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 }
  93
  94 static struct object_list **process_blob(struct blob *blob,
  95                                          struct object_list **p,
  96                                          struct name_path *path,
  97                                          const char *name)
  98 {
  99         struct object *obj = &blob->object;
 100
 101         if (!revs.blob_objects)
 102                 return p;
 103         if (obj->flags & (UNINTERESTING | SEEN))
 104                 return p;
 105         obj->flags |= SEEN;
 106         name = strdup(name);
 107         return add_object(obj, p, path, name);
 108 }
 109
 110 static struct object_list **process_tree(struct tree *tree,
 111                                          struct object_list **p,
 112                                          struct name_path *path,
 113                                          const char *name)
 114 {
 115         struct object *obj = &tree->object;
 116         struct tree_entry_list *entry;
 117         struct name_path me;
 118
 119         if (!revs.tree_objects)
 120                 return p;
 121         if (obj->flags & (UNINTERESTING | SEEN))
 122                 return p;
 123         if (parse_tree(tree) < 0)
 124                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 125         obj->flags |= SEEN;
 126         name = strdup(name);
 127         p = add_object(obj, p, path, name);
 128         me.up = path;
 129         me.elem = name;
 130         me.elem_len = strlen(name);
 131         entry = tree->entries;
 132         tree->entries = NULL;
 133         while (entry) {
 134                 struct tree_entry_list *next = entry->next;
 135                 if (entry->directory)
 136                         p = process_tree(entry->item.tree, p, &me, entry->name);
 137                 else
 138                         p = process_blob(entry->item.blob, p, &me, entry->name);
 139                 free(entry->name);
 140                 free(entry);
 141                 entry = next;
 142         }
 143         return p;
 144 }
 145
 146 static void show_commit_list(struct rev_info *revs)
 147 {
 148         struct commit *commit;
 149         struct object_list *objects = NULL, **p = &objects, *pending;
 150
 151         while ((commit = get_revision(revs)) != NULL) {
 152                 p = process_tree(commit->tree, p, NULL, "");
 153                 show_commit(commit);
 154         }
 155         for (pending = revs->pending_objects; pending; pending = pending->next) {
 156                 struct object *obj = pending->item;
 157                 const char *name = pending->name;
 158                 if (obj->flags & (UNINTERESTING | SEEN))
 159                         continue;
 160                 if (obj->type == tag_type) {
 161                         obj->flags |= SEEN;
 162                         p = add_object(obj, p, NULL, name);
 163                         continue;
 164                 }
 165                 if (obj->type == tree_type) {
 166                         p = process_tree((struct tree *)obj, p, NULL, name);
 167                         continue;
 168                 }
 169                 if (obj->type == blob_type) {
 170                         p = process_blob((struct blob *)obj, p, NULL, name);
 171                         continue;
 172                 }
 173                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 174         }
 175         while (objects) {
 176                 /* An object with name "foo\n0000000..." can be used to
 177                  * confuse downstream git-pack-objects very badly.
 178                  */
 179                 const char *ep = strchr(objects->name, '\n');
 180                 if (ep) {
 181                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 182                                (int) (ep - objects->name),
 183                                objects->name);
 184                 }
 185                 else
 186                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 187                 objects = objects->next;
 188         }
 189 }
 190
 191 /*
 192  * This is a truly stupid algorithm, but it's only
 193  * used for bisection, and we just don't care enough.
 194  *
 195  * We care just barely enough to avoid recursing for
 196  * non-merge entries.
 197  */
 198 static int count_distance(struct commit_list *entry)
 199 {
 200         int nr = 0;
 201
 202         while (entry) {
 203                 struct commit *commit = entry->item;
 204                 struct commit_list *p;
 205
 206                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 207                         break;
 208                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 209                         nr++;
 210                 commit->object.flags |= COUNTED;
 211                 p = commit->parents;
 212                 entry = p;
 213                 if (p) {
 214                         p = p->next;
 215                         while (p) {
 216                                 nr += count_distance(p);
 217                                 p = p->next;
 218                         }
 219                 }
 220         }
 221
 222         return nr;
 223 }
 224
 225 static void clear_distance(struct commit_list *list)
 226 {
 227         while (list) {
 228                 struct commit *commit = list->item;
 229                 commit->object.flags &= ~COUNTED;
 230                 list = list->next;
 231         }
 232 }
 233
 234 static struct commit_list *find_bisection(struct commit_list *list)
 235 {
 236         int nr, closest;
 237         struct commit_list *p, *best;
 238
 239         nr = 0;
 240         p = list;
 241         while (p) {
 242                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 243                         nr++;
 244                 p = p->next;
 245         }
 246         closest = 0;
 247         best = list;
 248
 249         for (p = list; p; p = p->next) {
 250                 int distance;
 251
 252                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 253                         continue;
 254
 255                 distance = count_distance(p);
 256                 clear_distance(list);
 257                 if (nr - distance < distance)
 258                         distance = nr - distance;
 259                 if (distance > closest) {
 260                         best = p;
 261                         closest = distance;
 262                 }
 263         }
 264         if (best)
 265                 best->next = NULL;
 266         return best;
 267 }
 268
 269 static void mark_edge_parents_uninteresting(struct commit *commit)
 270 {
 271         struct commit_list *parents;
 272
 273         for (parents = commit->parents; parents; parents = parents->next) {
 274                 struct commit *parent = parents->item;
 275                 if (!(parent->object.flags & UNINTERESTING))
 276                         continue;
 277                 mark_tree_uninteresting(parent->tree);
 278                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 279                         parent->object.flags |= SHOWN;
 280                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 281                 }
 282         }
 283 }
 284
 285 static void mark_edges_uninteresting(struct commit_list *list)
 286 {
 287         for ( ; list; list = list->next) {
 288                 struct commit *commit = list->item;
 289
 290                 if (commit->object.flags & UNINTERESTING) {
 291                         mark_tree_uninteresting(commit->tree);
 292                         continue;
 293                 }
 294                 mark_edge_parents_uninteresting(commit);
 295         }
 296 }
 297
 298 int cmd_rev_list(int argc, const char **argv, char **envp)
 299 {
 300         struct commit_list *list;
 301         int i;
 302
 303         init_revisions(&revs);
 304         revs.abbrev = 0;
 305         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 306         argc = setup_revisions(argc, argv, &revs, NULL);
 307
 308         for (i = 1 ; i < argc; i++) {
 309                 const char *arg = argv[i];
 310
 311                 if (!strcmp(arg, "--header")) {
 312                         revs.verbose_header = 1;
 313                         continue;
 314                 }
 315                 if (!strcmp(arg, "--timestamp")) {
 316                         show_timestamp = 1;
 317                         continue;
 318                 }
 319                 if (!strcmp(arg, "--bisect")) {
 320                         bisect_list = 1;
 321                         continue;
 322                 }
 323                 usage(rev_list_usage);
 324
 325         }
 326         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 327                 /* The command line has a --pretty  */
 328                 hdr_termination = '\n';
 329                 if (revs.commit_format == CMIT_FMT_ONELINE)
 330                         header_prefix = "";
 331                 else
 332                         header_prefix = "commit ";
 333         }
 334         else if (revs.verbose_header)
 335                 /* Only --header was specified */
 336                 revs.commit_format = CMIT_FMT_RAW;
 337
 338         list = revs.commits;
 339
 340         if ((!list &&
 341              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 342               !revs.pending_objects)) ||
 343             revs.diff)
 344                 usage(rev_list_usage);
 345
 346         save_commit_buffer = revs.verbose_header;
 347         track_object_refs = 0;
 348         if (bisect_list)
 349                 revs.limited = 1;
 350
 351         prepare_revision_walk(&revs);
 352         if (revs.tree_objects)
 353                 mark_edges_uninteresting(revs.commits);
 354
 355         if (bisect_list)
 356                 revs.commits = find_bisection(revs.commits);
 357
 358         show_commit_list(&revs);
 359
 360         return 0;
 361 }