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
   7static const char name_rev_usage[] =
   8        "git-name-rev [--tags] ( --all | --stdin | committish [committish...] )\n";
   9
  10typedef struct rev_name {
  11        const char *tip_name;
  12        int merge_traversals;
  13        int generation;
  14} rev_name;
  15
  16static long cutoff = LONG_MAX;
  17
  18static void name_rev(struct commit *commit,
  19                const char *tip_name, int merge_traversals, int generation,
  20                int deref)
  21{
  22        struct rev_name *name = (struct rev_name *)commit->util;
  23        struct commit_list *parents;
  24        int parent_number = 1;
  25
  26        if (!commit->object.parsed)
  27                parse_commit(commit);
  28
  29        if (commit->date < cutoff)
  30                return;
  31
  32        if (deref) {
  33                char *new_name = xmalloc(strlen(tip_name)+3);
  34                strcpy(new_name, tip_name);
  35                strcat(new_name, "^0");
  36                tip_name = new_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->merge_traversals > merge_traversals ||
  47                        (name->merge_traversals == merge_traversals &&
  48                         name->generation > generation)) {
  49copy_data:
  50                name->tip_name = tip_name;
  51                name->merge_traversals = merge_traversals;
  52                name->generation = generation;
  53        } else
  54                return;
  55
  56        for (parents = commit->parents;
  57                        parents;
  58                        parents = parents->next, parent_number++) {
  59                if (parent_number > 1) {
  60                        int len = strlen(tip_name);
  61                        char *new_name = xmalloc(len + 8);
  62
  63                        if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
  64                                len -= 2;
  65                        if (generation > 0)
  66                                sprintf(new_name, "%.*s~%d^%d", len, tip_name,
  67                                                generation, parent_number);
  68                        else
  69                                sprintf(new_name, "%.*s^%d", len, tip_name,
  70                                                parent_number);
  71
  72                        name_rev(parents->item, new_name,
  73                                merge_traversals + 1 , 0, 0);
  74                } else {
  75                        name_rev(parents->item, tip_name, merge_traversals,
  76                                generation + 1, 0);
  77                }
  78        }
  79}
  80
  81static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
  82{
  83        struct object *o = parse_object(sha1);
  84        int tags_only = *(int*)cb_data;
  85        int deref = 0;
  86
  87        if (tags_only && strncmp(path, "refs/tags/", 10))
  88                return 0;
  89
  90        while (o && o->type == OBJ_TAG) {
  91                struct tag *t = (struct tag *) o;
  92                if (!t->tagged)
  93                        break; /* broken repository */
  94                o = parse_object(t->tagged->sha1);
  95                deref = 1;
  96        }
  97        if (o && o->type == OBJ_COMMIT) {
  98                struct commit *commit = (struct commit *)o;
  99
 100                if (!strncmp(path, "refs/heads/", 11))
 101                        path = path + 11;
 102                else if (!strncmp(path, "refs/", 5))
 103                        path = path + 5;
 104
 105                name_rev(commit, xstrdup(path), 0, 0, deref);
 106        }
 107        return 0;
 108}
 109
 110/* returns a static buffer */
 111static const char* get_rev_name(struct object *o)
 112{
 113        static char buffer[1024];
 114        struct rev_name *n;
 115        struct commit *c;
 116
 117        if (o->type != OBJ_COMMIT)
 118                return "undefined";
 119        c = (struct commit *) o;
 120        n = c->util;
 121        if (!n)
 122                return "undefined";
 123
 124        if (!n->generation)
 125                return n->tip_name;
 126        else {
 127                int len = strlen(n->tip_name);
 128                if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 129                        len -= 2;
 130                snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 131                                n->generation);
 132
 133                return buffer;
 134        }
 135}
 136
 137int cmd_name_rev(int argc, const char **argv, const char *prefix)
 138{
 139        struct object_array revs = { 0, 0, NULL };
 140        int as_is = 0, all = 0, transform_stdin = 0;
 141        int tags_only = 0;
 142
 143        git_config(git_default_config);
 144
 145        if (argc < 2)
 146                usage(name_rev_usage);
 147
 148        for (--argc, ++argv; argc; --argc, ++argv) {
 149                unsigned char sha1[20];
 150                struct object *o;
 151                struct commit *commit;
 152
 153                if (!as_is && (*argv)[0] == '-') {
 154                        if (!strcmp(*argv, "--")) {
 155                                as_is = 1;
 156                                continue;
 157                        } else if (!strcmp(*argv, "--tags")) {
 158                                tags_only = 1;
 159                                continue;
 160                        } else if (!strcmp(*argv, "--all")) {
 161                                if (argc > 1)
 162                                        die("Specify either a list, or --all, not both!");
 163                                all = 1;
 164                                cutoff = 0;
 165                                continue;
 166                        } else if (!strcmp(*argv, "--stdin")) {
 167                                if (argc > 1)
 168                                        die("Specify either a list, or --stdin, not both!");
 169                                transform_stdin = 1;
 170                                cutoff = 0;
 171                                continue;
 172                        }
 173                        usage(name_rev_usage);
 174                }
 175
 176                if (get_sha1(*argv, sha1)) {
 177                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 178                                        *argv);
 179                        continue;
 180                }
 181
 182                o = deref_tag(parse_object(sha1), *argv, 0);
 183                if (!o || o->type != OBJ_COMMIT) {
 184                        fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 185                                        *argv);
 186                        continue;
 187                }
 188
 189                commit = (struct commit *)o;
 190
 191                if (cutoff > commit->date)
 192                        cutoff = commit->date;
 193
 194                add_object_array((struct object *)commit, *argv, &revs);
 195        }
 196
 197        for_each_ref(name_ref, &tags_only);
 198
 199        if (transform_stdin) {
 200                char buffer[2048];
 201                char *p, *p_start;
 202
 203                while (!feof(stdin)) {
 204                        int forty = 0;
 205                        p = fgets(buffer, sizeof(buffer), stdin);
 206                        if (!p)
 207                                break;
 208
 209                        for (p_start = p; *p; p++) {
 210#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 211                                if (!ishex(*p))
 212                                        forty = 0;
 213                                else if (++forty == 40 &&
 214                                                !ishex(*(p+1))) {
 215                                        unsigned char sha1[40];
 216                                        const char *name = "undefined";
 217                                        char c = *(p+1);
 218
 219                                        forty = 0;
 220
 221                                        *(p+1) = 0;
 222                                        if (!get_sha1(p - 39, sha1)) {
 223                                                struct object *o =
 224                                                        lookup_object(sha1);
 225                                                if (o)
 226                                                        name = get_rev_name(o);
 227                                        }
 228                                        *(p+1) = c;
 229
 230                                        if (!strcmp(name, "undefined"))
 231                                                continue;
 232
 233                                        fwrite(p_start, p - p_start + 1, 1,
 234                                               stdout);
 235                                        printf(" (%s)", 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        } else if (all) {
 245                int i, max;
 246
 247                max = get_max_object_index();
 248                for (i = 0; i < max; i++) {
 249                        struct object * obj = get_indexed_object(i);
 250                        if (!obj)
 251                                continue;
 252                        printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
 253                }
 254        } else {
 255                int i;
 256                for (i = 0; i < revs.nr; i++)
 257                        printf("%s %s\n",
 258                                revs.objects[i].name,
 259                                get_rev_name(revs.objects[i].item));
 260        }
 261
 262        return 0;
 263}
 264