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