110 static bool empty = TRUE;
3111 struct view *view = display[current_view];
3112
3113 if (!empty || *msg) {
3114 va_list args;
3115
3116 va_start(args, msg);
3117
3118 werase(status_win);
3119 wmove(status_win, 0, 0);
3120 if (*msg) {
3121 vwprintw(status_win, msg, args);
3122 empty = FALSE;
3123 } else {
3124 empty = TRUE;
3125 }
3126 wrefresh(status_win);
3127
3128 va_end(args);
3129 }
3130
3131 update_view_title(view);
3132 update_display_cursor();
3133 }
3134
3135 /* Controls when nodelay should be in effect when polling user input. */
3136 static void
3137 set_nonblocking_input(bool loading)
3138 {
3139 static unsigned int loading_views;
3140
3141 if ((loading == FALSE && loading_views-- == 1) ||
3142 (loading == TRUE && loading_views++ == 0))
3143 nodelay(status_win, loading);
3144 }
3145
3146 static void
3147 init_display(void)
3148 {
3149 int x, y;
3150
3151 /* Initialize the curses library */
3152 if (isatty(STDIN_FILENO)) {
3153 cursed = !!initscr();
3154 } else {
3155 /* Leave stdin and stdout alone when acting as a pager. */
3156 FILE *io = fopen("/dev/tty", "r+");
3157
3158 if (!io)
3159 die("Failed to open /dev/tty");
3160 cursed = !!newterm(NULL, io, io);
3161 }
3162
3163 if (!cursed)
3164 die("Failed to initialize curses");
3165
3166 nonl(); /* Tell curses not to do NL->CR/NL on output */
3167 cbreak(); /* Take input chars one at a time, no wait for \n */
3168 noecho(); /* Don't echo input */
3169 leaveok(stdscr, TRUE);
3170
3171 if (has_colors())
3172 init_colors();
3173
3174 getmaxyx(stdscr, y, x);
3175 status_win = newwin(1, 0, y - 1, 0);
3176 if (!status_win)
3177 die("Failed to create status window");
3178
3179 /* Enable keyboard mapping */
3180 keypad(status_win, TRUE);
3181 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3182 }
3183
3184 static char *
3185 read_prompt(const char *prompt)
3186 {
3187 enum { READING, STOP, CANCEL } status = READING;
3188 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3189 int pos = 0;
3190
3191 while (status == READING) {
3192 struct view *view;
3193 int i, key;
3194
3195 foreach_view (view, i)
3196 update_view(view);
3197
3198 report("%s%.*s", prompt, pos, buf);
3199 /* Refresh, accept single keystroke of input */
3200 key = wgetch(status_win);
3201 switch (key) {
3202 case KEY_RETURN:
3203 case KEY_ENTER:
3204 case '\n':
3205 status = pos ? STOP : CANCEL;
3206 break;
3207
3208 case KEY_BACKSPACE:
3209 if (pos > 0)
3210 pos--;
3211 else
3212 status = CANCEL;
3213 break;
3214
3215 case KEY_ESC:
3216 status = CANCEL;
3217 break;
3218
3219 case ERR:
3220 break;
3221
3222 default:
3223 if (pos >= sizeof(buf)) {
3224 report("Input string too long");
3225 return NULL;
3226 }
3227
3228 if (isprint(key))
3229 buf[pos++] = (char) key;
3230 }
3231 }
3232
3233 if (status == CANCEL) {
3234 /* Clear the status window */
3235 report("");
3236 return NULL;
3237 }
3238
3239 buf[pos++] = 0;
3240
3241 return buf;
3242 }
3243
3244 /*
3245 * Repository references
3246 */
3247
3248 static struct ref *refs;
3249 static size_t refs_size;
3250
3251 /* Id <-> ref store */
3252 static struct ref ***id_refs;
3253 static size_t id_refs_size;
3254
3255 static struct ref **
3256 get_refs(char *id)
3257 {
3258 struct ref ***tmp_id_refs;
3259 struct ref **ref_list = NULL;
3260 size_t ref_list_size = 0;
3261 size_t i;
3262
3263 for (i = 0; i < id_refs_size; i++)
3264 if (!strcmp(id, id_refs[i][0]->id))
3265 return id_refs[i];
3266
3267 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3268 if (!tmp_id_refs)
3269 return NULL;
3270
3271 id_refs = tmp_id_refs;
3272
3273 for (i = 0; i < refs_size; i++) {
3274 struct ref **tmp;
3275
3276 if (strcmp(id, refs[i].id))
3277 continue;
3278
3279 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3280 if (!tmp) {
3281 if (ref_list)
3282 free(ref_list);
3283 return NULL;
3284 }
3285
3286 ref_list = tmp;
3287 if (ref_list_size > 0)
3288 ref_list[ref_list_size - 1]->next = 1;
3289 ref_list[ref_list_size] = &refs[i];
3290
3291 /* XXX: The properties of the commit chains ensures that we can
3292 * safely modify the shared ref. The repo references will
3293 * always be similar for the same id. */
3294 ref_list[ref_list_size]->next = 0;
3295 ref_list_size++;
3296 }
3297
3298 if (ref_list)
3299 id_refs[id_refs_size++] = ref_list;
3300
3301 return ref_list;
3302 }
3303
3304 static int
3305 read_ref(char *id, int idlen, char *name, int namelen)
3306 {
3307 struct ref *ref;
3308 bool tag = FALSE;
3309
3310 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3311 /* Commits referenced by tags has "^{}" appended. */
3312 if (name[namelen - 1] != '}')
3313 return OK;
3314
3315 while (namelen > 0 && name[namelen] != '^')
3316 namelen--;
3317
3318 tag = TRUE;
3319 namelen -= STRING_SIZE("refs/tags/");
3320 name += STRING_SIZE("refs/tags/");
3321
3322 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3323 namelen -= STRING_SIZE("refs/heads/");
3324 name += STRING_SIZE("refs/heads/");
3325
3326 } else if (!strcmp(name, "HEAD")) {
3327 return OK;
3328 }
3329
3330 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3331 if (!refs)
3332 return ERR;
3333
3334 ref = &refs[refs_size++];
3335 ref->name = malloc(namelen + 1);
3336 if (!ref->name)
3337 return ERR;
3338
3339 strncpy(ref->name, name, namelen);
3340 ref->name[namelen] = 0;
3341 ref->tag = tag;
3342 string_copy(ref->id, id);
3343
3344 return OK;
3345 }
3346
3347 static int
3348 load_refs(void)
3349 {
3350 const char *cmd_env = getenv("TIG_LS_REMOTE");
3351 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3352
3353 return read_properties(popen(cmd, "r"), "\t", read_ref);
3354 }
3355
3356 static int
3357 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3358 {
3359 if (!strcmp(name, "i18n.commitencoding"))
3360 string_copy(opt_encoding, value);
3361
3362 return OK;
3363 }
3364
3365 static int
3366 load_repo_config(void)
3367 {
3368 return read_properties(popen("git repo-config --list", "r"),
3369 "=", read_repo_config_option);
3370 }
3371
3372 static int
3373 read_properties(FILE *pipe, const char *separators,
3374 int (*read_property)(char *, int, char *, int))
3375 {
3376 char buffer[BUFSIZ];
3377 char *name;
3378 int state = OK;
3379
3380 if (!pipe)
3381 return ERR;
3382
3383 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3384 char *value;
3385 size_t namelen;
3386 size_t valuelen;
3387
3388 name = chomp_string(name);
3389 namelen = strcspn(name, separators);
3390
3391 if (name[namelen]) {
3392 name[namelen] = 0;
3393 value = chomp_string(name + namelen + 1);
3394 valuelen = strlen(value);
3395
3396 } else {
3397 value = "";
3398 valuelen = 0;
3399 }
3400
3401 state = read_property(name, namelen, value, valuelen);
3402 }
3403
3404 if (state != ERR && ferror(pipe))
3405 state = ERR;
3406
3407 pclose(pipe);
3408
3409 return state;
3410 }
3411
3412
3413 /*
3414 * Main
3415 */
3416
3417 static void __NORETURN
3418 quit(int sig)
3419 {
3420 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3421 if (cursed)
3422 endwin();
3423 exit(0);
3424 }
3425
3426 static void __NORETURN
3427 die(const char *err, ...)
3428 {
3429 va_list args;
3430
3431 endwin();
3432
3433 va_start(args, err);
3434 fputs("tig: ", stderr);
3435 vfprintf(stderr, err, args);
3436 fputs("\n", stderr);
3437 va_end(args);
3438
3439 exit(1);
3440 }
3441
3442 int
3443 main(int argc, char *argv[])
3444 {
3445 struct view *view;
3446 enum request request;
3447 size_t i;
3448
3449 signal(SIGINT, quit);
3450
3451 if (setlocale(LC_ALL, "")) {
3452 string_copy(opt_codeset, nl_langinfo(CODESET));
3453 }
3454
3455 if (load_options() == ERR)
3456 die("Failed to load user config.");
3457
3458 /* Load the repo config file so options can be overwritten from
3459 * the command line. */
3460 if (load_repo_config() == ERR)
3461 die("Failed to load repo config.");
3462
3463 if (!parse_options(argc, argv))
3464 return 0;
3465
3466 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3467 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3468 if (opt_iconv == ICONV_NONE)
3469 die("Failed to initialize character set conversion");
3470 }
3471
3472 if (load_refs() == ERR)
3473 die("Failed to load refs.");
3474
3475 /* Require a git repository unless when running in pager mode. */
3476 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3477 die("Not a git repository");
3478
3479 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3480 view->cmd_env = getenv(view->cmd_env);
3481
3482 request = opt_request;
3483
3484 init_display();
3485
3486 while (view_driver(display[current_view], request)) {
3487 int key;
3488 int i;
3489
3490 foreach_view (view, i)
3491 update_view(view);
3492
3493 /* Refresh, accept single keystroke of input */
3494 key = wgetch(status_win);
3495
3496 request = get_keybinding(display[current_view]->keymap, key);
3497
3498 /* Some low-level request handling. This keeps access to
3499 * status_win restricted. */
3500 switch (request) {
3501 case REQ_PROMPT:
3502 {
3503 char *cmd = read_prompt(":");
3504
3505 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3506 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3507 opt_request = REQ_VIEW_DIFF;
3508 } else {
3509 opt_request = REQ_VIEW_PAGER;
3510 }
3511 break;
3512 }
3513
3514 request = REQ_NONE;
3515 break;
3516 }
3517 case REQ_SEARCH:
3518 case REQ_SEARCH_BACK:
3519 {
3520 const char *prompt = request == REQ_SEARCH
3521 ? "/" : "?";
3522 char *search = read_prompt(prompt);
3523
3524 if (search)
3525 string_copy(opt_search, search);
3526 else
3527 request = REQ_NONE;
3528 break;
3529 }
3530 case REQ_SCREEN_RESIZE:
3531 {
3532 int height, width;
3533
3534 getmaxyx(stdscr, height, width);
3535
3536 /* Resize the status view and let the view driver take
3537 * care of resizing the displayed views. */
3538 wresize(status_win, 1, width);
3539 mvwin(status_win, height - 1, 0);
3540 wrefresh(status_win);
3541 break;
3542 }
3543 default:
3544 break;
3545 }
3546 }
3547
3548 quit(0);
3549
3550 return 0;
3551 }
Full-screen terminal Git browser.