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