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