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 output_sq = 0;
24static int revs_count = 0;
26/*
28 * Some arguments are relevant "revision" arguments,
29 * others are about output format or other details.
30 * This sorts it all out.
31 */
32static int is_rev_argument(const char *arg)
33{
34 static const char *rev_args[] = {
35 "--all",
36 "--bisect",
37 "--dense",
38 "--header",
39 "--max-age=",
40 "--max-count=",
41 "--merge-order",
42 "--min-age=",
43 "--no-merges",
44 "--objects",
45 "--parents",
46 "--pretty",
47 "--show-breaks",
48 "--sparse",
49 "--topo-order",
50 "--unpacked",
51 NULL
52 };
53 const char **p = rev_args;
54 for (;;) {
56 const char *str = *p++;
57 int len;
58 if (!str)
59 return 0;
60 len = strlen(str);
61 if (!strcmp(arg, str) ||
62 (str[len-1] == '=' && !strncmp(arg, str, len)))
63 return 1;
64 }
65}
66/* Output argument as a string, either SQ or normal */
68static void show(const char *arg)
69{
70 if (output_sq) {
71 int sq = '\'', ch;
72 putchar(sq);
74 while ((ch = *arg++)) {
75 if (ch == sq)
76 fputs("'\\'", stdout);
77 putchar(ch);
78 }
79 putchar(sq);
80 putchar(' ');
81 }
82 else
83 puts(arg);
84}
85/* Output a revision, only if filter allows it */
87static void show_rev(int type, const unsigned char *sha1, const char *name)
88{
89 if (!(filter & DO_REVS))
90 return;
91 def = NULL;
92 revs_count++;
93 if (type != show_type)
95 putchar('^');
96 if (symbolic && name)
97 show(name);
98 else
99 show(sha1_to_hex(sha1));
100}
101/* Output a flag, only if filter allows it. */
103static void show_flag(char *arg)
104{
105 if (!(filter & DO_FLAGS))
106 return;
107 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
108 show(arg);
109}
110static void show_default(void)
112{
113 char *s = def;
114 if (s) {
116 unsigned char sha1[20];
117 def = NULL;
119 if (!get_sha1(s, sha1)) {
120 show_rev(NORMAL, sha1, s);
121 return;
122 }
123 }
124}
125static int show_reference(const char *refname, const unsigned char *sha1)
127{
128 show_rev(NORMAL, sha1, refname);
129 return 0;
130}
131static void show_datestring(const char *flag, const char *datestr)
133{
134 static char buffer[100];
135 /* date handling requires both flags and revs */
137 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
138 return;
139 snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
140 show(buffer);
141}
142static void show_file(const char *arg)
144{
145 show_default();
146 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
147 show(arg);
148}
149int main(int argc, char **argv)
151{
152 int i, as_is = 0, verify = 0;
153 unsigned char sha1[20];
154 const char *prefix = setup_git_directory();
155
156 for (i = 1; i < argc; i++) {
157 struct stat st;
158 char *arg = argv[i];
159 char *dotdot;
160
161 if (as_is) {
162 show_file(arg);
163 continue;
164 }
165 if (*arg == '-') {
166 if (!strcmp(arg, "--")) {
167 as_is = 1;
168 /* Pass on the "--" if we show anything but files.. */
169 if (filter & (DO_FLAGS | DO_REVS))
170 show_file(arg);
171 continue;
172 }
173 if (!strcmp(arg, "--default")) {
174 def = argv[i+1];
175 i++;
176 continue;
177 }
178 if (!strcmp(arg, "--revs-only")) {
179 filter &= ~DO_NOREV;
180 continue;
181 }
182 if (!strcmp(arg, "--no-revs")) {
183 filter &= ~DO_REVS;
184 continue;
185 }
186 if (!strcmp(arg, "--flags")) {
187 filter &= ~DO_NONFLAGS;
188 continue;
189 }
190 if (!strcmp(arg, "--no-flags")) {
191 filter &= ~DO_FLAGS;
192 continue;
193 }
194 if (!strcmp(arg, "--verify")) {
195 filter &= ~(DO_FLAGS|DO_NOREV);
196 verify = 1;
197 continue;
198 }
199 if (!strcmp(arg, "--sq")) {
200 output_sq = 1;
201 continue;
202 }
203 if (!strcmp(arg, "--not")) {
204 show_type ^= REVERSED;
205 continue;
206 }
207 if (!strcmp(arg, "--symbolic")) {
208 symbolic = 1;
209 continue;
210 }
211 if (!strcmp(arg, "--all")) {
212 for_each_ref(show_reference);
213 continue;
214 }
215 if (!strcmp(arg, "--show-prefix")) {
216 if (prefix)
217 puts(prefix);
218 continue;
219 }
220 if (!strcmp(arg, "--show-cdup")) {
221 const char *pfx = prefix;
222 while (pfx) {
223 pfx = strchr(pfx, '/');
224 if (pfx) {
225 pfx++;
226 printf("../");
227 }
228 }
229 putchar('\n');
230 continue;
231 }
232 if (!strcmp(arg, "--git-dir")) {
233 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
234 static char cwd[PATH_MAX];
235 if (gitdir) {
236 puts(gitdir);
237 continue;
238 }
239 if (!prefix) {
240 puts(".git");
241 continue;
242 }
243 if (!getcwd(cwd, PATH_MAX))
244 die("unable to get current working directory");
245 printf("%s/.git\n", cwd);
246 continue;
247 }
248 if (!strncmp(arg, "--since=", 8)) {
249 show_datestring("--max-age=", arg+8);
250 continue;
251 }
252 if (!strncmp(arg, "--after=", 8)) {
253 show_datestring("--max-age=", arg+8);
254 continue;
255 }
256 if (!strncmp(arg, "--before=", 9)) {
257 show_datestring("--min-age=", arg+9);
258 continue;
259 }
260 if (!strncmp(arg, "--until=", 8)) {
261 show_datestring("--min-age=", arg+8);
262 continue;
263 }
264 if (verify)
265 die("Needed a single revision");
266 show_flag(arg);
267 continue;
268 }
269 /* Not a flag argument */
271 dotdot = strstr(arg, "..");
272 if (dotdot) {
273 unsigned char end[20];
274 char *n = dotdot+2;
275 *dotdot = 0;
276 if (!get_sha1(arg, sha1)) {
277 if (!*n)
278 n = "HEAD";
279 if (!get_sha1(n, end)) {
280 show_rev(NORMAL, end, n);
281 show_rev(REVERSED, sha1, arg);
282 continue;
283 }
284 }
285 *dotdot = '.';
286 }
287 if (!get_sha1(arg, sha1)) {
288 show_rev(NORMAL, sha1, arg);
289 continue;
290 }
291 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
292 show_rev(REVERSED, sha1, arg+1);
293 continue;
294 }
295 if (verify)
296 die("Needed a single revision");
297 if (lstat(arg, &st) < 0)
298 die("'%s': %s", arg, strerror(errno));
299 as_is = 1;
300 show_file(arg);
301 }
302 show_default();
303 if (verify && revs_count != 1)
304 die("Needed a single revision");
305 return 0;
306}