Merge branch 'jk/fetch-pack-many-refs'
[git.git] / builtin / name-rev.c
blob87d485496fd5556cbd0f24793ed7e48f11e9b292
1 #include "builtin.h"
2 #include "cache.h"
3 #include "commit.h"
4 #include "tag.h"
5 #include "refs.h"
6 #include "parse-options.h"
8 #define CUTOFF_DATE_SLOP 86400 /* one day */
10 typedef struct rev_name {
11 const char *tip_name;
12 int generation;
13 int distance;
14 } rev_name;
16 static long cutoff = LONG_MAX;
18 /* How many generations are maximally preferred over _one_ merge traversal? */
19 #define MERGE_TRAVERSAL_WEIGHT 65535
21 static void name_rev(struct commit *commit,
22 const char *tip_name, int generation, int distance,
23 int deref)
25 struct rev_name *name = (struct rev_name *)commit->util;
26 struct commit_list *parents;
27 int parent_number = 1;
29 if (!commit->object.parsed)
30 parse_commit(commit);
32 if (commit->date < cutoff)
33 return;
35 if (deref) {
36 char *new_name = xmalloc(strlen(tip_name)+3);
37 strcpy(new_name, tip_name);
38 strcat(new_name, "^0");
39 tip_name = new_name;
41 if (generation)
42 die("generation: %d, but deref?", generation);
45 if (name == NULL) {
46 name = xmalloc(sizeof(rev_name));
47 commit->util = name;
48 goto copy_data;
49 } else if (name->distance > distance) {
50 copy_data:
51 name->tip_name = tip_name;
52 name->generation = generation;
53 name->distance = distance;
54 } else
55 return;
57 for (parents = commit->parents;
58 parents;
59 parents = parents->next, parent_number++) {
60 if (parent_number > 1) {
61 int len = strlen(tip_name);
62 char *new_name = xmalloc(len +
63 1 + decimal_length(generation) + /* ~<n> */
64 1 + 2 + /* ^NN */
65 1);
67 if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
68 len -= 2;
69 if (generation > 0)
70 sprintf(new_name, "%.*s~%d^%d", len, tip_name,
71 generation, parent_number);
72 else
73 sprintf(new_name, "%.*s^%d", len, tip_name,
74 parent_number);
76 name_rev(parents->item, new_name, 0,
77 distance + MERGE_TRAVERSAL_WEIGHT, 0);
78 } else {
79 name_rev(parents->item, tip_name, generation + 1,
80 distance + 1, 0);
85 static int subpath_matches(const char *path, const char *filter)
87 const char *subpath = path;
89 while (subpath) {
90 if (!fnmatch(filter, subpath, 0))
91 return subpath - path;
92 subpath = strchr(subpath, '/');
93 if (subpath)
94 subpath++;
96 return -1;
99 struct name_ref_data {
100 int tags_only;
101 int name_only;
102 const char *ref_filter;
105 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
107 struct object *o = parse_object(sha1);
108 struct name_ref_data *data = cb_data;
109 int can_abbreviate_output = data->tags_only && data->name_only;
110 int deref = 0;
112 if (data->tags_only && prefixcmp(path, "refs/tags/"))
113 return 0;
115 if (data->ref_filter) {
116 switch (subpath_matches(path, data->ref_filter)) {
117 case -1: /* did not match */
118 return 0;
119 case 0: /* matched fully */
120 break;
121 default: /* matched subpath */
122 can_abbreviate_output = 1;
123 break;
127 while (o && o->type == OBJ_TAG) {
128 struct tag *t = (struct tag *) o;
129 if (!t->tagged)
130 break; /* broken repository */
131 o = parse_object(t->tagged->sha1);
132 deref = 1;
134 if (o && o->type == OBJ_COMMIT) {
135 struct commit *commit = (struct commit *)o;
137 if (can_abbreviate_output)
138 path = shorten_unambiguous_ref(path, 0);
139 else if (!prefixcmp(path, "refs/heads/"))
140 path = path + 11;
141 else if (!prefixcmp(path, "refs/"))
142 path = path + 5;
144 name_rev(commit, xstrdup(path), 0, 0, deref);
146 return 0;
149 /* returns a static buffer */
150 static const char *get_rev_name(const struct object *o)
152 static char buffer[1024];
153 struct rev_name *n;
154 struct commit *c;
156 if (o->type != OBJ_COMMIT)
157 return NULL;
158 c = (struct commit *) o;
159 n = c->util;
160 if (!n)
161 return NULL;
163 if (!n->generation)
164 return n->tip_name;
165 else {
166 int len = strlen(n->tip_name);
167 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
168 len -= 2;
169 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
170 n->generation);
172 return buffer;
176 static void show_name(const struct object *obj,
177 const char *caller_name,
178 int always, int allow_undefined, int name_only)
180 const char *name;
181 const unsigned char *sha1 = obj->sha1;
183 if (!name_only)
184 printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
185 name = get_rev_name(obj);
186 if (name)
187 printf("%s\n", name);
188 else if (allow_undefined)
189 printf("undefined\n");
190 else if (always)
191 printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
192 else
193 die("cannot describe '%s'", sha1_to_hex(sha1));
196 static char const * const name_rev_usage[] = {
197 N_("git name-rev [options] <commit>..."),
198 N_("git name-rev [options] --all"),
199 N_("git name-rev [options] --stdin"),
200 NULL
203 static void name_rev_line(char *p, struct name_ref_data *data)
205 int forty = 0;
206 char *p_start;
207 for (p_start = p; *p; p++) {
208 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
209 if (!ishex(*p))
210 forty = 0;
211 else if (++forty == 40 &&
212 !ishex(*(p+1))) {
213 unsigned char sha1[40];
214 const char *name = NULL;
215 char c = *(p+1);
216 int p_len = p - p_start + 1;
218 forty = 0;
220 *(p+1) = 0;
221 if (!get_sha1(p - 39, sha1)) {
222 struct object *o =
223 lookup_object(sha1);
224 if (o)
225 name = get_rev_name(o);
227 *(p+1) = c;
229 if (!name)
230 continue;
232 if (data->name_only)
233 printf("%.*s%s", p_len - 40, p_start, name);
234 else
235 printf("%.*s (%s)", p_len, p_start, name);
236 p_start = p + 1;
240 /* flush */
241 if (p_start != p)
242 fwrite(p_start, p - p_start, 1, stdout);
245 int cmd_name_rev(int argc, const char **argv, const char *prefix)
247 struct object_array revs = OBJECT_ARRAY_INIT;
248 int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
249 struct name_ref_data data = { 0, 0, NULL };
250 struct option opts[] = {
251 OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
252 OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
253 OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
254 N_("only use refs matching <pattern>")),
255 OPT_GROUP(""),
256 OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
257 OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
258 OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
259 OPT_BOOLEAN(0, "always", &always,
260 N_("show abbreviated commit object as fallback")),
261 OPT_END(),
264 git_config(git_default_config, NULL);
265 argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
266 if (!!all + !!transform_stdin + !!argc > 1) {
267 error("Specify either a list, or --all, not both!");
268 usage_with_options(name_rev_usage, opts);
270 if (all || transform_stdin)
271 cutoff = 0;
273 for (; argc; argc--, argv++) {
274 unsigned char sha1[20];
275 struct object *o;
276 struct commit *commit;
278 if (get_sha1(*argv, sha1)) {
279 fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
280 *argv);
281 continue;
284 o = deref_tag(parse_object(sha1), *argv, 0);
285 if (!o || o->type != OBJ_COMMIT) {
286 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
287 *argv);
288 continue;
291 commit = (struct commit *)o;
292 if (cutoff > commit->date)
293 cutoff = commit->date;
294 add_object_array((struct object *)commit, *argv, &revs);
297 if (cutoff)
298 cutoff = cutoff - CUTOFF_DATE_SLOP;
299 for_each_ref(name_ref, &data);
301 if (transform_stdin) {
302 char buffer[2048];
304 while (!feof(stdin)) {
305 char *p = fgets(buffer, sizeof(buffer), stdin);
306 if (!p)
307 break;
308 name_rev_line(p, &data);
310 } else if (all) {
311 int i, max;
313 max = get_max_object_index();
314 for (i = 0; i < max; i++) {
315 struct object *obj = get_indexed_object(i);
316 if (!obj || obj->type != OBJ_COMMIT)
317 continue;
318 show_name(obj, NULL,
319 always, allow_undefined, data.name_only);
321 } else {
322 int i;
323 for (i = 0; i < revs.nr; i++)
324 show_name(revs.objects[i].item, revs.objects[i].name,
325 always, allow_undefined, data.name_only);
328 return 0;