Merge in fixes up to 1.0.3 maintenance branch.
[git/git.git] / rev-parse.c
CommitLineData
178cb243
LT
1/*
2 * rev-parse.c
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6#include "cache.h"
a8be83fe 7#include "commit.h"
960bba0d 8#include "refs.h"
c1babb1d 9#include "quote.h"
a8be83fe 10
4866ccf0
JH
11#define DO_REVS 1
12#define DO_NOREV 2
13#define DO_FLAGS 4
14#define DO_NONFLAGS 8
15static int filter = ~0;
16
023d66ed 17static char *def = NULL;
023d66ed 18
042a4ed7
LT
19#define NORMAL 0
20#define REVERSED 1
21static int show_type = NORMAL;
4866ccf0
JH
22static int symbolic = 0;
23static int output_sq = 0;
24
25static int revs_count = 0;
042a4ed7 26
921d865e
LT
27/*
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[] = {
e091eb93 35 "--all",
4866ccf0 36 "--bisect",
5a83f3be 37 "--dense",
4866ccf0 38 "--header",
921d865e 39 "--max-age=",
4866ccf0 40 "--max-count=",
921d865e 41 "--merge-order",
4866ccf0 42 "--min-age=",
5ccfb758 43 "--no-merges",
4866ccf0
JH
44 "--objects",
45 "--parents",
46 "--pretty",
47 "--show-breaks",
5a83f3be 48 "--sparse",
4866ccf0
JH
49 "--topo-order",
50 "--unpacked",
921d865e
LT
51 NULL
52 };
53 const char **p = rev_args;
54
55 for (;;) {
56 const char *str = *p++;
57 int len;
58 if (!str)
59 return 0;
60 len = strlen(str);
4866ccf0
JH
61 if (!strcmp(arg, str) ||
62 (str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e
LT
63 return 1;
64 }
65}
66
4866ccf0 67/* Output argument as a string, either SQ or normal */
5bb2c65a
JH
68static void show(const char *arg)
69{
70 if (output_sq) {
71 int sq = '\'', ch;
72
73 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
4866ccf0 86/* Output a revision, only if filter allows it */
30b96fce 87static void show_rev(int type, const unsigned char *sha1, const char *name)
023d66ed 88{
4866ccf0 89 if (!(filter & DO_REVS))
023d66ed 90 return;
4866ccf0
JH
91 def = NULL;
92 revs_count++;
5bb2c65a 93
30b96fce
JH
94 if (type != show_type)
95 putchar('^');
96 if (symbolic && name)
97 show(name);
98 else
99 show(sha1_to_hex(sha1));
023d66ed
LT
100}
101
4866ccf0
JH
102/* Output a flag, only if filter allows it. */
103static void show_flag(char *arg)
023d66ed 104{
4866ccf0 105 if (!(filter & DO_FLAGS))
023d66ed 106 return;
4866ccf0 107 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
0360e99d 108 show(arg);
023d66ed
LT
109}
110
023d66ed
LT
111static void show_default(void)
112{
113 char *s = def;
114
115 if (s) {
116 unsigned char sha1[20];
117
118 def = NULL;
9938af6a 119 if (!get_sha1(s, sha1)) {
30b96fce 120 show_rev(NORMAL, sha1, s);
023d66ed
LT
121 return;
122 }
023d66ed
LT
123 }
124}
125
960bba0d
LT
126static int show_reference(const char *refname, const unsigned char *sha1)
127{
30b96fce 128 show_rev(NORMAL, sha1, refname);
960bba0d
LT
129 return 0;
130}
131
c1babb1d
LT
132static void show_datestring(const char *flag, const char *datestr)
133{
c1babb1d 134 static char buffer[100];
c1babb1d
LT
135
136 /* date handling requires both flags and revs */
137 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
138 return;
3c07b1d1 139 snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
c1babb1d
LT
140 show(buffer);
141}
142
7a3dd472
LT
143static void show_file(const char *arg)
144{
7b34c2fa 145 show_default();
7a3dd472
LT
146 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
147 show(arg);
148}
149
178cb243
LT
150int main(int argc, char **argv)
151{
4866ccf0 152 int i, as_is = 0, verify = 0;
178cb243 153 unsigned char sha1[20];
d288a700
LT
154 const char *prefix = setup_git_directory();
155
178cb243
LT
156 for (i = 1; i < argc; i++) {
157 char *arg = argv[i];
158 char *dotdot;
159
160 if (as_is) {
7a3dd472 161 show_file(arg);
178cb243
LT
162 continue;
163 }
164 if (*arg == '-') {
165 if (!strcmp(arg, "--")) {
178cb243 166 as_is = 1;
a08b6505
LT
167 /* Pass on the "--" if we show anything but files.. */
168 if (filter & (DO_FLAGS | DO_REVS))
169 show_file(arg);
4866ccf0 170 continue;
178cb243
LT
171 }
172 if (!strcmp(arg, "--default")) {
178cb243
LT
173 def = argv[i+1];
174 i++;
175 continue;
176 }
8ebb0184 177 if (!strcmp(arg, "--revs-only")) {
4866ccf0 178 filter &= ~DO_NOREV;
8ebb0184
LT
179 continue;
180 }
181 if (!strcmp(arg, "--no-revs")) {
4866ccf0 182 filter &= ~DO_REVS;
8ebb0184
LT
183 continue;
184 }
f79b65aa 185 if (!strcmp(arg, "--flags")) {
4866ccf0 186 filter &= ~DO_NONFLAGS;
f79b65aa
LT
187 continue;
188 }
189 if (!strcmp(arg, "--no-flags")) {
4866ccf0 190 filter &= ~DO_FLAGS;
f79b65aa
LT
191 continue;
192 }
023d66ed 193 if (!strcmp(arg, "--verify")) {
4866ccf0
JH
194 filter &= ~(DO_FLAGS|DO_NOREV);
195 verify = 1;
023d66ed 196 continue;
921d865e 197 }
5bb2c65a
JH
198 if (!strcmp(arg, "--sq")) {
199 output_sq = 1;
200 continue;
201 }
042a4ed7
LT
202 if (!strcmp(arg, "--not")) {
203 show_type ^= REVERSED;
204 continue;
205 }
30b96fce
JH
206 if (!strcmp(arg, "--symbolic")) {
207 symbolic = 1;
208 continue;
209 }
960bba0d
LT
210 if (!strcmp(arg, "--all")) {
211 for_each_ref(show_reference);
212 continue;
213 }
d288a700 214 if (!strcmp(arg, "--show-prefix")) {
4866ccf0
JH
215 if (prefix)
216 puts(prefix);
d288a700
LT
217 continue;
218 }
a8783eeb
LT
219 if (!strcmp(arg, "--git-dir")) {
220 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
221 static char cwd[PATH_MAX];
222 if (gitdir) {
223 puts(gitdir);
224 continue;
225 }
226 if (!prefix) {
227 puts(".git");
228 continue;
229 }
230 if (!getcwd(cwd, PATH_MAX))
231 die("unable to get current working directory");
232 printf("%s/.git\n", cwd);
233 continue;
234 }
c1babb1d
LT
235 if (!strncmp(arg, "--since=", 8)) {
236 show_datestring("--max-age=", arg+8);
237 continue;
238 }
239 if (!strncmp(arg, "--after=", 8)) {
240 show_datestring("--max-age=", arg+8);
241 continue;
242 }
243 if (!strncmp(arg, "--before=", 9)) {
244 show_datestring("--min-age=", arg+9);
245 continue;
246 }
247 if (!strncmp(arg, "--until=", 8)) {
248 show_datestring("--min-age=", arg+8);
249 continue;
250 }
4866ccf0
JH
251 if (verify)
252 die("Needed a single revision");
253 show_flag(arg);
178cb243
LT
254 continue;
255 }
4866ccf0
JH
256
257 /* Not a flag argument */
178cb243
LT
258 dotdot = strstr(arg, "..");
259 if (dotdot) {
260 unsigned char end[20];
261 char *n = dotdot+2;
262 *dotdot = 0;
9938af6a 263 if (!get_sha1(arg, sha1)) {
178cb243
LT
264 if (!*n)
265 n = "HEAD";
9938af6a 266 if (!get_sha1(n, end)) {
30b96fce
JH
267 show_rev(NORMAL, end, n);
268 show_rev(REVERSED, sha1, arg);
178cb243
LT
269 continue;
270 }
271 }
272 *dotdot = '.';
273 }
9938af6a 274 if (!get_sha1(arg, sha1)) {
30b96fce 275 show_rev(NORMAL, sha1, arg);
800644c5
LT
276 continue;
277 }
9938af6a 278 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce 279 show_rev(REVERSED, sha1, arg+1);
800644c5
LT
280 continue;
281 }
4866ccf0
JH
282 if (verify)
283 die("Needed a single revision");
af13cdf2 284 as_is = 1;
7a3dd472 285 show_file(arg);
023d66ed
LT
286 }
287 show_default();
4866ccf0
JH
288 if (verify && revs_count != 1)
289 die("Needed a single revision");
178cb243
LT
290 return 0;
291}