Add support for .jst.eco assets when the eco gem is installed

lib/sprockets/eco_template.rb

@@ -0,0 +1,20 @@
+require 'tilt'
+
+module Sprockets
+  class EcoTemplate < Tilt::Template
+    def self.default_mime_type
+      'application/javascript'
+    end
+
+    def initialize_engine
+      require_template_library 'eco'
+    end
+
+    def prepare
+    end
+
+    def evaluate(scope, locals, &block)
+      Eco.compile(data)
+    end
+  end
+end

lib/sprockets/engines.rb

@@ -1,3 +1,4 @@
+require 'sprockets/eco_template'
 require 'sprockets/ejs_template'
 require 'sprockets/jst_processor'
 require 'sprockets/utils'
@@ -28,8 +29,9 @@ def register_engine(ext, klass)
   extend Engines
 
   register_engine '.coffee', Tilt::CoffeeScriptTemplate
-  register_engine '.erb',    Tilt::ERBTemplate
+  register_engine '.eco',    EcoTemplate
   register_engine '.ejs',    EjsTemplate
+  register_engine '.erb',    Tilt::ERBTemplate
   register_engine '.jst',    JstProcessor
   register_engine '.less',   Tilt::LessTemplate
   register_engine '.sass',   Tilt::SassTemplate

sprockets.gemspec

@@ -11,6 +11,7 @@ Gem::Specification.new do |s|
   s.add_dependency "tilt", ["~> 1.1", "!= 1.3.0"]
 
   s.add_development_dependency "coffee-script", "~> 2.0"
+  s.add_development_dependency "eco", "~> 1.0"
   s.add_development_dependency "ejs", "~> 1.0"
   s.add_development_dependency "execjs", "~> 1.0"
   s.add_development_dependency "json"

test/fixtures/default/goodbye.jst.eco

@@ -0,0 +1 @@
+Goodbye <%= @name %>

test/test_environment.rb

@@ -51,9 +51,16 @@ def self.test(name, &block)
     end
   end
 
+  test "eco templates" do
+    asset = @env["goodbye.jst"]
+    context = ExecJS.compile("var window = this; #{asset}")
+    assert_equal "Goodbye world\n", context.call("JST['goodbye']", :name => "world")
+  end
+
   test "ejs templates" do
     asset = @env["hello.jst"]
-    assert_equal "window.JST || (window.JST = {});\nwindow.JST[\"hello\"] = function(obj){var __p=[],print=function(){__p.push.apply(__p,arguments);};with(obj||{}){__p.push('hello: ', name ,'\\n');}return __p.join('');};\n", asset.to_s
+    context = ExecJS.compile("var window = this; #{asset}")
+    assert_equal "hello: world\n", context.call("JST['hello']", :name => "world")
   end
 
   test "lookup mime type" do