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 "revision.h"
   9
  10 /* bits #0-5 in revision.h */
  11
  12 #define COUNTED         (1u<<6)
  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         if (commit->object.flags & BOUNDARY)
  55                 putchar('-');
  56         fputs(sha1_to_hex(commit->object.sha1), stdout);
  57         if (show_parents) {
  58                 struct commit_list *parents = commit->parents;
  59                 while (parents) {
  60                         struct object *o = &(parents->item->object);
  61                         parents = parents->next;
  62                         if (o->flags & TMP_MARK)
  63                                 continue;
  64                         printf(" %s", sha1_to_hex(o->sha1));
  65                         o->flags |= TMP_MARK;
  66                 }
  67                 /* TMP_MARK is a general purpose flag that can
  68                  * be used locally, but the user should clean
  69                  * things up after it is done with them.
  70                  */
  71                 for (parents = commit->parents;
  72                      parents;
  73                      parents = parents->next)
  74                         parents->item->object.flags &= ~TMP_MARK;
  75         }
  76         if (commit_format == CMIT_FMT_ONELINE)
  77                 putchar(' ');
  78         else
  79                 putchar('\n');
  80
  81         if (verbose_header) {
  82                 static char pretty_header[16384];
  83                 pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
  84                 printf("%s%c", pretty_header, hdr_termination);
  85         }
  86         fflush(stdout);
  87 }
  88
  89 static struct object_list **process_blob(struct blob *blob,
  90                                          struct object_list **p,
  91                                          struct name_path *path,
  92                                          const char *name)
  93 {
  94         struct object *obj = &blob->object;
  95
  96         if (!revs.blob_objects)
  97                 return p;
  98         if (obj->flags & (UNINTERESTING | SEEN))
  99                 return p;
 100         obj->flags |= SEEN;
 101         return add_object(obj, p, path, name);
 102 }
 103
 104 static struct object_list **process_tree(struct tree *tree,
 105                                          struct object_list **p,
 106                                          struct name_path *path,
 107                                          const char *name)
 108 {
 109         struct object *obj = &tree->object;
 110         struct tree_entry_list *entry;
 111         struct name_path me;
 112
 113         if (!revs.tree_objects)
 114                 return p;
 115         if (obj->flags & (UNINTERESTING | SEEN))
 116                 return p;
 117         if (parse_tree(tree) < 0)
 118                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 119         obj->flags |= SEEN;
 120         p = add_object(obj, p, path, name);
 121         me.up = path;
 122         me.elem = name;
 123         me.elem_len = strlen(name);
 124         entry = tree->entries;
 125         tree->entries = NULL;
 126         while (entry) {
 127                 struct tree_entry_list *next = entry->next;
 128                 if (entry->directory)
 129                         p = process_tree(entry->item.tree, p, &me, entry->name);
 130                 else
 131                         p = process_blob(entry->item.blob, p, &me, entry->name);
 132                 free(entry);
 133                 entry = next;
 134         }
 135         return p;
 136 }
 137
 138 static void show_commit_list(struct rev_info *revs)
 139 {
 140         struct commit *commit;
 141         struct object_list *objects = NULL, **p = &objects, *pending;
 142
 143         while ((commit = get_revision(revs)) != NULL) {
 144                 p = process_tree(commit->tree, p, NULL, "");
 145                 show_commit(commit);
 146         }
 147         for (pending = revs->pending_objects; pending; pending = pending->next) {
 148                 struct object *obj = pending->item;
 149                 const char *name = pending->name;
 150                 if (obj->flags & (UNINTERESTING | SEEN))
 151                         continue;
 152                 if (obj->type == tag_type) {
 153                         obj->flags |= SEEN;
 154                         p = add_object(obj, p, NULL, name);
 155                         continue;
 156                 }
 157                 if (obj->type == tree_type) {
 158                         p = process_tree((struct tree *)obj, p, NULL, name);
 159                         continue;
 160                 }
 161                 if (obj->type == blob_type) {
 162                         p = process_blob((struct blob *)obj, p, NULL, name);
 163                         continue;
 164                 }
 165                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 166         }
 167         while (objects) {
 168                 /* An object with name "foo\n0000000..." can be used to
 169                  * confuse downstream git-pack-objects very badly.
 170                  */
 171                 const char *ep = strchr(objects->name, '\n');
 172                 if (ep) {
 173                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 174                                (int) (ep - objects->name),
 175                                objects->name);
 176                 }
 177                 else
 178                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 179                 objects = objects->next;
 180         }
 181 }
 182
 183 /*
 184  * This is a truly stupid algorithm, but it's only
 185  * used for bisection, and we just don't care enough.
 186  *
 187  * We care just barely enough to avoid recursing for
 188  * non-merge entries.
 189  */
 190 static int count_distance(struct commit_list *entry)
 191 {
 192         int nr = 0;
 193
 194         while (entry) {
 195                 struct commit *commit = entry->item;
 196                 struct commit_list *p;
 197
 198                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 199                         break;
 200                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 201                         nr++;
 202                 commit->object.flags |= COUNTED;
 203                 p = commit->parents;
 204                 entry = p;
 205                 if (p) {
 206                         p = p->next;
 207                         while (p) {
 208                                 nr += count_distance(p);
 209                                 p = p->next;
 210                         }
 211                 }
 212         }
 213
 214         return nr;
 215 }
 216
 217 static void clear_distance(struct commit_list *list)
 218 {
 219         while (list) {
 220                 struct commit *commit = list->item;
 221                 commit->object.flags &= ~COUNTED;
 222                 list = list->next;
 223         }
 224 }
 225
 226 static struct commit_list *find_bisection(struct commit_list *list)
 227 {
 228         int nr, closest;
 229         struct commit_list *p, *best;
 230
 231         nr = 0;
 232         p = list;
 233         while (p) {
 234                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 235                         nr++;
 236                 p = p->next;
 237         }
 238         closest = 0;
 239         best = list;
 240
 241         for (p = list; p; p = p->next) {
 242                 int distance;
 243
 244                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 245                         continue;
 246
 247                 distance = count_distance(p);
 248                 clear_distance(list);
 249                 if (nr - distance < distance)
 250                         distance = nr - distance;
 251                 if (distance > closest) {
 252                         best = p;
 253                         closest = distance;
 254                 }
 255         }
 256         if (best)
 257                 best->next = NULL;
 258         return best;
 259 }
 260
 261 static void mark_edge_parents_uninteresting(struct commit *commit)
 262 {
 263         struct commit_list *parents;
 264
 265         for (parents = commit->parents; parents; parents = parents->next) {
 266                 struct commit *parent = parents->item;
 267                 if (!(parent->object.flags & UNINTERESTING))
 268                         continue;
 269                 mark_tree_uninteresting(parent->tree);
 270                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 271                         parent->object.flags |= SHOWN;
 272                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 273                 }
 274         }
 275 }
 276
 277 static void mark_edges_uninteresting(struct commit_list *list)
 278 {
 279         for ( ; list; list = list->next) {
 280                 struct commit *commit = list->item;
 281
 282                 if (commit->object.flags & UNINTERESTING) {
 283                         mark_tree_uninteresting(commit->tree);
 284                         continue;
 285                 }
 286                 mark_edge_parents_uninteresting(commit);
 287         }
 288 }
 289
 290 int main(int argc, const char **argv)
 291 {
 292         struct commit_list *list;
 293         int i;
 294
 295         argc = setup_revisions(argc, argv, &revs, NULL);
 296
 297         for (i = 1 ; i < argc; i++) {
 298                 const char *arg = argv[i];
 299
 300                 /* accept -<digit>, like traditilnal "head" */
 301                 if ((*arg == '-') && isdigit(arg[1])) {
 302                         revs.max_count = atoi(arg + 1);
 303                         continue;
 304                 }
 305                 if (!strcmp(arg, "-n")) {
 306                         if (++i >= argc)
 307                                 die("-n requires an argument");
 308                         revs.max_count = atoi(argv[i]);
 309                         continue;
 310                 }
 311                 if (!strncmp(arg,"-n",2)) {
 312                         revs.max_count = atoi(arg + 2);
 313                         continue;
 314                 }
 315                 if (!strcmp(arg, "--header")) {
 316                         verbose_header = 1;
 317                         continue;
 318                 }
 319                 if (!strcmp(arg, "--no-abbrev")) {
 320                         abbrev = 0;
 321                         continue;
 322                 }
 323                 if (!strncmp(arg, "--abbrev=", 9)) {
 324                         abbrev = strtoul(arg + 9, NULL, 10);
 325                         if (abbrev && abbrev < MINIMUM_ABBREV)
 326                                 abbrev = MINIMUM_ABBREV;
 327                         else if (40 < abbrev)
 328                                 abbrev = 40;
 329                         continue;
 330                 }
 331                 if (!strncmp(arg, "--pretty", 8)) {
 332                         commit_format = get_commit_format(arg+8);
 333                         verbose_header = 1;
 334                         hdr_termination = '\n';
 335                         if (commit_format == CMIT_FMT_ONELINE)
 336                                 commit_prefix = "";
 337                         else
 338                                 commit_prefix = "commit ";
 339                         continue;
 340                 }
 341                 if (!strcmp(arg, "--parents")) {
 342                         show_parents = 1;
 343                         continue;
 344                 }
 345                 if (!strcmp(arg, "--timestamp")) {
 346                         show_timestamp = 1;
 347                         continue;
 348                 }
 349                 if (!strcmp(arg, "--bisect")) {
 350                         bisect_list = 1;
 351                         continue;
 352                 }
 353                 usage(rev_list_usage);
 354
 355         }
 356
 357         list = revs.commits;
 358
 359         if (!list &&
 360             (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) && !revs.pending_objects))
 361                 usage(rev_list_usage);
 362
 363         save_commit_buffer = verbose_header;
 364         track_object_refs = 0;
 365
 366         prepare_revision_walk(&revs);
 367         if (revs.tree_objects)
 368                 mark_edges_uninteresting(revs.commits);
 369
 370         if (bisect_list)
 371                 revs.commits = find_bisection(revs.commits);
 372
 373         show_commit_list(&revs);
 374
 375         return 0;
 376 }