Forward port the "funny ref avoidance" in clone and fetch from maint 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
JH
36 "--bisect",
37 "--header",
921d865e 38 "--max-age=",
4866ccf0 39 "--max-count=",
921d865e 40 "--merge-order",
4866ccf0 41 "--min-age=",
5ccfb758 42 "--no-merges",
4866ccf0
JH
43 "--objects",
44 "--parents",
45 "--pretty",
46 "--show-breaks",
47 "--topo-order",
48 "--unpacked",
921d865e
LT
49 NULL
50 };
51 const char **p = rev_args;
52
53 for (;;) {
54 const char *str = *p++;
55 int len;
56 if (!str)
57 return 0;
58 len = strlen(str);
4866ccf0
JH
59 if (!strcmp(arg, str) ||
60 (str[len-1] == '=' && !strncmp(arg, str, len)))
921d865e
LT
61 return 1;
62 }
63}
64
4866ccf0 65/* Output argument as a string, either SQ or normal */
5bb2c65a
JH
66static void show(const char *arg)
67{
68 if (output_sq) {
69 int sq = '\'', ch;
70
71 putchar(sq);
72 while ((ch = *arg++)) {
73 if (ch == sq)
74 fputs("'\\'", stdout);
75 putchar(ch);
76 }
77 putchar(sq);
78 putchar(' ');
79 }
80 else
81 puts(arg);
82}
83
4866ccf0 84/* Output a revision, only if filter allows it */
30b96fce 85static void show_rev(int type, const unsigned char *sha1, const char *name)
023d66ed 86{
4866ccf0 87 if (!(filter & DO_REVS))
023d66ed 88 return;
4866ccf0
JH
89 def = NULL;
90 revs_count++;
5bb2c65a 91
30b96fce
JH
92 if (type != show_type)
93 putchar('^');
94 if (symbolic && name)
95 show(name);
96 else
97 show(sha1_to_hex(sha1));
023d66ed
LT
98}
99
4866ccf0
JH
100/* Output a flag, only if filter allows it. */
101static void show_flag(char *arg)
023d66ed 102{
4866ccf0 103 if (!(filter & DO_FLAGS))
023d66ed 104 return;
4866ccf0 105 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
0360e99d 106 show(arg);
023d66ed
LT
107}
108
023d66ed
LT
109static void show_default(void)
110{
111 char *s = def;
112
113 if (s) {
114 unsigned char sha1[20];
115
116 def = NULL;
9938af6a 117 if (!get_sha1(s, sha1)) {
30b96fce 118 show_rev(NORMAL, sha1, s);
023d66ed
LT
119 return;
120 }
023d66ed
LT
121 }
122}
123
960bba0d
LT
124static int show_reference(const char *refname, const unsigned char *sha1)
125{
30b96fce 126 show_rev(NORMAL, sha1, refname);
960bba0d
LT
127 return 0;
128}
129
c1babb1d
LT
130static void show_datestring(const char *flag, const char *datestr)
131{
132 FILE *date;
133 static char buffer[100];
134 static char cmd[1000];
135 int len;
136
137 /* date handling requires both flags and revs */
138 if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
139 return;
140 len = strlen(flag);
141 memcpy(buffer, flag, len);
142
143 snprintf(cmd, sizeof(cmd), "date --date=%s +%%s", sq_quote(datestr));
144 date = popen(cmd, "r");
145 if (!date || !fgets(buffer + len, sizeof(buffer) - len, date))
146 die("git-rev-list: bad date string");
147 pclose(date);
148 len = strlen(buffer);
149 if (buffer[len-1] == '\n')
150 buffer[--len] = 0;
151 show(buffer);
152}
153
178cb243
LT
154int main(int argc, char **argv)
155{
4866ccf0 156 int i, as_is = 0, verify = 0;
178cb243 157 unsigned char sha1[20];
d288a700
LT
158 const char *prefix = setup_git_directory();
159
178cb243
LT
160 for (i = 1; i < argc; i++) {
161 char *arg = argv[i];
162 char *dotdot;
163
164 if (as_is) {
4866ccf0 165 show(arg);
178cb243
LT
166 continue;
167 }
168 if (*arg == '-') {
169 if (!strcmp(arg, "--")) {
178cb243 170 as_is = 1;
4866ccf0 171 continue;
178cb243
LT
172 }
173 if (!strcmp(arg, "--default")) {
178cb243
LT
174 def = argv[i+1];
175 i++;
176 continue;
177 }
8ebb0184 178 if (!strcmp(arg, "--revs-only")) {
4866ccf0 179 filter &= ~DO_NOREV;
8ebb0184
LT
180 continue;
181 }
182 if (!strcmp(arg, "--no-revs")) {
4866ccf0 183 filter &= ~DO_REVS;
8ebb0184
LT
184 continue;
185 }
f79b65aa 186 if (!strcmp(arg, "--flags")) {
4866ccf0 187 filter &= ~DO_NONFLAGS;
f79b65aa
LT
188 continue;
189 }
190 if (!strcmp(arg, "--no-flags")) {
4866ccf0 191 filter &= ~DO_FLAGS;
f79b65aa
LT
192 continue;
193 }
023d66ed 194 if (!strcmp(arg, "--verify")) {
4866ccf0
JH
195 filter &= ~(DO_FLAGS|DO_NOREV);
196 verify = 1;
023d66ed 197 continue;
921d865e 198 }
5bb2c65a
JH
199 if (!strcmp(arg, "--sq")) {
200 output_sq = 1;
201 continue;
202 }
042a4ed7
LT
203 if (!strcmp(arg, "--not")) {
204 show_type ^= REVERSED;
205 continue;
206 }
30b96fce
JH
207 if (!strcmp(arg, "--symbolic")) {
208 symbolic = 1;
209 continue;
210 }
960bba0d
LT
211 if (!strcmp(arg, "--all")) {
212 for_each_ref(show_reference);
213 continue;
214 }
d288a700 215 if (!strcmp(arg, "--show-prefix")) {
4866ccf0
JH
216 if (prefix)
217 puts(prefix);
d288a700
LT
218 continue;
219 }
a8783eeb
LT
220 if (!strcmp(arg, "--git-dir")) {
221 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
222 static char cwd[PATH_MAX];
223 if (gitdir) {
224 puts(gitdir);
225 continue;
226 }
227 if (!prefix) {
228 puts(".git");
229 continue;
230 }
231 if (!getcwd(cwd, PATH_MAX))
232 die("unable to get current working directory");
233 printf("%s/.git\n", cwd);
234 continue;
235 }
c1babb1d
LT
236 if (!strncmp(arg, "--since=", 8)) {
237 show_datestring("--max-age=", arg+8);
238 continue;
239 }
240 if (!strncmp(arg, "--after=", 8)) {
241 show_datestring("--max-age=", arg+8);
242 continue;
243 }
244 if (!strncmp(arg, "--before=", 9)) {
245 show_datestring("--min-age=", arg+9);
246 continue;
247 }
248 if (!strncmp(arg, "--until=", 8)) {
249 show_datestring("--min-age=", arg+8);
250 continue;
251 }
4866ccf0
JH
252 if (verify)
253 die("Needed a single revision");
254 show_flag(arg);
178cb243
LT
255 continue;
256 }
4866ccf0
JH
257
258 /* Not a flag argument */
178cb243
LT
259 dotdot = strstr(arg, "..");
260 if (dotdot) {
261 unsigned char end[20];
262 char *n = dotdot+2;
263 *dotdot = 0;
9938af6a 264 if (!get_sha1(arg, sha1)) {
178cb243
LT
265 if (!*n)
266 n = "HEAD";
9938af6a 267 if (!get_sha1(n, end)) {
30b96fce
JH
268 show_rev(NORMAL, end, n);
269 show_rev(REVERSED, sha1, arg);
178cb243
LT
270 continue;
271 }
272 }
273 *dotdot = '.';
274 }
9938af6a 275 if (!get_sha1(arg, sha1)) {
30b96fce 276 show_rev(NORMAL, sha1, arg);
800644c5
LT
277 continue;
278 }
9938af6a 279 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
30b96fce 280 show_rev(REVERSED, sha1, arg+1);
800644c5
LT
281 continue;
282 }
4866ccf0
JH
283 if (verify)
284 die("Needed a single revision");
285 if ((filter & (DO_NONFLAGS|DO_NOREV)) ==
286 (DO_NONFLAGS|DO_NOREV))
287 show(arg);
023d66ed
LT
288 }
289 show_default();
4866ccf0
JH
290 if (verify && revs_count != 1)
291 die("Needed a single revision");
178cb243
LT
292 return 0;
293}