git-instaweb: improve auto-discovery of httpd and call conventions.
[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 parseopt_dump(const struct option *o, const char *arg, int unset)
245 {
246         struct strbuf *parsed = o->value;
247         if (unset)
248                 strbuf_addf(parsed, " --no-%s", o->long_name);
249         else if (o->short_name)
250                 strbuf_addf(parsed, " -%c", o->short_name);
251         else
252                 strbuf_addf(parsed, " --%s", o->long_name);
253         if (arg) {
254                 strbuf_addch(parsed, ' ');
255                 sq_quote_buf(parsed, arg);
256         }
257         return 0;
258 }
259
260 static const char *skipspaces(const char *s)
261 {
262         while (isspace(*s))
263                 s++;
264         return s;
265 }
266
267 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
268 {
269         static int keep_dashdash = 0;
270         static char const * const parseopt_usage[] = {
271                 "git-rev-parse --parseopt [options] -- [<args>...]",
272                 NULL
273         };
274         static struct option parseopt_opts[] = {
275                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
276                                         "keep the `--` passed as an arg"),
277                 OPT_END(),
278         };
279
280         struct strbuf sb, parsed;
281         const char **usage = NULL;
282         struct option *opts = NULL;
283         int onb = 0, osz = 0, unb = 0, usz = 0;
284
285         strbuf_init(&parsed, 0);
286         strbuf_addstr(&parsed, "set --");
287         argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
288                              PARSE_OPT_KEEP_DASHDASH);
289         if (argc < 1 || strcmp(argv[0], "--"))
290                 usage_with_options(parseopt_usage, parseopt_opts);
291
292         strbuf_init(&sb, 0);
293         /* get the usage up to the first line with a -- on it */
294         for (;;) {
295                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
296                         die("premature end of input");
297                 ALLOC_GROW(usage, unb + 1, usz);
298                 if (!strcmp("--", sb.buf)) {
299                         if (unb < 1)
300                                 die("no usage string given before the `--' separator");
301                         usage[unb] = NULL;
302                         break;
303                 }
304                 usage[unb++] = strbuf_detach(&sb, NULL);
305         }
306
307         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
308         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
309                 const char *s;
310                 struct option *o;
311
312                 if (!sb.len)
313                         continue;
314
315                 ALLOC_GROW(opts, onb + 1, osz);
316                 memset(opts + onb, 0, sizeof(opts[onb]));
317
318                 o = &opts[onb++];
319                 s = strchr(sb.buf, ' ');
320                 if (!s || *sb.buf == ' ') {
321                         o->type = OPTION_GROUP;
322                         o->help = xstrdup(skipspaces(sb.buf));
323                         continue;
324                 }
325
326                 o->type = OPTION_CALLBACK;
327                 o->help = xstrdup(skipspaces(s));
328                 o->value = &parsed;
329                 o->flags = PARSE_OPT_NOARG;
330                 o->callback = &parseopt_dump;
331                 while (s > sb.buf && strchr("*=?!", s[-1])) {
332                         switch (*--s) {
333                         case '=':
334                                 o->flags &= ~PARSE_OPT_NOARG;
335                                 break;
336                         case '?':
337                                 o->flags &= ~PARSE_OPT_NOARG;
338                                 o->flags |= PARSE_OPT_OPTARG;
339                                 break;
340                         case '!':
341                                 o->flags |= PARSE_OPT_NONEG;
342                                 break;
343                         case '*':
344                                 o->flags |= PARSE_OPT_HIDDEN;
345                                 break;
346                         }
347                 }
348
349                 if (s - sb.buf == 1) /* short option only */
350                         o->short_name = *sb.buf;
351                 else if (sb.buf[1] != ',') /* long option only */
352                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
353                 else {
354                         o->short_name = *sb.buf;
355                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
356                 }
357         }
358         strbuf_release(&sb);
359
360         /* put an OPT_END() */
361         ALLOC_GROW(opts, onb + 1, osz);
362         memset(opts + onb, 0, sizeof(opts[onb]));
363         argc = parse_options(argc, argv, opts, usage,
364                              keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
365
366         strbuf_addf(&parsed, " --");
367         sq_quote_argv(&parsed, argv, 0);
368         puts(parsed.buf);
369         return 0;
370 }
371
372 static void die_no_single_rev(int quiet)
373 {
374         if (quiet)
375                 exit(1);
376         else
377                 die("Needed a single revision");
378 }
379
380 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
381 {
382         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
383         unsigned char sha1[20];
384         const char *name = NULL;
385
386         if (argc > 1 && !strcmp("--parseopt", argv[1]))
387                 return cmd_parseopt(argc - 1, argv + 1, prefix);
388
389         prefix = setup_git_directory();
390         git_config(git_default_config, NULL);
391         for (i = 1; i < argc; i++) {
392                 const char *arg = argv[i];
393
394                 if (as_is) {
395                         if (show_file(arg) && as_is < 2)
396                                 verify_filename(prefix, arg);
397                         continue;
398                 }
399                 if (!strcmp(arg,"-n")) {
400                         if (++i >= argc)
401                                 die("-n requires an argument");
402                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
403                                 show(arg);
404                                 show(argv[i]);
405                         }
406                         continue;
407                 }
408                 if (!prefixcmp(arg, "-n")) {
409                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
410                                 show(arg);
411                         continue;
412                 }
413
414                 if (*arg == '-') {
415                         if (!strcmp(arg, "--")) {
416                                 as_is = 2;
417                                 /* Pass on the "--" if we show anything but files.. */
418                                 if (filter & (DO_FLAGS | DO_REVS))
419                                         show_file(arg);
420                                 continue;
421                         }
422                         if (!strcmp(arg, "--default")) {
423                                 def = argv[i+1];
424                                 i++;
425                                 continue;
426                         }
427                         if (!strcmp(arg, "--revs-only")) {
428                                 filter &= ~DO_NOREV;
429                                 continue;
430                         }
431                         if (!strcmp(arg, "--no-revs")) {
432                                 filter &= ~DO_REVS;
433                                 continue;
434                         }
435                         if (!strcmp(arg, "--flags")) {
436                                 filter &= ~DO_NONFLAGS;
437                                 continue;
438                         }
439                         if (!strcmp(arg, "--no-flags")) {
440                                 filter &= ~DO_FLAGS;
441                                 continue;
442                         }
443                         if (!strcmp(arg, "--verify")) {
444                                 filter &= ~(DO_FLAGS|DO_NOREV);
445                                 verify = 1;
446                                 continue;
447                         }
448                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
449                                 quiet = 1;
450                                 continue;
451                         }
452                         if (!strcmp(arg, "--short") ||
453                             !prefixcmp(arg, "--short=")) {
454                                 filter &= ~(DO_FLAGS|DO_NOREV);
455                                 verify = 1;
456                                 abbrev = DEFAULT_ABBREV;
457                                 if (arg[7] == '=')
458                                         abbrev = strtoul(arg + 8, NULL, 10);
459                                 if (abbrev < MINIMUM_ABBREV)
460                                         abbrev = MINIMUM_ABBREV;
461                                 else if (40 <= abbrev)
462                                         abbrev = 40;
463                                 continue;
464                         }
465                         if (!strcmp(arg, "--sq")) {
466                                 output_sq = 1;
467                                 continue;
468                         }
469                         if (!strcmp(arg, "--not")) {
470                                 show_type ^= REVERSED;
471                                 continue;
472                         }
473                         if (!strcmp(arg, "--symbolic")) {
474                                 symbolic = SHOW_SYMBOLIC_ASIS;
475                                 continue;
476                         }
477                         if (!strcmp(arg, "--symbolic-full-name")) {
478                                 symbolic = SHOW_SYMBOLIC_FULL;
479                                 continue;
480                         }
481                         if (!strcmp(arg, "--all")) {
482                                 for_each_ref(show_reference, NULL);
483                                 continue;
484                         }
485                         if (!strcmp(arg, "--branches")) {
486                                 for_each_branch_ref(show_reference, NULL);
487                                 continue;
488                         }
489                         if (!strcmp(arg, "--tags")) {
490                                 for_each_tag_ref(show_reference, NULL);
491                                 continue;
492                         }
493                         if (!strcmp(arg, "--remotes")) {
494                                 for_each_remote_ref(show_reference, NULL);
495                                 continue;
496                         }
497                         if (!strcmp(arg, "--show-prefix")) {
498                                 if (prefix)
499                                         puts(prefix);
500                                 continue;
501                         }
502                         if (!strcmp(arg, "--show-cdup")) {
503                                 const char *pfx = prefix;
504                                 if (!is_inside_work_tree()) {
505                                         const char *work_tree =
506                                                 get_git_work_tree();
507                                         if (work_tree)
508                                                 printf("%s\n", work_tree);
509                                         continue;
510                                 }
511                                 while (pfx) {
512                                         pfx = strchr(pfx, '/');
513                                         if (pfx) {
514                                                 pfx++;
515                                                 printf("../");
516                                         }
517                                 }
518                                 putchar('\n');
519                                 continue;
520                         }
521                         if (!strcmp(arg, "--git-dir")) {
522                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
523                                 static char cwd[PATH_MAX];
524                                 if (gitdir) {
525                                         puts(gitdir);
526                                         continue;
527                                 }
528                                 if (!prefix) {
529                                         puts(".git");
530                                         continue;
531                                 }
532                                 if (!getcwd(cwd, PATH_MAX))
533                                         die("unable to get current working directory");
534                                 printf("%s/.git\n", cwd);
535                                 continue;
536                         }
537                         if (!strcmp(arg, "--is-inside-git-dir")) {
538                                 printf("%s\n", is_inside_git_dir() ? "true"
539                                                 : "false");
540                                 continue;
541                         }
542                         if (!strcmp(arg, "--is-inside-work-tree")) {
543                                 printf("%s\n", is_inside_work_tree() ? "true"
544                                                 : "false");
545                                 continue;
546                         }
547                         if (!strcmp(arg, "--is-bare-repository")) {
548                                 printf("%s\n", is_bare_repository() ? "true"
549                                                 : "false");
550                                 continue;
551                         }
552                         if (!prefixcmp(arg, "--since=")) {
553                                 show_datestring("--max-age=", arg+8);
554                                 continue;
555                         }
556                         if (!prefixcmp(arg, "--after=")) {
557                                 show_datestring("--max-age=", arg+8);
558                                 continue;
559                         }
560                         if (!prefixcmp(arg, "--before=")) {
561                                 show_datestring("--min-age=", arg+9);
562                                 continue;
563                         }
564                         if (!prefixcmp(arg, "--until=")) {
565                                 show_datestring("--min-age=", arg+8);
566                                 continue;
567                         }
568                         if (show_flag(arg) && verify)
569                                 die_no_single_rev(quiet);
570                         continue;
571                 }
572
573                 /* Not a flag argument */
574                 if (try_difference(arg))
575                         continue;
576                 name = arg;
577                 type = NORMAL;
578                 if (*arg == '^') {
579                         name++;
580                         type = REVERSED;
581                 }
582                 if (!get_sha1(name, sha1)) {
583                         if (verify)
584                                 revs_count++;
585                         else
586                                 show_rev(type, sha1, name);
587                         continue;
588                 }
589                 if (verify)
590                         die_no_single_rev(quiet);
591                 as_is = 1;
592                 if (!show_file(arg))
593                         continue;
594                 verify_filename(prefix, arg);
595         }
596         if (verify) {
597                 if (revs_count == 1) {
598                         show_rev(type, sha1, name);
599                         return 0;
600                 } else if (revs_count == 0 && show_default())
601                         return 0;
602                 die_no_single_rev(quiet);
603         } else
604                 show_default();
605         return 0;
606 }