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 | --refs=<pattern>] ( --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 +
  62                                1 + decimal_length(generation) +  /* ~<n> */
  63                                1 + 2 +                           /* ^NN */
  64                                1);
  65
  66                        if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
  67                                len -= 2;
  68                        if (generation > 0)
  69                                sprintf(new_name, "%.*s~%d^%d", len, tip_name,
  70                                                generation, parent_number);
  71                        else
  72                                sprintf(new_name, "%.*s^%d", len, tip_name,
  73                                                parent_number);
  74
  75                        name_rev(parents->item, new_name,
  76                                merge_traversals + 1 , 0, 0);
  77                } else {
  78                        name_rev(parents->item, tip_name, merge_traversals,
  79                                generation + 1, 0);
  80                }
  81        }
  82}
  83
  84struct name_ref_data {
  85        int tags_only;
  86        const char *ref_filter;
  87};
  88
  89static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
  90{
  91        struct object *o = parse_object(sha1);
  92        struct name_ref_data *data = cb_data;
  93        int deref = 0;
  94
  95        if (data->tags_only && prefixcmp(path, "refs/tags/"))
  96                return 0;
  97
  98        if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
  99                return 0;
 100
 101        while (o && o->type == OBJ_TAG) {
 102                struct tag *t = (struct tag *) o;
 103                if (!t->tagged)
 104                        break; /* broken repository */
 105                o = parse_object(t->tagged->sha1);
 106                deref = 1;
 107        }
 108        if (o && o->type == OBJ_COMMIT) {
 109                struct commit *commit = (struct commit *)o;
 110
 111                if (!prefixcmp(path, "refs/heads/"))
 112                        path = path + 11;
 113                else if (!prefixcmp(path, "refs/"))
 114                        path = path + 5;
 115
 116                name_rev(commit, xstrdup(path), 0, 0, deref);
 117        }
 118        return 0;
 119}
 120
 121/* returns a static buffer */
 122static const char* get_rev_name(struct object *o)
 123{
 124        static char buffer[1024];
 125        struct rev_name *n;
 126        struct commit *c;
 127
 128        if (o->type != OBJ_COMMIT)
 129                return "undefined";
 130        c = (struct commit *) o;
 131        n = c->util;
 132        if (!n)
 133                return "undefined";
 134
 135        if (!n->generation)
 136                return n->tip_name;
 137        else {
 138                int len = strlen(n->tip_name);
 139                if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 140                        len -= 2;
 141                snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 142                                n->generation);
 143
 144                return buffer;
 145        }
 146}
 147
 148int cmd_name_rev(int argc, const char **argv, const char *prefix)
 149{
 150        struct object_array revs = { 0, 0, NULL };
 151        int as_is = 0, all = 0, transform_stdin = 0;
 152        struct name_ref_data data = { 0, NULL };
 153
 154        git_config(git_default_config);
 155
 156        if (argc < 2)
 157                usage(name_rev_usage);
 158
 159        for (--argc, ++argv; argc; --argc, ++argv) {
 160                unsigned char sha1[20];
 161                struct object *o;
 162                struct commit *commit;
 163
 164                if (!as_is && (*argv)[0] == '-') {
 165                        if (!strcmp(*argv, "--")) {
 166                                as_is = 1;
 167                                continue;
 168                        } else if (!strcmp(*argv, "--tags")) {
 169                                data.tags_only = 1;
 170                                continue;
 171                        } else  if (!prefixcmp(*argv, "--refs=")) {
 172                                data.ref_filter = *argv + 7;
 173                                continue;
 174                        } else if (!strcmp(*argv, "--all")) {
 175                                if (argc > 1)
 176                                        die("Specify either a list, or --all, not both!");
 177                                all = 1;
 178                                cutoff = 0;
 179                                continue;
 180                        } else if (!strcmp(*argv, "--stdin")) {
 181                                if (argc > 1)
 182                                        die("Specify either a list, or --stdin, not both!");
 183                                transform_stdin = 1;
 184                                cutoff = 0;
 185                                continue;
 186                        }
 187                        usage(name_rev_usage);
 188                }
 189
 190                if (get_sha1(*argv, sha1)) {
 191                        fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 192                                        *argv);
 193                        continue;
 194                }
 195
 196                o = deref_tag(parse_object(sha1), *argv, 0);
 197                if (!o || o->type != OBJ_COMMIT) {
 198                        fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 199                                        *argv);
 200                        continue;
 201                }
 202
 203                commit = (struct commit *)o;
 204
 205                if (cutoff > commit->date)
 206                        cutoff = commit->date;
 207
 208                add_object_array((struct object *)commit, *argv, &revs);
 209        }
 210
 211        for_each_ref(name_ref, &data);
 212
 213        if (transform_stdin) {
 214                char buffer[2048];
 215                char *p, *p_start;
 216
 217                while (!feof(stdin)) {
 218                        int forty = 0;
 219                        p = fgets(buffer, sizeof(buffer), stdin);
 220                        if (!p)
 221                                break;
 222
 223                        for (p_start = p; *p; p++) {
 224#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 225                                if (!ishex(*p))
 226                                        forty = 0;
 227                                else if (++forty == 40 &&
 228                                                !ishex(*(p+1))) {
 229                                        unsigned char sha1[40];
 230                                        const char *name = "undefined";
 231                                        char c = *(p+1);
 232
 233                                        forty = 0;
 234
 235                                        *(p+1) = 0;
 236                                        if (!get_sha1(p - 39, sha1)) {
 237                                                struct object *o =
 238                                                        lookup_object(sha1);
 239                                                if (o)
 240                                                        name = get_rev_name(o);
 241                                        }
 242                                        *(p+1) = c;
 243
 244                                        if (!strcmp(name, "undefined"))
 245                                                continue;
 246
 247                                        fwrite(p_start, p - p_start + 1, 1,
 248                                               stdout);
 249                                        printf(" (%s)", name);
 250                                        p_start = p + 1;
 251                                }
 252                        }
 253
 254                        /* flush */
 255                        if (p_start != p)
 256                                fwrite(p_start, p - p_start, 1, stdout);
 257                }
 258        } else if (all) {
 259                int i, max;
 260
 261                max = get_max_object_index();
 262                for (i = 0; i < max; i++) {
 263                        struct object * obj = get_indexed_object(i);
 264                        if (!obj)
 265                                continue;
 266                        printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
 267                }
 268        } else {
 269                int i;
 270                for (i = 0; i < revs.nr; i++)
 271                        printf("%s %s\n",
 272                                revs.objects[i].name,
 273                                get_rev_name(revs.objects[i].item));
 274        }
 275
 276        return 0;
 277}
 278