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 "diff.h"
   8 #include "revision.h"
   9
  10 /* bits #0-3 in revision.h */
  11
  12 #define COUNTED         (1u << 4)
  13 #define TMP_MARK        (1u << 5) /* for isolated cases; clean after use */
  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 "  special purpose:\n"
  35 "    --bisect"
  36 ;
  37
  38 struct rev_info revs;
  39
  40 static int bisect_list = 0;
  41 static int verbose_header = 0;
  42 static int abbrev = DEFAULT_ABBREV;
  43 static int show_parents = 0;
  44 static int hdr_termination = 0;
  45 static const char *commit_prefix = "";
  46 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
  47
  48 static void show_commit(struct commit *commit)
  49 {
  50         printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
  51         if (show_parents) {
  52                 struct commit_list *parents = commit->parents;
  53                 while (parents) {
  54                         struct object *o = &(parents->item->object);
  55                         parents = parents->next;
  56                         if (o->flags & TMP_MARK)
  57                                 continue;
  58                         printf(" %s", sha1_to_hex(o->sha1));
  59                         o->flags |= TMP_MARK;
  60                 }
  61                 /* TMP_MARK is a general purpose flag that can
  62                  * be used locally, but the user should clean
  63                  * things up after it is done with them.
  64                  */
  65                 for (parents = commit->parents;
  66                      parents;
  67                      parents = parents->next)
  68                         parents->item->object.flags &= ~TMP_MARK;
  69         }
  70         if (commit_format == CMIT_FMT_ONELINE)
  71                 putchar(' ');
  72         else
  73                 putchar('\n');
  74
  75         if (verbose_header) {
  76                 static char pretty_header[16384];
  77                 pretty_print_commit(commit_format, commit, ~0, pretty_header, sizeof(pretty_header), abbrev);
  78                 printf("%s%c", pretty_header, hdr_termination);
  79         }
  80         fflush(stdout);
  81 }
  82
  83 static struct object_list **process_blob(struct blob *blob,
  84                                          struct object_list **p,
  85                                          struct name_path *path,
  86                                          const char *name)
  87 {
  88         struct object *obj = &blob->object;
  89
  90         if (!revs.blob_objects)
  91                 return p;
  92         if (obj->flags & (UNINTERESTING | SEEN))
  93                 return p;
  94         obj->flags |= SEEN;
  95         return add_object(obj, p, path, name);
  96 }
  97
  98 static struct object_list **process_tree(struct tree *tree,
  99                                          struct object_list **p,
 100                                          struct name_path *path,
 101                                          const char *name)
 102 {
 103         struct object *obj = &tree->object;
 104         struct tree_entry_list *entry;
 105         struct name_path me;
 106
 107         if (!revs.tree_objects)
 108                 return p;
 109         if (obj->flags & (UNINTERESTING | SEEN))
 110                 return p;
 111         if (parse_tree(tree) < 0)
 112                 die("bad tree object %s", sha1_to_hex(obj->sha1));
 113         obj->flags |= SEEN;
 114         p = add_object(obj, p, path, name);
 115         me.up = path;
 116         me.elem = name;
 117         me.elem_len = strlen(name);
 118         entry = tree->entries;
 119         tree->entries = NULL;
 120         while (entry) {
 121                 struct tree_entry_list *next = entry->next;
 122                 if (entry->directory)
 123                         p = process_tree(entry->item.tree, p, &me, entry->name);
 124                 else
 125                         p = process_blob(entry->item.blob, p, &me, entry->name);
 126                 free(entry);
 127                 entry = next;
 128         }
 129         return p;
 130 }
 131
 132 static void show_commit_list(struct rev_info *revs)
 133 {
 134         struct commit *commit;
 135         struct object_list *objects = NULL, **p = &objects, *pending;
 136
 137         while ((commit = get_revision(revs)) != NULL) {
 138                 p = process_tree(commit->tree, p, NULL, "");
 139                 show_commit(commit);
 140         }
 141         for (pending = revs->pending_objects; pending; pending = pending->next) {
 142                 struct object *obj = pending->item;
 143                 const char *name = pending->name;
 144                 if (obj->flags & (UNINTERESTING | SEEN))
 145                         continue;
 146                 if (obj->type == tag_type) {
 147                         obj->flags |= SEEN;
 148                         p = add_object(obj, p, NULL, name);
 149                         continue;
 150                 }
 151                 if (obj->type == tree_type) {
 152                         p = process_tree((struct tree *)obj, p, NULL, name);
 153                         continue;
 154                 }
 155                 if (obj->type == blob_type) {
 156                         p = process_blob((struct blob *)obj, p, NULL, name);
 157                         continue;
 158                 }
 159                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
 160         }
 161         while (objects) {
 162                 /* An object with name "foo\n0000000..." can be used to
 163                  * confuse downstream git-pack-objects very badly.
 164                  */
 165                 const char *ep = strchr(objects->name, '\n');
 166                 if (ep) {
 167                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
 168                                (int) (ep - objects->name),
 169                                objects->name);
 170                 }
 171                 else
 172                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
 173                 objects = objects->next;
 174         }
 175 }
 176
 177 /*
 178  * This is a truly stupid algorithm, but it's only
 179  * used for bisection, and we just don't care enough.
 180  *
 181  * We care just barely enough to avoid recursing for
 182  * non-merge entries.
 183  */
 184 static int count_distance(struct commit_list *entry)
 185 {
 186         int nr = 0;
 187
 188         while (entry) {
 189                 struct commit *commit = entry->item;
 190                 struct commit_list *p;
 191
 192                 if (commit->object.flags & (UNINTERESTING | COUNTED))
 193                         break;
 194                 if (!revs.paths || (commit->object.flags & TREECHANGE))
 195                         nr++;
 196                 commit->object.flags |= COUNTED;
 197                 p = commit->parents;
 198                 entry = p;
 199                 if (p) {
 200                         p = p->next;
 201                         while (p) {
 202                                 nr += count_distance(p);
 203                                 p = p->next;
 204                         }
 205                 }
 206         }
 207
 208         return nr;
 209 }
 210
 211 static void clear_distance(struct commit_list *list)
 212 {
 213         while (list) {
 214                 struct commit *commit = list->item;
 215                 commit->object.flags &= ~COUNTED;
 216                 list = list->next;
 217         }
 218 }
 219
 220 static struct commit_list *find_bisection(struct commit_list *list)
 221 {
 222         int nr, closest;
 223         struct commit_list *p, *best;
 224
 225         nr = 0;
 226         p = list;
 227         while (p) {
 228                 if (!revs.paths || (p->item->object.flags & TREECHANGE))
 229                         nr++;
 230                 p = p->next;
 231         }
 232         closest = 0;
 233         best = list;
 234
 235         for (p = list; p; p = p->next) {
 236                 int distance;
 237
 238                 if (revs.paths && !(p->item->object.flags & TREECHANGE))
 239                         continue;
 240
 241                 distance = count_distance(p);
 242                 clear_distance(list);
 243                 if (nr - distance < distance)
 244                         distance = nr - distance;
 245                 if (distance > closest) {
 246                         best = p;
 247                         closest = distance;
 248                 }
 249         }
 250         if (best)
 251                 best->next = NULL;
 252         return best;
 253 }
 254
 255 static void mark_edge_parents_uninteresting(struct commit *commit)
 256 {
 257         struct commit_list *parents;
 258
 259         for (parents = commit->parents; parents; parents = parents->next) {
 260                 struct commit *parent = parents->item;
 261                 if (!(parent->object.flags & UNINTERESTING))
 262                         continue;
 263                 mark_tree_uninteresting(parent->tree);
 264                 if (revs.edge_hint && !(parent->object.flags & SHOWN)) {
 265                         parent->object.flags |= SHOWN;
 266                         printf("-%s\n", sha1_to_hex(parent->object.sha1));
 267                 }
 268         }
 269 }
 270
 271 static void mark_edges_uninteresting(struct commit_list *list)
 272 {
 273         for ( ; list; list = list->next) {
 274                 struct commit *commit = list->item;
 275
 276                 if (commit->object.flags & UNINTERESTING) {
 277                         mark_tree_uninteresting(commit->tree);
 278                         continue;
 279                 }
 280                 mark_edge_parents_uninteresting(commit);
 281         }
 282 }
 283
 284 int main(int argc, const char **argv)
 285 {
 286         struct commit_list *list;
 287         int i;
 288
 289         argc = setup_revisions(argc, argv, &revs, NULL);
 290
 291         for (i = 1 ; i < argc; i++) {
 292                 const char *arg = argv[i];
 293
 294                 /* accept -<digit>, like traditilnal "head" */
 295                 if ((*arg == '-') && isdigit(arg[1])) {
 296                         revs.max_count = atoi(arg + 1);
 297                         continue;
 298                 }
 299                 if (!strcmp(arg, "-n")) {
 300                         if (++i >= argc)
 301                                 die("-n requires an argument");
 302                         revs.max_count = atoi(argv[i]);
 303                         continue;
 304                 }
 305                 if (!strncmp(arg,"-n",2)) {
 306                         revs.max_count = atoi(arg + 2);
 307                         continue;
 308                 }
 309                 if (!strcmp(arg, "--header")) {
 310                         verbose_header = 1;
 311                         continue;
 312                 }
 313                 if (!strcmp(arg, "--no-abbrev")) {
 314                         abbrev = 0;
 315                         continue;
 316                 }
 317                 if (!strncmp(arg, "--abbrev=", 9)) {
 318                         abbrev = strtoul(arg + 9, NULL, 10);
 319                         if (abbrev && abbrev < MINIMUM_ABBREV)
 320                                 abbrev = MINIMUM_ABBREV;
 321                         else if (40 < abbrev)
 322                                 abbrev = 40;
 323                         continue;
 324                 }
 325                 if (!strncmp(arg, "--pretty", 8)) {
 326                         commit_format = get_commit_format(arg+8);
 327                         verbose_header = 1;
 328                         hdr_termination = '\n';
 329                         if (commit_format == CMIT_FMT_ONELINE)
 330                                 commit_prefix = "";
 331                         else
 332                                 commit_prefix = "commit ";
 333                         continue;
 334                 }
 335                 if (!strcmp(arg, "--parents")) {
 336                         show_parents = 1;
 337                         continue;
 338                 }
 339                 if (!strcmp(arg, "--bisect")) {
 340                         bisect_list = 1;
 341                         continue;
 342                 }
 343                 usage(rev_list_usage);
 344
 345         }
 346
 347         list = revs.commits;
 348
 349         if (!list &&
 350             (!(revs.tag_objects||revs.tree_objects||revs.blob_objects) && !revs.pending_objects))
 351                 usage(rev_list_usage);
 352
 353         prepare_revision_walk(&revs);
 354         if (revs.tree_objects)
 355                 mark_edges_uninteresting(revs.commits);
 356
 357         if (bisect_list)
 358                 revs.commits = find_bisection(revs.commits);
 359
 360         save_commit_buffer = verbose_header;
 361         track_object_refs = 0;
 362
 363         show_commit_list(&revs);
 364
 365         return 0;
 366 }