git-rev-list: make --dense the default (and introduce "--sparse")
[git/git.git] / rev-parse.c
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 "--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
53 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
65 /* Output argument as a string, either SQ or normal */
66 static 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
84 /* Output a revision, only if filter allows it */
85 static 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
92 if (type != show_type)
93 putchar('^');
94 if (symbolic && name)
95 show(name);
96 else
97 show(sha1_to_hex(sha1));
98 }
99
100 /* Output a flag, only if filter allows it. */
101 static 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 }
108
109 static void show_default(void)
110 {
111 char *s = def;
112
113 if (s) {
114 unsigned char sha1[20];
115
116 def = NULL;
117 if (!get_sha1(s, sha1)) {
118 show_rev(NORMAL, sha1, s);
119 return;
120 }
121 }
122 }
123
124 static int show_reference(const char *refname, const unsigned char *sha1)
125 {
126 show_rev(NORMAL, sha1, refname);
127 return 0;
128 }
129
130 static 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
154 static void show_file(const char *arg)
155 {
156 show_default();
157 if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV))
158 show(arg);
159 }
160
161 int main(int argc, char **argv)
162 {
163 int i, as_is = 0, verify = 0;
164 unsigned char sha1[20];
165 const char *prefix = setup_git_directory();
166
167 for (i = 1; i < argc; i++) {
168 char *arg = argv[i];
169 char *dotdot;
170
171 if (as_is) {
172 show_file(arg);
173 continue;
174 }
175 if (*arg == '-') {
176 if (!strcmp(arg, "--")) {
177 as_is = 1;
178 /* Pass on the "--" if we show anything but files.. */
179 if (filter & (DO_FLAGS | DO_REVS))
180 show_file(arg);
181 continue;
182 }
183 if (!strcmp(arg, "--default")) {
184 def = argv[i+1];
185 i++;
186 continue;
187 }
188 if (!strcmp(arg, "--revs-only")) {
189 filter &= ~DO_NOREV;
190 continue;
191 }
192 if (!strcmp(arg, "--no-revs")) {
193 filter &= ~DO_REVS;
194 continue;
195 }
196 if (!strcmp(arg, "--flags")) {
197 filter &= ~DO_NONFLAGS;
198 continue;
199 }
200 if (!strcmp(arg, "--no-flags")) {
201 filter &= ~DO_FLAGS;
202 continue;
203 }
204 if (!strcmp(arg, "--verify")) {
205 filter &= ~(DO_FLAGS|DO_NOREV);
206 verify = 1;
207 continue;
208 }
209 if (!strcmp(arg, "--sq")) {
210 output_sq = 1;
211 continue;
212 }
213 if (!strcmp(arg, "--not")) {
214 show_type ^= REVERSED;
215 continue;
216 }
217 if (!strcmp(arg, "--symbolic")) {
218 symbolic = 1;
219 continue;
220 }
221 if (!strcmp(arg, "--all")) {
222 for_each_ref(show_reference);
223 continue;
224 }
225 if (!strcmp(arg, "--show-prefix")) {
226 if (prefix)
227 puts(prefix);
228 continue;
229 }
230 if (!strcmp(arg, "--git-dir")) {
231 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
232 static char cwd[PATH_MAX];
233 if (gitdir) {
234 puts(gitdir);
235 continue;
236 }
237 if (!prefix) {
238 puts(".git");
239 continue;
240 }
241 if (!getcwd(cwd, PATH_MAX))
242 die("unable to get current working directory");
243 printf("%s/.git\n", cwd);
244 continue;
245 }
246 if (!strncmp(arg, "--since=", 8)) {
247 show_datestring("--max-age=", arg+8);
248 continue;
249 }
250 if (!strncmp(arg, "--after=", 8)) {
251 show_datestring("--max-age=", arg+8);
252 continue;
253 }
254 if (!strncmp(arg, "--before=", 9)) {
255 show_datestring("--min-age=", arg+9);
256 continue;
257 }
258 if (!strncmp(arg, "--until=", 8)) {
259 show_datestring("--min-age=", arg+8);
260 continue;
261 }
262 if (verify)
263 die("Needed a single revision");
264 show_flag(arg);
265 continue;
266 }
267
268 /* Not a flag argument */
269 dotdot = strstr(arg, "..");
270 if (dotdot) {
271 unsigned char end[20];
272 char *n = dotdot+2;
273 *dotdot = 0;
274 if (!get_sha1(arg, sha1)) {
275 if (!*n)
276 n = "HEAD";
277 if (!get_sha1(n, end)) {
278 show_rev(NORMAL, end, n);
279 show_rev(REVERSED, sha1, arg);
280 continue;
281 }
282 }
283 *dotdot = '.';
284 }
285 if (!get_sha1(arg, sha1)) {
286 show_rev(NORMAL, sha1, arg);
287 continue;
288 }
289 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
290 show_rev(REVERSED, sha1, arg+1);
291 continue;
292 }
293 if (verify)
294 die("Needed a single revision");
295 show_file(arg);
296 }
297 show_default();
298 if (verify && revs_count != 1)
299 die("Needed a single revision");
300 return 0;
301 }