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        if (!commit->object.parsed)
  31                parse_commit(commit);
  32
  33        if (commit->date < cutoff)
  34                return;
  35
  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;
  41
  42                if (generation)
  43                        die("generation: %d, but deref?", generation);
  44        }
  45
  46        if (name == NULL) {
  47                name = xmalloc(sizeof(rev_name));
  48                commit->util = name;
  49                goto copy_data;
  50        } else if (name->distance > distance) {
  51copy_data:
  52                name->tip_name = tip_name;
  53                name->generation = generation;
  54                name->distance = distance;
  55        } else
  56                return;
  57
  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);
  67
  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);
  76
  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);
  82                }
  83        }
  84}
  85
  86static int subpath_matches(const char *path, const char *filter)
  87{
  88        const char *subpath = path;
  89
  90        while (subpath) {
  91                if (!fnmatch(filter, subpath, 0))
  92                        return subpath - path;
  93                subpath = strchr(subpath, '/');
  94                if (subpath)
  95                        subpath++;
  96        }
  97        return -1;
  98}
  99
 100static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
 101{
 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;
 109}
 110
 111struct name_ref_data {
 112        int tags_only;
 113        int name_only;
 114        const char *ref_filter;
 115};
 116
 117static 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;
 126
 127static void add_to_tip_table(const unsigned char *sha1, const char *refname,
 128                             int shorten_unambiguous)
 129{
 130        refname = name_ref_abbrev(refname, shorten_unambiguous);
 131
 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;
 137}
 138
 139static int tipcmp(const void *a_, const void *b_)
 140{
 141        const struct tip_table_entry *a = a_, *b = b_;
 142        return hashcmp(a->sha1, b->sha1);
 143}
 144
 145static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
 146{
 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;
 151
 152        if (data->tags_only && prefixcmp(path, "refs/tags/"))
 153                return 0;
 154
 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;
 164                }
 165        }
 166
 167        add_to_tip_table(sha1, path, can_abbreviate_output);
 168
 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;
 175        }
 176        if (o && o->type == OBJ_COMMIT) {
 177                struct commit *commit = (struct commit *)o;
 178
 179                path = name_ref_abbrev(path, can_abbreviate_output);
 180                name_rev(commit, xstrdup(path), 0, 0, deref);
 181        }
 182        return 0;
 183}
 184
 185static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
 186{
 187        struct tip_table_entry *table = table_;
 188        return table[ix].sha1;
 189}
 190
 191static const char *get_exact_ref_match(const struct object *o)
 192{
 193        int found;
 194
 195        if (!tip_table.table || !tip_table.nr)
 196                return NULL;
 197
 198        if (!tip_table.sorted) {
 199                qsort(tip_table.table, tip_table.nr, sizeof(*tip_table.table),
 200                      tipcmp);
 201                tip_table.sorted = 1;
 202        }
 203
 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;
 209}
 210
 211/* returns a static buffer */
 212static const char *get_rev_name(const struct object *o)
 213{
 214        static char buffer[1024];
 215        struct rev_name *n;
 216        struct commit *c;
 217
 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;
 224
 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);
 233
 234                return buffer;
 235        }
 236}
 237
 238static void show_name(const struct object *obj,
 239                      const char *caller_name,
 240                      int always, int allow_undefined, int name_only)
 241{
 242        const char *name;
 243        const unsigned char *sha1 = obj->sha1;
 244
 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));
 256}
 257
 258static 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
 263};
 264
 265static void name_rev_line(char *p, struct name_ref_data *data)
 266{
 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;
 279
 280                        forty = 0;
 281
 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);
 288                        }
 289                        *(p+1) = c;
 290
 291                        if (!name)
 292                                continue;
 293
 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;
 299                }
 300        }
 301
 302        /* flush */
 303        if (p_start != p)
 304                fwrite(p_start, p - p_start, 1, stdout);
 305}
 306
 307int cmd_name_rev(int argc, const char **argv, const char *prefix)
 308{
 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_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 314                OPT_BOOL(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_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
 319                OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
 320                OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
 321                OPT_BOOL(0, "always",     &always,
 322                           N_("show abbreviated commit object as fallback")),
 323                {
 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,
 328                },
 329                OPT_END(),
 330        };
 331
 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);
 337        }
 338        if (all || transform_stdin)
 339                cutoff = 0;
 340
 341        for (; argc; argc--, argv++) {
 342                unsigned char sha1[20];
 343                struct object *object;
 344                struct commit *commit;
 345
 346                if (get_sha1(*argv, sha1)) {
 347                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 348                                        *argv);
 349                        continue;
 350                }
 351
 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;
 358                }
 359
 360                if (!object) {
 361                        fprintf(stderr, "Could not get object for %s. Skipping.\n",
 362                                        *argv);
 363                        continue;
 364                }
 365
 366                if (commit) {
 367                        if (cutoff > commit->date)
 368                                cutoff = commit->date;
 369                }
 370
 371                if (peel_tag) {
 372                        if (!commit) {
 373                                fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 374                                        *argv);
 375                                continue;
 376                        }
 377                        object = (struct object *)commit;
 378                }
 379                add_object_array(object, *argv, &revs);
 380        }
 381
 382        if (cutoff)
 383                cutoff = cutoff - CUTOFF_DATE_SLOP;
 384        for_each_ref(name_ref, &data);
 385
 386        if (transform_stdin) {
 387                char buffer[2048];
 388
 389                while (!feof(stdin)) {
 390                        char *p = fgets(buffer, sizeof(buffer), stdin);
 391                        if (!p)
 392                                break;
 393                        name_rev_line(p, &data);
 394                }
 395        } else if (all) {
 396                int i, max;
 397
 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);
 405                }
 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);
 411        }
 412
 413        return 0;
 414}