Merge branch 'maint'
[git/git.git] / builtin-rev-parse.c
CommitLineData
178cb243
LT
1/*
2 * rev-parse.c
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
a8be83fe 7#include "commit.h"
960bba0d 8#include "refs.h"
c1babb1d 9#include "quote.h"
895f10c3 10#include "builtin.h"
a8be83fe 11
4866ccf0
JH
12#define DO_REVS 1
13#define DO_NOREV 2
14#define DO_FLAGS 4
15#define DO_NONFLAGS 8
16static int filter = ~0;
17
96f1e58f 18static const char *def;
023d66ed 19
042a4ed7
LT
20#define NORMAL 0
21#define REVERSED 1
22static int show_type = NORMAL;
96f1e58f
DR
23static int symbolic;
24static int abbrev;
25static int output_sq;
4866ccf0 26
96f1e58f 27static int revs_count;
042a4ed7 28
921d865e
LT
29/*
30 * Some arguments are relevant "revision" arguments,
31 * others are about output format or other details.
32 * This sorts it all out.
33 */
34static int is_rev_argument(const char *arg)
35{
36 static const char *rev_args[] = {
e091eb93 37 "--all",
4866ccf0 38 "--bisect",
5a83f3be 39 "--dense",
a62be77f 40 "--branches",
4866ccf0 41 "--header",
921d865e 42 "--max-age=",
4866ccf0 43 "--max-count=",
4866ccf0 44 "--min-age=",
5ccfb758 45 "--no-merges",
4866ccf0 46 "--objects",
c6496575 47 "--objects-edge",
4866ccf0
JH
48 "--parents",
49 "--pretty",
a62be77f 50 "--remotes",
5a83f3be 51 "--sparse",
a62be77f 52 "--tags",
4866ccf0 53 "--topo-order",
4c8725f1 54 "--date-order",
4866ccf0 55 "--unpacked",
921d865e
LT
56 NULL
57 };
58 const char **p = rev_args;
59
8233340c
EW
60 /* accept -<digit>, like traditional "head" */
61 if ((*arg == '-') && isdigit(arg[1]))
62 return 1;
63
921d865e
LT
64 for (;;) {
65 const char *str = *p++;
66 int len;
67 if (!str)
68 return 0;
69 len = strlen(str);
4866ccf0
JH
70 if (!strcmp(arg, str) ||
71 (str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e
LT
72 return 1;
73 }
74}
75
4866ccf0 76/* Output argument as a string, either SQ or normal */
5bb2c65a
JH
77static void show(const char *arg)
78{
79 if (output_sq) {
80 int sq = '\'', ch;
81
82 putchar(sq);
83 while ((ch = *arg++)) {
84 if (ch == sq)
85 fputs("'\\'", stdout);
86 putchar(ch);
87 }
88 putchar(sq);
89 putchar(' ');
90 }
91 else
92 puts(arg);
93}
94
4866ccf0 95/* Output a revision, only if filter allows it */
30b96fce 96static void show_rev(int type, const unsigned char *sha1, const char *name)
023d66ed 97{
4866ccf0 98 if (!(filter & DO_REVS))
023d66ed 99 return;
4866ccf0
JH
100 def = NULL;
101 revs_count++;
5bb2c65a 102
30b96fce
JH
103 if (type != show_type)
104 putchar('^');
105 if (symbolic && name)
106 show(name);
d5012508
JH
107 else if (abbrev)
108 show(find_unique_abbrev(sha1, abbrev));
30b96fce
JH
109 else
110 show(sha1_to_hex(sha1));
023d66ed
LT
111}
112
4866ccf0 113/* Output a flag, only if filter allows it. */
16cee38a 114static int show_flag(const char *arg)
023d66ed 115{
4866ccf0 116 if (!(filter & DO_FLAGS))
9523a4c2
LT
117 return 0;
118 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
0360e99d 119 show(arg);
9523a4c2
LT
120 return 1;
121 }
122 return 0;
023d66ed
LT
123}
124
023d66ed
LT
125static void show_default(void)
126{
16cee38a 127 const char *s = def;
023d66ed
LT
128
129 if (s) {
130 unsigned char sha1[20];
131
132 def = NULL;
9938af6a 133 if (!get_sha1(s, sha1)) {
30b96fce 134 show_rev(NORMAL, sha1, s);
023d66ed
LT
135 return;
136 }
023d66ed
LT
137 }
138}
139
8da19775 140static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
960bba0d 141{
30b96fce 142 show_rev(NORMAL, sha1, refname);
960bba0d
LT
143 return 0;
144}
145
c1babb1d
LT
146static void show_datestring(const char *flag, const char *datestr)
147{
c1babb1d 148 static char buffer[100];
c1babb1d
LT
149
150 /* date handling requires both flags and revs */
151 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
152 return;
3c07b1d1 153 snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d
LT
154 show(buffer);
155}
156
9ad0a933 157static int show_file(const char *arg)
7a3dd472 158{
7b34c2fa 159 show_default();
9ad0a933 160 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
7a3dd472 161 show(arg);
9ad0a933
LT
162 return 1;
163 }
164 return 0;
7a3dd472
LT
165}
166
b7d936b2 167static int try_difference(const char *arg)
3dd4e732
SB
168{
169 char *dotdot;
170 unsigned char sha1[20];
171 unsigned char end[20];
172 const char *next;
173 const char *this;
174 int symmetric;
175
176 if (!(dotdot = strstr(arg, "..")))
177 return 0;
178 next = dotdot + 2;
179 this = arg;
180 symmetric = (*next == '.');
181
182 *dotdot = 0;
183 next += symmetric;
184
185 if (!*next)
186 next = "HEAD";
187 if (dotdot == arg)
188 this = "HEAD";
189 if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
190 show_rev(NORMAL, end, next);
191 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
192 if (symmetric) {
193 struct commit_list *exclude;
194 struct commit *a, *b;
195 a = lookup_commit_reference(sha1);
196 b = lookup_commit_reference(end);
197 exclude = get_merge_bases(a, b, 1);
198 while (exclude) {
199 struct commit_list *n = exclude->next;
200 show_rev(REVERSED,
201 exclude->item->object.sha1,NULL);
202 free(exclude);
203 exclude = n;
204 }
205 }
206 return 1;
207 }
208 *dotdot = '.';
209 return 0;
210}
211
a633fca0 212int cmd_rev_parse(int argc, const char **argv, const char *prefix)
178cb243 213{
4866ccf0 214 int i, as_is = 0, verify = 0;
178cb243 215 unsigned char sha1[20];
a62be77f 216
84a9b58c
JH
217 git_config(git_default_config);
218
178cb243 219 for (i = 1; i < argc; i++) {
16cee38a 220 const char *arg = argv[i];
fb18a2ed 221
178cb243 222 if (as_is) {
fb18a2ed 223 if (show_file(arg) && as_is < 2)
e23d0b4a 224 verify_filename(prefix, arg);
178cb243
LT
225 continue;
226 }
3af06987
EW
227 if (!strcmp(arg,"-n")) {
228 if (++i >= argc)
229 die("-n requires an argument");
230 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
231 show(arg);
232 show(argv[i]);
233 }
234 continue;
235 }
1968d77d 236 if (!prefixcmp(arg, "-n")) {
3af06987
EW
237 if ((filter & DO_FLAGS) && (filter & DO_REVS))
238 show(arg);
239 continue;
240 }
241
178cb243
LT
242 if (*arg == '-') {
243 if (!strcmp(arg, "--")) {
fb18a2ed 244 as_is = 2;
a08b6505
LT
245 /* Pass on the "--" if we show anything but files.. */
246 if (filter & (DO_FLAGS | DO_REVS))
247 show_file(arg);
4866ccf0 248 continue;
178cb243
LT
249 }
250 if (!strcmp(arg, "--default")) {
178cb243
LT
251 def = argv[i+1];
252 i++;
253 continue;
254 }
8ebb0184 255 if (!strcmp(arg, "--revs-only")) {
4866ccf0 256 filter &= ~DO_NOREV;
8ebb0184
LT
257 continue;
258 }
259 if (!strcmp(arg, "--no-revs")) {
4866ccf0 260 filter &= ~DO_REVS;
8ebb0184
LT
261 continue;
262 }
f79b65aa 263 if (!strcmp(arg, "--flags")) {
4866ccf0 264 filter &= ~DO_NONFLAGS;
f79b65aa
LT
265 continue;
266 }
267 if (!strcmp(arg, "--no-flags")) {
4866ccf0 268 filter &= ~DO_FLAGS;
f79b65aa
LT
269 continue;
270 }
023d66ed 271 if (!strcmp(arg, "--verify")) {
4866ccf0
JH
272 filter &= ~(DO_FLAGS|DO_NOREV);
273 verify = 1;
023d66ed 274 continue;
921d865e 275 }
62a604ba 276 if (!strcmp(arg, "--short") ||
cc44c765 277 !prefixcmp(arg, "--short=")) {
d5012508
JH
278 filter &= ~(DO_FLAGS|DO_NOREV);
279 verify = 1;
280 abbrev = DEFAULT_ABBREV;
44de0da4
JF
281 if (arg[7] == '=')
282 abbrev = strtoul(arg + 8, NULL, 10);
1dc4fb84
JH
283 if (abbrev < MINIMUM_ABBREV)
284 abbrev = MINIMUM_ABBREV;
285 else if (40 <= abbrev)
286 abbrev = 40;
d5012508
JH
287 continue;
288 }
5bb2c65a
JH
289 if (!strcmp(arg, "--sq")) {
290 output_sq = 1;
291 continue;
292 }
042a4ed7
LT
293 if (!strcmp(arg, "--not")) {
294 show_type ^= REVERSED;
295 continue;
296 }
30b96fce
JH
297 if (!strcmp(arg, "--symbolic")) {
298 symbolic = 1;
299 continue;
300 }
960bba0d 301 if (!strcmp(arg, "--all")) {
cb5d709f 302 for_each_ref(show_reference, NULL);
960bba0d
LT
303 continue;
304 }
a62be77f 305 if (!strcmp(arg, "--branches")) {
cb5d709f 306 for_each_branch_ref(show_reference, NULL);
a62be77f
SE
307 continue;
308 }
309 if (!strcmp(arg, "--tags")) {
cb5d709f 310 for_each_tag_ref(show_reference, NULL);
a62be77f
SE
311 continue;
312 }
313 if (!strcmp(arg, "--remotes")) {
cb5d709f 314 for_each_remote_ref(show_reference, NULL);
a62be77f
SE
315 continue;
316 }
d288a700 317 if (!strcmp(arg, "--show-prefix")) {
4866ccf0
JH
318 if (prefix)
319 puts(prefix);
d288a700
LT
320 continue;
321 }
5f94c730
JH
322 if (!strcmp(arg, "--show-cdup")) {
323 const char *pfx = prefix;
e90fdc39
JS
324 if (!is_inside_work_tree()) {
325 const char *work_tree =
326 get_git_work_tree();
327 if (work_tree)
328 printf("%s\n", work_tree);
329 continue;
330 }
5f94c730
JH
331 while (pfx) {
332 pfx = strchr(pfx, '/');
333 if (pfx) {
334 pfx++;
335 printf("../");
336 }
337 }
338 putchar('\n');
339 continue;
340 }
a8783eeb
LT
341 if (!strcmp(arg, "--git-dir")) {
342 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
343 static char cwd[PATH_MAX];
344 if (gitdir) {
345 puts(gitdir);
346 continue;
347 }
348 if (!prefix) {
349 puts(".git");
350 continue;
351 }
352 if (!getcwd(cwd, PATH_MAX))
353 die("unable to get current working directory");
354 printf("%s/.git\n", cwd);
355 continue;
356 }
6d9ba67b
JS
357 if (!strcmp(arg, "--is-inside-git-dir")) {
358 printf("%s\n", is_inside_git_dir() ? "true"
359 : "false");
360 continue;
361 }
892c41b9
ML
362 if (!strcmp(arg, "--is-inside-work-tree")) {
363 printf("%s\n", is_inside_work_tree() ? "true"
364 : "false");
365 continue;
366 }
493c774e
ML
367 if (!strcmp(arg, "--is-bare-repository")) {
368 printf("%s\n", is_bare_repository() ? "true"
369 : "false");
370 continue;
371 }
cc44c765 372 if (!prefixcmp(arg, "--since=")) {
c1babb1d
LT
373 show_datestring("--max-age=", arg+8);
374 continue;
375 }
cc44c765 376 if (!prefixcmp(arg, "--after=")) {
c1babb1d
LT
377 show_datestring("--max-age=", arg+8);
378 continue;
379 }
cc44c765 380 if (!prefixcmp(arg, "--before=")) {
c1babb1d
LT
381 show_datestring("--min-age=", arg+9);
382 continue;
383 }
cc44c765 384 if (!prefixcmp(arg, "--until=")) {
c1babb1d
LT
385 show_datestring("--min-age=", arg+8);
386 continue;
387 }
9523a4c2 388 if (show_flag(arg) && verify)
4866ccf0 389 die("Needed a single revision");
178cb243
LT
390 continue;
391 }
4866ccf0
JH
392
393 /* Not a flag argument */
3dd4e732
SB
394 if (try_difference(arg))
395 continue;
9938af6a 396 if (!get_sha1(arg, sha1)) {
30b96fce 397 show_rev(NORMAL, sha1, arg);
800644c5
LT
398 continue;
399 }
9938af6a 400 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce 401 show_rev(REVERSED, sha1, arg+1);
800644c5
LT
402 continue;
403 }
9ad0a933
LT
404 as_is = 1;
405 if (!show_file(arg))
406 continue;
4866ccf0
JH
407 if (verify)
408 die("Needed a single revision");
e23d0b4a 409 verify_filename(prefix, arg);
023d66ed
LT
410 }
411 show_default();
4866ccf0
JH
412 if (verify && revs_count != 1)
413 die("Needed a single revision");
178cb243
LT
414 return 0;
415}