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 for (;;) {
57 const char *str = *p++;
58 int len;
59 if (!str)
60 return 0;
61 len = strlen(str);
62 if (!strcmp(arg, str) ||
63 (str[len-1] == '=' && !strncmp(arg, str, len)))
64 return 1;
65 }
66}
67/* Output argument as a string, either SQ or normal */
69static void show(const char *arg)
70{
71 if (output_sq) {
72 int sq = '\'', ch;
73 putchar(sq);
75 while ((ch = *arg++)) {
76 if (ch == sq)
77 fputs("'\\'", stdout);
78 putchar(ch);
79 }
80 putchar(sq);
81 putchar(' ');
82 }
83 else
84 puts(arg);
85}
86/* Output a revision, only if filter allows it */
88static void show_rev(int type, const unsigned char *sha1, const char *name)
89{
90 if (!(filter & DO_REVS))
91 return;
92 def = NULL;
93 revs_count++;
94 if (type != show_type)
96 putchar('^');
97 if (symbolic && name)
98 show(name);
99 else if (abbrev)
100 show(find_unique_abbrev(sha1, abbrev));
101 else
102 show(sha1_to_hex(sha1));
103}
104/* Output a flag, only if filter allows it. */
106static void show_flag(char *arg)
107{
108 if (!(filter & DO_FLAGS))
109 return;
110 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
111 show(arg);
112}
113static void show_default(void)
115{
116 char *s = def;
117 if (s) {
119 unsigned char sha1[20];
120 def = NULL;
122 if (!get_sha1(s, sha1)) {
123 show_rev(NORMAL, sha1, s);
124 return;
125 }
126 }
127}
128static int show_reference(const char *refname, const unsigned char *sha1)
130{
131 show_rev(NORMAL, sha1, refname);
132 return 0;
133}
134static void show_datestring(const char *flag, const char *datestr)
136{
137 static char buffer[100];
138 /* date handling requires both flags and revs */
140 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
141 return;
142 snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
143 show(buffer);
144}
145static void show_file(const char *arg)
147{
148 show_default();
149 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
150 show(arg);
151}
152int main(int argc, char **argv)
154{
155 int i, as_is = 0, verify = 0;
156 unsigned char sha1[20];
157 const char *prefix = setup_git_directory();
158
159 for (i = 1; i < argc; i++) {
160 struct stat st;
161 char *arg = argv[i];
162 char *dotdot;
163
164 if (as_is) {
165 show_file(arg);
166 continue;
167 }
168 if (*arg == '-') {
169 if (!strcmp(arg, "--")) {
170 as_is = 1;
171 /* Pass on the "--" if we show anything but files.. */
172 if (filter & (DO_FLAGS | DO_REVS))
173 show_file(arg);
174 continue;
175 }
176 if (!strcmp(arg, "--default")) {
177 def = argv[i+1];
178 i++;
179 continue;
180 }
181 if (!strcmp(arg, "--revs-only")) {
182 filter &= ~DO_NOREV;
183 continue;
184 }
185 if (!strcmp(arg, "--no-revs")) {
186 filter &= ~DO_REVS;
187 continue;
188 }
189 if (!strcmp(arg, "--flags")) {
190 filter &= ~DO_NONFLAGS;
191 continue;
192 }
193 if (!strcmp(arg, "--no-flags")) {
194 filter &= ~DO_FLAGS;
195 continue;
196 }
197 if (!strcmp(arg, "--verify")) {
198 filter &= ~(DO_FLAGS|DO_NOREV);
199 verify = 1;
200 continue;
201 }
202 if (!strcmp(arg, "--short") ||
203 !strncmp(arg, "--short=", 9)) {
204 filter &= ~(DO_FLAGS|DO_NOREV);
205 verify = 1;
206 abbrev = DEFAULT_ABBREV;
207 if (arg[8] == '=')
208 abbrev = strtoul(arg + 9, NULL, 10);
209 if (abbrev < MINIMUM_ABBREV)
210 abbrev = MINIMUM_ABBREV;
211 else if (40 <= abbrev)
212 abbrev = 40;
213 continue;
214 }
215 if (!strcmp(arg, "--sq")) {
216 output_sq = 1;
217 continue;
218 }
219 if (!strcmp(arg, "--not")) {
220 show_type ^= REVERSED;
221 continue;
222 }
223 if (!strcmp(arg, "--symbolic")) {
224 symbolic = 1;
225 continue;
226 }
227 if (!strcmp(arg, "--all")) {
228 for_each_ref(show_reference);
229 continue;
230 }
231 if (!strcmp(arg, "--show-prefix")) {
232 if (prefix)
233 puts(prefix);
234 continue;
235 }
236 if (!strcmp(arg, "--show-cdup")) {
237 const char *pfx = prefix;
238 while (pfx) {
239 pfx = strchr(pfx, '/');
240 if (pfx) {
241 pfx++;
242 printf("../");
243 }
244 }
245 putchar('\n');
246 continue;
247 }
248 if (!strcmp(arg, "--git-dir")) {
249 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
250 static char cwd[PATH_MAX];
251 if (gitdir) {
252 puts(gitdir);
253 continue;
254 }
255 if (!prefix) {
256 puts(".git");
257 continue;
258 }
259 if (!getcwd(cwd, PATH_MAX))
260 die("unable to get current working directory");
261 printf("%s/.git\n", cwd);
262 continue;
263 }
264 if (!strncmp(arg, "--since=", 8)) {
265 show_datestring("--max-age=", arg+8);
266 continue;
267 }
268 if (!strncmp(arg, "--after=", 8)) {
269 show_datestring("--max-age=", arg+8);
270 continue;
271 }
272 if (!strncmp(arg, "--before=", 9)) {
273 show_datestring("--min-age=", arg+9);
274 continue;
275 }
276 if (!strncmp(arg, "--until=", 8)) {
277 show_datestring("--min-age=", arg+8);
278 continue;
279 }
280 if (verify)
281 die("Needed a single revision");
282 show_flag(arg);
283 continue;
284 }
285 /* Not a flag argument */
287 dotdot = strstr(arg, "..");
288 if (dotdot) {
289 unsigned char end[20];
290 char *n = dotdot+2;
291 *dotdot = 0;
292 if (!get_sha1(arg, sha1)) {
293 if (!*n)
294 n = "HEAD";
295 if (!get_sha1(n, end)) {
296 show_rev(NORMAL, end, n);
297 show_rev(REVERSED, sha1, arg);
298 continue;
299 }
300 }
301 *dotdot = '.';
302 }
303 if (!get_sha1(arg, sha1)) {
304 show_rev(NORMAL, sha1, arg);
305 continue;
306 }
307 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
308 show_rev(REVERSED, sha1, arg+1);
309 continue;
310 }
311 if (verify)
312 die("Needed a single revision");
313 if ((filter & DO_REVS) &&
314 (filter & DO_NONFLAGS) && /* !def && */
315 lstat(arg, &st) < 0)
316 die("'%s': %s", arg, strerror(errno));
317 as_is = 1;
318 show_file(arg);
319 }
320 show_default();
321 if (verify && revs_count != 1)
322 die("Needed a single revision");
323 return 0;
324}