list_commands: only call git_exec_path if it is needed
[git] / builtin-rev-parse.c
1 /*
2  * rev-parse.c
3  *
4  * Copyright (C) Linus Torvalds, 2005
5  */
6 #include "cache.h"
7 #include "commit.h"
8 #include "refs.h"
9 #include "quote.h"
10 #include "builtin.h"
11 #include "parse-options.h"
12
13 #define DO_REVS         1
14 #define DO_NOREV        2
15 #define DO_FLAGS        4
16 #define DO_NONFLAGS     8
17 static int filter = ~0;
18
19 static const char *def;
20
21 #define NORMAL 0
22 #define REVERSED 1
23 static int show_type = NORMAL;
24
25 #define SHOW_SYMBOLIC_ASIS 1
26 #define SHOW_SYMBOLIC_FULL 2
27 static int symbolic;
28 static int abbrev;
29 static int output_sq;
30
31 /*
32  * Some arguments are relevant "revision" arguments,
33  * others are about output format or other details.
34  * This sorts it all out.
35  */
36 static int is_rev_argument(const char *arg)
37 {
38         static const char *rev_args[] = {
39                 "--all",
40                 "--bisect",
41                 "--dense",
42                 "--branches",
43                 "--header",
44                 "--max-age=",
45                 "--max-count=",
46                 "--min-age=",
47                 "--no-merges",
48                 "--objects",
49                 "--objects-edge",
50                 "--parents",
51                 "--pretty",
52                 "--remotes",
53                 "--sparse",
54                 "--tags",
55                 "--topo-order",
56                 "--date-order",
57                 "--unpacked",
58                 NULL
59         };
60         const char **p = rev_args;
61
62         /* accept -<digit>, like traditional "head" */
63         if ((*arg == '-') && isdigit(arg[1]))
64                 return 1;
65
66         for (;;) {
67                 const char *str = *p++;
68                 int len;
69                 if (!str)
70                         return 0;
71                 len = strlen(str);
72                 if (!strcmp(arg, str) ||
73                     (str[len-1] == '=' && !strncmp(arg, str, len)))
74                         return 1;
75         }
76 }
77
78 /* Output argument as a string, either SQ or normal */
79 static void show(const char *arg)
80 {
81         if (output_sq) {
82                 int sq = '\'', ch;
83
84                 putchar(sq);
85                 while ((ch = *arg++)) {
86                         if (ch == sq)
87                                 fputs("'\\'", stdout);
88                         putchar(ch);
89                 }
90                 putchar(sq);
91                 putchar(' ');
92         }
93         else
94                 puts(arg);
95 }
96
97 /* Like show(), but with a negation prefix according to type */
98 static void show_with_type(int type, const char *arg)
99 {
100         if (type != show_type)
101                 putchar('^');
102         show(arg);
103 }
104
105 /* Output a revision, only if filter allows it */
106 static void show_rev(int type, const unsigned char *sha1, const char *name)
107 {
108         if (!(filter & DO_REVS))
109                 return;
110         def = NULL;
111
112         if (symbolic && name) {
113                 if (symbolic == SHOW_SYMBOLIC_FULL) {
114                         unsigned char discard[20];
115                         char *full;
116
117                         switch (dwim_ref(name, strlen(name), discard, &full)) {
118                         case 0:
119                                 /*
120                                  * Not found -- not a ref.  We could
121                                  * emit "name" here, but symbolic-full
122                                  * users are interested in finding the
123                                  * refs spelled in full, and they would
124                                  * need to filter non-refs if we did so.
125                                  */
126                                 break;
127                         case 1: /* happy */
128                                 show_with_type(type, full);
129                                 break;
130                         default: /* ambiguous */
131                                 error("refname '%s' is ambiguous", name);
132                                 break;
133                         }
134                 } else {
135                         show_with_type(type, name);
136                 }
137         }
138         else if (abbrev)
139                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
140         else
141                 show_with_type(type, sha1_to_hex(sha1));
142 }
143
144 /* Output a flag, only if filter allows it. */
145 static int show_flag(const char *arg)
146 {
147         if (!(filter & DO_FLAGS))
148                 return 0;
149         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
150                 show(arg);
151                 return 1;
152         }
153         return 0;
154 }
155
156 static int show_default(void)
157 {
158         const char *s = def;
159
160         if (s) {
161                 unsigned char sha1[20];
162
163                 def = NULL;
164                 if (!get_sha1(s, sha1)) {
165                         show_rev(NORMAL, sha1, s);
166                         return 1;
167                 }
168         }
169         return 0;
170 }
171
172 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
173 {
174         show_rev(NORMAL, sha1, refname);
175         return 0;
176 }
177
178 static void show_datestring(const char *flag, const char *datestr)
179 {
180         static char buffer[100];
181
182         /* date handling requires both flags and revs */
183         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
184                 return;
185         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
186         show(buffer);
187 }
188
189 static int show_file(const char *arg)
190 {
191         show_default();
192         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
193                 show(arg);
194                 return 1;
195         }
196         return 0;
197 }
198
199 static int try_difference(const char *arg)
200 {
201         char *dotdot;
202         unsigned char sha1[20];
203         unsigned char end[20];
204         const char *next;
205         const char *this;
206         int symmetric;
207
208         if (!(dotdot = strstr(arg, "..")))
209                 return 0;
210         next = dotdot + 2;
211         this = arg;
212         symmetric = (*next == '.');
213
214         *dotdot = 0;
215         next += symmetric;
216
217         if (!*next)
218                 next = "HEAD";
219         if (dotdot == arg)
220                 this = "HEAD";
221         if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
222                 show_rev(NORMAL, end, next);
223                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
224                 if (symmetric) {
225                         struct commit_list *exclude;
226                         struct commit *a, *b;
227                         a = lookup_commit_reference(sha1);
228                         b = lookup_commit_reference(end);
229                         exclude = get_merge_bases(a, b, 1);
230                         while (exclude) {
231                                 struct commit_list *n = exclude->next;
232                                 show_rev(REVERSED,
233                                          exclude->item->object.sha1,NULL);
234                                 free(exclude);
235                                 exclude = n;
236                         }
237                 }
238                 return 1;
239         }
240         *dotdot = '.';
241         return 0;
242 }
243
244 static int try_parent_shorthands(const char *arg)
245 {
246         char *dotdot;
247         unsigned char sha1[20];
248         struct commit *commit;
249         struct commit_list *parents;
250         int parents_only;
251
252         if ((dotdot = strstr(arg, "^!")))
253                 parents_only = 0;
254         else if ((dotdot = strstr(arg, "^@")))
255                 parents_only = 1;
256
257         if (!dotdot || dotdot[2])
258                 return 0;
259
260         *dotdot = 0;
261         if (get_sha1(arg, sha1))
262                 return 0;
263
264         if (!parents_only)
265                 show_rev(NORMAL, sha1, arg);
266         commit = lookup_commit_reference(sha1);
267         for (parents = commit->parents; parents; parents = parents->next)
268                 show_rev(parents_only ? NORMAL : REVERSED,
269                                 parents->item->object.sha1, arg);
270
271         return 1;
272 }
273
274 static int parseopt_dump(const struct option *o, const char *arg, int unset)
275 {
276         struct strbuf *parsed = o->value;
277         if (unset)
278                 strbuf_addf(parsed, " --no-%s", o->long_name);
279         else if (o->short_name)
280                 strbuf_addf(parsed, " -%c", o->short_name);
281         else
282                 strbuf_addf(parsed, " --%s", o->long_name);
283         if (arg) {
284                 strbuf_addch(parsed, ' ');
285                 sq_quote_buf(parsed, arg);
286         }
287         return 0;
288 }
289
290 static const char *skipspaces(const char *s)
291 {
292         while (isspace(*s))
293                 s++;
294         return s;
295 }
296
297 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
298 {
299         static int keep_dashdash = 0;
300         static char const * const parseopt_usage[] = {
301                 "git rev-parse --parseopt [options] -- [<args>...]",
302                 NULL
303         };
304         static struct option parseopt_opts[] = {
305                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
306                                         "keep the `--` passed as an arg"),
307                 OPT_END(),
308         };
309
310         struct strbuf sb, parsed;
311         const char **usage = NULL;
312         struct option *opts = NULL;
313         int onb = 0, osz = 0, unb = 0, usz = 0;
314
315         strbuf_init(&parsed, 0);
316         strbuf_addstr(&parsed, "set --");
317         argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
318                              PARSE_OPT_KEEP_DASHDASH);
319         if (argc < 1 || strcmp(argv[0], "--"))
320                 usage_with_options(parseopt_usage, parseopt_opts);
321
322         strbuf_init(&sb, 0);
323         /* get the usage up to the first line with a -- on it */
324         for (;;) {
325                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
326                         die("premature end of input");
327                 ALLOC_GROW(usage, unb + 1, usz);
328                 if (!strcmp("--", sb.buf)) {
329                         if (unb < 1)
330                                 die("no usage string given before the `--' separator");
331                         usage[unb] = NULL;
332                         break;
333                 }
334                 usage[unb++] = strbuf_detach(&sb, NULL);
335         }
336
337         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
338         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
339                 const char *s;
340                 struct option *o;
341
342                 if (!sb.len)
343                         continue;
344
345                 ALLOC_GROW(opts, onb + 1, osz);
346                 memset(opts + onb, 0, sizeof(opts[onb]));
347
348                 o = &opts[onb++];
349                 s = strchr(sb.buf, ' ');
350                 if (!s || *sb.buf == ' ') {
351                         o->type = OPTION_GROUP;
352                         o->help = xstrdup(skipspaces(sb.buf));
353                         continue;
354                 }
355
356                 o->type = OPTION_CALLBACK;
357                 o->help = xstrdup(skipspaces(s));
358                 o->value = &parsed;
359                 o->flags = PARSE_OPT_NOARG;
360                 o->callback = &parseopt_dump;
361                 while (s > sb.buf && strchr("*=?!", s[-1])) {
362                         switch (*--s) {
363                         case '=':
364                                 o->flags &= ~PARSE_OPT_NOARG;
365                                 break;
366                         case '?':
367                                 o->flags &= ~PARSE_OPT_NOARG;
368                                 o->flags |= PARSE_OPT_OPTARG;
369                                 break;
370                         case '!':
371                                 o->flags |= PARSE_OPT_NONEG;
372                                 break;
373                         case '*':
374                                 o->flags |= PARSE_OPT_HIDDEN;
375                                 break;
376                         }
377                 }
378
379                 if (s - sb.buf == 1) /* short option only */
380                         o->short_name = *sb.buf;
381                 else if (sb.buf[1] != ',') /* long option only */
382                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
383                 else {
384                         o->short_name = *sb.buf;
385                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
386                 }
387         }
388         strbuf_release(&sb);
389
390         /* put an OPT_END() */
391         ALLOC_GROW(opts, onb + 1, osz);
392         memset(opts + onb, 0, sizeof(opts[onb]));
393         argc = parse_options(argc, argv, opts, usage,
394                              keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
395
396         strbuf_addf(&parsed, " --");
397         sq_quote_argv(&parsed, argv, 0);
398         puts(parsed.buf);
399         return 0;
400 }
401
402 static void die_no_single_rev(int quiet)
403 {
404         if (quiet)
405                 exit(1);
406         else
407                 die("Needed a single revision");
408 }
409
410 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
411 {
412         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
413         unsigned char sha1[20];
414         const char *name = NULL;
415
416         if (argc > 1 && !strcmp("--parseopt", argv[1]))
417                 return cmd_parseopt(argc - 1, argv + 1, prefix);
418
419         prefix = setup_git_directory();
420         git_config(git_default_config, NULL);
421         for (i = 1; i < argc; i++) {
422                 const char *arg = argv[i];
423
424                 if (as_is) {
425                         if (show_file(arg) && as_is < 2)
426                                 verify_filename(prefix, arg);
427                         continue;
428                 }
429                 if (!strcmp(arg,"-n")) {
430                         if (++i >= argc)
431                                 die("-n requires an argument");
432                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
433                                 show(arg);
434                                 show(argv[i]);
435                         }
436                         continue;
437                 }
438                 if (!prefixcmp(arg, "-n")) {
439                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
440                                 show(arg);
441                         continue;
442                 }
443
444                 if (*arg == '-') {
445                         if (!strcmp(arg, "--")) {
446                                 as_is = 2;
447                                 /* Pass on the "--" if we show anything but files.. */
448                                 if (filter & (DO_FLAGS | DO_REVS))
449                                         show_file(arg);
450                                 continue;
451                         }
452                         if (!strcmp(arg, "--default")) {
453                                 def = argv[i+1];
454                                 i++;
455                                 continue;
456                         }
457                         if (!strcmp(arg, "--revs-only")) {
458                                 filter &= ~DO_NOREV;
459                                 continue;
460                         }
461                         if (!strcmp(arg, "--no-revs")) {
462                                 filter &= ~DO_REVS;
463                                 continue;
464                         }
465                         if (!strcmp(arg, "--flags")) {
466                                 filter &= ~DO_NONFLAGS;
467                                 continue;
468                         }
469                         if (!strcmp(arg, "--no-flags")) {
470                                 filter &= ~DO_FLAGS;
471                                 continue;
472                         }
473                         if (!strcmp(arg, "--verify")) {
474                                 filter &= ~(DO_FLAGS|DO_NOREV);
475                                 verify = 1;
476                                 continue;
477                         }
478                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
479                                 quiet = 1;
480                                 continue;
481                         }
482                         if (!strcmp(arg, "--short") ||
483                             !prefixcmp(arg, "--short=")) {
484                                 filter &= ~(DO_FLAGS|DO_NOREV);
485                                 verify = 1;
486                                 abbrev = DEFAULT_ABBREV;
487                                 if (arg[7] == '=')
488                                         abbrev = strtoul(arg + 8, NULL, 10);
489                                 if (abbrev < MINIMUM_ABBREV)
490                                         abbrev = MINIMUM_ABBREV;
491                                 else if (40 <= abbrev)
492                                         abbrev = 40;
493                                 continue;
494                         }
495                         if (!strcmp(arg, "--sq")) {
496                                 output_sq = 1;
497                                 continue;
498                         }
499                         if (!strcmp(arg, "--not")) {
500                                 show_type ^= REVERSED;
501                                 continue;
502                         }
503                         if (!strcmp(arg, "--symbolic")) {
504                                 symbolic = SHOW_SYMBOLIC_ASIS;
505                                 continue;
506                         }
507                         if (!strcmp(arg, "--symbolic-full-name")) {
508                                 symbolic = SHOW_SYMBOLIC_FULL;
509                                 continue;
510                         }
511                         if (!strcmp(arg, "--all")) {
512                                 for_each_ref(show_reference, NULL);
513                                 continue;
514                         }
515                         if (!strcmp(arg, "--branches")) {
516                                 for_each_branch_ref(show_reference, NULL);
517                                 continue;
518                         }
519                         if (!strcmp(arg, "--tags")) {
520                                 for_each_tag_ref(show_reference, NULL);
521                                 continue;
522                         }
523                         if (!strcmp(arg, "--remotes")) {
524                                 for_each_remote_ref(show_reference, NULL);
525                                 continue;
526                         }
527                         if (!strcmp(arg, "--show-prefix")) {
528                                 if (prefix)
529                                         puts(prefix);
530                                 continue;
531                         }
532                         if (!strcmp(arg, "--show-cdup")) {
533                                 const char *pfx = prefix;
534                                 if (!is_inside_work_tree()) {
535                                         const char *work_tree =
536                                                 get_git_work_tree();
537                                         if (work_tree)
538                                                 printf("%s\n", work_tree);
539                                         continue;
540                                 }
541                                 while (pfx) {
542                                         pfx = strchr(pfx, '/');
543                                         if (pfx) {
544                                                 pfx++;
545                                                 printf("../");
546                                         }
547                                 }
548                                 putchar('\n');
549                                 continue;
550                         }
551                         if (!strcmp(arg, "--git-dir")) {
552                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
553                                 static char cwd[PATH_MAX];
554                                 if (gitdir) {
555                                         puts(gitdir);
556                                         continue;
557                                 }
558                                 if (!prefix) {
559                                         puts(".git");
560                                         continue;
561                                 }
562                                 if (!getcwd(cwd, PATH_MAX))
563                                         die("unable to get current working directory");
564                                 printf("%s/.git\n", cwd);
565                                 continue;
566                         }
567                         if (!strcmp(arg, "--is-inside-git-dir")) {
568                                 printf("%s\n", is_inside_git_dir() ? "true"
569                                                 : "false");
570                                 continue;
571                         }
572                         if (!strcmp(arg, "--is-inside-work-tree")) {
573                                 printf("%s\n", is_inside_work_tree() ? "true"
574                                                 : "false");
575                                 continue;
576                         }
577                         if (!strcmp(arg, "--is-bare-repository")) {
578                                 printf("%s\n", is_bare_repository() ? "true"
579                                                 : "false");
580                                 continue;
581                         }
582                         if (!prefixcmp(arg, "--since=")) {
583                                 show_datestring("--max-age=", arg+8);
584                                 continue;
585                         }
586                         if (!prefixcmp(arg, "--after=")) {
587                                 show_datestring("--max-age=", arg+8);
588                                 continue;
589                         }
590                         if (!prefixcmp(arg, "--before=")) {
591                                 show_datestring("--min-age=", arg+9);
592                                 continue;
593                         }
594                         if (!prefixcmp(arg, "--until=")) {
595                                 show_datestring("--min-age=", arg+8);
596                                 continue;
597                         }
598                         if (show_flag(arg) && verify)
599                                 die_no_single_rev(quiet);
600                         continue;
601                 }
602
603                 /* Not a flag argument */
604                 if (try_difference(arg))
605                         continue;
606                 if (try_parent_shorthands(arg))
607                         continue;
608                 name = arg;
609                 type = NORMAL;
610                 if (*arg == '^') {
611                         name++;
612                         type = REVERSED;
613                 }
614                 if (!get_sha1(name, sha1)) {
615                         if (verify)
616                                 revs_count++;
617                         else
618                                 show_rev(type, sha1, name);
619                         continue;
620                 }
621                 if (verify)
622                         die_no_single_rev(quiet);
623                 as_is = 1;
624                 if (!show_file(arg))
625                         continue;
626                 verify_filename(prefix, arg);
627         }
628         if (verify) {
629                 if (revs_count == 1) {
630                         show_rev(type, sha1, name);
631                         return 0;
632                 } else if (revs_count == 0 && show_default())
633                         return 0;
634                 die_no_single_rev(quiet);
635         } else
636                 show_default();
637         return 0;
638 }