extend an object, not open core class

lib/relish.rb

@@ -1,5 +1,3 @@
-require 'relish/core_ext'
-
 module Relish
   class << self
 

lib/relish/commands/base.rb

@@ -4,6 +4,7 @@
 require 'relish/helpers'
 require 'relish/options_file'
 require 'relish/commands/dsl'
+require 'relish/commands/param_methods'
 
 module Relish
   module Command
@@ -19,7 +20,7 @@ class Base
 
       def initialize(args = [])
         @args = clean_args(args)
-        @param = get_param
+        @param = get_param.extend(ParamMethods)
         @cli_options = Hash[*@args]
 
         validate_cli_options

lib/relish/commands/param_methods.rb

@@ -0,0 +1,17 @@
+module Relish
+  module Command
+    module ParamMethods
+      def extract_option
+        include?(':') ? split(':')[1] : self
+      end
+
+      def without_option
+        split(':')[0]
+      end
+
+      def has_option?
+        include?(':')
+      end
+    end
+  end
+end   

spec/relish/commands/param_methods_spec.rb

@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+module Relish
+  module Command
+    describe ParamMethods do
+      let(:foo_bar) { 'foo:bar'.extend(described_class) }
+      let(:foo) { 'foo'.extend(described_class) }
+
+      describe '#extract_option' do
+        specify { foo_bar.extract_option.should eq('bar') }
+        specify { foo.extract_option.should eq('foo') }
+      end
+
+      describe '#without_option' do
+        specify { foo_bar.without_option.should eq('foo') }
+        specify { foo.without_option.should eq('foo') }
+      end
+
+      describe '#has_option?' do
+        specify { foo_bar.has_option?.should be_true }
+        specify { foo.has_option?.should be_false }
+      end
+
+    end
+  end
+end