1 files changed, 72 insertions, 5 deletions

diff --git a/include/git2/merge.h b/include/git2/merge.h
index f4c5d9881..8ca90b95f 100644
--- a/include/git2/merge.h
+++ b/include/git2/merge.h
@@ -7,20 +7,65 @@
 #ifndef INCLUDE_git_merge_h__
 #define INCLUDE_git_merge_h__
 
-#include "common.h"
-#include "types.h"
-#include "oid.h"
+#include "git2/common.h"
+#include "git2/types.h"
+#include "git2/oid.h"
+#include "git2/checkout.h"
+#include "git2/index.h"
 
 /**
  * @file git2/merge.h
- * @brief Git merge-base routines
- * @defgroup git_revwalk Git merge-base routines
+ * @brief Git merge routines
+ * @defgroup git_merge Git merge routines
  * @ingroup Git
  * @{
  */
 GIT_BEGIN_DECL
 
 /**
+ * Flags for tree_many diff options.  A combination of these flags can be
+ * passed in via the `flags` value in the `git_diff_tree_many_options`.
+ */
+typedef enum {
+	/** Detect renames */
+	GIT_MERGE_TREE_FIND_RENAMES = (1 << 0),
+} git_merge_tree_flags;
+
+/**
+ * Automerge options for `git_merge_trees_opts`.
+ */ 
+typedef enum {
+	GIT_MERGE_AUTOMERGE_NORMAL = 0,
+	GIT_MERGE_AUTOMERGE_NONE = 1,
+	GIT_MERGE_AUTOMERGE_FAVOR_OURS = 2,
+	GIT_MERGE_AUTOMERGE_FAVOR_THEIRS = 3,
+} git_merge_automerge_flags;
+
+
+typedef struct {
+	unsigned int version;
+	git_merge_tree_flags flags;
+	
+	/** Similarity to consider a file renamed (default 50) */
+	unsigned int rename_threshold;
+	
+	/** Maximum similarity sources to examine (overrides the
+	 * `merge.renameLimit` config) (default 200)
+	 */
+	unsigned int target_limit;
+
+    /** Pluggable similarity metric; pass NULL to use internal metric */
+	git_diff_similarity_metric *metric;
+	
+	/** Flags for automerging content. */
+	git_merge_automerge_flags automerge_flags;
+} git_merge_tree_opts;
+
+#define GIT_MERGE_TREE_OPTS_VERSION 1
+#define GIT_MERGE_TREE_OPTS_INIT {GIT_MERGE_TREE_OPTS_VERSION}
+
+
+/**
  * Find a merge base between two commits
  *
  * @param out the OID of a merge base between 'one' and 'two'
@@ -50,6 +95,28 @@ GIT_EXTERN(int) git_merge_base_many(
 	const git_oid input_array[],
 	size_t length);
 
+/**
+ * Merge two trees, producing a `git_index` that reflects the result of
+ * the merge.
+ *
+ * The returned index must be freed explicitly with `git_index_free`.
+ *
+ * @param out pointer to store the index result in
+ * @param repo repository that contains the given trees
+ * @param ancestor_tree the common ancestor between the trees (or null if none)
+ * @param our_tree the tree that reflects the destination tree
+ * @param their_tree the tree to merge in to `our_tree`
+ * @param opts the merge tree options (or null for defaults)
+ * @return zero on success, -1 on failure.
+ */
+GIT_EXTERN(int) git_merge_trees(
+	git_index **out,
+	git_repository *repo,
+	const git_tree *ancestor_tree,
+	const git_tree *our_tree,
+	const git_tree *their_tree,
+	const git_merge_tree_opts *opts);
+
 /** @} */
 GIT_END_DECL
 #endif