From 2e8db2ff104b43fa36363cf6f0b597ce02a41e39 Mon Sep 17 00:00:00 2001
From: Gordon Heydon <gordon@heydon.com.au>
Date: Tue, 5 Mar 2019 15:20:46 +1100
Subject: [PATCH 1/3] Create some handy twig global variables and functions to
 assist with theming.

---
 domain/domain.services.yml   |  5 ++++
 domain/src/TwigExtension.php | 56 ++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 domain/src/TwigExtension.php

diff --git a/domain/domain.services.yml b/domain/domain.services.yml
index 8b87c6a5..c7f6460f 100644
--- a/domain/domain.services.yml
+++ b/domain/domain.services.yml
@@ -39,3 +39,8 @@ services:
   domain.loader:
     class: Drupal\domain\DomainLoader
     arguments: ['@config.typed', '@config.factory']
+  domain.twig_extension:
+    class: Drupal\domain\TwigExtension
+    arguments: ['@domain.negotiator']
+    tags:
+      - {name: twig.extension}
diff --git a/domain/src/TwigExtension.php b/domain/src/TwigExtension.php
new file mode 100644
index 00000000..d655fed1
--- /dev/null
+++ b/domain/src/TwigExtension.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace Drupal\domain;
+
+/**
+ * Class TwigExtension
+ *
+ * @package Drupal\domain
+ */
+class TwigExtension extends \Twig_Extension {
+
+  /**
+   * @var \Drupal\domain\DomainNegotiatorInterface
+   */
+  protected $domainNegotiator;
+
+  /**
+   * TwigExtension constructor.
+   *
+   * @param \Drupal\domain\DomainNegotiatorInterface $domainNegotiator
+   *   Domain negotiator to work out the current domain.
+   */
+  public function __construct(DomainNegotiatorInterface $domainNegotiator) {
+    $this->domainNegotiator = $domainNegotiator;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getGlobals() {
+    return [
+      'domain_active' => $this->domainNegotiator->getActiveDomain(),
+      'domain_active_id' => $this->domainNegotiator->getActiveId(),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFunctions() {
+    new \Twig_SimpleFunction('is_domain', [$this, 'isDomain']);
+  }
+
+  /**
+   * Check of the current domain id.
+   *
+   * @param $domain_id
+   *   Id of the domain to check.
+   *
+   * @return bool
+   *   if the id passed in a the current domain.
+   */
+  public function isDomain($domain_id) {
+    return $this->domainNegotiator->getActiveId() == $domain_id;
+  }
+}
\ No newline at end of file

From ca85655b4f401d458d66a7af14ce8d9c760e1b90 Mon Sep 17 00:00:00 2001
From: Gordon Heydon <gordon@heydon.com.au>
Date: Tue, 12 Mar 2019 23:52:45 +1100
Subject: [PATCH 2/3] Fix up issue when there are no domains configured.

---
 domain/src/TwigExtension.php | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/domain/src/TwigExtension.php b/domain/src/TwigExtension.php
index d655fed1..7d5b48c9 100644
--- a/domain/src/TwigExtension.php
+++ b/domain/src/TwigExtension.php
@@ -28,10 +28,15 @@ public function __construct(DomainNegotiatorInterface $domainNegotiator) {
    * {@inheritdoc}
    */
   public function getGlobals() {
-    return [
-      'domain_active' => $this->domainNegotiator->getActiveDomain(),
-      'domain_active_id' => $this->domainNegotiator->getActiveId(),
-    ];
+    if ($domain = $this->domainNegotiator->getActiveDomain()) {
+      return [
+        'domain_active' => $domain,
+        'domain_active_id' => $domain->id(),
+      ];
+    }
+    else {
+      return [];
+    }
   }
 
   /**

From 48dc11709e64c56575078705938765ea35d49ea2 Mon Sep 17 00:00:00 2001
From: Gordon Heydon <gordon@heydon.com.au>
Date: Thu, 12 Sep 2019 15:17:00 +1000
Subject: [PATCH 3/3] Fix up the return from ::getFunctions() to be an array.

---
 domain/src/TwigExtension.php | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/domain/src/TwigExtension.php b/domain/src/TwigExtension.php
index 7d5b48c9..f0489a5d 100644
--- a/domain/src/TwigExtension.php
+++ b/domain/src/TwigExtension.php
@@ -43,7 +43,9 @@ public function getGlobals() {
    * {@inheritdoc}
    */
   public function getFunctions() {
-    new \Twig_SimpleFunction('is_domain', [$this, 'isDomain']);
+    return [
+      new \Twig_SimpleFunction('is_domain', [$this, 'isDomain']),
+    ];
   }
 
   /**
@@ -58,4 +60,4 @@ public function getFunctions() {
   public function isDomain($domain_id) {
     return $this->domainNegotiator->getActiveId() == $domain_id;
   }
-}
\ No newline at end of file
+}