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         if (commit->parents) {
  93                 free_commit_list(commit->parents);
  94                 commit->parents = NULL;
  95         }
  96         if (commit->buffer) {
  97                 free(commit->buffer);
  98                 commit->buffer = NULL;
  99         }
 100 }
 101
 102 static struct object_list **process_blob(struct blob *blob,
 103                                          struct object_list **p,
 104                                          struct name_path *path,
 105                                          const char *name)
 106 {
 107         struct object *obj = &blob->object;
 108
 109         if (!revs.blob_objects)
 110                 return p;
 111         if (obj->flags & (UNINTERESTING | SEEN))
 112                 return p;
 113         obj->flags |= SEEN;
 114         name = strdup(name);
 115         return add_object(obj, p, path, name);
 116 }
 117
 118 static struct object_list **process_tree(struct tree *tree,
 119                                          struct object_list **p,
 120                                          struct name_path *path,
 121                                          const char *name)
 122 {
 123         struct object *obj = &tree->object;
 124         struct tree_desc desc;
 125         struct name_entry entry;
 126         struct name_path me;
 127
 128         if (!revs.tree_objects)
 129                 return p;
 130         if (obj->flags & (UNINTERESTING | SEEN))
 131                 return p;
 132         if (parse_tree(tree) < 0)
 133                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 134         obj->flags |= SEEN;
 135         name = strdup(name);
 136         p = add_object(obj, p, path, name);
 137         me.up = path;
 138         me.elem = name;
 139         me.elem_len = strlen(name);
 140
 141         desc.buf = tree->buffer;
 142         desc.size = tree->size;
 143
 144         while (tree_entry(&desc, &entry)) {
 145                 if (S_ISDIR(entry.mode))
 146                         p = process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
 147                 else
 148                         p = process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
 149         }
 150         free(tree->buffer);
 151         tree->buffer = NULL;
 152         return p;
 153 }
 154
 155 static void show_commit_list(struct rev_info *revs)
 156 {
 157         struct commit *commit;
 158         struct object_list *objects = NULL, **p = &objects, *pending;
 159
 160         while ((commit = get_revision(revs)) != NULL) {
 161                 p = process_tree(commit->tree, p, NULL, "");
 162                 show_commit(commit);
 163         }
 164         for (pending = revs->pending_objects; pending; pending = pending->next) {
 165                 struct object *obj = pending->item;
 166                 const char *name = pending->name;
 167                 if (obj->flags & (UNINTERESTING | SEEN))
 168                         continue;
 169                 if (obj->type == TYPE_TAG) {
 170                         obj->flags |= SEEN;
 171                         p = add_object(obj, p, NULL, name);
 172                         continue;
 173                 }
 174                 if (obj->type == TYPE_TREE) {
 175                         p = process_tree((struct tree *)obj, p, NULL, name);
 176                         continue;
 177                 }
 178                 if (obj->type == TYPE_BLOB) {
 179                         p = process_blob((struct blob *)obj, p, NULL, name);
 180                         continue;
 181                 }
 182                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 183         }
 184         while (objects) {
 185                 /* An object with name "foo\n0000000..." can be used to
 186                  * confuse downstream git-pack-objects very badly.
 187                  */
 188                 const char *ep = strchr(objects->name, '\n');
 189                 if (ep) {
 190                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 191                                (int) (ep - objects->name),
 192                                objects->name);
 193                 }
 194                 else
 195                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 196                 objects = objects->next;
 197         }
 198 }
 199
 200 /*
 201  * This is a truly stupid algorithm, but it's only
 202  * used for bisection, and we just don't care enough.
 203  *
 204  * We care just barely enough to avoid recursing for
 205  * non-merge entries.
 206  */
 207 static int count_distance(struct commit_list *entry)
 208 {
 209         int nr = 0;
 210
 211         while (entry) {
 212                 struct commit *commit = entry->item;
 213                 struct commit_list *p;
 214
 215                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 216                         break;
 217                 if (!revs.prune_fn || (commit->object.flags & TREECHANGE))
 218                         nr++;
 219                 commit->object.flags |= COUNTED;
 220                 p = commit->parents;
 221                 entry = p;
 222                 if (p) {
 223                         p = p->next;
 224                         while (p) {
 225                                 nr += count_distance(p);
 226                                 p = p->next;
 227                         }
 228                 }
 229         }
 230
 231         return nr;
 232 }
 233
 234 static void clear_distance(struct commit_list *list)
 235 {
 236         while (list) {
 237                 struct commit *commit = list->item;
 238                 commit->object.flags &= ~COUNTED;
 239                 list = list->next;
 240         }
 241 }
 242
 243 static struct commit_list *find_bisection(struct commit_list *list)
 244 {
 245         int nr, closest;
 246         struct commit_list *p, *best;
 247
 248         nr = 0;
 249         p = list;
 250         while (p) {
 251                 if (!revs.prune_fn || (p->item->object.flags & TREECHANGE))
 252                         nr++;
 253                 p = p->next;
 254         }
 255         closest = 0;
 256         best = list;
 257
 258         for (p = list; p; p = p->next) {
 259                 int distance;
 260
 261                 if (revs.prune_fn && !(p->item->object.flags & TREECHANGE))
 262                         continue;
 263
 264                 distance = count_distance(p);
 265                 clear_distance(list);
 266                 if (nr - distance < distance)
 267                         distance = nr - distance;
 268                 if (distance > closest) {
 269                         best = p;
 270                         closest = distance;
 271                 }
 272         }
 273         if (best)
 274                 best->next = NULL;
 275         return best;
 276 }
 277
 278 static void mark_edge_parents_uninteresting(struct commit *commit)
 279 {
 280         struct commit_list *parents;
 281
 282         for (parents = commit->parents; parents; parents = parents->next) {
 283                 struct commit *parent = parents->item;
 284                 if (!(parent->object.flags & UNINTERESTING))
 285                         continue;
 286                 mark_tree_uninteresting(parent->tree);
 287                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 288                         parent->object.flags |= SHOWN;
 289                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 290                 }
 291         }
 292 }
 293
 294 static void mark_edges_uninteresting(struct commit_list *list)
 295 {
 296         for ( ; list; list = list->next) {
 297                 struct commit *commit = list->item;
 298
 299                 if (commit->object.flags & UNINTERESTING) {
 300                         mark_tree_uninteresting(commit->tree);
 301                         continue;
 302                 }
 303                 mark_edge_parents_uninteresting(commit);
 304         }
 305 }
 306
 307 int cmd_rev_list(int argc, const char **argv, char **envp)
 308 {
 309         struct commit_list *list;
 310         int i;
 311
 312         init_revisions(&revs);
 313         revs.abbrev = 0;
 314         revs.commit_format = CMIT_FMT_UNSPECIFIED;
 315         argc = setup_revisions(argc, argv, &revs, NULL);
 316
 317         for (i = 1 ; i < argc; i++) {
 318                 const char *arg = argv[i];
 319
 320                 if (!strcmp(arg, "--header")) {
 321                         revs.verbose_header = 1;
 322                         continue;
 323                 }
 324                 if (!strcmp(arg, "--timestamp")) {
 325                         show_timestamp = 1;
 326                         continue;
 327                 }
 328                 if (!strcmp(arg, "--bisect")) {
 329                         bisect_list = 1;
 330                         continue;
 331                 }
 332                 usage(rev_list_usage);
 333
 334         }
 335         if (revs.commit_format != CMIT_FMT_UNSPECIFIED) {
 336                 /* The command line has a --pretty  */
 337                 hdr_termination = '\n';
 338                 if (revs.commit_format == CMIT_FMT_ONELINE)
 339                         header_prefix = "";
 340                 else
 341                         header_prefix = "commit ";
 342         }
 343         else if (revs.verbose_header)
 344                 /* Only --header was specified */
 345                 revs.commit_format = CMIT_FMT_RAW;
 346
 347         list = revs.commits;
 348
 349         if ((!list &&
 350              (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) &&
 351               !revs.pending_objects)) ||
 352             revs.diff)
 353                 usage(rev_list_usage);
 354
 355         save_commit_buffer = revs.verbose_header;
 356         track_object_refs = 0;
 357         if (bisect_list)
 358                 revs.limited = 1;
 359
 360         prepare_revision_walk(&revs);
 361         if (revs.tree_objects)
 362                 mark_edges_uninteresting(revs.commits);
 363
 364         if (bisect_list)
 365                 revs.commits = find_bisection(revs.commits);
 366
 367         show_commit_list(&revs);
 368
 369         return 0;
 370 }