How can I access the current template name in Mojolicious?

Question

I'd like to access the template name in Mojolicious from inside the template itself for debugging purposes, in the same way the Template Toolkit does (see here)

The variable __FILE__ works neatly but it refers to the current file and not to the top level template, which means it's useless inside a layout template.

I've also tried

<%= app->renderer->template_name %>

but no result

Is it possible at all in Mojolicious?

Napoli

In groups.google.com/forum/#!topic/mojolicious/f1SLFXSGRVk sri suggests to use <%= __FILE__ %>. – Expertize

@Expertize it does not work if used in a wrapper template (layout) - see the question – Napoli

Sri also calls doing this a code smell in the thread. It seems they haven't implemented anything that allows you to do it by now. – Expertize

Answer 1

This can be done in two slightly different ways:

First by adding a before_render hook and setting a variable. It's easy to pack it all inside a plugin like so:

package Mojolicious::Plugin::TemplateName;

use Mojo::Base 'Mojolicious::Plugin';

sub register {
    my ($self, $app, $conf) = @_;

    $app->helper('template' => sub { return shift->stash('mojo.template') });
    $app->hook(before_render => sub {
           my $c = shift;
           $c->stash('mojo.template', $_[0]->{template} )
           });
}

1;

and use it inside a template like this

<%= template %>

Second, it can be done inside the templates - by setting the variable inside the template itself:

% stash('template', __FILE__);

and then reusing the variable in the layout:

<%= $template %>        

In this case you get the file name with suffix and all - not just the template.

Inspired by the answer here about templates being rendered inside-out.

Napoli