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[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"
10
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;
16
17 static char *def = NULL;
18
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;
25
26 static int revs_count = 0;
27
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                 "--branches",
40                 "--header",
41                 "--max-age=",
42                 "--max-count=",
43                 "--min-age=",
44                 "--no-merges",
45                 "--objects",
46                 "--objects-edge",
47                 "--parents",
48                 "--pretty",
49                 "--remotes",
50                 "--sparse",
51                 "--tags",
52                 "--topo-order",
53                 "--date-order",
54                 "--unpacked",
55                 NULL
56         };
57         const char **p = rev_args;
58
59         /* accept -<digit>, like traditional "head" */
60         if ((*arg == '-') && isdigit(arg[1]))
61                 return 1;
62
63         for (;;) {
64                 const char *str = *p++;
65                 int len;
66                 if (!str)
67                         return 0;
68                 len = strlen(str);
69                 if (!strcmp(arg, str) ||
70                     (str[len-1] == '=' && !strncmp(arg, str, len)))
71                         return 1;
72         }
73 }
74
75 /* Output argument as a string, either SQ or normal */
76 static void show(const char *arg)
77 {
78         if (output_sq) {
79                 int sq = '\'', ch;
80
81                 putchar(sq);
82                 while ((ch = *arg++)) {
83                         if (ch == sq)
84                                 fputs("'\\'", stdout);
85                         putchar(ch);
86                 }
87                 putchar(sq);
88                 putchar(' ');
89         }
90         else
91                 puts(arg);
92 }
93
94 /* Output a revision, only if filter allows it */
95 static void show_rev(int type, const unsigned char *sha1, const char *name)
96 {
97         if (!(filter & DO_REVS))
98                 return;
99         def = NULL;
100         revs_count++;
101
102         if (type != show_type)
103                 putchar('^');
104         if (symbolic && name)
105                 show(name);
106         else if (abbrev)
107                 show(find_unique_abbrev(sha1, abbrev));
108         else
109                 show(sha1_to_hex(sha1));
110 }
111
112 /* Output a flag, only if filter allows it. */
113 static int show_flag(char *arg)
114 {
115         if (!(filter & DO_FLAGS))
116                 return 0;
117         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
118                 show(arg);
119                 return 1;
120         }
121         return 0;
122 }
123
124 static void show_default(void)
125 {
126         char *s = def;
127
128         if (s) {
129                 unsigned char sha1[20];
130
131                 def = NULL;
132                 if (!get_sha1(s, sha1)) {
133                         show_rev(NORMAL, sha1, s);
134                         return;
135                 }
136         }
137 }
138
139 static int show_reference(const char *refname, const unsigned char *sha1)
140 {
141         show_rev(NORMAL, sha1, refname);
142         return 0;
143 }
144
145 static void show_datestring(const char *flag, const char *datestr)
146 {
147         static char buffer[100];
148
149         /* date handling requires both flags and revs */
150         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
151                 return;
152         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
153         show(buffer);
154 }
155
156 static int show_file(const char *arg)
157 {
158         show_default();
159         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
160                 show(arg);
161                 return 1;
162         }
163         return 0;
164 }
165
166 int main(int argc, char **argv)
167 {
168         int i, as_is = 0, verify = 0;
169         unsigned char sha1[20];
170         const char *prefix = setup_git_directory();
171
172         git_config(git_default_config);
173
174         for (i = 1; i < argc; i++) {
175                 char *arg = argv[i];
176                 char *dotdot;
177
178                 if (as_is) {
179                         if (show_file(arg) && as_is < 2)
180                                 verify_filename(prefix, arg);
181                         continue;
182                 }
183                 if (!strcmp(arg,"-n")) {
184                         if (++i >= argc)
185                                 die("-n requires an argument");
186                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
187                                 show(arg);
188                                 show(argv[i]);
189                         }
190                         continue;
191                 }
192                 if (!strncmp(arg,"-n",2)) {
193                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
194                                 show(arg);
195                         continue;
196                 }
197
198                 if (*arg == '-') {
199                         if (!strcmp(arg, "--")) {
200                                 as_is = 2;
201                                 /* Pass on the "--" if we show anything but files.. */
202                                 if (filter & (DO_FLAGS | DO_REVS))
203                                         show_file(arg);
204                                 continue;
205                         }
206                         if (!strcmp(arg, "--default")) {
207                                 def = argv[i+1];
208                                 i++;
209                                 continue;
210                         }
211                         if (!strcmp(arg, "--revs-only")) {
212                                 filter &= ~DO_NOREV;
213                                 continue;
214                         }
215                         if (!strcmp(arg, "--no-revs")) {
216                                 filter &= ~DO_REVS;
217                                 continue;
218                         }
219                         if (!strcmp(arg, "--flags")) {
220                                 filter &= ~DO_NONFLAGS;
221                                 continue;
222                         }
223                         if (!strcmp(arg, "--no-flags")) {
224                                 filter &= ~DO_FLAGS;
225                                 continue;
226                         }
227                         if (!strcmp(arg, "--verify")) {
228                                 filter &= ~(DO_FLAGS|DO_NOREV);
229                                 verify = 1;
230                                 continue;
231                         }
232                         if (!strcmp(arg, "--short") ||
233                             !strncmp(arg, "--short=", 8)) {
234                                 filter &= ~(DO_FLAGS|DO_NOREV);
235                                 verify = 1;
236                                 abbrev = DEFAULT_ABBREV;
237                                 if (arg[7] == '=')
238                                         abbrev = strtoul(arg + 8, NULL, 10);
239                                 if (abbrev < MINIMUM_ABBREV)
240                                         abbrev = MINIMUM_ABBREV;
241                                 else if (40 <= abbrev)
242                                         abbrev = 40;
243                                 continue;
244                         }
245                         if (!strcmp(arg, "--sq")) {
246                                 output_sq = 1;
247                                 continue;
248                         }
249                         if (!strcmp(arg, "--not")) {
250                                 show_type ^= REVERSED;
251                                 continue;
252                         }
253                         if (!strcmp(arg, "--symbolic")) {
254                                 symbolic = 1;
255                                 continue;
256                         }
257                         if (!strcmp(arg, "--all")) {
258                                 for_each_ref(show_reference);
259                                 continue;
260                         }
261                         if (!strcmp(arg, "--branches")) {
262                                 for_each_branch_ref(show_reference);
263                                 continue;
264                         }
265                         if (!strcmp(arg, "--tags")) {
266                                 for_each_tag_ref(show_reference);
267                                 continue;
268                         }
269                         if (!strcmp(arg, "--remotes")) {
270                                 for_each_remote_ref(show_reference);
271                                 continue;
272                         }
273                         if (!strcmp(arg, "--show-prefix")) {
274                                 if (prefix)
275                                         puts(prefix);
276                                 continue;
277                         }
278                         if (!strcmp(arg, "--show-cdup")) {
279                                 const char *pfx = prefix;
280                                 while (pfx) {
281                                         pfx = strchr(pfx, '/');
282                                         if (pfx) {
283                                                 pfx++;
284                                                 printf("../");
285                                         }
286                                 }
287                                 putchar('\n');
288                                 continue;
289                         }
290                         if (!strcmp(arg, "--git-dir")) {
291                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
292                                 static char cwd[PATH_MAX];
293                                 if (gitdir) {
294                                         puts(gitdir);
295                                         continue;
296                                 }
297                                 if (!prefix) {
298                                         puts(".git");
299                                         continue;
300                                 }
301                                 if (!getcwd(cwd, PATH_MAX))
302                                         die("unable to get current working directory");
303                                 printf("%s/.git\n", cwd);
304                                 continue;
305                         }
306                         if (!strncmp(arg, "--since=", 8)) {
307                                 show_datestring("--max-age=", arg+8);
308                                 continue;
309                         }
310                         if (!strncmp(arg, "--after=", 8)) {
311                                 show_datestring("--max-age=", arg+8);
312                                 continue;
313                         }
314                         if (!strncmp(arg, "--before=", 9)) {
315                                 show_datestring("--min-age=", arg+9);
316                                 continue;
317                         }
318                         if (!strncmp(arg, "--until=", 8)) {
319                                 show_datestring("--min-age=", arg+8);
320                                 continue;
321                         }
322                         if (show_flag(arg) && verify)
323                                 die("Needed a single revision");
324                         continue;
325                 }
326
327                 /* Not a flag argument */
328                 dotdot = strstr(arg, "..");
329                 if (dotdot) {
330                         unsigned char end[20];
331                         char *next = dotdot + 2;
332                         char *this = arg;
333                         *dotdot = 0;
334                         if (!*next)
335                                 next = "HEAD";
336                         if (dotdot == arg)
337                                 this = "HEAD";
338                         if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
339                                 show_rev(NORMAL, end, next);
340                                 show_rev(REVERSED, sha1, this);
341                                 continue;
342                         }
343                         *dotdot = '.';
344                 }
345                 if (!get_sha1(arg, sha1)) {
346                         show_rev(NORMAL, sha1, arg);
347                         continue;
348                 }
349                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
350                         show_rev(REVERSED, sha1, arg+1);
351                         continue;
352                 }
353                 as_is = 1;
354                 if (!show_file(arg))
355                         continue;
356                 if (verify)
357                         die("Needed a single revision");
358                 verify_filename(prefix, arg);
359         }
360         show_default();
361         if (verify && revs_count != 1)
362                 die("Needed a single revision");
363         return 0;
364 }