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 "diff.h"
   8 #include "revision.h"
   9
  10 /* bits #0-4 in revision.h */
  11
  12 #define COUNTED         (1u<<5)
  13
  14 static const char rev_list_usage[] =
  15 "git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  16 "  limiting output:\n"
  17 "    --max-count=nr\n"
  18 "    --max-age=epoch\n"
  19 "    --min-age=epoch\n"
  20 "    --sparse\n"
  21 "    --no-merges\n"
  22 "    --remove-empty\n"
  23 "    --all\n"
  24 "  ordering output:\n"
  25 "    --topo-order\n"
  26 "    --date-order\n"
  27 "  formatting output:\n"
  28 "    --parents\n"
  29 "    --objects | --objects-edge\n"
  30 "    --unpacked\n"
  31 "    --header | --pretty\n"
  32 "    --abbrev=nr | --no-abbrev\n"
  33 "  special purpose:\n"
  34 "    --bisect"
  35 ;
  36
  37 struct rev_info revs;
  38
  39 static int bisect_list = 0;
  40 static int verbose_header = 0;
  41 static int abbrev = DEFAULT_ABBREV;
  42 static int show_parents = 0;
  43 static int show_timestamp = 0;
  44 static int hdr_termination = 0;
  45 static const char *commit_prefix = "";
  46 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  47
  48 static void show_commit(struct commit *commit)
  49 {
  50         if (show_timestamp)
  51                 printf("%lu ", commit->date);
  52         if (commit_prefix[0])
  53                 fputs(commit_prefix, stdout);
  54         fputs(sha1_to_hex(commit->object.sha1), stdout);
  55         if (show_parents) {
  56                 struct commit_list *parents = commit->parents;
  57                 while (parents) {
  58                         struct object *o = &(parents->item->object);
  59                         parents = parents->next;
  60                         if (o->flags & TMP_MARK)
  61                                 continue;
  62                         printf(" %s", sha1_to_hex(o->sha1));
  63                         o->flags |= TMP_MARK;
  64                 }
  65                 /* TMP_MARK is a general purpose flag that can
  66                  * be used locally, but the user should clean
  67                  * things up after it is done with them.
  68                  */
  69                 for (parents = commit->parents;
  70                      parents;
  71                      parents = parents->next)
  72                         parents->item->object.flags &= ~TMP_MARK;
  73         }
  74         if (commit_format == CMIT_FMT_ONELINE)
  75                 putchar(' ');
  76         else
  77                 putchar('\n');
  78
  79         if (verbose_header) {
  80                 static char pretty_header[16384];
  81                 pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
  82                 printf("%s%c", pretty_header, hdr_termination);
  83         }
  84         fflush(stdout);
  85 }
  86
  87 static struct object_list **process_blob(struct blob *blob,
  88                                          struct object_list **p,
  89                                          struct name_path *path,
  90                                          const char *name)
  91 {
  92         struct object *obj = &blob->object;
  93
  94         if (!revs.blob_objects)
  95                 return p;
  96         if (obj->flags & (UNINTERESTING | SEEN))
  97                 return p;
  98         obj->flags |= SEEN;
  99         return add_object(obj, p, path, name);
 100 }
 101
 102 static struct object_list **process_tree(struct tree *tree,
 103                                          struct object_list **p,
 104                                          struct name_path *path,
 105                                          const char *name)
 106 {
 107         struct object *obj = &tree->object;
 108         struct tree_entry_list *entry;
 109         struct name_path me;
 110
 111         if (!revs.tree_objects)
 112                 return p;
 113         if (obj->flags & (UNINTERESTING | SEEN))
 114                 return p;
 115         if (parse_tree(tree) < 0)
 116                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 117         obj->flags |= SEEN;
 118         p = add_object(obj, p, path, name);
 119         me.up = path;
 120         me.elem = name;
 121         me.elem_len = strlen(name);
 122         entry = tree->entries;
 123         tree->entries = NULL;
 124         while (entry) {
 125                 struct tree_entry_list *next = entry->next;
 126                 if (entry->directory)
 127                         p = process_tree(entry->item.tree, p, &me, entry->name);
 128                 else
 129                         p = process_blob(entry->item.blob, p, &me, entry->name);
 130                 free(entry);
 131                 entry = next;
 132         }
 133         return p;
 134 }
 135
 136 static void show_commit_list(struct rev_info *revs)
 137 {
 138         struct commit *commit;
 139         struct object_list *objects = NULL, **p = &objects, *pending;
 140
 141         while ((commit = get_revision(revs)) != NULL) {
 142                 p = process_tree(commit->tree, p, NULL, "");
 143                 show_commit(commit);
 144         }
 145         for (pending = revs->pending_objects; pending; pending = pending->next) {
 146                 struct object *obj = pending->item;
 147                 const char *name = pending->name;
 148                 if (obj->flags & (UNINTERESTING | SEEN))
 149                         continue;
 150                 if (obj->type == tag_type) {
 151                         obj->flags |= SEEN;
 152                         p = add_object(obj, p, NULL, name);
 153                         continue;
 154                 }
 155                 if (obj->type == tree_type) {
 156                         p = process_tree((struct tree *)obj, p, NULL, name);
 157                         continue;
 158                 }
 159                 if (obj->type == blob_type) {
 160                         p = process_blob((struct blob *)obj, p, NULL, name);
 161                         continue;
 162                 }
 163                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 164         }
 165         while (objects) {
 166                 /* An object with name "foo\n0000000..." can be used to
 167                  * confuse downstream git-pack-objects very badly.
 168                  */
 169                 const char *ep = strchr(objects->name, '\n');
 170                 if (ep) {
 171                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 172                                (int) (ep - objects->name),
 173                                objects->name);
 174                 }
 175                 else
 176                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 177                 objects = objects->next;
 178         }
 179 }
 180
 181 /*
 182  * This is a truly stupid algorithm, but it's only
 183  * used for bisection, and we just don't care enough.
 184  *
 185  * We care just barely enough to avoid recursing for
 186  * non-merge entries.
 187  */
 188 static int count_distance(struct commit_list *entry)
 189 {
 190         int nr = 0;
 191
 192         while (entry) {
 193                 struct commit *commit = entry->item;
 194                 struct commit_list *p;
 195
 196                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 197                         break;
 198                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 199                         nr++;
 200                 commit->object.flags |= COUNTED;
 201                 p = commit->parents;
 202                 entry = p;
 203                 if (p) {
 204                         p = p->next;
 205                         while (p) {
 206                                 nr += count_distance(p);
 207                                 p = p->next;
 208                         }
 209                 }
 210         }
 211
 212         return nr;
 213 }
 214
 215 static void clear_distance(struct commit_list *list)
 216 {
 217         while (list) {
 218                 struct commit *commit = list->item;
 219                 commit->object.flags &= ~COUNTED;
 220                 list = list->next;
 221         }
 222 }
 223
 224 static struct commit_list *find_bisection(struct commit_list *list)
 225 {
 226         int nr, closest;
 227         struct commit_list *p, *best;
 228
 229         nr = 0;
 230         p = list;
 231         while (p) {
 232                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 233                         nr++;
 234                 p = p->next;
 235         }
 236         closest = 0;
 237         best = list;
 238
 239         for (p = list; p; p = p->next) {
 240                 int distance;
 241
 242                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 243                         continue;
 244
 245                 distance = count_distance(p);
 246                 clear_distance(list);
 247                 if (nr - distance < distance)
 248                         distance = nr - distance;
 249                 if (distance > closest) {
 250                         best = p;
 251                         closest = distance;
 252                 }
 253         }
 254         if (best)
 255                 best->next = NULL;
 256         return best;
 257 }
 258
 259 static void mark_edge_parents_uninteresting(struct commit *commit)
 260 {
 261         struct commit_list *parents;
 262
 263         for (parents = commit->parents; parents; parents = parents->next) {
 264                 struct commit *parent = parents->item;
 265                 if (!(parent->object.flags & UNINTERESTING))
 266                         continue;
 267                 mark_tree_uninteresting(parent->tree);
 268                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 269                         parent->object.flags |= SHOWN;
 270                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 271                 }
 272         }
 273 }
 274
 275 static void mark_edges_uninteresting(struct commit_list *list)
 276 {
 277         for ( ; list; list = list->next) {
 278                 struct commit *commit = list->item;
 279
 280                 if (commit->object.flags & UNINTERESTING) {
 281                         mark_tree_uninteresting(commit->tree);
 282                         continue;
 283                 }
 284                 mark_edge_parents_uninteresting(commit);
 285         }
 286 }
 287
 288 int main(int argc, const char **argv)
 289 {
 290         struct commit_list *list;
 291         int i;
 292
 293         argc = setup_revisions(argc, argv, &revs, NULL);
 294
 295         for (i = 1 ; i < argc; i++) {
 296                 const char *arg = argv[i];
 297
 298                 /* accept -<digit>, like traditilnal "head" */
 299                 if ((*arg == '-') && isdigit(arg[1])) {
 300                         revs.max_count = atoi(arg + 1);
 301                         continue;
 302                 }
 303                 if (!strcmp(arg, "-n")) {
 304                         if (++i >= argc)
 305                                 die("-n requires an argument");
 306                         revs.max_count = atoi(argv[i]);
 307                         continue;
 308                 }
 309                 if (!strncmp(arg,"-n",2)) {
 310                         revs.max_count = atoi(arg + 2);
 311                         continue;
 312                 }
 313                 if (!strcmp(arg, "--header")) {
 314                         verbose_header = 1;
 315                         continue;
 316                 }
 317                 if (!strcmp(arg, "--no-abbrev")) {
 318                         abbrev = 0;
 319                         continue;
 320                 }
 321                 if (!strncmp(arg, "--abbrev=", 9)) {
 322                         abbrev = strtoul(arg + 9, NULL, 10);
 323                         if (abbrev && abbrev < MINIMUM_ABBREV)
 324                                 abbrev = MINIMUM_ABBREV;
 325                         else if (40 < abbrev)
 326                                 abbrev = 40;
 327                         continue;
 328                 }
 329                 if (!strncmp(arg, "--pretty", 8)) {
 330                         commit_format = get_commit_format(arg+8);
 331                         verbose_header = 1;
 332                         hdr_termination = '\n';
 333                         if (commit_format == CMIT_FMT_ONELINE)
 334                                 commit_prefix = "";
 335                         else
 336                                 commit_prefix = "commit ";
 337                         continue;
 338                 }
 339                 if (!strcmp(arg, "--parents")) {
 340                         show_parents = 1;
 341                         continue;
 342                 }
 343                 if (!strcmp(arg, "--timestamp")) {
 344                         show_timestamp = 1;
 345                         continue;
 346                 }
 347                 if (!strcmp(arg, "--bisect")) {
 348                         bisect_list = 1;
 349                         continue;
 350                 }
 351                 usage(rev_list_usage);
 352
 353         }
 354
 355         list = revs.commits;
 356
 357         if (!list &&
 358             (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) && !revs.pending_objects))
 359                 usage(rev_list_usage);
 360
 361         prepare_revision_walk(&revs);
 362         if (revs.tree_objects)
 363                 mark_edges_uninteresting(revs.commits);
 364
 365         if (bisect_list)
 366                 revs.commits = find_bisection(revs.commits);
 367
 368         save_commit_buffer = verbose_header;
 369         track_object_refs = 0;
 370
 371         show_commit_list(&revs);
 372
 373         return 0;
 374 }