ui-diff: emit table/tr/td at better locations

This fixes a bug which made the diff-link for each parent of a commit
output a diff without correct styles.

It also adds an error-message if the head commit specified on the querystring
isn't a valid commit object.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 7 insertions, 9 deletions

diff --git a/ui-diff.c b/ui-diff.c
index e6b957c..3c4d52a 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -75,68 +75,66 @@ static void header(unsigned char *sha1, char *path1, int mode1,
 }
 
 static void filepair_cb(struct diff_filepair *pair)
 {
 	header(pair->one->sha1, pair->one->path, pair->one->mode,
 	       pair->two->sha1, pair->two->path, pair->two->mode);
 	if (S_ISDIRLNK(pair->one->mode) || S_ISDIRLNK(pair->two->mode)) {
 		if (S_ISDIRLNK(pair->one->mode))
 			print_line(fmt("-Subproject %s", sha1_to_hex(pair->one->sha1)), 52);
 		if (S_ISDIRLNK(pair->two->mode))
 			print_line(fmt("+Subproject %s", sha1_to_hex(pair->two->sha1)), 52);
 		return;
 	}
 	if (cgit_diff_files(pair->one->sha1, pair->two->sha1, print_line))
 		cgit_print_error("Error running diff");
 }
 
 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;
 
+	html("<table class='diff'>");
+	html("<tr><td>");
+
 	if (head && !old_hex && !new_hex) {
 		get_sha1(head, sha1);
 		commit = lookup_commit_reference(sha1);
-		if (commit && !parse_commit(commit)) {
-			html("<table class='diff'>");
-			html("<tr><td>");
+		if (commit && !parse_commit(commit))
 			cgit_diff_commit(commit, filepair_cb);
-			html("</td></tr>");
-			html("</table>");
-		}
+		else
+			cgit_print_error(fmt("Bad commit: %s", head));
 		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, 0644, sha2, path, 0644);
 		if (cgit_diff_files(sha1, sha2, print_line))
 			cgit_print_error("Error running diff");
-		html("</td></tr>");
 		break;
 	case OBJ_TREE:
 		cgit_diff_tree(sha1, sha2, filepair_cb);
 		break;
 	default:
 		cgit_print_error(fmt("Unhandled object type: %s",
 				     typename(type)));
 		break;
 	}
+	html("</td></tr>");
 	html("</table>");
 }