42969a6fc1b7591b13a2fc664421e4f1da465cdb
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, "--abbrev") ||
203 !strncmp(arg, "--abbrev=", 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 < 0 || 40 <= abbrev)
210 abbrev = DEFAULT_ABBREV;
211 continue;
212 }
213 if (!strcmp(arg, "--sq")) {
214 output_sq = 1;
215 continue;
216 }
217 if (!strcmp(arg, "--not")) {
218 show_type ^= REVERSED;
219 continue;
220 }
221 if (!strcmp(arg, "--symbolic")) {
222 symbolic = 1;
223 continue;
224 }
225 if (!strcmp(arg, "--all")) {
226 for_each_ref(show_reference);
227 continue;
228 }
229 if (!strcmp(arg, "--show-prefix")) {
230 if (prefix)
231 puts(prefix);
232 continue;
233 }
234 if (!strcmp(arg, "--show-cdup")) {
235 const char *pfx = prefix;
236 while (pfx) {
237 pfx = strchr(pfx, '/');
238 if (pfx) {
239 pfx++;
240 printf("../");
241 }
242 }
243 putchar('\n');
244 continue;
245 }
246 if (!strcmp(arg, "--git-dir")) {
247 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
248 static char cwd[PATH_MAX];
249 if (gitdir) {
250 puts(gitdir);
251 continue;
252 }
253 if (!prefix) {
254 puts(".git");
255 continue;
256 }
257 if (!getcwd(cwd, PATH_MAX))
258 die("unable to get current working directory");
259 printf("%s/.git\n", cwd);
260 continue;
261 }
262 if (!strncmp(arg, "--since=", 8)) {
263 show_datestring("--max-age=", arg+8);
264 continue;
265 }
266 if (!strncmp(arg, "--after=", 8)) {
267 show_datestring("--max-age=", arg+8);
268 continue;
269 }
270 if (!strncmp(arg, "--before=", 9)) {
271 show_datestring("--min-age=", arg+9);
272 continue;
273 }
274 if (!strncmp(arg, "--until=", 8)) {
275 show_datestring("--min-age=", arg+8);
276 continue;
277 }
278 if (verify)
279 die("Needed a single revision");
280 show_flag(arg);
281 continue;
282 }
283 /* Not a flag argument */
285 dotdot = strstr(arg, "..");
286 if (dotdot) {
287 unsigned char end[20];
288 char *n = dotdot+2;
289 *dotdot = 0;
290 if (!get_sha1(arg, sha1)) {
291 if (!*n)
292 n = "HEAD";
293 if (!get_sha1(n, end)) {
294 show_rev(NORMAL, end, n);
295 show_rev(REVERSED, sha1, arg);
296 continue;
297 }
298 }
299 *dotdot = '.';
300 }
301 if (!get_sha1(arg, sha1)) {
302 show_rev(NORMAL, sha1, arg);
303 continue;
304 }
305 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
306 show_rev(REVERSED, sha1, arg+1);
307 continue;
308 }
309 if (verify)
310 die("Needed a single revision");
311 if (lstat(arg, &st) < 0)
312 die("'%s': %s", arg, strerror(errno));
313 as_is = 1;
314 show_file(arg);
315 }
316 show_default();
317 if (verify && revs_count != 1)
318 die("Needed a single revision");
319 return 0;
320}