Andrew's git - gitweb.git/blob

1234ebb5d8ff3fb194b9d20f5497d5bfaeb6b5a8
   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
   8#define CUTOFF_DATE_SLOP 86400 /* one day */
   9
  10typedef struct rev_name {
  11        const char *tip_name;
  12        int generation;
  13        int distance;
  14} rev_name;
  15
  16static long cutoff = LONG_MAX;
  17
  18/* How many generations are maximally preferred over _one_ merge traversal? */
  19#define MERGE_TRAVERSAL_WEIGHT 65535
  20
  21static void name_rev(struct commit *commit,
  22                const char *tip_name, int generation, int distance,
  23                int deref)
  24{
  25        struct rev_name *name = (struct rev_name *)commit->util;
  26        struct commit_list *parents;
  27        int parent_number = 1;
  28
  29        if (!commit->object.parsed)
  30                parse_commit(commit);
  31
  32        if (commit->date < cutoff)
  33                return;
  34
  35        if (deref) {
  36                char *new_name = xmalloc(strlen(tip_name)+3);
  37                strcpy(new_name, tip_name);
  38                strcat(new_name, "^0");
  39                tip_name = new_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->distance > distance) {
  50copy_data:
  51                name->tip_name = tip_name;
  52                name->generation = generation;
  53                name->distance = distance;
  54        } else
  55                return;
  56
  57        for (parents = commit->parents;
  58                        parents;
  59                        parents = parents->next, parent_number++) {
  60                if (parent_number > 1) {
  61                        int len = strlen(tip_name);
  62                        char *new_name = xmalloc(len +
  63                                1 + decimal_length(generation) +  /* ~<n> */
  64                                1 + 2 +                           /* ^NN */
  65                                1);
  66
  67                        if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
  68                                len -= 2;
  69                        if (generation > 0)
  70                                sprintf(new_name, "%.*s~%d^%d", len, tip_name,
  71                                                generation, parent_number);
  72                        else
  73                                sprintf(new_name, "%.*s^%d", len, tip_name,
  74                                                parent_number);
  75
  76                        name_rev(parents->item, new_name, 0,
  77                                distance + MERGE_TRAVERSAL_WEIGHT, 0);
  78                } else {
  79                        name_rev(parents->item, tip_name, generation + 1,
  80                                distance + 1, 0);
  81                }
  82        }
  83}
  84
  85static int subpath_matches(const char *path, const char *filter)
  86{
  87        const char *subpath = path;
  88
  89        while (subpath) {
  90                if (!fnmatch(filter, subpath, 0))
  91                        return subpath - path;
  92                subpath = strchr(subpath, '/');
  93                if (subpath)
  94                        subpath++;
  95        }
  96        return -1;
  97}
  98
  99static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
 100{
 101        if (shorten_unambiguous)
 102                refname = shorten_unambiguous_ref(refname, 0);
 103        else if (!prefixcmp(refname, "refs/heads/"))
 104                refname = refname + 11;
 105        else if (!prefixcmp(refname, "refs/"))
 106                refname = refname + 5;
 107        return refname;
 108}
 109
 110struct name_ref_data {
 111        int tags_only;
 112        int name_only;
 113        const char *ref_filter;
 114};
 115
 116static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
 117{
 118        struct object *o = parse_object(sha1);
 119        struct name_ref_data *data = cb_data;
 120        int can_abbreviate_output = data->tags_only && data->name_only;
 121        int deref = 0;
 122
 123        if (data->tags_only && prefixcmp(path, "refs/tags/"))
 124                return 0;
 125
 126        if (data->ref_filter) {
 127                switch (subpath_matches(path, data->ref_filter)) {
 128                case -1: /* did not match */
 129                        return 0;
 130                case 0:  /* matched fully */
 131                        break;
 132                default: /* matched subpath */
 133                        can_abbreviate_output = 1;
 134                        break;
 135                }
 136        }
 137
 138        while (o && o->type == OBJ_TAG) {
 139                struct tag *t = (struct tag *) o;
 140                if (!t->tagged)
 141                        break; /* broken repository */
 142                o = parse_object(t->tagged->sha1);
 143                deref = 1;
 144        }
 145        if (o && o->type == OBJ_COMMIT) {
 146                struct commit *commit = (struct commit *)o;
 147
 148                path = name_ref_abbrev(path, can_abbreviate_output);
 149                name_rev(commit, xstrdup(path), 0, 0, deref);
 150        }
 151        return 0;
 152}
 153
 154/* returns a static buffer */
 155static const char *get_rev_name(const struct object *o)
 156{
 157        static char buffer[1024];
 158        struct rev_name *n;
 159        struct commit *c;
 160
 161        if (o->type != OBJ_COMMIT)
 162                return NULL;
 163        c = (struct commit *) o;
 164        n = c->util;
 165        if (!n)
 166                return NULL;
 167
 168        if (!n->generation)
 169                return n->tip_name;
 170        else {
 171                int len = strlen(n->tip_name);
 172                if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 173                        len -= 2;
 174                snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 175                                n->generation);
 176
 177                return buffer;
 178        }
 179}
 180
 181static void show_name(const struct object *obj,
 182                      const char *caller_name,
 183                      int always, int allow_undefined, int name_only)
 184{
 185        const char *name;
 186        const unsigned char *sha1 = obj->sha1;
 187
 188        if (!name_only)
 189                printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
 190        name = get_rev_name(obj);
 191        if (name)
 192                printf("%s\n", name);
 193        else if (allow_undefined)
 194                printf("undefined\n");
 195        else if (always)
 196                printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
 197        else
 198                die("cannot describe '%s'", sha1_to_hex(sha1));
 199}
 200
 201static char const * const name_rev_usage[] = {
 202        N_("git name-rev [options] <commit>..."),
 203        N_("git name-rev [options] --all"),
 204        N_("git name-rev [options] --stdin"),
 205        NULL
 206};
 207
 208static void name_rev_line(char *p, struct name_ref_data *data)
 209{
 210        int forty = 0;
 211        char *p_start;
 212        for (p_start = p; *p; p++) {
 213#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 214                if (!ishex(*p))
 215                        forty = 0;
 216                else if (++forty == 40 &&
 217                         !ishex(*(p+1))) {
 218                        unsigned char sha1[40];
 219                        const char *name = NULL;
 220                        char c = *(p+1);
 221                        int p_len = p - p_start + 1;
 222
 223                        forty = 0;
 224
 225                        *(p+1) = 0;
 226                        if (!get_sha1(p - 39, sha1)) {
 227                                struct object *o =
 228                                        lookup_object(sha1);
 229                                if (o)
 230                                        name = get_rev_name(o);
 231                        }
 232                        *(p+1) = c;
 233
 234                        if (!name)
 235                                continue;
 236
 237                        if (data->name_only)
 238                                printf("%.*s%s", p_len - 40, p_start, name);
 239                        else
 240                                printf("%.*s (%s)", p_len, p_start, name);
 241                        p_start = p + 1;
 242                }
 243        }
 244
 245        /* flush */
 246        if (p_start != p)
 247                fwrite(p_start, p - p_start, 1, stdout);
 248}
 249
 250int cmd_name_rev(int argc, const char **argv, const char *prefix)
 251{
 252        struct object_array revs = OBJECT_ARRAY_INIT;
 253        int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
 254        struct name_ref_data data = { 0, 0, NULL };
 255        struct option opts[] = {
 256                OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 257                OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
 258                OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
 259                                   N_("only use refs matching <pattern>")),
 260                OPT_GROUP(""),
 261                OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
 262                OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
 263                OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
 264                OPT_BOOLEAN(0, "always",     &always,
 265                           N_("show abbreviated commit object as fallback")),
 266                OPT_END(),
 267        };
 268
 269        git_config(git_default_config, NULL);
 270        argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
 271        if (!!all + !!transform_stdin + !!argc > 1) {
 272                error("Specify either a list, or --all, not both!");
 273                usage_with_options(name_rev_usage, opts);
 274        }
 275        if (all || transform_stdin)
 276                cutoff = 0;
 277
 278        for (; argc; argc--, argv++) {
 279                unsigned char sha1[20];
 280                struct object *o;
 281                struct commit *commit;
 282
 283                if (get_sha1(*argv, sha1)) {
 284                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 285                                        *argv);
 286                        continue;
 287                }
 288
 289                o = deref_tag(parse_object(sha1), *argv, 0);
 290                if (!o || o->type != OBJ_COMMIT) {
 291                        fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 292                                        *argv);
 293                        continue;
 294                }
 295
 296                commit = (struct commit *)o;
 297                if (cutoff > commit->date)
 298                        cutoff = commit->date;
 299                add_object_array((struct object *)commit, *argv, &revs);
 300        }
 301
 302        if (cutoff)
 303                cutoff = cutoff - CUTOFF_DATE_SLOP;
 304        for_each_ref(name_ref, &data);
 305
 306        if (transform_stdin) {
 307                char buffer[2048];
 308
 309                while (!feof(stdin)) {
 310                        char *p = fgets(buffer, sizeof(buffer), stdin);
 311                        if (!p)
 312                                break;
 313                        name_rev_line(p, &data);
 314                }
 315        } else if (all) {
 316                int i, max;
 317
 318                max = get_max_object_index();
 319                for (i = 0; i < max; i++) {
 320                        struct object *obj = get_indexed_object(i);
 321                        if (!obj || obj->type != OBJ_COMMIT)
 322                                continue;
 323                        show_name(obj, NULL,
 324                                  always, allow_undefined, data.name_only);
 325                }
 326        } else {
 327                int i;
 328                for (i = 0; i < revs.nr; i++)
 329                        show_name(revs.objects[i].item, revs.objects[i].name,
 330                                  always, allow_undefined, data.name_only);
 331        }
 332
 333        return 0;
 334}