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authorJunio C Hamano <gitster@pobox.com>2008-06-27 16:22:03 (GMT)
committerJunio C Hamano <gitster@pobox.com>2008-07-01 05:45:51 (GMT)
commit98cf9c3bd7504d36e6049939bf9cc624f2cf5b9f (patch)
tree1d74146b496f63ad16769356320c65e0bf5c2d6e /commit.c
parent6a938648e1454842157b84408acbb6471ec6745f (diff)
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Introduce reduce_heads()
The new function reduce_heads() is given a list of commits, and removes ones that can be reached from other commits in the list. It is useful for reducing the commits randomly thrown at the git-merge command and remove redundant commits that the user shouldn't have given to it. The implementation uses the get_merge_bases_many() introduced in the previous commit. If the merge base between one commit taken from the list and the remaining commits is the commit itself, that means the commit is reachable from some of the other commits. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'commit.c')
-rw-r--r--commit.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/commit.c b/commit.c
index cafed26..d20b14e 100644
--- a/commit.c
+++ b/commit.c
@@ -725,3 +725,48 @@ int in_merge_bases(struct commit *commit, struct commit **reference, int num)
free_commit_list(bases);
return ret;
}
+
+struct commit_list *reduce_heads(struct commit_list *heads)
+{
+ struct commit_list *p;
+ struct commit_list *result = NULL, **tail = &result;
+ struct commit **other;
+ size_t num_head, num_other;
+
+ if (!heads)
+ return NULL;
+
+ /* Avoid unnecessary reallocations */
+ for (p = heads, num_head = 0; p; p = p->next)
+ num_head++;
+ other = xcalloc(sizeof(*other), num_head);
+
+ /* For each commit, see if it can be reached by others */
+ for (p = heads; p; p = p->next) {
+ struct commit_list *q, *base;
+
+ num_other = 0;
+ for (q = heads; q; q = q->next) {
+ if (p == q)
+ continue;
+ other[num_other++] = q->item;
+ }
+ if (num_other) {
+ base = get_merge_bases_many(p->item, num_other, other, 1);
+ } else
+ base = NULL;
+ /*
+ * If p->item does not have anything common with other
+ * commits, there won't be any merge base. If it is
+ * reachable from some of the others, p->item will be
+ * the merge base. If its history is connected with
+ * others, but p->item is not reachable by others, we
+ * will get something other than p->item back.
+ */
+ if (!base || (base->item != p->item))
+ tail = &(commit_list_insert(p->item, tail)->next);
+ free_commit_list(base);
+ }
+ free(other);
+ return result;
+}