Andrew's git - gitweb.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
  11typedef struct rev_name {
  12        const char *tip_name;
  13        int generation;
  14        int distance;
  15} rev_name;
  16
  17static long cutoff = LONG_MAX;
  18
  19/* How many generations are maximally preferred over _one_ merge traversal? */
  20#define MERGE_TRAVERSAL_WEIGHT 65535
  21
  22static 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) {
  47copy_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
  78static 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
  92static 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
 103struct name_ref_data {
 104        int tags_only;
 105        int name_only;
 106        const char *ref_filter;
 107};
 108
 109static 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
 119static 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
 131static 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
 137static 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(t->tagged->oid.hash);
 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
 177static 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
 183static 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(o->oid.hash, 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 */
 204static 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
 230static 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
 250static 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
 257static 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
 299int 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}