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}
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 git_config(git_default_config);
170 for (i = 1; i < argc; i++) {
172 struct stat st;
173 char *arg = argv[i];
174 char *dotdot;
175
176 if (as_is) {
177 show_file(arg);
178 continue;
179 }
180 if (!strcmp(arg,"-n")) {
181 if (++i >= argc)
182 die("-n requires an argument");
183 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
184 show(arg);
185 show(argv[i]);
186 }
187 continue;
188 }
189 if (!strncmp(arg,"-n",2)) {
190 if ((filter & DO_FLAGS) && (filter & DO_REVS))
191 show(arg);
192 continue;
193 }
194 if (*arg == '-') {
196 if (!strcmp(arg, "--")) {
197 as_is = 1;
198 /* Pass on the "--" if we show anything but files.. */
199 if (filter & (DO_FLAGS | DO_REVS))
200 show_file(arg);
201 continue;
202 }
203 if (!strcmp(arg, "--default")) {
204 def = argv[i+1];
205 i++;
206 continue;
207 }
208 if (!strcmp(arg, "--revs-only")) {
209 filter &= ~DO_NOREV;
210 continue;
211 }
212 if (!strcmp(arg, "--no-revs")) {
213 filter &= ~DO_REVS;
214 continue;
215 }
216 if (!strcmp(arg, "--flags")) {
217 filter &= ~DO_NONFLAGS;
218 continue;
219 }
220 if (!strcmp(arg, "--no-flags")) {
221 filter &= ~DO_FLAGS;
222 continue;
223 }
224 if (!strcmp(arg, "--verify")) {
225 filter &= ~(DO_FLAGS|DO_NOREV);
226 verify = 1;
227 continue;
228 }
229 if (!strcmp(arg, "--short") ||
230 !strncmp(arg, "--short=", 8)) {
231 filter &= ~(DO_FLAGS|DO_NOREV);
232 verify = 1;
233 abbrev = DEFAULT_ABBREV;
234 if (arg[7] == '=')
235 abbrev = strtoul(arg + 8, NULL, 10);
236 if (abbrev < MINIMUM_ABBREV)
237 abbrev = MINIMUM_ABBREV;
238 else if (40 <= abbrev)
239 abbrev = 40;
240 continue;
241 }
242 if (!strcmp(arg, "--sq")) {
243 output_sq = 1;
244 continue;
245 }
246 if (!strcmp(arg, "--not")) {
247 show_type ^= REVERSED;
248 continue;
249 }
250 if (!strcmp(arg, "--symbolic")) {
251 symbolic = 1;
252 continue;
253 }
254 if (!strcmp(arg, "--all")) {
255 for_each_ref(show_reference);
256 continue;
257 }
258 if (!strcmp(arg, "--show-prefix")) {
259 if (prefix)
260 puts(prefix);
261 continue;
262 }
263 if (!strcmp(arg, "--show-cdup")) {
264 const char *pfx = prefix;
265 while (pfx) {
266 pfx = strchr(pfx, '/');
267 if (pfx) {
268 pfx++;
269 printf("../");
270 }
271 }
272 putchar('\n');
273 continue;
274 }
275 if (!strcmp(arg, "--git-dir")) {
276 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
277 static char cwd[PATH_MAX];
278 if (gitdir) {
279 puts(gitdir);
280 continue;
281 }
282 if (!prefix) {
283 puts(".git");
284 continue;
285 }
286 if (!getcwd(cwd, PATH_MAX))
287 die("unable to get current working directory");
288 printf("%s/.git\n", cwd);
289 continue;
290 }
291 if (!strncmp(arg, "--since=", 8)) {
292 show_datestring("--max-age=", arg+8);
293 continue;
294 }
295 if (!strncmp(arg, "--after=", 8)) {
296 show_datestring("--max-age=", arg+8);
297 continue;
298 }
299 if (!strncmp(arg, "--before=", 9)) {
300 show_datestring("--min-age=", arg+9);
301 continue;
302 }
303 if (!strncmp(arg, "--until=", 8)) {
304 show_datestring("--min-age=", arg+8);
305 continue;
306 }
307 if (show_flag(arg) && verify)
308 die("Needed a single revision");
309 continue;
310 }
311 /* Not a flag argument */
313 dotdot = strstr(arg, "..");
314 if (dotdot) {
315 unsigned char end[20];
316 char *n = dotdot+2;
317 *dotdot = 0;
318 if (!get_sha1(arg, sha1)) {
319 if (!*n)
320 n = "HEAD";
321 if (!get_sha1(n, end)) {
322 show_rev(NORMAL, end, n);
323 show_rev(REVERSED, sha1, arg);
324 continue;
325 }
326 }
327 *dotdot = '.';
328 }
329 if (!get_sha1(arg, sha1)) {
330 show_rev(NORMAL, sha1, arg);
331 continue;
332 }
333 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
334 show_rev(REVERSED, sha1, arg+1);
335 continue;
336 }
337 as_is = 1;
338 if (!show_file(arg))
339 continue;
340 if (verify)
341 die("Needed a single revision");
342 if (lstat(arg, &st) < 0)
343 die("'%s': %s", arg, strerror(errno));
344 }
345 show_default();
346 if (verify && revs_count != 1)
347 die("Needed a single revision");
348 return 0;
349}