1 files changed, 9 insertions, 2 deletions

diff --git a/shared.c b/shared.c
index 0a6a5ed..3d4feea 100644
--- a/shared.c
+++ b/shared.c
@@ -386,10 +386,11 @@ int cgit_diff_files(const unsigned char *old_sha1,
 
 void cgit_diff_tree(const unsigned char *old_sha1,
                     const unsigned char *new_sha1,
-                    filepair_fn fn)
+                    filepair_fn fn, const char *prefix)
 {
         struct diff_options opt;
         int ret;
+        int prefixlen;
 
         diff_setup(&opt);
         opt.output_format = DIFF_FORMAT_CALLBACK;
@@ -398,6 +399,12 @@ void cgit_diff_tree(const unsigned char *old_sha1,
         opt.recursive = 1;
         opt.format_callback = cgit_diff_tree_cb;
         opt.format_callback_data = fn;
+        if (prefix) {
+                opt.nr_paths = 1;
+                opt.paths = &prefix;
+                prefixlen = strlen(prefix);
+                opt.pathlens = &prefixlen;
+        }
         diff_setup_done(&opt);
 
         if (old_sha1 && !is_null_sha1(old_sha1))
@@ -414,5 +421,5 @@ void cgit_diff_commit(struct commit *commit, filepair_fn fn)
 
         if (commit->parents)
                 old_sha1 = commit->parents->item->object.sha1;
-        cgit_diff_tree(old_sha1, commit->object.sha1, fn);
+        cgit_diff_tree(old_sha1, commit->object.sha1, fn, NULL);
 }