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 "--date-order",
52 "--unpacked",
53 NULL
54 };
55 const char **p = rev_args;
56 /* accept -<digit>, like traditional "head" */
58 if ((*arg == '-') && isdigit(arg[1]))
59 return 1;
60 for (;;) {
62 const char *str = *p++;
63 int len;
64 if (!str)
65 return 0;
66 len = strlen(str);
67 if (!strcmp(arg, str) ||
68 (str[len-1] == '=' && !strncmp(arg, str, len)))
69 return 1;
70 }
71}
72/* Output argument as a string, either SQ or normal */
74static void show(const char *arg)
75{
76 if (output_sq) {
77 int sq = '\'', ch;
78 putchar(sq);
80 while ((ch = *arg++)) {
81 if (ch == sq)
82 fputs("'\\'", stdout);
83 putchar(ch);
84 }
85 putchar(sq);
86 putchar(' ');
87 }
88 else
89 puts(arg);
90}
91/* Output a revision, only if filter allows it */
93static void show_rev(int type, const unsigned char *sha1, const char *name)
94{
95 if (!(filter & DO_REVS))
96 return;
97 def = NULL;
98 revs_count++;
99 if (type != show_type)
101 putchar('^');
102 if (symbolic && name)
103 show(name);
104 else if (abbrev)
105 show(find_unique_abbrev(sha1, abbrev));
106 else
107 show(sha1_to_hex(sha1));
108}
109/* Output a flag, only if filter allows it. */
111static int show_flag(char *arg)
112{
113 if (!(filter & DO_FLAGS))
114 return 0;
115 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
116 show(arg);
117 return 1;
118 }
119 return 0;
120}
121static void show_default(void)
123{
124 char *s = def;
125 if (s) {
127 unsigned char sha1[20];
128 def = NULL;
130 if (!get_sha1(s, sha1)) {
131 show_rev(NORMAL, sha1, s);
132 return;
133 }
134 }
135}
136static int show_reference(const char *refname, const unsigned char *sha1)
138{
139 show_rev(NORMAL, sha1, refname);
140 return 0;
141}
142static void show_datestring(const char *flag, const char *datestr)
144{
145 static char buffer[100];
146 /* date handling requires both flags and revs */
148 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
149 return;
150 snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
151 show(buffer);
152}
153static int show_file(const char *arg)
155{
156 show_default();
157 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
158 show(arg);
159 return 1;
160 }
161 return 0;
162}
163int main(int argc, char **argv)
165{
166 int i, as_is = 0, verify = 0;
167 unsigned char sha1[20];
168 const char *prefix = setup_git_directory();
169
170 for (i = 1; i < argc; i++) {
171 struct stat st;
172 char *arg = argv[i];
173 char *dotdot;
174
175 if (as_is) {
176 show_file(arg);
177 continue;
178 }
179 if (!strcmp(arg,"-n")) {
180 if (++i >= argc)
181 die("-n requires an argument");
182 if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
183 show(arg);
184 show(argv[i]);
185 }
186 continue;
187 }
188 if (!strncmp(arg,"-n",2)) {
189 if ((filter & DO_FLAGS) && (filter & DO_REVS))
190 show(arg);
191 continue;
192 }
193 if (*arg == '-') {
195 if (!strcmp(arg, "--")) {
196 as_is = 1;
197 /* Pass on the "--" if we show anything but files.. */
198 if (filter & (DO_FLAGS | DO_REVS))
199 show_file(arg);
200 continue;
201 }
202 if (!strcmp(arg, "--default")) {
203 def = argv[i+1];
204 i++;
205 continue;
206 }
207 if (!strcmp(arg, "--revs-only")) {
208 filter &= ~DO_NOREV;
209 continue;
210 }
211 if (!strcmp(arg, "--no-revs")) {
212 filter &= ~DO_REVS;
213 continue;
214 }
215 if (!strcmp(arg, "--flags")) {
216 filter &= ~DO_NONFLAGS;
217 continue;
218 }
219 if (!strcmp(arg, "--no-flags")) {
220 filter &= ~DO_FLAGS;
221 continue;
222 }
223 if (!strcmp(arg, "--verify")) {
224 filter &= ~(DO_FLAGS|DO_NOREV);
225 verify = 1;
226 continue;
227 }
228 if (!strcmp(arg, "--short") ||
229 !strncmp(arg, "--short=", 8)) {
230 filter &= ~(DO_FLAGS|DO_NOREV);
231 verify = 1;
232 abbrev = DEFAULT_ABBREV;
233 if (arg[7] == '=')
234 abbrev = strtoul(arg + 8, NULL, 10);
235 if (abbrev < MINIMUM_ABBREV)
236 abbrev = MINIMUM_ABBREV;
237 else if (40 <= abbrev)
238 abbrev = 40;
239 continue;
240 }
241 if (!strcmp(arg, "--sq")) {
242 output_sq = 1;
243 continue;
244 }
245 if (!strcmp(arg, "--not")) {
246 show_type ^= REVERSED;
247 continue;
248 }
249 if (!strcmp(arg, "--symbolic")) {
250 symbolic = 1;
251 continue;
252 }
253 if (!strcmp(arg, "--all")) {
254 for_each_ref(show_reference);
255 continue;
256 }
257 if (!strcmp(arg, "--show-prefix")) {
258 if (prefix)
259 puts(prefix);
260 continue;
261 }
262 if (!strcmp(arg, "--show-cdup")) {
263 const char *pfx = prefix;
264 while (pfx) {
265 pfx = strchr(pfx, '/');
266 if (pfx) {
267 pfx++;
268 printf("../");
269 }
270 }
271 putchar('\n');
272 continue;
273 }
274 if (!strcmp(arg, "--git-dir")) {
275 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
276 static char cwd[PATH_MAX];
277 if (gitdir) {
278 puts(gitdir);
279 continue;
280 }
281 if (!prefix) {
282 puts(".git");
283 continue;
284 }
285 if (!getcwd(cwd, PATH_MAX))
286 die("unable to get current working directory");
287 printf("%s/.git\n", cwd);
288 continue;
289 }
290 if (!strncmp(arg, "--since=", 8)) {
291 show_datestring("--max-age=", arg+8);
292 continue;
293 }
294 if (!strncmp(arg, "--after=", 8)) {
295 show_datestring("--max-age=", arg+8);
296 continue;
297 }
298 if (!strncmp(arg, "--before=", 9)) {
299 show_datestring("--min-age=", arg+9);
300 continue;
301 }
302 if (!strncmp(arg, "--until=", 8)) {
303 show_datestring("--min-age=", arg+8);
304 continue;
305 }
306 if (show_flag(arg) && verify)
307 die("Needed a single revision");
308 continue;
309 }
310 /* Not a flag argument */
312 dotdot = strstr(arg, "..");
313 if (dotdot) {
314 unsigned char end[20];
315 char *n = dotdot+2;
316 *dotdot = 0;
317 if (!get_sha1(arg, sha1)) {
318 if (!*n)
319 n = "HEAD";
320 if (!get_sha1(n, end)) {
321 show_rev(NORMAL, end, n);
322 show_rev(REVERSED, sha1, arg);
323 continue;
324 }
325 }
326 *dotdot = '.';
327 }
328 if (!get_sha1(arg, sha1)) {
329 show_rev(NORMAL, sha1, arg);
330 continue;
331 }
332 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
333 show_rev(REVERSED, sha1, arg+1);
334 continue;
335 }
336 as_is = 1;
337 if (!show_file(arg))
338 continue;
339 if (verify)
340 die("Needed a single revision");
341 if (lstat(arg, &st) < 0)
342 die("'%s': %s", arg, strerror(errno));
343 }
344 show_default();
345 if (verify && revs_count != 1)
346 die("Needed a single revision");
347 return 0;
348}