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#define DO_REVS 1
12#define DO_NOREV 2
13#define DO_FLAGS 4
14#define DO_NONFLAGS 8
15static int filter = ~0;
16static char *def = NULL;
18#define NORMAL 0
20#define REVERSED 1
21static int show_type = NORMAL;
22static int symbolic = 0;
23static int abbrev = 0;
24static int output_sq = 0;
25static int revs_count = 0;
27/*
29 * Some arguments are relevant "revision" arguments,
30 * others are about output format or other details.
31 * This sorts it all out.
32 */
33static 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 /* accept -<digit>, like traditional "head" */
60 if ((*arg == '-') && isdigit(arg[1]))
61 return 1;
62 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/* Output argument as a string, either SQ or normal */
76static void show(const char *arg)
77{
78 if (output_sq) {
79 int sq = '\'', ch;
80 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/* Output a revision, only if filter allows it */
95static 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 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/* Output a flag, only if filter allows it. */
113static 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}
123static void show_default(void)
125{
126 char *s = def;
127 if (s) {
129 unsigned char sha1[20];
130 def = NULL;
132 if (!get_sha1(s, sha1)) {
133 show_rev(NORMAL, sha1, s);
134 return;
135 }
136 }
137}
138static int show_reference(const char *refname, const unsigned char *sha1)
140{
141 show_rev(NORMAL, sha1, refname);
142 return 0;
143}
144static void show_datestring(const char *flag, const char *datestr)
146{
147 static char buffer[100];
148 /* 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}
155static 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}
165int 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 git_config(git_default_config);
173 for (i = 1; i < argc; i++) {
175 char *arg = argv[i];
176 char *dotdot;
177 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 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 /* 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}