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-rw-r--r--commit-reach.c69
-rw-r--r--commit-reach.h13
2 files changed, 82 insertions, 0 deletions
diff --git a/commit-reach.c b/commit-reach.c
index a9da65c..d5a39de 100644
--- a/commit-reach.c
+++ b/commit-reach.c
@@ -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;
+}
diff --git a/commit-reach.h b/commit-reach.h
index 122a23a..defcef4 100644
--- a/commit-reach.h
+++ b/commit-reach.h
@@ -74,4 +74,17 @@ int can_all_from_reach_with_flag(struct object_array *from,
int can_all_from_reach(struct commit_list *from, struct commit_list *to,
int commit_date_cutoff);
+
+/*
+ * Return a list of commits containing the commits in the 'to' array
+ * that are reachable from at least one commit in the 'from' array.
+ * Also add the given 'flag' to each of the commits in the returned list.
+ *
+ * This method uses the PARENT1 and PARENT2 flags during its operation,
+ * so be sure these flags are not set before calling the method.
+ */
+struct commit_list *get_reachable_subset(struct commit **from, int nr_from,
+ struct commit **to, int nr_to,
+ unsigned int reachable_flag);
+
#endif