revision.c

   1 #include "cache.h"
   2 #include "tag.h"
   3 #include "blob.h"
   4 #include "tree.h"
   5 #include "commit.h"
   6 #include "refs.h"
   7 #include "revision.h"
   8
   9 static char *path_name(struct name_path *path, const char *name)
  10 {
  11         struct name_path *p;
  12         char *n, *m;
  13         int nlen = strlen(name);
  14         int len = nlen + 1;
  15
  16         for (p = path; p; p = p->up) {
  17                 if (p->elem_len)
  18                         len += p->elem_len + 1;
  19         }
  20         n = xmalloc(len);
  21         m = n + len - (nlen + 1);
  22         strcpy(m, name);
  23         for (p = path; p; p = p->up) {
  24                 if (p->elem_len) {
  25                         m -= p->elem_len + 1;
  26                         memcpy(m, p->elem, p->elem_len);
  27                         m[p->elem_len] = '/';
  28                 }
  29         }
  30         return n;
  31 }
  32
  33 struct object_list **add_object(struct object *obj,
  34                                        struct object_list **p,
  35                                        struct name_path *path,
  36                                        const char *name)
  37 {
  38         struct object_list *entry = xmalloc(sizeof(*entry));
  39         entry->item = obj;
  40         entry->next = *p;
  41         entry->name = path_name(path, name);
  42         *p = entry;
  43         return &entry->next;
  44 }
  45
  46 static void mark_blob_uninteresting(struct blob *blob)
  47 {
  48         if (blob->object.flags & UNINTERESTING)
  49                 return;
  50         blob->object.flags |= UNINTERESTING;
  51 }
  52
  53 void mark_tree_uninteresting(struct tree *tree)
  54 {
  55         struct object *obj = &tree->object;
  56         struct tree_entry_list *entry;
  57
  58         if (obj->flags & UNINTERESTING)
  59                 return;
  60         obj->flags |= UNINTERESTING;
  61         if (!has_sha1_file(obj->sha1))
  62                 return;
  63         if (parse_tree(tree) < 0)
  64                 die("bad tree %s", sha1_to_hex(obj->sha1));
  65         entry = tree->entries;
  66         tree->entries = NULL;
  67         while (entry) {
  68                 struct tree_entry_list *next = entry->next;
  69                 if (entry->directory)
  70                         mark_tree_uninteresting(entry->item.tree);
  71                 else
  72                         mark_blob_uninteresting(entry->item.blob);
  73                 free(entry);
  74                 entry = next;
  75         }
  76 }
  77
  78 void mark_parents_uninteresting(struct commit *commit)
  79 {
  80         struct commit_list *parents = commit->parents;
  81
  82         while (parents) {
  83                 struct commit *commit = parents->item;
  84                 commit->object.flags |= UNINTERESTING;
  85
  86                 /*
  87                  * Normally we haven't parsed the parent
  88                  * yet, so we won't have a parent of a parent
  89                  * here. However, it may turn out that we've
  90                  * reached this commit some other way (where it
  91                  * wasn't uninteresting), in which case we need
  92                  * to mark its parents recursively too..
  93                  */
  94                 if (commit->parents)
  95                         mark_parents_uninteresting(commit);
  96
  97                 /*
  98                  * A missing commit is ok iff its parent is marked
  99                  * uninteresting.
 100                  *
 101                  * We just mark such a thing parsed, so that when
 102                  * it is popped next time around, we won't be trying
 103                  * to parse it and get an error.
 104                  */
 105                 if (!has_sha1_file(commit->object.sha1))
 106                         commit->object.parsed = 1;
 107                 parents = parents->next;
 108         }
 109 }
 110
 111 static void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
 112 {
 113         add_object(obj, &revs->pending_objects, NULL, name);
 114 }
 115
 116 static struct commit *get_commit_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
 117 {
 118         struct object *object;
 119
 120         object = parse_object(sha1);
 121         if (!object)
 122                 die("bad object %s", name);
 123
 124         /*
 125          * Tag object? Look what it points to..
 126          */
 127         while (object->type == tag_type) {
 128                 struct tag *tag = (struct tag *) object;
 129                 object->flags |= flags;
 130                 if (revs->tag_objects && !(object->flags & UNINTERESTING))
 131                         add_pending_object(revs, object, tag->tag);
 132                 object = parse_object(tag->tagged->sha1);
 133                 if (!object)
 134                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
 135         }
 136
 137         /*
 138          * Commit object? Just return it, we'll do all the complex
 139          * reachability crud.
 140          */
 141         if (object->type == commit_type) {
 142                 struct commit *commit = (struct commit *)object;
 143                 object->flags |= flags;
 144                 if (parse_commit(commit) < 0)
 145                         die("unable to parse commit %s", name);
 146                 if (flags & UNINTERESTING)
 147                         mark_parents_uninteresting(commit);
 148                 return commit;
 149         }
 150
 151         /*
 152          * Tree object? Either mark it uniniteresting, or add it
 153          * to the list of objects to look at later..
 154          */
 155         if (object->type == tree_type) {
 156                 struct tree *tree = (struct tree *)object;
 157                 if (!revs->tree_objects)
 158                         return NULL;
 159                 if (flags & UNINTERESTING) {
 160                         mark_tree_uninteresting(tree);
 161                         return NULL;
 162                 }
 163                 add_pending_object(revs, object, "");
 164                 return NULL;
 165         }
 166
 167         /*
 168          * Blob object? You know the drill by now..
 169          */
 170         if (object->type == blob_type) {
 171                 struct blob *blob = (struct blob *)object;
 172                 if (!revs->blob_objects)
 173                         return NULL;
 174                 if (flags & UNINTERESTING) {
 175                         mark_blob_uninteresting(blob);
 176                         return NULL;
 177                 }
 178                 add_pending_object(revs, object, "");
 179                 return NULL;
 180         }
 181         die("%s is unknown object", name);
 182 }
 183
 184 static void add_one_commit(struct commit *commit, struct rev_info *revs)
 185 {
 186         if (!commit || (commit->object.flags & SEEN))
 187                 return;
 188         commit->object.flags |= SEEN;
 189         commit_list_insert(commit, &revs->commits);
 190 }
 191
 192 static int all_flags;
 193 static struct rev_info *all_revs;
 194
 195 static int handle_one_ref(const char *path, const unsigned char *sha1)
 196 {
 197         struct commit *commit = get_commit_reference(all_revs, path, sha1, all_flags);
 198         add_one_commit(commit, all_revs);
 199         return 0;
 200 }
 201
 202 static void handle_all(struct rev_info *revs, unsigned flags)
 203 {
 204         all_revs = revs;
 205         all_flags = flags;
 206         for_each_ref(handle_one_ref);
 207 }
 208
 209 /*
 210  * Parse revision information, filling in the "rev_info" structure,
 211  * and removing the used arguments from the argument list.
 212  *
 213  * Returns the number of arguments left ("new argc").
 214  */
 215 int setup_revisions(int argc, const char **argv, struct rev_info *revs)
 216 {
 217         int i, flags, seen_dashdash;
 218         const char *def = NULL;
 219         const char **unrecognized = argv+1;
 220         int left = 1;
 221
 222         memset(revs, 0, sizeof(*revs));
 223         revs->lifo = 1;
 224         revs->dense = 1;
 225         revs->prefix = setup_git_directory();
 226         revs->max_age = -1;
 227         revs->min_age = -1;
 228         revs->max_count = -1;
 229
 230         /* First, search for "--" */
 231         seen_dashdash = 0;
 232         for (i = 1; i < argc; i++) {
 233                 const char *arg = argv[i];
 234                 if (strcmp(arg, "--"))
 235                         continue;
 236                 argv[i] = NULL;
 237                 argc = i;
 238                 revs->paths = get_pathspec(revs->prefix, argv + i + 1);
 239                 seen_dashdash = 1;
 240                 break;
 241         }
 242
 243         flags = 0;
 244         for (i = 1; i < argc; i++) {
 245                 struct commit *commit;
 246                 const char *arg = argv[i];
 247                 unsigned char sha1[20];
 248                 char *dotdot;
 249                 int local_flags;
 250
 251                 if (*arg == '-') {
 252                         if (!strncmp(arg, "--max-count=", 12)) {
 253                                 revs->max_count = atoi(arg + 12);
 254                                 continue;
 255                         }
 256                         if (!strncmp(arg, "--max-age=", 10)) {
 257                                 revs->max_age = atoi(arg + 10);
 258                                 continue;
 259                         }
 260                         if (!strncmp(arg, "--min-age=", 10)) {
 261                                 revs->min_age = atoi(arg + 10);
 262                                 continue;
 263                         }
 264                         if (!strcmp(arg, "--all")) {
 265                                 handle_all(revs, flags);
 266                                 continue;
 267                         }
 268                         if (!strcmp(arg, "--not")) {
 269                                 flags ^= UNINTERESTING;
 270                                 continue;
 271                         }
 272                         if (!strcmp(arg, "--default")) {
 273                                 if (++i >= argc)
 274                                         die("bad --default argument");
 275                                 def = argv[i];
 276                                 continue;
 277                         }
 278                         if (!strcmp(arg, "--topo-order")) {
 279                                 revs->topo_order = 1;
 280                                 continue;
 281                         }
 282                         if (!strcmp(arg, "--date-order")) {
 283                                 revs->lifo = 0;
 284                                 revs->topo_order = 1;
 285                                 continue;
 286                         }
 287                         if (!strcmp(arg, "--dense")) {
 288                                 revs->dense = 1;
 289                                 continue;
 290                         }
 291                         if (!strcmp(arg, "--sparse")) {
 292                                 revs->dense = 0;
 293                                 continue;
 294                         }
 295                         if (!strcmp(arg, "--remove-empty")) {
 296                                 revs->remove_empty_trees = 1;
 297                                 continue;
 298                         }
 299                         if (!strcmp(arg, "--objects")) {
 300                                 revs->tag_objects = 1;
 301                                 revs->tree_objects = 1;
 302                                 revs->blob_objects = 1;
 303                                 continue;
 304                         }
 305                         if (!strcmp(arg, "--objects-edge")) {
 306                                 revs->tag_objects = 1;
 307                                 revs->tree_objects = 1;
 308                                 revs->blob_objects = 1;
 309                                 revs->edge_hint = 1;
 310                                 continue;
 311                         }
 312                         *unrecognized++ = arg;
 313                         left++;
 314                         continue;
 315                 }
 316                 dotdot = strstr(arg, "..");
 317                 if (dotdot) {
 318                         unsigned char from_sha1[20];
 319                         char *next = dotdot + 2;
 320                         *dotdot = 0;
 321                         if (!*next)
 322                                 next = "HEAD";
 323                         if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
 324                                 struct commit *exclude;
 325                                 struct commit *include;
 326
 327                                 exclude = get_commit_reference(revs, arg, from_sha1, flags ^ UNINTERESTING);
 328                                 include = get_commit_reference(revs, next, sha1, flags);
 329                                 if (!exclude || !include)
 330                                         die("Invalid revision range %s..%s", arg, next);
 331                                 add_one_commit(exclude, revs);
 332                                 add_one_commit(include, revs);
 333                                 continue;
 334                         }
 335                         *dotdot = '.';
 336                 }
 337                 local_flags = 0;
 338                 if (*arg == '^') {
 339                         local_flags = UNINTERESTING;
 340                         arg++;
 341                 }
 342                 if (get_sha1(arg, sha1) < 0) {
 343                         struct stat st;
 344                         int j;
 345
 346                         if (seen_dashdash || local_flags)
 347                                 die("bad revision '%s'", arg);
 348
 349                         /* If we didn't have a "--", all filenames must exist */
 350                         for (j = i; j < argc; j++) {
 351                                 if (lstat(argv[j], &st) < 0)
 352                                         die("'%s': %s", arg, strerror(errno));
 353                         }
 354                         revs->paths = get_pathspec(revs->prefix, argv + i);
 355                         break;
 356                 }
 357                 commit = get_commit_reference(revs, arg, sha1, flags ^ local_flags);
 358                 add_one_commit(commit, revs);
 359         }
 360         if (def && !revs->commits) {
 361                 unsigned char sha1[20];
 362                 struct commit *commit;
 363                 if (get_sha1(def, sha1) < 0)
 364                         die("bad default revision '%s'", def);
 365                 commit = get_commit_reference(revs, def, sha1, 0);
 366                 add_one_commit(commit, revs);
 367         }
 368         *unrecognized = NULL;
 369         return left;
 370 }