21fecdf542a05e9bfa80990061ed3d0d3c849823
[git/git.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));
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