rev-list: allow -n<n> as shorthand for --max-count=<n>
[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                 "--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;
55
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 }
67
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;
73
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 }
86
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++;
94
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));
103 }
104
105 /* Output a flag, only if filter allows it. */
106 static void show_flag(char *arg)
107 {
108         if (!(filter & DO_FLAGS))
109                 return;
110         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
111                 show(arg);
112 }
113
114 static void show_default(void)
115 {
116         char *s = def;
117
118         if (s) {
119                 unsigned char sha1[20];
120
121                 def = NULL;
122                 if (!get_sha1(s, sha1)) {
123                         show_rev(NORMAL, sha1, s);
124                         return;
125                 }
126         }
127 }
128
129 static int show_reference(const char *refname, const unsigned char *sha1)
130 {
131         show_rev(NORMAL, sha1, refname);
132         return 0;
133 }
134
135 static void show_datestring(const char *flag, const char *datestr)
136 {
137         static char buffer[100];
138
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);
144 }
145
146 static void show_file(const char *arg)
147 {
148         show_default();
149         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
150                 show(arg);
151 }
152
153 int main(int argc, char **argv)
154 {
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 (!strcmp(arg,"-n")) {
169                         if (++i >= argc)
170                                 die("-n requires an argument");
171                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
172                                 show(arg);
173                                 show(argv[i]);
174                         }
175                         continue;
176                 }
177                 if (!strncmp(arg,"-n",2)) {
178                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
179                                 show(arg);
180                         continue;
181                 }
182
183                 if (*arg == '-') {
184                         if (!strcmp(arg, "--")) {
185                                 as_is = 1;
186                                 /* Pass on the "--" if we show anything but files.. */
187                                 if (filter & (DO_FLAGS | DO_REVS))
188                                         show_file(arg);
189                                 continue;
190                         }
191                         if (!strcmp(arg, "--default")) {
192                                 def = argv[i+1];
193                                 i++;
194                                 continue;
195                         }
196                         if (!strcmp(arg, "--revs-only")) {
197                                 filter &= ~DO_NOREV;
198                                 continue;
199                         }
200                         if (!strcmp(arg, "--no-revs")) {
201                                 filter &= ~DO_REVS;
202                                 continue;
203                         }
204                         if (!strcmp(arg, "--flags")) {
205                                 filter &= ~DO_NONFLAGS;
206                                 continue;
207                         }
208                         if (!strcmp(arg, "--no-flags")) {
209                                 filter &= ~DO_FLAGS;
210                                 continue;
211                         }
212                         if (!strcmp(arg, "--verify")) {
213                                 filter &= ~(DO_FLAGS|DO_NOREV);
214                                 verify = 1;
215                                 continue;
216                         }
217                         if (!strcmp(arg, "--short") ||
218                             !strncmp(arg, "--short=", 9)) {
219                                 filter &= ~(DO_FLAGS|DO_NOREV);
220                                 verify = 1;
221                                 abbrev = DEFAULT_ABBREV;
222                                 if (arg[8] == '=')
223                                         abbrev = strtoul(arg + 9, NULL, 10);
224                                 if (abbrev < MINIMUM_ABBREV)
225                                         abbrev = MINIMUM_ABBREV;
226                                 else if (40 <= abbrev)
227                                         abbrev = 40;
228                                 continue;
229                         }
230                         if (!strcmp(arg, "--sq")) {
231                                 output_sq = 1;
232                                 continue;
233                         }
234                         if (!strcmp(arg, "--not")) {
235                                 show_type ^= REVERSED;
236                                 continue;
237                         }
238                         if (!strcmp(arg, "--symbolic")) {
239                                 symbolic = 1;
240                                 continue;
241                         }
242                         if (!strcmp(arg, "--all")) {
243                                 for_each_ref(show_reference);
244                                 continue;
245                         }
246                         if (!strcmp(arg, "--show-prefix")) {
247                                 if (prefix)
248                                         puts(prefix);
249                                 continue;
250                         }
251                         if (!strcmp(arg, "--show-cdup")) {
252                                 const char *pfx = prefix;
253                                 while (pfx) {
254                                         pfx = strchr(pfx, '/');
255                                         if (pfx) {
256                                                 pfx++;
257                                                 printf("../");
258                                         }
259                                 }
260                                 putchar('\n');
261                                 continue;
262                         }
263                         if (!strcmp(arg, "--git-dir")) {
264                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
265                                 static char cwd[PATH_MAX];
266                                 if (gitdir) {
267                                         puts(gitdir);
268                                         continue;
269                                 }
270                                 if (!prefix) {
271                                         puts(".git");
272                                         continue;
273                                 }
274                                 if (!getcwd(cwd, PATH_MAX))
275                                         die("unable to get current working directory");
276                                 printf("%s/.git\n", cwd);
277                                 continue;
278                         }
279                         if (!strncmp(arg, "--since=", 8)) {
280                                 show_datestring("--max-age=", arg+8);
281                                 continue;
282                         }
283                         if (!strncmp(arg, "--after=", 8)) {
284                                 show_datestring("--max-age=", arg+8);
285                                 continue;
286                         }
287                         if (!strncmp(arg, "--before=", 9)) {
288                                 show_datestring("--min-age=", arg+9);
289                                 continue;
290                         }
291                         if (!strncmp(arg, "--until=", 8)) {
292                                 show_datestring("--min-age=", arg+8);
293                                 continue;
294                         }
295                         if (verify)
296                                 die("Needed a single revision");
297                         show_flag(arg);
298                         continue;
299                 }
300
301                 /* Not a flag argument */
302                 dotdot = strstr(arg, "..");
303                 if (dotdot) {
304                         unsigned char end[20];
305                         char *n = dotdot+2;
306                         *dotdot = 0;
307                         if (!get_sha1(arg, sha1)) {
308                                 if (!*n)
309                                         n = "HEAD";
310                                 if (!get_sha1(n, end)) {
311                                         show_rev(NORMAL, end, n);
312                                         show_rev(REVERSED, sha1, arg);
313                                         continue;
314                                 }
315                         }
316                         *dotdot = '.';
317                 }
318                 if (!get_sha1(arg, sha1)) {
319                         show_rev(NORMAL, sha1, arg);
320                         continue;
321                 }
322                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
323                         show_rev(REVERSED, sha1, arg+1);
324                         continue;
325                 }
326                 if (verify)
327                         die("Needed a single revision");
328                 if ((filter & DO_REVS) &&
329                     (filter & DO_NONFLAGS) && /* !def && */
330                     lstat(arg, &st) < 0)
331                         die("'%s': %s", arg, strerror(errno));
332                 as_is = 1;
333                 show_file(arg);
334         }
335         show_default();
336         if (verify && revs_count != 1)
337                 die("Needed a single revision");
338         return 0;
339 }