Do not expect unlink(2) to fail on a directory.
[git] / builtin-name-rev.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "commit.h"
4 #include "tag.h"
5 #include "refs.h"
6
7 #define CUTOFF_DATE_SLOP 86400 /* one day */
8
9 static const char name_rev_usage[] =
10         "git-name-rev [--tags | --refs=<pattern>] ( --all | --stdin | committish [committish...] )\n";
11
12 typedef struct rev_name {
13         const char *tip_name;
14         int merge_traversals;
15         int generation;
16 } rev_name;
17
18 static long cutoff = LONG_MAX;
19
20 static void name_rev(struct commit *commit,
21                 const char *tip_name, int merge_traversals, int generation,
22                 int deref)
23 {
24         struct rev_name *name = (struct rev_name *)commit->util;
25         struct commit_list *parents;
26         int parent_number = 1;
27
28         if (!commit->object.parsed)
29                 parse_commit(commit);
30
31         if (commit->date < cutoff)
32                 return;
33
34         if (deref) {
35                 char *new_name = xmalloc(strlen(tip_name)+3);
36                 strcpy(new_name, tip_name);
37                 strcat(new_name, "^0");
38                 tip_name = new_name;
39
40                 if (generation)
41                         die("generation: %d, but deref?", generation);
42         }
43
44         if (name == NULL) {
45                 name = xmalloc(sizeof(rev_name));
46                 commit->util = name;
47                 goto copy_data;
48         } else if (name->merge_traversals > merge_traversals ||
49                         (name->merge_traversals == merge_traversals &&
50                          name->generation > generation)) {
51 copy_data:
52                 name->tip_name = tip_name;
53                 name->merge_traversals = merge_traversals;
54                 name->generation = generation;
55         } else
56                 return;
57
58         for (parents = commit->parents;
59                         parents;
60                         parents = parents->next, parent_number++) {
61                 if (parent_number > 1) {
62                         int len = strlen(tip_name);
63                         char *new_name = xmalloc(len +
64                                 1 + decimal_length(generation) +  /* ~<n> */
65                                 1 + 2 +                           /* ^NN */
66                                 1);
67
68                         if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
69                                 len -= 2;
70                         if (generation > 0)
71                                 sprintf(new_name, "%.*s~%d^%d", len, tip_name,
72                                                 generation, parent_number);
73                         else
74                                 sprintf(new_name, "%.*s^%d", len, tip_name,
75                                                 parent_number);
76
77                         name_rev(parents->item, new_name,
78                                 merge_traversals + 1 , 0, 0);
79                 } else {
80                         name_rev(parents->item, tip_name, merge_traversals,
81                                 generation + 1, 0);
82                 }
83         }
84 }
85
86 struct name_ref_data {
87         int tags_only;
88         const char *ref_filter;
89 };
90
91 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
92 {
93         struct object *o = parse_object(sha1);
94         struct name_ref_data *data = cb_data;
95         int deref = 0;
96
97         if (data->tags_only && prefixcmp(path, "refs/tags/"))
98                 return 0;
99
100         if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
101                 return 0;
102
103         while (o && o->type == OBJ_TAG) {
104                 struct tag *t = (struct tag *) o;
105                 if (!t->tagged)
106                         break; /* broken repository */
107                 o = parse_object(t->tagged->sha1);
108                 deref = 1;
109         }
110         if (o && o->type == OBJ_COMMIT) {
111                 struct commit *commit = (struct commit *)o;
112
113                 if (!prefixcmp(path, "refs/heads/"))
114                         path = path + 11;
115                 else if (!prefixcmp(path, "refs/"))
116                         path = path + 5;
117
118                 name_rev(commit, xstrdup(path), 0, 0, deref);
119         }
120         return 0;
121 }
122
123 /* returns a static buffer */
124 static const char* get_rev_name(struct object *o)
125 {
126         static char buffer[1024];
127         struct rev_name *n;
128         struct commit *c;
129
130         if (o->type != OBJ_COMMIT)
131                 return "undefined";
132         c = (struct commit *) o;
133         n = c->util;
134         if (!n)
135                 return "undefined";
136
137         if (!n->generation)
138                 return n->tip_name;
139         else {
140                 int len = strlen(n->tip_name);
141                 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
142                         len -= 2;
143                 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
144                                 n->generation);
145
146                 return buffer;
147         }
148 }
149
150 int cmd_name_rev(int argc, const char **argv, const char *prefix)
151 {
152         struct object_array revs = { 0, 0, NULL };
153         int as_is = 0, all = 0, transform_stdin = 0;
154         struct name_ref_data data = { 0, NULL };
155
156         git_config(git_default_config);
157
158         if (argc < 2)
159                 usage(name_rev_usage);
160
161         for (--argc, ++argv; argc; --argc, ++argv) {
162                 unsigned char sha1[20];
163                 struct object *o;
164                 struct commit *commit;
165
166                 if (!as_is && (*argv)[0] == '-') {
167                         if (!strcmp(*argv, "--")) {
168                                 as_is = 1;
169                                 continue;
170                         } else if (!strcmp(*argv, "--tags")) {
171                                 data.tags_only = 1;
172                                 continue;
173                         } else  if (!prefixcmp(*argv, "--refs=")) {
174                                 data.ref_filter = *argv + 7;
175                                 continue;
176                         } else if (!strcmp(*argv, "--all")) {
177                                 if (argc > 1)
178                                         die("Specify either a list, or --all, not both!");
179                                 all = 1;
180                                 cutoff = 0;
181                                 continue;
182                         } else if (!strcmp(*argv, "--stdin")) {
183                                 if (argc > 1)
184                                         die("Specify either a list, or --stdin, not both!");
185                                 transform_stdin = 1;
186                                 cutoff = 0;
187                                 continue;
188                         }
189                         usage(name_rev_usage);
190                 }
191
192                 if (get_sha1(*argv, sha1)) {
193                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
194                                         *argv);
195                         continue;
196                 }
197
198                 o = deref_tag(parse_object(sha1), *argv, 0);
199                 if (!o || o->type != OBJ_COMMIT) {
200                         fprintf(stderr, "Could not get commit for %s. Skipping.\n",
201                                         *argv);
202                         continue;
203                 }
204
205                 commit = (struct commit *)o;
206
207                 if (cutoff > commit->date)
208                         cutoff = commit->date;
209
210                 add_object_array((struct object *)commit, *argv, &revs);
211         }
212
213         if (cutoff)
214                 cutoff = cutoff - CUTOFF_DATE_SLOP;
215         for_each_ref(name_ref, &data);
216
217         if (transform_stdin) {
218                 char buffer[2048];
219                 char *p, *p_start;
220
221                 while (!feof(stdin)) {
222                         int forty = 0;
223                         p = fgets(buffer, sizeof(buffer), stdin);
224                         if (!p)
225                                 break;
226
227                         for (p_start = p; *p; p++) {
228 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
229                                 if (!ishex(*p))
230                                         forty = 0;
231                                 else if (++forty == 40 &&
232                                                 !ishex(*(p+1))) {
233                                         unsigned char sha1[40];
234                                         const char *name = "undefined";
235                                         char c = *(p+1);
236
237                                         forty = 0;
238
239                                         *(p+1) = 0;
240                                         if (!get_sha1(p - 39, sha1)) {
241                                                 struct object *o =
242                                                         lookup_object(sha1);
243                                                 if (o)
244                                                         name = get_rev_name(o);
245                                         }
246                                         *(p+1) = c;
247
248                                         if (!strcmp(name, "undefined"))
249                                                 continue;
250
251                                         fwrite(p_start, p - p_start + 1, 1,
252                                                stdout);
253                                         printf(" (%s)", name);
254                                         p_start = p + 1;
255                                 }
256                         }
257
258                         /* flush */
259                         if (p_start != p)
260                                 fwrite(p_start, p - p_start, 1, stdout);
261                 }
262         } else if (all) {
263                 int i, max;
264
265                 max = get_max_object_index();
266                 for (i = 0; i < max; i++) {
267                         struct object * obj = get_indexed_object(i);
268                         if (!obj)
269                                 continue;
270                         printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
271                 }
272         } else {
273                 int i;
274                 for (i = 0; i < revs.nr; i++)
275                         printf("%s %s\n",
276                                 revs.objects[i].name,
277                                 get_rev_name(revs.objects[i].item));
278         }
279
280         return 0;
281 }
282