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 "--header",
38 "--max-age=",
39 "--max-count=",
40 "--merge-order",
41 "--min-age=",
42 "--no-merges",
43 "--objects",
44 "--parents",
45 "--pretty",
46 "--show-breaks",
47 "--topo-order",
48 "--unpacked",
49 NULL
50 };
51 const char **p = rev_args;
52 for (;;) {
54 const char *str = *p++;
55 int len;
56 if (!str)
57 return 0;
58 len = strlen(str);
59 if (!strcmp(arg, str) ||
60 (str[len-1] == '=' && !strncmp(arg, str, len)))
61 return 1;
62 }
63}
64/* Output argument as a string, either SQ or normal */
66static void show(const char *arg)
67{
68 if (output_sq) {
69 int sq = '\'', ch;
70 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/* Output a revision, only if filter allows it */
85static void show_rev(int type, const unsigned char *sha1, const char *name)
86{
87 if (!(filter & DO_REVS))
88 return;
89 def = NULL;
90 revs_count++;
91 if (type != show_type)
93 putchar('^');
94 if (symbolic && name)
95 show(name);
96 else
97 show(sha1_to_hex(sha1));
98}
99/* Output a flag, only if filter allows it. */
101static void show_flag(char *arg)
102{
103 if (!(filter & DO_FLAGS))
104 return;
105 if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV))
106 show(arg);
107}
108static void show_default(void)
110{
111 char *s = def;
112 if (s) {
114 unsigned char sha1[20];
115 def = NULL;
117 if (!get_sha1(s, sha1)) {
118 show_rev(NORMAL, sha1, s);
119 return;
120 }
121 }
122}
123static int show_reference(const char *refname, const unsigned char *sha1)
125{
126 show_rev(NORMAL, sha1, refname);
127 return 0;
128}
129static 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 /* 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 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}
153int main(int argc, char **argv)
155{
156 int i, as_is = 0, verify = 0;
157 unsigned char sha1[20];
158 const char *prefix = setup_git_directory();
159
160 for (i = 1; i < argc; i++) {
161 char *arg = argv[i];
162 char *dotdot;
163
164 if (as_is) {
165 show(arg);
166 continue;
167 }
168 if (*arg == '-') {
169 if (!strcmp(arg, "--")) {
170 as_is = 1;
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, "--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 }
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 }
252 if (verify)
253 die("Needed a single revision");
254 show_flag(arg);
255 continue;
256 }
257 /* Not a flag argument */
259 dotdot = strstr(arg, "..");
260 if (dotdot) {
261 unsigned char end[20];
262 char *n = dotdot+2;
263 *dotdot = 0;
264 if (!get_sha1(arg, sha1)) {
265 if (!*n)
266 n = "HEAD";
267 if (!get_sha1(n, end)) {
268 show_rev(NORMAL, end, n);
269 show_rev(REVERSED, sha1, arg);
270 continue;
271 }
272 }
273 *dotdot = '.';
274 }
275 if (!get_sha1(arg, sha1)) {
276 show_rev(NORMAL, sha1, arg);
277 continue;
278 }
279 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
280 show_rev(REVERSED, sha1, arg+1);
281 continue;
282 }
283 if (verify)
284 die("Needed a single revision");
285 if ((filter & (DO_NONFLAGS|DO_NOREV)) ==
286 (DO_NONFLAGS|DO_NOREV))
287 show(arg);
288 }
289 show_default();
290 if (verify && revs_count != 1)
291 die("Needed a single revision");
292 return 0;
293}