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SIZEOF_REV introduced: 41 bytes of pure madness!
[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
1269 assert(view_is_displayed(view));
1270
1271 if (view->offset + lineno >= view->lines)
1272 return FALSE;
1273
1274 line = &view->line[view->offset + lineno];
1275
1276 if (selected) {
1277 line->selected = TRUE;
1278 view->ops->select(view, line);
1279 } else if (line->selected) {
1280 line->selected = FALSE;
1281 wmove(view->win, lineno, 0);
1282 wclrtoeol(view->win);
1283 }
1284
1285 return view->ops->draw(view, line, lineno, selected);
1286 }
1287
1288 static void
1289 redraw_view_from(struct view *view, int lineno)
1290 {
1291 assert(0 <= lineno && lineno < view->height);
1292
1293 for (; lineno < view->height; lineno++) {
1294 if (!draw_view_line(view, lineno))
1295 break;
1296 }
1297
1298 redrawwin(view->win);
1299 wrefresh(view->win);
1300 }
1301
1302 static void
1303 redraw_view(struct view *view)
1304 {
1305 wclear(view->win);
1306 redraw_view_from(view, 0);
1307 }
1308
1309
1310 static void
1311 update_view_title(struct view *view)
1312 {
1313 assert(view_is_displayed(view));
1314
1315 if (view == display[current_view])
1316 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1317 else
1318 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1319
1320 werase(view->title);
1321 wmove(view->title, 0, 0);
1322
1323 if (*view->ref)
1324 wprintw(view->title, "[%s] %s", view->name, view->ref);
1325 else
1326 wprintw(view->title, "[%s]", view->name);
1327
1328 if (view->lines || view->pipe) {
1329 unsigned int view_lines = view->offset + view->height;
1330 unsigned int lines = view->lines
1331 ? MIN(view_lines, view->lines) * 100 / view->lines
1332 : 0;
1333
1334 wprintw(view->title, " - %s %d of %d (%d%%)",
1335 view->ops->type,
1336 view->lineno + 1,
1337 view->lines,
1338 lines);
1339 }
1340
1341 if (view->pipe) {
1342 time_t secs = time(NULL) - view->start_time;
1343
1344 /* Three git seconds are a long time ... */
1345 if (secs > 2)
1346 wprintw(view->title, " %lds", secs);
1347 }
1348
1349 wmove(view->title, 0, view->width - 1);
1350 wrefresh(view->title);
1351 }
1352
1353 static void
1354 resize_display(void)
1355 {
1356 int offset, i;
1357 struct view *base = display[0];
1358 struct view *view = display[1] ? display[1] : display[0];
1359
1360 /* Setup window dimensions */
1361
1362 getmaxyx(stdscr, base->height, base->width);
1363
1364 /* Make room for the status window. */
1365 base->height -= 1;
1366
1367 if (view != base) {
1368 /* Horizontal split. */
1369 view->width = base->width;
1370 view->height = SCALE_SPLIT_VIEW(base->height);
1371 base->height -= view->height;
1372
1373 /* Make room for the title bar. */
1374 view->height -= 1;
1375 }
1376
1377 /* Make room for the title bar. */
1378 base->height -= 1;
1379
1380 offset = 0;
1381
1382 foreach_displayed_view (view, i) {
1383 if (!view->win) {
1384 view->win = newwin(view->height, 0, offset, 0);
1385 if (!view->win)
1386 die("Failed to create %s view", view->name);
1387
1388 scrollok(view->win, TRUE);
1389
1390 view->title = newwin(1, 0, offset + view->height, 0);
1391 if (!view->title)
1392 die("Failed to create title window");
1393
1394 } else {
1395 wresize(view->win, view->height, view->width);
1396 mvwin(view->win, offset, 0);
1397 mvwin(view->title, offset + view->height, 0);
1398 }
1399
1400 offset += view->height + 1;
1401 }
1402 }
1403
1404 static void
1405 redraw_display(void)
1406 {
1407 struct view *view;
1408 int i;
1409
1410 foreach_displayed_view (view, i) {
1411 redraw_view(view);
1412 update_view_title(view);
1413 }
1414 }
1415
1416 static void
1417 update_display_cursor(void)
1418 {
1419 struct view *view = display[current_view];
1420
1421 /* Move the cursor to the right-most column of the cursor line.
1422 *
1423 * XXX: This could turn out to be a bit expensive, but it ensures that
1424 * the cursor does not jump around. */
1425 if (view->lines) {
1426 wmove(view->win, view->lineno - view->offset, view->width - 1);
1427 wrefresh(view->win);
1428 }
1429 }
1430
1431 /*
1432 * Navigation
1433 */
1434
1435 /* Scrolling backend */
1436 static void
1437 do_scroll_view(struct view *view, int lines)
1438 {
1439 bool redraw_current_line = FALSE;
1440
1441 /* The rendering expects the new offset. */
1442 view->offset += lines;
1443
1444 assert(0 <= view->offset && view->offset < view->lines);
1445 assert(lines);
1446
1447 /* Move current line into the view. */
1448 if (view->lineno < view->offset) {
1449 view->lineno = view->offset;
1450 redraw_current_line = TRUE;
1451 } else if (view->lineno >= view->offset + view->height) {
1452 view->lineno = view->offset + view->height - 1;
1453 redraw_current_line = TRUE;
1454 }
1455
1456 assert(view->offset <= view->lineno && view->lineno < view->lines);
1457
1458 /* Redraw the whole screen if scrolling is pointless. */
1459 if (view->height < ABS(lines)) {
1460 redraw_view(view);
1461
1462 } else {
1463 int line = lines > 0 ? view->height - lines : 0;
1464 int end = line + ABS(lines);
1465
1466 wscrl(view->win, lines);
1467
1468 for (; line < end; line++) {
1469 if (!draw_view_line(view, line))
1470 break;
1471 }
1472
1473 if (redraw_current_line)
1474 draw_view_line(view, view->lineno - view->offset);
1475 }
1476
1477 redrawwin(view->win);
1478 wrefresh(view->win);
1479 report("");
1480 }
1481
1482 /* Scroll frontend */
1483 static void
1484 scroll_view(struct view *view, enum request request)
1485 {
1486 int lines = 1;
1487
1488 assert(view_is_displayed(view));
1489
1490 switch (request) {
1491 case REQ_SCROLL_PAGE_DOWN:
1492 lines = view->height;
1493 case REQ_SCROLL_LINE_DOWN:
1494 if (view->offset + lines > view->lines)
1495 lines = view->lines - view->offset;
1496
1497 if (lines == 0 || view->offset + view->height >= view->lines) {
1498 report("Cannot scroll beyond the last line");
1499 return;
1500 }
1501 break;
1502
1503 case REQ_SCROLL_PAGE_UP:
1504 lines = view->height;
1505 case REQ_SCROLL_LINE_UP:
1506 if (lines > view->offset)
1507 lines = view->offset;
1508
1509 if (lines == 0) {
1510 report("Cannot scroll beyond the first line");
1511 return;
1512 }
1513
1514 lines = -lines;
1515 break;
1516
1517 default:
1518 die("request %d not handled in switch", request);
1519 }
1520
1521 do_scroll_view(view, lines);
1522 }
1523
1524 /* Cursor moving */
1525 static void
1526 move_view(struct view *view, enum request request)
1527 {
1528 int scroll_steps = 0;
1529 int steps;
1530
1531 switch (request) {
1532 case REQ_MOVE_FIRST_LINE:
1533 steps = -view->lineno;
1534 break;
1535
1536 case REQ_MOVE_LAST_LINE:
1537 steps = view->lines - view->lineno - 1;
1538 break;
1539
1540 case REQ_MOVE_PAGE_UP:
1541 steps = view->height > view->lineno
1542 ? -view->lineno : -view->height;
1543 break;
1544
1545 case REQ_MOVE_PAGE_DOWN:
1546 steps = view->lineno + view->height >= view->lines
1547 ? view->lines - view->lineno - 1 : view->height;
1548 break;
1549
1550 case REQ_MOVE_UP:
1551 steps = -1;
1552 break;
1553
1554 case REQ_MOVE_DOWN:
1555 steps = 1;
1556 break;
1557
1558 default:
1559 die("request %d not handled in switch", request);
1560 }
1561
1562 if (steps <= 0 && view->lineno == 0) {
1563 report("Cannot move beyond the first line");
1564 return;
1565
1566 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1567 report("Cannot move beyond the last line");
1568 return;
1569 }
1570
1571 /* Move the current line */
1572 view->lineno += steps;
1573 assert(0 <= view->lineno && view->lineno < view->lines);
1574
1575 /* Check whether the view needs to be scrolled */
1576 if (view->lineno < view->offset ||
1577 view->lineno >= view->offset + view->height) {
1578 scroll_steps = steps;
1579 if (steps < 0 && -steps > view->offset) {
1580 scroll_steps = -view->offset;
1581
1582 } else if (steps > 0) {
1583 if (view->lineno == view->lines - 1 &&
1584 view->lines > view->height) {
1585 scroll_steps = view->lines - view->offset - 1;
1586 if (scroll_steps >= view->height)
1587 scroll_steps -= view->height - 1;
1588 }
1589 }
1590 }
1591
1592 if (!view_is_displayed(view)) {
1593 view->offset += steps;
1594 view->ops->select(view, &view->line[view->lineno]);
1595 return;
1596 }
1597
1598 /* Repaint the old "current" line if we be scrolling */
1599 if (ABS(steps) < view->height)
1600 draw_view_line(view, view->lineno - steps - view->offset);
1601
1602 if (scroll_steps) {
1603 do_scroll_view(view, scroll_steps);
1604 return;
1605 }
1606
1607 /* Draw the current line */
1608 draw_view_line(view, view->lineno - view->offset);
1609
1610 redrawwin(view->win);
1611 wrefresh(view->win);
1612 report("");
1613 }
1614
1615
1616 /*
1617 * Searching
1618 */
1619
1620 static void search_view(struct view *view, enum request request);
1621
1622 static bool
1623 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1624 {
1625 assert(view_is_displayed(view));
1626
1627 if (!view->ops->grep(view, line))
1628 return FALSE;
1629
1630 if (lineno - view->offset >= view->height) {
1631 view->offset = lineno;
1632 view->lineno = lineno;
1633 redraw_view(view);
1634
1635 } else {
1636 unsigned long old_lineno = view->lineno - view->offset;
1637
1638 view->lineno = lineno;
1639 draw_view_line(view, old_lineno);
1640
1641 draw_view_line(view, view->lineno - view->offset);
1642 redrawwin(view->win);
1643 wrefresh(view->win);
1644 }
1645
1646 report("Line %ld matches '%s'", lineno + 1, view->grep);
1647 return TRUE;
1648 }
1649
1650 static void
1651 find_next(struct view *view, enum request request)
1652 {
1653 unsigned long lineno = view->lineno;
1654 int direction;
1655
1656 if (!*view->grep) {
1657 if (!*opt_search)
1658 report("No previous search");
1659 else
1660 search_view(view, request);
1661 return;
1662 }
1663
1664 switch (request) {
1665 case REQ_SEARCH:
1666 case REQ_FIND_NEXT:
1667 direction = 1;
1668 break;
1669
1670 case REQ_SEARCH_BACK:
1671 case REQ_FIND_PREV:
1672 direction = -1;
1673 break;
1674
1675 default:
1676 return;
1677 }
1678
1679 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1680 lineno += direction;
1681
1682 /* Note, lineno is unsigned long so will wrap around in which case it
1683 * will become bigger than view->lines. */
1684 for (; lineno < view->lines; lineno += direction) {
1685 struct line *line = &view->line[lineno];
1686
1687 if (find_next_line(view, lineno, line))
1688 return;
1689 }
1690
1691 report("No match found for '%s'", view->grep);
1692 }
1693
1694 static void
1695 search_view(struct view *view, enum request request)
1696 {
1697 int regex_err;
1698
1699 if (view->regex) {
1700 regfree(view->regex);
1701 *view->grep = 0;
1702 } else {
1703 view->regex = calloc(1, sizeof(*view->regex));
1704 if (!view->regex)
1705 return;
1706 }
1707
1708 regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
1709 if (regex_err != 0) {
1710 char buf[SIZEOF_STR] = "unknown error";
1711
1712 regerror(regex_err, view->regex, buf, sizeof(buf));
1713 report("Search failed: %s", buf);
1714 return;
1715 }
1716
1717 string_copy(view->grep, opt_search);
1718
1719 find_next(view, request);
1720 }
1721
1722 /*
1723 * Incremental updating
1724 */
1725
1726 static void
1727 end_update(struct view *view)
1728 {
1729 if (!view->pipe)
1730 return;
1731 set_nonblocking_input(FALSE);
1732 if (view->pipe == stdin)
1733 fclose(view->pipe);
1734 else
1735 pclose(view->pipe);
1736 view->pipe = NULL;
1737 }
1738
1739 static bool
1740 begin_update(struct view *view)
1741 {
1742 const char *id = view->id;
1743
1744 if (view->pipe)
1745 end_update(view);
1746
1747 if (opt_cmd[0]) {
1748 string_copy(view->cmd, opt_cmd);
1749 opt_cmd[0] = 0;
1750 /* When running random commands, the view ref could have become
1751 * invalid so clear it. */
1752 view->ref[0] = 0;
1753
1754 } else if (view == VIEW(REQ_VIEW_TREE)) {
1755 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1756
1757 if (strcmp(view->vid, view->id))
1758 opt_path[0] = 0;
1759
1760 if (!string_format(view->cmd, format, id, opt_path))
1761 return FALSE;
1762
1763 } else {
1764 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1765
1766 if (!string_format(view->cmd, format, id, id, id, id, id))
1767 return FALSE;
1768 }
1769
1770 /* Special case for the pager view. */
1771 if (opt_pipe) {
1772 view->pipe = opt_pipe;
1773 opt_pipe = NULL;
1774 } else {
1775 view->pipe = popen(view->cmd, "r");
1776 }
1777
1778 if (!view->pipe)
1779 return FALSE;
1780
1781 set_nonblocking_input(TRUE);
1782
1783 view->offset = 0;
1784 view->lines = 0;
1785 view->lineno = 0;
1786 string_copy(view->vid, id);
1787
1788 if (view->line) {
1789 int i;
1790
1791 for (i = 0; i < view->lines; i++)
1792 if (view->line[i].data)
1793 free(view->line[i].data);
1794
1795 free(view->line);
1796 view->line = NULL;
1797 }
1798
1799 view->start_time = time(NULL);
1800
1801 return TRUE;
1802 }
1803
1804 static struct line *
1805 realloc_lines(struct view *view, size_t line_size)
1806 {
1807 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1808
1809 if (!tmp)
1810 return NULL;
1811
1812 view->line = tmp;
1813 view->line_size = line_size;
1814 return view->line;
1815 }
1816
1817 static bool
1818 update_view(struct view *view)
1819 {
1820 char in_buffer[BUFSIZ];
1821 char out_buffer[BUFSIZ * 2];
1822 char *line;
1823 /* The number of lines to read. If too low it will cause too much
1824 * redrawing (and possible flickering), if too high responsiveness
1825 * will suffer. */
1826 unsigned long lines = view->height;
1827 int redraw_from = -1;
1828
1829 if (!view->pipe)
1830 return TRUE;
1831
1832 /* Only redraw if lines are visible. */
1833 if (view->offset + view->height >= view->lines)
1834 redraw_from = view->lines - view->offset;
1835
1836 /* FIXME: This is probably not perfect for backgrounded views. */
1837 if (!realloc_lines(view, view->lines + lines))
1838 goto alloc_error;
1839
1840 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1841 size_t linelen = strlen(line);
1842
1843 if (linelen)
1844 line[linelen - 1] = 0;
1845
1846 if (opt_iconv != ICONV_NONE) {
1847 char *inbuf = line;
1848 size_t inlen = linelen;
1849
1850 char *outbuf = out_buffer;
1851 size_t outlen = sizeof(out_buffer);
1852
1853 size_t ret;
1854
1855 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1856 if (ret != (size_t) -1) {
1857 line = out_buffer;
1858 linelen = strlen(out_buffer);
1859 }
1860 }
1861
1862 if (!view->ops->read(view, line))
1863 goto alloc_error;
1864
1865 if (lines-- == 1)
1866 break;
1867 }
1868
1869 {
1870 int digits;
1871
1872 lines = view->lines;
1873 for (digits = 0; lines; digits++)
1874 lines /= 10;
1875
1876 /* Keep the displayed view in sync with line number scaling. */
1877 if (digits != view->digits) {
1878 view->digits = digits;
1879 redraw_from = 0;
1880 }
1881 }
1882
1883 if (!view_is_displayed(view))
1884 goto check_pipe;
1885
1886 if (view == VIEW(REQ_VIEW_TREE)) {
1887 /* Clear the view and redraw everything since the tree sorting
1888 * might have rearranged things. */
1889 redraw_view(view);
1890
1891 } else if (redraw_from >= 0) {
1892 /* If this is an incremental update, redraw the previous line
1893 * since for commits some members could have changed when
1894 * loading the main view. */
1895 if (redraw_from > 0)
1896 redraw_from--;
1897
1898 /* Incrementally draw avoids flickering. */
1899 redraw_view_from(view, redraw_from);
1900 }
1901
1902 /* Update the title _after_ the redraw so that if the redraw picks up a
1903 * commit reference in view->ref it'll be available here. */
1904 update_view_title(view);
1905
1906 check_pipe:
1907 if (ferror(view->pipe)) {
1908 report("Failed to read: %s", strerror(errno));
1909 goto end;
1910
1911 } else if (feof(view->pipe)) {
1912 report("");
1913 goto end;
1914 }
1915
1916 return TRUE;
1917
1918 alloc_error:
1919 report("Allocation failure");
1920
1921 end:
1922 end_update(view);
1923 return FALSE;
1924 }
1925
1926
1927 /*
1928 * View opening
1929 */
1930
1931 static void open_help_view(struct view *view)
1932 {
1933 char buf[BUFSIZ];
1934 int lines = ARRAY_SIZE(req_info) + 2;
1935 int i;
1936
1937 if (view->lines > 0)
1938 return;
1939
1940 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1941 if (!req_info[i].request)
1942 lines++;
1943
1944 view->line = calloc(lines, sizeof(*view->line));
1945 if (!view->line) {
1946 report("Allocation failure");
1947 return;
1948 }
1949
1950 view->ops->read(view, "Quick reference for tig keybindings:");
1951
1952 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1953 char *key;
1954
1955 if (!req_info[i].request) {
1956 view->ops->read(view, "");
1957 view->ops->read(view, req_info[i].help);
1958 continue;
1959 }
1960
1961 key = get_key(req_info[i].request);
1962 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1963 continue;
1964
1965 view->ops->read(view, buf);
1966 }
1967 }
1968
1969 enum open_flags {
1970 OPEN_DEFAULT = 0, /* Use default view switching. */
1971 OPEN_SPLIT = 1, /* Split current view. */
1972 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1973 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1974 };
1975
1976 static void
1977 open_view(struct view *prev, enum request request, enum open_flags flags)
1978 {
1979 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1980 bool split = !!(flags & OPEN_SPLIT);
1981 bool reload = !!(flags & OPEN_RELOAD);
1982 struct view *view = VIEW(request);
1983 int nviews = displayed_views();
1984 struct view *base_view = display[0];
1985
1986 if (view == prev && nviews == 1 && !reload) {
1987 report("Already in %s view", view->name);
1988 return;
1989 }
1990
1991 if (view == VIEW(REQ_VIEW_HELP)) {
1992 open_help_view(view);
1993
1994 } else if ((reload || strcmp(view->vid, view->id)) &&
1995 !begin_update(view)) {
1996 report("Failed to load %s view", view->name);
1997 return;
1998 }
1999
2000 if (split) {
2001 display[1] = view;
2002 if (!backgrounded)
2003 current_view = 1;
2004 } else {
2005 /* Maximize the current view. */
2006 memset(display, 0, sizeof(display));
2007 current_view = 0;
2008 display[current_view] = view;
2009 }
2010
2011 /* Resize the view when switching between split- and full-screen,
2012 * or when switching between two different full-screen views. */
2013 if (nviews != displayed_views() ||
2014 (nviews == 1 && base_view != display[0]))
2015 resize_display();
2016
2017 if (split && prev->lineno - prev->offset >= prev->height) {
2018 /* Take the title line into account. */
2019 int lines = prev->lineno - prev->offset - prev->height + 1;
2020
2021 /* Scroll the view that was split if the current line is
2022 * outside the new limited view. */
2023 do_scroll_view(prev, lines);
2024 }
2025
2026 if (prev && view != prev) {
2027 if (split && !backgrounded) {
2028 /* "Blur" the previous view. */
2029 update_view_title(prev);
2030 }
2031
2032 view->parent = prev;
2033 }
2034
2035 if (view->pipe && view->lines == 0) {
2036 /* Clear the old view and let the incremental updating refill
2037 * the screen. */
2038 wclear(view->win);
2039 report("");
2040 } else {
2041 redraw_view(view);
2042 report("");
2043 }
2044
2045 /* If the view is backgrounded the above calls to report()
2046 * won't redraw the view title. */
2047 if (backgrounded)
2048 update_view_title(view);
2049 }
2050
2051
2052 /*
2053 * User request switch noodle
2054 */
2055
2056 static int
2057 view_driver(struct view *view, enum request request)
2058 {
2059 int i;
2060
2061 switch (request) {
2062 case REQ_MOVE_UP:
2063 case REQ_MOVE_DOWN:
2064 case REQ_MOVE_PAGE_UP:
2065 case REQ_MOVE_PAGE_DOWN:
2066 case REQ_MOVE_FIRST_LINE:
2067 case REQ_MOVE_LAST_LINE:
2068 move_view(view, request);
2069 break;
2070
2071 case REQ_SCROLL_LINE_DOWN:
2072 case REQ_SCROLL_LINE_UP:
2073 case REQ_SCROLL_PAGE_DOWN:
2074 case REQ_SCROLL_PAGE_UP:
2075 scroll_view(view, request);
2076 break;
2077
2078 case REQ_VIEW_BLOB:
2079 if (!ref_blob[0]) {
2080 report("No file chosen, press 't' to open tree view");
2081 break;
2082 }
2083 /* Fall-through */
2084 case REQ_VIEW_MAIN:
2085 case REQ_VIEW_DIFF:
2086 case REQ_VIEW_LOG:
2087 case REQ_VIEW_TREE:
2088 case REQ_VIEW_HELP:
2089 case REQ_VIEW_PAGER:
2090 open_view(view, request, OPEN_DEFAULT);
2091 break;
2092
2093 case REQ_NEXT:
2094 case REQ_PREVIOUS:
2095 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2096
2097 if ((view == VIEW(REQ_VIEW_DIFF) &&
2098 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2099 (view == VIEW(REQ_VIEW_BLOB) &&
2100 view->parent == VIEW(REQ_VIEW_TREE))) {
2101 view = view->parent;
2102 move_view(view, request);
2103 if (view_is_displayed(view))
2104 update_view_title(view);
2105 } else {
2106 move_view(view, request);
2107 break;
2108 }
2109 /* Fall-through */
2110
2111 case REQ_ENTER:
2112 if (!view->lines) {
2113 report("Nothing to enter");
2114 break;
2115 }
2116 return view->ops->enter(view, &view->line[view->lineno]);
2117
2118 case REQ_VIEW_NEXT:
2119 {
2120 int nviews = displayed_views();
2121 int next_view = (current_view + 1) % nviews;
2122
2123 if (next_view == current_view) {
2124 report("Only one view is displayed");
2125 break;
2126 }
2127
2128 current_view = next_view;
2129 /* Blur out the title of the previous view. */
2130 update_view_title(view);
2131 report("");
2132 break;
2133 }
2134 case REQ_TOGGLE_LINENO:
2135 opt_line_number = !opt_line_number;
2136 redraw_display();
2137 break;
2138
2139 case REQ_TOGGLE_REV_GRAPH:
2140 opt_rev_graph = !opt_rev_graph;
2141 redraw_display();
2142 break;
2143
2144 case REQ_PROMPT:
2145 /* Always reload^Wrerun commands from the prompt. */
2146 open_view(view, opt_request, OPEN_RELOAD);
2147 break;
2148
2149 case REQ_SEARCH:
2150 case REQ_SEARCH_BACK:
2151 search_view(view, request);
2152 break;
2153
2154 case REQ_FIND_NEXT:
2155 case REQ_FIND_PREV:
2156 find_next(view, request);
2157 break;
2158
2159 case REQ_STOP_LOADING:
2160 for (i = 0; i < ARRAY_SIZE(views); i++) {
2161 view = &views[i];
2162 if (view->pipe)
2163 report("Stopped loading the %s view", view->name),
2164 end_update(view);
2165 }
2166 break;
2167
2168 case REQ_SHOW_VERSION:
2169 report("%s (built %s)", VERSION, __DATE__);
2170 return TRUE;
2171
2172 case REQ_SCREEN_RESIZE:
2173 resize_display();
2174 /* Fall-through */
2175 case REQ_SCREEN_REDRAW:
2176 redraw_display();
2177 break;
2178
2179 case REQ_NONE:
2180 doupdate();
2181 return TRUE;
2182
2183 case REQ_VIEW_CLOSE:
2184 /* XXX: Mark closed views by letting view->parent point to the
2185 * view itself. Parents to closed view should never be
2186 * followed. */
2187 if (view->parent &&
2188 view->parent->parent != view->parent) {
2189 memset(display, 0, sizeof(display));
2190 current_view = 0;
2191 display[current_view] = view->parent;
2192 view->parent = view;
2193 resize_display();
2194 redraw_display();
2195 break;
2196 }
2197 /* Fall-through */
2198 case REQ_QUIT:
2199 return FALSE;
2200
2201 default:
2202 /* An unknown key will show most commonly used commands. */
2203 report("Unknown key, press 'h' for help");
2204 return TRUE;
2205 }
2206
2207 return TRUE;
2208 }
2209
2210
2211 /*
2212 * Pager backend
2213 */
2214
2215 static bool
2216 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2217 {
2218 char *text = line->data;
2219 enum line_type type = line->type;
2220 int textlen = strlen(text);
2221 int attr;
2222
2223 wmove(view->win, lineno, 0);
2224
2225 if (selected) {
2226 type = LINE_CURSOR;
2227 wchgat(view->win, -1, 0, type, NULL);
2228 }
2229
2230 attr = get_line_attr(type);
2231 wattrset(view->win, attr);
2232
2233 if (opt_line_number || opt_tab_size < TABSIZE) {
2234 static char spaces[] = " ";
2235 int col_offset = 0, col = 0;
2236
2237 if (opt_line_number) {
2238 unsigned long real_lineno = view->offset + lineno + 1;
2239
2240 if (real_lineno == 1 ||
2241 (real_lineno % opt_num_interval) == 0) {
2242 wprintw(view->win, "%.*d", view->digits, real_lineno);
2243
2244 } else {
2245 waddnstr(view->win, spaces,
2246 MIN(view->digits, STRING_SIZE(spaces)));
2247 }
2248 waddstr(view->win, ": ");
2249 col_offset = view->digits + 2;
2250 }
2251
2252 while (text && col_offset + col < view->width) {
2253 int cols_max = view->width - col_offset - col;
2254 char *pos = text;
2255 int cols;
2256
2257 if (*text == '\t') {
2258 text++;
2259 assert(sizeof(spaces) > TABSIZE);
2260 pos = spaces;
2261 cols = opt_tab_size - (col % opt_tab_size);
2262
2263 } else {
2264 text = strchr(text, '\t');
2265 cols = line ? text - pos : strlen(pos);
2266 }
2267
2268 waddnstr(view->win, pos, MIN(cols, cols_max));
2269 col += cols;
2270 }
2271
2272 } else {
2273 int col = 0, pos = 0;
2274
2275 for (; pos < textlen && col < view->width; pos++, col++)
2276 if (text[pos] == '\t')
2277 col += TABSIZE - (col % TABSIZE) - 1;
2278
2279 waddnstr(view->win, text, pos);
2280 }
2281
2282 return TRUE;
2283 }
2284
2285 static bool
2286 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2287 {
2288 char refbuf[SIZEOF_STR];
2289 char *ref = NULL;
2290 FILE *pipe;
2291
2292 if (!string_format(refbuf, "git describe %s", commit_id))
2293 return TRUE;
2294
2295 pipe = popen(refbuf, "r");
2296 if (!pipe)
2297 return TRUE;
2298
2299 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2300 ref = chomp_string(ref);
2301 pclose(pipe);
2302
2303 if (!ref || !*ref)
2304 return TRUE;
2305
2306 /* This is the only fatal call, since it can "corrupt" the buffer. */
2307 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2308 return FALSE;
2309
2310 return TRUE;
2311 }
2312
2313 static void
2314 add_pager_refs(struct view *view, struct line *line)
2315 {
2316 char buf[SIZEOF_STR];
2317 char *commit_id = line->data + STRING_SIZE("commit ");
2318 struct ref **refs;
2319 size_t bufpos = 0, refpos = 0;
2320 const char *sep = "Refs: ";
2321 bool is_tag = FALSE;
2322
2323 assert(line->type == LINE_COMMIT);
2324
2325 refs = get_refs(commit_id);
2326 if (!refs) {
2327 if (view == VIEW(REQ_VIEW_DIFF))
2328 goto try_add_describe_ref;
2329 return;
2330 }
2331
2332 do {
2333 struct ref *ref = refs[refpos];
2334 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2335
2336 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2337 return;
2338 sep = ", ";
2339 if (ref->tag)
2340 is_tag = TRUE;
2341 } while (refs[refpos++]->next);
2342
2343 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2344 try_add_describe_ref:
2345 /* Add <tag>-g<commit_id> "fake" reference. */
2346 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2347 return;
2348 }
2349
2350 if (bufpos == 0)
2351 return;
2352
2353 if (!realloc_lines(view, view->line_size + 1))
2354 return;
2355
2356 line = &view->line[view->lines];
2357 line->data = strdup(buf);
2358 if (!line->data)
2359 return;
2360
2361 line->type = LINE_PP_REFS;
2362 view->lines++;
2363 }
2364
2365 static bool
2366 pager_read(struct view *view, char *data)
2367 {
2368 struct line *line = &view->line[view->lines];
2369
2370 line->data = strdup(data);
2371 if (!line->data)
2372 return FALSE;
2373
2374 line->type = get_line_type(line->data);
2375 view->lines++;
2376
2377 if (line->type == LINE_COMMIT &&
2378 (view == VIEW(REQ_VIEW_DIFF) ||
2379 view == VIEW(REQ_VIEW_LOG)))
2380 add_pager_refs(view, line);
2381
2382 return TRUE;
2383 }
2384
2385 static bool
2386 pager_enter(struct view *view, struct line *line)
2387 {
2388 int split = 0;
2389
2390 if (line->type == LINE_COMMIT &&
2391 (view == VIEW(REQ_VIEW_LOG) ||
2392 view == VIEW(REQ_VIEW_PAGER))) {
2393 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2394 split = 1;
2395 }
2396
2397 /* Always scroll the view even if it was split. That way
2398 * you can use Enter to scroll through the log view and
2399 * split open each commit diff. */
2400 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2401
2402 /* FIXME: A minor workaround. Scrolling the view will call report("")
2403 * but if we are scrolling a non-current view this won't properly
2404 * update the view title. */
2405 if (split)
2406 update_view_title(view);
2407
2408 return TRUE;
2409 }
2410
2411 static bool
2412 pager_grep(struct view *view, struct line *line)
2413 {
2414 regmatch_t pmatch;
2415 char *text = line->data;
2416
2417 if (!*text)
2418 return FALSE;
2419
2420 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2421 return FALSE;
2422
2423 return TRUE;
2424 }
2425
2426 static void
2427 pager_select(struct view *view, struct line *line)
2428 {
2429 if (line->type == LINE_COMMIT) {
2430 char *text = line->data;
2431
2432 string_copy(view->ref, text + STRING_SIZE("commit "));
2433 string_copy(ref_commit, view->ref);
2434 }
2435 }
2436
2437 static struct view_ops pager_ops = {
2438 "line",
2439 pager_draw,
2440 pager_read,
2441 pager_enter,
2442 pager_grep,
2443 pager_select,
2444 };
2445
2446
2447 /*
2448 * Tree backend
2449 */
2450
2451 /* Parse output from git-ls-tree(1):
2452 *
2453 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2454 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2455 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2456 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2457 */
2458
2459 #define SIZEOF_TREE_ATTR \
2460 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2461
2462 #define TREE_UP_FORMAT "040000 tree %s\t.."
2463
2464 static int
2465 tree_compare_entry(enum line_type type1, char *name1,
2466 enum line_type type2, char *name2)
2467 {
2468 if (type1 != type2) {
2469 if (type1 == LINE_TREE_DIR)
2470 return -1;
2471 return 1;
2472 }
2473
2474 return strcmp(name1, name2);
2475 }
2476
2477 static bool
2478 tree_read(struct view *view, char *text)
2479 {
2480 size_t textlen = strlen(text);
2481 char buf[SIZEOF_STR];
2482 unsigned long pos;
2483 enum line_type type;
2484 bool first_read = view->lines == 0;
2485
2486 if (textlen <= SIZEOF_TREE_ATTR)
2487 return FALSE;
2488
2489 type = text[STRING_SIZE("100644 ")] == 't'
2490 ? LINE_TREE_DIR : LINE_TREE_FILE;
2491
2492 if (first_read) {
2493 /* Add path info line */
2494 if (string_format(buf, "Directory path /%s", opt_path) &&
2495 realloc_lines(view, view->line_size + 1) &&
2496 pager_read(view, buf))
2497 view->line[view->lines - 1].type = LINE_DEFAULT;
2498 else
2499 return FALSE;
2500
2501 /* Insert "link" to parent directory. */
2502 if (*opt_path &&
2503 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2504 realloc_lines(view, view->line_size + 1) &&
2505 pager_read(view, buf))
2506 view->line[view->lines - 1].type = LINE_TREE_DIR;
2507 else if (*opt_path)
2508 return FALSE;
2509 }
2510
2511 /* Strip the path part ... */
2512 if (*opt_path) {
2513 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2514 size_t striplen = strlen(opt_path);
2515 char *path = text + SIZEOF_TREE_ATTR;
2516
2517 if (pathlen > striplen)
2518 memmove(path, path + striplen,
2519 pathlen - striplen + 1);
2520 }
2521
2522 /* Skip "Directory ..." and ".." line. */
2523 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2524 struct line *line = &view->line[pos];
2525 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2526 char *path2 = text + SIZEOF_TREE_ATTR;
2527 int cmp = tree_compare_entry(line->type, path1, type, path2);
2528
2529 if (cmp <= 0)
2530 continue;
2531
2532 text = strdup(text);
2533 if (!text)
2534 return FALSE;
2535
2536 if (view->lines > pos)
2537 memmove(&view->line[pos + 1], &view->line[pos],
2538 (view->lines - pos) * sizeof(*line));
2539
2540 line = &view->line[pos];
2541 line->data = text;
2542 line->type = type;
2543 view->lines++;
2544 return TRUE;
2545 }
2546
2547 if (!pager_read(view, text))
2548 return FALSE;
2549
2550 /* Move the current line to the first tree entry. */
2551 if (first_read)
2552 view->lineno++;
2553
2554 view->line[view->lines - 1].type = type;
2555 return TRUE;
2556 }
2557
2558 static bool
2559 tree_enter(struct view *view, struct line *line)
2560 {
2561 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2562 enum request request;
2563
2564 switch (line->type) {
2565 case LINE_TREE_DIR:
2566 /* Depending on whether it is a subdir or parent (updir?) link
2567 * mangle the path buffer. */
2568 if (line == &view->line[1] && *opt_path) {
2569 size_t path_len = strlen(opt_path);
2570 char *dirsep = opt_path + path_len - 1;
2571
2572 while (dirsep > opt_path && dirsep[-1] != '/')
2573 dirsep--;
2574
2575 dirsep[0] = 0;
2576
2577 } else {
2578 size_t pathlen = strlen(opt_path);
2579 size_t origlen = pathlen;
2580 char *data = line->data;
2581 char *basename = data + SIZEOF_TREE_ATTR;
2582
2583 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2584 opt_path[origlen] = 0;
2585 return TRUE;
2586 }
2587 }
2588
2589 /* Trees and subtrees share the same ID, so they are not not
2590 * unique like blobs. */
2591 flags |= OPEN_RELOAD;
2592 request = REQ_VIEW_TREE;
2593 break;
2594
2595 case LINE_TREE_FILE:
2596 request = REQ_VIEW_BLOB;
2597 break;
2598
2599 default:
2600 return TRUE;
2601 }
2602
2603 open_view(view, request, flags);
2604
2605 return TRUE;
2606 }
2607
2608 static void
2609 tree_select(struct view *view, struct line *line)
2610 {
2611 char *text = line->data;
2612
2613 text += STRING_SIZE("100644 blob ");
2614
2615 if (line->type == LINE_TREE_FILE) {
2616 string_ncopy(ref_blob, text, 40);
2617 /* Also update the blob view's ref, since all there must always
2618 * be in sync. */
2619 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2620
2621 } else if (line->type != LINE_TREE_DIR) {
2622 return;
2623 }
2624
2625 string_ncopy(view->ref, text, 40);
2626 }
2627
2628 static struct view_ops tree_ops = {
2629 "file",
2630 pager_draw,
2631 tree_read,
2632 tree_enter,
2633 pager_grep,
2634 tree_select,
2635 };
2636
2637 static bool
2638 blob_read(struct view *view, char *line)
2639 {
2640 bool state = pager_read(view, line);
2641
2642 if (state == TRUE)
2643 view->line[view->lines - 1].type = LINE_DEFAULT;
2644
2645 return state;
2646 }
2647
2648 static struct view_ops blob_ops = {
2649 "line",
2650 pager_draw,
2651 blob_read,
2652 pager_enter,
2653 pager_grep,
2654 pager_select,
2655 };
2656
2657
2658 /*
2659 * Main view backend
2660 */
2661
2662 struct commit {
2663 char id[SIZEOF_REV]; /* SHA1 ID. */
2664 char title[75]; /* First line of the commit message. */
2665 char author[75]; /* Author of the commit. */
2666 struct tm time; /* Date from the author ident. */
2667 struct ref **refs; /* Repository references. */
2668 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2669 size_t graph_size; /* The width of the graph array. */
2670 };
2671
2672 static bool
2673 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2674 {
2675 char buf[DATE_COLS + 1];
2676 struct commit *commit = line->data;
2677 enum line_type type;
2678 int col = 0;
2679 size_t timelen;
2680 size_t authorlen;
2681 int trimmed = 1;
2682
2683 if (!*commit->author)
2684 return FALSE;
2685
2686 wmove(view->win, lineno, col);
2687
2688 if (selected) {
2689 type = LINE_CURSOR;
2690 wattrset(view->win, get_line_attr(type));
2691 wchgat(view->win, -1, 0, type, NULL);
2692
2693 } else {
2694 type = LINE_MAIN_COMMIT;
2695 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2696 }
2697
2698 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2699 waddnstr(view->win, buf, timelen);
2700 waddstr(view->win, " ");
2701
2702 col += DATE_COLS;
2703 wmove(view->win, lineno, col);
2704 if (type != LINE_CURSOR)
2705 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2706
2707 if (opt_utf8) {
2708 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2709 } else {
2710 authorlen = strlen(commit->author);
2711 if (authorlen > AUTHOR_COLS - 2) {
2712 authorlen = AUTHOR_COLS - 2;
2713 trimmed = 1;
2714 }
2715 }
2716
2717 if (trimmed) {
2718 waddnstr(view->win, commit->author, authorlen);
2719 if (type != LINE_CURSOR)
2720 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2721 waddch(view->win, '~');
2722 } else {
2723 waddstr(view->win, commit->author);
2724 }
2725
2726 col += AUTHOR_COLS;
2727 if (type != LINE_CURSOR)
2728 wattrset(view->win, A_NORMAL);
2729
2730 if (opt_rev_graph && commit->graph_size) {
2731 size_t i;
2732
2733 wmove(view->win, lineno, col);
2734 /* Using waddch() instead of waddnstr() ensures that
2735 * they'll be rendered correctly for the cursor line. */
2736 for (i = 0; i < commit->graph_size; i++)
2737 waddch(view->win, commit->graph[i]);
2738
2739 col += commit->graph_size + 1;
2740 }
2741
2742 wmove(view->win, lineno, col);
2743
2744 if (commit->refs) {
2745 size_t i = 0;
2746
2747 do {
2748 if (type == LINE_CURSOR)
2749 ;
2750 else if (commit->refs[i]->tag)
2751 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2752 else
2753 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2754 waddstr(view->win, "[");
2755 waddstr(view->win, commit->refs[i]->name);
2756 waddstr(view->win, "]");
2757 if (type != LINE_CURSOR)
2758 wattrset(view->win, A_NORMAL);
2759 waddstr(view->win, " ");
2760 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2761 } while (commit->refs[i++]->next);
2762 }
2763
2764 if (type != LINE_CURSOR)
2765 wattrset(view->win, get_line_attr(type));
2766
2767 {
2768 int titlelen = strlen(commit->title);
2769
2770 if (col + titlelen > view->width)
2771 titlelen = view->width - col;
2772
2773 waddnstr(view->win, commit->title, titlelen);
2774 }
2775
2776 return TRUE;
2777 }
2778
2779 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2780 static bool
2781 main_read(struct view *view, char *line)
2782 {
2783 enum line_type type = get_line_type(line);
2784 struct commit *commit = view->lines
2785 ? view->line[view->lines - 1].data : NULL;
2786
2787 switch (type) {
2788 case LINE_COMMIT:
2789 commit = calloc(1, sizeof(struct commit));
2790 if (!commit)
2791 return FALSE;
2792
2793 line += STRING_SIZE("commit ");
2794
2795 view->line[view->lines++].data = commit;
2796 string_copy(commit->id, line);
2797 commit->refs = get_refs(commit->id);
2798 commit->graph[commit->graph_size++] = ACS_LTEE;
2799 break;
2800
2801 case LINE_AUTHOR:
2802 {
2803 char *ident = line + STRING_SIZE("author ");
2804 char *end = strchr(ident, '<');
2805
2806 if (!commit)
2807 break;
2808
2809 if (end) {
2810 char *email = end + 1;
2811
2812 for (; end > ident && isspace(end[-1]); end--) ;
2813
2814 if (end == ident && *email) {
2815 ident = email;
2816 end = strchr(ident, '>');
2817 for (; end > ident && isspace(end[-1]); end--) ;
2818 }
2819 *end = 0;
2820 }
2821
2822 /* End is NULL or ident meaning there's no author. */
2823 if (end <= ident)
2824 ident = "Unknown";
2825
2826 string_copy(commit->author, ident);
2827
2828 /* Parse epoch and timezone */
2829 if (end) {
2830 char *secs = strchr(end + 1, '>');
2831 char *zone;
2832 time_t time;
2833
2834 if (!secs || secs[1] != ' ')
2835 break;
2836
2837 secs += 2;
2838 time = (time_t) atol(secs);
2839 zone = strchr(secs, ' ');
2840 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2841 long tz;
2842
2843 zone++;
2844 tz = ('0' - zone[1]) * 60 * 60 * 10;
2845 tz += ('0' - zone[2]) * 60 * 60;
2846 tz += ('0' - zone[3]) * 60;
2847 tz += ('0' - zone[4]) * 60;
2848
2849 if (zone[0] == '-')
2850 tz = -tz;
2851
2852 time -= tz;
2853 }
2854 gmtime_r(&time, &commit->time);
2855 }
2856 break;
2857 }
2858 default:
2859 if (!commit)
2860 break;
2861
2862 /* Fill in the commit title if it has not already been set. */
2863 if (commit->title[0])
2864 break;
2865
2866 /* Require titles to start with a non-space character at the
2867 * offset used by git log. */
2868 /* FIXME: More gracefull handling of titles; append "..." to
2869 * shortened titles, etc. */
2870 if (strncmp(line, " ", 4) ||
2871 isspace(line[4]))
2872 break;
2873
2874 string_copy(commit->title, line + 4);
2875 }
2876
2877 return TRUE;
2878 }
2879
2880 static bool
2881 main_enter(struct view *view, struct line *line)
2882 {
2883 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2884
2885 open_view(view, REQ_VIEW_DIFF, flags);
2886 return TRUE;
2887 }
2888
2889 static bool
2890 main_grep(struct view *view, struct line *line)
2891 {
2892 struct commit *commit = line->data;
2893 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
2894 char buf[DATE_COLS + 1];
2895 regmatch_t pmatch;
2896
2897 for (state = S_TITLE; state < S_END; state++) {
2898 char *text;
2899
2900 switch (state) {
2901 case S_TITLE: text = commit->title; break;
2902 case S_AUTHOR: text = commit->author; break;
2903 case S_DATE:
2904 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
2905 continue;
2906 text = buf;
2907 break;
2908
2909 default:
2910 return FALSE;
2911 }
2912
2913 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
2914 return TRUE;
2915 }
2916
2917 return FALSE;
2918 }
2919
2920 static void
2921 main_select(struct view *view, struct line *line)
2922 {
2923 struct commit *commit = line->data;
2924
2925 string_copy(view->ref, commit->id);
2926 string_copy(ref_commit, view->ref);
2927 }
2928
2929 static struct view_ops main_ops = {
2930 "commit",
2931 main_draw,
2932 main_read,
2933 main_enter,
2934 main_grep,
2935 main_select,
2936 };
2937
2938
2939 /*
2940 * Unicode / UTF-8 handling
2941 *
2942 * NOTE: Much of the following code for dealing with unicode is derived from
2943 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2944 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2945 */
2946
2947 /* I've (over)annotated a lot of code snippets because I am not entirely
2948 * confident that the approach taken by this small UTF-8 interface is correct.
2949 * --jonas */
2950
2951 static inline int
2952 unicode_width(unsigned long c)
2953 {
2954 if (c >= 0x1100 &&
2955 (c <= 0x115f /* Hangul Jamo */
2956 || c == 0x2329
2957 || c == 0x232a
2958 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2959 /* CJK ... Yi */
2960 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2961 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2962 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2963 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2964 || (c >= 0xffe0 && c <= 0xffe6)
2965 || (c >= 0x20000 && c <= 0x2fffd)
2966 || (c >= 0x30000 && c <= 0x3fffd)))
2967 return 2;
2968
2969 return 1;
2970 }
2971
2972 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2973 * Illegal bytes are set one. */
2974 static const unsigned char utf8_bytes[256] = {
2975 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2976 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2977 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2978 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,
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 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,
2982 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,
2983 };
2984
2985 /* Decode UTF-8 multi-byte representation into a unicode character. */
2986 static inline unsigned long
2987 utf8_to_unicode(const char *string, size_t length)
2988 {
2989 unsigned long unicode;
2990
2991 switch (length) {
2992 case 1:
2993 unicode = string[0];
2994 break;
2995 case 2:
2996 unicode = (string[0] & 0x1f) << 6;
2997 unicode += (string[1] & 0x3f);
2998 break;
2999 case 3:
3000 unicode = (string[0] & 0x0f) << 12;
3001 unicode += ((string[1] & 0x3f) << 6);
3002 unicode += (string[2] & 0x3f);
3003 break;
3004 case 4:
3005 unicode = (string[0] & 0x0f) << 18;
3006 unicode += ((string[1] & 0x3f) << 12);
3007 unicode += ((string[2] & 0x3f) << 6);
3008 unicode += (string[3] & 0x3f);
3009 break;
3010 case 5:
3011 unicode = (string[0] & 0x0f) << 24;
3012 unicode += ((string[1] & 0x3f) << 18);
3013 unicode += ((string[2] & 0x3f) << 12);
3014 unicode += ((string[3] & 0x3f) << 6);
3015 unicode += (string[4] & 0x3f);
3016 break;
3017 case 6:
3018 unicode = (string[0] & 0x01) << 30;
3019 unicode += ((string[1] & 0x3f) << 24);
3020 unicode += ((string[2] & 0x3f) << 18);
3021 unicode += ((string[3] & 0x3f) << 12);
3022 unicode += ((string[4] & 0x3f) << 6);
3023 unicode += (string[5] & 0x3f);
3024 break;
3025 default:
3026 die("Invalid unicode length");
3027 }
3028
3029 /* Invalid characters could return the special 0xfffd value but NUL
3030 * should be just as good. */
3031 return unicode > 0xffff ? 0 : unicode;
3032 }
3033
3034 /* Calculates how much of string can be shown within the given maximum width
3035 * and sets trimmed parameter to non-zero value if all of string could not be
3036 * shown.
3037 *
3038 * Additionally, adds to coloffset how many many columns to move to align with
3039 * the expected position. Takes into account how multi-byte and double-width
3040 * characters will effect the cursor position.
3041 *
3042 * Returns the number of bytes to output from string to satisfy max_width. */
3043 static size_t
3044 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3045 {
3046 const char *start = string;
3047 const char *end = strchr(string, '\0');
3048 size_t mbwidth = 0;
3049 size_t width = 0;
3050
3051 *trimmed = 0;
3052
3053 while (string < end) {
3054 int c = *(unsigned char *) string;
3055 unsigned char bytes = utf8_bytes[c];
3056 size_t ucwidth;
3057 unsigned long unicode;
3058
3059 if (string + bytes > end)
3060 break;
3061
3062 /* Change representation to figure out whether
3063 * it is a single- or double-width character. */
3064
3065 unicode = utf8_to_unicode(string, bytes);
3066 /* FIXME: Graceful handling of invalid unicode character. */
3067 if (!unicode)
3068 break;
3069
3070 ucwidth = unicode_width(unicode);
3071 width += ucwidth;
3072 if (width > max_width) {
3073 *trimmed = 1;
3074 break;
3075 }
3076
3077 /* The column offset collects the differences between the
3078 * number of bytes encoding a character and the number of
3079 * columns will be used for rendering said character.
3080 *
3081 * So if some character A is encoded in 2 bytes, but will be
3082 * represented on the screen using only 1 byte this will and up
3083 * adding 1 to the multi-byte column offset.
3084 *
3085 * Assumes that no double-width character can be encoding in
3086 * less than two bytes. */
3087 if (bytes > ucwidth)
3088 mbwidth += bytes - ucwidth;
3089
3090 string += bytes;
3091 }
3092
3093 *coloffset += mbwidth;
3094
3095 return string - start;
3096 }
3097
3098
3099 /*
3100 * Status management
3101 */
3102
3103 /* Whether or not the curses interface has been initialized. */
3104 static bool cursed = FALSE;
3105
3106 /* The status window is used for polling keystrokes. */
3107 static WINDOW *status_win;
3108
3109 /* Update status and title window. */
3110 static void
3111 report(const char *msg, ...)
3112 {
3113 static bool empty = TRUE;
3114 struct view *view = display[current_view];
3115
3116 if (!empty || *msg) {
3117 va_list args;
3118
3119 va_start(args, msg);
3120
3121 werase(status_win);
3122 wmove(status_win, 0, 0);
3123 if (*msg) {
3124 vwprintw(status_win, msg, args);
3125 empty = FALSE;
3126 } else {
3127 empty = TRUE;
3128 }
3129 wrefresh(status_win);
3130
3131 va_end(args);
3132 }
3133
3134 update_view_title(view);
3135 update_display_cursor();
3136 }
3137
3138 /* Controls when nodelay should be in effect when polling user input. */
3139 static void
3140 set_nonblocking_input(bool loading)
3141 {
3142 static unsigned int loading_views;
3143
3144 if ((loading == FALSE && loading_views-- == 1) ||
3145 (loading == TRUE && loading_views++ == 0))
3146 nodelay(status_win, loading);
3147 }
3148
3149 static void
3150 init_display(void)
3151 {
3152 int x, y;
3153
3154 /* Initialize the curses library */
3155 if (isatty(STDIN_FILENO)) {
3156 cursed = !!initscr();
3157 } else {
3158 /* Leave stdin and stdout alone when acting as a pager. */
3159 FILE *io = fopen("/dev/tty", "r+");
3160
3161 if (!io)
3162 die("Failed to open /dev/tty");
3163 cursed = !!newterm(NULL, io, io);
3164 }
3165
3166 if (!cursed)
3167 die("Failed to initialize curses");
3168
3169 nonl(); /* Tell curses not to do NL->CR/NL on output */
3170 cbreak(); /* Take input chars one at a time, no wait for \n */
3171 noecho(); /* Don't echo input */
3172 leaveok(stdscr, TRUE);
3173
3174 if (has_colors())
3175 init_colors();
3176
3177 getmaxyx(stdscr, y, x);
3178 status_win = newwin(1, 0, y - 1, 0);
3179 if (!status_win)
3180 die("Failed to create status window");
3181
3182 /* Enable keyboard mapping */
3183 keypad(status_win, TRUE);
3184 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3185 }
3186
3187 static char *
3188 read_prompt(const char *prompt)
3189 {
3190 enum { READING, STOP, CANCEL } status = READING;
3191 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3192 int pos = 0;
3193
3194 while (status == READING) {
3195 struct view *view;
3196 int i, key;
3197
3198 foreach_view (view, i)
3199 update_view(view);
3200
3201 report("%s%.*s", prompt, pos, buf);
3202 /* Refresh, accept single keystroke of input */
3203 key = wgetch(status_win);
3204 switch (key) {
3205 case KEY_RETURN:
3206 case KEY_ENTER:
3207 case '\n':
3208 status = pos ? STOP : CANCEL;
3209 break;
3210
3211 case KEY_BACKSPACE:
3212 if (pos > 0)
3213 pos--;
3214 else
3215 status = CANCEL;
3216 break;
3217
3218 case KEY_ESC:
3219 status = CANCEL;
3220 break;
3221
3222 case ERR:
3223 break;
3224
3225 default:
3226 if (pos >= sizeof(buf)) {
3227 report("Input string too long");
3228 return NULL;
3229 }
3230
3231 if (isprint(key))
3232 buf[pos++] = (char) key;
3233 }
3234 }
3235
3236 if (status == CANCEL) {
3237 /* Clear the status window */
3238 report("");
3239 return NULL;
3240 }
3241
3242 buf[pos++] = 0;
3243
3244 return buf;
3245 }
3246
3247 /*
3248 * Repository references
3249 */
3250
3251 static struct ref *refs;
3252 static size_t refs_size;
3253
3254 /* Id <-> ref store */
3255 static struct ref ***id_refs;
3256 static size_t id_refs_size;
3257
3258 static struct ref **
3259 get_refs(char *id)
3260 {
3261 struct ref ***tmp_id_refs;
3262 struct ref **ref_list = NULL;
3263 size_t ref_list_size = 0;
3264 size_t i;
3265
3266 for (i = 0; i < id_refs_size; i++)
3267 if (!strcmp(id, id_refs[i][0]->id))
3268 return id_refs[i];
3269
3270 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3271 if (!tmp_id_refs)
3272 return NULL;
3273
3274 id_refs = tmp_id_refs;
3275
3276 for (i = 0; i < refs_size; i++) {
3277 struct ref **tmp;
3278
3279 if (strcmp(id, refs[i].id))
3280 continue;
3281
3282 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3283 if (!tmp) {
3284 if (ref_list)
3285 free(ref_list);
3286 return NULL;
3287 }
3288
3289 ref_list = tmp;
3290 if (ref_list_size > 0)
3291 ref_list[ref_list_size - 1]->next = 1;
3292 ref_list[ref_list_size] = &refs[i];
3293
3294 /* XXX: The properties of the commit chains ensures that we can
3295 * safely modify the shared ref. The repo references will
3296 * always be similar for the same id. */
3297 ref_list[ref_list_size]->next = 0;
3298 ref_list_size++;
3299 }
3300
3301 if (ref_list)
3302 id_refs[id_refs_size++] = ref_list;
3303
3304 return ref_list;
3305 }
3306
3307 static int
3308 read_ref(char *id, int idlen, char *name, int namelen)
3309 {
3310 struct ref *ref;
3311 bool tag = FALSE;
3312
3313 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3314 /* Commits referenced by tags has "^{}" appended. */
3315 if (name[namelen - 1] != '}')
3316 return OK;
3317
3318 while (namelen > 0 && name[namelen] != '^')
3319 namelen--;
3320
3321 tag = TRUE;
3322 namelen -= STRING_SIZE("refs/tags/");
3323 name += STRING_SIZE("refs/tags/");
3324
3325 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3326 namelen -= STRING_SIZE("refs/heads/");
3327 name += STRING_SIZE("refs/heads/");
3328
3329 } else if (!strcmp(name, "HEAD")) {
3330 return OK;
3331 }
3332
3333 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3334 if (!refs)
3335 return ERR;
3336
3337 ref = &refs[refs_size++];
3338 ref->name = malloc(namelen + 1);
3339 if (!ref->name)
3340 return ERR;
3341
3342 strncpy(ref->name, name, namelen);
3343 ref->name[namelen] = 0;
3344 ref->tag = tag;
3345 string_copy(ref->id, id);
3346
3347 return OK;
3348 }
3349
3350 static int
3351 load_refs(void)
3352 {
3353 const char *cmd_env = getenv("TIG_LS_REMOTE");
3354 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3355
3356 return read_properties(popen(cmd, "r"), "\t", read_ref);
3357 }
3358
3359 static int
3360 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3361 {
3362 if (!strcmp(name, "i18n.commitencoding"))
3363 string_copy(opt_encoding, value);
3364
3365 return OK;
3366 }
3367
3368 static int
3369 load_repo_config(void)
3370 {
3371 return read_properties(popen("git repo-config --list", "r"),
3372 "=", read_repo_config_option);
3373 }
3374
3375 static int
3376 read_properties(FILE *pipe, const char *separators,
3377 int (*read_property)(char *, int, char *, int))
3378 {
3379 char buffer[BUFSIZ];
3380 char *name;
3381 int state = OK;
3382
3383 if (!pipe)
3384 return ERR;
3385
3386 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3387 char *value;
3388 size_t namelen;
3389 size_t valuelen;
3390
3391 name = chomp_string(name);
3392 namelen = strcspn(name, separators);
3393
3394 if (name[namelen]) {
3395 name[namelen] = 0;
3396 value = chomp_string(name + namelen + 1);
3397 valuelen = strlen(value);
3398
3399 } else {
3400 value = "";
3401 valuelen = 0;
3402 }
3403
3404 state = read_property(name, namelen, value, valuelen);
3405 }
3406
3407 if (state != ERR && ferror(pipe))
3408 state = ERR;
3409
3410 pclose(pipe);
3411
3412 return state;
3413 }
3414
3415
3416 /*
3417 * Main
3418 */
3419
3420 static void __NORETURN
3421 quit(int sig)
3422 {
3423 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3424 if (cursed)
3425 endwin();
3426 exit(0);
3427 }
3428
3429 static void __NORETURN
3430 die(const char *err, ...)
3431 {
3432 va_list args;
3433
3434 endwin();
3435
3436 va_start(args, err);
3437 fputs("tig: ", stderr);
3438 vfprintf(stderr, err, args);
3439 fputs("\n", stderr);
3440 va_end(args);
3441
3442 exit(1);
3443 }
3444
3445 int
3446 main(int argc, char *argv[])
3447 {
3448 struct view *view;
3449 enum request request;
3450 size_t i;
3451
3452 signal(SIGINT, quit);
3453
3454 if (setlocale(LC_ALL, "")) {
3455 string_copy(opt_codeset, nl_langinfo(CODESET));
3456 }
3457
3458 if (load_options() == ERR)
3459 die("Failed to load user config.");
3460
3461 /* Load the repo config file so options can be overwritten from
3462 * the command line. */
3463 if (load_repo_config() == ERR)
3464 die("Failed to load repo config.");
3465
3466 if (!parse_options(argc, argv))
3467 return 0;
3468
3469 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3470 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3471 if (opt_iconv == ICONV_NONE)
3472 die("Failed to initialize character set conversion");
3473 }
3474
3475 if (load_refs() == ERR)
3476 die("Failed to load refs.");
3477
3478 /* Require a git repository unless when running in pager mode. */
3479 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3480 die("Not a git repository");
3481
3482 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3483 view->cmd_env = getenv(view->cmd_env);
3484
3485 request = opt_request;
3486
3487 init_display();
3488
3489 while (view_driver(display[current_view], request)) {
3490 int key;
3491 int i;
3492
3493 foreach_view (view, i)
3494 update_view(view);
3495
3496 /* Refresh, accept single keystroke of input */
3497 key = wgetch(status_win);
3498
3499 request = get_keybinding(display[current_view]->keymap, key);
3500
3501 /* Some low-level request handling. This keeps access to
3502 * status_win restricted. */
3503 switch (request) {
3504 case REQ_PROMPT:
3505 {
3506 char *cmd = read_prompt(":");
3507
3508 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3509 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3510 opt_request = REQ_VIEW_DIFF;
3511 } else {
3512 opt_request = REQ_VIEW_PAGER;
3513 }
3514 break;
3515 }
3516
3517 request = REQ_NONE;
3518 break;
3519 }
3520 case REQ_SEARCH:
3521 case REQ_SEARCH_BACK:
3522 {
3523 const char *prompt = request == REQ_SEARCH
3524 ? "/" : "?";
3525 char *search = read_prompt(prompt);
3526
3527 if (search)
3528 string_copy(opt_search, search);
3529 else
3530 request = REQ_NONE;
3531 break;
3532 }
3533 case REQ_SCREEN_RESIZE:
3534 {
3535 int height, width;
3536
3537 getmaxyx(stdscr, height, width);
3538
3539 /* Resize the status view and let the view driver take
3540 * care of resizing the displayed views. */
3541 wresize(status_win, 1, width);
3542 mvwin(status_win, height - 1, 0);
3543 wrefresh(status_win);
3544 break;
3545 }
3546 default:
3547 break;
3548 }
3549 }
3550
3551 quit(0);
3552
3553 return 0;
3554 }
Full-screen terminal Git browser.