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