package MyProject::Sugar::Catalyst;

use Sub::Exporter -setup => {
	exports => [
		error_msg => \&_build_error_message,
	],
	groups => {
		default   => [qw/ error_msg /],
	},
};

sub _build_error_message
{
	my ($class, $name, $def) = @_;
	return sub
	{
		my ($c, %arg) = @_;
	
		my $uri = $arg{uri}
			|| $def->{uri}
			or die "No URI supplied";
		my $msg = $arg{msg}
			|| $def->{msg}
			|| 'Oh noes, ANOTHER FUCKING ERROR!!!';
		
		$c->res->redirect(
			$c->uri_for($uri, { mid => $c->set_error_msg($msg) })
		);
		$c->detach();
	}
}

##</code><code>##

package MyProject::Controller::Foobar;

use MyProject::Sugar::Catalyst
  db_error_msg   => { msg => "Database Error!" },
  http_error_msg => { msg => "HTTP Error!" },
  error_msg      => { };

...;

sub foo_bar
{
    ...;
    db_error_msg($c, uri => $uri);
}

sub foo_baz
{
    ...;
    db_error_msg($c, uri => $uri, msg => "specific error message");
}