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
   7#define CUTOFF_DATE_SLOP 86400 /* one day */
   8
   9static const char name_rev_usage[] =
  10        "git-name-rev [--tags | --refs=<pattern>] ( --all | --stdin | committish [committish...] )\n";
  11
  12typedef struct rev_name {
  13        const char *tip_name;
  14        int merge_traversals;
  15        int generation;
  16} rev_name;
  17
  18static long cutoff = LONG_MAX;
  19
  20static void name_rev(struct commit *commit,
  21                const char *tip_name, int merge_traversals, int generation,
  22                int deref)
  23{
  24        struct rev_name *name = (struct rev_name *)commit->util;
  25        struct commit_list *parents;
  26        int parent_number = 1;
  27
  28        if (!commit->object.parsed)
  29                parse_commit(commit);
  30
  31        if (commit->date < cutoff)
  32                return;
  33
  34        if (deref) {
  35                char *new_name = xmalloc(strlen(tip_name)+3);
  36                strcpy(new_name, tip_name);
  37                strcat(new_name, "^0");
  38                tip_name = new_name;
  39
  40                if (generation)
  41                        die("generation: %d, but deref?", generation);
  42        }
  43
  44        if (name == NULL) {
  45                name = xmalloc(sizeof(rev_name));
  46                commit->util = name;
  47                goto copy_data;
  48        } else if (name->merge_traversals > merge_traversals ||
  49                        (name->merge_traversals == merge_traversals &&
  50                         name->generation > generation)) {
  51copy_data:
  52                name->tip_name = tip_name;
  53                name->merge_traversals = merge_traversals;
  54                name->generation = generation;
  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,
  78                                merge_traversals + 1 , 0, 0);
  79                } else {
  80                        name_rev(parents->item, tip_name, merge_traversals,
  81                                generation + 1, 0);
  82                }
  83        }
  84}
  85
  86struct name_ref_data {
  87        int tags_only;
  88        const char *ref_filter;
  89};
  90
  91static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
  92{
  93        struct object *o = parse_object(sha1);
  94        struct name_ref_data *data = cb_data;
  95        int deref = 0;
  96
  97        if (data->tags_only && prefixcmp(path, "refs/tags/"))
  98                return 0;
  99
 100        if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
 101                return 0;
 102
 103        while (o && o->type == OBJ_TAG) {
 104                struct tag *t = (struct tag *) o;
 105                if (!t->tagged)
 106                        break; /* broken repository */
 107                o = parse_object(t->tagged->sha1);
 108                deref = 1;
 109        }
 110        if (o && o->type == OBJ_COMMIT) {
 111                struct commit *commit = (struct commit *)o;
 112
 113                if (!prefixcmp(path, "refs/heads/"))
 114                        path = path + 11;
 115                else if (!prefixcmp(path, "refs/"))
 116                        path = path + 5;
 117
 118                name_rev(commit, xstrdup(path), 0, 0, deref);
 119        }
 120        return 0;
 121}
 122
 123/* returns a static buffer */
 124static const char* get_rev_name(struct object *o)
 125{
 126        static char buffer[1024];
 127        struct rev_name *n;
 128        struct commit *c;
 129
 130        if (o->type != OBJ_COMMIT)
 131                return "undefined";
 132        c = (struct commit *) o;
 133        n = c->util;
 134        if (!n)
 135                return "undefined";
 136
 137        if (!n->generation)
 138                return n->tip_name;
 139        else {
 140                int len = strlen(n->tip_name);
 141                if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 142                        len -= 2;
 143                snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 144                                n->generation);
 145
 146                return buffer;
 147        }
 148}
 149
 150int cmd_name_rev(int argc, const char **argv, const char *prefix)
 151{
 152        struct object_array revs = { 0, 0, NULL };
 153        int as_is = 0, all = 0, transform_stdin = 0;
 154        struct name_ref_data data = { 0, NULL };
 155
 156        git_config(git_default_config);
 157
 158        if (argc < 2)
 159                usage(name_rev_usage);
 160
 161        for (--argc, ++argv; argc; --argc, ++argv) {
 162                unsigned char sha1[20];
 163                struct object *o;
 164                struct commit *commit;
 165
 166                if (!as_is && (*argv)[0] == '-') {
 167                        if (!strcmp(*argv, "--")) {
 168                                as_is = 1;
 169                                continue;
 170                        } else if (!strcmp(*argv, "--tags")) {
 171                                data.tags_only = 1;
 172                                continue;
 173                        } else  if (!prefixcmp(*argv, "--refs=")) {
 174                                data.ref_filter = *argv + 7;
 175                                continue;
 176                        } else if (!strcmp(*argv, "--all")) {
 177                                if (argc > 1)
 178                                        die("Specify either a list, or --all, not both!");
 179                                all = 1;
 180                                cutoff = 0;
 181                                continue;
 182                        } else if (!strcmp(*argv, "--stdin")) {
 183                                if (argc > 1)
 184                                        die("Specify either a list, or --stdin, not both!");
 185                                transform_stdin = 1;
 186                                cutoff = 0;
 187                                continue;
 188                        }
 189                        usage(name_rev_usage);
 190                }
 191
 192                if (get_sha1(*argv, sha1)) {
 193                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 194                                        *argv);
 195                        continue;
 196                }
 197
 198                o = deref_tag(parse_object(sha1), *argv, 0);
 199                if (!o || o->type != OBJ_COMMIT) {
 200                        fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 201                                        *argv);
 202                        continue;
 203                }
 204
 205                commit = (struct commit *)o;
 206
 207                if (cutoff > commit->date)
 208                        cutoff = commit->date;
 209
 210                add_object_array((struct object *)commit, *argv, &revs);
 211        }
 212
 213        if (cutoff)
 214                cutoff = cutoff - CUTOFF_DATE_SLOP;
 215        for_each_ref(name_ref, &data);
 216
 217        if (transform_stdin) {
 218                char buffer[2048];
 219                char *p, *p_start;
 220
 221                while (!feof(stdin)) {
 222                        int forty = 0;
 223                        p = fgets(buffer, sizeof(buffer), stdin);
 224                        if (!p)
 225                                break;
 226
 227                        for (p_start = p; *p; p++) {
 228#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 229                                if (!ishex(*p))
 230                                        forty = 0;
 231                                else if (++forty == 40 &&
 232                                                !ishex(*(p+1))) {
 233                                        unsigned char sha1[40];
 234                                        const char *name = "undefined";
 235                                        char c = *(p+1);
 236
 237                                        forty = 0;
 238
 239                                        *(p+1) = 0;
 240                                        if (!get_sha1(p - 39, sha1)) {
 241                                                struct object *o =
 242                                                        lookup_object(sha1);
 243                                                if (o)
 244                                                        name = get_rev_name(o);
 245                                        }
 246                                        *(p+1) = c;
 247
 248                                        if (!strcmp(name, "undefined"))
 249                                                continue;
 250
 251                                        fwrite(p_start, p - p_start + 1, 1,
 252                                               stdout);
 253                                        printf(" (%s)", name);
 254                                        p_start = p + 1;
 255                                }
 256                        }
 257
 258                        /* flush */
 259                        if (p_start != p)
 260                                fwrite(p_start, p - p_start, 1, stdout);
 261                }
 262        } else if (all) {
 263                int i, max;
 264
 265                max = get_max_object_index();
 266                for (i = 0; i < max; i++) {
 267                        struct object * obj = get_indexed_object(i);
 268                        if (!obj)
 269                                continue;
 270                        printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
 271                }
 272        } else {
 273                int i;
 274                for (i = 0; i < revs.nr; i++)
 275                        printf("%s %s\n",
 276                                revs.objects[i].name,
 277                                get_rev_name(revs.objects[i].item));
 278        }
 279
 280        return 0;
 281}
 282