From 2331b11a5299fa0e725b03ee7e5b33bb804c7e50 Mon Sep 17 00:00:00 2001
From: Kyle Fuller <kyle@fuller.li>
Date: Wed, 7 Dec 2016 22:32:31 +0000
Subject: [PATCH] fix: Allow overriding default filters/tags

---
 Sources/Environment.swift           |  2 +-
 Tests/StencilTests/FilterSpec.swift | 12 ++++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Sources/Environment.swift b/Sources/Environment.swift
index 7473fc3..d220bf8 100644
--- a/Sources/Environment.swift
+++ b/Sources/Environment.swift
@@ -7,7 +7,7 @@ public struct Environment {
   public init(loader: Loader? = nil, extensions: [Extension]? = nil, templateClass: Template.Type = Template.self) {
     self.templateClass = templateClass
     self.loader = loader
-    self.extensions = [DefaultExtension()] + (extensions ?? [])
+    self.extensions = (extensions ?? []) + [DefaultExtension()]
   }
 
   public func loadTemplate(name: String) throws -> Template {
diff --git a/Tests/StencilTests/FilterSpec.swift b/Tests/StencilTests/FilterSpec.swift
index 0422a8b..cc6e4fc 100644
--- a/Tests/StencilTests/FilterSpec.swift
+++ b/Tests/StencilTests/FilterSpec.swift
@@ -49,6 +49,18 @@ func testFilter() {
       try expect(try template.render(context)).toThrow(TemplateSyntaxError("No Repeat"))
     }
 
+    $0.it("allows you to override a default filter") {
+      let template = Template(templateString: "{{ name|join }}")
+
+      let repeatExtension = Extension()
+      repeatExtension.registerFilter("join") { (value: Any?) in
+        return "joined"
+      }
+
+      let result = try template.render(Context(dictionary: context, environment: Environment(extensions: [repeatExtension])))
+      try expect(result) == "joined"
+    }
+
     $0.it("allows whitespace in expression") {
       let template = Template(templateString: "{{ name | uppercase }}")
       let result = try template.render(Context(dictionary: ["name": "kyle"]))