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