Andrew's git / gitweb.git / builtin/name-rev.c
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builtin / name-rev.con commit config: don't implicitly use gitdir or commondir (dc8441f)
   1#include "builtin.h"
   2#include "cache.h"
   3#include "config.h"
   4#include "commit.h"
   5#include "tag.h"
   6#include "refs.h"
   7#include "parse-options.h"
   8#include "sha1-lookup.h"
   9
  10#define CUTOFF_DATE_SLOP 86400 /* one day */
  11
  12typedef struct rev_name {
  13        const char *tip_name;
  14        unsigned long taggerdate;
  15        int generation;
  16        int distance;
  17} rev_name;
  18
  19static long cutoff = LONG_MAX;
  20
  21/* How many generations are maximally preferred over _one_ merge traversal? */
  22#define MERGE_TRAVERSAL_WEIGHT 65535
  23
  24static void name_rev(struct commit *commit,
  25                const char *tip_name, unsigned long taggerdate,
  26                int generation, int distance,
  27                int deref)
  28{
  29        struct rev_name *name = (struct rev_name *)commit->util;
  30        struct commit_list *parents;
  31        int parent_number = 1;
  32
  33        parse_commit(commit);
  34
  35        if (commit->date < cutoff)
  36                return;
  37
  38        if (deref) {
  39                tip_name = xstrfmt("%s^0", tip_name);
  40
  41                if (generation)
  42                        die("generation: %d, but deref?", generation);
  43        }
  44
  45        if (name == NULL) {
  46                name = xmalloc(sizeof(rev_name));
  47                commit->util = name;
  48                goto copy_data;
  49        } else if (name->taggerdate > taggerdate ||
  50                        (name->taggerdate == taggerdate &&
  51                         name->distance > distance)) {
  52copy_data:
  53                name->tip_name = tip_name;
  54                name->taggerdate = taggerdate;
  55                name->generation = generation;
  56                name->distance = distance;
  57        } else
  58                return;
  59
  60        for (parents = commit->parents;
  61                        parents;
  62                        parents = parents->next, parent_number++) {
  63                if (parent_number > 1) {
  64                        size_t len;
  65                        char *new_name;
  66
  67                        strip_suffix(tip_name, "^0", &len);
  68                        if (generation > 0)
  69                                new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
  70                                                   generation, parent_number);
  71                        else
  72                                new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
  73                                                   parent_number);
  74
  75                        name_rev(parents->item, new_name, taggerdate, 0,
  76                                distance + MERGE_TRAVERSAL_WEIGHT, 0);
  77                } else {
  78                        name_rev(parents->item, tip_name, taggerdate,
  79                                generation + 1, distance + 1, 0);
  80                }
  81        }
  82}
  83
  84static int subpath_matches(const char *path, const char *filter)
  85{
  86        const char *subpath = path;
  87
  88        while (subpath) {
  89                if (!wildmatch(filter, subpath, 0, NULL))
  90                        return subpath - path;
  91                subpath = strchr(subpath, '/');
  92                if (subpath)
  93                        subpath++;
  94        }
  95        return -1;
  96}
  97
  98static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
  99{
 100        if (shorten_unambiguous)
 101                refname = shorten_unambiguous_ref(refname, 0);
 102        else if (starts_with(refname, "refs/heads/"))
 103                refname = refname + 11;
 104        else if (starts_with(refname, "refs/"))
 105                refname = refname + 5;
 106        return refname;
 107}
 108
 109struct name_ref_data {
 110        int tags_only;
 111        int name_only;
 112        struct string_list ref_filters;
 113        struct string_list exclude_filters;
 114};
 115
 116static struct tip_table {
 117        struct tip_table_entry {
 118                unsigned char sha1[20];
 119                const char *refname;
 120        } *table;
 121        int nr;
 122        int alloc;
 123        int sorted;
 124} tip_table;
 125
 126static void add_to_tip_table(const unsigned char *sha1, const char *refname,
 127                             int shorten_unambiguous)
 128{
 129        refname = name_ref_abbrev(refname, shorten_unambiguous);
 130
 131        ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
 132        hashcpy(tip_table.table[tip_table.nr].sha1, sha1);
 133        tip_table.table[tip_table.nr].refname = xstrdup(refname);
 134        tip_table.nr++;
 135        tip_table.sorted = 0;
 136}
 137
 138static int tipcmp(const void *a_, const void *b_)
 139{
 140        const struct tip_table_entry *a = a_, *b = b_;
 141        return hashcmp(a->sha1, b->sha1);
 142}
 143
 144static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
 145{
 146        struct object *o = parse_object(oid->hash);
 147        struct name_ref_data *data = cb_data;
 148        int can_abbreviate_output = data->tags_only && data->name_only;
 149        int deref = 0;
 150        unsigned long taggerdate = ULONG_MAX;
 151
 152        if (data->tags_only && !starts_with(path, "refs/tags/"))
 153                return 0;
 154
 155        if (data->exclude_filters.nr) {
 156                struct string_list_item *item;
 157
 158                for_each_string_list_item(item, &data->exclude_filters) {
 159                        if (subpath_matches(path, item->string) >= 0)
 160                                return 0;
 161                }
 162        }
 163
 164        if (data->ref_filters.nr) {
 165                struct string_list_item *item;
 166                int matched = 0;
 167
 168                /* See if any of the patterns match. */
 169                for_each_string_list_item(item, &data->ref_filters) {
 170                        /*
 171                         * Check all patterns even after finding a match, so
 172                         * that we can see if a match with a subpath exists.
 173                         * When a user asked for 'refs/tags/v*' and 'v1.*',
 174                         * both of which match, the user is showing her
 175                         * willingness to accept a shortened output by having
 176                         * the 'v1.*' in the acceptable refnames, so we
 177                         * shouldn't stop when seeing 'refs/tags/v1.4' matches
 178                         * 'refs/tags/v*'.  We should show it as 'v1.4'.
 179                         */
 180                        switch (subpath_matches(path, item->string)) {
 181                        case -1: /* did not match */
 182                                break;
 183                        case 0: /* matched fully */
 184                                matched = 1;
 185                                break;
 186                        default: /* matched subpath */
 187                                matched = 1;
 188                                can_abbreviate_output = 1;
 189                                break;
 190                        }
 191                }
 192
 193                /* If none of the patterns matched, stop now */
 194                if (!matched)
 195                        return 0;
 196        }
 197
 198        add_to_tip_table(oid->hash, path, can_abbreviate_output);
 199
 200        while (o && o->type == OBJ_TAG) {
 201                struct tag *t = (struct tag *) o;
 202                if (!t->tagged)
 203                        break; /* broken repository */
 204                o = parse_object(t->tagged->oid.hash);
 205                deref = 1;
 206                taggerdate = t->date;
 207        }
 208        if (o && o->type == OBJ_COMMIT) {
 209                struct commit *commit = (struct commit *)o;
 210
 211                path = name_ref_abbrev(path, can_abbreviate_output);
 212                name_rev(commit, xstrdup(path), taggerdate, 0, 0, deref);
 213        }
 214        return 0;
 215}
 216
 217static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
 218{
 219        struct tip_table_entry *table = table_;
 220        return table[ix].sha1;
 221}
 222
 223static const char *get_exact_ref_match(const struct object *o)
 224{
 225        int found;
 226
 227        if (!tip_table.table || !tip_table.nr)
 228                return NULL;
 229
 230        if (!tip_table.sorted) {
 231                QSORT(tip_table.table, tip_table.nr, tipcmp);
 232                tip_table.sorted = 1;
 233        }
 234
 235        found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr,
 236                         nth_tip_table_ent);
 237        if (0 <= found)
 238                return tip_table.table[found].refname;
 239        return NULL;
 240}
 241
 242/* may return a constant string or use "buf" as scratch space */
 243static const char *get_rev_name(const struct object *o, struct strbuf *buf)
 244{
 245        struct rev_name *n;
 246        struct commit *c;
 247
 248        if (o->type != OBJ_COMMIT)
 249                return get_exact_ref_match(o);
 250        c = (struct commit *) o;
 251        n = c->util;
 252        if (!n)
 253                return NULL;
 254
 255        if (!n->generation)
 256                return n->tip_name;
 257        else {
 258                int len = strlen(n->tip_name);
 259                if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 260                        len -= 2;
 261                strbuf_reset(buf);
 262                strbuf_addf(buf, "%.*s~%d", len, n->tip_name, n->generation);
 263                return buf->buf;
 264        }
 265}
 266
 267static void show_name(const struct object *obj,
 268                      const char *caller_name,
 269                      int always, int allow_undefined, int name_only)
 270{
 271        const char *name;
 272        const struct object_id *oid = &obj->oid;
 273        struct strbuf buf = STRBUF_INIT;
 274
 275        if (!name_only)
 276                printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
 277        name = get_rev_name(obj, &buf);
 278        if (name)
 279                printf("%s\n", name);
 280        else if (allow_undefined)
 281                printf("undefined\n");
 282        else if (always)
 283                printf("%s\n", find_unique_abbrev(oid->hash, DEFAULT_ABBREV));
 284        else
 285                die("cannot describe '%s'", oid_to_hex(oid));
 286        strbuf_release(&buf);
 287}
 288
 289static char const * const name_rev_usage[] = {
 290        N_("git name-rev [<options>] <commit>..."),
 291        N_("git name-rev [<options>] --all"),
 292        N_("git name-rev [<options>] --stdin"),
 293        NULL
 294};
 295
 296static void name_rev_line(char *p, struct name_ref_data *data)
 297{
 298        struct strbuf buf = STRBUF_INIT;
 299        int forty = 0;
 300        char *p_start;
 301        for (p_start = p; *p; p++) {
 302#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 303                if (!ishex(*p))
 304                        forty = 0;
 305                else if (++forty == 40 &&
 306                         !ishex(*(p+1))) {
 307                        unsigned char sha1[40];
 308                        const char *name = NULL;
 309                        char c = *(p+1);
 310                        int p_len = p - p_start + 1;
 311
 312                        forty = 0;
 313
 314                        *(p+1) = 0;
 315                        if (!get_sha1(p - 39, sha1)) {
 316                                struct object *o =
 317                                        lookup_object(sha1);
 318                                if (o)
 319                                        name = get_rev_name(o, &buf);
 320                        }
 321                        *(p+1) = c;
 322
 323                        if (!name)
 324                                continue;
 325
 326                        if (data->name_only)
 327                                printf("%.*s%s", p_len - 40, p_start, name);
 328                        else
 329                                printf("%.*s (%s)", p_len, p_start, name);
 330                        p_start = p + 1;
 331                }
 332        }
 333
 334        /* flush */
 335        if (p_start != p)
 336                fwrite(p_start, p - p_start, 1, stdout);
 337
 338        strbuf_release(&buf);
 339}
 340
 341int cmd_name_rev(int argc, const char **argv, const char *prefix)
 342{
 343        struct object_array revs = OBJECT_ARRAY_INIT;
 344        int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
 345        struct name_ref_data data = { 0, 0, STRING_LIST_INIT_NODUP, STRING_LIST_INIT_NODUP };
 346        struct option opts[] = {
 347                OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 348                OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
 349                OPT_STRING_LIST(0, "refs", &data.ref_filters, N_("pattern"),
 350                                   N_("only use refs matching <pattern>")),
 351                OPT_STRING_LIST(0, "exclude", &data.exclude_filters, N_("pattern"),
 352                                   N_("ignore refs matching <pattern>")),
 353                OPT_GROUP(""),
 354                OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
 355                OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
 356                OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
 357                OPT_BOOL(0, "always",     &always,
 358                           N_("show abbreviated commit object as fallback")),
 359                {
 360                        /* A Hidden OPT_BOOL */
 361                        OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
 362                        N_("dereference tags in the input (internal use)"),
 363                        PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
 364                },
 365                OPT_END(),
 366        };
 367
 368        git_config(git_default_config, NULL);
 369        argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
 370        if (all + transform_stdin + !!argc > 1) {
 371                error("Specify either a list, or --all, not both!");
 372                usage_with_options(name_rev_usage, opts);
 373        }
 374        if (all || transform_stdin)
 375                cutoff = 0;
 376
 377        for (; argc; argc--, argv++) {
 378                unsigned char sha1[20];
 379                struct object *object;
 380                struct commit *commit;
 381
 382                if (get_sha1(*argv, sha1)) {
 383                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 384                                        *argv);
 385                        continue;
 386                }
 387
 388                commit = NULL;
 389                object = parse_object(sha1);
 390                if (object) {
 391                        struct object *peeled = deref_tag(object, *argv, 0);
 392                        if (peeled && peeled->type == OBJ_COMMIT)
 393                                commit = (struct commit *)peeled;
 394                }
 395
 396                if (!object) {
 397                        fprintf(stderr, "Could not get object for %s. Skipping.\n",
 398                                        *argv);
 399                        continue;
 400                }
 401
 402                if (commit) {
 403                        if (cutoff > commit->date)
 404                                cutoff = commit->date;
 405                }
 406
 407                if (peel_tag) {
 408                        if (!commit) {
 409                                fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 410                                        *argv);
 411                                continue;
 412                        }
 413                        object = (struct object *)commit;
 414                }
 415                add_object_array(object, *argv, &revs);
 416        }
 417
 418        if (cutoff)
 419                cutoff = cutoff - CUTOFF_DATE_SLOP;
 420        for_each_ref(name_ref, &data);
 421
 422        if (transform_stdin) {
 423                char buffer[2048];
 424
 425                while (!feof(stdin)) {
 426                        char *p = fgets(buffer, sizeof(buffer), stdin);
 427                        if (!p)
 428                                break;
 429                        name_rev_line(p, &data);
 430                }
 431        } else if (all) {
 432                int i, max;
 433
 434                max = get_max_object_index();
 435                for (i = 0; i < max; i++) {
 436                        struct object *obj = get_indexed_object(i);
 437                        if (!obj || obj->type != OBJ_COMMIT)
 438                                continue;
 439                        show_name(obj, NULL,
 440                                  always, allow_undefined, data.name_only);
 441                }
 442        } else {
 443                int i;
 444                for (i = 0; i < revs.nr; i++)
 445                        show_name(revs.objects[i].item, revs.objects[i].name,
 446                                  always, allow_undefined, data.name_only);
 447        }
 448
 449        return 0;
 450}