cgit

diff --git a/cgit.h b/cgit.h
index e3d9cb875171de19c098e79f8b19231e37aba5b2..5ef0bc5336f3099ba003b85b5b5eeb84806f9f21 100644
--- a/cgit.h
+++ b/cgit.h
@@ -170,7 +170,7 @@ 			   linediff_fn fn);
 
 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 0a6a5eda80884e5912a2b1fb463f50617ad006d0..3d4feeac2e415db10405f7f81eac3658f1d17b5b 100644
--- a/shared.c
+++ b/shared.c
@@ -386,10 +386,11 @@ }
 
 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 @@ 	opt.rename_limit = cgit_renamelimit;
 	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 @@ 	unsigned char *old_sha1 = NULL;
 
 	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 0be845fa41241656e936c2cab4704663c61fa66f..11a2ff8b96744d62cb477de1a72d4a38f9a559cd 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -131,10 +131,9 @@ 		commit2 = lookup_commit_reference(sha2);
 		if (!commit2 || parse_commit(commit2))
 			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>");
 }