Use php-pug with Slim3

dependencies.php

<?php                                                                                                                    
// DIC configuration                                                                                                     
                                                                                                                         
$container = $app->getContainer();                                                                                       
                                                                                                                         
$container['renderer'] = function ($c) {                                                                                 
    $settings = $c->get('settings')['renderer'];                                                                         
    return new \Renderers\PugRenderer($settings);                                                                        
}; 

index.php

<?php                                                                                                                       
if (PHP_SAPI == 'cli-server') {                                                                                             
    // To help the built-in PHP dev server, check if the request was actually for                                           
    // something which should probably be served as a static file                                                           
    $url  = parse_url($_SERVER['REQUEST_URI']);                                                                             
    $file = __DIR__ . $url['path'];                                                                                         
    if (is_file($file)) {                                                                                                   
        return false;                                                                                                       
    }                                                                                                                       
}                                                                                                                           
                                                                                                                            
require __DIR__ . '/../vendor/autoload.php';                                                                                
                                                                                                                            
session_start();                                                                                                            
                                                                                                                            
// Instantiate the app                                                                                                      
$settings = require __DIR__ . '/../src/settings.php';                                                                       
$app = new \Slim\App($settings);                                                                                            
                                                                                                                            
// Set up dependencies                                                                                                      
require __DIR__ . '/../src/dependencies.php';                                                                               
                                                                                                                                                                                                                                                        
// Register routes                                                                                                       
require __DIR__ . '/../src/routes.php';                                                                                  
                                                                                                                         
// Run app                                                                                                               
$app->run();       

pugrenderer.php

<?php                                                                                                                       
namespace Renderers;                                                                                                        
use \Pug\Pug as Pug;                                                                                                        
                                                                                                                            
class PugRenderer {                                                                                                         
    private $mPath;
    private $mPug;
    public function __construct($settings) {                                                                                
        $this->mPath = $settings['template_path'];                                                                          
                                                                                                                            
        $this->mPug = new Pug(array(                                                                                               
            'prettyprint' => true,                                                                                          
            'extension' => '.pug',                                                                                          
            //'cache' => '../cache/'                                                                                        
        ));                                                                                                                 
    }                                                                                                                       
    public function render($response, $file, $data) {                                                                       
        $filepath = $this->mPath . $file;                                                                                   
        $body = $response->getBody();                                                                                       
        $body->write($this->mPug->render($filepath, $data));                                                                 
    }                                                                                                                                                                                                                                             
}  

routes.php

<?php                                                                                                                    
// Routes                                                                                                                
                                                                                                                         
$app->get('/[{name}]', function ($request, $response, $args) {                                                                                                                                                                                    
    // Render index view                                                                                                 
    return $this->renderer->render($response, 'index.pug', $args);                                                        
});    

settings.php

<?php                                                                                                                       
return [                                                                                                                    
    'settings' => [                                                                                                                                                                                                                             
        // Renderer settings                                                                                                
        'renderer' => [                                                                                                     
            'template_path' => __DIR__ . '/../templates/',                                                                  
        ],                                                                                                                                                                                                                                    
    ],                                                                                                                      
];