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
  11 /* bits #0-15 in revision.h */
  12
  13 #define COUNTED         (1u<<16)
  14
  15 static const char rev_list_usage[] =
  16 "git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
  17 "  limiting output:\n"
  18 "    --max-count=nr\n"
  19 "    --max-age=epoch\n"
  20 "    --min-age=epoch\n"
  21 "    --sparse\n"
  22 "    --no-merges\n"
  23 "    --remove-empty\n"
  24 "    --all\n"
  25 "  ordering output:\n"
  26 "    --topo-order\n"
  27 "    --date-order\n"
  28 "  formatting output:\n"
  29 "    --parents\n"
  30 "    --objects | --objects-edge\n"
  31 "    --unpacked\n"
  32 "    --header | --pretty\n"
  33 "    --abbrev=nr | --no-abbrev\n"
  34 "    --abbrev-commit\n"
  35 "  special purpose:\n"
  36 "    --bisect"
  37 ;
  38
  39 struct rev_info revs;
  40
  41 static int bisect_list = 0;
  42 static int show_timestamp = 0;
  43 static int hdr_termination = 0;
  44 static const char *header_prefix;
  45
  46 static void show_commit(struct commit *commit)
  47 {
  48         if (show_timestamp)
  49                 printf("%lu ", commit->date);
  50         if (header_prefix)
  51                 fputs(header_prefix, stdout);
  52         if (commit->object.flags & BOUNDARY)
  53                 putchar('-');
  54         if (revs.abbrev_commit && revs.abbrev)
  55                 fputs(find_unique_abbrev(commit->object.sha1, revs.abbrev),
  56                       stdout);
  57         else
  58                 fputs(sha1_to_hex(commit->object.sha1), stdout);
  59         if (revs.parents) {
  60                 struct commit_list *parents = commit->parents;
  61                 while (parents) {
  62                         struct object *o = &(parents->item->object);
  63                         parents = parents->next;
  64                         if (o->flags & TMP_MARK)
  65                                 continue;
  66                         printf(" %s", sha1_to_hex(o->sha1));
  67                         o->flags |= TMP_MARK;
  68                 }
  69                 /* TMP_MARK is a general purpose flag that can
  70                  * be used locally, but the user should clean
  71                  * things up after it is done with them.
  72                  */
  73                 for (parents = commit->parents;
  74                      parents;
  75                      parents = parents->next)
  76                         parents->item->object.flags &= ~TMP_MARK;
  77         }
  78         if (revs.commit_format == CMIT_FMT_ONELINE)
  79                 putchar(' ');
  80         else
  81                 putchar('\n');
  82
  83         if (revs.verbose_header) {
  84                 static char pretty_header[16384];
  85                 pretty_print_commit(revs.commit_format, commit, ~0,
  86                                     pretty_header, sizeof(pretty_header),
  87                                     revs.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         init_revisions(&revs);
 300         revs.abbrev = 0;
 301         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 302         argc = setup_revisions(argc, argv, &revs, NULL);
 303
 304         for (i = 1 ; i < argc; i++) {
 305                 const char *arg = argv[i];
 306
 307                 if (!strcmp(arg, "--header")) {
 308                         revs.verbose_header = 1;
 309                         continue;
 310                 }
 311                 if (!strcmp(arg, "--timestamp")) {
 312                         show_timestamp = 1;
 313                         continue;
 314                 }
 315                 if (!strcmp(arg, "--bisect")) {
 316                         bisect_list = 1;
 317                         continue;
 318                 }
 319                 usage(rev_list_usage);
 320
 321         }
 322         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 323                 /* The command line has a --pretty  */
 324                 hdr_termination = '\n';
 325                 if (revs.commit_format == CMIT_FMT_ONELINE)
 326                         header_prefix = "";
 327                 else
 328                         header_prefix = "commit ";
 329         }
 330         else if (revs.verbose_header)
 331                 /* Only --header was specified */
 332                 revs.commit_format = CMIT_FMT_RAW;
 333
 334         list = revs.commits;
 335
 336         if ((!list &&
 337              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 338               !revs.pending_objects)) ||
 339             revs.diff)
 340                 usage(rev_list_usage);
 341
 342         save_commit_buffer = revs.verbose_header;
 343         track_object_refs = 0;
 344         if (bisect_list)
 345                 revs.limited = 1;
 346
 347         prepare_revision_walk(&revs);
 348         if (revs.tree_objects)
 349                 mark_edges_uninteresting(revs.commits);
 350
 351         if (bisect_list)
 352                 revs.commits = find_bisection(revs.commits);
 353
 354         show_commit_list(&revs);
 355
 356         return 0;
 357 }