t8001/t8002: blame: add tests of -L line numbers less than 1
[git.git] / builtin / name-rev.c
blob0aaa19e4abeb462b2f1d05d5e03aa29bee810db8
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"
9 #define CUTOFF_DATE_SLOP 86400 /* one day */
11 typedef struct rev_name {
12 const char *tip_name;
13 int generation;
14 int distance;
15 } rev_name;
17 static long cutoff = LONG_MAX;
19 /* How many generations are maximally preferred over _one_ merge traversal? */
20 #define MERGE_TRAVERSAL_WEIGHT 65535
22 static void name_rev(struct commit *commit,
23 const char *tip_name, int generation, int distance,
24 int deref)
26 struct rev_name *name = (struct rev_name *)commit->util;
27 struct commit_list *parents;
28 int parent_number = 1;
30 if (!commit->object.parsed)
31 parse_commit(commit);
33 if (commit->date < cutoff)
34 return;
36 if (deref) {
37 char *new_name = xmalloc(strlen(tip_name)+3);
38 strcpy(new_name, tip_name);
39 strcat(new_name, "^0");
40 tip_name = new_name;
42 if (generation)
43 die("generation: %d, but deref?", generation);
46 if (name == NULL) {
47 name = xmalloc(sizeof(rev_name));
48 commit->util = name;
49 goto copy_data;
50 } else if (name->distance > distance) {
51 copy_data:
52 name->tip_name = tip_name;
53 name->generation = generation;
54 name->distance = distance;
55 } else
56 return;
58 for (parents = commit->parents;
59 parents;
60 parents = parents->next, parent_number++) {
61 if (parent_number > 1) {
62 int len = strlen(tip_name);
63 char *new_name = xmalloc(len +
64 1 + decimal_length(generation) + /* ~<n> */
65 1 + 2 + /* ^NN */
66 1);
68 if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
69 len -= 2;
70 if (generation > 0)
71 sprintf(new_name, "%.*s~%d^%d", len, tip_name,
72 generation, parent_number);
73 else
74 sprintf(new_name, "%.*s^%d", len, tip_name,
75 parent_number);
77 name_rev(parents->item, new_name, 0,
78 distance + MERGE_TRAVERSAL_WEIGHT, 0);
79 } else {
80 name_rev(parents->item, tip_name, generation + 1,
81 distance + 1, 0);
86 static int subpath_matches(const char *path, const char *filter)
88 const char *subpath = path;
90 while (subpath) {
91 if (!fnmatch(filter, subpath, 0))
92 return subpath - path;
93 subpath = strchr(subpath, '/');
94 if (subpath)
95 subpath++;
97 return -1;
100 static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
102 if (shorten_unambiguous)
103 refname = shorten_unambiguous_ref(refname, 0);
104 else if (!prefixcmp(refname, "refs/heads/"))
105 refname = refname + 11;
106 else if (!prefixcmp(refname, "refs/"))
107 refname = refname + 5;
108 return refname;
111 struct name_ref_data {
112 int tags_only;
113 int name_only;
114 const char *ref_filter;
117 static struct tip_table {
118 struct tip_table_entry {
119 unsigned char sha1[20];
120 const char *refname;
121 } *table;
122 int nr;
123 int alloc;
124 int sorted;
125 } tip_table;
127 static void add_to_tip_table(const unsigned char *sha1, const char *refname,
128 int shorten_unambiguous)
130 refname = name_ref_abbrev(refname, shorten_unambiguous);
132 ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
133 hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
134 tip_table.table[tip_table.nr].refname = xstrdup(refname);
135 tip_table.nr++;
136 tip_table.sorted = 0;
139 static int tipcmp(const void *a_, const void *b_)
141 const struct tip_table_entry *a = a_, *b = b_;
142 return hashcmp(a->sha1, b->sha1);
145 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
147 struct object *o = parse_object(sha1);
148 struct name_ref_data *data = cb_data;
149 int can_abbreviate_output = data->tags_only && data->name_only;
150 int deref = 0;
152 if (data->tags_only && prefixcmp(path, "refs/tags/"))
153 return 0;
155 if (data->ref_filter) {
156 switch (subpath_matches(path, data->ref_filter)) {
157 case -1: /* did not match */
158 return 0;
159 case 0: /* matched fully */
160 break;
161 default: /* matched subpath */
162 can_abbreviate_output = 1;
163 break;
167 add_to_tip_table(sha1, path, can_abbreviate_output);
169 while (o && o->type == OBJ_TAG) {
170 struct tag *t = (struct tag *) o;
171 if (!t->tagged)
172 break; /* broken repository */
173 o = parse_object(t->tagged->sha1);
174 deref = 1;
176 if (o && o->type == OBJ_COMMIT) {
177 struct commit *commit = (struct commit *)o;
179 path = name_ref_abbrev(path, can_abbreviate_output);
180 name_rev(commit, xstrdup(path), 0, 0, deref);
182 return 0;
185 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
187 struct tip_table_entry *table = table_;
188 return table[ix].sha1;
191 static const char *get_exact_ref_match(const struct object *o)
193 int found;
195 if (!tip_table.table || !tip_table.nr)
196 return NULL;
198 if (!tip_table.sorted) {
199 qsort(tip_table.table, tip_table.nr, sizeof(*tip_table.table),
200 tipcmp);
201 tip_table.sorted = 1;
204 found = sha1_pos(o->sha1, tip_table.table, tip_table.nr,
205 nth_tip_table_ent);
206 if (0 <= found)
207 return tip_table.table[found].refname;
208 return NULL;
211 /* returns a static buffer */
212 static const char *get_rev_name(const struct object *o)
214 static char buffer[1024];
215 struct rev_name *n;
216 struct commit *c;
218 if (o->type != OBJ_COMMIT)
219 return get_exact_ref_match(o);
220 c = (struct commit *) o;
221 n = c->util;
222 if (!n)
223 return NULL;
225 if (!n->generation)
226 return n->tip_name;
227 else {
228 int len = strlen(n->tip_name);
229 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
230 len -= 2;
231 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
232 n->generation);
234 return buffer;
238 static void show_name(const struct object *obj,
239 const char *caller_name,
240 int always, int allow_undefined, int name_only)
242 const char *name;
243 const unsigned char *sha1 = obj->sha1;
245 if (!name_only)
246 printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
247 name = get_rev_name(obj);
248 if (name)
249 printf("%s\n", name);
250 else if (allow_undefined)
251 printf("undefined\n");
252 else if (always)
253 printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
254 else
255 die("cannot describe '%s'", sha1_to_hex(sha1));
258 static char const * const name_rev_usage[] = {
259 N_("git name-rev [options] <commit>..."),
260 N_("git name-rev [options] --all"),
261 N_("git name-rev [options] --stdin"),
262 NULL
265 static void name_rev_line(char *p, struct name_ref_data *data)
267 int forty = 0;
268 char *p_start;
269 for (p_start = p; *p; p++) {
270 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
271 if (!ishex(*p))
272 forty = 0;
273 else if (++forty == 40 &&
274 !ishex(*(p+1))) {
275 unsigned char sha1[40];
276 const char *name = NULL;
277 char c = *(p+1);
278 int p_len = p - p_start + 1;
280 forty = 0;
282 *(p+1) = 0;
283 if (!get_sha1(p - 39, sha1)) {
284 struct object *o =
285 lookup_object(sha1);
286 if (o)
287 name = get_rev_name(o);
289 *(p+1) = c;
291 if (!name)
292 continue;
294 if (data->name_only)
295 printf("%.*s%s", p_len - 40, p_start, name);
296 else
297 printf("%.*s (%s)", p_len, p_start, name);
298 p_start = p + 1;
302 /* flush */
303 if (p_start != p)
304 fwrite(p_start, p - p_start, 1, stdout);
307 int cmd_name_rev(int argc, const char **argv, const char *prefix)
309 struct object_array revs = OBJECT_ARRAY_INIT;
310 int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
311 struct name_ref_data data = { 0, 0, NULL };
312 struct option opts[] = {
313 OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
314 OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
315 OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
316 N_("only use refs matching <pattern>")),
317 OPT_GROUP(""),
318 OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
319 OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
320 OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
321 OPT_BOOLEAN(0, "always", &always,
322 N_("show abbreviated commit object as fallback")),
324 /* A Hidden OPT_BOOL */
325 OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
326 N_("dereference tags in the input (internal use)"),
327 PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
329 OPT_END(),
332 git_config(git_default_config, NULL);
333 argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
334 if (!!all + !!transform_stdin + !!argc > 1) {
335 error("Specify either a list, or --all, not both!");
336 usage_with_options(name_rev_usage, opts);
338 if (all || transform_stdin)
339 cutoff = 0;
341 for (; argc; argc--, argv++) {
342 unsigned char sha1[20];
343 struct object *object;
344 struct commit *commit;
346 if (get_sha1(*argv, sha1)) {
347 fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
348 *argv);
349 continue;
352 commit = NULL;
353 object = parse_object(sha1);
354 if (object) {
355 struct object *peeled = deref_tag(object, *argv, 0);
356 if (peeled && peeled->type == OBJ_COMMIT)
357 commit = (struct commit *)peeled;
360 if (!object) {
361 fprintf(stderr, "Could not get object for %s. Skipping.\n",
362 *argv);
363 continue;
366 if (commit) {
367 if (cutoff > commit->date)
368 cutoff = commit->date;
371 if (peel_tag) {
372 if (!commit) {
373 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
374 *argv);
375 continue;
377 object = (struct object *)commit;
379 add_object_array(object, *argv, &revs);
382 if (cutoff)
383 cutoff = cutoff - CUTOFF_DATE_SLOP;
384 for_each_ref(name_ref, &data);
386 if (transform_stdin) {
387 char buffer[2048];
389 while (!feof(stdin)) {
390 char *p = fgets(buffer, sizeof(buffer), stdin);
391 if (!p)
392 break;
393 name_rev_line(p, &data);
395 } else if (all) {
396 int i, max;
398 max = get_max_object_index();
399 for (i = 0; i < max; i++) {
400 struct object *obj = get_indexed_object(i);
401 if (!obj || obj->type != OBJ_COMMIT)
402 continue;
403 show_name(obj, NULL,
404 always, allow_undefined, data.name_only);
406 } else {
407 int i;
408 for (i = 0; i < revs.nr; i++)
409 show_name(revs.objects[i].item, revs.objects[i].name,
410 always, allow_undefined, data.name_only);
413 return 0;