From eca537347f26f83ff53df5f3edeea654e6a925a0 Mon Sep 17 00:00:00 2001
From: Abram Booth <abram@cos.io>
Date: Thu, 17 May 2018 16:14:40 -0400
Subject: [PATCH] Add support for routable engines

Make {{href-to}} behave the same as {{link-to}} within an engine,
automatically prefixing routes with the engine's namespace

Add {{href-to-external}}, for routes external to the engine.
---
 addon/helpers/href-to-external.js | 22 ++++++++++++++++++++++
 addon/helpers/href-to.js          | 14 ++++++++++++--
 2 files changed, 34 insertions(+), 2 deletions(-)
 create mode 100644 addon/helpers/href-to-external.js

diff --git a/addon/helpers/href-to-external.js b/addon/helpers/href-to-external.js
new file mode 100644
index 0000000..b5f67ff
--- /dev/null
+++ b/addon/helpers/href-to-external.js
@@ -0,0 +1,22 @@
+import Helper from '@ember/component/helper';
+import { getOwner } from '@ember/application';
+import { getHrefFromOwner } from './href-to';
+
+function hrefToExternal(context, targetRouteName, ...rest) {
+  const owner = getOwner(context);
+
+  if(owner.mountPoint) {
+    targetRouteName = owner._getExternalRoute(targetRouteName);
+  }
+  return getHrefFromOwner(owner, targetRouteName, ...rest);
+}
+
+export default Helper.extend({
+  compute([targetRouteName, ...rest], namedArgs) {
+    if(namedArgs.params) {
+      return hrefToExternal(this, ...namedArgs.params);
+    } else {
+      return hrefToExternal(this, targetRouteName, ...rest);
+    }
+  }
+});
diff --git a/addon/helpers/href-to.js b/addon/helpers/href-to.js
index ac18bfd..ae808b2 100644
--- a/addon/helpers/href-to.js
+++ b/addon/helpers/href-to.js
@@ -2,7 +2,17 @@ import Helper from '@ember/component/helper';
 import { getOwner } from '@ember/application';
 
 function hrefTo(context, targetRouteName, ...rest) {
-  let router = getOwner(context).lookup('service:router');
+  let owner = getOwner(context);
+
+  // If used in an engine, namespace the route
+  if(owner.mountPoint && targetRouteName !== 'application') {
+    targetRouteName = `${owner.mountPoint}.${targetRouteName}`;
+  }
+  return getHrefFromOwner(owner, targetRouteName, ...rest);
+}
+
+function getHrefFromOwner(owner, targetRouteName, ...rest) {
+  let router = owner.lookup('service:router');
 
   if(router === undefined) {
     return;
@@ -22,7 +32,7 @@ function hrefTo(context, targetRouteName, ...rest) {
   return router.urlFor.apply(router, args);
 }
 
-export { hrefTo };
+export { hrefTo, getHrefFromOwner };
 
 export default Helper.extend({
   compute([targetRouteName, ...rest], namedArgs) {