submodule: print graph output next to submodule log

diff --git a/revision.c b/revision.c
index cf620c6b3693e2d18b2cacd33574a03b34e4c48e..71e62d831229773a9af2c4a81d72be5b33d3c921 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -1970,6 +1970,22 @@ static struct merge_simplify_state *locate_simplify_state(struct rev_info *revs,
        return st;
 }
 
+static void remove_treesame_parents(struct commit *commit)
+{
+       struct commit_list **pp, *p;
+
+       pp = &commit->parents;
+       while ((p = *pp) != NULL) {
+               struct commit *parent = p->item;
+               if (parent->object.flags & TREESAME) {
+                       *pp = p->next;
+                       free(p);
+                       continue;
+               }
+               pp = &p->next;
+       }
+}
+
 static struct commit_list **simplify_one(struct rev_info *revs, struct commit *commit, struct commit_list **tail)
 {
        struct commit_list *p;
@@ -2022,10 +2038,18 @@ static struct commit_list **simplify_one(struct rev_info *revs, struct commit *c
                if (revs->first_parent_only)
                        break;
        }
-       if (!revs->first_parent_only)
-               cnt = remove_duplicate_parents(commit);
-       else
+
+       if (revs->first_parent_only) {
                cnt = 1;
+       } else {
+               /*
+                * A merge with a tree-same parent is useless
+                */
+               if (commit->parents && commit->parents->next)
+                       remove_treesame_parents(commit);
+
+               cnt = remove_duplicate_parents(commit);
+       }
 
        /*
         * It is possible that we are a merge and one side branch