Merge branch 'sb/show-ref-parse-options'

[git.git] / revision.c

diff --git a/revision.c b/revision.c
index 18b7ebbbd599417462b5c4275c2581b91ebeca6a..a31434bdc8ed19674d3c4863e009af0c40d75e73 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -256,10 +256,12 @@ static int everybody_uninteresting(struct commit_list *orig)
 
 /*
  * The goal is to get REV_TREE_NEW as the result only if the
- * diff consists of all '+' (and no other changes), and
- * REV_TREE_DIFFERENT otherwise (of course if the trees are
- * the same we want REV_TREE_SAME).  That means that once we
- * get to REV_TREE_DIFFERENT, we do not have to look any further.
+ * diff consists of all '+' (and no other changes), REV_TREE_OLD
+ * if the whole diff is removal of old data, and otherwise
+ * REV_TREE_DIFFERENT (of course if the trees are the same we
+ * want REV_TREE_SAME).
+ * That means that once we get to REV_TREE_DIFFERENT, we do not
+ * have to look any further.
  */
 static int tree_difference = REV_TREE_SAME;
 
@@ -268,22 +270,9 @@ static void file_add_remove(struct diff_options *options,
                    const unsigned char *sha1,
                    const char *fullpath)
 {
-       int diff = REV_TREE_DIFFERENT;
+       int diff = addremove == '+' ? REV_TREE_NEW : REV_TREE_OLD;
 
-       /*
-        * Is it an add of a new file? It means that the old tree
-        * didn't have it at all, so we will turn "REV_TREE_SAME" ->
-        * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
-        * (and if it already was "REV_TREE_NEW", we'll keep it
-        * "REV_TREE_NEW" of course).
-        */
-       if (addremove == '+') {
-               diff = tree_difference;
-               if (diff != REV_TREE_SAME)
-                       return;
-               diff = REV_TREE_NEW;
-       }
-       tree_difference = diff;
+       tree_difference |= diff;
        if (tree_difference == REV_TREE_DIFFERENT)
                DIFF_OPT_SET(options, HAS_CHANGES);
 }
@@ -305,6 +294,8 @@ static int rev_compare_tree(struct rev_info *revs, struct commit *parent, struct
 
        if (!t1)
                return REV_TREE_NEW;
+       if (!t2)
+               return REV_TREE_OLD;
 
        if (revs->simplify_by_decoration) {
                /*
@@ -323,8 +314,7 @@ static int rev_compare_tree(struct rev_info *revs, struct commit *parent, struct
                if (!revs->prune_data)
                        return REV_TREE_SAME;
        }
-       if (!t2)
-               return REV_TREE_DIFFERENT;
+
        tree_difference = REV_TREE_SAME;
        DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
        if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
@@ -429,6 +419,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
                                p->parents = NULL;
                        }
                /* fallthrough */
+               case REV_TREE_OLD:
                case REV_TREE_DIFFERENT:
                        tree_changed = 1;
                        pp = &parent->next;
@@ -1086,6 +1077,8 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->show_all = 1;
        } else if (!strcmp(arg, "--remove-empty")) {
                revs->remove_empty_trees = 1;
+       } else if (!strcmp(arg, "--merges")) {
+               revs->merges_only = 1;
        } else if (!strcmp(arg, "--no-merges")) {
                revs->no_merges = 1;
        } else if (!strcmp(arg, "--boundary")) {
@@ -1685,6 +1678,8 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
                return commit_ignore;
        if (revs->no_merges && commit->parents && commit->parents->next)
                return commit_ignore;
+       if (revs->merges_only && !(commit->parents && commit->parents->next))
+               return commit_ignore;
        if (!commit_match(commit, revs))
                return commit_ignore;
        if (revs->prune && revs->dense) {