gitweb: Use config file for repository description and URLs

Allow to use configuration variable gitweb.description for repository
description if there is no $GIT_DIR/description file, and multivalued
configuration variable gitweb.url for URLs of a project (to clone or
fetch from) if there is no $GIT_DIR/cloneurl file.

While repository description is shown in the projects list page, so it
is better to use file and not config variable for performance, it is I
think better to use gitweb.url for URLs (as it is shown only on
project summary page).

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -1606,7 +1606,9 @@ sub git_get_path_by_hash {
 sub git_get_project_description {
 	my $path = shift;
 
-	open my $fd, "$projectroot/$path/description" or return undef;
+	$git_dir = "$projectroot/$path";
+	open my $fd, "$projectroot/$path/description"
+		or return git_get_project_config('description');
 	my $descr = <$fd>;
 	close $fd;
 	if (defined $descr) {
@@ -1618,7 +1620,11 @@ sub git_get_project_description {
 sub git_get_project_url_list {
 	my $path = shift;
 
-	open my $fd, "$projectroot/$path/cloneurl" or return;
+	$git_dir = "$projectroot/$path";
+	open my $fd, "$projectroot/$path/cloneurl"
+		or return wantarray ?
+		@{ config_to_multi(git_get_project_config('url')) } :
+		   config_to_multi(git_get_project_config('url'));
 	my @git_project_url_list = map { chomp; $_ } <$fd>;
 	close $fd;