1 file changed, 22 insertions, 2 deletions
diff --git a/source/shared.h b/source/shared.h
index f182962..b24c690 100644
--- a/source/shared.h
+++ b/source/shared.h
@@ -25,8 +25,9 @@ extern struct cgit_repo *cgit_get_repoinfo(const char *url);
 
 /*
  * A diff format callback that hands each filepair to the filepair_fn data
- * points at. ISO C has no conversion between a function pointer and void *,
- * so the function travels by address.
+ * points at, or only the pair landing on single_follow when that is set. ISO
+ * C has no conversion between a function pointer and void *, so the function
+ * travels by address.
  */
 extern void cgit_diff_tree_cb(struct diff_queue_struct *q, struct diff_options *options, void *data);
 
@@ -45,6 +46,25 @@ extern int cgit_diff_files(const struct object_id *old_oid, const struct object_
  */
 extern void cgit_diff_limit_path(struct diff_options *opt, const char *prefix);
 
+/*
+ * Limit a diff to path and to source, the name it was renamed from, both
+ * taken literally, with rename detection on so that git pairs the two.
+ */
+extern void cgit_diff_limit_rename(struct diff_options *opt, const char *path, const char *source);
+
+/*
+ * The name path had in the old tree when the change between the two trees
+ * renamed it, or NULL when path is no renamed file's new name. The result is
+ * the caller's to free.
+ */
+extern char *cgit_rename_source(const struct object_id *old_oid, const struct object_id *new_oid,
+	const char *path);
+
+/*
+ * Hand fn each filepair between the two trees, limited to the paths below
+ * prefix when one is given. A prefix naming a file the old tree lacks still
+ * comes back as the rename that produced it.
+ */
 extern void cgit_diff_tree(const struct object_id *old_oid, const struct object_id *new_oid,
 	filepair_fn fn, const char *prefix, int ignorews);
 extern void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix);