Implement `template' task keyword

features/task_template.feature

@@ -0,0 +1,27 @@
+Feature: `template' task keyword
+
+  Background:
+    Given a file named "basic.erb" with:
+      """
+      basic template
+      """
+    Given a file named "variables.erb" with:
+      """
+      <%= @foo %>
+      """
+
+  Scenario: renders an ERB template file
+    Given a recipe with:
+      """
+      task(:echo_template) { echo template 'basic' }
+      """
+    When I execute the recipe
+    Then the output must contain "basic template"
+
+  Scenario: renders ERB with given attributes as member data
+    Given a recipe with:
+      """
+      task(:echo_template) { echo template('variables', foo: 'bar') }
+      """
+    When I execute the recipe
+    Then the output must contain "bar"

lib/producer/core.rb

@@ -1,3 +1,4 @@
+require 'erb'
 require 'etc'
 require 'forwardable'
 require 'optparse'

lib/producer/core/task.rb

@@ -57,6 +57,25 @@ module Producer
       def get(key)
         @env[key]
       end
+
+      def template(path, variables = {})
+        path = "#{path}.erb"
+        tpl = ERB.new(File.read(path), nil, '-')
+        tpl.filename = path
+        tpl.result build_erb_binding variables
+      end
+
+
+      private
+
+      def build_erb_binding(variables)
+        Object.new.instance_eval do |o|
+          variables.each do |k, v|
+            o.instance_variable_set "@#{k}", v
+          end
+          binding
+        end
+      end
     end
   end
 end