rev-list: allow -n<n> as shorthand for --max-count=<n>
[git/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 "--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 }