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
   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
  99struct name_ref_data {
 100        int tags_only;
 101        int name_only;
 102        const char *ref_filter;
 103};
 104
 105static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
 106{
 107        struct object *o = parse_object(sha1);
 108        struct name_ref_data *data = cb_data;
 109        int can_abbreviate_output = data->tags_only && data->name_only;
 110        int deref = 0;
 111
 112        if (data->tags_only && prefixcmp(path, "refs/tags/"))
 113                return 0;
 114
 115        if (data->ref_filter) {
 116                switch (subpath_matches(path, data->ref_filter)) {
 117                case -1: /* did not match */
 118                        return 0;
 119                case 0:  /* matched fully */
 120                        break;
 121                default: /* matched subpath */
 122                        can_abbreviate_output = 1;
 123                        break;
 124                }
 125        }
 126
 127        while (o && o->type == OBJ_TAG) {
 128                struct tag *t = (struct tag *) o;
 129                if (!t->tagged)
 130                        break; /* broken repository */
 131                o = parse_object(t->tagged->sha1);
 132                deref = 1;
 133        }
 134        if (o && o->type == OBJ_COMMIT) {
 135                struct commit *commit = (struct commit *)o;
 136
 137                if (can_abbreviate_output)
 138                        path = shorten_unambiguous_ref(path, 0);
 139                else if (!prefixcmp(path, "refs/heads/"))
 140                        path = path + 11;
 141                else if (!prefixcmp(path, "refs/"))
 142                        path = path + 5;
 143
 144                name_rev(commit, xstrdup(path), 0, 0, deref);
 145        }
 146        return 0;
 147}
 148
 149/* returns a static buffer */
 150static const char *get_rev_name(const struct object *o)
 151{
 152        static char buffer[1024];
 153        struct rev_name *n;
 154        struct commit *c;
 155
 156        if (o->type != OBJ_COMMIT)
 157                return NULL;
 158        c = (struct commit *) o;
 159        n = c->util;
 160        if (!n)
 161                return NULL;
 162
 163        if (!n->generation)
 164                return n->tip_name;
 165        else {
 166                int len = strlen(n->tip_name);
 167                if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 168                        len -= 2;
 169                snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 170                                n->generation);
 171
 172                return buffer;
 173        }
 174}
 175
 176static void show_name(const struct object *obj,
 177                      const char *caller_name,
 178                      int always, int allow_undefined, int name_only)
 179{
 180        const char *name;
 181        const unsigned char *sha1 = obj->sha1;
 182
 183        if (!name_only)
 184                printf("%s ", caller_name ? caller_name : sha1_to_hex(sha1));
 185        name = get_rev_name(obj);
 186        if (name)
 187                printf("%s\n", name);
 188        else if (allow_undefined)
 189                printf("undefined\n");
 190        else if (always)
 191                printf("%s\n", find_unique_abbrev(sha1, DEFAULT_ABBREV));
 192        else
 193                die("cannot describe '%s'", sha1_to_hex(sha1));
 194}
 195
 196static char const * const name_rev_usage[] = {
 197        N_("git name-rev [options] <commit>..."),
 198        N_("git name-rev [options] --all"),
 199        N_("git name-rev [options] --stdin"),
 200        NULL
 201};
 202
 203static void name_rev_line(char *p, struct name_ref_data *data)
 204{
 205        int forty = 0;
 206        char *p_start;
 207        for (p_start = p; *p; p++) {
 208#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 209                if (!ishex(*p))
 210                        forty = 0;
 211                else if (++forty == 40 &&
 212                         !ishex(*(p+1))) {
 213                        unsigned char sha1[40];
 214                        const char *name = NULL;
 215                        char c = *(p+1);
 216                        int p_len = p - p_start + 1;
 217
 218                        forty = 0;
 219
 220                        *(p+1) = 0;
 221                        if (!get_sha1(p - 39, sha1)) {
 222                                struct object *o =
 223                                        lookup_object(sha1);
 224                                if (o)
 225                                        name = get_rev_name(o);
 226                        }
 227                        *(p+1) = c;
 228
 229                        if (!name)
 230                                continue;
 231
 232                        if (data->name_only)
 233                                printf("%.*s%s", p_len - 40, p_start, name);
 234                        else
 235                                printf("%.*s (%s)", p_len, p_start, name);
 236                        p_start = p + 1;
 237                }
 238        }
 239
 240        /* flush */
 241        if (p_start != p)
 242                fwrite(p_start, p - p_start, 1, stdout);
 243}
 244
 245int cmd_name_rev(int argc, const char **argv, const char *prefix)
 246{
 247        struct object_array revs = OBJECT_ARRAY_INIT;
 248        int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0;
 249        struct name_ref_data data = { 0, 0, NULL };
 250        struct option opts[] = {
 251                OPT_BOOLEAN(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
 252                OPT_BOOLEAN(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
 253                OPT_STRING(0, "refs", &data.ref_filter, N_("pattern"),
 254                                   N_("only use refs matching <pattern>")),
 255                OPT_GROUP(""),
 256                OPT_BOOLEAN(0, "all", &all, N_("list all commits reachable from all refs")),
 257                OPT_BOOLEAN(0, "stdin", &transform_stdin, N_("read from stdin")),
 258                OPT_BOOLEAN(0, "undefined", &allow_undefined, N_("allow to print `undefined` names")),
 259                OPT_BOOLEAN(0, "always",     &always,
 260                           N_("show abbreviated commit object as fallback")),
 261                OPT_END(),
 262        };
 263
 264        git_config(git_default_config, NULL);
 265        argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
 266        if (!!all + !!transform_stdin + !!argc > 1) {
 267                error("Specify either a list, or --all, not both!");
 268                usage_with_options(name_rev_usage, opts);
 269        }
 270        if (all || transform_stdin)
 271                cutoff = 0;
 272
 273        for (; argc; argc--, argv++) {
 274                unsigned char sha1[20];
 275                struct object *o;
 276                struct commit *commit;
 277
 278                if (get_sha1(*argv, sha1)) {
 279                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 280                                        *argv);
 281                        continue;
 282                }
 283
 284                o = deref_tag(parse_object(sha1), *argv, 0);
 285                if (!o || o->type != OBJ_COMMIT) {
 286                        fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 287                                        *argv);
 288                        continue;
 289                }
 290
 291                commit = (struct commit *)o;
 292                if (cutoff > commit->date)
 293                        cutoff = commit->date;
 294                add_object_array((struct object *)commit, *argv, &revs);
 295        }
 296
 297        if (cutoff)
 298                cutoff = cutoff - CUTOFF_DATE_SLOP;
 299        for_each_ref(name_ref, &data);
 300
 301        if (transform_stdin) {
 302                char buffer[2048];
 303
 304                while (!feof(stdin)) {
 305                        char *p = fgets(buffer, sizeof(buffer), stdin);
 306                        if (!p)
 307                                break;
 308                        name_rev_line(p, &data);
 309                }
 310        } else if (all) {
 311                int i, max;
 312
 313                max = get_max_object_index();
 314                for (i = 0; i < max; i++) {
 315                        struct object *obj = get_indexed_object(i);
 316                        if (!obj || obj->type != OBJ_COMMIT)
 317                                continue;
 318                        show_name(obj, NULL,
 319                                  always, allow_undefined, data.name_only);
 320                }
 321        } else {
 322                int i;
 323                for (i = 0; i < revs.nr; i++)
 324                        show_name(revs.objects[i].item, revs.objects[i].name,
 325                                  always, allow_undefined, data.name_only);
 326        }
 327
 328        return 0;
 329}