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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 | ||
11 | #define DO_REVS 1 | |
12 | #define DO_NOREV 2 | |
13 | #define DO_FLAGS 4 | |
14 | #define DO_NONFLAGS 8 | |
15 | static int filter = ~0; | |
16 | ||
17 | static char *def = NULL; | |
18 | ||
19 | #define NORMAL 0 | |
20 | #define REVERSED 1 | |
21 | static int show_type = NORMAL; | |
22 | static int symbolic = 0; | |
23 | static int output_sq = 0; | |
24 | ||
25 | static int revs_count = 0; | |
26 | ||
27 | /* | |
28 | * Some arguments are relevant "revision" arguments, | |
29 | * others are about output format or other details. | |
30 | * This sorts it all out. | |
31 | */ | |
32 | static 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 | ||
55 | 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 | ||
67 | /* Output argument as a string, either SQ or normal */ | |
68 | static 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 | ||
86 | /* Output a revision, only if filter allows it */ | |
87 | static 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 | ||
94 | if (type != show_type) | |
95 | putchar('^'); | |
96 | if (symbolic && name) | |
97 | show(name); | |
98 | else | |
99 | show(sha1_to_hex(sha1)); | |
100 | } | |
101 | ||
102 | /* Output a flag, only if filter allows it. */ | |
103 | static 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 | } | |
110 | ||
111 | static void show_default(void) | |
112 | { | |
113 | char *s = def; | |
114 | ||
115 | if (s) { | |
116 | unsigned char sha1[20]; | |
117 | ||
118 | def = NULL; | |
119 | if (!get_sha1(s, sha1)) { | |
120 | show_rev(NORMAL, sha1, s); | |
121 | return; | |
122 | } | |
123 | } | |
124 | } | |
125 | ||
126 | static int show_reference(const char *refname, const unsigned char *sha1) | |
127 | { | |
128 | show_rev(NORMAL, sha1, refname); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static void show_datestring(const char *flag, const char *datestr) | |
133 | { | |
134 | static char buffer[100]; | |
135 | ||
136 | /* 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 | } | |
142 | ||
143 | static 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 | } | |
149 | ||
150 | int 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 | char *arg = argv[i]; | |
158 | char *dotdot; | |
159 | ||
160 | if (as_is) { | |
161 | show_file(arg); | |
162 | continue; | |
163 | } | |
164 | if (*arg == '-') { | |
165 | if (!strcmp(arg, "--")) { | |
166 | as_is = 1; | |
167 | /* Pass on the "--" if we show anything but files.. */ | |
168 | if (filter & (DO_FLAGS | DO_REVS)) | |
169 | show_file(arg); | |
170 | continue; | |
171 | } | |
172 | if (!strcmp(arg, "--default")) { | |
173 | def = argv[i+1]; | |
174 | i++; | |
175 | continue; | |
176 | } | |
177 | if (!strcmp(arg, "--revs-only")) { | |
178 | filter &= ~DO_NOREV; | |
179 | continue; | |
180 | } | |
181 | if (!strcmp(arg, "--no-revs")) { | |
182 | filter &= ~DO_REVS; | |
183 | continue; | |
184 | } | |
185 | if (!strcmp(arg, "--flags")) { | |
186 | filter &= ~DO_NONFLAGS; | |
187 | continue; | |
188 | } | |
189 | if (!strcmp(arg, "--no-flags")) { | |
190 | filter &= ~DO_FLAGS; | |
191 | continue; | |
192 | } | |
193 | if (!strcmp(arg, "--verify")) { | |
194 | filter &= ~(DO_FLAGS|DO_NOREV); | |
195 | verify = 1; | |
196 | continue; | |
197 | } | |
198 | if (!strcmp(arg, "--sq")) { | |
199 | output_sq = 1; | |
200 | continue; | |
201 | } | |
202 | if (!strcmp(arg, "--not")) { | |
203 | show_type ^= REVERSED; | |
204 | continue; | |
205 | } | |
206 | if (!strcmp(arg, "--symbolic")) { | |
207 | symbolic = 1; | |
208 | continue; | |
209 | } | |
210 | if (!strcmp(arg, "--all")) { | |
211 | for_each_ref(show_reference); | |
212 | continue; | |
213 | } | |
214 | if (!strcmp(arg, "--show-prefix")) { | |
215 | if (prefix) | |
216 | puts(prefix); | |
217 | continue; | |
218 | } | |
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 | } | |
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 | } | |
251 | if (verify) | |
252 | die("Needed a single revision"); | |
253 | show_flag(arg); | |
254 | continue; | |
255 | } | |
256 | ||
257 | /* Not a flag argument */ | |
258 | dotdot = strstr(arg, ".."); | |
259 | if (dotdot) { | |
260 | unsigned char end[20]; | |
261 | char *n = dotdot+2; | |
262 | *dotdot = 0; | |
263 | if (!get_sha1(arg, sha1)) { | |
264 | if (!*n) | |
265 | n = "HEAD"; | |
266 | if (!get_sha1(n, end)) { | |
267 | show_rev(NORMAL, end, n); | |
268 | show_rev(REVERSED, sha1, arg); | |
269 | continue; | |
270 | } | |
271 | } | |
272 | *dotdot = '.'; | |
273 | } | |
274 | if (!get_sha1(arg, sha1)) { | |
275 | show_rev(NORMAL, sha1, arg); | |
276 | continue; | |
277 | } | |
278 | if (*arg == '^' && !get_sha1(arg+1, sha1)) { | |
279 | show_rev(REVERSED, sha1, arg+1); | |
280 | continue; | |
281 | } | |
282 | if (verify) | |
283 | die("Needed a single revision"); | |
284 | as_is = 1; | |
285 | show_file(arg); | |
286 | } | |
287 | show_default(); | |
288 | if (verify && revs_count != 1) | |
289 | die("Needed a single revision"); | |
290 | return 0; | |
291 | } |