builtin-rev-list.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "tag.h"
   4 #include "commit.h"
   5 #include "tree.h"
   6 #include "blob.h"
   7 #include "tree-walk.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "builtin.h"
  11
  12 /* bits #0-15 in revision.h */
  13
  14 #define COUNTED         (1u<<16)
  15
  16 static const char rev_list_usage[] =
  17 "git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  18 "  limiting output:\n"
  19 "    --max-count=nr\n"
  20 "    --max-age=epoch\n"
  21 "    --min-age=epoch\n"
  22 "    --sparse\n"
  23 "    --no-merges\n"
  24 "    --remove-empty\n"
  25 "    --all\n"
  26 "  ordering output:\n"
  27 "    --topo-order\n"
  28 "    --date-order\n"
  29 "  formatting output:\n"
  30 "    --parents\n"
  31 "    --objects | --objects-edge\n"
  32 "    --unpacked\n"
  33 "    --header | --pretty\n"
  34 "    --abbrev=nr | --no-abbrev\n"
  35 "    --abbrev-commit\n"
  36 "  special purpose:\n"
  37 "    --bisect"
  38 ;
  39
  40 static struct rev_info revs;
  41
  42 static int bisect_list = 0;
  43 static int show_timestamp = 0;
  44 static int hdr_termination = 0;
  45 static const char *header_prefix;
  46
  47 static void show_commit(struct commit *commit)
  48 {
  49         if (show_timestamp)
  50                 printf("%lu ", commit->date);
  51         if (header_prefix)
  52                 fputs(header_prefix, stdout);
  53         if (commit->object.flags & BOUNDARY)
  54                 putchar('-');
  55         if (revs.abbrev_commit && revs.abbrev)
  56                 fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
  57                       stdout);
  58         else
  59                 fputs(sha1_to_hex(commit->object.sha1), stdout);
  60         if (revs.parents) {
  61                 struct commit_list *parents = commit->parents;
  62                 while (parents) {
  63                         struct object *o = &(parents->item->object);
  64                         parents = parents->next;
  65                         if (o->flags & TMP_MARK)
  66                                 continue;
  67                         printf(" %s", sha1_to_hex(o->sha1));
  68                         o->flags |= TMP_MARK;
  69                 }
  70                 /* TMP_MARK is a general purpose flag that can
  71                  * be used locally, but the user should clean
  72                  * things up after it is done with them.
  73                  */
  74                 for (parents = commit->parents;
  75                      parents;
  76                      parents = parents->next)
  77                         parents->item->object.flags &= ~TMP_MARK;
  78         }
  79         if (revs.commit_format == CMIT_FMT_ONELINE)
  80                 putchar(' ');
  81         else
  82                 putchar('\n');
  83
  84         if (revs.verbose_header) {
  85                 static char pretty_header[16384];
  86                 pretty_print_commit(revs.commit_format, commit, ~0,
  87                                     pretty_header, sizeof(pretty_header),
  88                                     revs.abbrev, NULL, NULL);
  89                 printf("%s%c", pretty_header, hdr_termination);
  90         }
  91         fflush(stdout);
  92         if (commit->parents) {
  93                 free_commit_list(commit->parents);
  94                 commit->parents = NULL;
  95         }
  96         if (commit->buffer) {
  97                 free(commit->buffer);
  98                 commit->buffer = NULL;
  99         }
 100 }
 101
 102 static void process_blob(struct blob *blob,
 103                          struct object_array *p,
 104                          struct name_path *path,
 105                          const char *name)
 106 {
 107         struct object *obj = &blob->object;
 108
 109         if (!revs.blob_objects)
 110                 return;
 111         if (obj->flags & (UNINTERESTING | SEEN))
 112                 return;
 113         obj->flags |= SEEN;
 114         name = strdup(name);
 115         add_object(obj, p, path, name);
 116 }
 117
 118 static void process_tree(struct tree *tree,
 119                          struct object_array *p,
 120                          struct name_path *path,
 121                          const char *name)
 122 {
 123         struct object *obj = &tree->object;
 124         struct tree_desc desc;
 125         struct name_entry entry;
 126         struct name_path me;
 127
 128         if (!revs.tree_objects)
 129                 return;
 130         if (obj->flags & (UNINTERESTING | SEEN))
 131                 return;
 132         if (parse_tree(tree) < 0)
 133                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 134         obj->flags |= SEEN;
 135         name = strdup(name);
 136         add_object(obj, p, path, name);
 137         me.up = path;
 138         me.elem = name;
 139         me.elem_len = strlen(name);
 140
 141         desc.buf = tree->buffer;
 142         desc.size = tree->size;
 143
 144         while (tree_entry(&desc, &entry)) {
 145                 if (S_ISDIR(entry.mode))
 146                         process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
 147                 else
 148                         process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
 149         }
 150         free(tree->buffer);
 151         tree->buffer = NULL;
 152 }
 153
 154 static void show_commit_list(struct rev_info *revs)
 155 {
 156         int i;
 157         struct commit *commit;
 158         struct object_array objects = { 0, 0, NULL };
 159
 160         while ((commit = get_revision(revs)) != NULL) {
 161                 process_tree(commit->tree, &objects, NULL, "");
 162                 show_commit(commit);
 163         }
 164         for (i = 0; i < revs->pending.nr; i++) {
 165                 struct object_array_entry *pending = revs->pending.objects + i;
 166                 struct object *obj = pending->item;
 167                 const char *name = pending->name;
 168                 if (obj->flags & (UNINTERESTING | SEEN))
 169                         continue;
 170                 if (obj->type == OBJ_TAG) {
 171                         obj->flags |= SEEN;
 172                         add_object_array(obj, name, &objects);
 173                         continue;
 174                 }
 175                 if (obj->type == OBJ_TREE) {
 176                         process_tree((struct tree *)obj, &objects, NULL, name);
 177                         continue;
 178                 }
 179                 if (obj->type == OBJ_BLOB) {
 180                         process_blob((struct blob *)obj, &objects, NULL, name);
 181                         continue;
 182                 }
 183                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 184         }
 185         for (i = 0; i < objects.nr; i++) {
 186                 struct object_array_entry *p = objects.objects + i;
 187
 188                 /* An object with name "foo\n0000000..." can be used to
 189                  * confuse downstream git-pack-objects very badly.
 190                  */
 191                 const char *ep = strchr(p->name, '\n');
 192                 if (ep) {
 193                         printf("%s %.*s\n", sha1_to_hex(p->item->sha1),
 194                                (int) (ep - p->name),
 195                                p->name);
 196                 }
 197                 else
 198                         printf("%s %s\n", sha1_to_hex(p->item->sha1), p->name);
 199         }
 200 }
 201
 202 /*
 203  * This is a truly stupid algorithm, but it's only
 204  * used for bisection, and we just don't care enough.
 205  *
 206  * We care just barely enough to avoid recursing for
 207  * non-merge entries.
 208  */
 209 static int count_distance(struct commit_list *entry)
 210 {
 211         int nr = 0;
 212
 213         while (entry) {
 214                 struct commit *commit = entry->item;
 215                 struct commit_list *p;
 216
 217                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 218                         break;
 219                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 220                         nr++;
 221                 commit->object.flags |= COUNTED;
 222                 p = commit->parents;
 223                 entry = p;
 224                 if (p) {
 225                         p = p->next;
 226                         while (p) {
 227                                 nr += count_distance(p);
 228                                 p = p->next;
 229                         }
 230                 }
 231         }
 232
 233         return nr;
 234 }
 235
 236 static void clear_distance(struct commit_list *list)
 237 {
 238         while (list) {
 239                 struct commit *commit = list->item;
 240                 commit->object.flags &= ~COUNTED;
 241                 list = list->next;
 242         }
 243 }
 244
 245 static struct commit_list *find_bisection(struct commit_list *list)
 246 {
 247         int nr, closest;
 248         struct commit_list *p, *best;
 249
 250         nr = 0;
 251         p = list;
 252         while (p) {
 253                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 254                         nr++;
 255                 p = p->next;
 256         }
 257         closest = 0;
 258         best = list;
 259
 260         for (p = list; p; p = p->next) {
 261                 int distance;
 262
 263                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 264                         continue;
 265
 266                 distance = count_distance(p);
 267                 clear_distance(list);
 268                 if (nr - distance < distance)
 269                         distance = nr - distance;
 270                 if (distance > closest) {
 271                         best = p;
 272                         closest = distance;
 273                 }
 274         }
 275         if (best)
 276                 best->next = NULL;
 277         return best;
 278 }
 279
 280 static void mark_edge_parents_uninteresting(struct commit *commit)
 281 {
 282         struct commit_list *parents;
 283
 284         for (parents = commit->parents; parents; parents = parents->next) {
 285                 struct commit *parent = parents->item;
 286                 if (!(parent->object.flags & UNINTERESTING))
 287                         continue;
 288                 mark_tree_uninteresting(parent->tree);
 289                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 290                         parent->object.flags |= SHOWN;
 291                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 292                 }
 293         }
 294 }
 295
 296 static void mark_edges_uninteresting(struct commit_list *list)
 297 {
 298         for ( ; list; list = list->next) {
 299                 struct commit *commit = list->item;
 300
 301                 if (commit->object.flags & UNINTERESTING) {
 302                         mark_tree_uninteresting(commit->tree);
 303                         continue;
 304                 }
 305                 mark_edge_parents_uninteresting(commit);
 306         }
 307 }
 308
 309 int cmd_rev_list(int argc, const char **argv, char **envp)
 310 {
 311         struct commit_list *list;
 312         int i;
 313
 314         init_revisions(&revs);
 315         revs.abbrev = 0;
 316         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 317         argc = setup_revisions(argc, argv, &revs, NULL);
 318
 319         for (i = 1 ; i < argc; i++) {
 320                 const char *arg = argv[i];
 321
 322                 if (!strcmp(arg, "--header")) {
 323                         revs.verbose_header = 1;
 324                         continue;
 325                 }
 326                 if (!strcmp(arg, "--timestamp")) {
 327                         show_timestamp = 1;
 328                         continue;
 329                 }
 330                 if (!strcmp(arg, "--bisect")) {
 331                         bisect_list = 1;
 332                         continue;
 333                 }
 334                 usage(rev_list_usage);
 335
 336         }
 337         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 338                 /* The command line has a --pretty  */
 339                 hdr_termination = '\n';
 340                 if (revs.commit_format == CMIT_FMT_ONELINE)
 341                         header_prefix = "";
 342                 else
 343                         header_prefix = "commit ";
 344         }
 345         else if (revs.verbose_header)
 346                 /* Only --header was specified */
 347                 revs.commit_format = CMIT_FMT_RAW;
 348
 349         list = revs.commits;
 350
 351         if ((!list &&
 352              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 353               !revs.pending.nr)) ||
 354             revs.diff)
 355                 usage(rev_list_usage);
 356
 357         save_commit_buffer = revs.verbose_header;
 358         track_object_refs = 0;
 359         if (bisect_list)
 360                 revs.limited = 1;
 361
 362         prepare_revision_walk(&revs);
 363         if (revs.tree_objects)
 364                 mark_edges_uninteresting(revs.commits);
 365
 366         if (bisect_list)
 367                 revs.commits = find_bisection(revs.commits);
 368
 369         show_commit_list(&revs);
 370
 371         return 0;
 372 }