object: convert parse_object* to take struct 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 unsigned long taggerdate;
14 int generation;
15 int distance;
16 } rev_name;
17
18 static long cutoff = LONG_MAX;
19
20 /* How many generations are maximally preferred over _one_ merge traversal? */
21 #define MERGE_TRAVERSAL_WEIGHT 65535
22
23 static void name_rev(struct commit *commit,
24 const char *tip_name, unsigned long taggerdate,
25 int generation, int distance,
26 int deref)
27 {
28 struct rev_name *name = (struct rev_name *)commit->util;
29 struct commit_list *parents;
30 int parent_number = 1;
31
32 parse_commit(commit);
33
34 if (commit->date < cutoff)
35 return;
36
37 if (deref) {
38 tip_name = xstrfmt("%s^0", tip_name);
39
40 if (generation)
41 die("generation: %d, but deref?", generation);
42 }
43
44 if (name == NULL) {
45 name = xmalloc(sizeof(rev_name));
46 commit->util = name;
47 goto copy_data;
48 } else if (name->taggerdate > taggerdate ||
49 (name->taggerdate == taggerdate &&
50 name->distance > distance)) {
51 copy_data:
52 name->tip_name = tip_name;
53 name->taggerdate = taggerdate;
54 name->generation = generation;
55 name->distance = distance;
56 } else
57 return;
58
59 for (parents = commit->parents;
60 parents;
61 parents = parents->next, parent_number++) {
62 if (parent_number > 1) {
63 size_t len;
64 char *new_name;
65
66 strip_suffix(tip_name, "^0", &len);
67 if (generation > 0)
68 new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
69 generation, parent_number);
70 else
71 new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
72 parent_number);
73
74 name_rev(parents->item, new_name, taggerdate, 0,
75 distance + MERGE_TRAVERSAL_WEIGHT, 0);
76 } else {
77 name_rev(parents->item, tip_name, taggerdate,
78 generation + 1, distance + 1, 0);
79 }
80 }
81 }
82
83 static int subpath_matches(const char *path, const char *filter)
84 {
85 const char *subpath = path;
86
87 while (subpath) {
88 if (!wildmatch(filter, subpath, 0, NULL))
89 return subpath - path;
90 subpath = strchr(subpath, '/');
91 if (subpath)
92 subpath++;
93 }
94 return -1;
95 }
96
97 static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
98 {
99 if (shorten_unambiguous)
100 refname = shorten_unambiguous_ref(refname, 0);
101 else if (starts_with(refname, "refs/heads/"))
102 refname = refname + 11;
103 else if (starts_with(refname, "refs/"))
104 refname = refname + 5;
105 return refname;
106 }
107
108 struct name_ref_data {
109 int tags_only;
110 int name_only;
111 struct string_list ref_filters;
112 struct string_list exclude_filters;
113 };
114
115 static struct tip_table {
116 struct tip_table_entry {
117 struct object_id oid;
118 const char *refname;
119 } *table;
120 int nr;
121 int alloc;
122 int sorted;
123 } tip_table;
124
125 static void add_to_tip_table(const struct object_id *oid, const char *refname,
126 int shorten_unambiguous)
127 {
128 refname = name_ref_abbrev(refname, shorten_unambiguous);
129
130 ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
131 oidcpy(&tip_table.table[tip_table.nr].oid, oid);
132 tip_table.table[tip_table.nr].refname = xstrdup(refname);
133 tip_table.nr++;
134 tip_table.sorted = 0;
135 }
136
137 static int tipcmp(const void *a_, const void *b_)
138 {
139 const struct tip_table_entry *a = a_, *b = b_;
140 return oidcmp(&a->oid, &b->oid);
141 }
142
143 static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
144 {
145 struct object *o = parse_object(oid);
146 struct name_ref_data *data = cb_data;
147 int can_abbreviate_output = data->tags_only && data->name_only;
148 int deref = 0;
149 unsigned long taggerdate = ULONG_MAX;
150
151 if (data->tags_only && !starts_with(path, "refs/tags/"))
152 return 0;
153
154 if (data->exclude_filters.nr) {
155 struct string_list_item *item;
156
157 for_each_string_list_item(item, &data->exclude_filters) {
158 if (subpath_matches(path, item->string) >= 0)
159 return 0;
160 }
161 }
162
163 if (data->ref_filters.nr) {
164 struct string_list_item *item;
165 int matched = 0;
166
167 /* See if any of the patterns match. */
168 for_each_string_list_item(item, &data->ref_filters) {
169 /*
170 * Check all patterns even after finding a match, so
171 * that we can see if a match with a subpath exists.
172 * When a user asked for 'refs/tags/v*' and 'v1.*',
173 * both of which match, the user is showing her
174 * willingness to accept a shortened output by having
175 * the 'v1.*' in the acceptable refnames, so we
176 * shouldn't stop when seeing 'refs/tags/v1.4' matches
177 * 'refs/tags/v*'. We should show it as 'v1.4'.
178 */
179 switch (subpath_matches(path, item->string)) {
180 case -1: /* did not match */
181 break;
182 case 0: /* matched fully */
183 matched = 1;
184 break;
185 default: /* matched subpath */
186 matched = 1;
187 can_abbreviate_output = 1;
188 break;
189 }
190 }
191
192 /* If none of the patterns matched, stop now */
193 if (!matched)
194 return 0;
195 }
196
197 add_to_tip_table(oid, path, can_abbreviate_output);
198
199 while (o && o->type == OBJ_TAG) {
200 struct tag *t = (struct tag *) o;
201 if (!t->tagged)
202 break; /* broken repository */
203 o = parse_object(&t->tagged->oid);
204 deref = 1;
205 taggerdate = t->date;
206 }
207 if (o && o->type == OBJ_COMMIT) {
208 struct commit *commit = (struct commit *)o;
209
210 path = name_ref_abbrev(path, can_abbreviate_output);
211 name_rev(commit, xstrdup(path), taggerdate, 0, 0, deref);
212 }
213 return 0;
214 }
215
216 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
217 {
218 struct tip_table_entry *table = table_;
219 return table[ix].oid.hash;
220 }
221
222 static const char *get_exact_ref_match(const struct object *o)
223 {
224 int found;
225
226 if (!tip_table.table || !tip_table.nr)
227 return NULL;
228
229 if (!tip_table.sorted) {
230 QSORT(tip_table.table, tip_table.nr, tipcmp);
231 tip_table.sorted = 1;
232 }
233
234 found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr,
235 nth_tip_table_ent);
236 if (0 <= found)
237 return tip_table.table[found].refname;
238 return NULL;
239 }
240
241 /* may return a constant string or use "buf" as scratch space */
242 static const char *get_rev_name(const struct object *o, struct strbuf *buf)
243 {
244 struct rev_name *n;
245 struct commit *c;
246
247 if (o->type != OBJ_COMMIT)
248 return get_exact_ref_match(o);
249 c = (struct commit *) o;
250 n = c->util;
251 if (!n)
252 return NULL;
253
254 if (!n->generation)
255 return n->tip_name;
256 else {
257 int len = strlen(n->tip_name);
258 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
259 len -= 2;
260 strbuf_reset(buf);
261 strbuf_addf(buf, "%.*s~%d", len, n->tip_name, n->generation);
262 return buf->buf;
263 }
264 }
265
266 static void show_name(const struct object *obj,
267 const char *caller_name,
268 int always, int allow_undefined, int name_only)
269 {
270 const char *name;
271 const struct object_id *oid = &obj->oid;
272 struct strbuf buf = STRBUF_INIT;
273
274 if (!name_only)
275 printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
276 name = get_rev_name(obj, &buf);
277 if (name)
278 printf("%s\n", name);
279 else if (allow_undefined)
280 printf("undefined\n");
281 else if (always)
282 printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
283 else
284 die("cannot describe '%s'", oid_to_hex(oid));
285 strbuf_release(&buf);
286 }
287
288 static char const * const name_rev_usage[] = {
289 N_("git name-rev [<options>] <commit>..."),
290 N_("git name-rev [<options>] --all"),
291 N_("git name-rev [<options>] --stdin"),
292 NULL
293 };
294
295 static void name_rev_line(char *p, struct name_ref_data *data)
296 {
297 struct strbuf buf = STRBUF_INIT;
298 int forty = 0;
299 char *p_start;
300 for (p_start = p; *p; p++) {
301 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
302 if (!ishex(*p))
303 forty = 0;
304 else if (++forty == GIT_SHA1_HEXSZ &&
305 !ishex(*(p+1))) {
306 struct object_id oid;
307 const char *name = NULL;
308 char c = *(p+1);
309 int p_len = p - p_start + 1;
310
311 forty = 0;
312
313 *(p+1) = 0;
314 if (!get_oid(p - (GIT_SHA1_HEXSZ - 1), &oid)) {
315 struct object *o =
316 lookup_object(oid.hash);
317 if (o)
318 name = get_rev_name(o, &buf);
319 }
320 *(p+1) = c;
321
322 if (!name)
323 continue;
324
325 if (data->name_only)
326 printf("%.*s%s", p_len - GIT_SHA1_HEXSZ, p_start, name);
327 else
328 printf("%.*s (%s)", p_len, p_start, name);
329 p_start = p + 1;
330 }
331 }
332
333 /* flush */
334 if (p_start != p)
335 fwrite(p_start, p - p_start, 1, stdout);
336
337 strbuf_release(&buf);
338 }
339
340 int cmd_name_rev(int argc, const char **argv, const char *prefix)
341 {
342 struct object_array revs = OBJECT_ARRAY_INIT;
343 int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
344 struct name_ref_data data = { 0, 0, STRING_LIST_INIT_NODUP, STRING_LIST_INIT_NODUP };
345 struct option opts[] = {
346 OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
347 OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
348 OPT_STRING_LIST(0, "refs", &data.ref_filters, N_("pattern"),
349 N_("only use refs matching <pattern>")),
350 OPT_STRING_LIST(0, "exclude", &data.exclude_filters, N_("pattern"),
351 N_("ignore refs matching <pattern>")),
352 OPT_GROUP(""),
353 OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
354 OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
355 OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
356 OPT_BOOL(0, "always", &always,
357 N_("show abbreviated commit object as fallback")),
358 {
359 /* A Hidden OPT_BOOL */
360 OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
361 N_("dereference tags in the input (internal use)"),
362 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
363 },
364 OPT_END(),
365 };
366
367 git_config(git_default_config, NULL);
368 argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
369 if (all + transform_stdin + !!argc > 1) {
370 error("Specify either a list, or --all, not both!");
371 usage_with_options(name_rev_usage, opts);
372 }
373 if (all || transform_stdin)
374 cutoff = 0;
375
376 for (; argc; argc--, argv++) {
377 struct object_id oid;
378 struct object *object;
379 struct commit *commit;
380
381 if (get_oid(*argv, &oid)) {
382 fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
383 *argv);
384 continue;
385 }
386
387 commit = NULL;
388 object = parse_object(&oid);
389 if (object) {
390 struct object *peeled = deref_tag(object, *argv, 0);
391 if (peeled && peeled->type == OBJ_COMMIT)
392 commit = (struct commit *)peeled;
393 }
394
395 if (!object) {
396 fprintf(stderr, "Could not get object for %s. Skipping.\n",
397 *argv);
398 continue;
399 }
400
401 if (commit) {
402 if (cutoff > commit->date)
403 cutoff = commit->date;
404 }
405
406 if (peel_tag) {
407 if (!commit) {
408 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
409 *argv);
410 continue;
411 }
412 object = (struct object *)commit;
413 }
414 add_object_array(object, *argv, &revs);
415 }
416
417 if (cutoff)
418 cutoff = cutoff - CUTOFF_DATE_SLOP;
419 for_each_ref(name_ref, &data);
420
421 if (transform_stdin) {
422 char buffer[2048];
423
424 while (!feof(stdin)) {
425 char *p = fgets(buffer, sizeof(buffer), stdin);
426 if (!p)
427 break;
428 name_rev_line(p, &data);
429 }
430 } else if (all) {
431 int i, max;
432
433 max = get_max_object_index();
434 for (i = 0; i < max; i++) {
435 struct object *obj = get_indexed_object(i);
436 if (!obj || obj->type != OBJ_COMMIT)
437 continue;
438 show_name(obj, NULL,
439 always, allow_undefined, data.name_only);
440 }
441 } else {
442 int i;
443 for (i = 0; i < revs.nr; i++)
444 show_name(revs.objects[i].item, revs.objects[i].name,
445 always, allow_undefined, data.name_only);
446 }
447
448 return 0;
449 }