From af369e4bc890ceac2ebb702a650f225250d0bf3b Mon Sep 17 00:00:00 2001
From: Salem Ghoweri <salem.ghoweri@pega.com>
Date: Sat, 4 Nov 2017 14:20:18 -0400
Subject: [PATCH] feat: proof of concept implementation of adding Twig
 extension support for global variablesf, allowing for cross-platform
 interoperability. Addresses #46

---
 .../Twig/Loaders/FilesystemLoader.php         |  1 +
 .../Twig/Loaders/PatternLoader.php            |  1 +
 .../Twig/Loaders/StringLoader.php             |  1 +
 .../PatternEngine/Twig/TwigUtil.php           | 46 ++++++++++++++++++-
 4 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/src/PatternLab/PatternEngine/Twig/Loaders/FilesystemLoader.php b/src/PatternLab/PatternEngine/Twig/Loaders/FilesystemLoader.php
index 38f99bd..93c9832 100644
--- a/src/PatternLab/PatternEngine/Twig/Loaders/FilesystemLoader.php
+++ b/src/PatternLab/PatternEngine/Twig/Loaders/FilesystemLoader.php
@@ -52,6 +52,7 @@ public function __construct($options = array()) {
 		TwigUtil::setInstance($instance);
 		TwigUtil::loadFilters();
 		TwigUtil::loadFunctions();
+		TwigUtil::loadGlobals();
 		TwigUtil::loadTags();
 		TwigUtil::loadTests();
 		TwigUtil::loadDateFormats();
diff --git a/src/PatternLab/PatternEngine/Twig/Loaders/PatternLoader.php b/src/PatternLab/PatternEngine/Twig/Loaders/PatternLoader.php
index fa2ce2f..326eba8 100644
--- a/src/PatternLab/PatternEngine/Twig/Loaders/PatternLoader.php
+++ b/src/PatternLab/PatternEngine/Twig/Loaders/PatternLoader.php
@@ -94,6 +94,7 @@ public function __construct($options = array()) {
 		TwigUtil::setInstance($instance);
 		TwigUtil::loadFilters();
 		TwigUtil::loadFunctions();
+		TwigUtil::loadGlobals();
 		TwigUtil::loadTags();
 		TwigUtil::loadTests();
 		TwigUtil::loadDateFormats();
diff --git a/src/PatternLab/PatternEngine/Twig/Loaders/StringLoader.php b/src/PatternLab/PatternEngine/Twig/Loaders/StringLoader.php
index e81c9b7..ce1e917 100644
--- a/src/PatternLab/PatternEngine/Twig/Loaders/StringLoader.php
+++ b/src/PatternLab/PatternEngine/Twig/Loaders/StringLoader.php
@@ -58,6 +58,7 @@ public function __construct($options = array()) {
 		TwigUtil::setInstance($instance);
 		TwigUtil::loadFilters();
 		TwigUtil::loadFunctions();
+		TwigUtil::loadGlobals();
 		TwigUtil::loadTags();
 		TwigUtil::loadTests();
 		TwigUtil::loadDateFormats();
diff --git a/src/PatternLab/PatternEngine/Twig/TwigUtil.php b/src/PatternLab/PatternEngine/Twig/TwigUtil.php
index 64f97da..ad20281 100644
--- a/src/PatternLab/PatternEngine/Twig/TwigUtil.php
+++ b/src/PatternLab/PatternEngine/Twig/TwigUtil.php
@@ -244,7 +244,51 @@ public static function loadMacros() {
 		}
 		
 	}
-	
+
+
+	/**
+	* Load Twig Globals for the Twig PatternEngine
+	*/
+	public static function loadGlobals() {
+
+		// load defaults
+		$globalDir = Config::getOption("sourceDir").DIRECTORY_SEPARATOR."_twig-components/globals";
+		$globalExt = Config::getOption("twigGlobalExt");
+		$globalExt = $globalExt ? $globalExt : "global.php";
+
+		if (is_dir($globalDir)) {
+
+			// loop through the global dir...
+			$finder = new Finder();
+			$finder->files()->name("*\.".$globalExt)->in($globalDir);
+			$finder->sortByName();
+			foreach ($finder as $file) {
+
+				// see if the file should be ignored or not
+				$baseName = $file->getBasename();
+				if ($baseName[0] != "_") {
+
+					include_once($file->getPathname());
+
+					$twigExtensionName = 'Twig_Extension_' . $file->getBasename('.' . $globalExt);
+					$twigExtensionName = str_replace('-', '_', $twigExtensionName); //Replace dashes with underscores for Class name
+
+					$extension = new $twigExtensionName('xyz');
+					$globals = $extension->getGlobals();
+
+					if (isset($globals)) {
+						// If global Twig values exist, loop through and add to Pattern Lab
+						foreach ($globals as $name => $value) {
+							self::$instance->addGlobal($name, $value);
+						}
+						unset($globals);
+					}
+				}
+			}
+		}
+	}
+
+
 	/**
 	* Load tags for the Twig PatternEngine
 	*/