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