1 files changed, 204 insertions, 0 deletions
diff --git a/src/libgit2/merge.h b/src/libgit2/merge.h
new file mode 100644
index 000000000..23932905e
--- /dev/null
+++ b/src/libgit2/merge.h
@@ -0,0 +1,204 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_merge_h__
+#define INCLUDE_merge_h__
+
+#include "common.h"
+
+#include "vector.h"
+#include "commit_list.h"
+#include "pool.h"
+#include "iterator.h"
+
+#include "git2/types.h"
+#include "git2/merge.h"
+#include "git2/sys/merge.h"
+
+#define GIT_MERGE_MSG_FILE		"MERGE_MSG"
+#define GIT_MERGE_MODE_FILE		"MERGE_MODE"
+#define GIT_MERGE_FILE_MODE		0666
+
+#define GIT_MERGE_DEFAULT_RENAME_THRESHOLD	50
+#define GIT_MERGE_DEFAULT_TARGET_LIMIT		1000
+
+/** Types of changes when files are merged from branch to branch. */
+typedef enum {
+	/* No conflict - a change only occurs in one branch. */
+	GIT_MERGE_DIFF_NONE = 0,
+
+	/* Occurs when a file is modified in both branches. */
+	GIT_MERGE_DIFF_BOTH_MODIFIED = (1 << 0),
+
+	/* Occurs when a file is added in both branches. */
+	GIT_MERGE_DIFF_BOTH_ADDED = (1 << 1),
+
+	/* Occurs when a file is deleted in both branches. */
+	GIT_MERGE_DIFF_BOTH_DELETED = (1 << 2),
+
+	/* Occurs when a file is modified in one branch and deleted in the other. */
+	GIT_MERGE_DIFF_MODIFIED_DELETED = (1 << 3),
+
+	/* Occurs when a file is renamed in one branch and modified in the other. */
+	GIT_MERGE_DIFF_RENAMED_MODIFIED = (1 << 4),
+
+	/* Occurs when a file is renamed in one branch and deleted in the other. */
+	GIT_MERGE_DIFF_RENAMED_DELETED = (1 << 5),
+
+	/* Occurs when a file is renamed in one branch and a file with the same
+	 * name is added in the other.  Eg, A->B and new file B.  Core git calls
+	 * this a "rename/delete". */
+	GIT_MERGE_DIFF_RENAMED_ADDED = (1 << 6),
+
+	/* Occurs when both a file is renamed to the same name in the ours and
+	 * theirs branches.  Eg, A->B and A->B in both.  Automergeable. */
+	GIT_MERGE_DIFF_BOTH_RENAMED = (1 << 7),
+
+	/* Occurs when a file is renamed to different names in the ours and theirs
+	 * branches.  Eg, A->B and A->C. */
+	GIT_MERGE_DIFF_BOTH_RENAMED_1_TO_2 = (1 << 8),
+
+	/* Occurs when two files are renamed to the same name in the ours and
+	 * theirs branches.  Eg, A->C and B->C. */
+	GIT_MERGE_DIFF_BOTH_RENAMED_2_TO_1 = (1 << 9),
+
+	/* Occurs when an item at a path in one branch is a directory, and an
+	 * item at the same path in a different branch is a file. */
+	GIT_MERGE_DIFF_DIRECTORY_FILE = (1 << 10),
+
+	/* The child of a folder that is in a directory/file conflict. */
+	GIT_MERGE_DIFF_DF_CHILD = (1 << 11)
+} git_merge_diff_t;
+
+typedef struct {
+	git_repository *repo;
+	git_pool pool;
+
+	/* Vector of git_index_entry that represent the merged items that
+	 * have been staged, either because only one side changed, or because
+	 * the two changes were non-conflicting and mergeable.  These items
+	 * will be written as staged entries in the main index.
+	 */
+	git_vector staged;
+
+	/* Vector of git_merge_diff entries that represent the conflicts that
+	 * have not been automerged.  These items will be written to high-stage
+	 * entries in the main index.
+	 */
+	git_vector conflicts;
+
+	/* Vector of git_merge_diff that have been automerged.  These items
+	 * will be written to the REUC when the index is produced.
+	 */
+	git_vector resolved;
+} git_merge_diff_list;
+
+/**
+ * Description of changes to one file across three trees.
+ */
+typedef struct {
+	git_merge_diff_t type;
+
+	git_index_entry ancestor_entry;
+
+	git_index_entry our_entry;
+	git_delta_t our_status;
+
+	git_index_entry their_entry;
+	git_delta_t their_status;
+
+} git_merge_diff;
+
+int git_merge__bases_many(
+	git_commit_list **out,
+	git_revwalk *walk,
+	git_commit_list_node *one,
+	git_vector *twos,
+	uint32_t minimum_generation);
+
+/*
+ * Three-way tree differencing
+ */
+
+git_merge_diff_list *git_merge_diff_list__alloc(git_repository *repo);
+
+int git_merge_diff_list__find_differences(
+	git_merge_diff_list *merge_diff_list,
+	git_iterator *ancestor_iterator,
+	git_iterator *ours_iter,
+	git_iterator *theirs_iter);
+
+int git_merge_diff_list__find_renames(git_repository *repo, git_merge_diff_list *merge_diff_list, const git_merge_options *opts);
+
+void git_merge_diff_list__free(git_merge_diff_list *diff_list);
+
+/* Merge metadata setup */
+
+int git_merge__setup(
+	git_repository *repo,
+	const git_annotated_commit *our_head,
+	const git_annotated_commit *heads[],
+	size_t heads_len);
+
+int git_merge__iterators(
+	git_index **out,
+	git_repository *repo,
+	git_iterator *ancestor_iter,
+	git_iterator *our_iter,
+	git_iterator *their_iter,
+	const git_merge_options *given_opts);
+
+int git_merge__check_result(git_repository *repo, git_index *index_new);
+
+int git_merge__append_conflicts_to_merge_msg(git_repository *repo, git_index *index);
+
+/* Merge files */
+
+GIT_INLINE(const char *) git_merge_file__best_path(
+	const char *ancestor,
+	const char *ours,
+	const char *theirs)
+{
+	if (!ancestor) {
+		if (ours && theirs && strcmp(ours, theirs) == 0)
+			return ours;
+
+		return NULL;
+	}
+
+	if (ours && strcmp(ancestor, ours) == 0)
+		return theirs;
+	else if(theirs && strcmp(ancestor, theirs) == 0)
+		return ours;
+
+	return NULL;
+}
+
+GIT_INLINE(uint32_t) git_merge_file__best_mode(
+	uint32_t ancestor, uint32_t ours, uint32_t theirs)
+{
+	/*
+	 * If ancestor didn't exist and either ours or theirs is executable,
+	 * assume executable.  Otherwise, if any mode changed from the ancestor,
+	 * use that one.
+	 */
+	if (!ancestor) {
+		if (ours == GIT_FILEMODE_BLOB_EXECUTABLE ||
+			theirs == GIT_FILEMODE_BLOB_EXECUTABLE)
+			return GIT_FILEMODE_BLOB_EXECUTABLE;
+
+		return GIT_FILEMODE_BLOB;
+	} else if (ours && theirs) {
+		if (ancestor == ours)
+			return theirs;
+
+		return ours;
+	}
+
+	return 0;
+}
+
+#endif