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