3 files changed, 11 insertions, 5 deletions

diff --git a/cgit.h b/cgit.h
index e3d9cb8..5ef0bc5 100644
--- a/cgit.h
+++ b/cgit.h
@@ -171,5 +171,5 @@ extern int cgit_diff_files(const unsigned char *old_sha1,
 extern void cgit_diff_tree(const unsigned char *old_sha1,
                            const unsigned char *new_sha1,
-                           filepair_fn fn);
+                           filepair_fn fn, const char *prefix);
 
 extern void cgit_diff_commit(struct commit *commit, filepair_fn fn);
diff --git a/shared.c b/shared.c
index 0a6a5ed..3d4feea 100644
--- a/shared.c
+++ b/shared.c
@@ -387,8 +387,9 @@ 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);
@@ -399,4 +400,10 @@ void cgit_diff_tree(const unsigned char *old_sha1,
         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);
 
@@ -415,4 +422,4 @@ 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);
 }
diff --git a/ui-diff.c b/ui-diff.c
index 0be845f..11a2ff8 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -132,8 +132,7 @@ void cgit_print_diff(const char *new_rev, const char *old_rev)
                         cgit_print_error(fmt("Bad commit: %s", sha1_to_hex(sha2)));
         }
-
         html("<table class='diff'>");
         html("<tr><td>");
-        cgit_diff_tree(sha2, sha1, filepair_cb);
+        cgit_diff_tree(sha2, sha1, filepair_cb, NULL);
         html("</td></tr>");
         html("</table>");