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 "--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 /* 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}
162int main(int argc, char **argv)
164{
165 int i, as_is = 0, verify = 0;
166 unsigned char sha1[20];
167 const char *prefix = setup_git_directory();
168
169 for (i = 1; i < argc; i++) {
170 struct stat st;
171 char *arg = argv[i];
172 char *dotdot;
173
174 if (as_is) {
175 show_file(arg);
176 continue;
177 }
178 if (!strcmp(arg,"-n")) {
179 if (++i >= argc)
180 die("-n requires an argument");
181 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
182 show(arg);
183 show(argv[i]);
184 }
185 continue;
186 }
187 if (!strncmp(arg,"-n",2)) {
188 if ((filter & DO_FLAGS) && (filter & DO_REVS))
189 show(arg);
190 continue;
191 }
192 if (*arg == '-') {
194 if (!strcmp(arg, "--")) {
195 as_is = 1;
196 /* Pass on the "--" if we show anything but files.. */
197 if (filter & (DO_FLAGS | DO_REVS))
198 show_file(arg);
199 continue;
200 }
201 if (!strcmp(arg, "--default")) {
202 def = argv[i+1];
203 i++;
204 continue;
205 }
206 if (!strcmp(arg, "--revs-only")) {
207 filter &= ~DO_NOREV;
208 continue;
209 }
210 if (!strcmp(arg, "--no-revs")) {
211 filter &= ~DO_REVS;
212 continue;
213 }
214 if (!strcmp(arg, "--flags")) {
215 filter &= ~DO_NONFLAGS;
216 continue;
217 }
218 if (!strcmp(arg, "--no-flags")) {
219 filter &= ~DO_FLAGS;
220 continue;
221 }
222 if (!strcmp(arg, "--verify")) {
223 filter &= ~(DO_FLAGS|DO_NOREV);
224 verify = 1;
225 continue;
226 }
227 if (!strcmp(arg, "--short") ||
228 !strncmp(arg, "--short=", 8)) {
229 filter &= ~(DO_FLAGS|DO_NOREV);
230 verify = 1;
231 abbrev = DEFAULT_ABBREV;
232 if (arg[7] == '=')
233 abbrev = strtoul(arg + 8, NULL, 10);
234 if (abbrev < MINIMUM_ABBREV)
235 abbrev = MINIMUM_ABBREV;
236 else if (40 <= abbrev)
237 abbrev = 40;
238 continue;
239 }
240 if (!strcmp(arg, "--sq")) {
241 output_sq = 1;
242 continue;
243 }
244 if (!strcmp(arg, "--not")) {
245 show_type ^= REVERSED;
246 continue;
247 }
248 if (!strcmp(arg, "--symbolic")) {
249 symbolic = 1;
250 continue;
251 }
252 if (!strcmp(arg, "--all")) {
253 for_each_ref(show_reference);
254 continue;
255 }
256 if (!strcmp(arg, "--show-prefix")) {
257 if (prefix)
258 puts(prefix);
259 continue;
260 }
261 if (!strcmp(arg, "--show-cdup")) {
262 const char *pfx = prefix;
263 while (pfx) {
264 pfx = strchr(pfx, '/');
265 if (pfx) {
266 pfx++;
267 printf("../");
268 }
269 }
270 putchar('\n');
271 continue;
272 }
273 if (!strcmp(arg, "--git-dir")) {
274 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
275 static char cwd[PATH_MAX];
276 if (gitdir) {
277 puts(gitdir);
278 continue;
279 }
280 if (!prefix) {
281 puts(".git");
282 continue;
283 }
284 if (!getcwd(cwd, PATH_MAX))
285 die("unable to get current working directory");
286 printf("%s/.git\n", cwd);
287 continue;
288 }
289 if (!strncmp(arg, "--since=", 8)) {
290 show_datestring("--max-age=", arg+8);
291 continue;
292 }
293 if (!strncmp(arg, "--after=", 8)) {
294 show_datestring("--max-age=", arg+8);
295 continue;
296 }
297 if (!strncmp(arg, "--before=", 9)) {
298 show_datestring("--min-age=", arg+9);
299 continue;
300 }
301 if (!strncmp(arg, "--until=", 8)) {
302 show_datestring("--min-age=", arg+8);
303 continue;
304 }
305 if (show_flag(arg) && verify)
306 die("Needed a single revision");
307 continue;
308 }
309 /* Not a flag argument */
311 dotdot = strstr(arg, "..");
312 if (dotdot) {
313 unsigned char end[20];
314 char *n = dotdot+2;
315 *dotdot = 0;
316 if (!get_sha1(arg, sha1)) {
317 if (!*n)
318 n = "HEAD";
319 if (!get_sha1(n, end)) {
320 show_rev(NORMAL, end, n);
321 show_rev(REVERSED, sha1, arg);
322 continue;
323 }
324 }
325 *dotdot = '.';
326 }
327 if (!get_sha1(arg, sha1)) {
328 show_rev(NORMAL, sha1, arg);
329 continue;
330 }
331 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
332 show_rev(REVERSED, sha1, arg+1);
333 continue;
334 }
335 as_is = 1;
336 if (!show_file(arg))
337 continue;
338 if (verify)
339 die("Needed a single revision");
340 if (lstat(arg, &st) < 0)
341 die("'%s': %s", arg, strerror(errno));
342 }
343 show_default();
344 if (verify && revs_count != 1)
345 die("Needed a single revision");
346 return 0;
347}