Processwire module to add angularjs to all pages

PwAngular.module

<?php

/**
 * ProcessWire 'Hello world' demonstration module
 *
 * Demonstrates the Module interface and how to add hooks.
 * 
 * See README file for further links regarding module development.
 * 
 * ProcessWire 2.x 
 * Copyright (C) 2014 by Ryan Cramer 
 * Licensed under GNU/GPL v2, see LICENSE.TXT
 * 
 * http://processwire.com
 *
 */

class PwAngular extends WireData implements Module, ConfigurableModule {

	/**
	 * getModuleInfo is a module required by all modules to tell ProcessWire about them
	 *
	 * @return array
	 *
	 */
	public static function getModuleInfo() {

		return array(

			// The module'ss title, typically a little more descriptive than the class name
			'title' => 'PW and AngularJS', 

			// version number 
			'version' => 3, 

			// summary is brief description of what this module is
			'summary' => 'a clean way to use angularjs + API to use PW in javascript',
			
			// Optional URL to more information about the module
			'href' => 'http://processwire.com',

			// singular=true: indicates that only one instance of the module is allowed.
			// This is usually what you want for modules that attach hooks. 
			'singular' => true, 

			// autoload=true: indicates the module should be started with ProcessWire.
			// This is necessary for any modules that attach runtime hooks, otherwise those
			// hooks won't get attached unless some other code calls the module on it's own.
			// Note that autoload modules are almost always also 'singular' (seen above).
			'autoload' => true, 
		
			// Optional font-awesome icon name, minus the 'fa-' part
			'icon' => 'smile-o', 
			);
	}

	/**
	 * Initialize the module
	 *
	 * ProcessWire calls this when the module is loaded. For 'autoload' modules, this will be called
	 * when ProcessWire's API is ready. As a result, this is a good place to attach hooks. 
	 *
	 */
	public function init() {

		// add a hook after each page is rendered and modify the output
		$this->addHookAfter('Page::render', $this, 'addAngular'); 
		$this->addHook('Page::getPage', $this, 'getPage');
		$this->addHook('Page::getChildren', $this, 'getChildren');

	}

    public static function getModuleConfigInputfields(array $data) {
        $inputfields = new InputfieldWrapper(); 
 
        // ask for their full name
        $field = wire('modules')->get('InputfieldTextarea');
        $field->name = 'scripts';
        $field->label = "Enter scripts";
        $field->description = '<script src="https://code.angularjs.org/1.3.2/angular-sanitize.min.js"></script>  <script src="http://cdn.jsdelivr.net/angular.ngtable/0.3.3/ng-table.js"></script> ';
        if(isset($data['scripts'])) $field->value = $data['scripts'];
        $inputfields->add($field); 
  
        // ask for their full name
        $field = wire('modules')->get('InputfieldText');
        $field->name = 'injector';
        $field->label = "Enter injector names";
        $field->description = "'ngSanitize','ngTable'";
        if(isset($data['injector'])) $field->value = $data['injector'];
        $inputfields->add($field); 
 
 
        return $inputfields; 
    }

	/**
	 * addAngular 
	 *
	 */
	public function addAngular($event) {

		$page = $event->object; 

		// don't add this to the admin pages
		if($page->template == 'admin') return;

		// 1.- add angular 
		
		$angular =  '<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>';
		// $angular .= '<script src="https://code.angularjs.org/1.3.2/angular-sanitize.min.js"></script>';
		$angular .= $this->scripts;
		$angular .= "<script>var app = angular.module('myApp', [{$this->injector}])</script>";
		$angular .=	"</head>";
					
		$event->return = str_replace("</head>", $angular, $event->return); 

		// 2.- add ng-app="myApp" to body tag
		$body = "<body";
		$bodypos = strpos($body, "<body");
		$bodypos_end = $bodypos + strlen("<body");
		$newbody = substr_replace($body, ' ng-app="myApp" ', $bodypos_end, 0);
		$event->return = str_replace("<body", $newbody, $event->return); 

		// 3.- add $page data to var = page (php -> javascript) 
		// $script =
		// 	"<script>".
		// 		"app.controller('especialidadesCtrl', function (\$scope) {".
		// 		  	"\$scope.children = [];".			
		// 		  	// "$scope.children = ". wire('page')->children.
		// 		  	"\$scope.children = 'hi there' ".
		// 		"});".
		// 	"</script>".
		// 	"</body>";	
		// $event->return = str_replace("</body>", $script, $event->return); 		

	}

	public function getPage($event) {

		// A - returns children of actual page
		$pagina = $event->object; 

	    // B - returns children of page with certain ID
		if (is_int($event->arguments[0])) { $pagina->id = $event->arguments[0]; }
		

		$array = array(); 
        // fields to be avoided
        $avoid = array("FieldtypeFieldsetOpen", "FieldtypeFieldsetClose","FieldtypeFieldsetTabOpen","FieldtypeFieldsetTabClose");
		$array['id'] = $pagina->id;
		
		foreach($pagina->fields as $field) {
			if (!in_array($field->type, $avoid)) {
				// si el campo no esta vacio
				if( htmlspecialchars($pagina->get($field->name)) )
					if($field->type == "FieldtypePage"){
							$buscar = htmlspecialchars($pagina->get($field->name));
							$paginas = $pages->get($buscar); 
							$array[$field->name] = $paginas->title;
						
				}
				else {
					$array[$field->name] = htmlspecialchars($pagina->get($field->name));
				}
			}
		}

		$event->return = json_encode($array);
	}
	
	public function getChildren($event) {
		
		// A - returns children of actual page
		$pagina = $event->object; 

	    // B - returns children of page with certain ID
		if (is_int($event->arguments[0])) { $pagina->id = $event->arguments[0]; }

	    $paginas = $pagina->children;

		// C - return pages that fit selector ex 'template=product'
		if (is_string($event->arguments[0])) { 
			$selector = $event->arguments[0]; 
			$paginas = wire('pages')->find($selector);
		}
		
		

	    // fields to be avoided
	    $avoid = array("FieldtypeFieldsetOpen", "FieldtypeFieldsetClose","FieldtypeFieldsetTabOpen","FieldtypeFieldsetTabClose");
	    // fields that must be returned
	    $wanted = $fields;
	 
	 
		$arr = array(); 
	    foreach ($paginas as $child) {
	 
			$array = array(); 
	 
			foreach($child->fields as $field) {
	 
				$array['id'] = $child->id;
	 
				// if we dont' want all fields back
				if (  !in_array($field->type, $avoid)   &&   in_array($field->name, $wanted) && (count($wanted)>0) ) {
					$array[$field->name] = htmlspecialchars($child->get($field->name));
				}
	 
				// we want all fields back
				if (  !in_array($field->type, $avoid) && (count($wanted)==0) ) {
					$array[$field->name] = htmlspecialchars($child->get($field->name));
				}			
	 
			}
			array_push($arr, $array);
	    }
	 

		$event->return = json_encode($arr);
	}
	
}