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
   9 static const char name_rev_usage[] =
  10         "git-name-rev [--tags | --refs=<pattern>] ( --all | --stdin | committish [committish...] )\n";
  11
  12 typedef struct rev_name {
  13         const char *tip_name;
  14         int generation;
  15         int distance;
  16 } rev_name;
  17
  18 static long cutoff = LONG_MAX;
  19
  20 /* How many generations are maximally preferred over _one_ merge traversal? */
  21 #define MERGE_TRAVERSAL_WEIGHT 65535
  22
  23 static void name_rev(struct commit *commit,
  24                 const char *tip_name, int generation, int distance,
  25                 int deref)
  26 {
  27         struct rev_name *name = (struct rev_name *)commit->util;
  28         struct commit_list *parents;
  29         int parent_number = 1;
  30
  31         if (!commit->object.parsed)
  32                 parse_commit(commit);
  33
  34         if (commit->date < cutoff)
  35                 return;
  36
  37         if (deref) {
  38                 char *new_name = xmalloc(strlen(tip_name)+3);
  39                 strcpy(new_name, tip_name);
  40                 strcat(new_name, "^0");
  41                 tip_name = new_name;
  42
  43                 if (generation)
  44                         die("generation: %d, but deref?", generation);
  45         }
  46
  47         if (name == NULL) {
  48                 name = xmalloc(sizeof(rev_name));
  49                 commit->util = name;
  50                 goto copy_data;
  51         } else if (name->distance > distance) {
  52 copy_data:
  53                 name->tip_name = tip_name;
  54                 name->generation = generation;
  55                 name->distance = distance;
  56         } else
  57                 return;
  58
  59         for (parents = commit->parents;
  60                         parents;
  61                         parents = parents->next, parent_number++) {
  62                 if (parent_number > 1) {
  63                         int len = strlen(tip_name);
  64                         char *new_name = xmalloc(len +
  65                                 1 + decimal_length(generation) +  /* ~<n> */
  66                                 1 + 2 +                           /* ^NN */
  67                                 1);
  68
  69                         if (len > 2 && !strcmp(tip_name + len - 2, "^0"))
  70                                 len -= 2;
  71                         if (generation > 0)
  72                                 sprintf(new_name, "%.*s~%d^%d", len, tip_name,
  73                                                 generation, parent_number);
  74                         else
  75                                 sprintf(new_name, "%.*s^%d", len, tip_name,
  76                                                 parent_number);
  77
  78                         name_rev(parents->item, new_name, 0,
  79                                 distance + MERGE_TRAVERSAL_WEIGHT, 0);
  80                 } else {
  81                         name_rev(parents->item, tip_name, generation + 1,
  82                                 distance + 1, 0);
  83                 }
  84         }
  85 }
  86
  87 struct name_ref_data {
  88         int tags_only;
  89         int name_only;
  90         const char *ref_filter;
  91 };
  92
  93 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
  94 {
  95         struct object *o = parse_object(sha1);
  96         struct name_ref_data *data = cb_data;
  97         int deref = 0;
  98
  99         if (data->tags_only && prefixcmp(path, "refs/tags/"))
 100                 return 0;
 101
 102         if (data->ref_filter && fnmatch(data->ref_filter, path, 0))
 103                 return 0;
 104
 105         while (o && o->type == OBJ_TAG) {
 106                 struct tag *t = (struct tag *) o;
 107                 if (!t->tagged)
 108                         break; /* broken repository */
 109                 o = parse_object(t->tagged->sha1);
 110                 deref = 1;
 111         }
 112         if (o && o->type == OBJ_COMMIT) {
 113                 struct commit *commit = (struct commit *)o;
 114
 115                 if (!prefixcmp(path, "refs/heads/"))
 116                         path = path + 11;
 117                 else if (data->tags_only
 118                     && data->name_only
 119                     && !prefixcmp(path, "refs/tags/"))
 120                         path = path + 10;
 121                 else if (!prefixcmp(path, "refs/"))
 122                         path = path + 5;
 123
 124                 name_rev(commit, xstrdup(path), 0, 0, deref);
 125         }
 126         return 0;
 127 }
 128
 129 /* returns a static buffer */
 130 static const char* get_rev_name(struct object *o)
 131 {
 132         static char buffer[1024];
 133         struct rev_name *n;
 134         struct commit *c;
 135
 136         if (o->type != OBJ_COMMIT)
 137                 return "undefined";
 138         c = (struct commit *) o;
 139         n = c->util;
 140         if (!n)
 141                 return "undefined";
 142
 143         if (!n->generation)
 144                 return n->tip_name;
 145         else {
 146                 int len = strlen(n->tip_name);
 147                 if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
 148                         len -= 2;
 149                 snprintf(buffer, sizeof(buffer), "%.*s~%d", len, n->tip_name,
 150                                 n->generation);
 151
 152                 return buffer;
 153         }
 154 }
 155
 156 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 157 {
 158         struct object_array revs = { 0, 0, NULL };
 159         int as_is = 0, all = 0, transform_stdin = 0;
 160         struct name_ref_data data = { 0, 0, NULL };
 161
 162         git_config(git_default_config);
 163
 164         if (argc < 2)
 165                 usage(name_rev_usage);
 166
 167         for (--argc, ++argv; argc; --argc, ++argv) {
 168                 unsigned char sha1[20];
 169                 struct object *o;
 170                 struct commit *commit;
 171
 172                 if (!as_is && (*argv)[0] == '-') {
 173                         if (!strcmp(*argv, "--")) {
 174                                 as_is = 1;
 175                                 continue;
 176                         } else if (!strcmp(*argv, "--name-only")) {
 177                                 data.name_only = 1;
 178                                 continue;
 179                         } else if (!strcmp(*argv, "--tags")) {
 180                                 data.tags_only = 1;
 181                                 continue;
 182                         } else  if (!prefixcmp(*argv, "--refs=")) {
 183                                 data.ref_filter = *argv + 7;
 184                                 continue;
 185                         } else if (!strcmp(*argv, "--all")) {
 186                                 if (argc > 1)
 187                                         die("Specify either a list, or --all, not both!");
 188                                 all = 1;
 189                                 cutoff = 0;
 190                                 continue;
 191                         } else if (!strcmp(*argv, "--stdin")) {
 192                                 if (argc > 1)
 193                                         die("Specify either a list, or --stdin, not both!");
 194                                 transform_stdin = 1;
 195                                 cutoff = 0;
 196                                 continue;
 197                         }
 198                         usage(name_rev_usage);
 199                 }
 200
 201                 if (get_sha1(*argv, sha1)) {
 202                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 203                                         *argv);
 204                         continue;
 205                 }
 206
 207                 o = deref_tag(parse_object(sha1), *argv, 0);
 208                 if (!o || o->type != OBJ_COMMIT) {
 209                         fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 210                                         *argv);
 211                         continue;
 212                 }
 213
 214                 commit = (struct commit *)o;
 215
 216                 if (cutoff > commit->date)
 217                         cutoff = commit->date;
 218
 219                 add_object_array((struct object *)commit, *argv, &revs);
 220         }
 221
 222         if (cutoff)
 223                 cutoff = cutoff - CUTOFF_DATE_SLOP;
 224         for_each_ref(name_ref, &data);
 225
 226         if (transform_stdin) {
 227                 char buffer[2048];
 228                 char *p, *p_start;
 229
 230                 while (!feof(stdin)) {
 231                         int forty = 0;
 232                         p = fgets(buffer, sizeof(buffer), stdin);
 233                         if (!p)
 234                                 break;
 235
 236                         for (p_start = p; *p; p++) {
 237 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 238                                 if (!ishex(*p))
 239                                         forty = 0;
 240                                 else if (++forty == 40 &&
 241                                                 !ishex(*(p+1))) {
 242                                         unsigned char sha1[40];
 243                                         const char *name = "undefined";
 244                                         char c = *(p+1);
 245
 246                                         forty = 0;
 247
 248                                         *(p+1) = 0;
 249                                         if (!get_sha1(p - 39, sha1)) {
 250                                                 struct object *o =
 251                                                         lookup_object(sha1);
 252                                                 if (o)
 253                                                         name = get_rev_name(o);
 254                                         }
 255                                         *(p+1) = c;
 256
 257                                         if (!strcmp(name, "undefined"))
 258                                                 continue;
 259
 260                                         fwrite(p_start, p - p_start + 1, 1,
 261                                                stdout);
 262                                         printf(" (%s)", name);
 263                                         p_start = p + 1;
 264                                 }
 265                         }
 266
 267                         /* flush */
 268                         if (p_start != p)
 269                                 fwrite(p_start, p - p_start, 1, stdout);
 270                 }
 271         } else if (all) {
 272                 int i, max;
 273
 274                 max = get_max_object_index();
 275                 for (i = 0; i < max; i++) {
 276                         struct object * obj = get_indexed_object(i);
 277                         if (!obj)
 278                                 continue;
 279                         if (!data.name_only)
 280                                 printf("%s ", sha1_to_hex(obj->sha1));
 281                         printf("%s\n", get_rev_name(obj));
 282                 }
 283         } else {
 284                 int i;
 285                 for (i = 0; i < revs.nr; i++) {
 286                         if (!data.name_only)
 287                                 printf("%s ", revs.objects[i].name);
 288                         printf("%s\n", get_rev_name(revs.objects[i].item));
 289                 }
 290         }
 291
 292         return 0;
 293 }