#include "string-list.h"
 
 struct merge_options {
+       const char *ancestor;
        const char *branch1;
        const char *branch2;
-       unsigned subtree_merge : 1;
+       enum {
+               MERGE_RECURSIVE_NORMAL = 0,
+               MERGE_RECURSIVE_OURS,
+               MERGE_RECURSIVE_THEIRS
+       } recursive_variant;
+       const char *subtree_shift;
        unsigned buffer_output : 1;
        int verbosity;
        int diff_rename_limit;
 void init_merge_options(struct merge_options *o);
 struct tree *write_tree_from_memory(struct merge_options *o);
 
+/* builtin/merge.c */
+int try_merge_command(const char *strategy, struct commit_list *common, const char *head_arg, struct commit_list *remotes);
+
 #endif