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         const char *ref_filter;
 112 };
 113
 114 static struct tip_table {
 115         struct tip_table_entry {
 116                 unsigned char sha1[20];
 117                 const char *refname;
 118         } *table;
 119         int nr;
 120         int alloc;
 121         int sorted;
 122 } tip_table;
 123
 124 static void add_to_tip_table(const unsigned char *sha1, const char *refname,
 125                              int shorten_unambiguous)
 126 {
 127         refname = name_ref_abbrev(refname, shorten_unambiguous);
 128
 129         ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
 130         hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
 131         tip_table.table[tip_table.nr].refname = xstrdup(refname);
 132         tip_table.nr++;
 133         tip_table.sorted = 0;
 134 }
 135
 136 static int tipcmp(const void *a_, const void *b_)
 137 {
 138         const struct tip_table_entry *a = a_, *b = b_;
 139         return hashcmp(a->sha1, b->sha1);
 140 }
 141
 142 static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
 143 {
 144         struct object *o = parse_object(oid->hash);
 145         struct name_ref_data *data = cb_data;
 146         int can_abbreviate_output = data->tags_only && data->name_only;
 147         int deref = 0;
 148         unsigned long taggerdate = ULONG_MAX;
 149
 150         if (data->tags_only && !starts_with(path, "refs/tags/"))
 151                 return 0;
 152
 153         if (data->ref_filter) {
 154                 switch (subpath_matches(path, data->ref_filter)) {
 155                 case -1: /* did not match */
 156                         return 0;
 157                 case 0:  /* matched fully */
 158                         break;
 159                 default: /* matched subpath */
 160                         can_abbreviate_output = 1;
 161                         break;
 162                 }
 163         }
 164
 165         add_to_tip_table(oid->hash, path, can_abbreviate_output);
 166
 167         while (o && o->type == OBJ_TAG) {
 168                 struct tag *t = (struct tag *) o;
 169                 if (!t->tagged)
 170                         break; /* broken repository */
 171                 o = parse_object(t->tagged->oid.hash);
 172                 deref = 1;
 173                 taggerdate = t->date;
 174         }
 175         if (o && o->type == OBJ_COMMIT) {
 176                 struct commit *commit = (struct commit *)o;
 177
 178                 path = name_ref_abbrev(path, can_abbreviate_output);
 179                 name_rev(commit, xstrdup(path), taggerdate, 0, 0, deref);
 180         }
 181         return 0;
 182 }
 183
 184 static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
 185 {
 186         struct tip_table_entry *table = table_;
 187         return table[ix].sha1;
 188 }
 189
 190 static const char *get_exact_ref_match(const struct object *o)
 191 {
 192         int found;
 193
 194         if (!tip_table.table || !tip_table.nr)
 195                 return NULL;
 196
 197         if (!tip_table.sorted) {
 198                 QSORT(tip_table.table, tip_table.nr, tipcmp);
 199                 tip_table.sorted = 1;
 200         }
 201
 202         found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr,
 203                          nth_tip_table_ent);
 204         if (0 <= found)
 205                 return tip_table.table[found].refname;
 206         return NULL;
 207 }
 208
 209 /* returns a static buffer */
 210 static const char *get_rev_name(const struct object *o)
 211 {
 212         static char buffer[1024];
 213         struct rev_name *n;
 214         struct commit *c;
 215
 216         if (o->type != OBJ_COMMIT)
 217                 return get_exact_ref_match(o);
 218         c = (struct commit *) o;
 219         n = c->util;
 220         if (!n)
 221                 return NULL;
 222
 223         if (!n->generation)
 224                 return n->tip_name;
 225         else {
 226                 int len = strlen(n->tip_name);
 227                 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 228                         len -= 2;
 229                 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 230                                 n->generation);
 231
 232                 return buffer;
 233         }
 234 }
 235
 236 static void show_name(const struct object *obj,
 237                       const char *caller_name,
 238                       int always, int allow_undefined, int name_only)
 239 {
 240         const char *name;
 241         const struct object_id *oid = &obj->oid;
 242
 243         if (!name_only)
 244                 printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
 245         name = get_rev_name(obj);
 246         if (name)
 247                 printf("%s\n", name);
 248         else if (allow_undefined)
 249                 printf("undefined\n");
 250         else if (always)
 251                 printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
 252         else
 253                 die("cannot describe '%s'", oid_to_hex(oid));
 254 }
 255
 256 static char const * const name_rev_usage[] = {
 257         N_("git name-rev [<options>] <commit>..."),
 258         N_("git name-rev [<options>] --all"),
 259         N_("git name-rev [<options>] --stdin"),
 260         NULL
 261 };
 262
 263 static void name_rev_line(char *p, struct name_ref_data *data)
 264 {
 265         int forty = 0;
 266         char *p_start;
 267         for (p_start = p; *p; p++) {
 268 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 269                 if (!ishex(*p))
 270                         forty = 0;
 271                 else if (++forty == 40 &&
 272                          !ishex(*(p+1))) {
 273                         unsigned char sha1[40];
 274                         const char *name = NULL;
 275                         char c = *(p+1);
 276                         int p_len = p - p_start + 1;
 277
 278                         forty = 0;
 279
 280                         *(p+1) = 0;
 281                         if (!get_sha1(p - 39, sha1)) {
 282                                 struct object *o =
 283                                         lookup_object(sha1);
 284                                 if (o)
 285                                         name = get_rev_name(o);
 286                         }
 287                         *(p+1) = c;
 288
 289                         if (!name)
 290                                 continue;
 291
 292                         if (data->name_only)
 293                                 printf("%.*s%s", p_len - 40, p_start, name);
 294                         else
 295                                 printf("%.*s (%s)", p_len, p_start, name);
 296                         p_start = p + 1;
 297                 }
 298         }
 299
 300         /* flush */
 301         if (p_start != p)
 302                 fwrite(p_start, p - p_start, 1, stdout);
 303 }
 304
 305 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 306 {
 307         struct object_array revs = OBJECT_ARRAY_INIT;
 308         int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
 309         struct name_ref_data data = { 0, 0, NULL };
 310         struct option opts[] = {
 311                 OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 312                 OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
 313                 OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
 314                                    N_("only use refs matching <pattern>")),
 315                 OPT_GROUP(""),
 316                 OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
 317                 OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
 318                 OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
 319                 OPT_BOOL(0, "always",     &always,
 320                            N_("show abbreviated commit object as fallback")),
 321                 {
 322                         /* A Hidden OPT_BOOL */
 323                         OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
 324                         N_("dereference tags in the input (internal use)"),
 325                         PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
 326                 },
 327                 OPT_END(),
 328         };
 329
 330         git_config(git_default_config, NULL);
 331         argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
 332         if (all + transform_stdin + !!argc > 1) {
 333                 error("Specify either a list, or --all, not both!");
 334                 usage_with_options(name_rev_usage, opts);
 335         }
 336         if (all || transform_stdin)
 337                 cutoff = 0;
 338
 339         for (; argc; argc--, argv++) {
 340                 unsigned char sha1[20];
 341                 struct object *object;
 342                 struct commit *commit;
 343
 344                 if (get_sha1(*argv, sha1)) {
 345                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 346                                         *argv);
 347                         continue;
 348                 }
 349
 350                 commit = NULL;
 351                 object = parse_object(sha1);
 352                 if (object) {
 353                         struct object *peeled = deref_tag(object, *argv, 0);
 354                         if (peeled && peeled->type == OBJ_COMMIT)
 355                                 commit = (struct commit *)peeled;
 356                 }
 357
 358                 if (!object) {
 359                         fprintf(stderr, "Could not get object for %s. Skipping.\n",
 360                                         *argv);
 361                         continue;
 362                 }
 363
 364                 if (commit) {
 365                         if (cutoff > commit->date)
 366                                 cutoff = commit->date;
 367                 }
 368
 369                 if (peel_tag) {
 370                         if (!commit) {
 371                                 fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 372                                         *argv);
 373                                 continue;
 374                         }
 375                         object = (struct object *)commit;
 376                 }
 377                 add_object_array(object, *argv, &revs);
 378         }
 379
 380         if (cutoff)
 381                 cutoff = cutoff - CUTOFF_DATE_SLOP;
 382         for_each_ref(name_ref, &data);
 383
 384         if (transform_stdin) {
 385                 char buffer[2048];
 386
 387                 while (!feof(stdin)) {
 388                         char *p = fgets(buffer, sizeof(buffer), stdin);
 389                         if (!p)
 390                                 break;
 391                         name_rev_line(p, &data);
 392                 }
 393         } else if (all) {
 394                 int i, max;
 395
 396                 max = get_max_object_index();
 397                 for (i = 0; i < max; i++) {
 398                         struct object *obj = get_indexed_object(i);
 399                         if (!obj || obj->type != OBJ_COMMIT)
 400                                 continue;
 401                         show_name(obj, NULL,
 402                                   always, allow_undefined, data.name_only);
 403                 }
 404         } else {
 405                 int i;
 406                 for (i = 0; i < revs.nr; i++)
 407                         show_name(revs.objects[i].item, revs.objects[i].name,
 408                                   always, allow_undefined, data.name_only);
 409         }
 410
 411         return 0;
 412 }