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Fix redrawing of old current line
[tig] / tig.c
1 /* Copyright (c) 2006 Jonas Fonseca <fonseca@diku.dk>
2 *
3 * This program is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU General Public License as
5 * published by the Free Software Foundation; either version 2 of
6 * the License, or (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #ifndef VERSION
15 #define VERSION "tig-0.4.git"
16 #endif
17
18 #ifndef DEBUG
19 #define NDEBUG
20 #endif
21
22 #include <assert.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <signal.h>
26 #include <stdarg.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <time.h>
32
33 #include <sys/types.h>
34 #include <regex.h>
35
36 #include <locale.h>
37 #include <langinfo.h>
38 #include <iconv.h>
39
40 #include <curses.h>
41
42 #if __GNUC__ >= 3
43 #define __NORETURN __attribute__((__noreturn__))
44 #else
45 #define __NORETURN
46 #endif
47
48 static void __NORETURN die(const char *err, ...);
49 static void report(const char *msg, ...);
50 static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
51 static void set_nonblocking_input(bool loading);
52 static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
53
54 #define ABS(x) ((x) >= 0 ? (x) : -(x))
55 #define MIN(x, y) ((x) < (y) ? (x) : (y))
56
57 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
58 #define STRING_SIZE(x) (sizeof(x) - 1)
59
60 #define SIZEOF_STR 1024 /* Default string size. */
61 #define SIZEOF_REF 256 /* Size of symbolic or SHA1 ID. */
62 #define SIZEOF_REVGRAPH 19 /* Size of revision ancestry graphics. */
63
64 /* This color name can be used to refer to the default term colors. */
65 #define COLOR_DEFAULT (-1)
66
67 #define ICONV_NONE ((iconv_t) -1)
68
69 /* The format and size of the date column in the main view. */
70 #define DATE_FORMAT "%Y-%m-%d %H:%M"
71 #define DATE_COLS STRING_SIZE("2006-04-29 14:21 ")
72
73 #define AUTHOR_COLS 20
74
75 /* The default interval between line numbers. */
76 #define NUMBER_INTERVAL 1
77
78 #define TABSIZE 8
79
80 #define SCALE_SPLIT_VIEW(height) ((height) * 2 / 3)
81
82 #define TIG_LS_REMOTE \
83 "git ls-remote . 2>/dev/null"
84
85 #define TIG_DIFF_CMD \
86 "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
87
88 #define TIG_LOG_CMD \
89 "git log --cc --stat -n100 %s 2>/dev/null"
90
91 #define TIG_MAIN_CMD \
92 "git log --topo-order --pretty=raw %s 2>/dev/null"
93
94 #define TIG_TREE_CMD \
95 "git ls-tree %s %s"
96
97 #define TIG_BLOB_CMD \
98 "git cat-file blob %s"
99
100 /* XXX: Needs to be defined to the empty string. */
101 #define TIG_HELP_CMD ""
102 #define TIG_PAGER_CMD ""
103
104 /* Some ascii-shorthands fitted into the ncurses namespace. */
105 #define KEY_TAB '\t'
106 #define KEY_RETURN '\r'
107 #define KEY_ESC 27
108
109
110 struct ref {
111 char *name; /* Ref name; tag or head names are shortened. */
112 char id[41]; /* Commit SHA1 ID */
113 unsigned int tag:1; /* Is it a tag? */
114 unsigned int next:1; /* For ref lists: are there more refs? */
115 };
116
117 static struct ref **get_refs(char *id);
118
119 struct int_map {
120 const char *name;
121 int namelen;
122 int value;
123 };
124
125 static int
126 set_from_int_map(struct int_map *map, size_t map_size,
127 int *value, const char *name, int namelen)
128 {
129
130 int i;
131
132 for (i = 0; i < map_size; i++)
133 if (namelen == map[i].namelen &&
134 !strncasecmp(name, map[i].name, namelen)) {
135 *value = map[i].value;
136 return OK;
137 }
138
139 return ERR;
140 }
141
142
143 /*
144 * String helpers
145 */
146
147 static inline void
148 string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
149 {
150 if (srclen > dstlen - 1)
151 srclen = dstlen - 1;
152
153 strncpy(dst, src, srclen);
154 dst[srclen] = 0;
155 }
156
157 /* Shorthands for safely copying into a fixed buffer. */
158
159 #define string_copy(dst, src) \
160 string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
161
162 #define string_ncopy(dst, src, srclen) \
163 string_ncopy_do(dst, sizeof(dst), src, srclen)
164
165 static char *
166 chomp_string(char *name)
167 {
168 int namelen;
169
170 while (isspace(*name))
171 name++;
172
173 namelen = strlen(name) - 1;
174 while (namelen > 0 && isspace(name[namelen]))
175 name[namelen--] = 0;
176
177 return name;
178 }
179
180 static bool
181 string_nformat(char *buf, size_t bufsize, size_t *bufpos, const char *fmt, ...)
182 {
183 va_list args;
184 size_t pos = bufpos ? *bufpos : 0;
185
186 va_start(args, fmt);
187 pos += vsnprintf(buf + pos, bufsize - pos, fmt, args);
188 va_end(args);
189
190 if (bufpos)
191 *bufpos = pos;
192
193 return pos >= bufsize ? FALSE : TRUE;
194 }
195
196 #define string_format(buf, fmt, args...) \
197 string_nformat(buf, sizeof(buf), NULL, fmt, args)
198
199 #define string_format_from(buf, from, fmt, args...) \
200 string_nformat(buf, sizeof(buf), from, fmt, args)
201
202 static int
203 string_enum_compare(const char *str1, const char *str2, int len)
204 {
205 size_t i;
206
207 #define string_enum_sep(x) ((x) == '-' || (x) == '_' || (x) == '.')
208
209 /* Diff-Header == DIFF_HEADER */
210 for (i = 0; i < len; i++) {
211 if (toupper(str1[i]) == toupper(str2[i]))
212 continue;
213
214 if (string_enum_sep(str1[i]) &&
215 string_enum_sep(str2[i]))
216 continue;
217
218 return str1[i] - str2[i];
219 }
220
221 return 0;
222 }
223
224 /* Shell quoting
225 *
226 * NOTE: The following is a slightly modified copy of the git project's shell
227 * quoting routines found in the quote.c file.
228 *
229 * Help to copy the thing properly quoted for the shell safety. any single
230 * quote is replaced with '\'', any exclamation point is replaced with '\!',
231 * and the whole thing is enclosed in a
232 *
233 * E.g.
234 * original sq_quote result
235 * name ==> name ==> 'name'
236 * a b ==> a b ==> 'a b'
237 * a'b ==> a'\''b ==> 'a'\''b'
238 * a!b ==> a'\!'b ==> 'a'\!'b'
239 */
240
241 static size_t
242 sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
243 {
244 char c;
245
246 #define BUFPUT(x) do { if (bufsize < SIZEOF_STR) buf[bufsize++] = (x); } while (0)
247
248 BUFPUT('\'');
249 while ((c = *src++)) {
250 if (c == '\'' || c == '!') {
251 BUFPUT('\'');
252 BUFPUT('\\');
253 BUFPUT(c);
254 BUFPUT('\'');
255 } else {
256 BUFPUT(c);
257 }
258 }
259 BUFPUT('\'');
260
261 return bufsize;
262 }
263
264
265 /*
266 * User requests
267 */
268
269 #define REQ_INFO \
270 /* XXX: Keep the view request first and in sync with views[]. */ \
271 REQ_GROUP("View switching") \
272 REQ_(VIEW_MAIN, "Show main view"), \
273 REQ_(VIEW_DIFF, "Show diff view"), \
274 REQ_(VIEW_LOG, "Show log view"), \
275 REQ_(VIEW_TREE, "Show tree view"), \
276 REQ_(VIEW_BLOB, "Show blob view"), \
277 REQ_(VIEW_HELP, "Show help page"), \
278 REQ_(VIEW_PAGER, "Show pager view"), \
279 \
280 REQ_GROUP("View manipulation") \
281 REQ_(ENTER, "Enter current line and scroll"), \
282 REQ_(NEXT, "Move to next"), \
283 REQ_(PREVIOUS, "Move to previous"), \
284 REQ_(VIEW_NEXT, "Move focus to next view"), \
285 REQ_(VIEW_CLOSE, "Close the current view"), \
286 REQ_(QUIT, "Close all views and quit"), \
287 \
288 REQ_GROUP("Cursor navigation") \
289 REQ_(MOVE_UP, "Move cursor one line up"), \
290 REQ_(MOVE_DOWN, "Move cursor one line down"), \
291 REQ_(MOVE_PAGE_DOWN, "Move cursor one page down"), \
292 REQ_(MOVE_PAGE_UP, "Move cursor one page up"), \
293 REQ_(MOVE_FIRST_LINE, "Move cursor to first line"), \
294 REQ_(MOVE_LAST_LINE, "Move cursor to last line"), \
295 \
296 REQ_GROUP("Scrolling") \
297 REQ_(SCROLL_LINE_UP, "Scroll one line up"), \
298 REQ_(SCROLL_LINE_DOWN, "Scroll one line down"), \
299 REQ_(SCROLL_PAGE_UP, "Scroll one page up"), \
300 REQ_(SCROLL_PAGE_DOWN, "Scroll one page down"), \
301 \
302 REQ_GROUP("Searching") \
303 REQ_(SEARCH, "Search the view"), \
304 REQ_(SEARCH_BACK, "Search backwards in the view"), \
305 REQ_(FIND_NEXT, "Find next search match"), \
306 REQ_(FIND_PREV, "Find previous search match"), \
307 \
308 REQ_GROUP("Misc") \
309 REQ_(NONE, "Do nothing"), \
310 REQ_(PROMPT, "Bring up the prompt"), \
311 REQ_(SCREEN_REDRAW, "Redraw the screen"), \
312 REQ_(SCREEN_RESIZE, "Resize the screen"), \
313 REQ_(SHOW_VERSION, "Show version information"), \
314 REQ_(STOP_LOADING, "Stop all loading views"), \
315 REQ_(TOGGLE_LINENO, "Toggle line numbers"), \
316 REQ_(TOGGLE_REV_GRAPH, "Toggle revision graph visualization")
317
318
319 /* User action requests. */
320 enum request {
321 #define REQ_GROUP(help)
322 #define REQ_(req, help) REQ_##req
323
324 /* Offset all requests to avoid conflicts with ncurses getch values. */
325 REQ_OFFSET = KEY_MAX + 1,
326 REQ_INFO,
327 REQ_UNKNOWN,
328
329 #undef REQ_GROUP
330 #undef REQ_
331 };
332
333 struct request_info {
334 enum request request;
335 char *name;
336 int namelen;
337 char *help;
338 };
339
340 static struct request_info req_info[] = {
341 #define REQ_GROUP(help) { 0, NULL, 0, (help) },
342 #define REQ_(req, help) { REQ_##req, (#req), STRING_SIZE(#req), (help) }
343 REQ_INFO
344 #undef REQ_GROUP
345 #undef REQ_
346 };
347
348 static enum request
349 get_request(const char *name)
350 {
351 int namelen = strlen(name);
352 int i;
353
354 for (i = 0; i < ARRAY_SIZE(req_info); i++)
355 if (req_info[i].namelen == namelen &&
356 !string_enum_compare(req_info[i].name, name, namelen))
357 return req_info[i].request;
358
359 return REQ_UNKNOWN;
360 }
361
362
363 /*
364 * Options
365 */
366
367 static const char usage[] =
368 VERSION " (" __DATE__ ")\n"
369 "\n"
370 "Usage: tig [options]\n"
371 " or: tig [options] [--] [git log options]\n"
372 " or: tig [options] log [git log options]\n"
373 " or: tig [options] diff [git diff options]\n"
374 " or: tig [options] show [git show options]\n"
375 " or: tig [options] < [git command output]\n"
376 "\n"
377 "Options:\n"
378 " -l Start up in log view\n"
379 " -d Start up in diff view\n"
380 " -n[I], --line-number[=I] Show line numbers with given interval\n"
381 " -b[N], --tab-size[=N] Set number of spaces for tab expansion\n"
382 " -- Mark end of tig options\n"
383 " -v, --version Show version and exit\n"
384 " -h, --help Show help message and exit\n";
385
386 /* Option and state variables. */
387 static bool opt_line_number = FALSE;
388 static bool opt_rev_graph = TRUE;
389 static int opt_num_interval = NUMBER_INTERVAL;
390 static int opt_tab_size = TABSIZE;
391 static enum request opt_request = REQ_VIEW_MAIN;
392 static char opt_cmd[SIZEOF_STR] = "";
393 static char opt_path[SIZEOF_STR] = "";
394 static FILE *opt_pipe = NULL;
395 static char opt_encoding[20] = "UTF-8";
396 static bool opt_utf8 = TRUE;
397 static char opt_codeset[20] = "UTF-8";
398 static iconv_t opt_iconv = ICONV_NONE;
399 static char opt_search[SIZEOF_STR] = "";
400
401 enum option_type {
402 OPT_NONE,
403 OPT_INT,
404 };
405
406 static bool
407 check_option(char *opt, char short_name, char *name, enum option_type type, ...)
408 {
409 va_list args;
410 char *value = "";
411 int *number;
412
413 if (opt[0] != '-')
414 return FALSE;
415
416 if (opt[1] == '-') {
417 int namelen = strlen(name);
418
419 opt += 2;
420
421 if (strncmp(opt, name, namelen))
422 return FALSE;
423
424 if (opt[namelen] == '=')
425 value = opt + namelen + 1;
426
427 } else {
428 if (!short_name || opt[1] != short_name)
429 return FALSE;
430 value = opt + 2;
431 }
432
433 va_start(args, type);
434 if (type == OPT_INT) {
435 number = va_arg(args, int *);
436 if (isdigit(*value))
437 *number = atoi(value);
438 }
439 va_end(args);
440
441 return TRUE;
442 }
443
444 /* Returns the index of log or diff command or -1 to exit. */
445 static bool
446 parse_options(int argc, char *argv[])
447 {
448 int i;
449
450 for (i = 1; i < argc; i++) {
451 char *opt = argv[i];
452
453 if (!strcmp(opt, "-l")) {
454 opt_request = REQ_VIEW_LOG;
455 continue;
456 }
457
458 if (!strcmp(opt, "-d")) {
459 opt_request = REQ_VIEW_DIFF;
460 continue;
461 }
462
463 if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
464 opt_line_number = TRUE;
465 continue;
466 }
467
468 if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
469 opt_tab_size = MIN(opt_tab_size, TABSIZE);
470 continue;
471 }
472
473 if (check_option(opt, 'v', "version", OPT_NONE)) {
474 printf("tig version %s\n", VERSION);
475 return FALSE;
476 }
477
478 if (check_option(opt, 'h', "help", OPT_NONE)) {
479 printf(usage);
480 return FALSE;
481 }
482
483 if (!strcmp(opt, "--")) {
484 i++;
485 break;
486 }
487
488 if (!strcmp(opt, "log") ||
489 !strcmp(opt, "diff") ||
490 !strcmp(opt, "show")) {
491 opt_request = opt[0] == 'l'
492 ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
493 break;
494 }
495
496 if (opt[0] && opt[0] != '-')
497 break;
498
499 die("unknown option '%s'\n\n%s", opt, usage);
500 }
501
502 if (!isatty(STDIN_FILENO)) {
503 opt_request = REQ_VIEW_PAGER;
504 opt_pipe = stdin;
505
506 } else if (i < argc) {
507 size_t buf_size;
508
509 if (opt_request == REQ_VIEW_MAIN)
510 /* XXX: This is vulnerable to the user overriding
511 * options required for the main view parser. */
512 string_copy(opt_cmd, "git log --stat --pretty=raw");
513 else
514 string_copy(opt_cmd, "git");
515 buf_size = strlen(opt_cmd);
516
517 while (buf_size < sizeof(opt_cmd) && i < argc) {
518 opt_cmd[buf_size++] = ' ';
519 buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
520 }
521
522 if (buf_size >= sizeof(opt_cmd))
523 die("command too long");
524
525 opt_cmd[buf_size] = 0;
526
527 }
528
529 if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
530 opt_utf8 = FALSE;
531
532 return TRUE;
533 }
534
535
536 /*
537 * Line-oriented content detection.
538 */
539
540 #define LINE_INFO \
541 LINE(DIFF_HEADER, "diff --git ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
542 LINE(DIFF_CHUNK, "@@", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
543 LINE(DIFF_ADD, "+", COLOR_GREEN, COLOR_DEFAULT, 0), \
544 LINE(DIFF_DEL, "-", COLOR_RED, COLOR_DEFAULT, 0), \
545 LINE(DIFF_INDEX, "index ", COLOR_BLUE, COLOR_DEFAULT, 0), \
546 LINE(DIFF_OLDMODE, "old file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
547 LINE(DIFF_NEWMODE, "new file mode ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
548 LINE(DIFF_COPY_FROM, "copy from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
549 LINE(DIFF_COPY_TO, "copy to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
550 LINE(DIFF_RENAME_FROM, "rename from", COLOR_YELLOW, COLOR_DEFAULT, 0), \
551 LINE(DIFF_RENAME_TO, "rename to", COLOR_YELLOW, COLOR_DEFAULT, 0), \
552 LINE(DIFF_SIMILARITY, "similarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
553 LINE(DIFF_DISSIMILARITY,"dissimilarity ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
554 LINE(DIFF_TREE, "diff-tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
555 LINE(PP_AUTHOR, "Author: ", COLOR_CYAN, COLOR_DEFAULT, 0), \
556 LINE(PP_COMMIT, "Commit: ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
557 LINE(PP_MERGE, "Merge: ", COLOR_BLUE, COLOR_DEFAULT, 0), \
558 LINE(PP_DATE, "Date: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
559 LINE(PP_ADATE, "AuthorDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
560 LINE(PP_CDATE, "CommitDate: ", COLOR_YELLOW, COLOR_DEFAULT, 0), \
561 LINE(PP_REFS, "Refs: ", COLOR_RED, COLOR_DEFAULT, 0), \
562 LINE(COMMIT, "commit ", COLOR_GREEN, COLOR_DEFAULT, 0), \
563 LINE(PARENT, "parent ", COLOR_BLUE, COLOR_DEFAULT, 0), \
564 LINE(TREE, "tree ", COLOR_BLUE, COLOR_DEFAULT, 0), \
565 LINE(AUTHOR, "author ", COLOR_CYAN, COLOR_DEFAULT, 0), \
566 LINE(COMMITTER, "committer ", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
567 LINE(SIGNOFF, " Signed-off-by", COLOR_YELLOW, COLOR_DEFAULT, 0), \
568 LINE(DEFAULT, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
569 LINE(CURSOR, "", COLOR_WHITE, COLOR_GREEN, A_BOLD), \
570 LINE(STATUS, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
571 LINE(TITLE_BLUR, "", COLOR_WHITE, COLOR_BLUE, 0), \
572 LINE(TITLE_FOCUS, "", COLOR_WHITE, COLOR_BLUE, A_BOLD), \
573 LINE(MAIN_DATE, "", COLOR_BLUE, COLOR_DEFAULT, 0), \
574 LINE(MAIN_AUTHOR, "", COLOR_GREEN, COLOR_DEFAULT, 0), \
575 LINE(MAIN_COMMIT, "", COLOR_DEFAULT, COLOR_DEFAULT, 0), \
576 LINE(MAIN_DELIM, "", COLOR_MAGENTA, COLOR_DEFAULT, 0), \
577 LINE(MAIN_TAG, "", COLOR_MAGENTA, COLOR_DEFAULT, A_BOLD), \
578 LINE(MAIN_REF, "", COLOR_CYAN, COLOR_DEFAULT, A_BOLD), \
579 LINE(TREE_DIR, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL), \
580 LINE(TREE_FILE, "", COLOR_DEFAULT, COLOR_DEFAULT, A_NORMAL)
581
582 enum line_type {
583 #define LINE(type, line, fg, bg, attr) \
584 LINE_##type
585 LINE_INFO
586 #undef LINE
587 };
588
589 struct line_info {
590 const char *name; /* Option name. */
591 int namelen; /* Size of option name. */
592 const char *line; /* The start of line to match. */
593 int linelen; /* Size of string to match. */
594 int fg, bg, attr; /* Color and text attributes for the lines. */
595 };
596
597 static struct line_info line_info[] = {
598 #define LINE(type, line, fg, bg, attr) \
599 { #type, STRING_SIZE(#type), (line), STRING_SIZE(line), (fg), (bg), (attr) }
600 LINE_INFO
601 #undef LINE
602 };
603
604 static enum line_type
605 get_line_type(char *line)
606 {
607 int linelen = strlen(line);
608 enum line_type type;
609
610 for (type = 0; type < ARRAY_SIZE(line_info); type++)
611 /* Case insensitive search matches Signed-off-by lines better. */
612 if (linelen >= line_info[type].linelen &&
613 !strncasecmp(line_info[type].line, line, line_info[type].linelen))
614 return type;
615
616 return LINE_DEFAULT;
617 }
618
619 static inline int
620 get_line_attr(enum line_type type)
621 {
622 assert(type < ARRAY_SIZE(line_info));
623 return COLOR_PAIR(type) | line_info[type].attr;
624 }
625
626 static struct line_info *
627 get_line_info(char *name, int namelen)
628 {
629 enum line_type type;
630
631 for (type = 0; type < ARRAY_SIZE(line_info); type++)
632 if (namelen == line_info[type].namelen &&
633 !string_enum_compare(line_info[type].name, name, namelen))
634 return &line_info[type];
635
636 return NULL;
637 }
638
639 static void
640 init_colors(void)
641 {
642 int default_bg = COLOR_BLACK;
643 int default_fg = COLOR_WHITE;
644 enum line_type type;
645
646 start_color();
647
648 if (use_default_colors() != ERR) {
649 default_bg = -1;
650 default_fg = -1;
651 }
652
653 for (type = 0; type < ARRAY_SIZE(line_info); type++) {
654 struct line_info *info = &line_info[type];
655 int bg = info->bg == COLOR_DEFAULT ? default_bg : info->bg;
656 int fg = info->fg == COLOR_DEFAULT ? default_fg : info->fg;
657
658 init_pair(type, fg, bg);
659 }
660 }
661
662 struct line {
663 enum line_type type;
664
665 /* State flags */
666 unsigned int selected:1;
667
668 void *data; /* User data */
669 };
670
671
672 /*
673 * Keys
674 */
675
676 struct keybinding {
677 int alias;
678 enum request request;
679 struct keybinding *next;
680 };
681
682 static struct keybinding default_keybindings[] = {
683 /* View switching */
684 { 'm', REQ_VIEW_MAIN },
685 { 'd', REQ_VIEW_DIFF },
686 { 'l', REQ_VIEW_LOG },
687 { 't', REQ_VIEW_TREE },
688 { 'f', REQ_VIEW_BLOB },
689 { 'p', REQ_VIEW_PAGER },
690 { 'h', REQ_VIEW_HELP },
691
692 /* View manipulation */
693 { 'q', REQ_VIEW_CLOSE },
694 { KEY_TAB, REQ_VIEW_NEXT },
695 { KEY_RETURN, REQ_ENTER },
696 { KEY_UP, REQ_PREVIOUS },
697 { KEY_DOWN, REQ_NEXT },
698
699 /* Cursor navigation */
700 { 'k', REQ_MOVE_UP },
701 { 'j', REQ_MOVE_DOWN },
702 { KEY_HOME, REQ_MOVE_FIRST_LINE },
703 { KEY_END, REQ_MOVE_LAST_LINE },
704 { KEY_NPAGE, REQ_MOVE_PAGE_DOWN },
705 { ' ', REQ_MOVE_PAGE_DOWN },
706 { KEY_PPAGE, REQ_MOVE_PAGE_UP },
707 { 'b', REQ_MOVE_PAGE_UP },
708 { '-', REQ_MOVE_PAGE_UP },
709
710 /* Scrolling */
711 { KEY_IC, REQ_SCROLL_LINE_UP },
712 { KEY_DC, REQ_SCROLL_LINE_DOWN },
713 { 'w', REQ_SCROLL_PAGE_UP },
714 { 's', REQ_SCROLL_PAGE_DOWN },
715
716 /* Searching */
717 { '/', REQ_SEARCH },
718 { '?', REQ_SEARCH_BACK },
719 { 'n', REQ_FIND_NEXT },
720 { 'N', REQ_FIND_PREV },
721
722 /* Misc */
723 { 'Q', REQ_QUIT },
724 { 'z', REQ_STOP_LOADING },
725 { 'v', REQ_SHOW_VERSION },
726 { 'r', REQ_SCREEN_REDRAW },
727 { '.', REQ_TOGGLE_LINENO },
728 { 'g', REQ_TOGGLE_REV_GRAPH },
729 { ':', REQ_PROMPT },
730
731 /* wgetch() with nodelay() enabled returns ERR when there's no input. */
732 { ERR, REQ_NONE },
733
734 /* Using the ncurses SIGWINCH handler. */
735 { KEY_RESIZE, REQ_SCREEN_RESIZE },
736 };
737
738 #define KEYMAP_INFO \
739 KEYMAP_(GENERIC), \
740 KEYMAP_(MAIN), \
741 KEYMAP_(DIFF), \
742 KEYMAP_(LOG), \
743 KEYMAP_(TREE), \
744 KEYMAP_(BLOB), \
745 KEYMAP_(PAGER), \
746 KEYMAP_(HELP) \
747
748 enum keymap {
749 #define KEYMAP_(name) KEYMAP_##name
750 KEYMAP_INFO
751 #undef KEYMAP_
752 };
753
754 static struct int_map keymap_table[] = {
755 #define KEYMAP_(name) { #name, STRING_SIZE(#name), KEYMAP_##name }
756 KEYMAP_INFO
757 #undef KEYMAP_
758 };
759
760 #define set_keymap(map, name) \
761 set_from_int_map(keymap_table, ARRAY_SIZE(keymap_table), map, name, strlen(name))
762
763 static struct keybinding *keybindings[ARRAY_SIZE(keymap_table)];
764
765 static void
766 add_keybinding(enum keymap keymap, enum request request, int key)
767 {
768 struct keybinding *keybinding;
769
770 keybinding = calloc(1, sizeof(*keybinding));
771 if (!keybinding)
772 die("Failed to allocate keybinding");
773
774 keybinding->alias = key;
775 keybinding->request = request;
776 keybinding->next = keybindings[keymap];
777 keybindings[keymap] = keybinding;
778 }
779
780 /* Looks for a key binding first in the given map, then in the generic map, and
781 * lastly in the default keybindings. */
782 static enum request
783 get_keybinding(enum keymap keymap, int key)
784 {
785 struct keybinding *kbd;
786 int i;
787
788 for (kbd = keybindings[keymap]; kbd; kbd = kbd->next)
789 if (kbd->alias == key)
790 return kbd->request;
791
792 for (kbd = keybindings[KEYMAP_GENERIC]; kbd; kbd = kbd->next)
793 if (kbd->alias == key)
794 return kbd->request;
795
796 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++)
797 if (default_keybindings[i].alias == key)
798 return default_keybindings[i].request;
799
800 return (enum request) key;
801 }
802
803
804 struct key {
805 char *name;
806 int value;
807 };
808
809 static struct key key_table[] = {
810 { "Enter", KEY_RETURN },
811 { "Space", ' ' },
812 { "Backspace", KEY_BACKSPACE },
813 { "Tab", KEY_TAB },
814 { "Escape", KEY_ESC },
815 { "Left", KEY_LEFT },
816 { "Right", KEY_RIGHT },
817 { "Up", KEY_UP },
818 { "Down", KEY_DOWN },
819 { "Insert", KEY_IC },
820 { "Delete", KEY_DC },
821 { "Hash", '#' },
822 { "Home", KEY_HOME },
823 { "End", KEY_END },
824 { "PageUp", KEY_PPAGE },
825 { "PageDown", KEY_NPAGE },
826 { "F1", KEY_F(1) },
827 { "F2", KEY_F(2) },
828 { "F3", KEY_F(3) },
829 { "F4", KEY_F(4) },
830 { "F5", KEY_F(5) },
831 { "F6", KEY_F(6) },
832 { "F7", KEY_F(7) },
833 { "F8", KEY_F(8) },
834 { "F9", KEY_F(9) },
835 { "F10", KEY_F(10) },
836 { "F11", KEY_F(11) },
837 { "F12", KEY_F(12) },
838 };
839
840 static int
841 get_key_value(const char *name)
842 {
843 int i;
844
845 for (i = 0; i < ARRAY_SIZE(key_table); i++)
846 if (!strcasecmp(key_table[i].name, name))
847 return key_table[i].value;
848
849 if (strlen(name) == 1 && isprint(*name))
850 return (int) *name;
851
852 return ERR;
853 }
854
855 static char *
856 get_key(enum request request)
857 {
858 static char buf[BUFSIZ];
859 static char key_char[] = "'X'";
860 size_t pos = 0;
861 char *sep = " ";
862 int i;
863
864 buf[pos] = 0;
865
866 for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
867 struct keybinding *keybinding = &default_keybindings[i];
868 char *seq = NULL;
869 int key;
870
871 if (keybinding->request != request)
872 continue;
873
874 for (key = 0; key < ARRAY_SIZE(key_table); key++)
875 if (key_table[key].value == keybinding->alias)
876 seq = key_table[key].name;
877
878 if (seq == NULL &&
879 keybinding->alias < 127 &&
880 isprint(keybinding->alias)) {
881 key_char[1] = (char) keybinding->alias;
882 seq = key_char;
883 }
884
885 if (!seq)
886 seq = "'?'";
887
888 if (!string_format_from(buf, &pos, "%s%s", sep, seq))
889 return "Too many keybindings!";
890 sep = ", ";
891 }
892
893 return buf;
894 }
895
896
897 /*
898 * User config file handling.
899 */
900
901 static struct int_map color_map[] = {
902 #define COLOR_MAP(name) { #name, STRING_SIZE(#name), COLOR_##name }
903 COLOR_MAP(DEFAULT),
904 COLOR_MAP(BLACK),
905 COLOR_MAP(BLUE),
906 COLOR_MAP(CYAN),
907 COLOR_MAP(GREEN),
908 COLOR_MAP(MAGENTA),
909 COLOR_MAP(RED),
910 COLOR_MAP(WHITE),
911 COLOR_MAP(YELLOW),
912 };
913
914 #define set_color(color, name) \
915 set_from_int_map(color_map, ARRAY_SIZE(color_map), color, name, strlen(name))
916
917 static struct int_map attr_map[] = {
918 #define ATTR_MAP(name) { #name, STRING_SIZE(#name), A_##name }
919 ATTR_MAP(NORMAL),
920 ATTR_MAP(BLINK),
921 ATTR_MAP(BOLD),
922 ATTR_MAP(DIM),
923 ATTR_MAP(REVERSE),
924 ATTR_MAP(STANDOUT),
925 ATTR_MAP(UNDERLINE),
926 };
927
928 #define set_attribute(attr, name) \
929 set_from_int_map(attr_map, ARRAY_SIZE(attr_map), attr, name, strlen(name))
930
931 static int config_lineno;
932 static bool config_errors;
933 static char *config_msg;
934
935 /* Wants: object fgcolor bgcolor [attr] */
936 static int
937 option_color_command(int argc, char *argv[])
938 {
939 struct line_info *info;
940
941 if (argc != 3 && argc != 4) {
942 config_msg = "Wrong number of arguments given to color command";
943 return ERR;
944 }
945
946 info = get_line_info(argv[0], strlen(argv[0]));
947 if (!info) {
948 config_msg = "Unknown color name";
949 return ERR;
950 }
951
952 if (set_color(&info->fg, argv[1]) == ERR ||
953 set_color(&info->bg, argv[2]) == ERR) {
954 config_msg = "Unknown color";
955 return ERR;
956 }
957
958 if (argc == 4 && set_attribute(&info->attr, argv[3]) == ERR) {
959 config_msg = "Unknown attribute";
960 return ERR;
961 }
962
963 return OK;
964 }
965
966 /* Wants: name = value */
967 static int
968 option_set_command(int argc, char *argv[])
969 {
970 if (argc != 3) {
971 config_msg = "Wrong number of arguments given to set command";
972 return ERR;
973 }
974
975 if (strcmp(argv[1], "=")) {
976 config_msg = "No value assigned";
977 return ERR;
978 }
979
980 if (!strcmp(argv[0], "show-rev-graph")) {
981 opt_rev_graph = (!strcmp(argv[2], "1") ||
982 !strcmp(argv[2], "true") ||
983 !strcmp(argv[2], "yes"));
984 return OK;
985 }
986
987 if (!strcmp(argv[0], "line-number-interval")) {
988 opt_num_interval = atoi(argv[2]);
989 return OK;
990 }
991
992 if (!strcmp(argv[0], "tab-size")) {
993 opt_tab_size = atoi(argv[2]);
994 return OK;
995 }
996
997 if (!strcmp(argv[0], "commit-encoding")) {
998 char *arg = argv[2];
999 int delimiter = *arg;
1000 int i;
1001
1002 switch (delimiter) {
1003 case '"':
1004 case '\'':
1005 for (arg++, i = 0; arg[i]; i++)
1006 if (arg[i] == delimiter) {
1007 arg[i] = 0;
1008 break;
1009 }
1010 default:
1011 string_copy(opt_encoding, arg);
1012 return OK;
1013 }
1014 }
1015
1016 config_msg = "Unknown variable name";
1017 return ERR;
1018 }
1019
1020 /* Wants: mode request key */
1021 static int
1022 option_bind_command(int argc, char *argv[])
1023 {
1024 enum request request;
1025 int keymap;
1026 int key;
1027
1028 if (argc != 3) {
1029 config_msg = "Wrong number of arguments given to bind command";
1030 return ERR;
1031 }
1032
1033 if (set_keymap(&keymap, argv[0]) == ERR) {
1034 config_msg = "Unknown key map";
1035 return ERR;
1036 }
1037
1038 key = get_key_value(argv[1]);
1039 if (key == ERR) {
1040 config_msg = "Unknown key";
1041 return ERR;
1042 }
1043
1044 request = get_request(argv[2]);
1045 if (request == REQ_UNKNOWN) {
1046 config_msg = "Unknown request name";
1047 return ERR;
1048 }
1049
1050 add_keybinding(keymap, request, key);
1051
1052 return OK;
1053 }
1054
1055 static int
1056 set_option(char *opt, char *value)
1057 {
1058 char *argv[16];
1059 int valuelen;
1060 int argc = 0;
1061
1062 /* Tokenize */
1063 while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
1064 argv[argc++] = value;
1065
1066 value += valuelen;
1067 if (!*value)
1068 break;
1069
1070 *value++ = 0;
1071 while (isspace(*value))
1072 value++;
1073 }
1074
1075 if (!strcmp(opt, "color"))
1076 return option_color_command(argc, argv);
1077
1078 if (!strcmp(opt, "set"))
1079 return option_set_command(argc, argv);
1080
1081 if (!strcmp(opt, "bind"))
1082 return option_bind_command(argc, argv);
1083
1084 config_msg = "Unknown option command";
1085 return ERR;
1086 }
1087
1088 static int
1089 read_option(char *opt, int optlen, char *value, int valuelen)
1090 {
1091 int status = OK;
1092
1093 config_lineno++;
1094 config_msg = "Internal error";
1095
1096 /* Check for comment markers, since read_properties() will
1097 * only ensure opt and value are split at first " \t". */
1098 optlen = strcspn(opt, "#");
1099 if (optlen == 0)
1100 return OK;
1101
1102 if (opt[optlen] != 0) {
1103 config_msg = "No option value";
1104 status = ERR;
1105
1106 } else {
1107 /* Look for comment endings in the value. */
1108 int len = strcspn(value, "#");
1109
1110 if (len < valuelen) {
1111 valuelen = len;
1112 value[valuelen] = 0;
1113 }
1114
1115 status = set_option(opt, value);
1116 }
1117
1118 if (status == ERR) {
1119 fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
1120 config_lineno, optlen, opt, config_msg);
1121 config_errors = TRUE;
1122 }
1123
1124 /* Always keep going if errors are encountered. */
1125 return OK;
1126 }
1127
1128 static int
1129 load_options(void)
1130 {
1131 char *home = getenv("HOME");
1132 char buf[SIZEOF_STR];
1133 FILE *file;
1134
1135 config_lineno = 0;
1136 config_errors = FALSE;
1137
1138 if (!home || !string_format(buf, "%s/.tigrc", home))
1139 return ERR;
1140
1141 /* It's ok that the file doesn't exist. */
1142 file = fopen(buf, "r");
1143 if (!file)
1144 return OK;
1145
1146 if (read_properties(file, " \t", read_option) == ERR ||
1147 config_errors == TRUE)
1148 fprintf(stderr, "Errors while loading %s.\n", buf);
1149
1150 return OK;
1151 }
1152
1153
1154 /*
1155 * The viewer
1156 */
1157
1158 struct view;
1159 struct view_ops;
1160
1161 /* The display array of active views and the index of the current view. */
1162 static struct view *display[2];
1163 static unsigned int current_view;
1164
1165 #define foreach_displayed_view(view, i) \
1166 for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++)
1167
1168 #define displayed_views() (display[1] != NULL ? 2 : 1)
1169
1170 /* Current head and commit ID */
1171 static char ref_blob[SIZEOF_REF] = "";
1172 static char ref_commit[SIZEOF_REF] = "HEAD";
1173 static char ref_head[SIZEOF_REF] = "HEAD";
1174
1175 struct view {
1176 const char *name; /* View name */
1177 const char *cmd_fmt; /* Default command line format */
1178 const char *cmd_env; /* Command line set via environment */
1179 const char *id; /* Points to either of ref_{head,commit,blob} */
1180
1181 struct view_ops *ops; /* View operations */
1182
1183 enum keymap keymap; /* What keymap does this view have */
1184
1185 char cmd[SIZEOF_STR]; /* Command buffer */
1186 char ref[SIZEOF_REF]; /* Hovered commit reference */
1187 char vid[SIZEOF_REF]; /* View ID. Set to id member when updating. */
1188
1189 int height, width; /* The width and height of the main window */
1190 WINDOW *win; /* The main window */
1191 WINDOW *title; /* The title window living below the main window */
1192
1193 /* Navigation */
1194 unsigned long offset; /* Offset of the window top */
1195 unsigned long lineno; /* Current line number */
1196
1197 /* Searching */
1198 char grep[SIZEOF_STR]; /* Search string */
1199 regex_t *regex; /* Pre-compiled regex */
1200
1201 /* If non-NULL, points to the view that opened this view. If this view
1202 * is closed tig will switch back to the parent view. */
1203 struct view *parent;
1204
1205 /* Buffering */
1206 unsigned long lines; /* Total number of lines */
1207 struct line *line; /* Line index */
1208 unsigned long line_size;/* Total number of allocated lines */
1209 unsigned int digits; /* Number of digits in the lines member. */
1210
1211 /* Loading */
1212 FILE *pipe;
1213 time_t start_time;
1214 };
1215
1216 struct view_ops {
1217 /* What type of content being displayed. Used in the title bar. */
1218 const char *type;
1219 /* Draw one line; @lineno must be < view->height. */
1220 bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
1221 /* Read one line; updates view->line. */
1222 bool (*read)(struct view *view, char *data);
1223 /* Depending on view, change display based on current line. */
1224 bool (*enter)(struct view *view, struct line *line);
1225 /* Search for regex in a line. */
1226 bool (*grep)(struct view *view, struct line *line);
1227 /* Select line */
1228 void (*select)(struct view *view, struct line *line);
1229 };
1230
1231 static struct view_ops pager_ops;
1232 static struct view_ops main_ops;
1233 static struct view_ops tree_ops;
1234 static struct view_ops blob_ops;
1235
1236 #define VIEW_STR(name, cmd, env, ref, ops, map) \
1237 { name, cmd, #env, ref, ops, map}
1238
1239 #define VIEW_(id, name, ops, ref) \
1240 VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops, KEYMAP_##id)
1241
1242
1243 static struct view views[] = {
1244 VIEW_(MAIN, "main", &main_ops, ref_head),
1245 VIEW_(DIFF, "diff", &pager_ops, ref_commit),
1246 VIEW_(LOG, "log", &pager_ops, ref_head),
1247 VIEW_(TREE, "tree", &tree_ops, ref_commit),
1248 VIEW_(BLOB, "blob", &blob_ops, ref_blob),
1249 VIEW_(HELP, "help", &pager_ops, "static"),
1250 VIEW_(PAGER, "pager", &pager_ops, "static"),
1251 };
1252
1253 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
1254
1255 #define foreach_view(view, i) \
1256 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
1257
1258 #define view_is_displayed(view) \
1259 (view == display[0] || view == display[1])
1260
1261 static bool
1262 draw_view_line(struct view *view, unsigned int lineno)
1263 {
1264 struct line *line;
1265 bool selected = (view->offset + lineno == view->lineno);
1266
1267 assert(view_is_displayed(view));
1268
1269 if (view->offset + lineno >= view->lines)
1270 return FALSE;
1271
1272 line = &view->line[view->offset + lineno];
1273
1274 if (selected) {
1275 line->selected = TRUE;
1276 view->ops->select(view, line);
1277 } else if (line->selected) {
1278 line->selected = FALSE;
1279 wmove(view->win, lineno, 0);
1280 wclrtoeol(view->win);
1281 }
1282
1283 return view->ops->draw(view, line, lineno, selected);
1284 }
1285
1286 static void
1287 redraw_view_from(struct view *view, int lineno)
1288 {
1289 assert(0 <= lineno && lineno < view->height);
1290
1291 for (; lineno < view->height; lineno++) {
1292 if (!draw_view_line(view, lineno))
1293 break;
1294 }
1295
1296 redrawwin(view->win);
1297 wrefresh(view->win);
1298 }
1299
1300 static void
1301 redraw_view(struct view *view)
1302 {
1303 wclear(view->win);
1304 redraw_view_from(view, 0);
1305 }
1306
1307
1308 static void
1309 update_view_title(struct view *view)
1310 {
1311 assert(view_is_displayed(view));
1312
1313 if (view == display[current_view])
1314 wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS));
1315 else
1316 wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR));
1317
1318 werase(view->title);
1319 wmove(view->title, 0, 0);
1320
1321 if (*view->ref)
1322 wprintw(view->title, "[%s] %s", view->name, view->ref);
1323 else
1324 wprintw(view->title, "[%s]", view->name);
1325
1326 if (view->lines || view->pipe) {
1327 unsigned int view_lines = view->offset + view->height;
1328 unsigned int lines = view->lines
1329 ? MIN(view_lines, view->lines) * 100 / view->lines
1330 : 0;
1331
1332 wprintw(view->title, " - %s %d of %d (%d%%)",
1333 view->ops->type,
1334 view->lineno + 1,
1335 view->lines,
1336 lines);
1337 }
1338
1339 if (view->pipe) {
1340 time_t secs = time(NULL) - view->start_time;
1341
1342 /* Three git seconds are a long time ... */
1343 if (secs > 2)
1344 wprintw(view->title, " %lds", secs);
1345 }
1346
1347 wmove(view->title, 0, view->width - 1);
1348 wrefresh(view->title);
1349 }
1350
1351 static void
1352 resize_display(void)
1353 {
1354 int offset, i;
1355 struct view *base = display[0];
1356 struct view *view = display[1] ? display[1] : display[0];
1357
1358 /* Setup window dimensions */
1359
1360 getmaxyx(stdscr, base->height, base->width);
1361
1362 /* Make room for the status window. */
1363 base->height -= 1;
1364
1365 if (view != base) {
1366 /* Horizontal split. */
1367 view->width = base->width;
1368 view->height = SCALE_SPLIT_VIEW(base->height);
1369 base->height -= view->height;
1370
1371 /* Make room for the title bar. */
1372 view->height -= 1;
1373 }
1374
1375 /* Make room for the title bar. */
1376 base->height -= 1;
1377
1378 offset = 0;
1379
1380 foreach_displayed_view (view, i) {
1381 if (!view->win) {
1382 view->win = newwin(view->height, 0, offset, 0);
1383 if (!view->win)
1384 die("Failed to create %s view", view->name);
1385
1386 scrollok(view->win, TRUE);
1387
1388 view->title = newwin(1, 0, offset + view->height, 0);
1389 if (!view->title)
1390 die("Failed to create title window");
1391
1392 } else {
1393 wresize(view->win, view->height, view->width);
1394 mvwin(view->win, offset, 0);
1395 mvwin(view->title, offset + view->height, 0);
1396 }
1397
1398 offset += view->height + 1;
1399 }
1400 }
1401
1402 static void
1403 redraw_display(void)
1404 {
1405 struct view *view;
1406 int i;
1407
1408 foreach_displayed_view (view, i) {
1409 redraw_view(view);
1410 update_view_title(view);
1411 }
1412 }
1413
1414 static void
1415 update_display_cursor(void)
1416 {
1417 struct view *view = display[current_view];
1418
1419 /* Move the cursor to the right-most column of the cursor line.
1420 *
1421 * XXX: This could turn out to be a bit expensive, but it ensures that
1422 * the cursor does not jump around. */
1423 if (view->lines) {
1424 wmove(view->win, view->lineno - view->offset, view->width - 1);
1425 wrefresh(view->win);
1426 }
1427 }
1428
1429 /*
1430 * Navigation
1431 */
1432
1433 /* Scrolling backend */
1434 static void
1435 do_scroll_view(struct view *view, int lines)
1436 {
1437 bool redraw_current_line = FALSE;
1438
1439 /* The rendering expects the new offset. */
1440 view->offset += lines;
1441
1442 assert(0 <= view->offset && view->offset < view->lines);
1443 assert(lines);
1444
1445 /* Move current line into the view. */
1446 if (view->lineno < view->offset) {
1447 view->lineno = view->offset;
1448 redraw_current_line = TRUE;
1449 } else if (view->lineno >= view->offset + view->height) {
1450 view->lineno = view->offset + view->height - 1;
1451 redraw_current_line = TRUE;
1452 }
1453
1454 assert(view->offset <= view->lineno && view->lineno < view->lines);
1455
1456 /* Redraw the whole screen if scrolling is pointless. */
1457 if (view->height < ABS(lines)) {
1458 redraw_view(view);
1459
1460 } else {
1461 int line = lines > 0 ? view->height - lines : 0;
1462 int end = line + ABS(lines);
1463
1464 wscrl(view->win, lines);
1465
1466 for (; line < end; line++) {
1467 if (!draw_view_line(view, line))
1468 break;
1469 }
1470
1471 if (redraw_current_line)
1472 draw_view_line(view, view->lineno - view->offset);
1473 }
1474
1475 redrawwin(view->win);
1476 wrefresh(view->win);
1477 report("");
1478 }
1479
1480 /* Scroll frontend */
1481 static void
1482 scroll_view(struct view *view, enum request request)
1483 {
1484 int lines = 1;
1485
1486 assert(view_is_displayed(view));
1487
1488 switch (request) {
1489 case REQ_SCROLL_PAGE_DOWN:
1490 lines = view->height;
1491 case REQ_SCROLL_LINE_DOWN:
1492 if (view->offset + lines > view->lines)
1493 lines = view->lines - view->offset;
1494
1495 if (lines == 0 || view->offset + view->height >= view->lines) {
1496 report("Cannot scroll beyond the last line");
1497 return;
1498 }
1499 break;
1500
1501 case REQ_SCROLL_PAGE_UP:
1502 lines = view->height;
1503 case REQ_SCROLL_LINE_UP:
1504 if (lines > view->offset)
1505 lines = view->offset;
1506
1507 if (lines == 0) {
1508 report("Cannot scroll beyond the first line");
1509 return;
1510 }
1511
1512 lines = -lines;
1513 break;
1514
1515 default:
1516 die("request %d not handled in switch", request);
1517 }
1518
1519 do_scroll_view(view, lines);
1520 }
1521
1522 /* Cursor moving */
1523 static void
1524 move_view(struct view *view, enum request request)
1525 {
1526 int scroll_steps = 0;
1527 int steps;
1528
1529 switch (request) {
1530 case REQ_MOVE_FIRST_LINE:
1531 steps = -view->lineno;
1532 break;
1533
1534 case REQ_MOVE_LAST_LINE:
1535 steps = view->lines - view->lineno - 1;
1536 break;
1537
1538 case REQ_MOVE_PAGE_UP:
1539 steps = view->height > view->lineno
1540 ? -view->lineno : -view->height;
1541 break;
1542
1543 case REQ_MOVE_PAGE_DOWN:
1544 steps = view->lineno + view->height >= view->lines
1545 ? view->lines - view->lineno - 1 : view->height;
1546 break;
1547
1548 case REQ_MOVE_UP:
1549 steps = -1;
1550 break;
1551
1552 case REQ_MOVE_DOWN:
1553 steps = 1;
1554 break;
1555
1556 default:
1557 die("request %d not handled in switch", request);
1558 }
1559
1560 if (steps <= 0 && view->lineno == 0) {
1561 report("Cannot move beyond the first line");
1562 return;
1563
1564 } else if (steps >= 0 && view->lineno + 1 >= view->lines) {
1565 report("Cannot move beyond the last line");
1566 return;
1567 }
1568
1569 /* Move the current line */
1570 view->lineno += steps;
1571 assert(0 <= view->lineno && view->lineno < view->lines);
1572
1573 /* Check whether the view needs to be scrolled */
1574 if (view->lineno < view->offset ||
1575 view->lineno >= view->offset + view->height) {
1576 scroll_steps = steps;
1577 if (steps < 0 && -steps > view->offset) {
1578 scroll_steps = -view->offset;
1579
1580 } else if (steps > 0) {
1581 if (view->lineno == view->lines - 1 &&
1582 view->lines > view->height) {
1583 scroll_steps = view->lines - view->offset - 1;
1584 if (scroll_steps >= view->height)
1585 scroll_steps -= view->height - 1;
1586 }
1587 }
1588 }
1589
1590 if (!view_is_displayed(view)) {
1591 view->offset += steps;
1592 view->ops->select(view, &view->line[view->lineno]);
1593 return;
1594 }
1595
1596 /* Repaint the old "current" line if we be scrolling */
1597 if (ABS(steps) < view->height)
1598 draw_view_line(view, view->lineno - steps - view->offset);
1599
1600 if (scroll_steps) {
1601 do_scroll_view(view, scroll_steps);
1602 return;
1603 }
1604
1605 /* Draw the current line */
1606 draw_view_line(view, view->lineno - view->offset);
1607
1608 redrawwin(view->win);
1609 wrefresh(view->win);
1610 report("");
1611 }
1612
1613
1614 /*
1615 * Searching
1616 */
1617
1618 static void search_view(struct view *view, enum request request);
1619
1620 static bool
1621 find_next_line(struct view *view, unsigned long lineno, struct line *line)
1622 {
1623 assert(view_is_displayed(view));
1624
1625 if (!view->ops->grep(view, line))
1626 return FALSE;
1627
1628 if (lineno - view->offset >= view->height) {
1629 view->offset = lineno;
1630 view->lineno = lineno;
1631 redraw_view(view);
1632
1633 } else {
1634 unsigned long old_lineno = view->lineno - view->offset;
1635
1636 view->lineno = lineno;
1637 draw_view_line(view, old_lineno);
1638
1639 draw_view_line(view, view->lineno - view->offset);
1640 redrawwin(view->win);
1641 wrefresh(view->win);
1642 }
1643
1644 report("Line %ld matches '%s'", lineno + 1, view->grep);
1645 return TRUE;
1646 }
1647
1648 static void
1649 find_next(struct view *view, enum request request)
1650 {
1651 unsigned long lineno = view->lineno;
1652 int direction;
1653
1654 if (!*view->grep) {
1655 if (!*opt_search)
1656 report("No previous search");
1657 else
1658 search_view(view, request);
1659 return;
1660 }
1661
1662 switch (request) {
1663 case REQ_SEARCH:
1664 case REQ_FIND_NEXT:
1665 direction = 1;
1666 break;
1667
1668 case REQ_SEARCH_BACK:
1669 case REQ_FIND_PREV:
1670 direction = -1;
1671 break;
1672
1673 default:
1674 return;
1675 }
1676
1677 if (request == REQ_FIND_NEXT || request == REQ_FIND_PREV)
1678 lineno += direction;
1679
1680 /* Note, lineno is unsigned long so will wrap around in which case it
1681 * will become bigger than view->lines. */
1682 for (; lineno < view->lines; lineno += direction) {
1683 struct line *line = &view->line[lineno];
1684
1685 if (find_next_line(view, lineno, line))
1686 return;
1687 }
1688
1689 report("No match found for '%s'", view->grep);
1690 }
1691
1692 static void
1693 search_view(struct view *view, enum request request)
1694 {
1695 int regex_err;
1696
1697 if (view->regex) {
1698 regfree(view->regex);
1699 *view->grep = 0;
1700 } else {
1701 view->regex = calloc(1, sizeof(*view->regex));
1702 if (!view->regex)
1703 return;
1704 }
1705
1706 regex_err = regcomp(view->regex, opt_search, REG_EXTENDED);
1707 if (regex_err != 0) {
1708 char buf[SIZEOF_STR] = "unknown error";
1709
1710 regerror(regex_err, view->regex, buf, sizeof(buf));
1711 report("Search failed: %s", buf);
1712 return;
1713 }
1714
1715 string_copy(view->grep, opt_search);
1716
1717 find_next(view, request);
1718 }
1719
1720 /*
1721 * Incremental updating
1722 */
1723
1724 static void
1725 end_update(struct view *view)
1726 {
1727 if (!view->pipe)
1728 return;
1729 set_nonblocking_input(FALSE);
1730 if (view->pipe == stdin)
1731 fclose(view->pipe);
1732 else
1733 pclose(view->pipe);
1734 view->pipe = NULL;
1735 }
1736
1737 static bool
1738 begin_update(struct view *view)
1739 {
1740 const char *id = view->id;
1741
1742 if (view->pipe)
1743 end_update(view);
1744
1745 if (opt_cmd[0]) {
1746 string_copy(view->cmd, opt_cmd);
1747 opt_cmd[0] = 0;
1748 /* When running random commands, the view ref could have become
1749 * invalid so clear it. */
1750 view->ref[0] = 0;
1751
1752 } else if (view == VIEW(REQ_VIEW_TREE)) {
1753 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1754
1755 if (strcmp(view->vid, view->id))
1756 opt_path[0] = 0;
1757
1758 if (!string_format(view->cmd, format, id, opt_path))
1759 return FALSE;
1760
1761 } else {
1762 const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
1763
1764 if (!string_format(view->cmd, format, id, id, id, id, id))
1765 return FALSE;
1766 }
1767
1768 /* Special case for the pager view. */
1769 if (opt_pipe) {
1770 view->pipe = opt_pipe;
1771 opt_pipe = NULL;
1772 } else {
1773 view->pipe = popen(view->cmd, "r");
1774 }
1775
1776 if (!view->pipe)
1777 return FALSE;
1778
1779 set_nonblocking_input(TRUE);
1780
1781 view->offset = 0;
1782 view->lines = 0;
1783 view->lineno = 0;
1784 string_copy(view->vid, id);
1785
1786 if (view->line) {
1787 int i;
1788
1789 for (i = 0; i < view->lines; i++)
1790 if (view->line[i].data)
1791 free(view->line[i].data);
1792
1793 free(view->line);
1794 view->line = NULL;
1795 }
1796
1797 view->start_time = time(NULL);
1798
1799 return TRUE;
1800 }
1801
1802 static struct line *
1803 realloc_lines(struct view *view, size_t line_size)
1804 {
1805 struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
1806
1807 if (!tmp)
1808 return NULL;
1809
1810 view->line = tmp;
1811 view->line_size = line_size;
1812 return view->line;
1813 }
1814
1815 static bool
1816 update_view(struct view *view)
1817 {
1818 char in_buffer[BUFSIZ];
1819 char out_buffer[BUFSIZ * 2];
1820 char *line;
1821 /* The number of lines to read. If too low it will cause too much
1822 * redrawing (and possible flickering), if too high responsiveness
1823 * will suffer. */
1824 unsigned long lines = view->height;
1825 int redraw_from = -1;
1826
1827 if (!view->pipe)
1828 return TRUE;
1829
1830 /* Only redraw if lines are visible. */
1831 if (view->offset + view->height >= view->lines)
1832 redraw_from = view->lines - view->offset;
1833
1834 /* FIXME: This is probably not perfect for backgrounded views. */
1835 if (!realloc_lines(view, view->lines + lines))
1836 goto alloc_error;
1837
1838 while ((line = fgets(in_buffer, sizeof(in_buffer), view->pipe))) {
1839 size_t linelen = strlen(line);
1840
1841 if (linelen)
1842 line[linelen - 1] = 0;
1843
1844 if (opt_iconv != ICONV_NONE) {
1845 char *inbuf = line;
1846 size_t inlen = linelen;
1847
1848 char *outbuf = out_buffer;
1849 size_t outlen = sizeof(out_buffer);
1850
1851 size_t ret;
1852
1853 ret = iconv(opt_iconv, &inbuf, &inlen, &outbuf, &outlen);
1854 if (ret != (size_t) -1) {
1855 line = out_buffer;
1856 linelen = strlen(out_buffer);
1857 }
1858 }
1859
1860 if (!view->ops->read(view, line))
1861 goto alloc_error;
1862
1863 if (lines-- == 1)
1864 break;
1865 }
1866
1867 {
1868 int digits;
1869
1870 lines = view->lines;
1871 for (digits = 0; lines; digits++)
1872 lines /= 10;
1873
1874 /* Keep the displayed view in sync with line number scaling. */
1875 if (digits != view->digits) {
1876 view->digits = digits;
1877 redraw_from = 0;
1878 }
1879 }
1880
1881 if (!view_is_displayed(view))
1882 goto check_pipe;
1883
1884 if (view == VIEW(REQ_VIEW_TREE)) {
1885 /* Clear the view and redraw everything since the tree sorting
1886 * might have rearranged things. */
1887 redraw_view(view);
1888
1889 } else if (redraw_from >= 0) {
1890 /* If this is an incremental update, redraw the previous line
1891 * since for commits some members could have changed when
1892 * loading the main view. */
1893 if (redraw_from > 0)
1894 redraw_from--;
1895
1896 /* Incrementally draw avoids flickering. */
1897 redraw_view_from(view, redraw_from);
1898 }
1899
1900 /* Update the title _after_ the redraw so that if the redraw picks up a
1901 * commit reference in view->ref it'll be available here. */
1902 update_view_title(view);
1903
1904 check_pipe:
1905 if (ferror(view->pipe)) {
1906 report("Failed to read: %s", strerror(errno));
1907 goto end;
1908
1909 } else if (feof(view->pipe)) {
1910 report("");
1911 goto end;
1912 }
1913
1914 return TRUE;
1915
1916 alloc_error:
1917 report("Allocation failure");
1918
1919 end:
1920 end_update(view);
1921 return FALSE;
1922 }
1923
1924
1925 /*
1926 * View opening
1927 */
1928
1929 static void open_help_view(struct view *view)
1930 {
1931 char buf[BUFSIZ];
1932 int lines = ARRAY_SIZE(req_info) + 2;
1933 int i;
1934
1935 if (view->lines > 0)
1936 return;
1937
1938 for (i = 0; i < ARRAY_SIZE(req_info); i++)
1939 if (!req_info[i].request)
1940 lines++;
1941
1942 view->line = calloc(lines, sizeof(*view->line));
1943 if (!view->line) {
1944 report("Allocation failure");
1945 return;
1946 }
1947
1948 view->ops->read(view, "Quick reference for tig keybindings:");
1949
1950 for (i = 0; i < ARRAY_SIZE(req_info); i++) {
1951 char *key;
1952
1953 if (!req_info[i].request) {
1954 view->ops->read(view, "");
1955 view->ops->read(view, req_info[i].help);
1956 continue;
1957 }
1958
1959 key = get_key(req_info[i].request);
1960 if (!string_format(buf, "%-25s %s", key, req_info[i].help))
1961 continue;
1962
1963 view->ops->read(view, buf);
1964 }
1965 }
1966
1967 enum open_flags {
1968 OPEN_DEFAULT = 0, /* Use default view switching. */
1969 OPEN_SPLIT = 1, /* Split current view. */
1970 OPEN_BACKGROUNDED = 2, /* Backgrounded. */
1971 OPEN_RELOAD = 4, /* Reload view even if it is the current. */
1972 };
1973
1974 static void
1975 open_view(struct view *prev, enum request request, enum open_flags flags)
1976 {
1977 bool backgrounded = !!(flags & OPEN_BACKGROUNDED);
1978 bool split = !!(flags & OPEN_SPLIT);
1979 bool reload = !!(flags & OPEN_RELOAD);
1980 struct view *view = VIEW(request);
1981 int nviews = displayed_views();
1982 struct view *base_view = display[0];
1983
1984 if (view == prev && nviews == 1 && !reload) {
1985 report("Already in %s view", view->name);
1986 return;
1987 }
1988
1989 if (view == VIEW(REQ_VIEW_HELP)) {
1990 open_help_view(view);
1991
1992 } else if ((reload || strcmp(view->vid, view->id)) &&
1993 !begin_update(view)) {
1994 report("Failed to load %s view", view->name);
1995 return;
1996 }
1997
1998 if (split) {
1999 display[1] = view;
2000 if (!backgrounded)
2001 current_view = 1;
2002 } else {
2003 /* Maximize the current view. */
2004 memset(display, 0, sizeof(display));
2005 current_view = 0;
2006 display[current_view] = view;
2007 }
2008
2009 /* Resize the view when switching between split- and full-screen,
2010 * or when switching between two different full-screen views. */
2011 if (nviews != displayed_views() ||
2012 (nviews == 1 && base_view != display[0]))
2013 resize_display();
2014
2015 if (split && prev->lineno - prev->offset >= prev->height) {
2016 /* Take the title line into account. */
2017 int lines = prev->lineno - prev->offset - prev->height + 1;
2018
2019 /* Scroll the view that was split if the current line is
2020 * outside the new limited view. */
2021 do_scroll_view(prev, lines);
2022 }
2023
2024 if (prev && view != prev) {
2025 if (split && !backgrounded) {
2026 /* "Blur" the previous view. */
2027 update_view_title(prev);
2028 }
2029
2030 view->parent = prev;
2031 }
2032
2033 if (view->pipe && view->lines == 0) {
2034 /* Clear the old view and let the incremental updating refill
2035 * the screen. */
2036 wclear(view->win);
2037 report("");
2038 } else {
2039 redraw_view(view);
2040 report("");
2041 }
2042
2043 /* If the view is backgrounded the above calls to report()
2044 * won't redraw the view title. */
2045 if (backgrounded)
2046 update_view_title(view);
2047 }
2048
2049
2050 /*
2051 * User request switch noodle
2052 */
2053
2054 static int
2055 view_driver(struct view *view, enum request request)
2056 {
2057 int i;
2058
2059 switch (request) {
2060 case REQ_MOVE_UP:
2061 case REQ_MOVE_DOWN:
2062 case REQ_MOVE_PAGE_UP:
2063 case REQ_MOVE_PAGE_DOWN:
2064 case REQ_MOVE_FIRST_LINE:
2065 case REQ_MOVE_LAST_LINE:
2066 move_view(view, request);
2067 break;
2068
2069 case REQ_SCROLL_LINE_DOWN:
2070 case REQ_SCROLL_LINE_UP:
2071 case REQ_SCROLL_PAGE_DOWN:
2072 case REQ_SCROLL_PAGE_UP:
2073 scroll_view(view, request);
2074 break;
2075
2076 case REQ_VIEW_BLOB:
2077 if (!ref_blob[0]) {
2078 report("No file chosen, press 't' to open tree view");
2079 break;
2080 }
2081 /* Fall-through */
2082 case REQ_VIEW_MAIN:
2083 case REQ_VIEW_DIFF:
2084 case REQ_VIEW_LOG:
2085 case REQ_VIEW_TREE:
2086 case REQ_VIEW_HELP:
2087 case REQ_VIEW_PAGER:
2088 open_view(view, request, OPEN_DEFAULT);
2089 break;
2090
2091 case REQ_NEXT:
2092 case REQ_PREVIOUS:
2093 request = request == REQ_NEXT ? REQ_MOVE_DOWN : REQ_MOVE_UP;
2094
2095 if ((view == VIEW(REQ_VIEW_DIFF) &&
2096 view->parent == VIEW(REQ_VIEW_MAIN)) ||
2097 (view == VIEW(REQ_VIEW_BLOB) &&
2098 view->parent == VIEW(REQ_VIEW_TREE))) {
2099 view = view->parent;
2100 move_view(view, request);
2101 if (view_is_displayed(view))
2102 update_view_title(view);
2103 } else {
2104 move_view(view, request);
2105 break;
2106 }
2107 /* Fall-through */
2108
2109 case REQ_ENTER:
2110 if (!view->lines) {
2111 report("Nothing to enter");
2112 break;
2113 }
2114 return view->ops->enter(view, &view->line[view->lineno]);
2115
2116 case REQ_VIEW_NEXT:
2117 {
2118 int nviews = displayed_views();
2119 int next_view = (current_view + 1) % nviews;
2120
2121 if (next_view == current_view) {
2122 report("Only one view is displayed");
2123 break;
2124 }
2125
2126 current_view = next_view;
2127 /* Blur out the title of the previous view. */
2128 update_view_title(view);
2129 report("");
2130 break;
2131 }
2132 case REQ_TOGGLE_LINENO:
2133 opt_line_number = !opt_line_number;
2134 redraw_display();
2135 break;
2136
2137 case REQ_TOGGLE_REV_GRAPH:
2138 opt_rev_graph = !opt_rev_graph;
2139 redraw_display();
2140 break;
2141
2142 case REQ_PROMPT:
2143 /* Always reload^Wrerun commands from the prompt. */
2144 open_view(view, opt_request, OPEN_RELOAD);
2145 break;
2146
2147 case REQ_SEARCH:
2148 case REQ_SEARCH_BACK:
2149 search_view(view, request);
2150 break;
2151
2152 case REQ_FIND_NEXT:
2153 case REQ_FIND_PREV:
2154 find_next(view, request);
2155 break;
2156
2157 case REQ_STOP_LOADING:
2158 for (i = 0; i < ARRAY_SIZE(views); i++) {
2159 view = &views[i];
2160 if (view->pipe)
2161 report("Stopped loading the %s view", view->name),
2162 end_update(view);
2163 }
2164 break;
2165
2166 case REQ_SHOW_VERSION:
2167 report("%s (built %s)", VERSION, __DATE__);
2168 return TRUE;
2169
2170 case REQ_SCREEN_RESIZE:
2171 resize_display();
2172 /* Fall-through */
2173 case REQ_SCREEN_REDRAW:
2174 redraw_display();
2175 break;
2176
2177 case REQ_NONE:
2178 doupdate();
2179 return TRUE;
2180
2181 case REQ_VIEW_CLOSE:
2182 /* XXX: Mark closed views by letting view->parent point to the
2183 * view itself. Parents to closed view should never be
2184 * followed. */
2185 if (view->parent &&
2186 view->parent->parent != view->parent) {
2187 memset(display, 0, sizeof(display));
2188 current_view = 0;
2189 display[current_view] = view->parent;
2190 view->parent = view;
2191 resize_display();
2192 redraw_display();
2193 break;
2194 }
2195 /* Fall-through */
2196 case REQ_QUIT:
2197 return FALSE;
2198
2199 default:
2200 /* An unknown key will show most commonly used commands. */
2201 report("Unknown key, press 'h' for help");
2202 return TRUE;
2203 }
2204
2205 return TRUE;
2206 }
2207
2208
2209 /*
2210 * Pager backend
2211 */
2212
2213 static bool
2214 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2215 {
2216 char *text = line->data;
2217 enum line_type type = line->type;
2218 int textlen = strlen(text);
2219 int attr;
2220
2221 wmove(view->win, lineno, 0);
2222
2223 if (selected) {
2224 type = LINE_CURSOR;
2225 wchgat(view->win, -1, 0, type, NULL);
2226 }
2227
2228 attr = get_line_attr(type);
2229 wattrset(view->win, attr);
2230
2231 if (opt_line_number || opt_tab_size < TABSIZE) {
2232 static char spaces[] = " ";
2233 int col_offset = 0, col = 0;
2234
2235 if (opt_line_number) {
2236 unsigned long real_lineno = view->offset + lineno + 1;
2237
2238 if (real_lineno == 1 ||
2239 (real_lineno % opt_num_interval) == 0) {
2240 wprintw(view->win, "%.*d", view->digits, real_lineno);
2241
2242 } else {
2243 waddnstr(view->win, spaces,
2244 MIN(view->digits, STRING_SIZE(spaces)));
2245 }
2246 waddstr(view->win, ": ");
2247 col_offset = view->digits + 2;
2248 }
2249
2250 while (text && col_offset + col < view->width) {
2251 int cols_max = view->width - col_offset - col;
2252 char *pos = text;
2253 int cols;
2254
2255 if (*text == '\t') {
2256 text++;
2257 assert(sizeof(spaces) > TABSIZE);
2258 pos = spaces;
2259 cols = opt_tab_size - (col % opt_tab_size);
2260
2261 } else {
2262 text = strchr(text, '\t');
2263 cols = line ? text - pos : strlen(pos);
2264 }
2265
2266 waddnstr(view->win, pos, MIN(cols, cols_max));
2267 col += cols;
2268 }
2269
2270 } else {
2271 int col = 0, pos = 0;
2272
2273 for (; pos < textlen && col < view->width; pos++, col++)
2274 if (text[pos] == '\t')
2275 col += TABSIZE - (col % TABSIZE) - 1;
2276
2277 waddnstr(view->win, text, pos);
2278 }
2279
2280 return TRUE;
2281 }
2282
2283 static bool
2284 add_describe_ref(char *buf, size_t *bufpos, char *commit_id, const char *sep)
2285 {
2286 char refbuf[SIZEOF_STR];
2287 char *ref = NULL;
2288 FILE *pipe;
2289
2290 if (!string_format(refbuf, "git describe %s", commit_id))
2291 return TRUE;
2292
2293 pipe = popen(refbuf, "r");
2294 if (!pipe)
2295 return TRUE;
2296
2297 if ((ref = fgets(refbuf, sizeof(refbuf), pipe)))
2298 ref = chomp_string(ref);
2299 pclose(pipe);
2300
2301 if (!ref || !*ref)
2302 return TRUE;
2303
2304 /* This is the only fatal call, since it can "corrupt" the buffer. */
2305 if (!string_nformat(buf, SIZEOF_STR, bufpos, "%s%s", sep, ref))
2306 return FALSE;
2307
2308 return TRUE;
2309 }
2310
2311 static void
2312 add_pager_refs(struct view *view, struct line *line)
2313 {
2314 char buf[SIZEOF_STR];
2315 char *commit_id = line->data + STRING_SIZE("commit ");
2316 struct ref **refs;
2317 size_t bufpos = 0, refpos = 0;
2318 const char *sep = "Refs: ";
2319 bool is_tag = FALSE;
2320
2321 assert(line->type == LINE_COMMIT);
2322
2323 refs = get_refs(commit_id);
2324 if (!refs) {
2325 if (view == VIEW(REQ_VIEW_DIFF))
2326 goto try_add_describe_ref;
2327 return;
2328 }
2329
2330 do {
2331 struct ref *ref = refs[refpos];
2332 char *fmt = ref->tag ? "%s[%s]" : "%s%s";
2333
2334 if (!string_format_from(buf, &bufpos, fmt, sep, ref->name))
2335 return;
2336 sep = ", ";
2337 if (ref->tag)
2338 is_tag = TRUE;
2339 } while (refs[refpos++]->next);
2340
2341 if (!is_tag && view == VIEW(REQ_VIEW_DIFF)) {
2342 try_add_describe_ref:
2343 /* Add <tag>-g<commit_id> "fake" reference. */
2344 if (!add_describe_ref(buf, &bufpos, commit_id, sep))
2345 return;
2346 }
2347
2348 if (bufpos == 0)
2349 return;
2350
2351 if (!realloc_lines(view, view->line_size + 1))
2352 return;
2353
2354 line = &view->line[view->lines];
2355 line->data = strdup(buf);
2356 if (!line->data)
2357 return;
2358
2359 line->type = LINE_PP_REFS;
2360 view->lines++;
2361 }
2362
2363 static bool
2364 pager_read(struct view *view, char *data)
2365 {
2366 struct line *line = &view->line[view->lines];
2367
2368 line->data = strdup(data);
2369 if (!line->data)
2370 return FALSE;
2371
2372 line->type = get_line_type(line->data);
2373 view->lines++;
2374
2375 if (line->type == LINE_COMMIT &&
2376 (view == VIEW(REQ_VIEW_DIFF) ||
2377 view == VIEW(REQ_VIEW_LOG)))
2378 add_pager_refs(view, line);
2379
2380 return TRUE;
2381 }
2382
2383 static bool
2384 pager_enter(struct view *view, struct line *line)
2385 {
2386 int split = 0;
2387
2388 if (line->type == LINE_COMMIT &&
2389 (view == VIEW(REQ_VIEW_LOG) ||
2390 view == VIEW(REQ_VIEW_PAGER))) {
2391 open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT);
2392 split = 1;
2393 }
2394
2395 /* Always scroll the view even if it was split. That way
2396 * you can use Enter to scroll through the log view and
2397 * split open each commit diff. */
2398 scroll_view(view, REQ_SCROLL_LINE_DOWN);
2399
2400 /* FIXME: A minor workaround. Scrolling the view will call report("")
2401 * but if we are scrolling a non-current view this won't properly
2402 * update the view title. */
2403 if (split)
2404 update_view_title(view);
2405
2406 return TRUE;
2407 }
2408
2409 static bool
2410 pager_grep(struct view *view, struct line *line)
2411 {
2412 regmatch_t pmatch;
2413 char *text = line->data;
2414
2415 if (!*text)
2416 return FALSE;
2417
2418 if (regexec(view->regex, text, 1, &pmatch, 0) == REG_NOMATCH)
2419 return FALSE;
2420
2421 return TRUE;
2422 }
2423
2424 static void
2425 pager_select(struct view *view, struct line *line)
2426 {
2427 if (line->type == LINE_COMMIT) {
2428 char *text = line->data;
2429
2430 string_copy(view->ref, text + STRING_SIZE("commit "));
2431 string_copy(ref_commit, view->ref);
2432 }
2433 }
2434
2435 static struct view_ops pager_ops = {
2436 "line",
2437 pager_draw,
2438 pager_read,
2439 pager_enter,
2440 pager_grep,
2441 pager_select,
2442 };
2443
2444
2445 /*
2446 * Tree backend
2447 */
2448
2449 /* Parse output from git ls-tree:
2450 *
2451 * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26 Makefile
2452 * 100644 blob 5304ca4260aaddaee6498f9630e7d471b8591ea6 README
2453 * 100644 blob f931e1d229c3e185caad4449bf5b66ed72462657 tig.c
2454 * 100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38 web.conf
2455 */
2456
2457 #define SIZEOF_TREE_ATTR \
2458 STRING_SIZE("100644 blob ed09fe897f3c7c9af90bcf80cae92558ea88ae38\t")
2459
2460 #define TREE_UP_FORMAT "040000 tree %s\t.."
2461
2462 static int
2463 tree_compare_entry(enum line_type type1, char *name1,
2464 enum line_type type2, char *name2)
2465 {
2466 if (type1 != type2) {
2467 if (type1 == LINE_TREE_DIR)
2468 return -1;
2469 return 1;
2470 }
2471
2472 return strcmp(name1, name2);
2473 }
2474
2475 static bool
2476 tree_read(struct view *view, char *text)
2477 {
2478 size_t textlen = strlen(text);
2479 char buf[SIZEOF_STR];
2480 unsigned long pos;
2481 enum line_type type;
2482 bool first_read = view->lines == 0;
2483
2484 if (textlen <= SIZEOF_TREE_ATTR)
2485 return FALSE;
2486
2487 type = text[STRING_SIZE("100644 ")] == 't'
2488 ? LINE_TREE_DIR : LINE_TREE_FILE;
2489
2490 if (first_read) {
2491 /* Add path info line */
2492 if (string_format(buf, "Directory path /%s", opt_path) &&
2493 realloc_lines(view, view->line_size + 1) &&
2494 pager_read(view, buf))
2495 view->line[view->lines - 1].type = LINE_DEFAULT;
2496 else
2497 return FALSE;
2498
2499 /* Insert "link" to parent directory. */
2500 if (*opt_path &&
2501 string_format(buf, TREE_UP_FORMAT, view->ref) &&
2502 realloc_lines(view, view->line_size + 1) &&
2503 pager_read(view, buf))
2504 view->line[view->lines - 1].type = LINE_TREE_DIR;
2505 else if (*opt_path)
2506 return FALSE;
2507 }
2508
2509 /* Strip the path part ... */
2510 if (*opt_path) {
2511 size_t pathlen = textlen - SIZEOF_TREE_ATTR;
2512 size_t striplen = strlen(opt_path);
2513 char *path = text + SIZEOF_TREE_ATTR;
2514
2515 if (pathlen > striplen)
2516 memmove(path, path + striplen,
2517 pathlen - striplen + 1);
2518 }
2519
2520 /* Skip "Directory ..." and ".." line. */
2521 for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
2522 struct line *line = &view->line[pos];
2523 char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
2524 char *path2 = text + SIZEOF_TREE_ATTR;
2525 int cmp = tree_compare_entry(line->type, path1, type, path2);
2526
2527 if (cmp <= 0)
2528 continue;
2529
2530 text = strdup(text);
2531 if (!text)
2532 return FALSE;
2533
2534 if (view->lines > pos)
2535 memmove(&view->line[pos + 1], &view->line[pos],
2536 (view->lines - pos) * sizeof(*line));
2537
2538 line = &view->line[pos];
2539 line->data = text;
2540 line->type = type;
2541 view->lines++;
2542 return TRUE;
2543 }
2544
2545 if (!pager_read(view, text))
2546 return FALSE;
2547
2548 /* Move the current line to the first tree entry. */
2549 if (first_read)
2550 view->lineno++;
2551
2552 view->line[view->lines - 1].type = type;
2553 return TRUE;
2554 }
2555
2556 static bool
2557 tree_enter(struct view *view, struct line *line)
2558 {
2559 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2560 char *data = line->data;
2561 enum request request;
2562
2563 switch (line->type) {
2564 case LINE_TREE_DIR:
2565 /* Depending on whether it is a subdir or parent (updir?) link
2566 * mangle the path buffer. */
2567 if (line == &view->line[1] && *opt_path) {
2568 size_t path_len = strlen(opt_path);
2569 char *dirsep = opt_path + path_len - 1;
2570
2571 while (dirsep > opt_path && dirsep[-1] != '/')
2572 dirsep--;
2573
2574 dirsep[0] = 0;
2575
2576 } else {
2577 size_t pathlen = strlen(opt_path);
2578 size_t origlen = pathlen;
2579 char *basename = data + SIZEOF_TREE_ATTR;
2580
2581 if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
2582 opt_path[origlen] = 0;
2583 return TRUE;
2584 }
2585 }
2586
2587 /* Trees and subtrees share the same ID, so they are not not
2588 * unique like blobs. */
2589 flags |= OPEN_RELOAD;
2590 request = REQ_VIEW_TREE;
2591 break;
2592
2593 case LINE_TREE_FILE:
2594 request = REQ_VIEW_BLOB;
2595 break;
2596
2597 default:
2598 return TRUE;
2599 }
2600
2601 open_view(view, request, flags);
2602
2603 if (!VIEW(request)->pipe)
2604 return TRUE;
2605
2606 /* For tree views insert the path to the parent as the first line. */
2607 if (request == REQ_VIEW_BLOB) {
2608 /* Mirror what is showed in the title bar. */
2609 string_ncopy(ref_blob, data + STRING_SIZE("100644 blob "), 40);
2610 string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
2611 return TRUE;
2612 }
2613
2614 return TRUE;
2615 }
2616
2617 static void
2618 tree_select(struct view *view, struct line *line)
2619 {
2620 if (line->type == LINE_TREE_DIR || line->type == LINE_TREE_FILE) {
2621 char *text = line->data;
2622
2623 string_ncopy(view->ref, text + STRING_SIZE("100644 blob "), 40);
2624 string_copy(ref_blob, view->ref);
2625 }
2626 }
2627
2628 static struct view_ops tree_ops = {
2629 "file",
2630 pager_draw,
2631 tree_read,
2632 tree_enter,
2633 pager_grep,
2634 tree_select,
2635 };
2636
2637 static bool
2638 blob_read(struct view *view, char *line)
2639 {
2640 bool state = pager_read(view, line);
2641
2642 if (state == TRUE)
2643 view->line[view->lines - 1].type = LINE_DEFAULT;
2644
2645 return state;
2646 }
2647
2648 static struct view_ops blob_ops = {
2649 "line",
2650 pager_draw,
2651 blob_read,
2652 pager_enter,
2653 pager_grep,
2654 pager_select,
2655 };
2656
2657
2658 /*
2659 * Main view backend
2660 */
2661
2662 struct commit {
2663 char id[41]; /* SHA1 ID. */
2664 char title[75]; /* First line of the commit message. */
2665 char author[75]; /* Author of the commit. */
2666 struct tm time; /* Date from the author ident. */
2667 struct ref **refs; /* Repository references. */
2668 chtype graph[SIZEOF_REVGRAPH]; /* Ancestry chain graphics. */
2669 size_t graph_size; /* The width of the graph array. */
2670 };
2671
2672 static bool
2673 main_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
2674 {
2675 char buf[DATE_COLS + 1];
2676 struct commit *commit = line->data;
2677 enum line_type type;
2678 int col = 0;
2679 size_t timelen;
2680 size_t authorlen;
2681 int trimmed = 1;
2682
2683 if (!*commit->author)
2684 return FALSE;
2685
2686 wmove(view->win, lineno, col);
2687
2688 if (selected) {
2689 type = LINE_CURSOR;
2690 wattrset(view->win, get_line_attr(type));
2691 wchgat(view->win, -1, 0, type, NULL);
2692
2693 } else {
2694 type = LINE_MAIN_COMMIT;
2695 wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
2696 }
2697
2698 timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
2699 waddnstr(view->win, buf, timelen);
2700 waddstr(view->win, " ");
2701
2702 col += DATE_COLS;
2703 wmove(view->win, lineno, col);
2704 if (type != LINE_CURSOR)
2705 wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
2706
2707 if (opt_utf8) {
2708 authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
2709 } else {
2710 authorlen = strlen(commit->author);
2711 if (authorlen > AUTHOR_COLS - 2) {
2712 authorlen = AUTHOR_COLS - 2;
2713 trimmed = 1;
2714 }
2715 }
2716
2717 if (trimmed) {
2718 waddnstr(view->win, commit->author, authorlen);
2719 if (type != LINE_CURSOR)
2720 wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
2721 waddch(view->win, '~');
2722 } else {
2723 waddstr(view->win, commit->author);
2724 }
2725
2726 col += AUTHOR_COLS;
2727 if (type != LINE_CURSOR)
2728 wattrset(view->win, A_NORMAL);
2729
2730 if (opt_rev_graph && commit->graph_size) {
2731 size_t i;
2732
2733 wmove(view->win, lineno, col);
2734 /* Using waddch() instead of waddnstr() ensures that
2735 * they'll be rendered correctly for the cursor line. */
2736 for (i = 0; i < commit->graph_size; i++)
2737 waddch(view->win, commit->graph[i]);
2738
2739 col += commit->graph_size + 1;
2740 }
2741
2742 wmove(view->win, lineno, col);
2743
2744 if (commit->refs) {
2745 size_t i = 0;
2746
2747 do {
2748 if (type == LINE_CURSOR)
2749 ;
2750 else if (commit->refs[i]->tag)
2751 wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
2752 else
2753 wattrset(view->win, get_line_attr(LINE_MAIN_REF));
2754 waddstr(view->win, "[");
2755 waddstr(view->win, commit->refs[i]->name);
2756 waddstr(view->win, "]");
2757 if (type != LINE_CURSOR)
2758 wattrset(view->win, A_NORMAL);
2759 waddstr(view->win, " ");
2760 col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
2761 } while (commit->refs[i++]->next);
2762 }
2763
2764 if (type != LINE_CURSOR)
2765 wattrset(view->win, get_line_attr(type));
2766
2767 {
2768 int titlelen = strlen(commit->title);
2769
2770 if (col + titlelen > view->width)
2771 titlelen = view->width - col;
2772
2773 waddnstr(view->win, commit->title, titlelen);
2774 }
2775
2776 return TRUE;
2777 }
2778
2779 /* Reads git log --pretty=raw output and parses it into the commit struct. */
2780 static bool
2781 main_read(struct view *view, char *line)
2782 {
2783 enum line_type type = get_line_type(line);
2784 struct commit *commit = view->lines
2785 ? view->line[view->lines - 1].data : NULL;
2786
2787 switch (type) {
2788 case LINE_COMMIT:
2789 commit = calloc(1, sizeof(struct commit));
2790 if (!commit)
2791 return FALSE;
2792
2793 line += STRING_SIZE("commit ");
2794
2795 view->line[view->lines++].data = commit;
2796 string_copy(commit->id, line);
2797 commit->refs = get_refs(commit->id);
2798 commit->graph[commit->graph_size++] = ACS_LTEE;
2799 break;
2800
2801 case LINE_AUTHOR:
2802 {
2803 char *ident = line + STRING_SIZE("author ");
2804 char *end = strchr(ident, '<');
2805
2806 if (!commit)
2807 break;
2808
2809 if (end) {
2810 char *email = end + 1;
2811
2812 for (; end > ident && isspace(end[-1]); end--) ;
2813
2814 if (end == ident && *email) {
2815 ident = email;
2816 end = strchr(ident, '>');
2817 for (; end > ident && isspace(end[-1]); end--) ;
2818 }
2819 *end = 0;
2820 }
2821
2822 /* End is NULL or ident meaning there's no author. */
2823 if (end <= ident)
2824 ident = "Unknown";
2825
2826 string_copy(commit->author, ident);
2827
2828 /* Parse epoch and timezone */
2829 if (end) {
2830 char *secs = strchr(end + 1, '>');
2831 char *zone;
2832 time_t time;
2833
2834 if (!secs || secs[1] != ' ')
2835 break;
2836
2837 secs += 2;
2838 time = (time_t) atol(secs);
2839 zone = strchr(secs, ' ');
2840 if (zone && strlen(zone) == STRING_SIZE(" +0700")) {
2841 long tz;
2842
2843 zone++;
2844 tz = ('0' - zone[1]) * 60 * 60 * 10;
2845 tz += ('0' - zone[2]) * 60 * 60;
2846 tz += ('0' - zone[3]) * 60;
2847 tz += ('0' - zone[4]) * 60;
2848
2849 if (zone[0] == '-')
2850 tz = -tz;
2851
2852 time -= tz;
2853 }
2854 gmtime_r(&time, &commit->time);
2855 }
2856 break;
2857 }
2858 default:
2859 if (!commit)
2860 break;
2861
2862 /* Fill in the commit title if it has not already been set. */
2863 if (commit->title[0])
2864 break;
2865
2866 /* Require titles to start with a non-space character at the
2867 * offset used by git log. */
2868 /* FIXME: More gracefull handling of titles; append "..." to
2869 * shortened titles, etc. */
2870 if (strncmp(line, " ", 4) ||
2871 isspace(line[4]))
2872 break;
2873
2874 string_copy(commit->title, line + 4);
2875 }
2876
2877 return TRUE;
2878 }
2879
2880 static bool
2881 main_enter(struct view *view, struct line *line)
2882 {
2883 enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
2884
2885 open_view(view, REQ_VIEW_DIFF, flags);
2886 return TRUE;
2887 }
2888
2889 static bool
2890 main_grep(struct view *view, struct line *line)
2891 {
2892 struct commit *commit = line->data;
2893 enum { S_TITLE, S_AUTHOR, S_DATE, S_END } state;
2894 char buf[DATE_COLS + 1];
2895 regmatch_t pmatch;
2896
2897 for (state = S_TITLE; state < S_END; state++) {
2898 char *text;
2899
2900 switch (state) {
2901 case S_TITLE: text = commit->title; break;
2902 case S_AUTHOR: text = commit->author; break;
2903 case S_DATE:
2904 if (!strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time))
2905 continue;
2906 text = buf;
2907 break;
2908
2909 default:
2910 return FALSE;
2911 }
2912
2913 if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
2914 return TRUE;
2915 }
2916
2917 return FALSE;
2918 }
2919
2920 static void
2921 main_select(struct view *view, struct line *line)
2922 {
2923 struct commit *commit = line->data;
2924
2925 string_copy(view->ref, commit->id);
2926 string_copy(ref_commit, view->ref);
2927 }
2928
2929 static struct view_ops main_ops = {
2930 "commit",
2931 main_draw,
2932 main_read,
2933 main_enter,
2934 main_grep,
2935 main_select,
2936 };
2937
2938
2939 /*
2940 * Unicode / UTF-8 handling
2941 *
2942 * NOTE: Much of the following code for dealing with unicode is derived from
2943 * ELinks' UTF-8 code developed by Scrool <scroolik@gmail.com>. Origin file is
2944 * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28.
2945 */
2946
2947 /* I've (over)annotated a lot of code snippets because I am not entirely
2948 * confident that the approach taken by this small UTF-8 interface is correct.
2949 * --jonas */
2950
2951 static inline int
2952 unicode_width(unsigned long c)
2953 {
2954 if (c >= 0x1100 &&
2955 (c <= 0x115f /* Hangul Jamo */
2956 || c == 0x2329
2957 || c == 0x232a
2958 || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f)
2959 /* CJK ... Yi */
2960 || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
2961 || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
2962 || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
2963 || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */
2964 || (c >= 0xffe0 && c <= 0xffe6)
2965 || (c >= 0x20000 && c <= 0x2fffd)
2966 || (c >= 0x30000 && c <= 0x3fffd)))
2967 return 2;
2968
2969 return 1;
2970 }
2971
2972 /* Number of bytes used for encoding a UTF-8 character indexed by first byte.
2973 * Illegal bytes are set one. */
2974 static const unsigned char utf8_bytes[256] = {
2975 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2976 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2977 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2978 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2979 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2980 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
2981 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,
2982 3,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4, 5,5,5,5,6,6,1,1,
2983 };
2984
2985 /* Decode UTF-8 multi-byte representation into a unicode character. */
2986 static inline unsigned long
2987 utf8_to_unicode(const char *string, size_t length)
2988 {
2989 unsigned long unicode;
2990
2991 switch (length) {
2992 case 1:
2993 unicode = string[0];
2994 break;
2995 case 2:
2996 unicode = (string[0] & 0x1f) << 6;
2997 unicode += (string[1] & 0x3f);
2998 break;
2999 case 3:
3000 unicode = (string[0] & 0x0f) << 12;
3001 unicode += ((string[1] & 0x3f) << 6);
3002 unicode += (string[2] & 0x3f);
3003 break;
3004 case 4:
3005 unicode = (string[0] & 0x0f) << 18;
3006 unicode += ((string[1] & 0x3f) << 12);
3007 unicode += ((string[2] & 0x3f) << 6);
3008 unicode += (string[3] & 0x3f);
3009 break;
3010 case 5:
3011 unicode = (string[0] & 0x0f) << 24;
3012 unicode += ((string[1] & 0x3f) << 18);
3013 unicode += ((string[2] & 0x3f) << 12);
3014 unicode += ((string[3] & 0x3f) << 6);
3015 unicode += (string[4] & 0x3f);
3016 break;
3017 case 6:
3018 unicode = (string[0] & 0x01) << 30;
3019 unicode += ((string[1] & 0x3f) << 24);
3020 unicode += ((string[2] & 0x3f) << 18);
3021 unicode += ((string[3] & 0x3f) << 12);
3022 unicode += ((string[4] & 0x3f) << 6);
3023 unicode += (string[5] & 0x3f);
3024 break;
3025 default:
3026 die("Invalid unicode length");
3027 }
3028
3029 /* Invalid characters could return the special 0xfffd value but NUL
3030 * should be just as good. */
3031 return unicode > 0xffff ? 0 : unicode;
3032 }
3033
3034 /* Calculates how much of string can be shown within the given maximum width
3035 * and sets trimmed parameter to non-zero value if all of string could not be
3036 * shown.
3037 *
3038 * Additionally, adds to coloffset how many many columns to move to align with
3039 * the expected position. Takes into account how multi-byte and double-width
3040 * characters will effect the cursor position.
3041 *
3042 * Returns the number of bytes to output from string to satisfy max_width. */
3043 static size_t
3044 utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
3045 {
3046 const char *start = string;
3047 const char *end = strchr(string, '\0');
3048 size_t mbwidth = 0;
3049 size_t width = 0;
3050
3051 *trimmed = 0;
3052
3053 while (string < end) {
3054 int c = *(unsigned char *) string;
3055 unsigned char bytes = utf8_bytes[c];
3056 size_t ucwidth;
3057 unsigned long unicode;
3058
3059 if (string + bytes > end)
3060 break;
3061
3062 /* Change representation to figure out whether
3063 * it is a single- or double-width character. */
3064
3065 unicode = utf8_to_unicode(string, bytes);
3066 /* FIXME: Graceful handling of invalid unicode character. */
3067 if (!unicode)
3068 break;
3069
3070 ucwidth = unicode_width(unicode);
3071 width += ucwidth;
3072 if (width > max_width) {
3073 *trimmed = 1;
3074 break;
3075 }
3076
3077 /* The column offset collects the differences between the
3078 * number of bytes encoding a character and the number of
3079 * columns will be used for rendering said character.
3080 *
3081 * So if some character A is encoded in 2 bytes, but will be
3082 * represented on the screen using only 1 byte this will and up
3083 * adding 1 to the multi-byte column offset.
3084 *
3085 * Assumes that no double-width character can be encoding in
3086 * less than two bytes. */
3087 if (bytes > ucwidth)
3088 mbwidth += bytes - ucwidth;
3089
3090 string += bytes;
3091 }
3092
3093 *coloffset += mbwidth;
3094
3095 return string - start;
3096 }
3097
3098
3099 /*
3100 * Status management
3101 */
3102
3103 /* Whether or not the curses interface has been initialized. */
3104 static bool cursed = FALSE;
3105
3106 /* The status window is used for polling keystrokes. */
3107 static WINDOW *status_win;
3108
3109 /* Update status and title window. */
3110 static void
3111 report(const char *msg, ...)
3112 {
3113 static bool empty = TRUE;
3114 struct view *view = display[current_view];
3115
3116 if (!empty || *msg) {
3117 va_list args;
3118
3119 va_start(args, msg);
3120
3121 werase(status_win);
3122 wmove(status_win, 0, 0);
3123 if (*msg) {
3124 vwprintw(status_win, msg, args);
3125 empty = FALSE;
3126 } else {
3127 empty = TRUE;
3128 }
3129 wrefresh(status_win);
3130
3131 va_end(args);
3132 }
3133
3134 update_view_title(view);
3135 update_display_cursor();
3136 }
3137
3138 /* Controls when nodelay should be in effect when polling user input. */
3139 static void
3140 set_nonblocking_input(bool loading)
3141 {
3142 static unsigned int loading_views;
3143
3144 if ((loading == FALSE && loading_views-- == 1) ||
3145 (loading == TRUE && loading_views++ == 0))
3146 nodelay(status_win, loading);
3147 }
3148
3149 static void
3150 init_display(void)
3151 {
3152 int x, y;
3153
3154 /* Initialize the curses library */
3155 if (isatty(STDIN_FILENO)) {
3156 cursed = !!initscr();
3157 } else {
3158 /* Leave stdin and stdout alone when acting as a pager. */
3159 FILE *io = fopen("/dev/tty", "r+");
3160
3161 if (!io)
3162 die("Failed to open /dev/tty");
3163 cursed = !!newterm(NULL, io, io);
3164 }
3165
3166 if (!cursed)
3167 die("Failed to initialize curses");
3168
3169 nonl(); /* Tell curses not to do NL->CR/NL on output */
3170 cbreak(); /* Take input chars one at a time, no wait for \n */
3171 noecho(); /* Don't echo input */
3172 leaveok(stdscr, TRUE);
3173
3174 if (has_colors())
3175 init_colors();
3176
3177 getmaxyx(stdscr, y, x);
3178 status_win = newwin(1, 0, y - 1, 0);
3179 if (!status_win)
3180 die("Failed to create status window");
3181
3182 /* Enable keyboard mapping */
3183 keypad(status_win, TRUE);
3184 wbkgdset(status_win, get_line_attr(LINE_STATUS));
3185 }
3186
3187 static char *
3188 read_prompt(const char *prompt)
3189 {
3190 enum { READING, STOP, CANCEL } status = READING;
3191 static char buf[sizeof(opt_cmd) - STRING_SIZE("git \0")];
3192 int pos = 0;
3193
3194 while (status == READING) {
3195 struct view *view;
3196 int i, key;
3197
3198 foreach_view (view, i)
3199 update_view(view);
3200
3201 report("%s%.*s", prompt, pos, buf);
3202 /* Refresh, accept single keystroke of input */
3203 key = wgetch(status_win);
3204 switch (key) {
3205 case KEY_RETURN:
3206 case KEY_ENTER:
3207 case '\n':
3208 status = pos ? STOP : CANCEL;
3209 break;
3210
3211 case KEY_BACKSPACE:
3212 if (pos > 0)
3213 pos--;
3214 else
3215 status = CANCEL;
3216 break;
3217
3218 case KEY_ESC:
3219 status = CANCEL;
3220 break;
3221
3222 case ERR:
3223 break;
3224
3225 default:
3226 if (pos >= sizeof(buf)) {
3227 report("Input string too long");
3228 return NULL;
3229 }
3230
3231 if (isprint(key))
3232 buf[pos++] = (char) key;
3233 }
3234 }
3235
3236 if (status == CANCEL) {
3237 /* Clear the status window */
3238 report("");
3239 return NULL;
3240 }
3241
3242 buf[pos++] = 0;
3243
3244 return buf;
3245 }
3246
3247 /*
3248 * Repository references
3249 */
3250
3251 static struct ref *refs;
3252 static size_t refs_size;
3253
3254 /* Id <-> ref store */
3255 static struct ref ***id_refs;
3256 static size_t id_refs_size;
3257
3258 static struct ref **
3259 get_refs(char *id)
3260 {
3261 struct ref ***tmp_id_refs;
3262 struct ref **ref_list = NULL;
3263 size_t ref_list_size = 0;
3264 size_t i;
3265
3266 for (i = 0; i < id_refs_size; i++)
3267 if (!strcmp(id, id_refs[i][0]->id))
3268 return id_refs[i];
3269
3270 tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
3271 if (!tmp_id_refs)
3272 return NULL;
3273
3274 id_refs = tmp_id_refs;
3275
3276 for (i = 0; i < refs_size; i++) {
3277 struct ref **tmp;
3278
3279 if (strcmp(id, refs[i].id))
3280 continue;
3281
3282 tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
3283 if (!tmp) {
3284 if (ref_list)
3285 free(ref_list);
3286 return NULL;
3287 }
3288
3289 ref_list = tmp;
3290 if (ref_list_size > 0)
3291 ref_list[ref_list_size - 1]->next = 1;
3292 ref_list[ref_list_size] = &refs[i];
3293
3294 /* XXX: The properties of the commit chains ensures that we can
3295 * safely modify the shared ref. The repo references will
3296 * always be similar for the same id. */
3297 ref_list[ref_list_size]->next = 0;
3298 ref_list_size++;
3299 }
3300
3301 if (ref_list)
3302 id_refs[id_refs_size++] = ref_list;
3303
3304 return ref_list;
3305 }
3306
3307 static int
3308 read_ref(char *id, int idlen, char *name, int namelen)
3309 {
3310 struct ref *ref;
3311 bool tag = FALSE;
3312
3313 if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
3314 /* Commits referenced by tags has "^{}" appended. */
3315 if (name[namelen - 1] != '}')
3316 return OK;
3317
3318 while (namelen > 0 && name[namelen] != '^')
3319 namelen--;
3320
3321 tag = TRUE;
3322 namelen -= STRING_SIZE("refs/tags/");
3323 name += STRING_SIZE("refs/tags/");
3324
3325 } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
3326 namelen -= STRING_SIZE("refs/heads/");
3327 name += STRING_SIZE("refs/heads/");
3328
3329 } else if (!strcmp(name, "HEAD")) {
3330 return OK;
3331 }
3332
3333 refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
3334 if (!refs)
3335 return ERR;
3336
3337 ref = &refs[refs_size++];
3338 ref->name = malloc(namelen + 1);
3339 if (!ref->name)
3340 return ERR;
3341
3342 strncpy(ref->name, name, namelen);
3343 ref->name[namelen] = 0;
3344 ref->tag = tag;
3345 string_copy(ref->id, id);
3346
3347 return OK;
3348 }
3349
3350 static int
3351 load_refs(void)
3352 {
3353 const char *cmd_env = getenv("TIG_LS_REMOTE");
3354 const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE;
3355
3356 return read_properties(popen(cmd, "r"), "\t", read_ref);
3357 }
3358
3359 static int
3360 read_repo_config_option(char *name, int namelen, char *value, int valuelen)
3361 {
3362 if (!strcmp(name, "i18n.commitencoding"))
3363 string_copy(opt_encoding, value);
3364
3365 return OK;
3366 }
3367
3368 static int
3369 load_repo_config(void)
3370 {
3371 return read_properties(popen("git repo-config --list", "r"),
3372 "=", read_repo_config_option);
3373 }
3374
3375 static int
3376 read_properties(FILE *pipe, const char *separators,
3377 int (*read_property)(char *, int, char *, int))
3378 {
3379 char buffer[BUFSIZ];
3380 char *name;
3381 int state = OK;
3382
3383 if (!pipe)
3384 return ERR;
3385
3386 while (state == OK && (name = fgets(buffer, sizeof(buffer), pipe))) {
3387 char *value;
3388 size_t namelen;
3389 size_t valuelen;
3390
3391 name = chomp_string(name);
3392 namelen = strcspn(name, separators);
3393
3394 if (name[namelen]) {
3395 name[namelen] = 0;
3396 value = chomp_string(name + namelen + 1);
3397 valuelen = strlen(value);
3398
3399 } else {
3400 value = "";
3401 valuelen = 0;
3402 }
3403
3404 state = read_property(name, namelen, value, valuelen);
3405 }
3406
3407 if (state != ERR && ferror(pipe))
3408 state = ERR;
3409
3410 pclose(pipe);
3411
3412 return state;
3413 }
3414
3415
3416 /*
3417 * Main
3418 */
3419
3420 static void __NORETURN
3421 quit(int sig)
3422 {
3423 /* XXX: Restore tty modes and let the OS cleanup the rest! */
3424 if (cursed)
3425 endwin();
3426 exit(0);
3427 }
3428
3429 static void __NORETURN
3430 die(const char *err, ...)
3431 {
3432 va_list args;
3433
3434 endwin();
3435
3436 va_start(args, err);
3437 fputs("tig: ", stderr);
3438 vfprintf(stderr, err, args);
3439 fputs("\n", stderr);
3440 va_end(args);
3441
3442 exit(1);
3443 }
3444
3445 int
3446 main(int argc, char *argv[])
3447 {
3448 struct view *view;
3449 enum request request;
3450 size_t i;
3451
3452 signal(SIGINT, quit);
3453
3454 if (setlocale(LC_ALL, "")) {
3455 string_copy(opt_codeset, nl_langinfo(CODESET));
3456 }
3457
3458 if (load_options() == ERR)
3459 die("Failed to load user config.");
3460
3461 /* Load the repo config file so options can be overwritten from
3462 * the command line. */
3463 if (load_repo_config() == ERR)
3464 die("Failed to load repo config.");
3465
3466 if (!parse_options(argc, argv))
3467 return 0;
3468
3469 if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
3470 opt_iconv = iconv_open(opt_codeset, opt_encoding);
3471 if (opt_iconv == ICONV_NONE)
3472 die("Failed to initialize character set conversion");
3473 }
3474
3475 if (load_refs() == ERR)
3476 die("Failed to load refs.");
3477
3478 /* Require a git repository unless when running in pager mode. */
3479 if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
3480 die("Not a git repository");
3481
3482 for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
3483 view->cmd_env = getenv(view->cmd_env);
3484
3485 request = opt_request;
3486
3487 init_display();
3488
3489 while (view_driver(display[current_view], request)) {
3490 int key;
3491 int i;
3492
3493 foreach_view (view, i)
3494 update_view(view);
3495
3496 /* Refresh, accept single keystroke of input */
3497 key = wgetch(status_win);
3498
3499 request = get_keybinding(display[current_view]->keymap, key);
3500
3501 /* Some low-level request handling. This keeps access to
3502 * status_win restricted. */
3503 switch (request) {
3504 case REQ_PROMPT:
3505 {
3506 char *cmd = read_prompt(":");
3507
3508 if (cmd && string_format(opt_cmd, "git %s", cmd)) {
3509 if (strncmp(cmd, "show", 4) && isspace(cmd[4])) {
3510 opt_request = REQ_VIEW_DIFF;
3511 } else {
3512 opt_request = REQ_VIEW_PAGER;
3513 }
3514 break;
3515 }
3516
3517 request = REQ_NONE;
3518 break;
3519 }
3520 case REQ_SEARCH:
3521 case REQ_SEARCH_BACK:
3522 {
3523 const char *prompt = request == REQ_SEARCH
3524 ? "/" : "?";
3525 char *search = read_prompt(prompt);
3526
3527 if (search)
3528 string_copy(opt_search, search);
3529 else
3530 request = REQ_NONE;
3531 break;
3532 }
3533 case REQ_SCREEN_RESIZE:
3534 {
3535 int height, width;
3536
3537 getmaxyx(stdscr, height, width);
3538
3539 /* Resize the status view and let the view driver take
3540 * care of resizing the displayed views. */
3541 wresize(status_win, 1, width);
3542 mvwin(status_win, height - 1, 0);
3543 wrefresh(status_win);
3544 break;
3545 }
3546 default:
3547 break;
3548 }
3549 }
3550
3551 quit(0);
3552
3553 return 0;
3554 }
Full-screen terminal Git browser.