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