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                        char *new_name = xmalloc(strlen(tip_name)+8);
  61
  62                        if (generation > 0)
  63                                sprintf(new_name, "%s~%d^%d", tip_name,
  64                                                generation, parent_number);
  65                        else
  66                                sprintf(new_name, "%s^%d", tip_name, parent_number);
  67
  68                        name_rev(parents->item, new_name,
  69                                merge_traversals + 1 , 0, 0);
  70                } else {
  71                        name_rev(parents->item, tip_name, merge_traversals,
  72                                generation + 1, 0);
  73                }
  74        }
  75}
  76
  77static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
  78{
  79        struct object *o = parse_object(sha1);
  80        int tags_only = *(int*)cb_data;
  81        int deref = 0;
  82
  83        if (tags_only && strncmp(path, "refs/tags/", 10))
  84                return 0;
  85
  86        while (o && o->type == OBJ_TAG) {
  87                struct tag *t = (struct tag *) o;
  88                if (!t->tagged)
  89                        break; /* broken repository */
  90                o = parse_object(t->tagged->sha1);
  91                deref = 1;
  92        }
  93        if (o && o->type == OBJ_COMMIT) {
  94                struct commit *commit = (struct commit *)o;
  95
  96                if (!strncmp(path, "refs/heads/", 11))
  97                        path = path + 11;
  98                else if (!strncmp(path, "refs/", 5))
  99                        path = path + 5;
 100
 101                name_rev(commit, xstrdup(path), 0, 0, deref);
 102        }
 103        return 0;
 104}
 105
 106/* returns a static buffer */
 107static const char* get_rev_name(struct object *o)
 108{
 109        static char buffer[1024];
 110        struct rev_name *n;
 111        struct commit *c;
 112
 113        if (o->type != OBJ_COMMIT)
 114                return "undefined";
 115        c = (struct commit *) o;
 116        n = c->util;
 117        if (!n)
 118                return "undefined";
 119
 120        if (!n->generation)
 121                return n->tip_name;
 122
 123        snprintf(buffer, sizeof(buffer), "%s~%d", n->tip_name, n->generation);
 124
 125        return buffer;
 126}
 127
 128int cmd_name_rev(int argc, const char **argv, const char *prefix)
 129{
 130        struct object_array revs = { 0, 0, NULL };
 131        int as_is = 0, all = 0, transform_stdin = 0;
 132        int tags_only = 0;
 133
 134        git_config(git_default_config);
 135
 136        if (argc < 2)
 137                usage(name_rev_usage);
 138
 139        for (--argc, ++argv; argc; --argc, ++argv) {
 140                unsigned char sha1[20];
 141                struct object *o;
 142                struct commit *commit;
 143
 144                if (!as_is && (*argv)[0] == '-') {
 145                        if (!strcmp(*argv, "--")) {
 146                                as_is = 1;
 147                                continue;
 148                        } else if (!strcmp(*argv, "--tags")) {
 149                                tags_only = 1;
 150                                continue;
 151                        } else if (!strcmp(*argv, "--all")) {
 152                                if (argc > 1)
 153                                        die("Specify either a list, or --all, not both!");
 154                                all = 1;
 155                                cutoff = 0;
 156                                continue;
 157                        } else if (!strcmp(*argv, "--stdin")) {
 158                                if (argc > 1)
 159                                        die("Specify either a list, or --stdin, not both!");
 160                                transform_stdin = 1;
 161                                cutoff = 0;
 162                                continue;
 163                        }
 164                        usage(name_rev_usage);
 165                }
 166
 167                if (get_sha1(*argv, sha1)) {
 168                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 169                                        *argv);
 170                        continue;
 171                }
 172
 173                o = deref_tag(parse_object(sha1), *argv, 0);
 174                if (!o || o->type != OBJ_COMMIT) {
 175                        fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 176                                        *argv);
 177                        continue;
 178                }
 179
 180                commit = (struct commit *)o;
 181
 182                if (cutoff > commit->date)
 183                        cutoff = commit->date;
 184
 185                add_object_array((struct object *)commit, *argv, &revs);
 186        }
 187
 188        for_each_ref(name_ref, &tags_only);
 189
 190        if (transform_stdin) {
 191                char buffer[2048];
 192                char *p, *p_start;
 193
 194                while (!feof(stdin)) {
 195                        int forty = 0;
 196                        p = fgets(buffer, sizeof(buffer), stdin);
 197                        if (!p)
 198                                break;
 199
 200                        for (p_start = p; *p; p++) {
 201#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 202                                if (!ishex(*p))
 203                                        forty = 0;
 204                                else if (++forty == 40 &&
 205                                                !ishex(*(p+1))) {
 206                                        unsigned char sha1[40];
 207                                        const char *name = "undefined";
 208                                        char c = *(p+1);
 209
 210                                        forty = 0;
 211
 212                                        *(p+1) = 0;
 213                                        if (!get_sha1(p - 39, sha1)) {
 214                                                struct object *o =
 215                                                        lookup_object(sha1);
 216                                                if (o)
 217                                                        name = get_rev_name(o);
 218                                        }
 219                                        *(p+1) = c;
 220
 221                                        if (!strcmp(name, "undefined"))
 222                                                continue;
 223
 224                                        fwrite(p_start, p - p_start + 1, 1,
 225                                               stdout);
 226                                        printf(" (%s)", name);
 227                                        p_start = p + 1;
 228                                }
 229                        }
 230
 231                        /* flush */
 232                        if (p_start != p)
 233                                fwrite(p_start, p - p_start, 1, stdout);
 234                }
 235        } else if (all) {
 236                int i, max;
 237
 238                max = get_max_object_index();
 239                for (i = 0; i < max; i++) {
 240                        struct object * obj = get_indexed_object(i);
 241                        if (!obj)
 242                                continue;
 243                        printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
 244                }
 245        } else {
 246                int i;
 247                for (i = 0; i < revs.nr; i++)
 248                        printf("%s %s\n",
 249                                revs.objects[i].name,
 250                                get_rev_name(revs.objects[i].item));
 251        }
 252
 253        return 0;
 254}
 255