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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-0.5.git"
16 #endif
17
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
32
33 #include <sys/types.h>
34 #include <regex.h>
35
36 #include <locale.h>
37 #include <langinfo.h>
38 #include <iconv.h>
39
40 #include <curses.h>
41
42 #if __GNUC__ >= 3
43 #define __NORETURN __attribute__((__noreturn__))
44 #else
45 #define __NORETURN
46 #endif
47
48 static void __NORETURN die(const char *err, ...);
49 static void report(const char *msg, ...);
50 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
51 static void set_nonblocking_input(bool loading);
52 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
53
54 #define ABS(x) ((x) >= 0 ? (x) : -(x))
55 #define MIN(x, y) ((x) < (y) ? (x) : (y))
56
57 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
58 #define STRING_SIZE(x) (sizeof(x) - 1)
59
60 #define SIZEOF_STR 1024 /* Default string size. */
61 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
62 #define SIZEOF_REV 41 /* Holds a SHA-1 and an ending NUL */
63 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
64
65 /* This color name can be used to refer to the default term colors. */
66 #define COLOR_DEFAULT (-1)
67
68 #define ICONV_NONE ((iconv_t) -1)
69
70 /* The format and size of the date column in the main view. */
71 #define DATE_FORMAT "%Y-%m-%d %H:%M"
72 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
73
74 #define AUTHOR_COLS 20
75
76 /* The default interval between line numbers. */
77 #define NUMBER_INTERVAL 1
78
79 #define TABSIZE 8
80
81 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
82
83 #define TIG_LS_REMOTE \
84 "git ls-remote . 2>/dev/null"
85
86 #define TIG_DIFF_CMD \
87 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
88
89 #define TIG_LOG_CMD \
90 "git log --cc --stat -n100 %s 2>/dev/null"
91
92 #define TIG_MAIN_CMD \
93 "git log --topo-order --pretty=raw %s 2>/dev/null"
94
95 #define TIG_TREE_CMD \
96 "git ls-tree %s %s"
97
98 #define TIG_BLOB_CMD \
99 "git cat-file blob %s"
100
101 /* XXX: Needs to be defined to the empty string. */
102 #define TIG_HELP_CMD ""
103 #define TIG_PAGER_CMD ""
104
105 /* Some ascii-shorthands fitted into the ncurses namespace. */
106 #define KEY_TAB '\t'
107 #define KEY_RETURN '\r'
108 #define KEY_ESC 27
109
110
111 struct ref {
112 char *name; /* Ref name; tag or head names are shortened. */
113 char id[SIZEOF_REV]; /* Commit SHA1 ID */
114 unsigned int tag:1; /* Is it a tag? */
115 unsigned int next:1; /* For ref lists: are there more refs? */
116 };
117
118 static struct ref **get_refs(char *id);
119
120 struct int_map {
121 const char *name;
122 int namelen;
123 int value;
124 };
125
126 static int
127 set_from_int_map(struct int_map *map, size_t map_size,
128 int *value, const char *name, int namelen)
129 {
130
131 int i;
132
133 for (i = 0; i < map_size; i++)
134 if (namelen == map[i].namelen &&
135 !strncasecmp(name, map[i].name, namelen)) {
136 *value = map[i].value;
137 return OK;
138 }
139
140 return ERR;
141 }
142
143
144 /*
145 * String helpers
146 */
147
148 static inline void
149 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
150 {
151 if (srclen > dstlen - 1)
152 srclen = dstlen - 1;
153
154 strncpy(dst, src, srclen);
155 dst[srclen] = 0;
156 }
157
158 /* Shorthands for safely copying into a fixed buffer. */
159
160 #define string_copy(dst, src) \
161 string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
162
163 #define string_ncopy(dst, src, srclen) \
164 string_ncopy_do(dst, sizeof(dst), src, srclen)
165
166 static char *
167 chomp_string(char *name)
168 {
169 int namelen;
170
171 while (isspace(*name))
172 name++;
173
174 namelen = strlen(name) - 1;
175 while (namelen > 0 && isspace(name[namelen]))
176 name[namelen--] = 0;
177
178 return name;
179 }
180
181 static bool
182 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
183 {
184 va_list args;
185 size_t pos = bufpos ? *bufpos : 0;
186
187 va_start(args, fmt);
188 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
189 va_end(args);
190
191 if (bufpos)
192 *bufpos = pos;
193
194 return pos >= bufsize ? FALSE : TRUE;
195 }
196
197 #define string_format(buf, fmt, args...) \
198 string_nformat(buf, sizeof(buf), NULL, fmt, args)
199
200 #define string_format_from(buf, from, fmt, args...) \
201 string_nformat(buf, sizeof(buf), from, fmt, args)
202
203 static int
204 string_enum_compare(const char *str1, const char *str2, int len)
205 {
206 size_t i;
207
208 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
209
210 /* Diff-Header == DIFF_HEADER */
211 for (i = 0; i < len; i++) {
212 if (toupper(str1[i]) == toupper(str2[i]))
213 continue;
214
215 if (string_enum_sep(str1[i]) &&
216 string_enum_sep(str2[i]))
217 continue;
218
219 return str1[i] - str2[i];
220 }
221
222 return 0;
223 }
224
225 /* Shell quoting
226 *
227 * NOTE: The following is a slightly modified copy of the git project's shell
228 * quoting routines found in the quote.c file.
229 *
230 * Help to copy the thing properly quoted for the shell safety. any single
231 * quote is replaced with '\'', any exclamation point is replaced with '\!',
232 * and the whole thing is enclosed in a
233 *
234 * E.g.
235 * original sq_quote result
236 * name ==> name ==> 'name'
237 * a b ==> a b ==> 'a b'
238 * a'b ==> a'\''b ==> 'a'\''b'
239 * a!b ==> a'\!'b ==> 'a'\!'b'
240 */
241
242 static size_t
243 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
244 {
245 char c;
246
247 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
248
249 BUFPUT('\'');
250 while ((c = *src++)) {
251 if (c == '\'' || c == '!') {
252 BUFPUT('\'');
253 BUFPUT('\\');
254 BUFPUT(c);
255 BUFPUT('\'');
256 } else {
257 BUFPUT(c);
258 }
259 }
260 BUFPUT('\'');
261
262 return bufsize;
263 }
264
265
266 /*
267 * User requests
268 */
269
270 #define REQ_INFO \
271 /* XXX: Keep the view request first and in sync with views[]. */ \
272 REQ_GROUP("View switching") \
273 REQ_(VIEW_MAIN, "Show main view"), \
274 REQ_(VIEW_DIFF, "Show diff view"), \
275 REQ_(VIEW_LOG, "Show log view"), \
276 REQ_(VIEW_TREE, "Show tree view"), \
277 REQ_(VIEW_BLOB, "Show blob view"), \
278 REQ_(VIEW_HELP, "Show help page"), \
279 REQ_(VIEW_PAGER, "Show pager view"), \
280 \
281 REQ_GROUP("View manipulation") \
282 REQ_(ENTER, "Enter current line and scroll"), \
283 REQ_(NEXT, "Move to next"), \
284 REQ_(PREVIOUS, "Move to previous"), \
285 REQ_(VIEW_NEXT, "Move focus to next view"), \
286 REQ_(VIEW_CLOSE, "Close the current view"), \
287 REQ_(QUIT, "Close all views and quit"), \
288 \
289 REQ_GROUP("Cursor navigation") \
290 REQ_(MOVE_UP, "Move cursor one line up"), \
291 REQ_(MOVE_DOWN, "Move cursor one line down"), \
292 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
293 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
294 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
295 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
296 \
297 REQ_GROUP("Scrolling") \
298 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
299 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
300 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
301 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
302 \
303 REQ_GROUP("Searching") \
304 REQ_(SEARCH, "Search the view"), \
305 REQ_(SEARCH_BACK, "Search backwards in the view"), \
306 REQ_(FIND_NEXT, "Find next search match"), \
307 REQ_(FIND_PREV, "Find previous search match"), \
308 \
309 REQ_GROUP("Misc") \
310 REQ_(NONE, "Do nothing"), \
311 REQ_(PROMPT, "Bring up the prompt"), \
312 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
313 REQ_(SCREEN_RESIZE, "Resize the screen"), \
314 REQ_(SHOW_VERSION, "Show version information"), \
315 REQ_(STOP_LOADING, "Stop all loading views"), \
316 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
317 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
318
319
320 /* User action requests. */
321 enum request {
322 #define REQ_GROUP(help)
323 #define REQ_(req, help) REQ_##req
324
325 /* Offset all requests to avoid conflicts with ncurses getch values. */
326 REQ_OFFSET = KEY_MAX + 1,
327 REQ_INFO,
328 REQ_UNKNOWN,
329
330 #undef REQ_GROUP
331 #undef REQ_
332 };
333
334 struct request_info {
335 enum request request;
336 char *name;
337 int namelen;
338 char *help;
339 };
340
341 static struct request_info req_info[] = {
342 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
343 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
344 REQ_INFO
345 #undef REQ_GROUP
346 #undef REQ_
347 };
348
349 static enum request
350 get_request(const char *name)
351 {
352 int namelen = strlen(name);
353 int i;
354
355 for (i = 0; i < ARRAY_SIZE(req_info); i++)
356 if (req_info[i].namelen == namelen &&
357 !string_enum_compare(req_info[i].name, name, namelen))
358 return req_info[i].request;
359
360 return REQ_UNKNOWN;
361 }
362
363
364 /*
365 * Options
366 */
367
368 static const char usage[] =
369 VERSION " (" __DATE__ ")\n"
370 "\n"
371 "Usage: tig [options]\n"
372 " or: tig [options] [--] [git log options]\n"
373 " or: tig [options] log [git log options]\n"
374 " or: tig [options] diff [git diff options]\n"
375 " or: tig [options] show [git show options]\n"
376 " or: tig [options] < [git command output]\n"
377 "\n"
378 "Options:\n"
379 " -l Start up in log view\n"
380 " -d Start up in diff view\n"
381 " -n[I], --line-number[=I] Show line numbers with given interval\n"
382 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
383 " -- Mark end of tig options\n"
384 " -v, --version Show version and exit\n"
385 " -h, --help Show help message and exit\n";
386
387 /* Option and state variables. */
388 static bool opt_line_number = FALSE;
389 static bool opt_rev_graph = TRUE;
390 static int opt_num_interval = NUMBER_INTERVAL;
391 static int opt_tab_size = TABSIZE;
392 static enum request opt_request = REQ_VIEW_MAIN;
393 static char opt_cmd[SIZEOF_STR] = "";
394 static char opt_path[SIZEOF_STR] = "";
395 static FILE *opt_pipe = NULL;
396 static char opt_encoding[20] = "UTF-8";
397 static bool opt_utf8 = TRUE;
398 static char opt_codeset[20] = "UTF-8";
399 static iconv_t opt_iconv = ICONV_NONE;
400 static char opt_search[SIZEOF_STR] = "";
401
402 enum option_type {
403 OPT_NONE,
404 OPT_INT,
405 };
406
407 static bool
408 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
409 {
410 va_list args;
411 char *value = "";
412 int *number;
413
414 if (opt[0] != '-')
415 return FALSE;
416
417 if (opt[1] == '-') {
418 int namelen = strlen(name);
419
420 opt += 2;
421
422 if (strncmp(opt, name, namelen))
423 return FALSE;
424
425 if (opt[namelen] == '=')
426 value = opt + namelen + 1;
427
428 } else {
429 if (!short_name || opt[1] != short_name)
430 return FALSE;
431 value = opt + 2;
432 }
433
434 va_start(args, type);
435 if (type == OPT_INT) {
436 number = va_arg(args, int *);
437 if (isdigit(*value))
438 *number = atoi(value);
439 }
440 va_end(args);
441
442 return TRUE;
443 }
444
445 /* Returns the index of log or diff command or -1 to exit. */
446 static bool
447 parse_options(int argc, char *argv[])
448 {
449 int i;
450
451 for (i = 1; i < argc; i++) {
452 char *opt = argv[i];
453
454 if (!strcmp(opt, "log") ||
455 !strcmp(opt, "diff") ||
456 !strcmp(opt, "show")) {
457 opt_request = opt[0] == 'l'
458 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
459 break;
460 }
461
462 if (opt[0] && opt[0] != '-')
463 break;
464
465 if (!strcmp(opt, "-l")) {
466 opt_request = REQ_VIEW_LOG;
467 continue;
468 }
469
470 if (!strcmp(opt, "-d")) {
471 opt_request = REQ_VIEW_DIFF;
472 continue;
473 }
474
475 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
476 opt_line_number = TRUE;
477 continue;
478 }
479
480 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
481 opt_tab_size = MIN(opt_tab_size, TABSIZE);
482 continue;
483 }
484
485 if (check_option(opt, 'v', "version", OPT_NONE)) {
486 printf("tig version %s\n", VERSION);
487 return FALSE;
488 }
489
490 if (check_option(opt, 'h', "help", OPT_NONE)) {
491 printf(usage);
492 return FALSE;
493 }
494
495 if (!strcmp(opt, "--")) {
496 i++;
497 break;
498 }
499
500 die("unknown option '%s'\n\n%s", opt, usage);
501 }
502
503 if (!isatty(STDIN_FILENO)) {
504 opt_request = REQ_VIEW_PAGER;
505 opt_pipe = stdin;
506
507 } else if (i < argc) {
508 size_t buf_size;
509
510 if (opt_request == REQ_VIEW_MAIN)
511 /* XXX: This is vulnerable to the user overriding
512 * options required for the main view parser. */
513 string_copy(opt_cmd, "git log --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 /* Using the ncurses SIGWINCH handler. */
734 { KEY_RESIZE, REQ_SCREEN_RESIZE },
735 };
736
737 #define KEYMAP_INFO \
738 KEYMAP_(GENERIC), \
739 KEYMAP_(MAIN), \
740 KEYMAP_(DIFF), \
741 KEYMAP_(LOG), \
742 KEYMAP_(TREE), \
743 KEYMAP_(BLOB), \
744 KEYMAP_(PAGER), \
745 KEYMAP_(HELP) \
746
747 enum keymap {
748 #define KEYMAP_(name) KEYMAP_##name
749 KEYMAP_INFO
750 #undef KEYMAP_
751 };
752
753 static struct int_map keymap_table[] = {
754 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
755 KEYMAP_INFO
756 #undef KEYMAP_
757 };
758
759 #define set_keymap(map, name) \
760 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
761
762 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
763
764 static void
765 add_keybinding(enum keymap keymap, enum request request, int key)
766 {
767 struct keybinding *keybinding;
768
769 keybinding = calloc(1, sizeof(*keybinding));
770 if (!keybinding)
771 die("Failed to allocate keybinding");
772
773 keybinding->alias = key;
774 keybinding->request = request;
775 keybinding->next = keybindings[keymap];
776 keybindings[keymap] = keybinding;
777 }
778
779 /* Looks for a key binding first in the given map, then in the generic map, and
780 * lastly in the default keybindings. */
781 static enum request
782 get_keybinding(enum keymap keymap, int key)
783 {
784 struct keybinding *kbd;
785 int i;
786
787 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
788 if (kbd->alias == key)
789 return kbd->request;
790
791 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
792 if (kbd->alias == key)
793 return kbd->request;
794
795 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
796 if (default_keybindings[i].alias == key)
797 return default_keybindings[i].request;
798
799 return (enum request) key;
800 }
801
802
803 struct key {
804 char *name;
805 int value;
806 };
807
808 static struct key key_table[] = {
809 { "Enter", KEY_RETURN },
810 { "Space", ' ' },
811 { "Backspace", KEY_BACKSPACE },
812 { "Tab", KEY_TAB },
813 { "Escape", KEY_ESC },
814 { "Left", KEY_LEFT },
815 { "Right", KEY_RIGHT },
816 { "Up", KEY_UP },
817 { "Down", KEY_DOWN },
818 { "Insert", KEY_IC },
819 { "Delete", KEY_DC },
820 { "Hash", '#' },
821 { "Home", KEY_HOME },
822 { "End", KEY_END },
823 { "PageUp", KEY_PPAGE },
824 { "PageDown", KEY_NPAGE },
825 { "F1", KEY_F(1) },
826 { "F2", KEY_F(2) },
827 { "F3", KEY_F(3) },
828 { "F4", KEY_F(4) },
829 { "F5", KEY_F(5) },
830 { "F6", KEY_F(6) },
831 { "F7", KEY_F(7) },
832 { "F8", KEY_F(8) },
833 { "F9", KEY_F(9) },
834 { "F10", KEY_F(10) },
835 { "F11", KEY_F(11) },
836 { "F12", KEY_F(12) },
837 };
838
839 static int
840 get_key_value(const char *name)
841 {
842 int i;
843
844 for (i = 0; i < ARRAY_SIZE(key_table); i++)
845 if (!strcasecmp(key_table[i].name, name))
846 return key_table[i].value;
847
848 if (strlen(name) == 1 && isprint(*name))
849 return (int) *name;
850
851 return ERR;
852 }
853
854 static char *
855 get_key(enum request request)
856 {
857 static char buf[BUFSIZ];
858 static char key_char[] = "'X'";
859 size_t pos = 0;
860 char *sep = " ";
861 int i;
862
863 buf[pos] = 0;
864
865 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
866 struct keybinding *keybinding = &default_keybindings[i];
867 char *seq = NULL;
868 int key;
869
870 if (keybinding->request != request)
871 continue;
872
873 for (key = 0; key < ARRAY_SIZE(key_table); key++)
874 if (key_table[key].value == keybinding->alias)
875 seq = key_table[key].name;
876
877 if (seq == NULL &&
878 keybinding->alias < 127 &&
879 isprint(keybinding->alias)) {
880 key_char[1] = (char) keybinding->alias;
881 seq = key_char;
882 }
883
884 if (!seq)
885 seq = "'?'";
886
887 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
888 return "Too many keybindings!";
889 sep = ", ";
890 }
891
892 return buf;
893 }
894
895
896 /*
897 * User config file handling.
898 */
899
900 static struct int_map color_map[] = {
901 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
902 COLOR_MAP(DEFAULT),
903 COLOR_MAP(BLACK),
904 COLOR_MAP(BLUE),
905 COLOR_MAP(CYAN),
906 COLOR_MAP(GREEN),
907 COLOR_MAP(MAGENTA),
908 COLOR_MAP(RED),
909 COLOR_MAP(WHITE),
910 COLOR_MAP(YELLOW),
911 };
912
913 #define set_color(color, name) \
914 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
915
916 static struct int_map attr_map[] = {
917 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
918 ATTR_MAP(NORMAL),
919 ATTR_MAP(BLINK),
920 ATTR_MAP(BOLD),
921 ATTR_MAP(DIM),
922 ATTR_MAP(REVERSE),
923 ATTR_MAP(STANDOUT),
924 ATTR_MAP(UNDERLINE),
925 };
926
927 #define set_attribute(attr, name) \
928 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
929
930 static int config_lineno;
931 static bool config_errors;
932 static char *config_msg;
933
934 /* Wants: object fgcolor bgcolor [attr] */
935 static int
936 option_color_command(int argc, char *argv[])
937 {
938 struct line_info *info;
939
940 if (argc != 3 && argc != 4) {
941 config_msg = "Wrong number of arguments given to color command";
942 return ERR;
943 }
944
945 info = get_line_info(argv[0], strlen(argv[0]));
946 if (!info) {
947 config_msg = "Unknown color name";
948 return ERR;
949 }
950
951 if (set_color(&info->fg, argv[1]) == ERR ||
952 set_color(&info->bg, argv[2]) == ERR) {
953 config_msg = "Unknown color";
954 return ERR;
955 }
956
957 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
958 config_msg = "Unknown attribute";
959 return ERR;
960 }
961
962 return OK;
963 }
964
965 /* Wants: name = value */
966 static int
967 option_set_command(int argc, char *argv[])
968 {
969 if (argc != 3) {
970 config_msg = "Wrong number of arguments given to set command";
971 return ERR;
972 }
973
974 if (strcmp(argv[1], "=")) {
975 config_msg = "No value assigned";
976 return ERR;
977 }
978
979 if (!strcmp(argv[0], "show-rev-graph")) {
980 opt_rev_graph = (!strcmp(argv[2], "1") ||
981 !strcmp(argv[2], "true") ||
982 !strcmp(argv[2], "yes"));
983 return OK;
984 }
985
986 if (!strcmp(argv[0], "line-number-interval")) {
987 opt_num_interval = atoi(argv[2]);
988 return OK;
989 }
990
991 if (!strcmp(argv[0], "tab-size")) {
992 opt_tab_size = atoi(argv[2]);
993 return OK;
994 }
995
996 if (!strcmp(argv[0], "commit-encoding")) {
997 char *arg = argv[2];
998 int delimiter = *arg;
999 int i;
1000
1001 switch (delimiter) {
1002 case '"':
1003 case '\'':
1004 for (arg++, i = 0; arg[i]; i++)
1005 if (arg[i] == delimiter) {
1006 arg[i] = 0;
1007 break;
1008 }
1009 default:
1010 string_copy(opt_encoding, arg);
1011 return OK;
1012 }
1013 }
1014
1015 config_msg = "Unknown variable name";
1016 return ERR;
1017 }
1018
1019 /* Wants: mode request key */
1020 static int
1021 option_bind_command(int argc, char *argv[])
1022 {
1023 enum request request;
1024 int keymap;
1025 int key;
1026
1027 if (argc != 3) {
1028 config_msg = "Wrong number of arguments given to bind command";
1029 return ERR;
1030 }
1031
1032 if (set_keymap(&keymap, argv[0]) == ERR) {
1033 config_msg = "Unknown key map";
1034 return ERR;
1035 }
1036
1037 key = get_key_value(argv[1]);
1038 if (key == ERR) {
1039 config_msg = "Unknown key";
1040 return ERR;
1041 }
1042
1043 request = get_request(argv[2]);
1044 if (request == REQ_UNKNOWN) {
1045 config_msg = "Unknown request name";
1046 return ERR;
1047 }
1048
1049 add_keybinding(keymap, request, key);
1050
1051 return OK;
1052 }
1053
1054 static int
1055 set_option(char *opt, char *value)
1056 {
1057 char *argv[16];
1058 int valuelen;
1059 int argc = 0;
1060
1061 /* Tokenize */
1062 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1063 argv[argc++] = value;
1064
1065 value += valuelen;
1066 if (!*value)
1067 break;
1068
1069 *value++ = 0;
1070 while (isspace(*value))
1071 value++;
1072 }
1073
1074 if (!strcmp(opt, "color"))
1075 return option_color_command(argc, argv);
1076
1077 if (!strcmp(opt, "set"))
1078 return option_set_command(argc, argv);
1079
1080 if (!strcmp(opt, "bind"))
1081 return option_bind_command(argc, argv);
1082
1083 config_msg = "Unknown option command";
1084 return ERR;
1085 }
1086
1087 static int
1088 read_option(char *opt, int optlen, char *value, int valuelen)
1089 {
1090 int status = OK;
1091
1092 config_lineno++;
1093 config_msg = "Internal error";
1094
1095 /* Check for comment markers, since read_properties() will
1096 * only ensure opt and value are split at first " \t". */
1097 optlen = strcspn(opt, "#");
1098 if (optlen == 0)
1099 return OK;
1100
1101 if (opt[optlen] != 0) {
1102 config_msg = "No option value";
1103 status = ERR;
1104
1105 } else {
1106 /* Look for comment endings in the value. */
1107 int len = strcspn(value, "#");
1108
1109 if (len < valuelen) {
1110 valuelen = len;
1111 value[valuelen] = 0;
1112 }
1113
1114 status = set_option(opt, value);
1115 }
1116
1117 if (status == ERR) {
1118 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1119 config_lineno, optlen, opt, config_msg);
1120 config_errors = TRUE;
1121 }
1122
1123 /* Always keep going if errors are encountered. */
1124 return OK;
1125 }
1126
1127 static int
1128 load_options(void)
1129 {
1130 char *home = getenv("HOME");
1131 char buf[SIZEOF_STR];
1132 FILE *file;
1133
1134 config_lineno = 0;
1135 config_errors = FALSE;
1136
1137 if (!home || !string_format(buf, "%s/.tigrc", home))
1138 return ERR;
1139
1140 /* It's ok that the file doesn't exist. */
1141 file = fopen(buf, "r");
1142 if (!file)
1143 return OK;
1144
1145 if (read_properties(file, " \t", read_option) == ERR ||
1146 config_errors == TRUE)
1147 fprintf(stderr, "Errors while loading %s.\n", buf);
1148
1149 return OK;
1150 }
1151
1152
1153 /*
1154 * The viewer
1155 */
1156
1157 struct view;
1158 struct view_ops;
1159
1160 /* The display array of active views and the index of the current view. */
1161 static struct view *display[2];
1162 static unsigned int current_view;
1163
1164 /* Reading from the prompt? */
1165 static bool input_mode = FALSE;
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 if (input_mode)
1305 wnoutrefresh(view->win);
1306 else
1307 wrefresh(view->win);
1308 }
1309
1310 static void
1311 redraw_view(struct view *view)
1312 {
1313 wclear(view->win);
1314 redraw_view_from(view, 0);
1315 }
1316
1317
1318 static void
1319 update_view_title(struct view *view)
1320 {
1321 char buf[SIZEOF_STR];
1322 char state[SIZEOF_STR];
1323 size_t bufpos = 0, statelen = 0;
1324
1325 assert(view_is_displayed(view));
1326
1327 if (view->lines || view->pipe) {
1328 unsigned int view_lines = view->offset + view->height;
1329 unsigned int lines = view->lines
1330 ? MIN(view_lines, view->lines) * 100 / view->lines
1331 : 0;
1332
1333 string_format_from(state, &statelen, "- %s %d of %d (%d%%)",
1334 view->ops->type,
1335 view->lineno + 1,
1336 view->lines,
1337 lines);
1338
1339 if (view->pipe) {
1340 time_t secs = time(NULL) - view->start_time;
1341
1342 /* Three git seconds are a long time ... */
1343 if (secs > 2)
1344 string_format_from(state, &statelen, " %lds", secs);
1345 }
1346 }
1347
1348 string_format_from(buf, &bufpos, "[%s]", view->name);
1349 if (*view->ref && bufpos < view->width) {
1350 size_t refsize = strlen(view->ref);
1351 size_t minsize = bufpos + 1 + /* abbrev= */ 7 + 1 + statelen;
1352
1353 if (minsize < view->width)
1354 refsize = view->width - minsize + 7;
1355 string_format_from(buf, &bufpos, " %.*s", refsize, view->ref);
1356 }
1357
1358 if (statelen && bufpos < view->width) {
1359 string_format_from(buf, &bufpos, " %s", state);
1360 }
1361
1362 if (view == display[current_view])
1363 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1364 else
1365 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1366
1367 mvwaddnstr(view->title, 0, 0, buf, bufpos);
1368 wclrtoeol(view->title);
1369 wmove(view->title, 0, view->width - 1);
1370
1371 if (input_mode)
1372 wnoutrefresh(view->title);
1373 else
1374 wrefresh(view->title);
1375 }
1376
1377 static void
1378 resize_display(void)
1379 {
1380 int offset, i;
1381 struct view *base = display[0];
1382 struct view *view = display[1] ? display[1] : display[0];
1383
1384 /* Setup window dimensions */
1385
1386 getmaxyx(stdscr, base->height, base->width);
1387
1388 /* Make room for the status window. */
1389 base->height -= 1;
1390
1391 if (view != base) {
1392 /* Horizontal split. */
1393 view->width = base->width;
1394 view->height = SCALE_SPLIT_VIEW(base->height);
1395 base->height -= view->height;
1396
1397 /* Make room for the title bar. */
1398 view->height -= 1;
1399 }
1400
1401 /* Make room for the title bar. */
1402 base->height -= 1;
1403
1404 offset = 0;
1405
1406 foreach_displayed_view (view, i) {
1407 if (!view->win) {
1408 view->win = newwin(view->height, 0, offset, 0);
1409 if (!view->win)
1410 die("Failed to create %s view", view->name);
1411
1412 scrollok(view->win, TRUE);
1413
1414 view->title = newwin(1, 0, offset + view->height, 0);
1415 if (!view->title)
1416 die("Failed to create title window");
1417
1418 } else {
1419 wresize(view->win, view->height, view->width);
1420 mvwin(view->win, offset, 0);
1421 mvwin(view->title, offset + view->height, 0);
1422 }
1423
1424 offset += view->height + 1;
1425 }
1426 }
1427
1428 static void
1429 redraw_display(void)
1430 {
1431 struct view *view;
1432 int i;
1433
1434 foreach_displayed_view (view, i) {
1435 redraw_view(view);
1436 update_view_title(view);
1437 }
1438 }
1439
1440 static void
1441 update_display_cursor(struct view *view)
1442 {
1443 /* Move the cursor to the right-most column of the cursor line.
1444 *
1445 * XXX: This could turn out to be a bit expensive, but it ensures that
1446 * the cursor does not jump around. */
1447 if (view->lines) {
1448 wmove(view->win, view->lineno - view->offset, view->width - 1);
1449 wrefresh(view->win);
1450 }
1451 }
1452
1453 /*
1454 * Navigation
1455 */
1456
1457 /* Scrolling backend */
1458 static void
1459 do_scroll_view(struct view *view, int lines)
1460 {
1461 bool redraw_current_line = FALSE;
1462
1463 /* The rendering expects the new offset. */
1464 view->offset += lines;
1465
1466 assert(0 <= view->offset && view->offset < view->lines);
1467 assert(lines);
1468
1469 /* Move current line into the view. */
1470 if (view->lineno < view->offset) {
1471 view->lineno = view->offset;
1472 redraw_current_line = TRUE;
1473 } else if (view->lineno >= view->offset + view->height) {
1474 view->lineno = view->offset + view->height - 1;
1475 redraw_current_line = TRUE;
1476 }
1477
1478 assert(view->offset <= view->lineno && view->lineno < view->lines);
1479
1480 /* Redraw the whole screen if scrolling is pointless. */
1481 if (view->height < ABS(lines)) {
1482 redraw_view(view);
1483
1484 } else {
1485 int line = lines > 0 ? view->height - lines : 0;
1486 int end = line + ABS(lines);
1487
1488 wscrl(view->win, lines);
1489
1490 for (; line < end; line++) {
1491 if (!draw_view_line(view, line))
1492 break;
1493 }
1494
1495 if (redraw_current_line)
1496 draw_view_line(view, view->lineno - view->offset);
1497 }
1498
1499 redrawwin(view->win);
1500 wrefresh(view->win);
1501 report("");
1502 }
1503
1504 /* Scroll frontend */
1505 static void
1506 scroll_view(struct view *view, enum request request)
1507 {
1508 int lines = 1;
1509
1510 assert(view_is_displayed(view));
1511
1512 switch (request) {
1513 case REQ_SCROLL_PAGE_DOWN:
1514 lines = view->height;
1515 case REQ_SCROLL_LINE_DOWN:
1516 if (view->offset + lines > view->lines)
1517 lines = view->lines - view->offset;
1518
1519 if (lines == 0 || view->offset + view->height >= view->lines) {
1520 report("Cannot scroll beyond the last line");
1521 return;
1522 }
1523 break;
1524
1525 case REQ_SCROLL_PAGE_UP:
1526 lines = view->height;
1527 case REQ_SCROLL_LINE_UP:
1528 if (lines > view->offset)
1529 lines = view->offset;
1530
1531 if (lines == 0) {
1532 report("Cannot scroll beyond the first line");
1533 return;
1534 }
1535
1536 lines = -lines;
1537 break;
1538
1539 default:
1540 die("request %d not handled in switch", request);
1541 }
1542
1543 do_scroll_view(view, lines);
1544 }
1545
1546 /* Cursor moving */
1547 static void
1548 move_view(struct view *view, enum request request)
1549 {
1550 int scroll_steps = 0;
1551 int steps;
1552
1553 switch (request) {
1554 case REQ_MOVE_FIRST_LINE:
1555 steps = -view->lineno;
1556 break;
1557
1558 case REQ_MOVE_LAST_LINE:
1559 steps = view->lines - view->lineno - 1;
1560 break;
1561
1562 case REQ_MOVE_PAGE_UP:
1563 steps = view->height > view->lineno
1564 ? -view->lineno : -view->height;
1565 break;
1566
1567 case REQ_MOVE_PAGE_DOWN:
1568 steps = view->lineno + view->height >= view->lines
1569 ? view->lines - view->lineno - 1 : view->height;
1570 break;
1571
1572 case REQ_MOVE_UP:
1573 steps = -1;
1574 break;
1575
1576 case REQ_MOVE_DOWN:
1577 steps = 1;
1578 break;
1579
1580 default:
1581 die("request %d not handled in switch", request);
1582 }
1583
1584 if (steps <= 0 && view->lineno == 0) {
1585 report("Cannot move beyond the first line");
1586 return;
1587
1588 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1589 report("Cannot move beyond the last line");
1590 return;
1591 }
1592
1593 /* Move the current line */
1594 view->lineno += steps;
1595 assert(0 <= view->lineno && view->lineno < view->lines);
1596
1597 /* Check whether the view needs to be scrolled */
1598 if (view->lineno < view->offset ||
1599 view->lineno >= view->offset + view->height) {
1600 scroll_steps = steps;
1601 if (steps < 0 && -steps > view->offset) {
1602 scroll_steps = -view->offset;
1603
1604 } else if (steps > 0) {
1605 if (view->lineno == view->lines - 1 &&
1606 view->lines > view->height) {
1607 scroll_steps = view->lines - view->offset - 1;
1608 if (scroll_steps >= view->height)
1609 scroll_steps -= view->height - 1;
1610 }
1611 }
1612 }
1613
1614 if (!view_is_displayed(view)) {
1615 view->offset += steps;
1616 view->ops->select(view, &view->line[view->lineno]);
1617 return;
1618 }
1619
1620 /* Repaint the old "current" line if we be scrolling */
1621 if (ABS(steps) < view->height)
1622 draw_view_line(view, view->lineno - steps - view->offset);
1623
1624 if (scroll_steps) {
1625 do_scroll_view(view, scroll_steps);
1626 return;
1627 }
1628
1629 /* Draw the current line */
1630 draw_view_line(view, view->lineno - view->offset);
1631
1632 redrawwin(view->win);
1633 wrefresh(view->win);
1634 report("");
1635 }
1636
1637
1638 /*
1639 * Searching
1640 */
1641
1642 static void search_view(struct view *view, enum request request);
1643
1644 static bool
1645 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1646 {
1647 assert(view_is_displayed(view));
1648
1649 if (!view->ops->grep(view, line))
1650 return FALSE;
1651
1652 if (lineno - view->offset >= view->height) {
1653 view->offset = lineno;
1654 view->lineno = lineno;
1655 redraw_view(view);
1656
1657 } else {
1658 unsigned long old_lineno = view->lineno - view->offset;
1659
1660 view->lineno = lineno;
1661 draw_view_line(view, old_lineno);
1662
1663 draw_view_line(view, view->lineno - view->offset);
1664 redrawwin(view->win);
1665 wrefresh(view->win);
1666 }
1667
1668 report("Line %ld matches '%s'", lineno + 1, view->grep);
1669 return TRUE;
1670 }
1671
1672 static void
1673 find_next(struct view *view, enum request request)
1674 {
1675 unsigned long lineno = view->lineno;
1676 int direction;
1677
1678 if (!*view->grep) {
1679 if (!*opt_search)
1680 report("No previous search");
1681 else
1682 search_view(view, request);
1683 return;
1684 }
1685
1686 switch (request) {
1687 case REQ_SEARCH:
1688 case REQ_FIND_NEXT:
1689 direction = 1;
1690 break;
1691
1692 case REQ_SEARCH_BACK:
1693 case REQ_FIND_PREV:
1694 direction = -1;
1695 break;
1696
1697 default:
1698 return;
1699 }
1700
1701 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1702 lineno += direction;
1703
1704 /* Note, lineno is unsigned long so will wrap around in which case it
1705 * will become bigger than view->lines. */
1706 for (; lineno < view->lines; lineno += direction) {
1707 struct line *line = &view->line[lineno];
1708
1709 if (find_next_line(view, lineno, line))
1710 return;
1711 }
1712
1713 report("No match found for '%s'", view->grep);
1714 }
1715
1716 static void
1717 search_view(struct view *view, enum request request)
1718 {
1719 int regex_err;
1720
1721 if (view->regex) {
1722 regfree(view->regex);
1723 *view->grep = 0;
1724 } else {
1725 view->regex = calloc(1, sizeof(*view->regex));
1726 if (!view->regex)
1727 return;
1728 }
1729
1730 regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
1731 if (regex_err != 0) {
1732 char buf[SIZEOF_STR] = "unknown error";
1733
1734 regerror(regex_err, view->regex, buf, sizeof(buf));
1735 report("Search failed: %s", buf);
1736 return;
1737 }
1738
1739 string_copy(view->grep, opt_search);
1740
1741 find_next(view, request);
1742 }
1743
1744 /*
1745 * Incremental updating
1746 */
1747
1748 static void
1749 end_update(struct view *view)
1750 {
1751 if (!view->pipe)
1752 return;
1753 set_nonblocking_input(FALSE);
1754 if (view->pipe == stdin)
1755 fclose(view->pipe);
1756 else
1757 pclose(view->pipe);
1758 view->pipe = NULL;
1759 }
1760
1761 static bool
1762 begin_update(struct view *view)
1763 {
1764 const char *id = view->id;
1765
1766 if (view->pipe)
1767 end_update(view);
1768
1769 if (opt_cmd[0]) {
1770 string_copy(view->cmd, opt_cmd);
1771 opt_cmd[0] = 0;
1772 /* When running random commands, the view ref could have become
1773 * invalid so clear it. */
1774 view->ref[0] = 0;
1775
1776 } else if (view == VIEW(REQ_VIEW_TREE)) {
1777 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1778
1779 if (strcmp(view->vid, view->id))
1780 opt_path[0] = 0;
1781
1782 if (!string_format(view->cmd, format, id, opt_path))
1783 return FALSE;
1784
1785 } else {
1786 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1787
1788 if (!string_format(view->cmd, format, id, id, id, id, id))
1789 return FALSE;
1790 }
1791
1792 /* Special case for the pager view. */
1793 if (opt_pipe) {
1794 view->pipe = opt_pipe;
1795 opt_pipe = NULL;
1796 } else {
1797 view->pipe = popen(view->cmd, "r");
1798 }
1799
1800 if (!view->pipe)
1801 return FALSE;
1802
1803 set_nonblocking_input(TRUE);
1804
1805 view->offset = 0;
1806 view->lines = 0;
1807 view->lineno = 0;
1808 string_copy(view->vid, id);
1809
1810 if (view->line) {
1811 int i;
1812
1813 for (i = 0; i < view->lines; i++)
1814 if (view->line[i].data)
1815 free(view->line[i].data);
1816
1817 free(view->line);
1818 view->line = NULL;
1819 }
1820
1821 view->start_time = time(NULL);
1822
1823 return TRUE;
1824 }
1825
1826 static struct line *
1827 realloc_lines(struct view *view, size_t line_size)
1828 {
1829 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1830
1831 if (!tmp)
1832 return NULL;
1833
1834 view->line = tmp;
1835 view->line_size = line_size;
1836 return view->line;
1837 }
1838
1839 static bool
1840 update_view(struct view *view)
1841 {
1842 char in_buffer[BUFSIZ];
1843 char out_buffer[BUFSIZ * 2];
1844 char *line;
1845 /* The number of lines to read. If too low it will cause too much
1846 * redrawing (and possible flickering), if too high responsiveness
1847 * will suffer. */
1848 unsigned long lines = view->height;
1849 int redraw_from = -1;
1850
1851 if (!view->pipe)
1852 return TRUE;
1853
1854 /* Only redraw if lines are visible. */
1855 if (view->offset + view->height >= view->lines)
1856 redraw_from = view->lines - view->offset;
1857
1858 /* FIXME: This is probably not perfect for backgrounded views. */
1859 if (!realloc_lines(view, view->lines + lines))
1860 goto alloc_error;
1861
1862 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1863 size_t linelen = strlen(line);
1864
1865 if (linelen)
1866 line[linelen - 1] = 0;
1867
1868 if (opt_iconv != ICONV_NONE) {
1869 char *inbuf = line;
1870 size_t inlen = linelen;
1871
1872 char *outbuf = out_buffer;
1873 size_t outlen = sizeof(out_buffer);
1874
1875 size_t ret;
1876
1877 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1878 if (ret != (size_t) -1) {
1879 line = out_buffer;
1880 linelen = strlen(out_buffer);
1881 }
1882 }
1883
1884 if (!view->ops->read(view, line))
1885 goto alloc_error;
1886
1887 if (lines-- == 1)
1888 break;
1889 }
1890
1891 {
1892 int digits;
1893
1894 lines = view->lines;
1895 for (digits = 0; lines; digits++)
1896 lines /= 10;
1897
1898 /* Keep the displayed view in sync with line number scaling. */
1899 if (digits != view->digits) {
1900 view->digits = digits;
1901 redraw_from = 0;
1902 }
1903 }
1904
1905 if (!view_is_displayed(view))
1906 goto check_pipe;
1907
1908 if (view == VIEW(REQ_VIEW_TREE)) {
1909 /* Clear the view and redraw everything since the tree sorting
1910 * might have rearranged things. */
1911 redraw_view(view);
1912
1913 } else if (redraw_from >= 0) {
1914 /* If this is an incremental update, redraw the previous line
1915 * since for commits some members could have changed when
1916 * loading the main view. */
1917 if (redraw_from > 0)
1918 redraw_from--;
1919
1920 /* Incrementally draw avoids flickering. */
1921 redraw_view_from(view, redraw_from);
1922 }
1923
1924 /* Update the title _after_ the redraw so that if the redraw picks up a
1925 * commit reference in view->ref it'll be available here. */
1926 update_view_title(view);
1927
1928 check_pipe:
1929 if (ferror(view->pipe)) {
1930 report("Failed to read: %s", strerror(errno));
1931 goto end;
1932
1933 } else if (feof(view->pipe)) {
1934 report("");
1935 goto end;
1936 }
1937
1938 return TRUE;
1939
1940 alloc_error:
1941 report("Allocation failure");
1942
1943 end:
1944 end_update(view);
1945 return FALSE;
1946 }
1947
1948
1949 /*
1950 * View opening
1951 */
1952
1953 static void open_help_view(struct view *view)
1954 {
1955 char buf[BUFSIZ];
1956 int lines = ARRAY_SIZE(req_info) + 2;
1957 int i;
1958
1959 if (view->lines > 0)
1960 return;
1961
1962 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1963 if (!req_info[i].request)
1964 lines++;
1965
1966 view->line = calloc(lines, sizeof(*view->line));
1967 if (!view->line) {
1968 report("Allocation failure");
1969 return;
1970 }
1971
1972 view->ops->read(view, "Quick reference for tig keybindings:");
1973
1974 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1975 char *key;
1976
1977 if (!req_info[i].request) {
1978 view->ops->read(view, "");
1979 view->ops->read(view, req_info[i].help);
1980 continue;
1981 }
1982
1983 key = get_key(req_info[i].request);
1984 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1985 continue;
1986
1987 view->ops->read(view, buf);
1988 }
1989 }
1990
1991 enum open_flags {
1992 OPEN_DEFAULT = 0, /* Use default view switching. */
1993 OPEN_SPLIT = 1, /* Split current view. */
1994 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1995 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1996 };
1997
1998 static void
1999 open_view(struct view *prev, enum request request, enum open_flags flags)
2000 {
2001 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
2002 bool split = !!(flags & OPEN_SPLIT);
2003 bool reload = !!(flags & OPEN_RELOAD);
2004 struct view *view = VIEW(request);
2005 int nviews = displayed_views();
2006 struct view *base_view = display[0];
2007
2008 if (view == prev && nviews == 1 && !reload) {
2009 report("Already in %s view", view->name);
2010 return;
2011 }
2012
2013 if (view == VIEW(REQ_VIEW_HELP)) {
2014 open_help_view(view);
2015
2016 } else if ((reload || strcmp(view->vid, view->id)) &&
2017 !begin_update(view)) {
2018 report("Failed to load %s view", view->name);
2019 return;
2020 }
2021
2022 if (split) {
2023 display[1] = view;
2024 if (!backgrounded)
2025 current_view = 1;
2026 } else {
2027 /* Maximize the current view. */
2028 memset(display, 0, sizeof(display));
2029 current_view = 0;
2030 display[current_view] = view;
2031 }
2032
2033 /* Resize the view when switching between split- and full-screen,
2034 * or when switching between two different full-screen views. */
2035 if (nviews != displayed_views() ||
2036 (nviews == 1 && base_view != display[0]))
2037 resize_display();
2038
2039 if (split && prev->lineno - prev->offset >= prev->height) {
2040 /* Take the title line into account. */
2041 int lines = prev->lineno - prev->offset - prev->height + 1;
2042
2043 /* Scroll the view that was split if the current line is
2044 * outside the new limited view. */
2045 do_scroll_view(prev, lines);
2046 }
2047
2048 if (prev && view != prev) {
2049 if (split && !backgrounded) {
2050 /* "Blur" the previous view. */
2051 update_view_title(prev);
2052 }
2053
2054 view->parent = prev;
2055 }
2056
2057 if (view->pipe && view->lines == 0) {
2058 /* Clear the old view and let the incremental updating refill
2059 * the screen. */
2060 wclear(view->win);
2061 report("");
2062 } else {
2063 redraw_view(view);
2064 report("");
2065 }
2066
2067 /* If the view is backgrounded the above calls to report()
2068 * won't redraw the view title. */
2069 if (backgrounded)
2070 update_view_title(view);
2071 }
2072
2073
2074 /*
2075 * User request switch noodle
2076 */
2077
2078 static int
2079 view_driver(struct view *view, enum request request)
2080 {
2081 int i;
2082
2083 switch (request) {
2084 case REQ_MOVE_UP:
2085 case REQ_MOVE_DOWN:
2086 case REQ_MOVE_PAGE_UP:
2087 case REQ_MOVE_PAGE_DOWN:
2088 case REQ_MOVE_FIRST_LINE:
2089 case REQ_MOVE_LAST_LINE:
2090 move_view(view, request);
2091 break;
2092
2093 case REQ_SCROLL_LINE_DOWN:
2094 case REQ_SCROLL_LINE_UP:
2095 case REQ_SCROLL_PAGE_DOWN:
2096 case REQ_SCROLL_PAGE_UP:
2097 scroll_view(view, request);
2098 break;
2099
2100 case REQ_VIEW_BLOB:
2101 if (!ref_blob[0]) {
2102 report("No file chosen, press 't' to open tree view");
2103 break;
2104 }
2105 /* Fall-through */
2106 case REQ_VIEW_MAIN:
2107 case REQ_VIEW_DIFF:
2108 case REQ_VIEW_LOG:
2109 case REQ_VIEW_TREE:
2110 case REQ_VIEW_HELP:
2111 case REQ_VIEW_PAGER:
2112 open_view(view, request, OPEN_DEFAULT);
2113 break;
2114
2115 case REQ_NEXT:
2116 case REQ_PREVIOUS:
2117 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2118
2119 if ((view == VIEW(REQ_VIEW_DIFF) &&
2120 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2121 (view == VIEW(REQ_VIEW_BLOB) &&
2122 view->parent == VIEW(REQ_VIEW_TREE))) {
2123 view = view->parent;
2124 move_view(view, request);
2125 if (view_is_displayed(view))
2126 update_view_title(view);
2127 } else {
2128 move_view(view, request);
2129 break;
2130 }
2131 /* Fall-through */
2132
2133 case REQ_ENTER:
2134 if (!view->lines) {
2135 report("Nothing to enter");
2136 break;
2137 }
2138 return view->ops->enter(view, &view->line[view->lineno]);
2139
2140 case REQ_VIEW_NEXT:
2141 {
2142 int nviews = displayed_views();
2143 int next_view = (current_view + 1) % nviews;
2144
2145 if (next_view == current_view) {
2146 report("Only one view is displayed");
2147 break;
2148 }
2149
2150 current_view = next_view;
2151 /* Blur out the title of the previous view. */
2152 update_view_title(view);
2153 report("");
2154 break;
2155 }
2156 case REQ_TOGGLE_LINENO:
2157 opt_line_number = !opt_line_number;
2158 redraw_display();
2159 break;
2160
2161 case REQ_TOGGLE_REV_GRAPH:
2162 opt_rev_graph = !opt_rev_graph;
2163 redraw_display();
2164 break;
2165
2166 case REQ_PROMPT:
2167 /* Always reload^Wrerun commands from the prompt. */
2168 open_view(view, opt_request, OPEN_RELOAD);
2169 break;
2170
2171 case REQ_SEARCH:
2172 case REQ_SEARCH_BACK:
2173 search_view(view, request);
2174 break;
2175
2176 case REQ_FIND_NEXT:
2177 case REQ_FIND_PREV:
2178 find_next(view, request);
2179 break;
2180
2181 case REQ_STOP_LOADING:
2182 for (i = 0; i < ARRAY_SIZE(views); i++) {
2183 view = &views[i];
2184 if (view->pipe)
2185 report("Stopped loading the %s view", view->name),
2186 end_update(view);
2187 }
2188 break;
2189
2190 case REQ_SHOW_VERSION:
2191 report("%s (built %s)", VERSION, __DATE__);
2192 return TRUE;
2193
2194 case REQ_SCREEN_RESIZE:
2195 resize_display();
2196 /* Fall-through */
2197 case REQ_SCREEN_REDRAW:
2198 redraw_display();
2199 break;
2200
2201 case REQ_NONE:
2202 doupdate();
2203 return TRUE;
2204
2205 case REQ_VIEW_CLOSE:
2206 /* XXX: Mark closed views by letting view->parent point to the
2207 * view itself. Parents to closed view should never be
2208 * followed. */
2209 if (view->parent &&
2210 view->parent->parent != view->parent) {
2211 memset(display, 0, sizeof(display));
2212 current_view = 0;
2213 display[current_view] = view->parent;
2214 view->parent = view;
2215 resize_display();
2216 redraw_display();
2217 break;
2218 }
2219 /* Fall-through */
2220 case REQ_QUIT:
2221 return FALSE;
2222
2223 default:
2224 /* An unknown key will show most commonly used commands. */
2225 report("Unknown key, press 'h' for help");
2226 return TRUE;
2227 }
2228
2229 return TRUE;
2230 }
2231
2232
2233 /*
2234 * Pager backend
2235 */
2236
2237 static bool
2238 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2239 {
2240 char *text = line->data;
2241 enum line_type type = line->type;
2242 int textlen = strlen(text);
2243 int attr;
2244
2245 wmove(view->win, lineno, 0);
2246
2247 if (selected) {
2248 type = LINE_CURSOR;
2249 wchgat(view->win, -1, 0, type, NULL);
2250 }
2251
2252 attr = get_line_attr(type);
2253 wattrset(view->win, attr);
2254
2255 if (opt_line_number || opt_tab_size < TABSIZE) {
2256 static char spaces[] = " ";
2257 int col_offset = 0, col = 0;
2258
2259 if (opt_line_number) {
2260 unsigned long real_lineno = view->offset + lineno + 1;
2261
2262 if (real_lineno == 1 ||
2263 (real_lineno % opt_num_interval) == 0) {
2264 wprintw(view->win, "%.*d", view->digits, real_lineno);
2265
2266 } else {
2267 waddnstr(view->win, spaces,
2268 MIN(view->digits, STRING_SIZE(spaces)));
2269 }
2270 waddstr(view->win, ": ");
2271 col_offset = view->digits + 2;
2272 }
2273
2274 while (text && col_offset + col < view->width) {
2275 int cols_max = view->width - col_offset - col;
2276 char *pos = text;
2277 int cols;
2278
2279 if (*text == '\t') {
2280 text++;
2281 assert(sizeof(spaces) > TABSIZE);
2282 pos = spaces;
2283 cols = opt_tab_size - (col % opt_tab_size);
2284
2285 } else {
2286 text = strchr(text, '\t');
2287 cols = line ? text - pos : strlen(pos);
2288 }
2289
2290 waddnstr(view->win, pos, MIN(cols, cols_max));
2291 col += cols;
2292 }
2293
2294 } else {
2295 int col = 0, pos = 0;
2296
2297 for (; pos < textlen && col < view->width; pos++, col++)
2298 if (text[pos] == '\t')
2299 col += TABSIZE - (col % TABSIZE) - 1;
2300
2301 waddnstr(view->win, text, pos);
2302 }
2303
2304 return TRUE;
2305 }
2306
2307 static bool
2308 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2309 {
2310 char refbuf[SIZEOF_STR];
2311 char *ref = NULL;
2312 FILE *pipe;
2313
2314 if (!string_format(refbuf, "git describe %s", commit_id))
2315 return TRUE;
2316
2317 pipe = popen(refbuf, "r");
2318 if (!pipe)
2319 return TRUE;
2320
2321 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2322 ref = chomp_string(ref);
2323 pclose(pipe);
2324
2325 if (!ref || !*ref)
2326 return TRUE;
2327
2328 /* This is the only fatal call, since it can "corrupt" the buffer. */
2329 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2330 return FALSE;
2331
2332 return TRUE;
2333 }
2334
2335 static void
2336 add_pager_refs(struct view *view, struct line *line)
2337 {
2338 char buf[SIZEOF_STR];
2339 char *commit_id = line->data + STRING_SIZE("commit ");
2340 struct ref **refs;
2341 size_t bufpos = 0, refpos = 0;
2342 const char *sep = "Refs: ";
2343 bool is_tag = FALSE;
2344
2345 assert(line->type == LINE_COMMIT);
2346
2347 refs = get_refs(commit_id);
2348 if (!refs) {
2349 if (view == VIEW(REQ_VIEW_DIFF))
2350 goto try_add_describe_ref;
2351 return;
2352 }
2353
2354 do {
2355 struct ref *ref = refs[refpos];
2356 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2357
2358 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2359 return;
2360 sep = ", ";
2361 if (ref->tag)
2362 is_tag = TRUE;
2363 } while (refs[refpos++]->next);
2364
2365 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2366 try_add_describe_ref:
2367 /* Add <tag>-g<commit_id> "fake" reference. */
2368 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2369 return;
2370 }
2371
2372 if (bufpos == 0)
2373 return;
2374
2375 if (!realloc_lines(view, view->line_size + 1))
2376 return;
2377
2378 line = &view->line[view->lines];
2379 line->data = strdup(buf);
2380 if (!line->data)
2381 return;
2382
2383 line->type = LINE_PP_REFS;
2384 view->lines++;
2385 }
2386
2387 static bool
2388 pager_read(struct view *view, char *data)
2389 {
2390 struct line *line = &view->line[view->lines];
2391
2392 line->data = strdup(data);
2393 if (!line->data)
2394 return FALSE;
2395
2396 line->type = get_line_type(line->data);
2397 view->lines++;
2398
2399 if (line->type == LINE_COMMIT &&
2400 (view == VIEW(REQ_VIEW_DIFF) ||
2401 view == VIEW(REQ_VIEW_LOG)))
2402 add_pager_refs(view, line);
2403
2404 return TRUE;
2405 }
2406
2407 static bool
2408 pager_enter(struct view *view, struct line *line)
2409 {
2410 int split = 0;
2411
2412 if (line->type == LINE_COMMIT &&
2413 (view == VIEW(REQ_VIEW_LOG) ||
2414 view == VIEW(REQ_VIEW_PAGER))) {
2415 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2416 split = 1;
2417 }
2418
2419 /* Always scroll the view even if it was split. That way
2420 * you can use Enter to scroll through the log view and
2421 * split open each commit diff. */
2422 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2423
2424 /* FIXME: A minor workaround. Scrolling the view will call report("")
2425 * but if we are scrolling a non-current view this won't properly
2426 * update the view title. */
2427 if (split)
2428 update_view_title(view);
2429
2430 return TRUE;
2431 }
2432
2433 static bool
2434 pager_grep(struct view *view, struct line *line)
2435 {
2436 regmatch_t pmatch;
2437 char *text = line->data;
2438
2439 if (!*text)
2440 return FALSE;
2441
2442 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2443 return FALSE;
2444
2445 return TRUE;
2446 }
2447
2448 static void
2449 pager_select(struct view *view, struct line *line)
2450 {
2451 if (line->type == LINE_COMMIT) {
2452 char *text = line->data;
2453
2454 string_copy(view->ref, text + STRING_SIZE("commit "));
2455 string_copy(ref_commit, view->ref);
2456 }
2457 }
2458
2459 static struct view_ops pager_ops = {
2460 "line",
2461 pager_draw,
2462 pager_read,
2463 pager_enter,
2464 pager_grep,
2465 pager_select,
2466 };
2467
2468
2469 /*
2470 * Tree backend
2471 */
2472
2473 /* Parse output from git-ls-tree(1):
2474 *
2475 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2476 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2477 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2478 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2479 */
2480
2481 #define SIZEOF_TREE_ATTR \
2482 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2483
2484 #define TREE_UP_FORMAT "040000 tree %s\t.."
2485
2486 static int
2487 tree_compare_entry(enum line_type type1, char *name1,
2488 enum line_type type2, char *name2)
2489 {
2490 if (type1 != type2) {
2491 if (type1 == LINE_TREE_DIR)
2492 return -1;
2493 return 1;
2494 }
2495
2496 return strcmp(name1, name2);
2497 }
2498
2499 static bool
2500 tree_read(struct view *view, char *text)
2501 {
2502 size_t textlen = strlen(text);
2503 char buf[SIZEOF_STR];
2504 unsigned long pos;
2505 enum line_type type;
2506 bool first_read = view->lines == 0;
2507
2508 if (textlen <= SIZEOF_TREE_ATTR)
2509 return FALSE;
2510
2511 type = text[STRING_SIZE("100644 ")] == 't'
2512 ? LINE_TREE_DIR : LINE_TREE_FILE;
2513
2514 if (first_read) {
2515 /* Add path info line */
2516 if (string_format(buf, "Directory path /%s", opt_path) &&
2517 realloc_lines(view, view->line_size + 1) &&
2518 pager_read(view, buf))
2519 view->line[view->lines - 1].type = LINE_DEFAULT;
2520 else
2521 return FALSE;
2522
2523 /* Insert "link" to parent directory. */
2524 if (*opt_path &&
2525 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2526 realloc_lines(view, view->line_size + 1) &&
2527 pager_read(view, buf))
2528 view->line[view->lines - 1].type = LINE_TREE_DIR;
2529 else if (*opt_path)
2530 return FALSE;
2531 }
2532
2533 /* Strip the path part ... */
2534 if (*opt_path) {
2535 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2536 size_t striplen = strlen(opt_path);
2537 char *path = text + SIZEOF_TREE_ATTR;
2538
2539 if (pathlen > striplen)
2540 memmove(path, path + striplen,
2541 pathlen - striplen + 1);
2542 }
2543
2544 /* Skip "Directory ..." and ".." line. */
2545 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2546 struct line *line = &view->line[pos];
2547 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2548 char *path2 = text + SIZEOF_TREE_ATTR;
2549 int cmp = tree_compare_entry(line->type, path1, type, path2);
2550
2551 if (cmp <= 0)
2552 continue;
2553
2554 text = strdup(text);
2555 if (!text)
2556 return FALSE;
2557
2558 if (view->lines > pos)
2559 memmove(&view->line[pos + 1], &view->line[pos],
2560 (view->lines - pos) * sizeof(*line));
2561
2562 line = &view->line[pos];
2563 line->data = text;
2564 line->type = type;
2565 view->lines++;
2566 return TRUE;
2567 }
2568
2569 if (!pager_read(view, text))
2570 return FALSE;
2571
2572 /* Move the current line to the first tree entry. */
2573 if (first_read)
2574 view->lineno++;
2575
2576 view->line[view->lines - 1].type = type;
2577 return TRUE;
2578 }
2579
2580 static bool
2581 tree_enter(struct view *view, struct line *line)
2582 {
2583 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2584 enum request request;
2585
2586 switch (line->type) {
2587 case LINE_TREE_DIR:
2588 /* Depending on whether it is a subdir or parent (updir?) link
2589 * mangle the path buffer. */
2590 if (line == &view->line[1] && *opt_path) {
2591 size_t path_len = strlen(opt_path);
2592 char *dirsep = opt_path + path_len - 1;
2593
2594 while (dirsep > opt_path && dirsep[-1] != '/')
2595 dirsep--;
2596
2597 dirsep[0] = 0;
2598
2599 } else {
2600 size_t pathlen = strlen(opt_path);
2601 size_t origlen = pathlen;
2602 char *data = line->data;
2603 char *basename = data + SIZEOF_TREE_ATTR;
2604
2605 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2606 opt_path[origlen] = 0;
2607 return TRUE;
2608 }
2609 }
2610
2611 /* Trees and subtrees share the same ID, so they are not not
2612 * unique like blobs. */
2613 flags |= OPEN_RELOAD;
2614 request = REQ_VIEW_TREE;
2615 break;
2616
2617 case LINE_TREE_FILE:
2618 request = REQ_VIEW_BLOB;
2619 break;
2620
2621 default:
2622 return TRUE;
2623 }
2624
2625 open_view(view, request, flags);
2626
2627 return TRUE;
2628 }
2629
2630 static void
2631 tree_select(struct view *view, struct line *line)
2632 {
2633 char *text = line->data;
2634
2635 text += STRING_SIZE("100644 blob ");
2636
2637 if (line->type == LINE_TREE_FILE) {
2638 string_ncopy(ref_blob, text, 40);
2639 /* Also update the blob view's ref, since all there must always
2640 * be in sync. */
2641 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2642
2643 } else if (line->type != LINE_TREE_DIR) {
2644 return;
2645 }
2646
2647 string_ncopy(view->ref, text, 40);
2648 }
2649
2650 static struct view_ops tree_ops = {
2651 "file",
2652 pager_draw,
2653 tree_read,
2654 tree_enter,
2655 pager_grep,
2656 tree_select,
2657 };
2658
2659 static bool
2660 blob_read(struct view *view, char *line)
2661 {
2662 bool state = pager_read(view, line);
2663
2664 if (state == TRUE)
2665 view->line[view->lines - 1].type = LINE_DEFAULT;
2666
2667 return state;
2668 }
2669
2670 static struct view_ops blob_ops = {
2671 "line",
2672 pager_draw,
2673 blob_read,
2674 pager_enter,
2675 pager_grep,
2676 pager_select,
2677 };
2678
2679
2680 /*
2681 * Main view backend
2682 */
2683
2684 struct commit {
2685 char id[SIZEOF_REV]; /* SHA1 ID. */
2686 char title[128]; /* First line of the commit message. */
2687 char author[75]; /* Author of the commit. */
2688 struct tm time; /* Date from the author ident. */
2689 struct ref **refs; /* Repository references. */
2690 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2691 size_t graph_size; /* The width of the graph array. */
2692 };
2693
2694 static bool
2695 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2696 {
2697 char buf[DATE_COLS + 1];
2698 struct commit *commit = line->data;
2699 enum line_type type;
2700 int col = 0;
2701 size_t timelen;
2702 size_t authorlen;
2703 int trimmed = 1;
2704
2705 if (!*commit->author)
2706 return FALSE;
2707
2708 wmove(view->win, lineno, col);
2709
2710 if (selected) {
2711 type = LINE_CURSOR;
2712 wattrset(view->win, get_line_attr(type));
2713 wchgat(view->win, -1, 0, type, NULL);
2714
2715 } else {
2716 type = LINE_MAIN_COMMIT;
2717 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2718 }
2719
2720 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2721 waddnstr(view->win, buf, timelen);
2722 waddstr(view->win, " ");
2723
2724 col += DATE_COLS;
2725 wmove(view->win, lineno, col);
2726 if (type != LINE_CURSOR)
2727 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2728
2729 if (opt_utf8) {
2730 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2731 } else {
2732 authorlen = strlen(commit->author);
2733 if (authorlen > AUTHOR_COLS - 2) {
2734 authorlen = AUTHOR_COLS - 2;
2735 trimmed = 1;
2736 }
2737 }
2738
2739 if (trimmed) {
2740 waddnstr(view->win, commit->author, authorlen);
2741 if (type != LINE_CURSOR)
2742 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2743 waddch(view->win, '~');
2744 } else {
2745 waddstr(view->win, commit->author);
2746 }
2747
2748 col += AUTHOR_COLS;
2749 if (type != LINE_CURSOR)
2750 wattrset(view->win, A_NORMAL);
2751
2752 if (opt_rev_graph && commit->graph_size) {
2753 size_t i;
2754
2755 wmove(view->win, lineno, col);
2756 /* Using waddch() instead of waddnstr() ensures that
2757 * they'll be rendered correctly for the cursor line. */
2758 for (i = 0; i < commit->graph_size; i++)
2759 waddch(view->win, commit->graph[i]);
2760
2761 col += commit->graph_size + 1;
2762 }
2763
2764 wmove(view->win, lineno, col);
2765
2766 if (commit->refs) {
2767 size_t i = 0;
2768
2769 do {
2770 if (type == LINE_CURSOR)
2771 ;
2772 else if (commit->refs[i]->tag)
2773 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2774 else
2775 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2776 waddstr(view->win, "[");
2777 waddstr(view->win, commit->refs[i]->name);
2778 waddstr(view->win, "]");
2779 if (type != LINE_CURSOR)
2780 wattrset(view->win, A_NORMAL);
2781 waddstr(view->win, " ");
2782 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2783 } while (commit->refs[i++]->next);
2784 }
2785
2786 if (type != LINE_CURSOR)
2787 wattrset(view->win, get_line_attr(type));
2788
2789 {
2790 int titlelen = strlen(commit->title);
2791
2792 if (col + titlelen > view->width)
2793 titlelen = view->width - col;
2794
2795 waddnstr(view->win, commit->title, titlelen);
2796 }
2797
2798 return TRUE;
2799 }
2800
2801 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2802 static bool
2803 main_read(struct view *view, char *line)
2804 {
2805 enum line_type type = get_line_type(line);
2806 struct commit *commit = view->lines
2807 ? view->line[view->lines - 1].data : NULL;
2808
2809 switch (type) {
2810 case LINE_COMMIT:
2811 commit = calloc(1, sizeof(struct commit));
2812 if (!commit)
2813 return FALSE;
2814
2815 line += STRING_SIZE("commit ");
2816
2817 view->line[view->lines++].data = commit;
2818 string_copy(commit->id, line);
2819 commit->refs = get_refs(commit->id);
2820 commit->graph[commit->graph_size++] = ACS_LTEE;
2821 break;
2822
2823 case LINE_AUTHOR:
2824 {
2825 char *ident = line + STRING_SIZE("author ");
2826 char *end = strchr(ident, '<');
2827
2828 if (!commit)
2829 break;
2830
2831 if (end) {
2832 char *email = end + 1;
2833
2834 for (; end > ident && isspace(end[-1]); end--) ;
2835
2836 if (end == ident && *email) {
2837 ident = email;
2838 end = strchr(ident, '>');
2839 for (; end > ident && isspace(end[-1]); end--) ;
2840 }
2841 *end = 0;
2842 }
2843
2844 /* End is NULL or ident meaning there's no author. */
2845 if (end <= ident)
2846 ident = "Unknown";
2847
2848 string_copy(commit->author, ident);
2849
2850 /* Parse epoch and timezone */
2851 if (end) {
2852 char *secs = strchr(end + 1, '>');
2853 char *zone;
2854 time_t time;
2855
2856 if (!secs || secs[1] != ' ')
2857 break;
2858
2859 secs += 2;
2860 time = (time_t) atol(secs);
2861 zone = strchr(secs, ' ');
2862 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2863 long tz;
2864
2865 zone++;
2866 tz = ('0' - zone[1]) * 60 * 60 * 10;
2867 tz += ('0' - zone[2]) * 60 * 60;
2868 tz += ('0' - zone[3]) * 60;
2869 tz += ('0' - zone[4]) * 60;
2870
2871 if (zone[0] == '-')
2872 tz = -tz;
2873
2874 time -= tz;
2875 }
2876 gmtime_r(&time, &commit->time);
2877 }
2878 break;
2879 }
2880 default:
2881 if (!commit)
2882 break;
2883
2884 /* Fill in the commit title if it has not already been set. */
2885 if (commit->title[0])
2886 break;
2887
2888 /* Require titles to start with a non-space character at the
2889 * offset used by git log. */
2890 /* FIXME: More gracefull handling of titles; append "..." to
2891 * shortened titles, etc. */
2892 if (strncmp(line, " ", 4) ||
2893 isspace(line[4]))
2894 break;
2895
2896 string_copy(commit->title, line + 4);
2897 }
2898
2899 return TRUE;
2900 }
2901
2902 static bool
2903 main_enter(struct view *view, struct line *line)
2904 {
2905 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2906
2907 open_view(view, REQ_VIEW_DIFF, flags);
2908 return TRUE;
2909 }
2910
2911 static bool
2912 main_grep(struct view *view, struct line *line)
2913 {
2914 struct commit *commit = line->data;
2915 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
2916 char buf[DATE_COLS + 1];
2917 regmatch_t pmatch;
2918
2919 for (state = S_TITLE; state < S_END; state++) {
2920 char *text;
2921
2922 switch (state) {
2923 case S_TITLE: text = commit->title; break;
2924 case S_AUTHOR: text = commit->author; break;
2925 case S_DATE:
2926 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
2927 continue;
2928 text = buf;
2929 break;
2930
2931 default:
2932 return FALSE;
2933 }
2934
2935 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
2936 return TRUE;
2937 }
2938
2939 return FALSE;
2940 }
2941
2942 static void
2943 main_select(struct view *view, struct line *line)
2944 {
2945 struct commit *commit = line->data;
2946
2947 string_copy(view->ref, commit->id);
2948 string_copy(ref_commit, view->ref);
2949 }
2950
2951 static struct view_ops main_ops = {
2952 "commit",
2953 main_draw,
2954 main_read,
2955 main_enter,
2956 main_grep,
2957 main_select,
2958 };
2959
2960
2961 /*
2962 * Unicode / UTF-8 handling
2963 *
2964 * NOTE: Much of the following code for dealing with unicode is derived from
2965 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2966 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2967 */
2968
2969 /* I've (over)annotated a lot of code snippets because I am not entirely
2970 * confident that the approach taken by this small UTF-8 interface is correct.
2971 * --jonas */
2972
2973 static inline int
2974 unicode_width(unsigned long c)
2975 {
2976 if (c >= 0x1100 &&
2977 (c <= 0x115f /* Hangul Jamo */
2978 || c == 0x2329
2979 || c == 0x232a
2980 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2981 /* CJK ... Yi */
2982 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2983 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2984 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2985 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2986 || (c >= 0xffe0 && c <= 0xffe6)
2987 || (c >= 0x20000 && c <= 0x2fffd)
2988 || (c >= 0x30000 && c <= 0x3fffd)))
2989 return 2;
2990
2991 return 1;
2992 }
2993
2994 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2995 * Illegal bytes are set one. */
2996 static const unsigned char utf8_bytes[256] = {
2997 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2998 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2999 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,
3000 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,
3001 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,
3002 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,
3003 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,
3004 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,
3005 };
3006
3007 /* Decode UTF-8 multi-byte representation into a unicode character. */
3008 static inline unsigned long
3009 utf8_to_unicode(const char *string, size_t length)
3010 {
3011 unsigned long unicode;
3012
3013 switch (length) {
3014 case 1:
3015 unicode = string[0];
3016 break;
3017 case 2:
3018 unicode = (string[0] & 0x1f) << 6;
3019 unicode += (string[1] & 0x3f);
3020 break;
3021 case 3:
3022 unicode = (string[0] & 0x0f) << 12;
3023 unicode += ((string[1] & 0x3f) << 6);
3024 unicode += (string[2] & 0x3f);
3025 break;
3026 case 4:
3027 unicode = (string[0] & 0x0f) << 18;
3028 unicode += ((string[1] & 0x3f) << 12);
3029 unicode += ((string[2] & 0x3f) << 6);
3030 unicode += (string[3] & 0x3f);
3031 break;
3032 case 5:
3033 unicode = (string[0] & 0x0f) << 24;
3034 unicode += ((string[1] & 0x3f) << 18);
3035 unicode += ((string[2] & 0x3f) << 12);
3036 unicode += ((string[3] & 0x3f) << 6);
3037 unicode += (string[4] & 0x3f);
3038 break;
3039 case 6:
3040 unicode = (string[0] & 0x01) << 30;
3041 unicode += ((string[1] & 0x3f) << 24);
3042 unicode += ((string[2] & 0x3f) << 18);
3043 unicode += ((string[3] & 0x3f) << 12);
3044 unicode += ((string[4] & 0x3f) << 6);
3045 unicode += (string[5] & 0x3f);
3046 break;
3047 default:
3048 die("Invalid unicode length");
3049 }
3050
3051 /* Invalid characters could return the special 0xfffd value but NUL
3052 * should be just as good. */
3053 return unicode > 0xffff ? 0 : unicode;
3054 }
3055
3056 /* Calculates how much of string can be shown within the given maximum width
3057 * and sets trimmed parameter to non-zero value if all of string could not be
3058 * shown.
3059 *
3060 * Additionally, adds to coloffset how many many columns to move to align with
3061 * the expected position. Takes into account how multi-byte and double-width
3062 * characters will effect the cursor position.
3063 *
3064 * Returns the number of bytes to output from string to satisfy max_width. */
3065 static size_t
3066 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3067 {
3068 const char *start = string;
3069 const char *end = strchr(string, '\0');
3070 size_t mbwidth = 0;
3071 size_t width = 0;
3072
3073 *trimmed = 0;
3074
3075 while (string < end) {
3076 int c = *(unsigned char *) string;
3077 unsigned char bytes = utf8_bytes[c];
3078 size_t ucwidth;
3079 unsigned long unicode;
3080
3081 if (string + bytes > end)
3082 break;
3083
3084 /* Change representation to figure out whether
3085 * it is a single- or double-width character. */
3086
3087 unicode = utf8_to_unicode(string, bytes);
3088 /* FIXME: Graceful handling of invalid unicode character. */
3089 if (!unicode)
3090 break;
3091
3092 ucwidth = unicode_width(unicode);
3093 width += ucwidth;
3094 if (width > max_width) {
3095 *trimmed = 1;
3096 break;
3097 }
3098
3099 /* The column offset collects the differences between the
3100 * number of bytes encoding a character and the number of
3101 * columns will be used for rendering said character.
3102 *
3103 * So if some character A is encoded in 2 bytes, but will be
3104 * represented on the screen using only 1 byte this will and up
3105 * adding 1 to the multi-byte column offset.
3106 *
3107 * Assumes that no double-width character can be encoding in
3108 * less than two bytes. */
3109 if (bytes > ucwidth)
3110 mbwidth += bytes - ucwidth;
3111
3112 string += bytes;
3113 }
3114
3115 *coloffset += mbwidth;
3116
3117 return string - start;
3118 }
3119
3120
3121 /*
3122 * Status management
3123 */
3124
3125 /* Whether or not the curses interface has been initialized. */
3126 static bool cursed = FALSE;
3127
3128 /* The status window is used for polling keystrokes. */
3129 static WINDOW *status_win;
3130
3131 static bool status_empty = TRUE;
3132
3133 /* Update status and title window. */
3134 static void
3135 report(const char *msg, ...)
3136 {
3137 struct view *view = display[current_view];
3138
3139 if (input_mode)
3140 return;
3141
3142 if (!status_empty || *msg) {
3143 va_list args;
3144
3145 va_start(args, msg);
3146
3147 wmove(status_win, 0, 0);
3148 if (*msg) {
3149 vwprintw(status_win, msg, args);
3150 status_empty = FALSE;
3151 } else {
3152 status_empty = TRUE;
3153 }
3154 wclrtoeol(status_win);
3155 wrefresh(status_win);
3156
3157 va_end(args);
3158 }
3159
3160 update_view_title(view);
3161 update_display_cursor(view);
3162 }
3163
3164 /* Controls when nodelay should be in effect when polling user input. */
3165 static void
3166 set_nonblocking_input(bool loading)
3167 {
3168 static unsigned int loading_views;
3169
3170 if ((loading == FALSE && loading_views-- == 1) ||
3171 (loading == TRUE && loading_views++ == 0))
3172 nodelay(status_win, loading);
3173 }
3174
3175 static void
3176 init_display(void)
3177 {
3178 int x, y;
3179
3180 /* Initialize the curses library */
3181 if (isatty(STDIN_FILENO)) {
3182 cursed = !!initscr();
3183 } else {
3184 /* Leave stdin and stdout alone when acting as a pager. */
3185 FILE *io = fopen("/dev/tty", "r+");
3186
3187 if (!io)
3188 die("Failed to open /dev/tty");
3189 cursed = !!newterm(NULL, io, io);
3190 }
3191
3192 if (!cursed)
3193 die("Failed to initialize curses");
3194
3195 nonl(); /* Tell curses not to do NL->CR/NL on output */
3196 cbreak(); /* Take input chars one at a time, no wait for \n */
3197 noecho(); /* Don't echo input */
3198 leaveok(stdscr, TRUE);
3199
3200 if (has_colors())
3201 init_colors();
3202
3203 getmaxyx(stdscr, y, x);
3204 status_win = newwin(1, 0, y - 1, 0);
3205 if (!status_win)
3206 die("Failed to create status window");
3207
3208 /* Enable keyboard mapping */
3209 keypad(status_win, TRUE);
3210 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3211 }
3212
3213 static char *
3214 read_prompt(const char *prompt)
3215 {
3216 enum { READING, STOP, CANCEL } status = READING;
3217 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3218 int pos = 0;
3219
3220 while (status == READING) {
3221 struct view *view;
3222 int i, key;
3223
3224 input_mode = TRUE;
3225
3226 foreach_view (view, i)
3227 update_view(view);
3228
3229 input_mode = FALSE;
3230
3231 mvwprintw(status_win, 0, 0, "%s%.*s", prompt, pos, buf);
3232 wclrtoeol(status_win);
3233
3234 /* Refresh, accept single keystroke of input */
3235 key = wgetch(status_win);
3236 switch (key) {
3237 case KEY_RETURN:
3238 case KEY_ENTER:
3239 case '\n':
3240 status = pos ? STOP : CANCEL;
3241 break;
3242
3243 case KEY_BACKSPACE:
3244 if (pos > 0)
3245 pos--;
3246 else
3247 status = CANCEL;
3248 break;
3249
3250 case KEY_ESC:
3251 status = CANCEL;
3252 break;
3253
3254 case ERR:
3255 break;
3256
3257 default:
3258 if (pos >= sizeof(buf)) {
3259 report("Input string too long");
3260 return NULL;
3261 }
3262
3263 if (isprint(key))
3264 buf[pos++] = (char) key;
3265 }
3266 }
3267
3268 /* Clear the status window */
3269 status_empty = FALSE;
3270 report("");
3271
3272 if (status == CANCEL)
3273 return NULL;
3274
3275 buf[pos++] = 0;
3276
3277 return buf;
3278 }
3279
3280 /*
3281 * Repository references
3282 */
3283
3284 static struct ref *refs;
3285 static size_t refs_size;
3286
3287 /* Id <-> ref store */
3288 static struct ref ***id_refs;
3289 static size_t id_refs_size;
3290
3291 static struct ref **
3292 get_refs(char *id)
3293 {
3294 struct ref ***tmp_id_refs;
3295 struct ref **ref_list = NULL;
3296 size_t ref_list_size = 0;
3297 size_t i;
3298
3299 for (i = 0; i < id_refs_size; i++)
3300 if (!strcmp(id, id_refs[i][0]->id))
3301 return id_refs[i];
3302
3303 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3304 if (!tmp_id_refs)
3305 return NULL;
3306
3307 id_refs = tmp_id_refs;
3308
3309 for (i = 0; i < refs_size; i++) {
3310 struct ref **tmp;
3311
3312 if (strcmp(id, refs[i].id))
3313 continue;
3314
3315 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3316 if (!tmp) {
3317 if (ref_list)
3318 free(ref_list);
3319 return NULL;
3320 }
3321
3322 ref_list = tmp;
3323 if (ref_list_size > 0)
3324 ref_list[ref_list_size - 1]->next = 1;
3325 ref_list[ref_list_size] = &refs[i];
3326
3327 /* XXX: The properties of the commit chains ensures that we can
3328 * safely modify the shared ref. The repo references will
3329 * always be similar for the same id. */
3330 ref_list[ref_list_size]->next = 0;
3331 ref_list_size++;
3332 }
3333
3334 if (ref_list)
3335 id_refs[id_refs_size++] = ref_list;
3336
3337 return ref_list;
3338 }
3339
3340 static int
3341 read_ref(char *id, int idlen, char *name, int namelen)
3342 {
3343 struct ref *ref;
3344 bool tag = FALSE;
3345
3346 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3347 /* Commits referenced by tags has "^{}" appended. */
3348 if (name[namelen - 1] != '}')
3349 return OK;
3350
3351 while (namelen > 0 && name[namelen] != '^')
3352 namelen--;
3353
3354 tag = TRUE;
3355 namelen -= STRING_SIZE("refs/tags/");
3356 name += STRING_SIZE("refs/tags/");
3357
3358 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3359 namelen -= STRING_SIZE("refs/heads/");
3360 name += STRING_SIZE("refs/heads/");
3361
3362 } else if (!strcmp(name, "HEAD")) {
3363 return OK;
3364 }
3365
3366 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3367 if (!refs)
3368 return ERR;
3369
3370 ref = &refs[refs_size++];
3371 ref->name = malloc(namelen + 1);
3372 if (!ref->name)
3373 return ERR;
3374
3375 strncpy(ref->name, name, namelen);
3376 ref->name[namelen] = 0;
3377 ref->tag = tag;
3378 string_copy(ref->id, id);
3379
3380 return OK;
3381 }
3382
3383 static int
3384 load_refs(void)
3385 {
3386 const char *cmd_env = getenv("TIG_LS_REMOTE");
3387 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3388
3389 return read_properties(popen(cmd, "r"), "\t", read_ref);
3390 }
3391
3392 static int
3393 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3394 {
3395 if (!strcmp(name, "i18n.commitencoding"))
3396 string_copy(opt_encoding, value);
3397
3398 return OK;
3399 }
3400
3401 static int
3402 load_repo_config(void)
3403 {
3404 return read_properties(popen("git repo-config --list", "r"),
3405 "=", read_repo_config_option);
3406 }
3407
3408 static int
3409 read_properties(FILE *pipe, const char *separators,
3410 int (*read_property)(char *, int, char *, int))
3411 {
3412 char buffer[BUFSIZ];
3413 char *name;
3414 int state = OK;
3415
3416 if (!pipe)
3417 return ERR;
3418
3419 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3420 char *value;
3421 size_t namelen;
3422 size_t valuelen;
3423
3424 name = chomp_string(name);
3425 namelen = strcspn(name, separators);
3426
3427 if (name[namelen]) {
3428 name[namelen] = 0;
3429 value = chomp_string(name + namelen + 1);
3430 valuelen = strlen(value);
3431
3432 } else {
3433 value = "";
3434 valuelen = 0;
3435 }
3436
3437 state = read_property(name, namelen, value, valuelen);
3438 }
3439
3440 if (state != ERR && ferror(pipe))
3441 state = ERR;
3442
3443 pclose(pipe);
3444
3445 return state;
3446 }
3447
3448
3449 /*
3450 * Main
3451 */
3452
3453 static void __NORETURN
3454 quit(int sig)
3455 {
3456 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3457 if (cursed)
3458 endwin();
3459 exit(0);
3460 }
3461
3462 static void __NORETURN
3463 die(const char *err, ...)
3464 {
3465 va_list args;
3466
3467 endwin();
3468
3469 va_start(args, err);
3470 fputs("tig: ", stderr);
3471 vfprintf(stderr, err, args);
3472 fputs("\n", stderr);
3473 va_end(args);
3474
3475 exit(1);
3476 }
3477
3478 int
3479 main(int argc, char *argv[])
3480 {
3481 struct view *view;
3482 enum request request;
3483 size_t i;
3484
3485 signal(SIGINT, quit);
3486
3487 if (setlocale(LC_ALL, "")) {
3488 string_copy(opt_codeset, nl_langinfo(CODESET));
3489 }
3490
3491 if (load_options() == ERR)
3492 die("Failed to load user config.");
3493
3494 /* Load the repo config file so options can be overwritten from
3495 * the command line. */
3496 if (load_repo_config() == ERR)
3497 die("Failed to load repo config.");
3498
3499 if (!parse_options(argc, argv))
3500 return 0;
3501
3502 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3503 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3504 if (opt_iconv == ICONV_NONE)
3505 die("Failed to initialize character set conversion");
3506 }
3507
3508 if (load_refs() == ERR)
3509 die("Failed to load refs.");
3510
3511 /* Require a git repository unless when running in pager mode. */
3512 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3513 die("Not a git repository");
3514
3515 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3516 view->cmd_env = getenv(view->cmd_env);
3517
3518 request = opt_request;
3519
3520 init_display();
3521
3522 while (view_driver(display[current_view], request)) {
3523 int key;
3524 int i;
3525
3526 foreach_view (view, i)
3527 update_view(view);
3528
3529 /* Refresh, accept single keystroke of input */
3530 key = wgetch(status_win);
3531
3532 /* wgetch() with nodelay() enabled returns ERR when there's no
3533 * input. */
3534 if (key == ERR) {
3535 request = REQ_NONE;
3536 continue;
3537 }
3538
3539 request = get_keybinding(display[current_view]->keymap, key);
3540
3541 /* Some low-level request handling. This keeps access to
3542 * status_win restricted. */
3543 switch (request) {
3544 case REQ_PROMPT:
3545 {
3546 char *cmd = read_prompt(":");
3547
3548 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3549 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3550 opt_request = REQ_VIEW_DIFF;
3551 } else {
3552 opt_request = REQ_VIEW_PAGER;
3553 }
3554 break;
3555 }
3556
3557 request = REQ_NONE;
3558 break;
3559 }
3560 case REQ_SEARCH:
3561 case REQ_SEARCH_BACK:
3562 {
3563 const char *prompt = request == REQ_SEARCH
3564 ? "/" : "?";
3565 char *search = read_prompt(prompt);
3566
3567 if (search)
3568 string_copy(opt_search, search);
3569 else
3570 request = REQ_NONE;
3571 break;
3572 }
3573 case REQ_SCREEN_RESIZE:
3574 {
3575 int height, width;
3576
3577 getmaxyx(stdscr, height, width);
3578
3579 /* Resize the status view and let the view driver take
3580 * care of resizing the displayed views. */
3581 wresize(status_win, 1, width);
3582 mvwin(status_win, height - 1, 0);
3583 wrefresh(status_win);
3584 break;
3585 }
3586 default:
3587 break;
3588 }
3589 }
3590
3591 quit(0);
3592
3593 return 0;
3594 }
Full-screen terminal Git browser.