1 files changed, 13 insertions, 1 deletions

diff --git a/ui-diff.c b/ui-diff.c
index 999b6f3..afe1c90 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -45,53 +45,65 @@ static void header(unsigned char *sha1, char *path1,
         html_txt(path1);
         html(" b/");
         html_txt(path2);
         abbrev1 = xstrdup(find_unique_abbrev(sha1, DEFAULT_ABBREV));
         abbrev2 = xstrdup(find_unique_abbrev(sha2, DEFAULT_ABBREV));
         htmlf("\nindex %s..%s", abbrev1, abbrev2);
         free(abbrev1);
         free(abbrev2);
         html("\n--- a/");
         html_txt(path1);
         html("\n+++ b/");
         html_txt(path2);
         html("</div>");
 }
 
 static void filepair_cb(struct diff_filepair *pair)
 {
         header(pair->one->sha1, pair->one->path,
                pair->two->sha1, pair->two->path);
         if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
                 cgit_print_error("Error running diff");
         html("</tr></td>");
 }
 
-void cgit_print_diff(const char *old_hex, const char *new_hex, char *path)
+void cgit_print_diff(const char *head, const char *old_hex, const char *new_hex, char *path)
 {
         unsigned char sha1[20], sha2[20];
         enum object_type type;
         unsigned long size;
+        struct commit *commit;
+
+        if (head && !old_hex && !new_hex) {
+                get_sha1(head, sha1);
+                commit = lookup_commit_reference(sha1);
+                if (commit && !parse_commit(commit)) {
+                        html("<table class='diff'>");
+                        cgit_diff_commit(commit, filepair_cb);
+                        html("</td></tr></table>");
+                }
+                return;
+        }
 
         get_sha1(old_hex, sha1);
         get_sha1(new_hex, sha2);
 
         type = sha1_object_info(sha1, &size);
         if (type == OBJ_BAD) {
                 type = sha1_object_info(sha2, &size);
                 if (type == OBJ_BAD) {
                         cgit_print_error(fmt("Bad object names: %s, %s", old_hex, new_hex));
                         return;
                 }
         }
 
         html("<table class='diff'>");
         switch(type) {
         case OBJ_BLOB:
                 html("<tr><td>");
                 header(sha1, path, sha2, path);
                 if (cgit_diff_files(sha1, sha2, print_line))
                         cgit_print_error("Error running diff");
                 html("</tr></td>");
                 break;
         case OBJ_TREE:
                 cgit_diff_tree(sha1, sha2, filepair_cb);