Jade Template Plugin Draft for F3

index.php

<?php

$app=require __DIR__.'/lib/base.php';

$app->set('AUTOLOAD','inc/;inc/temp/');
$app->set('CACHE',FALSE);
$app->set('DEBUG',3);
$app->set('EXTEND',TRUE);
$app->set('GUI','gui/');
$app->set('PROXY',TRUE);
$app->set('TEMP','temp/');

$app->route('GET /haml',
    function() use($app) {
        $app->set('headline','a very cool headline');
        $app->set('foo',array('one','two','three'));
        echo TemplateExt::serve('test.jade');
    }
);

$app->run();

templateext.php

<?php

/**
    Template Extension for the PHP Fat-Free Framework

    The contents of this file are subject to the terms of the GNU General
    Public License Version 3.0. You may not use this file except in
    compliance with the license. Any of the license terms and conditions
    can be waived if you get permission from the copyright holder.

        @package Template
        @version 0.1.0
 **/

require(__DIR__.'/ext/everzet-jade.php-e57fce6/autoload.php.dist');

use Everzet\Jade\Jade;
use Everzet\Jade\Parser;
use Everzet\Jade\Lexer\Lexer;
use Everzet\Jade\Dumper\PHPDumper;
use Everzet\Jade\Visitor\AutotagsVisitor;

use Everzet\Jade\Filter\JavaScriptFilter;
use Everzet\Jade\Filter\CDATAFilter;
use Everzet\Jade\Filter\PHPFilter;
use Everzet\Jade\Filter\CSSFilter;


class TemplateExt extends Template {

    //@{ Locale-specific error/exception messages
    const
        TEXT_Render='Template %s cannot be rendered';
    //@}

    static function serve($file, $mime='text/html',$globals=TRUE,$syms=array()) {


        // Parse jade template
        // bootstrap jade
        $dumper = new PHPDumper();
        $dumper->registerVisitor('tag', new AutotagsVisitor());
        $dumper->registerFilter('javascript', new JavaScriptFilter());
        $dumper->registerFilter('cdata', new CDATAFilter());
        $dumper->registerFilter('php', new PHPFilter());
        $dumper->registerFilter('style', new CSSFilter());

        // Initialize parser & Jade
        $parser = new Parser(new Lexer());
        $jade   = new Jade($parser, $dumper);

        // resolve F3 Markup
        $template = parent::serve($file,$mime,$globals,$syms);

        // Parse a template (both string & file containers)
        return $jade->render($template);
    }

}

test.jade

!!! 5
head
  title HAML like Template Test with jade.php
body
  #header
    h1 {{@headline}}    
    
 <repeat group="{{@foo}}" value="{{@val}}">
   p nice paragraph {{@val}}
    	
 </repeat>
    
    p end

well, F3 also supports a shorter Tag.

you can simply use < repeat > or < include >, no need to prefix it with F3. maybe it's easier than.
i updated the gist. in this order, mixing Tags and jade will work, but is pretty ugly. using {{}} in jade calls direct php rendering. and F3's template rendering returns some indentiations that breaks jade. so hacking the jade libs is needed i think.

@ikkez u need to update your GFM above. there's a syntax error that hid a portion of it. but yes, when i can i will look into hacking the jade lib.

Also, I wasn't aware of the short versions of thetags. That's interesting, though IDT f3: is a huge deal to type and its good for clarity + readability, I think. Esp. if one is using arbitrary and custom XML tags that may clash with f3's.