git.oblomov.eu Git - git/blob - 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                         int len = strlen(tip_name);
  59                         char *new_name;
  60
  61                         if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
  62                                 len -= 2;
  63                         if (generation > 0)
  64                                 new_name = xstrfmt("%.*s~%d^%d", len, tip_name,
  65                                                    generation, parent_number);
  66                         else
  67                                 new_name = xstrfmt("%.*s^%d", len, tip_name,
  68                                                    parent_number);
  69
  70                         name_rev(parents->item, new_name, 0,
  71                                 distance + MERGE_TRAVERSAL_WEIGHT, 0);
  72                 } else {
  73                         name_rev(parents->item, tip_name, generation + 1,
  74                                 distance + 1, 0);
  75                 }
  76         }
  77 }
  78
  79 static int subpath_matches(const char *path, const char *filter)
  80 {
  81         const char *subpath = path;
  82
  83         while (subpath) {
  84                 if (!wildmatch(filter, subpath, 0, NULL))
  85                         return subpath - path;
  86                 subpath = strchr(subpath, '/');
  87                 if (subpath)
  88                         subpath++;
  89         }
  90         return -1;
  91 }
  92
  93 static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
  94 {
  95         if (shorten_unambiguous)
  96                 refname = shorten_unambiguous_ref(refname, 0);
  97         else if (starts_with(refname, "refs/heads/"))
  98                 refname = refname + 11;
  99         else if (starts_with(refname, "refs/"))
 100                 refname = refname + 5;
 101         return refname;
 102 }
 103
 104 struct name_ref_data {
 105         int tags_only;
 106         int name_only;
 107         const char *ref_filter;
 108 };
 109
 110 static struct tip_table {
 111         struct tip_table_entry {
 112                 unsigned char sha1[20];
 113                 const char *refname;
 114         } *table;
 115         int nr;
 116         int alloc;
 117         int sorted;
 118 } tip_table;
 119
 120 static void add_to_tip_table(const unsigned char *sha1, const char *refname,
 121                              int shorten_unambiguous)
 122 {
 123         refname = name_ref_abbrev(refname, shorten_unambiguous);
 124
 125         ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
 126         hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
 127         tip_table.table[tip_table.nr].refname = xstrdup(refname);
 128         tip_table.nr++;
 129         tip_table.sorted = 0;
 130 }
 131
 132 static int tipcmp(const void *a_, const void *b_)
 133 {
 134         const struct tip_table_entry *a = a_, *b = b_;
 135         return hashcmp(a->sha1, b->sha1);
 136 }
 137
 138 static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
 139 {
 140         struct object *o = parse_object(oid->hash);
 141         struct name_ref_data *data = cb_data;
 142         int can_abbreviate_output = data->tags_only && data->name_only;
 143         int deref = 0;
 144
 145         if (data->tags_only && !starts_with(path, "refs/tags/"))
 146                 return 0;
 147
 148         if (data->ref_filter) {
 149                 switch (subpath_matches(path, data->ref_filter)) {
 150                 case -1: /* did not match */
 151                         return 0;
 152                 case 0:  /* matched fully */
 153                         break;
 154                 default: /* matched subpath */
 155                         can_abbreviate_output = 1;
 156                         break;
 157                 }
 158         }
 159
 160         add_to_tip_table(oid->hash, path, can_abbreviate_output);
 161
 162         while (o && o->type == OBJ_TAG) {
 163                 struct tag *t = (struct tag *) o;
 164                 if (!t->tagged)
 165                         break; /* broken repository */
 166                 o = parse_object(t->tagged->sha1);
 167                 deref = 1;
 168         }
 169         if (o && o->type == OBJ_COMMIT) {
 170                 struct commit *commit = (struct commit *)o;
 171
 172                 path = name_ref_abbrev(path, can_abbreviate_output);
 173                 name_rev(commit, xstrdup(path), 0, 0, deref);
 174         }
 175         return 0;
 176 }
 177
 178 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
 179 {
 180         struct tip_table_entry *table = table_;
 181         return table[ix].sha1;
 182 }
 183
 184 static const char *get_exact_ref_match(const struct object *o)
 185 {
 186         int found;
 187
 188         if (!tip_table.table || !tip_table.nr)
 189                 return NULL;
 190
 191         if (!tip_table.sorted) {
 192                 qsort(tip_table.table, tip_table.nr, sizeof(*tip_table.table),
 193                       tipcmp);
 194                 tip_table.sorted = 1;
 195         }
 196
 197         found = sha1_pos(o->sha1, tip_table.table, tip_table.nr,
 198                          nth_tip_table_ent);
 199         if (0 <= found)
 200                 return tip_table.table[found].refname;
 201         return NULL;
 202 }
 203
 204 /* returns a static buffer */
 205 static const char *get_rev_name(const struct object *o)
 206 {
 207         static char buffer[1024];
 208         struct rev_name *n;
 209         struct commit *c;
 210
 211         if (o->type != OBJ_COMMIT)
 212                 return get_exact_ref_match(o);
 213         c = (struct commit *) o;
 214         n = c->util;
 215         if (!n)
 216                 return NULL;
 217
 218         if (!n->generation)
 219                 return n->tip_name;
 220         else {
 221                 int len = strlen(n->tip_name);
 222                 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 223                         len -= 2;
 224                 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 225                                 n->generation);
 226
 227                 return buffer;
 228         }
 229 }
 230
 231 static void show_name(const struct object *obj,
 232                       const char *caller_name,
 233                       int always, int allow_undefined, int name_only)
 234 {
 235         const char *name;
 236         const unsigned char *sha1 = obj->sha1;
 237
 238         if (!name_only)
 239                 printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
 240         name = get_rev_name(obj);
 241         if (name)
 242                 printf("%s\n", name);
 243         else if (allow_undefined)
 244                 printf("undefined\n");
 245         else if (always)
 246                 printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
 247         else
 248                 die("cannot describe '%s'", sha1_to_hex(sha1));
 249 }
 250
 251 static char const * const name_rev_usage[] = {
 252         N_("git name-rev [<options>] <commit>..."),
 253         N_("git name-rev [<options>] --all"),
 254         N_("git name-rev [<options>] --stdin"),
 255         NULL
 256 };
 257
 258 static void name_rev_line(char *p, struct name_ref_data *data)
 259 {
 260         int forty = 0;
 261         char *p_start;
 262         for (p_start = p; *p; p++) {
 263 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 264                 if (!ishex(*p))
 265                         forty = 0;
 266                 else if (++forty == 40 &&
 267                          !ishex(*(p+1))) {
 268                         unsigned char sha1[40];
 269                         const char *name = NULL;
 270                         char c = *(p+1);
 271                         int p_len = p - p_start + 1;
 272
 273                         forty = 0;
 274
 275                         *(p+1) = 0;
 276                         if (!get_sha1(p - 39, sha1)) {
 277                                 struct object *o =
 278                                         lookup_object(sha1);
 279                                 if (o)
 280                                         name = get_rev_name(o);
 281                         }
 282                         *(p+1) = c;
 283
 284                         if (!name)
 285                                 continue;
 286
 287                         if (data->name_only)
 288                                 printf("%.*s%s", p_len - 40, p_start, name);
 289                         else
 290                                 printf("%.*s (%s)", p_len, p_start, name);
 291                         p_start = p + 1;
 292                 }
 293         }
 294
 295         /* flush */
 296         if (p_start != p)
 297                 fwrite(p_start, p - p_start, 1, stdout);
 298 }
 299
 300 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 301 {
 302         struct object_array revs = OBJECT_ARRAY_INIT;
 303         int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
 304         struct name_ref_data data = { 0, 0, NULL };
 305         struct option opts[] = {
 306                 OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 307                 OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
 308                 OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
 309                                    N_("only use refs matching <pattern>")),
 310                 OPT_GROUP(""),
 311                 OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
 312                 OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
 313                 OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
 314                 OPT_BOOL(0, "always",     &always,
 315                            N_("show abbreviated commit object as fallback")),
 316                 {
 317                         /* A Hidden OPT_BOOL */
 318                         OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
 319                         N_("dereference tags in the input (internal use)"),
 320                         PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
 321                 },
 322                 OPT_END(),
 323         };
 324
 325         git_config(git_default_config, NULL);
 326         argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
 327         if (all + transform_stdin + !!argc > 1) {
 328                 error("Specify either a list, or --all, not both!");
 329                 usage_with_options(name_rev_usage, opts);
 330         }
 331         if (all || transform_stdin)
 332                 cutoff = 0;
 333
 334         for (; argc; argc--, argv++) {
 335                 unsigned char sha1[20];
 336                 struct object *object;
 337                 struct commit *commit;
 338
 339                 if (get_sha1(*argv, sha1)) {
 340                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 341                                         *argv);
 342                         continue;
 343                 }
 344
 345                 commit = NULL;
 346                 object = parse_object(sha1);
 347                 if (object) {
 348                         struct object *peeled = deref_tag(object, *argv, 0);
 349                         if (peeled && peeled->type == OBJ_COMMIT)
 350                                 commit = (struct commit *)peeled;
 351                 }
 352
 353                 if (!object) {
 354                         fprintf(stderr, "Could not get object for %s. Skipping.\n",
 355                                         *argv);
 356                         continue;
 357                 }
 358
 359                 if (commit) {
 360                         if (cutoff > commit->date)
 361                                 cutoff = commit->date;
 362                 }
 363
 364                 if (peel_tag) {
 365                         if (!commit) {
 366                                 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 367                                         *argv);
 368                                 continue;
 369                         }
 370                         object = (struct object *)commit;
 371                 }
 372                 add_object_array(object, *argv, &revs);
 373         }
 374
 375         if (cutoff)
 376                 cutoff = cutoff - CUTOFF_DATE_SLOP;
 377         for_each_ref(name_ref, &data);
 378
 379         if (transform_stdin) {
 380                 char buffer[2048];
 381
 382                 while (!feof(stdin)) {
 383                         char *p = fgets(buffer, sizeof(buffer), stdin);
 384                         if (!p)
 385                                 break;
 386                         name_rev_line(p, &data);
 387                 }
 388         } else if (all) {
 389                 int i, max;
 390
 391                 max = get_max_object_index();
 392                 for (i = 0; i < max; i++) {
 393                         struct object *obj = get_indexed_object(i);
 394                         if (!obj || obj->type != OBJ_COMMIT)
 395                                 continue;
 396                         show_name(obj, NULL,
 397                                   always, allow_undefined, data.name_only);
 398                 }
 399         } else {
 400                 int i;
 401                 for (i = 0; i < revs.nr; i++)
 402                         show_name(revs.objects[i].item, revs.objects[i].name,
 403                                   always, allow_undefined, data.name_only);
 404         }
 405
 406         return 0;
 407 }