gitweb: safely output binary files for 'blob_plain' action
[git] / builtin-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 #include "builtin.h"
11
12 #define DO_REVS         1
13 #define DO_NOREV        2
14 #define DO_FLAGS        4
15 #define DO_NONFLAGS     8
16 static int filter = ~0;
17
18 static const char *def = NULL;
19
20 #define NORMAL 0
21 #define REVERSED 1
22 static int show_type = NORMAL;
23 static int symbolic = 0;
24 static int abbrev = 0;
25 static int output_sq = 0;
26
27 static int revs_count = 0;
28
29 /*
30  * Some arguments are relevant "revision" arguments,
31  * others are about output format or other details.
32  * This sorts it all out.
33  */
34 static int is_rev_argument(const char *arg)
35 {
36         static const char *rev_args[] = {
37                 "--all",
38                 "--bisect",
39                 "--dense",
40                 "--branches",
41                 "--header",
42                 "--max-age=",
43                 "--max-count=",
44                 "--min-age=",
45                 "--no-merges",
46                 "--objects",
47                 "--objects-edge",
48                 "--parents",
49                 "--pretty",
50                 "--remotes",
51                 "--sparse",
52                 "--tags",
53                 "--topo-order",
54                 "--date-order",
55                 "--unpacked",
56                 NULL
57         };
58         const char **p = rev_args;
59
60         /* accept -<digit>, like traditional "head" */
61         if ((*arg == '-') && isdigit(arg[1]))
62                 return 1;
63
64         for (;;) {
65                 const char *str = *p++;
66                 int len;
67                 if (!str)
68                         return 0;
69                 len = strlen(str);
70                 if (!strcmp(arg, str) ||
71                     (str[len-1] == '=' && !strncmp(arg, str, len)))
72                         return 1;
73         }
74 }
75
76 /* Output argument as a string, either SQ or normal */
77 static void show(const char *arg)
78 {
79         if (output_sq) {
80                 int sq = '\'', ch;
81
82                 putchar(sq);
83                 while ((ch = *arg++)) {
84                         if (ch == sq)
85                                 fputs("'\\'", stdout);
86                         putchar(ch);
87                 }
88                 putchar(sq);
89                 putchar(' ');
90         }
91         else
92                 puts(arg);
93 }
94
95 /* Output a revision, only if filter allows it */
96 static void show_rev(int type, const unsigned char *sha1, const char *name)
97 {
98         if (!(filter & DO_REVS))
99                 return;
100         def = NULL;
101         revs_count++;
102
103         if (type != show_type)
104                 putchar('^');
105         if (symbolic && name)
106                 show(name);
107         else if (abbrev)
108                 show(find_unique_abbrev(sha1, abbrev));
109         else
110                 show(sha1_to_hex(sha1));
111 }
112
113 /* Output a flag, only if filter allows it. */
114 static int show_flag(const char *arg)
115 {
116         if (!(filter & DO_FLAGS))
117                 return 0;
118         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
119                 show(arg);
120                 return 1;
121         }
122         return 0;
123 }
124
125 static void show_default(void)
126 {
127         const char *s = def;
128
129         if (s) {
130                 unsigned char sha1[20];
131
132                 def = NULL;
133                 if (!get_sha1(s, sha1)) {
134                         show_rev(NORMAL, sha1, s);
135                         return;
136                 }
137         }
138 }
139
140 static int show_reference(const char *refname, const unsigned char *sha1)
141 {
142         show_rev(NORMAL, sha1, refname);
143         return 0;
144 }
145
146 static void show_datestring(const char *flag, const char *datestr)
147 {
148         static char buffer[100];
149
150         /* date handling requires both flags and revs */
151         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
152                 return;
153         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
154         show(buffer);
155 }
156
157 static int show_file(const char *arg)
158 {
159         show_default();
160         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
161                 show(arg);
162                 return 1;
163         }
164         return 0;
165 }
166
167 int cmd_rev_parse(int argc, const char **argv, char **envp)
168 {
169         int i, as_is = 0, verify = 0;
170         unsigned char sha1[20];
171         const char *prefix = setup_git_directory();
172
173         git_config(git_default_config);
174
175         for (i = 1; i < argc; i++) {
176                 const char *arg = argv[i];
177                 char *dotdot;
178
179                 if (as_is) {
180                         if (show_file(arg) && as_is < 2)
181                                 verify_filename(prefix, arg);
182                         continue;
183                 }
184                 if (!strcmp(arg,"-n")) {
185                         if (++i >= argc)
186                                 die("-n requires an argument");
187                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
188                                 show(arg);
189                                 show(argv[i]);
190                         }
191                         continue;
192                 }
193                 if (!strncmp(arg,"-n",2)) {
194                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
195                                 show(arg);
196                         continue;
197                 }
198
199                 if (*arg == '-') {
200                         if (!strcmp(arg, "--")) {
201                                 as_is = 2;
202                                 /* Pass on the "--" if we show anything but files.. */
203                                 if (filter & (DO_FLAGS | DO_REVS))
204                                         show_file(arg);
205                                 continue;
206                         }
207                         if (!strcmp(arg, "--default")) {
208                                 def = argv[i+1];
209                                 i++;
210                                 continue;
211                         }
212                         if (!strcmp(arg, "--revs-only")) {
213                                 filter &= ~DO_NOREV;
214                                 continue;
215                         }
216                         if (!strcmp(arg, "--no-revs")) {
217                                 filter &= ~DO_REVS;
218                                 continue;
219                         }
220                         if (!strcmp(arg, "--flags")) {
221                                 filter &= ~DO_NONFLAGS;
222                                 continue;
223                         }
224                         if (!strcmp(arg, "--no-flags")) {
225                                 filter &= ~DO_FLAGS;
226                                 continue;
227                         }
228                         if (!strcmp(arg, "--verify")) {
229                                 filter &= ~(DO_FLAGS|DO_NOREV);
230                                 verify = 1;
231                                 continue;
232                         }
233                         if (!strcmp(arg, "--short") ||
234                             !strncmp(arg, "--short=", 8)) {
235                                 filter &= ~(DO_FLAGS|DO_NOREV);
236                                 verify = 1;
237                                 abbrev = DEFAULT_ABBREV;
238                                 if (arg[7] == '=')
239                                         abbrev = strtoul(arg + 8, NULL, 10);
240                                 if (abbrev < MINIMUM_ABBREV)
241                                         abbrev = MINIMUM_ABBREV;
242                                 else if (40 <= abbrev)
243                                         abbrev = 40;
244                                 continue;
245                         }
246                         if (!strcmp(arg, "--sq")) {
247                                 output_sq = 1;
248                                 continue;
249                         }
250                         if (!strcmp(arg, "--not")) {
251                                 show_type ^= REVERSED;
252                                 continue;
253                         }
254                         if (!strcmp(arg, "--symbolic")) {
255                                 symbolic = 1;
256                                 continue;
257                         }
258                         if (!strcmp(arg, "--all")) {
259                                 for_each_ref(show_reference);
260                                 continue;
261                         }
262                         if (!strcmp(arg, "--branches")) {
263                                 for_each_branch_ref(show_reference);
264                                 continue;
265                         }
266                         if (!strcmp(arg, "--tags")) {
267                                 for_each_tag_ref(show_reference);
268                                 continue;
269                         }
270                         if (!strcmp(arg, "--remotes")) {
271                                 for_each_remote_ref(show_reference);
272                                 continue;
273                         }
274                         if (!strcmp(arg, "--show-prefix")) {
275                                 if (prefix)
276                                         puts(prefix);
277                                 continue;
278                         }
279                         if (!strcmp(arg, "--show-cdup")) {
280                                 const char *pfx = prefix;
281                                 while (pfx) {
282                                         pfx = strchr(pfx, '/');
283                                         if (pfx) {
284                                                 pfx++;
285                                                 printf("../");
286                                         }
287                                 }
288                                 putchar('\n');
289                                 continue;
290                         }
291                         if (!strcmp(arg, "--git-dir")) {
292                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
293                                 static char cwd[PATH_MAX];
294                                 if (gitdir) {
295                                         puts(gitdir);
296                                         continue;
297                                 }
298                                 if (!prefix) {
299                                         puts(".git");
300                                         continue;
301                                 }
302                                 if (!getcwd(cwd, PATH_MAX))
303                                         die("unable to get current working directory");
304                                 printf("%s/.git\n", cwd);
305                                 continue;
306                         }
307                         if (!strncmp(arg, "--since=", 8)) {
308                                 show_datestring("--max-age=", arg+8);
309                                 continue;
310                         }
311                         if (!strncmp(arg, "--after=", 8)) {
312                                 show_datestring("--max-age=", arg+8);
313                                 continue;
314                         }
315                         if (!strncmp(arg, "--before=", 9)) {
316                                 show_datestring("--min-age=", arg+9);
317                                 continue;
318                         }
319                         if (!strncmp(arg, "--until=", 8)) {
320                                 show_datestring("--min-age=", arg+8);
321                                 continue;
322                         }
323                         if (show_flag(arg) && verify)
324                                 die("Needed a single revision");
325                         continue;
326                 }
327
328                 /* Not a flag argument */
329                 dotdot = strstr(arg, "..");
330                 if (dotdot) {
331                         unsigned char end[20];
332                         char *next = dotdot + 2;
333                         const char *this = arg;
334                         *dotdot = 0;
335                         if (!*next)
336                                 next = "HEAD";
337                         if (dotdot == arg)
338                                 this = "HEAD";
339                         if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
340                                 show_rev(NORMAL, end, next);
341                                 show_rev(REVERSED, sha1, this);
342                                 continue;
343                         }
344                         *dotdot = '.';
345                 }
346                 if (!get_sha1(arg, sha1)) {
347                         show_rev(NORMAL, sha1, arg);
348                         continue;
349                 }
350                 if (*arg == '^' && !get_sha1(arg+1, sha1)) {
351                         show_rev(REVERSED, sha1, arg+1);
352                         continue;
353                 }
354                 as_is = 1;
355                 if (!show_file(arg))
356                         continue;
357                 if (verify)
358                         die("Needed a single revision");
359                 verify_filename(prefix, arg);
360         }
361         show_default();
362         if (verify && revs_count != 1)
363                 die("Needed a single revision");
364         return 0;
365 }