files-backend.c: factor out per-worktree code in loose_fill_ref_dir()

diff --git a/commit-reach.c b/commit-reach.c
index 79419be8aff7426ec435f040b88f8e91040b71f4..d5a39defd3d5144f83d4f48e43e54e1f7f49ab29 100644 (file)
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -529,8 +529,8 @@ int commit_contains(struct ref_filter *filter, struct commit *commit,
 
 static int compare_commits_by_gen(const void *_a, const void *_b)
 {
-       const struct commit *a = (const struct commit *)_a;
-       const struct commit *b = (const struct commit *)_b;
+       const struct commit *a = *(const struct commit * const *)_a;
+       const struct commit *b = *(const struct commit * const *)_b;
 
        if (a->generation < b->generation)
                return -1;
@@ -690,3 +690,72 @@ int can_all_from_reach(struct commit_list *from, struct commit_list *to,
        object_array_clear(&from_objs);
        return result;
 }
+
+struct commit_list *get_reachable_subset(struct commit **from, int nr_from,
+                                        struct commit **to, int nr_to,
+                                        unsigned int reachable_flag)
+{
+       struct commit **item;
+       struct commit *current;
+       struct commit_list *found_commits = NULL;
+       struct commit **to_last = to + nr_to;
+       struct commit **from_last = from + nr_from;
+       uint32_t min_generation = GENERATION_NUMBER_INFINITY;
+       int num_to_find = 0;
+
+       struct prio_queue queue = { compare_commits_by_gen_then_commit_date };
+
+       for (item = to; item < to_last; item++) {
+               struct commit *c = *item;
+
+               parse_commit(c);
+               if (c->generation < min_generation)
+                       min_generation = c->generation;
+
+               if (!(c->object.flags & PARENT1)) {
+                       c->object.flags |= PARENT1;
+                       num_to_find++;
+               }
+       }
+
+       for (item = from; item < from_last; item++) {
+               struct commit *c = *item;
+               if (!(c->object.flags & PARENT2)) {
+                       c->object.flags |= PARENT2;
+                       parse_commit(c);
+
+                       prio_queue_put(&queue, *item);
+               }
+       }
+
+       while (num_to_find && (current = prio_queue_get(&queue)) != NULL) {
+               struct commit_list *parents;
+
+               if (current->object.flags & PARENT1) {
+                       current->object.flags &= ~PARENT1;
+                       current->object.flags |= reachable_flag;
+                       commit_list_insert(current, &found_commits);
+                       num_to_find--;
+               }
+
+               for (parents = current->parents; parents; parents = parents->next) {
+                       struct commit *p = parents->item;
+
+                       parse_commit(p);
+
+                       if (p->generation < min_generation)
+                               continue;
+
+                       if (p->object.flags & PARENT2)
+                               continue;
+
+                       p->object.flags |= PARENT2;
+                       prio_queue_put(&queue, p);
+               }
+       }
+
+       clear_commit_marks_many(nr_to, to, PARENT1);
+       clear_commit_marks_many(nr_from, from, PARENT2);
+
+       return found_commits;
+}