From b03ec50a42b93d1c3c31715aa940811fc036743c Mon Sep 17 00:00:00 2001
From: Andy Choi <chunkerchunker@gmail.com>
Date: Wed, 30 Sep 2015 20:56:54 -0700
Subject: [PATCH] Allow Template.render() to be called multiple times

Allow Template.render() to be called multiple times, for the use case where a single template is rendered against multiple Contexts.
---
 README.md              | 2 ++
 Stencil/Template.swift | 8 ++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index efca766..5c60113 100644
--- a/README.md
+++ b/README.md
@@ -168,6 +168,8 @@ of template tags. You will need to call the `registerTag` API which accepts a
 closure to handle the parsing. You can find examples of the `now`, `if` and
 `for` tags found inside `Node.swift`.
 
+Custom template tags must be registered prior to calling `Template.render` the first time.
+
 The architecture of Stencil along with how to build advanced plugins can be found in the [architecture](ARCHITECTURE.md) document.
 
 ### Comments
diff --git a/Stencil/Template.swift b/Stencil/Template.swift
index 761c87b..ded50e2 100644
--- a/Stencil/Template.swift
+++ b/Stencil/Template.swift
@@ -4,6 +4,7 @@ import PathKit
 /// A class representing a template
 public class Template {
   public let parser:TokenParser
+  private var nodes:[NodeType]? = nil
 
   /// Create a template with the given name inside the main bundle
   public convenience init(named:String) throws {
@@ -42,7 +43,10 @@ public class Template {
 
   /// Render the given template
   public func render(context:Context? = nil) throws -> String {
-    let nodes = try parser.parse()
-    return try renderNodes(nodes, context ?? Context())
+    if nodes == nil {
+        nodes = try parser.parse()
+    }
+    
+    return try renderNodes(nodes!, context ?? Context())
   }
 }