Fixed bug that was crashing twin file generation

- also added better snippets for gen'd model, view, controller and
  helper classes

Support/lib/spec/mate/switch_command.rb

@@ -86,11 +86,37 @@ def content_for(file_type, relative_path)
         case file_type
           when /spec$/ then
             spec(relative_path)
+          when "controller"
+            <<-CONTROLLER
+class #{class_from_path(relative_path)} < ApplicationController
+end
+CONTROLLER
+          when "model"
+            <<-MODEL
+class #{class_from_path(relative_path)} < ActiveRecord::Base
+end
+MODEL
+          when "helper"
+            <<-HELPER
+module #{class_from_path(relative_path)}
+end
+HELPER
+          when "view"
+            ""
           else
             klass(relative_path)
         end
       end
 
+      def class_from_path(path)
+        underscored = path.split('/').last.split('.rb').first
+        parts = underscored.split('_')
+        parts.inject("") do |word, part|
+          word << part.capitalize
+          word
+        end
+      end
+
       # Extracts the snippet text
       def snippet(snippet_name)
         snippet_file = File.expand_path(File.dirname(__FILE__) + "/../../../../Snippets/#{snippet_name}")
@@ -106,9 +132,9 @@ def spec(path)
 SPEC
       end
 
-      def klass(relative_path)
+      def klass(relative_path, content=nil)
         parts = relative_path.split('/')
-        lib_index = parts.index('lib')
+        lib_index = parts.index('lib') || 0
         parts = parts[lib_index+1..-1]
         lines = Array.new(parts.length*2)
         parts.each_with_index do |part, n|

Support/spec/spec/mate/switch_command_spec.rb

@@ -196,6 +196,31 @@ def twin(expected)
           SwitchCommand.new.content_for('controller spec', "spec/controllers/mooky_controller_spec.rb").split("\n")[0].should == 
             "require 'spec_helper'"
         end
+
+        it "creates a controller if twinned from a controller spec" do
+          SwitchCommand.new.content_for('controller', "spec/controllers/mooky_controller.rb").should == <<-EXPECTED
+class MookyController < ApplicationController
+end
+EXPECTED
+        end
+
+        it "creates a model if twinned from a model spec" do
+          SwitchCommand.new.content_for('model', "spec/models/mooky.rb").should == <<-EXPECTED
+class Mooky < ActiveRecord::Base
+end
+EXPECTED
+        end
+
+        it "creates a helper if twinned from a helper spec" do
+          SwitchCommand.new.content_for('helper', "spec/helpers/mooky_helper.rb").should == <<-EXPECTED
+module MookyHelper
+end
+EXPECTED
+        end
+
+        it "creates an empty view if twinned from a view spec" do
+          SwitchCommand.new.content_for('view', "spec/views/mookies/index.html.erb_spec.rb").should == ""
+        end
       end
     end
   end