Merge branch 'rs/archive'
[git/builtin-gsoc.git] / builtin-name-rev.c
blob03083e94776234b280316978cd3f638262f41398
1 #include "builtin.h"
2 #include "cache.h"
3 #include "commit.h"
4 #include "tag.h"
5 #include "refs.h"
7 #define CUTOFF_DATE_SLOP 86400 /* one day */
9 static const char name_rev_usage[] =
10 "git-name-rev [--tags | --refs=<pattern>] ( --all | --stdin | committish [committish...] )\n";
12 typedef struct rev_name {
13 const char *tip_name;
14 int generation;
15 int distance;
16 } rev_name;
18 static long cutoff = LONG_MAX;
20 /* How many generations are maximally preferred over _one_ merge traversal? */
21 #define MERGE_TRAVERSAL_WEIGHT 65535
23 static void name_rev(struct commit *commit,
24 const char *tip_name, int generation, int distance,
25 int deref)
27 struct rev_name *name = (struct rev_name *)commit->util;
28 struct commit_list *parents;
29 int parent_number = 1;
31 if (!commit->object.parsed)
32 parse_commit(commit);
34 if (commit->date < cutoff)
35 return;
37 if (deref) {
38 char *new_name = xmalloc(strlen(tip_name)+3);
39 strcpy(new_name, tip_name);
40 strcat(new_name, "^0");
41 tip_name = new_name;
43 if (generation)
44 die("generation: %d, but deref?", generation);
47 if (name == NULL) {
48 name = xmalloc(sizeof(rev_name));
49 commit->util = name;
50 goto copy_data;
51 } else if (name->distance > distance) {
52 copy_data:
53 name->tip_name = tip_name;
54 name->generation = generation;
55 name->distance = distance;
56 } else
57 return;
59 for (parents = commit->parents;
60 parents;
61 parents = parents->next, parent_number++) {
62 if (parent_number > 1) {
63 int len = strlen(tip_name);
64 char *new_name = xmalloc(len +
65 1 + decimal_length(generation) + /* ~<n> */
66 1 + 2 + /* ^NN */
67 1);
69 if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
70 len -= 2;
71 if (generation > 0)
72 sprintf(new_name, "%.*s~%d^%d", len, tip_name,
73 generation, parent_number);
74 else
75 sprintf(new_name, "%.*s^%d", len, tip_name,
76 parent_number);
78 name_rev(parents->item, new_name, 0,
79 distance + MERGE_TRAVERSAL_WEIGHT, 0);
80 } else {
81 name_rev(parents->item, tip_name, generation + 1,
82 distance + 1, 0);
87 struct name_ref_data {
88 int tags_only;
89 int name_only;
90 const char *ref_filter;
93 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
95 struct object *o = parse_object(sha1);
96 struct name_ref_data *data = cb_data;
97 int deref = 0;
99 if (data->tags_only && prefixcmp(path, "refs/tags/"))
100 return 0;
102 if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
103 return 0;
105 while (o && o->type == OBJ_TAG) {
106 struct tag *t = (struct tag *) o;
107 if (!t->tagged)
108 break; /* broken repository */
109 o = parse_object(t->tagged->sha1);
110 deref = 1;
112 if (o && o->type == OBJ_COMMIT) {
113 struct commit *commit = (struct commit *)o;
115 if (!prefixcmp(path, "refs/heads/"))
116 path = path + 11;
117 else if (data->tags_only
118 && data->name_only
119 && !prefixcmp(path, "refs/tags/"))
120 path = path + 10;
121 else if (!prefixcmp(path, "refs/"))
122 path = path + 5;
124 name_rev(commit, xstrdup(path), 0, 0, deref);
126 return 0;
129 /* returns a static buffer */
130 static const char* get_rev_name(struct object *o)
132 static char buffer[1024];
133 struct rev_name *n;
134 struct commit *c;
136 if (o->type != OBJ_COMMIT)
137 return "undefined";
138 c = (struct commit *) o;
139 n = c->util;
140 if (!n)
141 return "undefined";
143 if (!n->generation)
144 return n->tip_name;
145 else {
146 int len = strlen(n->tip_name);
147 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
148 len -= 2;
149 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
150 n->generation);
152 return buffer;
156 int cmd_name_rev(int argc, const char **argv, const char *prefix)
158 struct object_array revs = { 0, 0, NULL };
159 int as_is = 0, all = 0, transform_stdin = 0;
160 struct name_ref_data data = { 0, 0, NULL };
162 git_config(git_default_config);
164 if (argc < 2)
165 usage(name_rev_usage);
167 for (--argc, ++argv; argc; --argc, ++argv) {
168 unsigned char sha1[20];
169 struct object *o;
170 struct commit *commit;
172 if (!as_is && (*argv)[0] == '-') {
173 if (!strcmp(*argv, "--")) {
174 as_is = 1;
175 continue;
176 } else if (!strcmp(*argv, "--name-only")) {
177 data.name_only = 1;
178 continue;
179 } else if (!strcmp(*argv, "--tags")) {
180 data.tags_only = 1;
181 continue;
182 } else if (!prefixcmp(*argv, "--refs=")) {
183 data.ref_filter = *argv + 7;
184 continue;
185 } else if (!strcmp(*argv, "--all")) {
186 if (argc > 1)
187 die("Specify either a list, or --all, not both!");
188 all = 1;
189 cutoff = 0;
190 continue;
191 } else if (!strcmp(*argv, "--stdin")) {
192 if (argc > 1)
193 die("Specify either a list, or --stdin, not both!");
194 transform_stdin = 1;
195 cutoff = 0;
196 continue;
198 usage(name_rev_usage);
201 if (get_sha1(*argv, sha1)) {
202 fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
203 *argv);
204 continue;
207 o = deref_tag(parse_object(sha1), *argv, 0);
208 if (!o || o->type != OBJ_COMMIT) {
209 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
210 *argv);
211 continue;
214 commit = (struct commit *)o;
216 if (cutoff > commit->date)
217 cutoff = commit->date;
219 add_object_array((struct object *)commit, *argv, &revs);
222 if (cutoff)
223 cutoff = cutoff - CUTOFF_DATE_SLOP;
224 for_each_ref(name_ref, &data);
226 if (transform_stdin) {
227 char buffer[2048];
228 char *p, *p_start;
230 while (!feof(stdin)) {
231 int forty = 0;
232 p = fgets(buffer, sizeof(buffer), stdin);
233 if (!p)
234 break;
236 for (p_start = p; *p; p++) {
237 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
238 if (!ishex(*p))
239 forty = 0;
240 else if (++forty == 40 &&
241 !ishex(*(p+1))) {
242 unsigned char sha1[40];
243 const char *name = "undefined";
244 char c = *(p+1);
246 forty = 0;
248 *(p+1) = 0;
249 if (!get_sha1(p - 39, sha1)) {
250 struct object *o =
251 lookup_object(sha1);
252 if (o)
253 name = get_rev_name(o);
255 *(p+1) = c;
257 if (!strcmp(name, "undefined"))
258 continue;
260 fwrite(p_start, p - p_start + 1, 1,
261 stdout);
262 printf(" (%s)", name);
263 p_start = p + 1;
267 /* flush */
268 if (p_start != p)
269 fwrite(p_start, p - p_start, 1, stdout);
271 } else if (all) {
272 int i, max;
274 max = get_max_object_index();
275 for (i = 0; i < max; i++) {
276 struct object * obj = get_indexed_object(i);
277 if (!obj)
278 continue;
279 if (!data.name_only)
280 printf("%s ", sha1_to_hex(obj->sha1));
281 printf("%s\n", get_rev_name(obj));
283 } else {
284 int i;
285 for (i = 0; i < revs.nr; i++) {
286 if (!data.name_only)
287 printf("%s ", revs.objects[i].name);
288 printf("%s\n", get_rev_name(revs.objects[i].item));
292 return 0;