Convert struct object to object_id
[git/git.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 #include "parse-options.h"
7 #include "sha1-lookup.h"
8
9 #define CUTOFF_DATE_SLOP 86400 /* one day */
10
11 typedef struct rev_name {
12 const char *tip_name;
13 int generation;
14 int distance;
15 } rev_name;
16
17 static long cutoff = LONG_MAX;
18
19 /* How many generations are maximally preferred over _one_ merge traversal? */
20 #define MERGE_TRAVERSAL_WEIGHT 65535
21
22 static void name_rev(struct commit *commit,
23 const char *tip_name, int generation, int distance,
24 int deref)
25 {
26 struct rev_name *name = (struct rev_name *)commit->util;
27 struct commit_list *parents;
28 int parent_number = 1;
29
30 parse_commit(commit);
31
32 if (commit->date < cutoff)
33 return;
34
35 if (deref) {
36 tip_name = xstrfmt("%s^0", tip_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->distance > distance) {
47 copy_data:
48 name->tip_name = tip_name;
49 name->generation = generation;
50 name->distance = distance;
51 } else
52 return;
53
54 for (parents = commit->parents;
55 parents;
56 parents = parents->next, parent_number++) {
57 if (parent_number > 1) {
58 size_t len;
59 char *new_name;
60
61 strip_suffix(tip_name, "^0", &len);
62 if (generation > 0)
63 new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
64 generation, parent_number);
65 else
66 new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
67 parent_number);
68
69 name_rev(parents->item, new_name, 0,
70 distance + MERGE_TRAVERSAL_WEIGHT, 0);
71 } else {
72 name_rev(parents->item, tip_name, generation + 1,
73 distance + 1, 0);
74 }
75 }
76 }
77
78 static int subpath_matches(const char *path, const char *filter)
79 {
80 const char *subpath = path;
81
82 while (subpath) {
83 if (!wildmatch(filter, subpath, 0, NULL))
84 return subpath - path;
85 subpath = strchr(subpath, '/');
86 if (subpath)
87 subpath++;
88 }
89 return -1;
90 }
91
92 static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
93 {
94 if (shorten_unambiguous)
95 refname = shorten_unambiguous_ref(refname, 0);
96 else if (starts_with(refname, "refs/heads/"))
97 refname = refname + 11;
98 else if (starts_with(refname, "refs/"))
99 refname = refname + 5;
100 return refname;
101 }
102
103 struct name_ref_data {
104 int tags_only;
105 int name_only;
106 const char *ref_filter;
107 };
108
109 static struct tip_table {
110 struct tip_table_entry {
111 unsigned char sha1[20];
112 const char *refname;
113 } *table;
114 int nr;
115 int alloc;
116 int sorted;
117 } tip_table;
118
119 static void add_to_tip_table(const unsigned char *sha1, const char *refname,
120 int shorten_unambiguous)
121 {
122 refname = name_ref_abbrev(refname, shorten_unambiguous);
123
124 ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
125 hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
126 tip_table.table[tip_table.nr].refname = xstrdup(refname);
127 tip_table.nr++;
128 tip_table.sorted = 0;
129 }
130
131 static int tipcmp(const void *a_, const void *b_)
132 {
133 const struct tip_table_entry *a = a_, *b = b_;
134 return hashcmp(a->sha1, b->sha1);
135 }
136
137 static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
138 {
139 struct object *o = parse_object(oid->hash);
140 struct name_ref_data *data = cb_data;
141 int can_abbreviate_output = data->tags_only && data->name_only;
142 int deref = 0;
143
144 if (data->tags_only && !starts_with(path, "refs/tags/"))
145 return 0;
146
147 if (data->ref_filter) {
148 switch (subpath_matches(path, data->ref_filter)) {
149 case -1: /* did not match */
150 return 0;
151 case 0: /* matched fully */
152 break;
153 default: /* matched subpath */
154 can_abbreviate_output = 1;
155 break;
156 }
157 }
158
159 add_to_tip_table(oid->hash, path, can_abbreviate_output);
160
161 while (o && o->type == OBJ_TAG) {
162 struct tag *t = (struct tag *) o;
163 if (!t->tagged)
164 break; /* broken repository */
165 o = parse_object(get_object_hash(*t->tagged));
166 deref = 1;
167 }
168 if (o && o->type == OBJ_COMMIT) {
169 struct commit *commit = (struct commit *)o;
170
171 path = name_ref_abbrev(path, can_abbreviate_output);
172 name_rev(commit, xstrdup(path), 0, 0, deref);
173 }
174 return 0;
175 }
176
177 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
178 {
179 struct tip_table_entry *table = table_;
180 return table[ix].sha1;
181 }
182
183 static const char *get_exact_ref_match(const struct object *o)
184 {
185 int found;
186
187 if (!tip_table.table || !tip_table.nr)
188 return NULL;
189
190 if (!tip_table.sorted) {
191 qsort(tip_table.table, tip_table.nr, sizeof(*tip_table.table),
192 tipcmp);
193 tip_table.sorted = 1;
194 }
195
196 found = sha1_pos(get_object_hash(*o), tip_table.table, tip_table.nr,
197 nth_tip_table_ent);
198 if (0 <= found)
199 return tip_table.table[found].refname;
200 return NULL;
201 }
202
203 /* returns a static buffer */
204 static const char *get_rev_name(const struct object *o)
205 {
206 static char buffer[1024];
207 struct rev_name *n;
208 struct commit *c;
209
210 if (o->type != OBJ_COMMIT)
211 return get_exact_ref_match(o);
212 c = (struct commit *) o;
213 n = c->util;
214 if (!n)
215 return NULL;
216
217 if (!n->generation)
218 return n->tip_name;
219 else {
220 int len = strlen(n->tip_name);
221 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
222 len -= 2;
223 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
224 n->generation);
225
226 return buffer;
227 }
228 }
229
230 static void show_name(const struct object *obj,
231 const char *caller_name,
232 int always, int allow_undefined, int name_only)
233 {
234 const char *name;
235 const struct object_id *oid = &obj->oid;
236
237 if (!name_only)
238 printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
239 name = get_rev_name(obj);
240 if (name)
241 printf("%s\n", name);
242 else if (allow_undefined)
243 printf("undefined\n");
244 else if (always)
245 printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
246 else
247 die("cannot describe '%s'", oid_to_hex(oid));
248 }
249
250 static char const * const name_rev_usage[] = {
251 N_("git name-rev [<options>] <commit>..."),
252 N_("git name-rev [<options>] --all"),
253 N_("git name-rev [<options>] --stdin"),
254 NULL
255 };
256
257 static void name_rev_line(char *p, struct name_ref_data *data)
258 {
259 int forty = 0;
260 char *p_start;
261 for (p_start = p; *p; p++) {
262 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
263 if (!ishex(*p))
264 forty = 0;
265 else if (++forty == 40 &&
266 !ishex(*(p+1))) {
267 unsigned char sha1[40];
268 const char *name = NULL;
269 char c = *(p+1);
270 int p_len = p - p_start + 1;
271
272 forty = 0;
273
274 *(p+1) = 0;
275 if (!get_sha1(p - 39, sha1)) {
276 struct object *o =
277 lookup_object(sha1);
278 if (o)
279 name = get_rev_name(o);
280 }
281 *(p+1) = c;
282
283 if (!name)
284 continue;
285
286 if (data->name_only)
287 printf("%.*s%s", p_len - 40, p_start, name);
288 else
289 printf("%.*s (%s)", p_len, p_start, name);
290 p_start = p + 1;
291 }
292 }
293
294 /* flush */
295 if (p_start != p)
296 fwrite(p_start, p - p_start, 1, stdout);
297 }
298
299 int cmd_name_rev(int argc, const char **argv, const char *prefix)
300 {
301 struct object_array revs = OBJECT_ARRAY_INIT;
302 int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
303 struct name_ref_data data = { 0, 0, NULL };
304 struct option opts[] = {
305 OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
306 OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
307 OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
308 N_("only use refs matching <pattern>")),
309 OPT_GROUP(""),
310 OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
311 OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
312 OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
313 OPT_BOOL(0, "always", &always,
314 N_("show abbreviated commit object as fallback")),
315 {
316 /* A Hidden OPT_BOOL */
317 OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
318 N_("dereference tags in the input (internal use)"),
319 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
320 },
321 OPT_END(),
322 };
323
324 git_config(git_default_config, NULL);
325 argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
326 if (all + transform_stdin + !!argc > 1) {
327 error("Specify either a list, or --all, not both!");
328 usage_with_options(name_rev_usage, opts);
329 }
330 if (all || transform_stdin)
331 cutoff = 0;
332
333 for (; argc; argc--, argv++) {
334 unsigned char sha1[20];
335 struct object *object;
336 struct commit *commit;
337
338 if (get_sha1(*argv, sha1)) {
339 fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
340 *argv);
341 continue;
342 }
343
344 commit = NULL;
345 object = parse_object(sha1);
346 if (object) {
347 struct object *peeled = deref_tag(object, *argv, 0);
348 if (peeled && peeled->type == OBJ_COMMIT)
349 commit = (struct commit *)peeled;
350 }
351
352 if (!object) {
353 fprintf(stderr, "Could not get object for %s. Skipping.\n",
354 *argv);
355 continue;
356 }
357
358 if (commit) {
359 if (cutoff > commit->date)
360 cutoff = commit->date;
361 }
362
363 if (peel_tag) {
364 if (!commit) {
365 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
366 *argv);
367 continue;
368 }
369 object = (struct object *)commit;
370 }
371 add_object_array(object, *argv, &revs);
372 }
373
374 if (cutoff)
375 cutoff = cutoff - CUTOFF_DATE_SLOP;
376 for_each_ref(name_ref, &data);
377
378 if (transform_stdin) {
379 char buffer[2048];
380
381 while (!feof(stdin)) {
382 char *p = fgets(buffer, sizeof(buffer), stdin);
383 if (!p)
384 break;
385 name_rev_line(p, &data);
386 }
387 } else if (all) {
388 int i, max;
389
390 max = get_max_object_index();
391 for (i = 0; i < max; i++) {
392 struct object *obj = get_indexed_object(i);
393 if (!obj || obj->type != OBJ_COMMIT)
394 continue;
395 show_name(obj, NULL,
396 always, allow_undefined, data.name_only);
397 }
398 } else {
399 int i;
400 for (i = 0; i < revs.nr; i++)
401 show_name(revs.objects[i].item, revs.objects[i].name,
402 always, allow_undefined, data.name_only);
403 }
404
405 return 0;
406 }