Code

rev-parse --abbrev: do not try abbrev shorter than minimum.
[git.git] / 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"
11 #define DO_REVS         1
12 #define DO_NOREV        2
13 #define DO_FLAGS        4
14 #define DO_NONFLAGS     8
15 static int filter = ~0;
17 static char *def = NULL;
19 #define NORMAL 0
20 #define REVERSED 1
21 static int show_type = NORMAL;
22 static int symbolic = 0;
23 static int abbrev = 0;
24 static int output_sq = 0;
26 static int revs_count = 0;
28 /*
29  * Some arguments are relevant "revision" arguments,
30  * others are about output format or other details.
31  * This sorts it all out.
32  */
33 static int is_rev_argument(const char *arg)
34 {
35         static const char *rev_args[] = {
36                 "--all",
37                 "--bisect",
38                 "--dense",
39                 "--header",
40                 "--max-age=",
41                 "--max-count=",
42                 "--merge-order",
43                 "--min-age=",
44                 "--no-merges",
45                 "--objects",
46                 "--parents",
47                 "--pretty",
48                 "--show-breaks",
49                 "--sparse",
50                 "--topo-order",
51                 "--unpacked",
52                 NULL
53         };
54         const char **p = rev_args;
56         for (;;) {
57                 const char *str = *p++;
58                 int len;
59                 if (!str)
60                         return 0;
61                 len = strlen(str);
62                 if (!strcmp(arg, str) ||
63                     (str[len-1] == '=' && !strncmp(arg, str, len)))
64                         return 1;
65         }
66 }
68 /* Output argument as a string, either SQ or normal */
69 static void show(const char *arg)
70 {
71         if (output_sq) {
72                 int sq = '\'', ch;
74                 putchar(sq);
75                 while ((ch = *arg++)) {
76                         if (ch == sq)
77                                 fputs("'\\'", stdout);
78                         putchar(ch);
79                 }
80                 putchar(sq);
81                 putchar(' ');
82         }
83         else
84                 puts(arg);
85 }
87 /* Output a revision, only if filter allows it */
88 static void show_rev(int type, const unsigned char *sha1, const char *name)
89 {
90         if (!(filter & DO_REVS))
91                 return;
92         def = NULL;
93         revs_count++;
95         if (type != show_type)
96                 putchar('^');
97         if (symbolic && name)
98                 show(name);
99         else if (abbrev)
100                 show(find_unique_abbrev(sha1, abbrev));
101         else
102                 show(sha1_to_hex(sha1));
105 /* Output a flag, only if filter allows it. */
106 static void show_flag(char *arg)
108         if (!(filter & DO_FLAGS))
109                 return;
110         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
111                 show(arg);
114 static void show_default(void)
116         char *s = def;
118         if (s) {
119                 unsigned char sha1[20];
121                 def = NULL;
122                 if (!get_sha1(s, sha1)) {
123                         show_rev(NORMAL, sha1, s);
124                         return;
125                 }
126         }
129 static int show_reference(const char *refname, const unsigned char *sha1)
131         show_rev(NORMAL, sha1, refname);
132         return 0;
135 static void show_datestring(const char *flag, const char *datestr)
137         static char buffer[100];
139         /* date handling requires both flags and revs */
140         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
141                 return;
142         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
143         show(buffer);
146 static void show_file(const char *arg)
148         show_default();
149         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
150                 show(arg);
153 int main(int argc, char **argv)
155         int i, as_is = 0, verify = 0;
156         unsigned char sha1[20];
157         const char *prefix = setup_git_directory();
158         
159         for (i = 1; i < argc; i++) {
160                 struct stat st;
161                 char *arg = argv[i];
162                 char *dotdot;
163         
164                 if (as_is) {
165                         show_file(arg);
166                         continue;
167                 }
168                 if (*arg == '-') {
169                         if (!strcmp(arg, "--")) {
170                                 as_is = 1;
171                                 /* Pass on the "--" if we show anything but files.. */
172                                 if (filter & (DO_FLAGS | DO_REVS))
173                                         show_file(arg);
174                                 continue;
175                         }
176                         if (!strcmp(arg, "--default")) {
177                                 def = argv[i+1];
178                                 i++;
179                                 continue;
180                         }
181                         if (!strcmp(arg, "--revs-only")) {
182                                 filter &= ~DO_NOREV;
183                                 continue;
184                         }
185                         if (!strcmp(arg, "--no-revs")) {
186                                 filter &= ~DO_REVS;
187                                 continue;
188                         }
189                         if (!strcmp(arg, "--flags")) {
190                                 filter &= ~DO_NONFLAGS;
191                                 continue;
192                         }
193                         if (!strcmp(arg, "--no-flags")) {
194                                 filter &= ~DO_FLAGS;
195                                 continue;
196                         }
197                         if (!strcmp(arg, "--verify")) {
198                                 filter &= ~(DO_FLAGS|DO_NOREV);
199                                 verify = 1;
200                                 continue;
201                         }
202                         if (!strcmp(arg, "--abbrev") ||
203                             !strncmp(arg, "--abbrev=", 9)) {
204                                 filter &= ~(DO_FLAGS|DO_NOREV);
205                                 verify = 1;
206                                 abbrev = DEFAULT_ABBREV;
207                                 if (arg[8] == '=')
208                                         abbrev = strtoul(arg + 9, NULL, 10);
209                                 if (abbrev < MINIMUM_ABBREV)
210                                         abbrev = MINIMUM_ABBREV;
211                                 else if (40 <= abbrev)
212                                         abbrev = 40;
213                                 continue;
214                         }
215                         if (!strcmp(arg, "--sq")) {
216                                 output_sq = 1;
217                                 continue;
218                         }
219                         if (!strcmp(arg, "--not")) {
220                                 show_type ^= REVERSED;
221                                 continue;
222                         }
223                         if (!strcmp(arg, "--symbolic")) {
224                                 symbolic = 1;
225                                 continue;
226                         }
227                         if (!strcmp(arg, "--all")) {
228                                 for_each_ref(show_reference);
229                                 continue;
230                         }
231                         if (!strcmp(arg, "--show-prefix")) {
232                                 if (prefix)
233                                         puts(prefix);
234                                 continue;
235                         }
236                         if (!strcmp(arg, "--show-cdup")) {
237                                 const char *pfx = prefix;
238                                 while (pfx) {
239                                         pfx = strchr(pfx, '/');
240                                         if (pfx) {
241                                                 pfx++;
242                                                 printf("../");
243                                         }
244                                 }
245                                 putchar('\n');
246                                 continue;
247                         }
248                         if (!strcmp(arg, "--git-dir")) {
249                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
250                                 static char cwd[PATH_MAX];
251                                 if (gitdir) {
252                                         puts(gitdir);
253                                         continue;
254                                 }
255                                 if (!prefix) {
256                                         puts(".git");
257                                         continue;
258                                 }
259                                 if (!getcwd(cwd, PATH_MAX))
260                                         die("unable to get current working directory");
261                                 printf("%s/.git\n", cwd);
262                                 continue;
263                         }
264                         if (!strncmp(arg, "--since=", 8)) {
265                                 show_datestring("--max-age=", arg+8);
266                                 continue;
267                         }
268                         if (!strncmp(arg, "--after=", 8)) {
269                                 show_datestring("--max-age=", arg+8);
270                                 continue;
271                         }
272                         if (!strncmp(arg, "--before=", 9)) {
273                                 show_datestring("--min-age=", arg+9);
274                                 continue;
275                         }
276                         if (!strncmp(arg, "--until=", 8)) {
277                                 show_datestring("--min-age=", arg+8);
278                                 continue;
279                         }
280                         if (verify)
281                                 die("Needed a single revision");
282                         show_flag(arg);
283                         continue;
284                 }
286                 /* Not a flag argument */
287                 dotdot = strstr(arg, "..");
288                 if (dotdot) {
289                         unsigned char end[20];
290                         char *n = dotdot+2;
291                         *dotdot = 0;
292                         if (!get_sha1(arg, sha1)) {
293                                 if (!*n)
294                                         n = "HEAD";
295                                 if (!get_sha1(n, end)) {
296                                         show_rev(NORMAL, end, n);
297                                         show_rev(REVERSED, sha1, arg);
298                                         continue;
299                                 }
300                         }
301                         *dotdot = '.';
302                 }
303                 if (!get_sha1(arg, sha1)) {
304                         show_rev(NORMAL, sha1, arg);
305                         continue;
306                 }
307                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
308                         show_rev(REVERSED, sha1, arg+1);
309                         continue;
310                 }
311                 if (verify)
312                         die("Needed a single revision");
313                 if (lstat(arg, &st) < 0)
314                         die("'%s': %s", arg, strerror(errno));
315                 as_is = 1;
316                 show_file(arg);
317         }
318         show_default();
319         if (verify && revs_count != 1)
320                 die("Needed a single revision");
321         return 0;