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 "    --abbrev-commit\n"
  34 "  special purpose:\n"
  35 "    --bisect"
  36 ;
  37
  38 struct rev_info revs;
  39
  40 static int bisect_list = 0;
  41 static int verbose_header = 0;
  42 static int abbrev = DEFAULT_ABBREV;
  43 static int abbrev_commit = 0;
  44 static int show_timestamp = 0;
  45 static int hdr_termination = 0;
  46 static const char *commit_prefix = "";
  47 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  48
  49 static void show_commit(struct commit *commit)
  50 {
  51         if (show_timestamp)
  52                 printf("%lu ", commit->date);
  53         if (commit_prefix[0])
  54                 fputs(commit_prefix, stdout);
  55         if (commit->object.flags & BOUNDARY)
  56                 putchar('-');
  57         if (abbrev_commit && abbrev)
  58                 fputs(find_unique_abbrev(commit->object.sha1, abbrev), stdout);
  59         else
  60                 fputs(sha1_to_hex(commit->object.sha1), stdout);
  61         if (revs.parents) {
  62                 struct commit_list *parents = commit->parents;
  63                 while (parents) {
  64                         struct object *o = &(parents->item->object);
  65                         parents = parents->next;
  66                         if (o->flags & TMP_MARK)
  67                                 continue;
  68                         printf(" %s", sha1_to_hex(o->sha1));
  69                         o->flags |= TMP_MARK;
  70                 }
  71                 /* TMP_MARK is a general purpose flag that can
  72                  * be used locally, but the user should clean
  73                  * things up after it is done with them.
  74                  */
  75                 for (parents = commit->parents;
  76                      parents;
  77                      parents = parents->next)
  78                         parents->item->object.flags &= ~TMP_MARK;
  79         }
  80         if (commit_format == CMIT_FMT_ONELINE)
  81                 putchar(' ');
  82         else
  83                 putchar('\n');
  84
  85         if (verbose_header) {
  86                 static char pretty_header[16384];
  87                 pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
  88                 printf("%s%c", pretty_header, hdr_termination);
  89         }
  90         fflush(stdout);
  91 }
  92
  93 static struct object_list **process_blob(struct blob *blob,
  94                                          struct object_list **p,
  95                                          struct name_path *path,
  96                                          const char *name)
  97 {
  98         struct object *obj = &blob->object;
  99
 100         if (!revs.blob_objects)
 101                 return p;
 102         if (obj->flags & (UNINTERESTING | SEEN))
 103                 return p;
 104         obj->flags |= SEEN;
 105         return add_object(obj, p, path, name);
 106 }
 107
 108 static struct object_list **process_tree(struct tree *tree,
 109                                          struct object_list **p,
 110                                          struct name_path *path,
 111                                          const char *name)
 112 {
 113         struct object *obj = &tree->object;
 114         struct tree_entry_list *entry;
 115         struct name_path me;
 116
 117         if (!revs.tree_objects)
 118                 return p;
 119         if (obj->flags & (UNINTERESTING | SEEN))
 120                 return p;
 121         if (parse_tree(tree) < 0)
 122                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 123         obj->flags |= SEEN;
 124         p = add_object(obj, p, path, name);
 125         me.up = path;
 126         me.elem = name;
 127         me.elem_len = strlen(name);
 128         entry = tree->entries;
 129         tree->entries = NULL;
 130         while (entry) {
 131                 struct tree_entry_list *next = entry->next;
 132                 if (entry->directory)
 133                         p = process_tree(entry->item.tree, p, &me, entry->name);
 134                 else
 135                         p = process_blob(entry->item.blob, p, &me, entry->name);
 136                 free(entry);
 137                 entry = next;
 138         }
 139         return p;
 140 }
 141
 142 static void show_commit_list(struct rev_info *revs)
 143 {
 144         struct commit *commit;
 145         struct object_list *objects = NULL, **p = &objects, *pending;
 146
 147         while ((commit = get_revision(revs)) != NULL) {
 148                 p = process_tree(commit->tree, p, NULL, "");
 149                 show_commit(commit);
 150         }
 151         for (pending = revs->pending_objects; pending; pending = pending->next) {
 152                 struct object *obj = pending->item;
 153                 const char *name = pending->name;
 154                 if (obj->flags & (UNINTERESTING | SEEN))
 155                         continue;
 156                 if (obj->type == tag_type) {
 157                         obj->flags |= SEEN;
 158                         p = add_object(obj, p, NULL, name);
 159                         continue;
 160                 }
 161                 if (obj->type == tree_type) {
 162                         p = process_tree((struct tree *)obj, p, NULL, name);
 163                         continue;
 164                 }
 165                 if (obj->type == blob_type) {
 166                         p = process_blob((struct blob *)obj, p, NULL, name);
 167                         continue;
 168                 }
 169                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 170         }
 171         while (objects) {
 172                 /* An object with name "foo\n0000000..." can be used to
 173                  * confuse downstream git-pack-objects very badly.
 174                  */
 175                 const char *ep = strchr(objects->name, '\n');
 176                 if (ep) {
 177                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 178                                (int) (ep - objects->name),
 179                                objects->name);
 180                 }
 181                 else
 182                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 183                 objects = objects->next;
 184         }
 185 }
 186
 187 /*
 188  * This is a truly stupid algorithm, but it's only
 189  * used for bisection, and we just don't care enough.
 190  *
 191  * We care just barely enough to avoid recursing for
 192  * non-merge entries.
 193  */
 194 static int count_distance(struct commit_list *entry)
 195 {
 196         int nr = 0;
 197
 198         while (entry) {
 199                 struct commit *commit = entry->item;
 200                 struct commit_list *p;
 201
 202                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 203                         break;
 204                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 205                         nr++;
 206                 commit->object.flags |= COUNTED;
 207                 p = commit->parents;
 208                 entry = p;
 209                 if (p) {
 210                         p = p->next;
 211                         while (p) {
 212                                 nr += count_distance(p);
 213                                 p = p->next;
 214                         }
 215                 }
 216         }
 217
 218         return nr;
 219 }
 220
 221 static void clear_distance(struct commit_list *list)
 222 {
 223         while (list) {
 224                 struct commit *commit = list->item;
 225                 commit->object.flags &= ~COUNTED;
 226                 list = list->next;
 227         }
 228 }
 229
 230 static struct commit_list *find_bisection(struct commit_list *list)
 231 {
 232         int nr, closest;
 233         struct commit_list *p, *best;
 234
 235         nr = 0;
 236         p = list;
 237         while (p) {
 238                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 239                         nr++;
 240                 p = p->next;
 241         }
 242         closest = 0;
 243         best = list;
 244
 245         for (p = list; p; p = p->next) {
 246                 int distance;
 247
 248                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 249                         continue;
 250
 251                 distance = count_distance(p);
 252                 clear_distance(list);
 253                 if (nr - distance < distance)
 254                         distance = nr - distance;
 255                 if (distance > closest) {
 256                         best = p;
 257                         closest = distance;
 258                 }
 259         }
 260         if (best)
 261                 best->next = NULL;
 262         return best;
 263 }
 264
 265 static void mark_edge_parents_uninteresting(struct commit *commit)
 266 {
 267         struct commit_list *parents;
 268
 269         for (parents = commit->parents; parents; parents = parents->next) {
 270                 struct commit *parent = parents->item;
 271                 if (!(parent->object.flags & UNINTERESTING))
 272                         continue;
 273                 mark_tree_uninteresting(parent->tree);
 274                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 275                         parent->object.flags |= SHOWN;
 276                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 277                 }
 278         }
 279 }
 280
 281 static void mark_edges_uninteresting(struct commit_list *list)
 282 {
 283         for ( ; list; list = list->next) {
 284                 struct commit *commit = list->item;
 285
 286                 if (commit->object.flags & UNINTERESTING) {
 287                         mark_tree_uninteresting(commit->tree);
 288                         continue;
 289                 }
 290                 mark_edge_parents_uninteresting(commit);
 291         }
 292 }
 293
 294 int main(int argc, const char **argv)
 295 {
 296         struct commit_list *list;
 297         int i;
 298
 299         argc = setup_revisions(argc, argv, &revs, NULL);
 300
 301         for (i = 1 ; i < argc; i++) {
 302                 const char *arg = argv[i];
 303
 304                 /* accept -<digit>, like traditilnal "head" */
 305                 if ((*arg == '-') && isdigit(arg[1])) {
 306                         revs.max_count = atoi(arg + 1);
 307                         continue;
 308                 }
 309                 if (!strcmp(arg, "-n")) {
 310                         if (++i >= argc)
 311                                 die("-n requires an argument");
 312                         revs.max_count = atoi(argv[i]);
 313                         continue;
 314                 }
 315                 if (!strncmp(arg,"-n",2)) {
 316                         revs.max_count = atoi(arg + 2);
 317                         continue;
 318                 }
 319                 if (!strcmp(arg, "--header")) {
 320                         verbose_header = 1;
 321                         continue;
 322                 }
 323                 if (!strcmp(arg, "--no-abbrev")) {
 324                         abbrev = 0;
 325                         continue;
 326                 }
 327                 if (!strcmp(arg, "--abbrev")) {
 328                         abbrev = DEFAULT_ABBREV;
 329                         continue;
 330                 }
 331                 if (!strcmp(arg, "--abbrev-commit")) {
 332                         abbrev_commit = 1;
 333                         continue;
 334                 }
 335                 if (!strncmp(arg, "--abbrev=", 9)) {
 336                         abbrev = strtoul(arg + 9, NULL, 10);
 337                         if (abbrev && abbrev < MINIMUM_ABBREV)
 338                                 abbrev = MINIMUM_ABBREV;
 339                         else if (40 < abbrev)
 340                                 abbrev = 40;
 341                         continue;
 342                 }
 343                 if (!strncmp(arg, "--pretty", 8)) {
 344                         commit_format = get_commit_format(arg+8);
 345                         verbose_header = 1;
 346                         hdr_termination = '\n';
 347                         if (commit_format == CMIT_FMT_ONELINE)
 348                                 commit_prefix = "";
 349                         else
 350                                 commit_prefix = "commit ";
 351                         continue;
 352                 }
 353                 if (!strcmp(arg, "--timestamp")) {
 354                         show_timestamp = 1;
 355                         continue;
 356                 }
 357                 if (!strcmp(arg, "--bisect")) {
 358                         bisect_list = 1;
 359                         continue;
 360                 }
 361                 usage(rev_list_usage);
 362
 363         }
 364
 365         list = revs.commits;
 366
 367         if (!list &&
 368             (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) && !revs.pending_objects))
 369                 usage(rev_list_usage);
 370
 371         save_commit_buffer = verbose_header;
 372         track_object_refs = 0;
 373
 374         prepare_revision_walk(&revs);
 375         if (revs.tree_objects)
 376                 mark_edges_uninteresting(revs.commits);
 377
 378         if (bisect_list)
 379                 revs.commits = find_bisection(revs.commits);
 380
 381         show_commit_list(&revs);
 382
 383         return 0;
 384 }