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_desc desc;
 117         struct name_entry entry;
 118         struct name_path me;
 119
 120         if (!revs.tree_objects)
 121                 return p;
 122         if (obj->flags & (UNINTERESTING | SEEN))
 123                 return p;
 124         if (parse_tree(tree) < 0)
 125                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 126         obj->flags |= SEEN;
 127         name = strdup(name);
 128         p = add_object(obj, p, path, name);
 129         me.up = path;
 130         me.elem = name;
 131         me.elem_len = strlen(name);
 132
 133         desc.buf = tree->buffer;
 134         desc.size = tree->size;
 135
 136         while (tree_entry(&desc, &entry)) {
 137                 if (S_ISDIR(entry.mode))
 138                         p = process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
 139                 else
 140                         p = process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
 141         }
 142         free(tree->buffer);
 143         tree->buffer = NULL;
 144         return p;
 145 }
 146
 147 static void show_commit_list(struct rev_info *revs)
 148 {
 149         struct commit *commit;
 150         struct object_list *objects = NULL, **p = &objects, *pending;
 151
 152         while ((commit = get_revision(revs)) != NULL) {
 153                 p = process_tree(commit->tree, p, NULL, "");
 154                 show_commit(commit);
 155         }
 156         for (pending = revs->pending_objects; pending; pending = pending->next) {
 157                 struct object *obj = pending->item;
 158                 const char *name = pending->name;
 159                 if (obj->flags & (UNINTERESTING | SEEN))
 160                         continue;
 161                 if (obj->type == tag_type) {
 162                         obj->flags |= SEEN;
 163                         p = add_object(obj, p, NULL, name);
 164                         continue;
 165                 }
 166                 if (obj->type == tree_type) {
 167                         p = process_tree((struct tree *)obj, p, NULL, name);
 168                         continue;
 169                 }
 170                 if (obj->type == blob_type) {
 171                         p = process_blob((struct blob *)obj, p, NULL, name);
 172                         continue;
 173                 }
 174                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 175         }
 176         while (objects) {
 177                 /* An object with name "foo\n0000000..." can be used to
 178                  * confuse downstream git-pack-objects very badly.
 179                  */
 180                 const char *ep = strchr(objects->name, '\n');
 181                 if (ep) {
 182                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 183                                (int) (ep - objects->name),
 184                                objects->name);
 185                 }
 186                 else
 187                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 188                 objects = objects->next;
 189         }
 190 }
 191
 192 /*
 193  * This is a truly stupid algorithm, but it's only
 194  * used for bisection, and we just don't care enough.
 195  *
 196  * We care just barely enough to avoid recursing for
 197  * non-merge entries.
 198  */
 199 static int count_distance(struct commit_list *entry)
 200 {
 201         int nr = 0;
 202
 203         while (entry) {
 204                 struct commit *commit = entry->item;
 205                 struct commit_list *p;
 206
 207                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 208                         break;
 209                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 210                         nr++;
 211                 commit->object.flags |= COUNTED;
 212                 p = commit->parents;
 213                 entry = p;
 214                 if (p) {
 215                         p = p->next;
 216                         while (p) {
 217                                 nr += count_distance(p);
 218                                 p = p->next;
 219                         }
 220                 }
 221         }
 222
 223         return nr;
 224 }
 225
 226 static void clear_distance(struct commit_list *list)
 227 {
 228         while (list) {
 229                 struct commit *commit = list->item;
 230                 commit->object.flags &= ~COUNTED;
 231                 list = list->next;
 232         }
 233 }
 234
 235 static struct commit_list *find_bisection(struct commit_list *list)
 236 {
 237         int nr, closest;
 238         struct commit_list *p, *best;
 239
 240         nr = 0;
 241         p = list;
 242         while (p) {
 243                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 244                         nr++;
 245                 p = p->next;
 246         }
 247         closest = 0;
 248         best = list;
 249
 250         for (p = list; p; p = p->next) {
 251                 int distance;
 252
 253                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 254                         continue;
 255
 256                 distance = count_distance(p);
 257                 clear_distance(list);
 258                 if (nr - distance < distance)
 259                         distance = nr - distance;
 260                 if (distance > closest) {
 261                         best = p;
 262                         closest = distance;
 263                 }
 264         }
 265         if (best)
 266                 best->next = NULL;
 267         return best;
 268 }
 269
 270 static void mark_edge_parents_uninteresting(struct commit *commit)
 271 {
 272         struct commit_list *parents;
 273
 274         for (parents = commit->parents; parents; parents = parents->next) {
 275                 struct commit *parent = parents->item;
 276                 if (!(parent->object.flags & UNINTERESTING))
 277                         continue;
 278                 mark_tree_uninteresting(parent->tree);
 279                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 280                         parent->object.flags |= SHOWN;
 281                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 282                 }
 283         }
 284 }
 285
 286 static void mark_edges_uninteresting(struct commit_list *list)
 287 {
 288         for ( ; list; list = list->next) {
 289                 struct commit *commit = list->item;
 290
 291                 if (commit->object.flags & UNINTERESTING) {
 292                         mark_tree_uninteresting(commit->tree);
 293                         continue;
 294                 }
 295                 mark_edge_parents_uninteresting(commit);
 296         }
 297 }
 298
 299 int cmd_rev_list(int argc, const char **argv, char **envp)
 300 {
 301         struct commit_list *list;
 302         int i;
 303
 304         init_revisions(&revs);
 305         revs.abbrev = 0;
 306         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 307         argc = setup_revisions(argc, argv, &revs, NULL);
 308
 309         for (i = 1 ; i < argc; i++) {
 310                 const char *arg = argv[i];
 311
 312                 if (!strcmp(arg, "--header")) {
 313                         revs.verbose_header = 1;
 314                         continue;
 315                 }
 316                 if (!strcmp(arg, "--timestamp")) {
 317                         show_timestamp = 1;
 318                         continue;
 319                 }
 320                 if (!strcmp(arg, "--bisect")) {
 321                         bisect_list = 1;
 322                         continue;
 323                 }
 324                 usage(rev_list_usage);
 325
 326         }
 327         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 328                 /* The command line has a --pretty  */
 329                 hdr_termination = '\n';
 330                 if (revs.commit_format == CMIT_FMT_ONELINE)
 331                         header_prefix = "";
 332                 else
 333                         header_prefix = "commit ";
 334         }
 335         else if (revs.verbose_header)
 336                 /* Only --header was specified */
 337                 revs.commit_format = CMIT_FMT_RAW;
 338
 339         list = revs.commits;
 340
 341         if ((!list &&
 342              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 343               !revs.pending_objects)) ||
 344             revs.diff)
 345                 usage(rev_list_usage);
 346
 347         save_commit_buffer = revs.verbose_header;
 348         track_object_refs = 0;
 349         if (bisect_list)
 350                 revs.limited = 1;
 351
 352         prepare_revision_walk(&revs);
 353         if (revs.tree_objects)
 354                 mark_edges_uninteresting(revs.commits);
 355
 356         if (bisect_list)
 357                 revs.commits = find_bisection(revs.commits);
 358
 359         show_commit_list(&revs);
 360
 361         return 0;
 362 }