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Add selected arg to the view draw operation
[tig] / tig.c
1 /* Copyright (c) 2006 Jonas Fonseca <fonseca@diku.dk>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #ifndef VERSION
15 #define VERSION "tig-0.4.git"
16 #endif
17
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
32
33 #include <sys/types.h>
34 #include <regex.h>
35
36 #include <locale.h>
37 #include <langinfo.h>
38 #include <iconv.h>
39
40 #include <curses.h>
41
42 #if __GNUC__ >= 3
43 #define __NORETURN __attribute__((__noreturn__))
44 #else
45 #define __NORETURN
46 #endif
47
48 static void __NORETURN die(const char *err, ...);
49 static void report(const char *msg, ...);
50 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
51 static void set_nonblocking_input(bool loading);
52 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
53
54 #define ABS(x) ((x) >= 0 ? (x) : -(x))
55 #define MIN(x, y) ((x) < (y) ? (x) : (y))
56
57 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
58 #define STRING_SIZE(x) (sizeof(x) - 1)
59
60 #define SIZEOF_STR 1024 /* Default string size. */
61 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
62 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
63
64 /* This color name can be used to refer to the default term colors. */
65 #define COLOR_DEFAULT (-1)
66
67 #define ICONV_NONE ((iconv_t) -1)
68
69 /* The format and size of the date column in the main view. */
70 #define DATE_FORMAT "%Y-%m-%d %H:%M"
71 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
72
73 #define AUTHOR_COLS 20
74
75 /* The default interval between line numbers. */
76 #define NUMBER_INTERVAL 1
77
78 #define TABSIZE 8
79
80 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
81
82 #define TIG_LS_REMOTE \
83 "git ls-remote . 2>/dev/null"
84
85 #define TIG_DIFF_CMD \
86 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
87
88 #define TIG_LOG_CMD \
89 "git log --cc --stat -n100 %s 2>/dev/null"
90
91 #define TIG_MAIN_CMD \
92 "git log --topo-order --pretty=raw %s 2>/dev/null"
93
94 #define TIG_TREE_CMD \
95 "git ls-tree %s %s"
96
97 #define TIG_BLOB_CMD \
98 "git cat-file blob %s"
99
100 /* XXX: Needs to be defined to the empty string. */
101 #define TIG_HELP_CMD ""
102 #define TIG_PAGER_CMD ""
103
104 /* Some ascii-shorthands fitted into the ncurses namespace. */
105 #define KEY_TAB '\t'
106 #define KEY_RETURN '\r'
107 #define KEY_ESC 27
108
109
110 struct ref {
111 char *name; /* Ref name; tag or head names are shortened. */
112 char id[41]; /* Commit SHA1 ID */
113 unsigned int tag:1; /* Is it a tag? */
114 unsigned int next:1; /* For ref lists: are there more refs? */
115 };
116
117 static struct ref **get_refs(char *id);
118
119 struct int_map {
120 const char *name;
121 int namelen;
122 int value;
123 };
124
125 static int
126 set_from_int_map(struct int_map *map, size_t map_size,
127 int *value, const char *name, int namelen)
128 {
129
130 int i;
131
132 for (i = 0; i < map_size; i++)
133 if (namelen == map[i].namelen &&
134 !strncasecmp(name, map[i].name, namelen)) {
135 *value = map[i].value;
136 return OK;
137 }
138
139 return ERR;
140 }
141
142
143 /*
144 * String helpers
145 */
146
147 static inline void
148 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
149 {
150 if (srclen > dstlen - 1)
151 srclen = dstlen - 1;
152
153 strncpy(dst, src, srclen);
154 dst[srclen] = 0;
155 }
156
157 /* Shorthands for safely copying into a fixed buffer. */
158
159 #define string_copy(dst, src) \
160 string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
161
162 #define string_ncopy(dst, src, srclen) \
163 string_ncopy_do(dst, sizeof(dst), src, srclen)
164
165 static char *
166 chomp_string(char *name)
167 {
168 int namelen;
169
170 while (isspace(*name))
171 name++;
172
173 namelen = strlen(name) - 1;
174 while (namelen > 0 && isspace(name[namelen]))
175 name[namelen--] = 0;
176
177 return name;
178 }
179
180 static bool
181 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
182 {
183 va_list args;
184 size_t pos = bufpos ? *bufpos : 0;
185
186 va_start(args, fmt);
187 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
188 va_end(args);
189
190 if (bufpos)
191 *bufpos = pos;
192
193 return pos >= bufsize ? FALSE : TRUE;
194 }
195
196 #define string_format(buf, fmt, args...) \
197 string_nformat(buf, sizeof(buf), NULL, fmt, args)
198
199 #define string_format_from(buf, from, fmt, args...) \
200 string_nformat(buf, sizeof(buf), from, fmt, args)
201
202 static int
203 string_enum_compare(const char *str1, const char *str2, int len)
204 {
205 size_t i;
206
207 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
208
209 /* Diff-Header == DIFF_HEADER */
210 for (i = 0; i < len; i++) {
211 if (toupper(str1[i]) == toupper(str2[i]))
212 continue;
213
214 if (string_enum_sep(str1[i]) &&
215 string_enum_sep(str2[i]))
216 continue;
217
218 return str1[i] - str2[i];
219 }
220
221 return 0;
222 }
223
224 /* Shell quoting
225 *
226 * NOTE: The following is a slightly modified copy of the git project's shell
227 * quoting routines found in the quote.c file.
228 *
229 * Help to copy the thing properly quoted for the shell safety. any single
230 * quote is replaced with '\'', any exclamation point is replaced with '\!',
231 * and the whole thing is enclosed in a
232 *
233 * E.g.
234 * original sq_quote result
235 * name ==> name ==> 'name'
236 * a b ==> a b ==> 'a b'
237 * a'b ==> a'\''b ==> 'a'\''b'
238 * a!b ==> a'\!'b ==> 'a'\!'b'
239 */
240
241 static size_t
242 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
243 {
244 char c;
245
246 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
247
248 BUFPUT('\'');
249 while ((c = *src++)) {
250 if (c == '\'' || c == '!') {
251 BUFPUT('\'');
252 BUFPUT('\\');
253 BUFPUT(c);
254 BUFPUT('\'');
255 } else {
256 BUFPUT(c);
257 }
258 }
259 BUFPUT('\'');
260
261 return bufsize;
262 }
263
264
265 /*
266 * User requests
267 */
268
269 #define REQ_INFO \
270 /* XXX: Keep the view request first and in sync with views[]. */ \
271 REQ_GROUP("View switching") \
272 REQ_(VIEW_MAIN, "Show main view"), \
273 REQ_(VIEW_DIFF, "Show diff view"), \
274 REQ_(VIEW_LOG, "Show log view"), \
275 REQ_(VIEW_TREE, "Show tree view"), \
276 REQ_(VIEW_BLOB, "Show blob view"), \
277 REQ_(VIEW_HELP, "Show help page"), \
278 REQ_(VIEW_PAGER, "Show pager view"), \
279 \
280 REQ_GROUP("View manipulation") \
281 REQ_(ENTER, "Enter current line and scroll"), \
282 REQ_(NEXT, "Move to next"), \
283 REQ_(PREVIOUS, "Move to previous"), \
284 REQ_(VIEW_NEXT, "Move focus to next view"), \
285 REQ_(VIEW_CLOSE, "Close the current view"), \
286 REQ_(QUIT, "Close all views and quit"), \
287 \
288 REQ_GROUP("Cursor navigation") \
289 REQ_(MOVE_UP, "Move cursor one line up"), \
290 REQ_(MOVE_DOWN, "Move cursor one line down"), \
291 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
292 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
293 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
294 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
295 \
296 REQ_GROUP("Scrolling") \
297 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
298 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
299 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
300 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
301 \
302 REQ_GROUP("Searching") \
303 REQ_(SEARCH, "Search the view"), \
304 REQ_(SEARCH_BACK, "Search backwards in the view"), \
305 REQ_(FIND_NEXT, "Find next search match"), \
306 REQ_(FIND_PREV, "Find previous search match"), \
307 \
308 REQ_GROUP("Misc") \
309 REQ_(NONE, "Do nothing"), \
310 REQ_(PROMPT, "Bring up the prompt"), \
311 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
312 REQ_(SCREEN_RESIZE, "Resize the screen"), \
313 REQ_(SHOW_VERSION, "Show version information"), \
314 REQ_(STOP_LOADING, "Stop all loading views"), \
315 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
316 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
317
318
319 /* User action requests. */
320 enum request {
321 #define REQ_GROUP(help)
322 #define REQ_(req, help) REQ_##req
323
324 /* Offset all requests to avoid conflicts with ncurses getch values. */
325 REQ_OFFSET = KEY_MAX + 1,
326 REQ_INFO,
327 REQ_UNKNOWN,
328
329 #undef REQ_GROUP
330 #undef REQ_
331 };
332
333 struct request_info {
334 enum request request;
335 char *name;
336 int namelen;
337 char *help;
338 };
339
340 static struct request_info req_info[] = {
341 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
342 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
343 REQ_INFO
344 #undef REQ_GROUP
345 #undef REQ_
346 };
347
348 static enum request
349 get_request(const char *name)
350 {
351 int namelen = strlen(name);
352 int i;
353
354 for (i = 0; i < ARRAY_SIZE(req_info); i++)
355 if (req_info[i].namelen == namelen &&
356 !string_enum_compare(req_info[i].name, name, namelen))
357 return req_info[i].request;
358
359 return REQ_UNKNOWN;
360 }
361
362
363 /*
364 * Options
365 */
366
367 static const char usage[] =
368 VERSION " (" __DATE__ ")\n"
369 "\n"
370 "Usage: tig [options]\n"
371 " or: tig [options] [--] [git log options]\n"
372 " or: tig [options] log [git log options]\n"
373 " or: tig [options] diff [git diff options]\n"
374 " or: tig [options] show [git show options]\n"
375 " or: tig [options] < [git command output]\n"
376 "\n"
377 "Options:\n"
378 " -l Start up in log view\n"
379 " -d Start up in diff view\n"
380 " -n[I], --line-number[=I] Show line numbers with given interval\n"
381 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
382 " -- Mark end of tig options\n"
383 " -v, --version Show version and exit\n"
384 " -h, --help Show help message and exit\n";
385
386 /* Option and state variables. */
387 static bool opt_line_number = FALSE;
388 static bool opt_rev_graph = TRUE;
389 static int opt_num_interval = NUMBER_INTERVAL;
390 static int opt_tab_size = TABSIZE;
391 static enum request opt_request = REQ_VIEW_MAIN;
392 static char opt_cmd[SIZEOF_STR] = "";
393 static char opt_path[SIZEOF_STR] = "";
394 static FILE *opt_pipe = NULL;
395 static char opt_encoding[20] = "UTF-8";
396 static bool opt_utf8 = TRUE;
397 static char opt_codeset[20] = "UTF-8";
398 static iconv_t opt_iconv = ICONV_NONE;
399 static char opt_search[SIZEOF_STR] = "";
400
401 enum option_type {
402 OPT_NONE,
403 OPT_INT,
404 };
405
406 static bool
407 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
408 {
409 va_list args;
410 char *value = "";
411 int *number;
412
413 if (opt[0] != '-')
414 return FALSE;
415
416 if (opt[1] == '-') {
417 int namelen = strlen(name);
418
419 opt += 2;
420
421 if (strncmp(opt, name, namelen))
422 return FALSE;
423
424 if (opt[namelen] == '=')
425 value = opt + namelen + 1;
426
427 } else {
428 if (!short_name || opt[1] != short_name)
429 return FALSE;
430 value = opt + 2;
431 }
432
433 va_start(args, type);
434 if (type == OPT_INT) {
435 number = va_arg(args, int *);
436 if (isdigit(*value))
437 *number = atoi(value);
438 }
439 va_end(args);
440
441 return TRUE;
442 }
443
444 /* Returns the index of log or diff command or -1 to exit. */
445 static bool
446 parse_options(int argc, char *argv[])
447 {
448 int i;
449
450 for (i = 1; i < argc; i++) {
451 char *opt = argv[i];
452
453 if (!strcmp(opt, "-l")) {
454 opt_request = REQ_VIEW_LOG;
455 continue;
456 }
457
458 if (!strcmp(opt, "-d")) {
459 opt_request = REQ_VIEW_DIFF;
460 continue;
461 }
462
463 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
464 opt_line_number = TRUE;
465 continue;
466 }
467
468 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
469 opt_tab_size = MIN(opt_tab_size, TABSIZE);
470 continue;
471 }
472
473 if (check_option(opt, 'v', "version", OPT_NONE)) {
474 printf("tig version %s\n", VERSION);
475 return FALSE;
476 }
477
478 if (check_option(opt, 'h', "help", OPT_NONE)) {
479 printf(usage);
480 return FALSE;
481 }
482
483 if (!strcmp(opt, "--")) {
484 i++;
485 break;
486 }
487
488 if (!strcmp(opt, "log") ||
489 !strcmp(opt, "diff") ||
490 !strcmp(opt, "show")) {
491 opt_request = opt[0] == 'l'
492 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
493 break;
494 }
495
496 if (opt[0] && opt[0] != '-')
497 break;
498
499 die("unknown option '%s'\n\n%s", opt, usage);
500 }
501
502 if (!isatty(STDIN_FILENO)) {
503 opt_request = REQ_VIEW_PAGER;
504 opt_pipe = stdin;
505
506 } else if (i < argc) {
507 size_t buf_size;
508
509 if (opt_request == REQ_VIEW_MAIN)
510 /* XXX: This is vulnerable to the user overriding
511 * options required for the main view parser. */
512 string_copy(opt_cmd, "git log --stat --pretty=raw");
513 else
514 string_copy(opt_cmd, "git");
515 buf_size = strlen(opt_cmd);
516
517 while (buf_size < sizeof(opt_cmd) && i < argc) {
518 opt_cmd[buf_size++] = ' ';
519 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
520 }
521
522 if (buf_size >= sizeof(opt_cmd))
523 die("command too long");
524
525 opt_cmd[buf_size] = 0;
526
527 }
528
529 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
530 opt_utf8 = FALSE;
531
532 return TRUE;
533 }
534
535
536 /*
537 * Line-oriented content detection.
538 */
539
540 #define LINE_INFO \
541 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
542 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
543 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
544 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
545 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
546 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
547 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
548 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
549 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
550 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
551 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
552 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
553 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
554 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
555 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
556 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
557 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
558 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
559 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
560 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
561 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
562 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
563 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
564 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
565 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
566 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
567 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
568 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
569 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
570 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
571 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
572 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
573 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
574 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
575 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
576 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
577 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
578 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
579 LINE(TREE_DIR, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
580 LINE(TREE_FILE, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL)
581
582 enum line_type {
583 #define LINE(type, line, fg, bg, attr) \
584 LINE_##type
585 LINE_INFO
586 #undef LINE
587 };
588
589 struct line_info {
590 const char *name; /* Option name. */
591 int namelen; /* Size of option name. */
592 const char *line; /* The start of line to match. */
593 int linelen; /* Size of string to match. */
594 int fg, bg, attr; /* Color and text attributes for the lines. */
595 };
596
597 static struct line_info line_info[] = {
598 #define LINE(type, line, fg, bg, attr) \
599 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
600 LINE_INFO
601 #undef LINE
602 };
603
604 static enum line_type
605 get_line_type(char *line)
606 {
607 int linelen = strlen(line);
608 enum line_type type;
609
610 for (type = 0; type < ARRAY_SIZE(line_info); type++)
611 /* Case insensitive search matches Signed-off-by lines better. */
612 if (linelen >= line_info[type].linelen &&
613 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
614 return type;
615
616 return LINE_DEFAULT;
617 }
618
619 static inline int
620 get_line_attr(enum line_type type)
621 {
622 assert(type < ARRAY_SIZE(line_info));
623 return COLOR_PAIR(type) | line_info[type].attr;
624 }
625
626 static struct line_info *
627 get_line_info(char *name, int namelen)
628 {
629 enum line_type type;
630
631 for (type = 0; type < ARRAY_SIZE(line_info); type++)
632 if (namelen == line_info[type].namelen &&
633 !string_enum_compare(line_info[type].name, name, namelen))
634 return &line_info[type];
635
636 return NULL;
637 }
638
639 static void
640 init_colors(void)
641 {
642 int default_bg = COLOR_BLACK;
643 int default_fg = COLOR_WHITE;
644 enum line_type type;
645
646 start_color();
647
648 if (use_default_colors() != ERR) {
649 default_bg = -1;
650 default_fg = -1;
651 }
652
653 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
654 struct line_info *info = &line_info[type];
655 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
656 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
657
658 init_pair(type, fg, bg);
659 }
660 }
661
662 struct line {
663 enum line_type type;
664 void *data; /* User data */
665 };
666
667
668 /*
669 * Keys
670 */
671
672 struct keybinding {
673 int alias;
674 enum request request;
675 struct keybinding *next;
676 };
677
678 static struct keybinding default_keybindings[] = {
679 /* View switching */
680 { 'm', REQ_VIEW_MAIN },
681 { 'd', REQ_VIEW_DIFF },
682 { 'l', REQ_VIEW_LOG },
683 { 't', REQ_VIEW_TREE },
684 { 'f', REQ_VIEW_BLOB },
685 { 'p', REQ_VIEW_PAGER },
686 { 'h', REQ_VIEW_HELP },
687
688 /* View manipulation */
689 { 'q', REQ_VIEW_CLOSE },
690 { KEY_TAB, REQ_VIEW_NEXT },
691 { KEY_RETURN, REQ_ENTER },
692 { KEY_UP, REQ_PREVIOUS },
693 { KEY_DOWN, REQ_NEXT },
694
695 /* Cursor navigation */
696 { 'k', REQ_MOVE_UP },
697 { 'j', REQ_MOVE_DOWN },
698 { KEY_HOME, REQ_MOVE_FIRST_LINE },
699 { KEY_END, REQ_MOVE_LAST_LINE },
700 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
701 { ' ', REQ_MOVE_PAGE_DOWN },
702 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
703 { 'b', REQ_MOVE_PAGE_UP },
704 { '-', REQ_MOVE_PAGE_UP },
705
706 /* Scrolling */
707 { KEY_IC, REQ_SCROLL_LINE_UP },
708 { KEY_DC, REQ_SCROLL_LINE_DOWN },
709 { 'w', REQ_SCROLL_PAGE_UP },
710 { 's', REQ_SCROLL_PAGE_DOWN },
711
712 /* Searching */
713 { '/', REQ_SEARCH },
714 { '?', REQ_SEARCH_BACK },
715 { 'n', REQ_FIND_NEXT },
716 { 'N', REQ_FIND_PREV },
717
718 /* Misc */
719 { 'Q', REQ_QUIT },
720 { 'z', REQ_STOP_LOADING },
721 { 'v', REQ_SHOW_VERSION },
722 { 'r', REQ_SCREEN_REDRAW },
723 { '.', REQ_TOGGLE_LINENO },
724 { 'g', REQ_TOGGLE_REV_GRAPH },
725 { ':', REQ_PROMPT },
726
727 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
728 { ERR, REQ_NONE },
729
730 /* Using the ncurses SIGWINCH handler. */
731 { KEY_RESIZE, REQ_SCREEN_RESIZE },
732 };
733
734 #define KEYMAP_INFO \
735 KEYMAP_(GENERIC), \
736 KEYMAP_(MAIN), \
737 KEYMAP_(DIFF), \
738 KEYMAP_(LOG), \
739 KEYMAP_(TREE), \
740 KEYMAP_(BLOB), \
741 KEYMAP_(PAGER), \
742 KEYMAP_(HELP) \
743
744 enum keymap {
745 #define KEYMAP_(name) KEYMAP_##name
746 KEYMAP_INFO
747 #undef KEYMAP_
748 };
749
750 static struct int_map keymap_table[] = {
751 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
752 KEYMAP_INFO
753 #undef KEYMAP_
754 };
755
756 #define set_keymap(map, name) \
757 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
758
759 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
760
761 static void
762 add_keybinding(enum keymap keymap, enum request request, int key)
763 {
764 struct keybinding *keybinding;
765
766 keybinding = calloc(1, sizeof(*keybinding));
767 if (!keybinding)
768 die("Failed to allocate keybinding");
769
770 keybinding->alias = key;
771 keybinding->request = request;
772 keybinding->next = keybindings[keymap];
773 keybindings[keymap] = keybinding;
774 }
775
776 /* Looks for a key binding first in the given map, then in the generic map, and
777 * lastly in the default keybindings. */
778 static enum request
779 get_keybinding(enum keymap keymap, int key)
780 {
781 struct keybinding *kbd;
782 int i;
783
784 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
785 if (kbd->alias == key)
786 return kbd->request;
787
788 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
789 if (kbd->alias == key)
790 return kbd->request;
791
792 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
793 if (default_keybindings[i].alias == key)
794 return default_keybindings[i].request;
795
796 return (enum request) key;
797 }
798
799
800 struct key {
801 char *name;
802 int value;
803 };
804
805 static struct key key_table[] = {
806 { "Enter", KEY_RETURN },
807 { "Space", ' ' },
808 { "Backspace", KEY_BACKSPACE },
809 { "Tab", KEY_TAB },
810 { "Escape", KEY_ESC },
811 { "Left", KEY_LEFT },
812 { "Right", KEY_RIGHT },
813 { "Up", KEY_UP },
814 { "Down", KEY_DOWN },
815 { "Insert", KEY_IC },
816 { "Delete", KEY_DC },
817 { "Hash", '#' },
818 { "Home", KEY_HOME },
819 { "End", KEY_END },
820 { "PageUp", KEY_PPAGE },
821 { "PageDown", KEY_NPAGE },
822 { "F1", KEY_F(1) },
823 { "F2", KEY_F(2) },
824 { "F3", KEY_F(3) },
825 { "F4", KEY_F(4) },
826 { "F5", KEY_F(5) },
827 { "F6", KEY_F(6) },
828 { "F7", KEY_F(7) },
829 { "F8", KEY_F(8) },
830 { "F9", KEY_F(9) },
831 { "F10", KEY_F(10) },
832 { "F11", KEY_F(11) },
833 { "F12", KEY_F(12) },
834 };
835
836 static int
837 get_key_value(const char *name)
838 {
839 int i;
840
841 for (i = 0; i < ARRAY_SIZE(key_table); i++)
842 if (!strcasecmp(key_table[i].name, name))
843 return key_table[i].value;
844
845 if (strlen(name) == 1 && isprint(*name))
846 return (int) *name;
847
848 return ERR;
849 }
850
851 static char *
852 get_key(enum request request)
853 {
854 static char buf[BUFSIZ];
855 static char key_char[] = "'X'";
856 size_t pos = 0;
857 char *sep = " ";
858 int i;
859
860 buf[pos] = 0;
861
862 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
863 struct keybinding *keybinding = &default_keybindings[i];
864 char *seq = NULL;
865 int key;
866
867 if (keybinding->request != request)
868 continue;
869
870 for (key = 0; key < ARRAY_SIZE(key_table); key++)
871 if (key_table[key].value == keybinding->alias)
872 seq = key_table[key].name;
873
874 if (seq == NULL &&
875 keybinding->alias < 127 &&
876 isprint(keybinding->alias)) {
877 key_char[1] = (char) keybinding->alias;
878 seq = key_char;
879 }
880
881 if (!seq)
882 seq = "'?'";
883
884 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
885 return "Too many keybindings!";
886 sep = ", ";
887 }
888
889 return buf;
890 }
891
892
893 /*
894 * User config file handling.
895 */
896
897 static struct int_map color_map[] = {
898 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
899 COLOR_MAP(DEFAULT),
900 COLOR_MAP(BLACK),
901 COLOR_MAP(BLUE),
902 COLOR_MAP(CYAN),
903 COLOR_MAP(GREEN),
904 COLOR_MAP(MAGENTA),
905 COLOR_MAP(RED),
906 COLOR_MAP(WHITE),
907 COLOR_MAP(YELLOW),
908 };
909
910 #define set_color(color, name) \
911 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
912
913 static struct int_map attr_map[] = {
914 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
915 ATTR_MAP(NORMAL),
916 ATTR_MAP(BLINK),
917 ATTR_MAP(BOLD),
918 ATTR_MAP(DIM),
919 ATTR_MAP(REVERSE),
920 ATTR_MAP(STANDOUT),
921 ATTR_MAP(UNDERLINE),
922 };
923
924 #define set_attribute(attr, name) \
925 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
926
927 static int config_lineno;
928 static bool config_errors;
929 static char *config_msg;
930
931 /* Wants: object fgcolor bgcolor [attr] */
932 static int
933 option_color_command(int argc, char *argv[])
934 {
935 struct line_info *info;
936
937 if (argc != 3 && argc != 4) {
938 config_msg = "Wrong number of arguments given to color command";
939 return ERR;
940 }
941
942 info = get_line_info(argv[0], strlen(argv[0]));
943 if (!info) {
944 config_msg = "Unknown color name";
945 return ERR;
946 }
947
948 if (set_color(&info->fg, argv[1]) == ERR ||
949 set_color(&info->bg, argv[2]) == ERR) {
950 config_msg = "Unknown color";
951 return ERR;
952 }
953
954 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
955 config_msg = "Unknown attribute";
956 return ERR;
957 }
958
959 return OK;
960 }
961
962 /* Wants: name = value */
963 static int
964 option_set_command(int argc, char *argv[])
965 {
966 if (argc != 3) {
967 config_msg = "Wrong number of arguments given to set command";
968 return ERR;
969 }
970
971 if (strcmp(argv[1], "=")) {
972 config_msg = "No value assigned";
973 return ERR;
974 }
975
976 if (!strcmp(argv[0], "show-rev-graph")) {
977 opt_rev_graph = (!strcmp(argv[2], "1") ||
978 !strcmp(argv[2], "true") ||
979 !strcmp(argv[2], "yes"));
980 return OK;
981 }
982
983 if (!strcmp(argv[0], "line-number-interval")) {
984 opt_num_interval = atoi(argv[2]);
985 return OK;
986 }
987
988 if (!strcmp(argv[0], "tab-size")) {
989 opt_tab_size = atoi(argv[2]);
990 return OK;
991 }
992
993 if (!strcmp(argv[0], "commit-encoding")) {
994 char *arg = argv[2];
995 int delimiter = *arg;
996 int i;
997
998 switch (delimiter) {
999 case '"':
1000 case '\'':
1001 for (arg++, i = 0; arg[i]; i++)
1002 if (arg[i] == delimiter) {
1003 arg[i] = 0;
1004 break;
1005 }
1006 default:
1007 string_copy(opt_encoding, arg);
1008 return OK;
1009 }
1010 }
1011
1012 config_msg = "Unknown variable name";
1013 return ERR;
1014 }
1015
1016 /* Wants: mode request key */
1017 static int
1018 option_bind_command(int argc, char *argv[])
1019 {
1020 enum request request;
1021 int keymap;
1022 int key;
1023
1024 if (argc != 3) {
1025 config_msg = "Wrong number of arguments given to bind command";
1026 return ERR;
1027 }
1028
1029 if (set_keymap(&keymap, argv[0]) == ERR) {
1030 config_msg = "Unknown key map";
1031 return ERR;
1032 }
1033
1034 key = get_key_value(argv[1]);
1035 if (key == ERR) {
1036 config_msg = "Unknown key";
1037 return ERR;
1038 }
1039
1040 request = get_request(argv[2]);
1041 if (request == REQ_UNKNOWN) {
1042 config_msg = "Unknown request name";
1043 return ERR;
1044 }
1045
1046 add_keybinding(keymap, request, key);
1047
1048 return OK;
1049 }
1050
1051 static int
1052 set_option(char *opt, char *value)
1053 {
1054 char *argv[16];
1055 int valuelen;
1056 int argc = 0;
1057
1058 /* Tokenize */
1059 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1060 argv[argc++] = value;
1061
1062 value += valuelen;
1063 if (!*value)
1064 break;
1065
1066 *value++ = 0;
1067 while (isspace(*value))
1068 value++;
1069 }
1070
1071 if (!strcmp(opt, "color"))
1072 return option_color_command(argc, argv);
1073
1074 if (!strcmp(opt, "set"))
1075 return option_set_command(argc, argv);
1076
1077 if (!strcmp(opt, "bind"))
1078 return option_bind_command(argc, argv);
1079
1080 config_msg = "Unknown option command";
1081 return ERR;
1082 }
1083
1084 static int
1085 read_option(char *opt, int optlen, char *value, int valuelen)
1086 {
1087 int status = OK;
1088
1089 config_lineno++;
1090 config_msg = "Internal error";
1091
1092 /* Check for comment markers, since read_properties() will
1093 * only ensure opt and value are split at first " \t". */
1094 optlen = strcspn(opt, "#");
1095 if (optlen == 0)
1096 return OK;
1097
1098 if (opt[optlen] != 0) {
1099 config_msg = "No option value";
1100 status = ERR;
1101
1102 } else {
1103 /* Look for comment endings in the value. */
1104 int len = strcspn(value, "#");
1105
1106 if (len < valuelen) {
1107 valuelen = len;
1108 value[valuelen] = 0;
1109 }
1110
1111 status = set_option(opt, value);
1112 }
1113
1114 if (status == ERR) {
1115 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1116 config_lineno, optlen, opt, config_msg);
1117 config_errors = TRUE;
1118 }
1119
1120 /* Always keep going if errors are encountered. */
1121 return OK;
1122 }
1123
1124 static int
1125 load_options(void)
1126 {
1127 char *home = getenv("HOME");
1128 char buf[SIZEOF_STR];
1129 FILE *file;
1130
1131 config_lineno = 0;
1132 config_errors = FALSE;
1133
1134 if (!home || !string_format(buf, "%s/.tigrc", home))
1135 return ERR;
1136
1137 /* It's ok that the file doesn't exist. */
1138 file = fopen(buf, "r");
1139 if (!file)
1140 return OK;
1141
1142 if (read_properties(file, " \t", read_option) == ERR ||
1143 config_errors == TRUE)
1144 fprintf(stderr, "Errors while loading %s.\n", buf);
1145
1146 return OK;
1147 }
1148
1149
1150 /*
1151 * The viewer
1152 */
1153
1154 struct view;
1155 struct view_ops;
1156
1157 /* The display array of active views and the index of the current view. */
1158 static struct view *display[2];
1159 static unsigned int current_view;
1160
1161 #define foreach_displayed_view(view, i) \
1162 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1163
1164 #define displayed_views() (display[1] != NULL ? 2 : 1)
1165
1166 /* Current head and commit ID */
1167 static char ref_blob[SIZEOF_REF] = "";
1168 static char ref_commit[SIZEOF_REF] = "HEAD";
1169 static char ref_head[SIZEOF_REF] = "HEAD";
1170
1171 struct view {
1172 const char *name; /* View name */
1173 const char *cmd_fmt; /* Default command line format */
1174 const char *cmd_env; /* Command line set via environment */
1175 const char *id; /* Points to either of ref_{head,commit,blob} */
1176
1177 struct view_ops *ops; /* View operations */
1178
1179 enum keymap keymap; /* What keymap does this view have */
1180
1181 char cmd[SIZEOF_STR]; /* Command buffer */
1182 char ref[SIZEOF_REF]; /* Hovered commit reference */
1183 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
1184
1185 int height, width; /* The width and height of the main window */
1186 WINDOW *win; /* The main window */
1187 WINDOW *title; /* The title window living below the main window */
1188
1189 /* Navigation */
1190 unsigned long offset; /* Offset of the window top */
1191 unsigned long lineno; /* Current line number */
1192
1193 /* Searching */
1194 char grep[SIZEOF_STR]; /* Search string */
1195 regex_t *regex; /* Pre-compiled regex */
1196
1197 /* If non-NULL, points to the view that opened this view. If this view
1198 * is closed tig will switch back to the parent view. */
1199 struct view *parent;
1200
1201 /* Buffering */
1202 unsigned long lines; /* Total number of lines */
1203 struct line *line; /* Line index */
1204 unsigned long line_size;/* Total number of allocated lines */
1205 unsigned int digits; /* Number of digits in the lines member. */
1206
1207 /* Loading */
1208 FILE *pipe;
1209 time_t start_time;
1210 };
1211
1212 struct view_ops {
1213 /* What type of content being displayed. Used in the title bar. */
1214 const char *type;
1215 /* Draw one line; @lineno must be < view->height. */
1216 bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
1217 /* Read one line; updates view->line. */
1218 bool (*read)(struct view *view, char *data);
1219 /* Depending on view, change display based on current line. */
1220 bool (*enter)(struct view *view, struct line *line);
1221 /* Search for regex in a line. */
1222 bool (*grep)(struct view *view, struct line *line);
1223 /* Select line */
1224 void (*select)(struct view *view, struct line *line);
1225 };
1226
1227 static struct view_ops pager_ops;
1228 static struct view_ops main_ops;
1229 static struct view_ops tree_ops;
1230 static struct view_ops blob_ops;
1231
1232 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1233 { name, cmd, #env, ref, ops, map}
1234
1235 #define VIEW_(id, name, ops, ref) \
1236 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1237
1238
1239 static struct view views[] = {
1240 VIEW_(MAIN, "main", &main_ops, ref_head),
1241 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1242 VIEW_(LOG, "log", &pager_ops, ref_head),
1243 VIEW_(TREE, "tree", &tree_ops, ref_commit),
1244 VIEW_(BLOB, "blob", &blob_ops, ref_blob),
1245 VIEW_(HELP, "help", &pager_ops, "static"),
1246 VIEW_(PAGER, "pager", &pager_ops, "static"),
1247 };
1248
1249 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1250
1251 #define foreach_view(view, i) \
1252 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1253
1254 #define view_is_displayed(view) \
1255 (view == display[0] || view == display[1])
1256
1257 static bool
1258 draw_view_line(struct view *view, unsigned int lineno)
1259 {
1260 struct line *line;
1261 bool selected = (view->offset + lineno == view->lineno);
1262
1263 assert(view_is_displayed(view));
1264
1265 if (view->offset + lineno >= view->lines)
1266 return FALSE;
1267
1268 line = &view->line[view->offset + lineno];
1269
1270 if (selected)
1271 view->ops->select(view, line);
1272
1273 return view->ops->draw(view, line, lineno, selected);
1274 }
1275
1276 static void
1277 redraw_view_from(struct view *view, int lineno)
1278 {
1279 assert(0 <= lineno && lineno < view->height);
1280
1281 for (; lineno < view->height; lineno++) {
1282 if (!draw_view_line(view, lineno))
1283 break;
1284 }
1285
1286 redrawwin(view->win);
1287 wrefresh(view->win);
1288 }
1289
1290 static void
1291 redraw_view(struct view *view)
1292 {
1293 wclear(view->win);
1294 redraw_view_from(view, 0);
1295 }
1296
1297
1298 static void
1299 update_view_title(struct view *view)
1300 {
1301 assert(view_is_displayed(view));
1302
1303 if (view == display[current_view])
1304 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1305 else
1306 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1307
1308 werase(view->title);
1309 wmove(view->title, 0, 0);
1310
1311 if (*view->ref)
1312 wprintw(view->title, "[%s] %s", view->name, view->ref);
1313 else
1314 wprintw(view->title, "[%s]", view->name);
1315
1316 if (view->lines || view->pipe) {
1317 unsigned int view_lines = view->offset + view->height;
1318 unsigned int lines = view->lines
1319 ? MIN(view_lines, view->lines) * 100 / view->lines
1320 : 0;
1321
1322 wprintw(view->title, " - %s %d of %d (%d%%)",
1323 view->ops->type,
1324 view->lineno + 1,
1325 view->lines,
1326 lines);
1327 }
1328
1329 if (view->pipe) {
1330 time_t secs = time(NULL) - view->start_time;
1331
1332 /* Three git seconds are a long time ... */
1333 if (secs > 2)
1334 wprintw(view->title, " %lds", secs);
1335 }
1336
1337 wmove(view->title, 0, view->width - 1);
1338 wrefresh(view->title);
1339 }
1340
1341 static void
1342 resize_display(void)
1343 {
1344 int offset, i;
1345 struct view *base = display[0];
1346 struct view *view = display[1] ? display[1] : display[0];
1347
1348 /* Setup window dimensions */
1349
1350 getmaxyx(stdscr, base->height, base->width);
1351
1352 /* Make room for the status window. */
1353 base->height -= 1;
1354
1355 if (view != base) {
1356 /* Horizontal split. */
1357 view->width = base->width;
1358 view->height = SCALE_SPLIT_VIEW(base->height);
1359 base->height -= view->height;
1360
1361 /* Make room for the title bar. */
1362 view->height -= 1;
1363 }
1364
1365 /* Make room for the title bar. */
1366 base->height -= 1;
1367
1368 offset = 0;
1369
1370 foreach_displayed_view (view, i) {
1371 if (!view->win) {
1372 view->win = newwin(view->height, 0, offset, 0);
1373 if (!view->win)
1374 die("Failed to create %s view", view->name);
1375
1376 scrollok(view->win, TRUE);
1377
1378 view->title = newwin(1, 0, offset + view->height, 0);
1379 if (!view->title)
1380 die("Failed to create title window");
1381
1382 } else {
1383 wresize(view->win, view->height, view->width);
1384 mvwin(view->win, offset, 0);
1385 mvwin(view->title, offset + view->height, 0);
1386 }
1387
1388 offset += view->height + 1;
1389 }
1390 }
1391
1392 static void
1393 redraw_display(void)
1394 {
1395 struct view *view;
1396 int i;
1397
1398 foreach_displayed_view (view, i) {
1399 redraw_view(view);
1400 update_view_title(view);
1401 }
1402 }
1403
1404 static void
1405 update_display_cursor(void)
1406 {
1407 struct view *view = display[current_view];
1408
1409 /* Move the cursor to the right-most column of the cursor line.
1410 *
1411 * XXX: This could turn out to be a bit expensive, but it ensures that
1412 * the cursor does not jump around. */
1413 if (view->lines) {
1414 wmove(view->win, view->lineno - view->offset, view->width - 1);
1415 wrefresh(view->win);
1416 }
1417 }
1418
1419 /*
1420 * Navigation
1421 */
1422
1423 /* Scrolling backend */
1424 static void
1425 do_scroll_view(struct view *view, int lines, bool redraw)
1426 {
1427 assert(view_is_displayed(view));
1428
1429 /* The rendering expects the new offset. */
1430 view->offset += lines;
1431
1432 assert(0 <= view->offset && view->offset < view->lines);
1433 assert(lines);
1434
1435 /* Redraw the whole screen if scrolling is pointless. */
1436 if (view->height < ABS(lines)) {
1437 redraw_view(view);
1438
1439 } else {
1440 int line = lines > 0 ? view->height - lines : 0;
1441 int end = line + ABS(lines);
1442
1443 wscrl(view->win, lines);
1444
1445 for (; line < end; line++) {
1446 if (!draw_view_line(view, line))
1447 break;
1448 }
1449 }
1450
1451 /* Move current line into the view. */
1452 if (view->lineno < view->offset) {
1453 view->lineno = view->offset;
1454 draw_view_line(view, 0);
1455
1456 } else if (view->lineno >= view->offset + view->height) {
1457 if (view->lineno == view->offset + view->height) {
1458 /* Clear the hidden line so it doesn't show if the view
1459 * is scrolled up. */
1460 wmove(view->win, view->height, 0);
1461 wclrtoeol(view->win);
1462 }
1463 view->lineno = view->offset + view->height - 1;
1464 draw_view_line(view, view->lineno - view->offset);
1465 }
1466
1467 assert(view->offset <= view->lineno && view->lineno < view->lines);
1468
1469 if (!redraw)
1470 return;
1471
1472 redrawwin(view->win);
1473 wrefresh(view->win);
1474 report("");
1475 }
1476
1477 /* Scroll frontend */
1478 static void
1479 scroll_view(struct view *view, enum request request)
1480 {
1481 int lines = 1;
1482
1483 switch (request) {
1484 case REQ_SCROLL_PAGE_DOWN:
1485 lines = view->height;
1486 case REQ_SCROLL_LINE_DOWN:
1487 if (view->offset + lines > view->lines)
1488 lines = view->lines - view->offset;
1489
1490 if (lines == 0 || view->offset + view->height >= view->lines) {
1491 report("Cannot scroll beyond the last line");
1492 return;
1493 }
1494 break;
1495
1496 case REQ_SCROLL_PAGE_UP:
1497 lines = view->height;
1498 case REQ_SCROLL_LINE_UP:
1499 if (lines > view->offset)
1500 lines = view->offset;
1501
1502 if (lines == 0) {
1503 report("Cannot scroll beyond the first line");
1504 return;
1505 }
1506
1507 lines = -lines;
1508 break;
1509
1510 default:
1511 die("request %d not handled in switch", request);
1512 }
1513
1514 do_scroll_view(view, lines, TRUE);
1515 }
1516
1517 /* Cursor moving */
1518 static void
1519 move_view(struct view *view, enum request request, bool redraw)
1520 {
1521 int steps;
1522
1523 switch (request) {
1524 case REQ_MOVE_FIRST_LINE:
1525 steps = -view->lineno;
1526 break;
1527
1528 case REQ_MOVE_LAST_LINE:
1529 steps = view->lines - view->lineno - 1;
1530 break;
1531
1532 case REQ_MOVE_PAGE_UP:
1533 steps = view->height > view->lineno
1534 ? -view->lineno : -view->height;
1535 break;
1536
1537 case REQ_MOVE_PAGE_DOWN:
1538 steps = view->lineno + view->height >= view->lines
1539 ? view->lines - view->lineno - 1 : view->height;
1540 break;
1541
1542 case REQ_MOVE_UP:
1543 steps = -1;
1544 break;
1545
1546 case REQ_MOVE_DOWN:
1547 steps = 1;
1548 break;
1549
1550 default:
1551 die("request %d not handled in switch", request);
1552 }
1553
1554 if (steps <= 0 && view->lineno == 0) {
1555 report("Cannot move beyond the first line");
1556 return;
1557
1558 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1559 report("Cannot move beyond the last line");
1560 return;
1561 }
1562
1563 /* Move the current line */
1564 view->lineno += steps;
1565 assert(0 <= view->lineno && view->lineno < view->lines);
1566
1567 /* Repaint the old "current" line if we be scrolling */
1568 if (ABS(steps) < view->height) {
1569 int prev_lineno = view->lineno - steps - view->offset;
1570
1571 wmove(view->win, prev_lineno, 0);
1572 wclrtoeol(view->win);
1573 draw_view_line(view, prev_lineno);
1574 }
1575
1576 /* Check whether the view needs to be scrolled */
1577 if (view->lineno < view->offset ||
1578 view->lineno >= view->offset + view->height) {
1579 if (steps < 0 && -steps > view->offset) {
1580 steps = -view->offset;
1581
1582 } else if (steps > 0) {
1583 if (view->lineno == view->lines - 1 &&
1584 view->lines > view->height) {
1585 steps = view->lines - view->offset - 1;
1586 if (steps >= view->height)
1587 steps -= view->height - 1;
1588 }
1589 }
1590
1591 do_scroll_view(view, steps, redraw);
1592 return;
1593 }
1594
1595 /* Draw the current line */
1596 draw_view_line(view, view->lineno - view->offset);
1597
1598 if (!redraw)
1599 return;
1600
1601 redrawwin(view->win);
1602 wrefresh(view->win);
1603 report("");
1604 }
1605
1606
1607 /*
1608 * Searching
1609 */
1610
1611 static void search_view(struct view *view, enum request request, const char *search);
1612
1613 static bool
1614 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1615 {
1616 assert(view_is_displayed(view));
1617
1618 if (!view->ops->grep(view, line))
1619 return FALSE;
1620
1621 if (lineno - view->offset >= view->height) {
1622 view->offset = lineno;
1623 view->lineno = lineno;
1624 redraw_view(view);
1625
1626 } else {
1627 unsigned long old_lineno = view->lineno - view->offset;
1628
1629 view->lineno = lineno;
1630
1631 wmove(view->win, old_lineno, 0);
1632 wclrtoeol(view->win);
1633 draw_view_line(view, old_lineno);
1634
1635 draw_view_line(view, view->lineno - view->offset);
1636 redrawwin(view->win);
1637 wrefresh(view->win);
1638 }
1639
1640 report("Line %ld matches '%s'", lineno + 1, view->grep);
1641 return TRUE;
1642 }
1643
1644 static void
1645 find_next(struct view *view, enum request request)
1646 {
1647 unsigned long lineno = view->lineno;
1648 int direction;
1649
1650 if (!*view->grep) {
1651 if (!*opt_search)
1652 report("No previous search");
1653 else
1654 search_view(view, request, opt_search);
1655 return;
1656 }
1657
1658 switch (request) {
1659 case REQ_SEARCH:
1660 case REQ_FIND_NEXT:
1661 direction = 1;
1662 break;
1663
1664 case REQ_SEARCH_BACK:
1665 case REQ_FIND_PREV:
1666 direction = -1;
1667 break;
1668
1669 default:
1670 return;
1671 }
1672
1673 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1674 lineno += direction;
1675
1676 /* Note, lineno is unsigned long so will wrap around in which case it
1677 * will become bigger than view->lines. */
1678 for (; lineno < view->lines; lineno += direction) {
1679 struct line *line = &view->line[lineno];
1680
1681 if (find_next_line(view, lineno, line))
1682 return;
1683 }
1684
1685 report("No match found for '%s'", view->grep);
1686 }
1687
1688 static void
1689 search_view(struct view *view, enum request request, const char *search)
1690 {
1691 int regex_err;
1692
1693 if (view->regex) {
1694 regfree(view->regex);
1695 *view->grep = 0;
1696 } else {
1697 view->regex = calloc(1, sizeof(*view->regex));
1698 if (!view->regex)
1699 return;
1700 }
1701
1702 regex_err = regcomp(view->regex, search, REG_EXTENDED);
1703 if (regex_err != 0) {
1704 char buf[SIZEOF_STR] = "unknown error";
1705
1706 regerror(regex_err, view->regex, buf, sizeof(buf));
1707 report("Search failed: %s", buf);
1708 return;
1709 }
1710
1711 string_copy(view->grep, search);
1712
1713 find_next(view, request);
1714 }
1715
1716 /*
1717 * Incremental updating
1718 */
1719
1720 static void
1721 end_update(struct view *view)
1722 {
1723 if (!view->pipe)
1724 return;
1725 set_nonblocking_input(FALSE);
1726 if (view->pipe == stdin)
1727 fclose(view->pipe);
1728 else
1729 pclose(view->pipe);
1730 view->pipe = NULL;
1731 }
1732
1733 static bool
1734 begin_update(struct view *view)
1735 {
1736 const char *id = view->id;
1737
1738 if (view->pipe)
1739 end_update(view);
1740
1741 if (opt_cmd[0]) {
1742 string_copy(view->cmd, opt_cmd);
1743 opt_cmd[0] = 0;
1744 /* When running random commands, the view ref could have become
1745 * invalid so clear it. */
1746 view->ref[0] = 0;
1747
1748 } else if (view == VIEW(REQ_VIEW_TREE)) {
1749 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1750
1751 if (strcmp(view->vid, view->id))
1752 opt_path[0] = 0;
1753
1754 if (!string_format(view->cmd, format, id, opt_path))
1755 return FALSE;
1756
1757 } else {
1758 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1759
1760 if (!string_format(view->cmd, format, id, id, id, id, id))
1761 return FALSE;
1762 }
1763
1764 /* Special case for the pager view. */
1765 if (opt_pipe) {
1766 view->pipe = opt_pipe;
1767 opt_pipe = NULL;
1768 } else {
1769 view->pipe = popen(view->cmd, "r");
1770 }
1771
1772 if (!view->pipe)
1773 return FALSE;
1774
1775 set_nonblocking_input(TRUE);
1776
1777 view->offset = 0;
1778 view->lines = 0;
1779 view->lineno = 0;
1780 string_copy(view->vid, id);
1781
1782 if (view->line) {
1783 int i;
1784
1785 for (i = 0; i < view->lines; i++)
1786 if (view->line[i].data)
1787 free(view->line[i].data);
1788
1789 free(view->line);
1790 view->line = NULL;
1791 }
1792
1793 view->start_time = time(NULL);
1794
1795 return TRUE;
1796 }
1797
1798 static struct line *
1799 realloc_lines(struct view *view, size_t line_size)
1800 {
1801 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1802
1803 if (!tmp)
1804 return NULL;
1805
1806 view->line = tmp;
1807 view->line_size = line_size;
1808 return view->line;
1809 }
1810
1811 static bool
1812 update_view(struct view *view)
1813 {
1814 char in_buffer[BUFSIZ];
1815 char out_buffer[BUFSIZ * 2];
1816 char *line;
1817 /* The number of lines to read. If too low it will cause too much
1818 * redrawing (and possible flickering), if too high responsiveness
1819 * will suffer. */
1820 unsigned long lines = view->height;
1821 int redraw_from = -1;
1822
1823 if (!view->pipe)
1824 return TRUE;
1825
1826 /* Only redraw if lines are visible. */
1827 if (view->offset + view->height >= view->lines)
1828 redraw_from = view->lines - view->offset;
1829
1830 /* FIXME: This is probably not perfect for backgrounded views. */
1831 if (!realloc_lines(view, view->lines + lines))
1832 goto alloc_error;
1833
1834 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1835 size_t linelen = strlen(line);
1836
1837 if (linelen)
1838 line[linelen - 1] = 0;
1839
1840 if (opt_iconv != ICONV_NONE) {
1841 char *inbuf = line;
1842 size_t inlen = linelen;
1843
1844 char *outbuf = out_buffer;
1845 size_t outlen = sizeof(out_buffer);
1846
1847 size_t ret;
1848
1849 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1850 if (ret != (size_t) -1) {
1851 line = out_buffer;
1852 linelen = strlen(out_buffer);
1853 }
1854 }
1855
1856 if (!view->ops->read(view, line))
1857 goto alloc_error;
1858
1859 if (lines-- == 1)
1860 break;
1861 }
1862
1863 {
1864 int digits;
1865
1866 lines = view->lines;
1867 for (digits = 0; lines; digits++)
1868 lines /= 10;
1869
1870 /* Keep the displayed view in sync with line number scaling. */
1871 if (digits != view->digits) {
1872 view->digits = digits;
1873 redraw_from = 0;
1874 }
1875 }
1876
1877 if (!view_is_displayed(view))
1878 goto check_pipe;
1879
1880 if (view == VIEW(REQ_VIEW_TREE)) {
1881 /* Clear the view and redraw everything since the tree sorting
1882 * might have rearranged things. */
1883 redraw_view(view);
1884
1885 } else if (redraw_from >= 0) {
1886 /* If this is an incremental update, redraw the previous line
1887 * since for commits some members could have changed when
1888 * loading the main view. */
1889 if (redraw_from > 0)
1890 redraw_from--;
1891
1892 /* Incrementally draw avoids flickering. */
1893 redraw_view_from(view, redraw_from);
1894 }
1895
1896 /* Update the title _after_ the redraw so that if the redraw picks up a
1897 * commit reference in view->ref it'll be available here. */
1898 update_view_title(view);
1899
1900 check_pipe:
1901 if (ferror(view->pipe)) {
1902 report("Failed to read: %s", strerror(errno));
1903 goto end;
1904
1905 } else if (feof(view->pipe)) {
1906 report("");
1907 goto end;
1908 }
1909
1910 return TRUE;
1911
1912 alloc_error:
1913 report("Allocation failure");
1914
1915 end:
1916 end_update(view);
1917 return FALSE;
1918 }
1919
1920
1921 /*
1922 * View opening
1923 */
1924
1925 static void open_help_view(struct view *view)
1926 {
1927 char buf[BUFSIZ];
1928 int lines = ARRAY_SIZE(req_info) + 2;
1929 int i;
1930
1931 if (view->lines > 0)
1932 return;
1933
1934 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1935 if (!req_info[i].request)
1936 lines++;
1937
1938 view->line = calloc(lines, sizeof(*view->line));
1939 if (!view->line) {
1940 report("Allocation failure");
1941 return;
1942 }
1943
1944 view->ops->read(view, "Quick reference for tig keybindings:");
1945
1946 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1947 char *key;
1948
1949 if (!req_info[i].request) {
1950 view->ops->read(view, "");
1951 view->ops->read(view, req_info[i].help);
1952 continue;
1953 }
1954
1955 key = get_key(req_info[i].request);
1956 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1957 continue;
1958
1959 view->ops->read(view, buf);
1960 }
1961 }
1962
1963 enum open_flags {
1964 OPEN_DEFAULT = 0, /* Use default view switching. */
1965 OPEN_SPLIT = 1, /* Split current view. */
1966 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1967 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1968 };
1969
1970 static void
1971 open_view(struct view *prev, enum request request, enum open_flags flags)
1972 {
1973 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1974 bool split = !!(flags & OPEN_SPLIT);
1975 bool reload = !!(flags & OPEN_RELOAD);
1976 struct view *view = VIEW(request);
1977 int nviews = displayed_views();
1978 struct view *base_view = display[0];
1979
1980 if (view == prev && nviews == 1 && !reload) {
1981 report("Already in %s view", view->name);
1982 return;
1983 }
1984
1985 if (view == VIEW(REQ_VIEW_HELP)) {
1986 open_help_view(view);
1987
1988 } else if ((reload || strcmp(view->vid, view->id)) &&
1989 !begin_update(view)) {
1990 report("Failed to load %s view", view->name);
1991 return;
1992 }
1993
1994 if (split) {
1995 display[1] = view;
1996 if (!backgrounded)
1997 current_view = 1;
1998 } else {
1999 /* Maximize the current view. */
2000 memset(display, 0, sizeof(display));
2001 current_view = 0;
2002 display[current_view] = view;
2003 }
2004
2005 /* Resize the view when switching between split- and full-screen,
2006 * or when switching between two different full-screen views. */
2007 if (nviews != displayed_views() ||
2008 (nviews == 1 && base_view != display[0]))
2009 resize_display();
2010
2011 if (split && prev->lineno - prev->offset >= prev->height) {
2012 /* Take the title line into account. */
2013 int lines = prev->lineno - prev->offset - prev->height + 1;
2014
2015 /* Scroll the view that was split if the current line is
2016 * outside the new limited view. */
2017 do_scroll_view(prev, lines, TRUE);
2018 }
2019
2020 if (prev && view != prev) {
2021 if (split && !backgrounded) {
2022 /* "Blur" the previous view. */
2023 update_view_title(prev);
2024 }
2025
2026 view->parent = prev;
2027 }
2028
2029 if (view->pipe && view->lines == 0) {
2030 /* Clear the old view and let the incremental updating refill
2031 * the screen. */
2032 wclear(view->win);
2033 report("");
2034 } else {
2035 redraw_view(view);
2036 report("");
2037 }
2038
2039 /* If the view is backgrounded the above calls to report()
2040 * won't redraw the view title. */
2041 if (backgrounded)
2042 update_view_title(view);
2043 }
2044
2045
2046 /*
2047 * User request switch noodle
2048 */
2049
2050 static int
2051 view_driver(struct view *view, enum request request)
2052 {
2053 int i;
2054
2055 switch (request) {
2056 case REQ_MOVE_UP:
2057 case REQ_MOVE_DOWN:
2058 case REQ_MOVE_PAGE_UP:
2059 case REQ_MOVE_PAGE_DOWN:
2060 case REQ_MOVE_FIRST_LINE:
2061 case REQ_MOVE_LAST_LINE:
2062 move_view(view, request, TRUE);
2063 break;
2064
2065 case REQ_SCROLL_LINE_DOWN:
2066 case REQ_SCROLL_LINE_UP:
2067 case REQ_SCROLL_PAGE_DOWN:
2068 case REQ_SCROLL_PAGE_UP:
2069 scroll_view(view, request);
2070 break;
2071
2072 case REQ_VIEW_BLOB:
2073 if (!ref_blob[0]) {
2074 report("No file chosen, press 't' to open tree view");
2075 break;
2076 }
2077 /* Fall-through */
2078 case REQ_VIEW_MAIN:
2079 case REQ_VIEW_DIFF:
2080 case REQ_VIEW_LOG:
2081 case REQ_VIEW_TREE:
2082 case REQ_VIEW_HELP:
2083 case REQ_VIEW_PAGER:
2084 open_view(view, request, OPEN_DEFAULT);
2085 break;
2086
2087 case REQ_NEXT:
2088 case REQ_PREVIOUS:
2089 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2090
2091 if ((view == VIEW(REQ_VIEW_DIFF) &&
2092 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2093 (view == VIEW(REQ_VIEW_BLOB) &&
2094 view->parent == VIEW(REQ_VIEW_TREE))) {
2095 bool redraw = display[1] == view;
2096
2097 view = view->parent;
2098 move_view(view, request, redraw);
2099 if (redraw)
2100 update_view_title(view);
2101 } else {
2102 move_view(view, request, TRUE);
2103 break;
2104 }
2105 /* Fall-through */
2106
2107 case REQ_ENTER:
2108 if (!view->lines) {
2109 report("Nothing to enter");
2110 break;
2111 }
2112 return view->ops->enter(view, &view->line[view->lineno]);
2113
2114 case REQ_VIEW_NEXT:
2115 {
2116 int nviews = displayed_views();
2117 int next_view = (current_view + 1) % nviews;
2118
2119 if (next_view == current_view) {
2120 report("Only one view is displayed");
2121 break;
2122 }
2123
2124 current_view = next_view;
2125 /* Blur out the title of the previous view. */
2126 update_view_title(view);
2127 report("");
2128 break;
2129 }
2130 case REQ_TOGGLE_LINENO:
2131 opt_line_number = !opt_line_number;
2132 redraw_display();
2133 break;
2134
2135 case REQ_TOGGLE_REV_GRAPH:
2136 opt_rev_graph = !opt_rev_graph;
2137 redraw_display();
2138 break;
2139
2140 case REQ_PROMPT:
2141 /* Always reload^Wrerun commands from the prompt. */
2142 open_view(view, opt_request, OPEN_RELOAD);
2143 break;
2144
2145 case REQ_SEARCH:
2146 case REQ_SEARCH_BACK:
2147 search_view(view, request, opt_search);
2148 break;
2149
2150 case REQ_FIND_NEXT:
2151 case REQ_FIND_PREV:
2152 find_next(view, request);
2153 break;
2154
2155 case REQ_STOP_LOADING:
2156 for (i = 0; i < ARRAY_SIZE(views); i++) {
2157 view = &views[i];
2158 if (view->pipe)
2159 report("Stopped loading the %s view", view->name),
2160 end_update(view);
2161 }
2162 break;
2163
2164 case REQ_SHOW_VERSION:
2165 report("%s (built %s)", VERSION, __DATE__);
2166 return TRUE;
2167
2168 case REQ_SCREEN_RESIZE:
2169 resize_display();
2170 /* Fall-through */
2171 case REQ_SCREEN_REDRAW:
2172 redraw_display();
2173 break;
2174
2175 case REQ_NONE:
2176 doupdate();
2177 return TRUE;
2178
2179 case REQ_VIEW_CLOSE:
2180 /* XXX: Mark closed views by letting view->parent point to the
2181 * view itself. Parents to closed view should never be
2182 * followed. */
2183 if (view->parent &&
2184 view->parent->parent != view->parent) {
2185 memset(display, 0, sizeof(display));
2186 current_view = 0;
2187 display[current_view] = view->parent;
2188 view->parent = view;
2189 resize_display();
2190 redraw_display();
2191 break;
2192 }
2193 /* Fall-through */
2194 case REQ_QUIT:
2195 return FALSE;
2196
2197 default:
2198 /* An unknown key will show most commonly used commands. */
2199 report("Unknown key, press 'h' for help");
2200 return TRUE;
2201 }
2202
2203 return TRUE;
2204 }
2205
2206
2207 /*
2208 * Pager backend
2209 */
2210
2211 static bool
2212 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2213 {
2214 char *text = line->data;
2215 enum line_type type = line->type;
2216 int textlen = strlen(text);
2217 int attr;
2218
2219 wmove(view->win, lineno, 0);
2220
2221 if (selected) {
2222 type = LINE_CURSOR;
2223 wchgat(view->win, -1, 0, type, NULL);
2224 }
2225
2226 attr = get_line_attr(type);
2227 wattrset(view->win, attr);
2228
2229 if (opt_line_number || opt_tab_size < TABSIZE) {
2230 static char spaces[] = " ";
2231 int col_offset = 0, col = 0;
2232
2233 if (opt_line_number) {
2234 unsigned long real_lineno = view->offset + lineno + 1;
2235
2236 if (real_lineno == 1 ||
2237 (real_lineno % opt_num_interval) == 0) {
2238 wprintw(view->win, "%.*d", view->digits, real_lineno);
2239
2240 } else {
2241 waddnstr(view->win, spaces,
2242 MIN(view->digits, STRING_SIZE(spaces)));
2243 }
2244 waddstr(view->win, ": ");
2245 col_offset = view->digits + 2;
2246 }
2247
2248 while (text && col_offset + col < view->width) {
2249 int cols_max = view->width - col_offset - col;
2250 char *pos = text;
2251 int cols;
2252
2253 if (*text == '\t') {
2254 text++;
2255 assert(sizeof(spaces) > TABSIZE);
2256 pos = spaces;
2257 cols = opt_tab_size - (col % opt_tab_size);
2258
2259 } else {
2260 text = strchr(text, '\t');
2261 cols = line ? text - pos : strlen(pos);
2262 }
2263
2264 waddnstr(view->win, pos, MIN(cols, cols_max));
2265 col += cols;
2266 }
2267
2268 } else {
2269 int col = 0, pos = 0;
2270
2271 for (; pos < textlen && col < view->width; pos++, col++)
2272 if (text[pos] == '\t')
2273 col += TABSIZE - (col % TABSIZE) - 1;
2274
2275 waddnstr(view->win, text, pos);
2276 }
2277
2278 return TRUE;
2279 }
2280
2281 static bool
2282 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2283 {
2284 char refbuf[SIZEOF_STR];
2285 char *ref = NULL;
2286 FILE *pipe;
2287
2288 if (!string_format(refbuf, "git describe %s", commit_id))
2289 return TRUE;
2290
2291 pipe = popen(refbuf, "r");
2292 if (!pipe)
2293 return TRUE;
2294
2295 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2296 ref = chomp_string(ref);
2297 pclose(pipe);
2298
2299 if (!ref || !*ref)
2300 return TRUE;
2301
2302 /* This is the only fatal call, since it can "corrupt" the buffer. */
2303 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2304 return FALSE;
2305
2306 return TRUE;
2307 }
2308
2309 static void
2310 add_pager_refs(struct view *view, struct line *line)
2311 {
2312 char buf[SIZEOF_STR];
2313 char *commit_id = line->data + STRING_SIZE("commit ");
2314 struct ref **refs;
2315 size_t bufpos = 0, refpos = 0;
2316 const char *sep = "Refs: ";
2317 bool is_tag = FALSE;
2318
2319 assert(line->type == LINE_COMMIT);
2320
2321 refs = get_refs(commit_id);
2322 if (!refs) {
2323 if (view == VIEW(REQ_VIEW_DIFF))
2324 goto try_add_describe_ref;
2325 return;
2326 }
2327
2328 do {
2329 struct ref *ref = refs[refpos];
2330 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2331
2332 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2333 return;
2334 sep = ", ";
2335 if (ref->tag)
2336 is_tag = TRUE;
2337 } while (refs[refpos++]->next);
2338
2339 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2340 try_add_describe_ref:
2341 /* Add <tag>-g<commit_id> "fake" reference. */
2342 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2343 return;
2344 }
2345
2346 if (bufpos == 0)
2347 return;
2348
2349 if (!realloc_lines(view, view->line_size + 1))
2350 return;
2351
2352 line = &view->line[view->lines];
2353 line->data = strdup(buf);
2354 if (!line->data)
2355 return;
2356
2357 line->type = LINE_PP_REFS;
2358 view->lines++;
2359 }
2360
2361 static bool
2362 pager_read(struct view *view, char *data)
2363 {
2364 struct line *line = &view->line[view->lines];
2365
2366 line->data = strdup(data);
2367 if (!line->data)
2368 return FALSE;
2369
2370 line->type = get_line_type(line->data);
2371 view->lines++;
2372
2373 if (line->type == LINE_COMMIT &&
2374 (view == VIEW(REQ_VIEW_DIFF) ||
2375 view == VIEW(REQ_VIEW_LOG)))
2376 add_pager_refs(view, line);
2377
2378 return TRUE;
2379 }
2380
2381 static bool
2382 pager_enter(struct view *view, struct line *line)
2383 {
2384 int split = 0;
2385
2386 if (line->type == LINE_COMMIT &&
2387 (view == VIEW(REQ_VIEW_LOG) ||
2388 view == VIEW(REQ_VIEW_PAGER))) {
2389 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2390 split = 1;
2391 }
2392
2393 /* Always scroll the view even if it was split. That way
2394 * you can use Enter to scroll through the log view and
2395 * split open each commit diff. */
2396 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2397
2398 /* FIXME: A minor workaround. Scrolling the view will call report("")
2399 * but if we are scrolling a non-current view this won't properly
2400 * update the view title. */
2401 if (split)
2402 update_view_title(view);
2403
2404 return TRUE;
2405 }
2406
2407 static bool
2408 pager_grep(struct view *view, struct line *line)
2409 {
2410 regmatch_t pmatch;
2411 char *text = line->data;
2412
2413 if (!*text)
2414 return FALSE;
2415
2416 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2417 return FALSE;
2418
2419 return TRUE;
2420 }
2421
2422 static void
2423 pager_select(struct view *view, struct line *line)
2424 {
2425 if (line->type == LINE_COMMIT) {
2426 char *text = line->data;
2427
2428 string_copy(view->ref, text + STRING_SIZE("commit "));
2429 string_copy(ref_commit, view->ref);
2430 }
2431 }
2432
2433 static struct view_ops pager_ops = {
2434 "line",
2435 pager_draw,
2436 pager_read,
2437 pager_enter,
2438 pager_grep,
2439 pager_select,
2440 };
2441
2442
2443 /*
2444 * Tree backend
2445 */
2446
2447 /* Parse output from git ls-tree:
2448 *
2449 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2450 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2451 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2452 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2453 */
2454
2455 #define SIZEOF_TREE_ATTR \
2456 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2457
2458 #define TREE_UP_FORMAT "040000 tree %s\t.."
2459
2460 static int
2461 tree_compare_entry(enum line_type type1, char *name1,
2462 enum line_type type2, char *name2)
2463 {
2464 if (type1 != type2) {
2465 if (type1 == LINE_TREE_DIR)
2466 return -1;
2467 return 1;
2468 }
2469
2470 return strcmp(name1, name2);
2471 }
2472
2473 static bool
2474 tree_read(struct view *view, char *text)
2475 {
2476 size_t textlen = strlen(text);
2477 char buf[SIZEOF_STR];
2478 unsigned long pos;
2479 enum line_type type;
2480 bool first_read = view->lines == 0;
2481
2482 if (textlen <= SIZEOF_TREE_ATTR)
2483 return FALSE;
2484
2485 type = text[STRING_SIZE("100644 ")] == 't'
2486 ? LINE_TREE_DIR : LINE_TREE_FILE;
2487
2488 if (first_read) {
2489 /* Add path info line */
2490 if (string_format(buf, "Directory path /%s", opt_path) &&
2491 realloc_lines(view, view->line_size + 1) &&
2492 pager_read(view, buf))
2493 view->line[view->lines - 1].type = LINE_DEFAULT;
2494 else
2495 return FALSE;
2496
2497 /* Insert "link" to parent directory. */
2498 if (*opt_path &&
2499 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2500 realloc_lines(view, view->line_size + 1) &&
2501 pager_read(view, buf))
2502 view->line[view->lines - 1].type = LINE_TREE_DIR;
2503 else if (*opt_path)
2504 return FALSE;
2505 }
2506
2507 /* Strip the path part ... */
2508 if (*opt_path) {
2509 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2510 size_t striplen = strlen(opt_path);
2511 char *path = text + SIZEOF_TREE_ATTR;
2512
2513 if (pathlen > striplen)
2514 memmove(path, path + striplen,
2515 pathlen - striplen + 1);
2516 }
2517
2518 /* Skip "Directory ..." and ".." line. */
2519 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2520 struct line *line = &view->line[pos];
2521 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2522 char *path2 = text + SIZEOF_TREE_ATTR;
2523 int cmp = tree_compare_entry(line->type, path1, type, path2);
2524
2525 if (cmp <= 0)
2526 continue;
2527
2528 text = strdup(text);
2529 if (!text)
2530 return FALSE;
2531
2532 if (view->lines > pos)
2533 memmove(&view->line[pos + 1], &view->line[pos],
2534 (view->lines - pos) * sizeof(*line));
2535
2536 line = &view->line[pos];
2537 line->data = text;
2538 line->type = type;
2539 view->lines++;
2540 return TRUE;
2541 }
2542
2543 if (!pager_read(view, text))
2544 return FALSE;
2545
2546 /* Move the current line to the first tree entry. */
2547 if (first_read)
2548 view->lineno++;
2549
2550 view->line[view->lines - 1].type = type;
2551 return TRUE;
2552 }
2553
2554 static bool
2555 tree_enter(struct view *view, struct line *line)
2556 {
2557 enum open_flags flags = OPEN_DEFAULT;
2558 char *data = line->data;
2559 enum request request;
2560
2561 switch (line->type) {
2562 case LINE_TREE_DIR:
2563 /* Depending on whether it is a subdir or parent (updir?) link
2564 * mangle the path buffer. */
2565 if (line == &view->line[1] && *opt_path) {
2566 size_t path_len = strlen(opt_path);
2567 char *dirsep = opt_path + path_len - 1;
2568
2569 while (dirsep > opt_path && dirsep[-1] != '/')
2570 dirsep--;
2571
2572 dirsep[0] = 0;
2573
2574 } else {
2575 size_t pathlen = strlen(opt_path);
2576 size_t origlen = pathlen;
2577 char *basename = data + SIZEOF_TREE_ATTR;
2578
2579 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2580 opt_path[origlen] = 0;
2581 return TRUE;
2582 }
2583 }
2584
2585 /* Trees and subtrees share the same ID, so they are not not
2586 * unique like blobs. */
2587 flags |= OPEN_RELOAD;
2588 request = REQ_VIEW_TREE;
2589 break;
2590
2591 case LINE_TREE_FILE:
2592 /* This causes the blob view to become split, and not having it
2593 * in the tree dir case will make the blob view automatically
2594 * disappear when moving to a different directory. */
2595 flags |= OPEN_SPLIT;
2596 request = REQ_VIEW_BLOB;
2597 break;
2598
2599 default:
2600 return TRUE;
2601 }
2602
2603 open_view(view, request, flags);
2604
2605 if (!VIEW(request)->pipe)
2606 return TRUE;
2607
2608 /* For tree views insert the path to the parent as the first line. */
2609 if (request == REQ_VIEW_BLOB) {
2610 /* Mirror what is showed in the title bar. */
2611 string_ncopy(ref_blob, data + STRING_SIZE("100644 blob "), 40);
2612 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2613 return TRUE;
2614 }
2615
2616 return TRUE;
2617 }
2618
2619 static void
2620 tree_select(struct view *view, struct line *line)
2621 {
2622 if (line->type == LINE_TREE_DIR || line->type == LINE_TREE_FILE) {
2623 char *text = line->data;
2624
2625 string_ncopy(view->ref, text + STRING_SIZE("100644 blob "), 40);
2626 string_copy(ref_blob, view->ref);
2627 }
2628 }
2629
2630 static struct view_ops tree_ops = {
2631 "file",
2632 pager_draw,
2633 tree_read,
2634 tree_enter,
2635 pager_grep,
2636 tree_select,
2637 };
2638
2639 static bool
2640 blob_read(struct view *view, char *line)
2641 {
2642 bool state = pager_read(view, line);
2643
2644 if (state == TRUE)
2645 view->line[view->lines - 1].type = LINE_DEFAULT;
2646
2647 return state;
2648 }
2649
2650 static struct view_ops blob_ops = {
2651 "line",
2652 pager_draw,
2653 blob_read,
2654 pager_enter,
2655 pager_grep,
2656 pager_select,
2657 };
2658
2659
2660 /*
2661 * Main view backend
2662 */
2663
2664 struct commit {
2665 char id[41]; /* SHA1 ID. */
2666 char title[75]; /* First line of the commit message. */
2667 char author[75]; /* Author of the commit. */
2668 struct tm time; /* Date from the author ident. */
2669 struct ref **refs; /* Repository references. */
2670 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2671 size_t graph_size; /* The width of the graph array. */
2672 };
2673
2674 static bool
2675 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2676 {
2677 char buf[DATE_COLS + 1];
2678 struct commit *commit = line->data;
2679 enum line_type type;
2680 int col = 0;
2681 size_t timelen;
2682 size_t authorlen;
2683 int trimmed = 1;
2684
2685 if (!*commit->author)
2686 return FALSE;
2687
2688 wmove(view->win, lineno, col);
2689
2690 if (selected) {
2691 type = LINE_CURSOR;
2692 wattrset(view->win, get_line_attr(type));
2693 wchgat(view->win, -1, 0, type, NULL);
2694
2695 } else {
2696 type = LINE_MAIN_COMMIT;
2697 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2698 }
2699
2700 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2701 waddnstr(view->win, buf, timelen);
2702 waddstr(view->win, " ");
2703
2704 col += DATE_COLS;
2705 wmove(view->win, lineno, col);
2706 if (type != LINE_CURSOR)
2707 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2708
2709 if (opt_utf8) {
2710 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2711 } else {
2712 authorlen = strlen(commit->author);
2713 if (authorlen > AUTHOR_COLS - 2) {
2714 authorlen = AUTHOR_COLS - 2;
2715 trimmed = 1;
2716 }
2717 }
2718
2719 if (trimmed) {
2720 waddnstr(view->win, commit->author, authorlen);
2721 if (type != LINE_CURSOR)
2722 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2723 waddch(view->win, '~');
2724 } else {
2725 waddstr(view->win, commit->author);
2726 }
2727
2728 col += AUTHOR_COLS;
2729 if (type != LINE_CURSOR)
2730 wattrset(view->win, A_NORMAL);
2731
2732 if (opt_rev_graph && commit->graph_size) {
2733 size_t i;
2734
2735 wmove(view->win, lineno, col);
2736 /* Using waddch() instead of waddnstr() ensures that
2737 * they'll be rendered correctly for the cursor line. */
2738 for (i = 0; i < commit->graph_size; i++)
2739 waddch(view->win, commit->graph[i]);
2740
2741 col += commit->graph_size + 1;
2742 }
2743
2744 wmove(view->win, lineno, col);
2745
2746 if (commit->refs) {
2747 size_t i = 0;
2748
2749 do {
2750 if (type == LINE_CURSOR)
2751 ;
2752 else if (commit->refs[i]->tag)
2753 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2754 else
2755 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2756 waddstr(view->win, "[");
2757 waddstr(view->win, commit->refs[i]->name);
2758 waddstr(view->win, "]");
2759 if (type != LINE_CURSOR)
2760 wattrset(view->win, A_NORMAL);
2761 waddstr(view->win, " ");
2762 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2763 } while (commit->refs[i++]->next);
2764 }
2765
2766 if (type != LINE_CURSOR)
2767 wattrset(view->win, get_line_attr(type));
2768
2769 {
2770 int titlelen = strlen(commit->title);
2771
2772 if (col + titlelen > view->width)
2773 titlelen = view->width - col;
2774
2775 waddnstr(view->win, commit->title, titlelen);
2776 }
2777
2778 return TRUE;
2779 }
2780
2781 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2782 static bool
2783 main_read(struct view *view, char *line)
2784 {
2785 enum line_type type = get_line_type(line);
2786 struct commit *commit = view->lines
2787 ? view->line[view->lines - 1].data : NULL;
2788
2789 switch (type) {
2790 case LINE_COMMIT:
2791 commit = calloc(1, sizeof(struct commit));
2792 if (!commit)
2793 return FALSE;
2794
2795 line += STRING_SIZE("commit ");
2796
2797 view->line[view->lines++].data = commit;
2798 string_copy(commit->id, line);
2799 commit->refs = get_refs(commit->id);
2800 commit->graph[commit->graph_size++] = ACS_LTEE;
2801 break;
2802
2803 case LINE_AUTHOR:
2804 {
2805 char *ident = line + STRING_SIZE("author ");
2806 char *end = strchr(ident, '<');
2807
2808 if (!commit)
2809 break;
2810
2811 if (end) {
2812 char *email = end + 1;
2813
2814 for (; end > ident && isspace(end[-1]); end--) ;
2815
2816 if (end == ident && *email) {
2817 ident = email;
2818 end = strchr(ident, '>');
2819 for (; end > ident && isspace(end[-1]); end--) ;
2820 }
2821 *end = 0;
2822 }
2823
2824 /* End is NULL or ident meaning there's no author. */
2825 if (end <= ident)
2826 ident = "Unknown";
2827
2828 string_copy(commit->author, ident);
2829
2830 /* Parse epoch and timezone */
2831 if (end) {
2832 char *secs = strchr(end + 1, '>');
2833 char *zone;
2834 time_t time;
2835
2836 if (!secs || secs[1] != ' ')
2837 break;
2838
2839 secs += 2;
2840 time = (time_t) atol(secs);
2841 zone = strchr(secs, ' ');
2842 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2843 long tz;
2844
2845 zone++;
2846 tz = ('0' - zone[1]) * 60 * 60 * 10;
2847 tz += ('0' - zone[2]) * 60 * 60;
2848 tz += ('0' - zone[3]) * 60;
2849 tz += ('0' - zone[4]) * 60;
2850
2851 if (zone[0] == '-')
2852 tz = -tz;
2853
2854 time -= tz;
2855 }
2856 gmtime_r(&time, &commit->time);
2857 }
2858 break;
2859 }
2860 default:
2861 if (!commit)
2862 break;
2863
2864 /* Fill in the commit title if it has not already been set. */
2865 if (commit->title[0])
2866 break;
2867
2868 /* Require titles to start with a non-space character at the
2869 * offset used by git log. */
2870 /* FIXME: More gracefull handling of titles; append "..." to
2871 * shortened titles, etc. */
2872 if (strncmp(line, " ", 4) ||
2873 isspace(line[4]))
2874 break;
2875
2876 string_copy(commit->title, line + 4);
2877 }
2878
2879 return TRUE;
2880 }
2881
2882 static bool
2883 main_enter(struct view *view, struct line *line)
2884 {
2885 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2886
2887 open_view(view, REQ_VIEW_DIFF, flags);
2888 return TRUE;
2889 }
2890
2891 static bool
2892 main_grep(struct view *view, struct line *line)
2893 {
2894 struct commit *commit = line->data;
2895 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
2896 char buf[DATE_COLS + 1];
2897 regmatch_t pmatch;
2898
2899 for (state = S_TITLE; state < S_END; state++) {
2900 char *text;
2901
2902 switch (state) {
2903 case S_TITLE: text = commit->title; break;
2904 case S_AUTHOR: text = commit->author; break;
2905 case S_DATE:
2906 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
2907 continue;
2908 text = buf;
2909 break;
2910
2911 default:
2912 return FALSE;
2913 }
2914
2915 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
2916 return TRUE;
2917 }
2918
2919 return FALSE;
2920 }
2921
2922 static void
2923 main_select(struct view *view, struct line *line)
2924 {
2925 struct commit *commit = line->data;
2926
2927 string_copy(view->ref, commit->id);
2928 string_copy(ref_commit, view->ref);
2929 }
2930
2931 static struct view_ops main_ops = {
2932 "commit",
2933 main_draw,
2934 main_read,
2935 main_enter,
2936 main_grep,
2937 main_select,
2938 };
2939
2940
2941 /*
2942 * Unicode / UTF-8 handling
2943 *
2944 * NOTE: Much of the following code for dealing with unicode is derived from
2945 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2946 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2947 */
2948
2949 /* I've (over)annotated a lot of code snippets because I am not entirely
2950 * confident that the approach taken by this small UTF-8 interface is correct.
2951 * --jonas */
2952
2953 static inline int
2954 unicode_width(unsigned long c)
2955 {
2956 if (c >= 0x1100 &&
2957 (c <= 0x115f /* Hangul Jamo */
2958 || c == 0x2329
2959 || c == 0x232a
2960 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2961 /* CJK ... Yi */
2962 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2963 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2964 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2965 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2966 || (c >= 0xffe0 && c <= 0xffe6)
2967 || (c >= 0x20000 && c <= 0x2fffd)
2968 || (c >= 0x30000 && c <= 0x3fffd)))
2969 return 2;
2970
2971 return 1;
2972 }
2973
2974 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2975 * Illegal bytes are set one. */
2976 static const unsigned char utf8_bytes[256] = {
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 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2982 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2983 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,
2984 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,
2985 };
2986
2987 /* Decode UTF-8 multi-byte representation into a unicode character. */
2988 static inline unsigned long
2989 utf8_to_unicode(const char *string, size_t length)
2990 {
2991 unsigned long unicode;
2992
2993 switch (length) {
2994 case 1:
2995 unicode = string[0];
2996 break;
2997 case 2:
2998 unicode = (string[0] & 0x1f) << 6;
2999 unicode += (string[1] & 0x3f);
3000 break;
3001 case 3:
3002 unicode = (string[0] & 0x0f) << 12;
3003 unicode += ((string[1] & 0x3f) << 6);
3004 unicode += (string[2] & 0x3f);
3005 break;
3006 case 4:
3007 unicode = (string[0] & 0x0f) << 18;
3008 unicode += ((string[1] & 0x3f) << 12);
3009 unicode += ((string[2] & 0x3f) << 6);
3010 unicode += (string[3] & 0x3f);
3011 break;
3012 case 5:
3013 unicode = (string[0] & 0x0f) << 24;
3014 unicode += ((string[1] & 0x3f) << 18);
3015 unicode += ((string[2] & 0x3f) << 12);
3016 unicode += ((string[3] & 0x3f) << 6);
3017 unicode += (string[4] & 0x3f);
3018 break;
3019 case 6:
3020 unicode = (string[0] & 0x01) << 30;
3021 unicode += ((string[1] & 0x3f) << 24);
3022 unicode += ((string[2] & 0x3f) << 18);
3023 unicode += ((string[3] & 0x3f) << 12);
3024 unicode += ((string[4] & 0x3f) << 6);
3025 unicode += (string[5] & 0x3f);
3026 break;
3027 default:
3028 die("Invalid unicode length");
3029 }
3030
3031 /* Invalid characters could return the special 0xfffd value but NUL
3032 * should be just as good. */
3033 return unicode > 0xffff ? 0 : unicode;
3034 }
3035
3036 /* Calculates how much of string can be shown within the given maximum width
3037 * and sets trimmed parameter to non-zero value if all of string could not be
3038 * shown.
3039 *
3040 * Additionally, adds to coloffset how many many columns to move to align with
3041 * the expected position. Takes into account how multi-byte and double-width
3042 * characters will effect the cursor position.
3043 *
3044 * Returns the number of bytes to output from string to satisfy max_width. */
3045 static size_t
3046 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3047 {
3048 const char *start = string;
3049 const char *end = strchr(string, '\0');
3050 size_t mbwidth = 0;
3051 size_t width = 0;
3052
3053 *trimmed = 0;
3054
3055 while (string < end) {
3056 int c = *(unsigned char *) string;
3057 unsigned char bytes = utf8_bytes[c];
3058 size_t ucwidth;
3059 unsigned long unicode;
3060
3061 if (string + bytes > end)
3062 break;
3063
3064 /* Change representation to figure out whether
3065 * it is a single- or double-width character. */
3066
3067 unicode = utf8_to_unicode(string, bytes);
3068 /* FIXME: Graceful handling of invalid unicode character. */
3069 if (!unicode)
3070 break;
3071
3072 ucwidth = unicode_width(unicode);
3073 width += ucwidth;
3074 if (width > max_width) {
3075 *trimmed = 1;
3076 break;
3077 }
3078
3079 /* The column offset collects the differences between the
3080 * number of bytes encoding a character and the number of
3081 * columns will be used for rendering said character.
3082 *
3083 * So if some character A is encoded in 2 bytes, but will be
3084 * represented on the screen using only 1 byte this will and up
3085 * adding 1 to the multi-byte column offset.
3086 *
3087 * Assumes that no double-width character can be encoding in
3088 * less than two bytes. */
3089 if (bytes > ucwidth)
3090 mbwidth += bytes - ucwidth;
3091
3092 string += bytes;
3093 }
3094
3095 *coloffset += mbwidth;
3096
3097 return string - start;
3098 }
3099
3100
3101 /*
3102 * Status management
3103 */
3104
3105 /* Whether or not the curses interface has been initialized. */
3106 static bool cursed = FALSE;
3107
3108 /* The status window is used for polling keystrokes. */
3109 static WINDOW *status_win;
3110
3111 /* Update status and title window. */
3112 static void
3113 report(const char *msg, ...)
3114 {
3115 static bool empty = TRUE;
3116 struct view *view = display[current_view];
3117
3118 if (!empty || *msg) {
3119 va_list args;
3120
3121 va_start(args, msg);
3122
3123 werase(status_win);
3124 wmove(status_win, 0, 0);
3125 if (*msg) {
3126 vwprintw(status_win, msg, args);
3127 empty = FALSE;
3128 } else {
3129 empty = TRUE;
3130 }
3131 wrefresh(status_win);
3132
3133 va_end(args);
3134 }
3135
3136 update_view_title(view);
3137 update_display_cursor();
3138 }
3139
3140 /* Controls when nodelay should be in effect when polling user input. */
3141 static void
3142 set_nonblocking_input(bool loading)
3143 {
3144 static unsigned int loading_views;
3145
3146 if ((loading == FALSE && loading_views-- == 1) ||
3147 (loading == TRUE && loading_views++ == 0))
3148 nodelay(status_win, loading);
3149 }
3150
3151 static void
3152 init_display(void)
3153 {
3154 int x, y;
3155
3156 /* Initialize the curses library */
3157 if (isatty(STDIN_FILENO)) {
3158 cursed = !!initscr();
3159 } else {
3160 /* Leave stdin and stdout alone when acting as a pager. */
3161 FILE *io = fopen("/dev/tty", "r+");
3162
3163 if (!io)
3164 die("Failed to open /dev/tty");
3165 cursed = !!newterm(NULL, io, io);
3166 }
3167
3168 if (!cursed)
3169 die("Failed to initialize curses");
3170
3171 nonl(); /* Tell curses not to do NL->CR/NL on output */
3172 cbreak(); /* Take input chars one at a time, no wait for \n */
3173 noecho(); /* Don't echo input */
3174 leaveok(stdscr, TRUE);
3175
3176 if (has_colors())
3177 init_colors();
3178
3179 getmaxyx(stdscr, y, x);
3180 status_win = newwin(1, 0, y - 1, 0);
3181 if (!status_win)
3182 die("Failed to create status window");
3183
3184 /* Enable keyboard mapping */
3185 keypad(status_win, TRUE);
3186 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3187 }
3188
3189 static char *
3190 read_prompt(const char *prompt)
3191 {
3192 enum { READING, STOP, CANCEL } status = READING;
3193 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3194 int pos = 0;
3195
3196 while (status == READING) {
3197 struct view *view;
3198 int i, key;
3199
3200 foreach_view (view, i)
3201 update_view(view);
3202
3203 report("%s%.*s", prompt, pos, buf);
3204 /* Refresh, accept single keystroke of input */
3205 key = wgetch(status_win);
3206 switch (key) {
3207 case KEY_RETURN:
3208 case KEY_ENTER:
3209 case '\n':
3210 status = pos ? STOP : CANCEL;
3211 break;
3212
3213 case KEY_BACKSPACE:
3214 if (pos > 0)
3215 pos--;
3216 else
3217 status = CANCEL;
3218 break;
3219
3220 case KEY_ESC:
3221 status = CANCEL;
3222 break;
3223
3224 case ERR:
3225 break;
3226
3227 default:
3228 if (pos >= sizeof(buf)) {
3229 report("Input string too long");
3230 return NULL;
3231 }
3232
3233 if (isprint(key))
3234 buf[pos++] = (char) key;
3235 }
3236 }
3237
3238 if (status == CANCEL) {
3239 /* Clear the status window */
3240 report("");
3241 return NULL;
3242 }
3243
3244 buf[pos++] = 0;
3245
3246 return buf;
3247 }
3248
3249 /*
3250 * Repository references
3251 */
3252
3253 static struct ref *refs;
3254 static size_t refs_size;
3255
3256 /* Id <-> ref store */
3257 static struct ref ***id_refs;
3258 static size_t id_refs_size;
3259
3260 static struct ref **
3261 get_refs(char *id)
3262 {
3263 struct ref ***tmp_id_refs;
3264 struct ref **ref_list = NULL;
3265 size_t ref_list_size = 0;
3266 size_t i;
3267
3268 for (i = 0; i < id_refs_size; i++)
3269 if (!strcmp(id, id_refs[i][0]->id))
3270 return id_refs[i];
3271
3272 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3273 if (!tmp_id_refs)
3274 return NULL;
3275
3276 id_refs = tmp_id_refs;
3277
3278 for (i = 0; i < refs_size; i++) {
3279 struct ref **tmp;
3280
3281 if (strcmp(id, refs[i].id))
3282 continue;
3283
3284 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3285 if (!tmp) {
3286 if (ref_list)
3287 free(ref_list);
3288 return NULL;
3289 }
3290
3291 ref_list = tmp;
3292 if (ref_list_size > 0)
3293 ref_list[ref_list_size - 1]->next = 1;
3294 ref_list[ref_list_size] = &refs[i];
3295
3296 /* XXX: The properties of the commit chains ensures that we can
3297 * safely modify the shared ref. The repo references will
3298 * always be similar for the same id. */
3299 ref_list[ref_list_size]->next = 0;
3300 ref_list_size++;
3301 }
3302
3303 if (ref_list)
3304 id_refs[id_refs_size++] = ref_list;
3305
3306 return ref_list;
3307 }
3308
3309 static int
3310 read_ref(char *id, int idlen, char *name, int namelen)
3311 {
3312 struct ref *ref;
3313 bool tag = FALSE;
3314
3315 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3316 /* Commits referenced by tags has "^{}" appended. */
3317 if (name[namelen - 1] != '}')
3318 return OK;
3319
3320 while (namelen > 0 && name[namelen] != '^')
3321 namelen--;
3322
3323 tag = TRUE;
3324 namelen -= STRING_SIZE("refs/tags/");
3325 name += STRING_SIZE("refs/tags/");
3326
3327 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3328 namelen -= STRING_SIZE("refs/heads/");
3329 name += STRING_SIZE("refs/heads/");
3330
3331 } else if (!strcmp(name, "HEAD")) {
3332 return OK;
3333 }
3334
3335 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3336 if (!refs)
3337 return ERR;
3338
3339 ref = &refs[refs_size++];
3340 ref->name = malloc(namelen + 1);
3341 if (!ref->name)
3342 return ERR;
3343
3344 strncpy(ref->name, name, namelen);
3345 ref->name[namelen] = 0;
3346 ref->tag = tag;
3347 string_copy(ref->id, id);
3348
3349 return OK;
3350 }
3351
3352 static int
3353 load_refs(void)
3354 {
3355 const char *cmd_env = getenv("TIG_LS_REMOTE");
3356 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3357
3358 return read_properties(popen(cmd, "r"), "\t", read_ref);
3359 }
3360
3361 static int
3362 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3363 {
3364 if (!strcmp(name, "i18n.commitencoding"))
3365 string_copy(opt_encoding, value);
3366
3367 return OK;
3368 }
3369
3370 static int
3371 load_repo_config(void)
3372 {
3373 return read_properties(popen("git repo-config --list", "r"),
3374 "=", read_repo_config_option);
3375 }
3376
3377 static int
3378 read_properties(FILE *pipe, const char *separators,
3379 int (*read_property)(char *, int, char *, int))
3380 {
3381 char buffer[BUFSIZ];
3382 char *name;
3383 int state = OK;
3384
3385 if (!pipe)
3386 return ERR;
3387
3388 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3389 char *value;
3390 size_t namelen;
3391 size_t valuelen;
3392
3393 name = chomp_string(name);
3394 namelen = strcspn(name, separators);
3395
3396 if (name[namelen]) {
3397 name[namelen] = 0;
3398 value = chomp_string(name + namelen + 1);
3399 valuelen = strlen(value);
3400
3401 } else {
3402 value = "";
3403 valuelen = 0;
3404 }
3405
3406 state = read_property(name, namelen, value, valuelen);
3407 }
3408
3409 if (state != ERR && ferror(pipe))
3410 state = ERR;
3411
3412 pclose(pipe);
3413
3414 return state;
3415 }
3416
3417
3418 /*
3419 * Main
3420 */
3421
3422 static void __NORETURN
3423 quit(int sig)
3424 {
3425 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3426 if (cursed)
3427 endwin();
3428 exit(0);
3429 }
3430
3431 static void __NORETURN
3432 die(const char *err, ...)
3433 {
3434 va_list args;
3435
3436 endwin();
3437
3438 va_start(args, err);
3439 fputs("tig: ", stderr);
3440 vfprintf(stderr, err, args);
3441 fputs("\n", stderr);
3442 va_end(args);
3443
3444 exit(1);
3445 }
3446
3447 int
3448 main(int argc, char *argv[])
3449 {
3450 struct view *view;
3451 enum request request;
3452 size_t i;
3453
3454 signal(SIGINT, quit);
3455
3456 if (setlocale(LC_ALL, "")) {
3457 string_copy(opt_codeset, nl_langinfo(CODESET));
3458 }
3459
3460 if (load_options() == ERR)
3461 die("Failed to load user config.");
3462
3463 /* Load the repo config file so options can be overwritten from
3464 * the command line. */
3465 if (load_repo_config() == ERR)
3466 die("Failed to load repo config.");
3467
3468 if (!parse_options(argc, argv))
3469 return 0;
3470
3471 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3472 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3473 if (opt_iconv == ICONV_NONE)
3474 die("Failed to initialize character set conversion");
3475 }
3476
3477 if (load_refs() == ERR)
3478 die("Failed to load refs.");
3479
3480 /* Require a git repository unless when running in pager mode. */
3481 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3482 die("Not a git repository");
3483
3484 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3485 view->cmd_env = getenv(view->cmd_env);
3486
3487 request = opt_request;
3488
3489 init_display();
3490
3491 while (view_driver(display[current_view], request)) {
3492 int key;
3493 int i;
3494
3495 foreach_view (view, i)
3496 update_view(view);
3497
3498 /* Refresh, accept single keystroke of input */
3499 key = wgetch(status_win);
3500
3501 request = get_keybinding(display[current_view]->keymap, key);
3502
3503 /* Some low-level request handling. This keeps access to
3504 * status_win restricted. */
3505 switch (request) {
3506 case REQ_PROMPT:
3507 {
3508 char *cmd = read_prompt(":");
3509
3510 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3511 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3512 opt_request = REQ_VIEW_DIFF;
3513 } else {
3514 opt_request = REQ_VIEW_PAGER;
3515 }
3516 break;
3517 }
3518
3519 request = REQ_NONE;
3520 break;
3521 }
3522 case REQ_SEARCH:
3523 case REQ_SEARCH_BACK:
3524 {
3525 const char *prompt = request == REQ_SEARCH
3526 ? "/" : "?";
3527 char *search = read_prompt(prompt);
3528
3529 if (search)
3530 string_copy(opt_search, search);
3531 else
3532 request = REQ_NONE;
3533 break;
3534 }
3535 case REQ_SCREEN_RESIZE:
3536 {
3537 int height, width;
3538
3539 getmaxyx(stdscr, height, width);
3540
3541 /* Resize the status view and let the view driver take
3542 * care of resizing the displayed views. */
3543 wresize(status_win, 1, width);
3544 mvwin(status_win, height - 1, 0);
3545 wrefresh(status_win);
3546 break;
3547 }
3548 default:
3549 break;
3550 }
3551 }
3552
3553 quit(0);
3554
3555 return 0;
3556 }
Full-screen terminal Git browser.