rev-parse --symbolic-full-name: don't print '^' if SHA1 is not a ref
[git/git.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 /* Like show(), but with a negation prefix according to type */
100 static void show_with_type(int type, const char *arg)
101 {
102 if (type != show_type)
103 putchar('^');
104 show(arg);
105 }
106
107 /* Output a revision, only if filter allows it */
108 static void show_rev(int type, const unsigned char *sha1, const char *name)
109 {
110 if (!(filter & DO_REVS))
111 return;
112 def = NULL;
113 revs_count++;
114
115 if (symbolic && name) {
116 if (symbolic == SHOW_SYMBOLIC_FULL) {
117 unsigned char discard[20];
118 char *full;
119
120 switch (dwim_ref(name, strlen(name), discard, &full)) {
121 case 0:
122 /*
123 * Not found -- not a ref. We could
124 * emit "name" here, but symbolic-full
125 * users are interested in finding the
126 * refs spelled in full, and they would
127 * need to filter non-refs if we did so.
128 */
129 break;
130 case 1: /* happy */
131 show_with_type(type, full);
132 break;
133 default: /* ambiguous */
134 error("refname '%s' is ambiguous", name);
135 break;
136 }
137 } else {
138 show_with_type(type, name);
139 }
140 }
141 else if (abbrev)
142 show_with_type(type, find_unique_abbrev(sha1, abbrev));
143 else
144 show_with_type(type, sha1_to_hex(sha1));
145 }
146
147 /* Output a flag, only if filter allows it. */
148 static int show_flag(const char *arg)
149 {
150 if (!(filter & DO_FLAGS))
151 return 0;
152 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
153 show(arg);
154 return 1;
155 }
156 return 0;
157 }
158
159 static void show_default(void)
160 {
161 const char *s = def;
162
163 if (s) {
164 unsigned char sha1[20];
165
166 def = NULL;
167 if (!get_sha1(s, sha1)) {
168 show_rev(NORMAL, sha1, s);
169 return;
170 }
171 }
172 }
173
174 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
175 {
176 show_rev(NORMAL, sha1, refname);
177 return 0;
178 }
179
180 static void show_datestring(const char *flag, const char *datestr)
181 {
182 static char buffer[100];
183
184 /* date handling requires both flags and revs */
185 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
186 return;
187 snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
188 show(buffer);
189 }
190
191 static int show_file(const char *arg)
192 {
193 show_default();
194 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
195 show(arg);
196 return 1;
197 }
198 return 0;
199 }
200
201 static int try_difference(const char *arg)
202 {
203 char *dotdot;
204 unsigned char sha1[20];
205 unsigned char end[20];
206 const char *next;
207 const char *this;
208 int symmetric;
209
210 if (!(dotdot = strstr(arg, "..")))
211 return 0;
212 next = dotdot + 2;
213 this = arg;
214 symmetric = (*next == '.');
215
216 *dotdot = 0;
217 next += symmetric;
218
219 if (!*next)
220 next = "HEAD";
221 if (dotdot == arg)
222 this = "HEAD";
223 if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
224 show_rev(NORMAL, end, next);
225 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
226 if (symmetric) {
227 struct commit_list *exclude;
228 struct commit *a, *b;
229 a = lookup_commit_reference(sha1);
230 b = lookup_commit_reference(end);
231 exclude = get_merge_bases(a, b, 1);
232 while (exclude) {
233 struct commit_list *n = exclude->next;
234 show_rev(REVERSED,
235 exclude->item->object.sha1,NULL);
236 free(exclude);
237 exclude = n;
238 }
239 }
240 return 1;
241 }
242 *dotdot = '.';
243 return 0;
244 }
245
246 static int parseopt_dump(const struct option *o, const char *arg, int unset)
247 {
248 struct strbuf *parsed = o->value;
249 if (unset)
250 strbuf_addf(parsed, " --no-%s", o->long_name);
251 else if (o->short_name)
252 strbuf_addf(parsed, " -%c", o->short_name);
253 else
254 strbuf_addf(parsed, " --%s", o->long_name);
255 if (arg) {
256 strbuf_addch(parsed, ' ');
257 sq_quote_buf(parsed, arg);
258 }
259 return 0;
260 }
261
262 static const char *skipspaces(const char *s)
263 {
264 while (isspace(*s))
265 s++;
266 return s;
267 }
268
269 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
270 {
271 static int keep_dashdash = 0;
272 static char const * const parseopt_usage[] = {
273 "git-rev-parse --parseopt [options] -- [<args>...]",
274 NULL
275 };
276 static struct option parseopt_opts[] = {
277 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
278 "keep the `--` passed as an arg"),
279 OPT_END(),
280 };
281
282 struct strbuf sb, parsed;
283 const char **usage = NULL;
284 struct option *opts = NULL;
285 int onb = 0, osz = 0, unb = 0, usz = 0;
286
287 strbuf_init(&parsed, 0);
288 strbuf_addstr(&parsed, "set --");
289 argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
290 PARSE_OPT_KEEP_DASHDASH);
291 if (argc < 1 || strcmp(argv[0], "--"))
292 usage_with_options(parseopt_usage, parseopt_opts);
293
294 strbuf_init(&sb, 0);
295 /* get the usage up to the first line with a -- on it */
296 for (;;) {
297 if (strbuf_getline(&sb, stdin, '\n') == EOF)
298 die("premature end of input");
299 ALLOC_GROW(usage, unb + 1, usz);
300 if (!strcmp("--", sb.buf)) {
301 if (unb < 1)
302 die("no usage string given before the `--' separator");
303 usage[unb] = NULL;
304 break;
305 }
306 usage[unb++] = strbuf_detach(&sb, NULL);
307 }
308
309 /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
310 while (strbuf_getline(&sb, stdin, '\n') != EOF) {
311 const char *s;
312 struct option *o;
313
314 if (!sb.len)
315 continue;
316
317 ALLOC_GROW(opts, onb + 1, osz);
318 memset(opts + onb, 0, sizeof(opts[onb]));
319
320 o = &opts[onb++];
321 s = strchr(sb.buf, ' ');
322 if (!s || *sb.buf == ' ') {
323 o->type = OPTION_GROUP;
324 o->help = xstrdup(skipspaces(sb.buf));
325 continue;
326 }
327
328 o->type = OPTION_CALLBACK;
329 o->help = xstrdup(skipspaces(s));
330 o->value = &parsed;
331 o->callback = &parseopt_dump;
332 switch (s[-1]) {
333 case '=':
334 s--;
335 break;
336 case '?':
337 o->flags = PARSE_OPT_OPTARG;
338 s--;
339 break;
340 default:
341 o->flags = PARSE_OPT_NOARG;
342 break;
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 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
369 {
370 int i, as_is = 0, verify = 0;
371 unsigned char sha1[20];
372
373 if (argc > 1 && !strcmp("--parseopt", argv[1]))
374 return cmd_parseopt(argc - 1, argv + 1, prefix);
375
376 prefix = setup_git_directory();
377 git_config(git_default_config);
378 for (i = 1; i < argc; i++) {
379 const char *arg = argv[i];
380
381 if (as_is) {
382 if (show_file(arg) && as_is < 2)
383 verify_filename(prefix, arg);
384 continue;
385 }
386 if (!strcmp(arg,"-n")) {
387 if (++i >= argc)
388 die("-n requires an argument");
389 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
390 show(arg);
391 show(argv[i]);
392 }
393 continue;
394 }
395 if (!prefixcmp(arg, "-n")) {
396 if ((filter & DO_FLAGS) && (filter & DO_REVS))
397 show(arg);
398 continue;
399 }
400
401 if (*arg == '-') {
402 if (!strcmp(arg, "--")) {
403 as_is = 2;
404 /* Pass on the "--" if we show anything but files.. */
405 if (filter & (DO_FLAGS | DO_REVS))
406 show_file(arg);
407 continue;
408 }
409 if (!strcmp(arg, "--default")) {
410 def = argv[i+1];
411 i++;
412 continue;
413 }
414 if (!strcmp(arg, "--revs-only")) {
415 filter &= ~DO_NOREV;
416 continue;
417 }
418 if (!strcmp(arg, "--no-revs")) {
419 filter &= ~DO_REVS;
420 continue;
421 }
422 if (!strcmp(arg, "--flags")) {
423 filter &= ~DO_NONFLAGS;
424 continue;
425 }
426 if (!strcmp(arg, "--no-flags")) {
427 filter &= ~DO_FLAGS;
428 continue;
429 }
430 if (!strcmp(arg, "--verify")) {
431 filter &= ~(DO_FLAGS|DO_NOREV);
432 verify = 1;
433 continue;
434 }
435 if (!strcmp(arg, "--short") ||
436 !prefixcmp(arg, "--short=")) {
437 filter &= ~(DO_FLAGS|DO_NOREV);
438 verify = 1;
439 abbrev = DEFAULT_ABBREV;
440 if (arg[7] == '=')
441 abbrev = strtoul(arg + 8, NULL, 10);
442 if (abbrev < MINIMUM_ABBREV)
443 abbrev = MINIMUM_ABBREV;
444 else if (40 <= abbrev)
445 abbrev = 40;
446 continue;
447 }
448 if (!strcmp(arg, "--sq")) {
449 output_sq = 1;
450 continue;
451 }
452 if (!strcmp(arg, "--not")) {
453 show_type ^= REVERSED;
454 continue;
455 }
456 if (!strcmp(arg, "--symbolic")) {
457 symbolic = SHOW_SYMBOLIC_ASIS;
458 continue;
459 }
460 if (!strcmp(arg, "--symbolic-full-name")) {
461 symbolic = SHOW_SYMBOLIC_FULL;
462 continue;
463 }
464 if (!strcmp(arg, "--all")) {
465 for_each_ref(show_reference, NULL);
466 continue;
467 }
468 if (!strcmp(arg, "--branches")) {
469 for_each_branch_ref(show_reference, NULL);
470 continue;
471 }
472 if (!strcmp(arg, "--tags")) {
473 for_each_tag_ref(show_reference, NULL);
474 continue;
475 }
476 if (!strcmp(arg, "--remotes")) {
477 for_each_remote_ref(show_reference, NULL);
478 continue;
479 }
480 if (!strcmp(arg, "--show-prefix")) {
481 if (prefix)
482 puts(prefix);
483 continue;
484 }
485 if (!strcmp(arg, "--show-cdup")) {
486 const char *pfx = prefix;
487 if (!is_inside_work_tree()) {
488 const char *work_tree =
489 get_git_work_tree();
490 if (work_tree)
491 printf("%s\n", work_tree);
492 continue;
493 }
494 while (pfx) {
495 pfx = strchr(pfx, '/');
496 if (pfx) {
497 pfx++;
498 printf("../");
499 }
500 }
501 putchar('\n');
502 continue;
503 }
504 if (!strcmp(arg, "--git-dir")) {
505 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
506 static char cwd[PATH_MAX];
507 if (gitdir) {
508 puts(gitdir);
509 continue;
510 }
511 if (!prefix) {
512 puts(".git");
513 continue;
514 }
515 if (!getcwd(cwd, PATH_MAX))
516 die("unable to get current working directory");
517 printf("%s/.git\n", cwd);
518 continue;
519 }
520 if (!strcmp(arg, "--is-inside-git-dir")) {
521 printf("%s\n", is_inside_git_dir() ? "true"
522 : "false");
523 continue;
524 }
525 if (!strcmp(arg, "--is-inside-work-tree")) {
526 printf("%s\n", is_inside_work_tree() ? "true"
527 : "false");
528 continue;
529 }
530 if (!strcmp(arg, "--is-bare-repository")) {
531 printf("%s\n", is_bare_repository() ? "true"
532 : "false");
533 continue;
534 }
535 if (!prefixcmp(arg, "--since=")) {
536 show_datestring("--max-age=", arg+8);
537 continue;
538 }
539 if (!prefixcmp(arg, "--after=")) {
540 show_datestring("--max-age=", arg+8);
541 continue;
542 }
543 if (!prefixcmp(arg, "--before=")) {
544 show_datestring("--min-age=", arg+9);
545 continue;
546 }
547 if (!prefixcmp(arg, "--until=")) {
548 show_datestring("--min-age=", arg+8);
549 continue;
550 }
551 if (show_flag(arg) && verify)
552 die("Needed a single revision");
553 continue;
554 }
555
556 /* Not a flag argument */
557 if (try_difference(arg))
558 continue;
559 if (!get_sha1(arg, sha1)) {
560 show_rev(NORMAL, sha1, arg);
561 continue;
562 }
563 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
564 show_rev(REVERSED, sha1, arg+1);
565 continue;
566 }
567 as_is = 1;
568 if (!show_file(arg))
569 continue;
570 if (verify)
571 die("Needed a single revision");
572 verify_filename(prefix, arg);
573 }
574 show_default();
575 if (verify && revs_count != 1)
576 die("Needed a single revision");
577 return 0;
578 }