Move the template initialization to the Guard module and add specs.

lib/guard.rb

@@ -18,6 +18,28 @@ module Guard
   class << self
     attr_accessor :options, :interactor, :listener
 
+    # Creates the initial Guardfile template or add a Guard implementation
+    # Guardfile template to an existing Guardfile.
+    #
+    # @see Guard::Guard.init
+    #
+    # @param [String] guard_name the name of the Guard to initialize
+    #
+    def initialize_template(guard_name = nil)
+      if guard_name
+        guard_class = ::Guard.get_guard_class(guard_name)
+        guard_class.init(guard_name)
+      else
+        if !File.exist?('Guardfile')
+          ::Guard::UI.info "Writing new Guardfile to #{ Dir.pwd }/Guardfile"
+          FileUtils.cp(File.expand_path('../templates/Guardfile', __FILE__), 'Guardfile')
+        else
+          ::Guard::UI.error "Guardfile already exists at #{ Dir.pwd }/Guardfile"
+          exit 1
+        end
+      end
+    end
+
     # Initialize the Guard singleton.
     #
     # @option options [Boolean] clear if auto clear the UI should be done

lib/guard/cli.rb

@@ -3,8 +3,9 @@ require 'guard/version'
 
 module Guard
 
-  # Guard command line interface managed by [Thor](https://github.com/wycats/thor).
+  # Facade for the Guard command line interface managed by [Thor](https://github.com/wycats/thor).
   # This is the main interface to Guard that is called by the Guard binary `bin/guard`.
+  # Do not put any logic in here, create a class and delegate instead.
   #
   class CLI < Thor
 
@@ -66,6 +67,8 @@ module Guard
     # List the Guards that are available for use in your system and marks
     # those that are currently used in your `Guardfile`.
     #
+    # @see Guard::DslDescriber.list
+    #
     def list
       Guard::DslDescriber.list(options)
     end
@@ -86,21 +89,12 @@ module Guard
     # Appends the Guard template to the `Guardfile`, or creates an initial
     # `Guardfile` when no Guard name is passed.
     #
+    # @see Guard.initialize_template
+    #
     # @param [String] guard_name the name of the Guard to initialize
     #
     def init(guard_name = nil)
-      if !File.exist?('Guardfile')
-        puts "Writing new Guardfile to #{Dir.pwd}/Guardfile"
-        FileUtils.cp(File.expand_path('../templates/Guardfile', __FILE__), 'Guardfile')
-      elsif guard_name.nil?
-        Guard::UI.error "Guardfile already exists at #{ Dir.pwd }/Guardfile"
-        exit 1
-      end
-
-      if guard_name
-        guard_class = ::Guard.get_guard_class(guard_name)
-        guard_class.init(guard_name)
-      end
+      Guard.initialize_template(guard_name)
     end
 
     desc 'show', 'Show all defined Guards and their options'
@@ -109,6 +103,8 @@ module Guard
     # Shows all Guards and their options that are defined in
     # the `Guardfile`.
     #
+    # @see Guard::DslDescriber.show
+    #
     def show
       Guard::DslDescriber.show(options)
     end

spec/guard_spec.rb

@@ -3,6 +3,45 @@ require 'guard/guard'
 
 describe Guard do
 
+  describe ".initialize_template" do
+    context "with a Guard name" do
+      it "initializes a the Guard" do
+        class Guard::TestGuard < Guard::Guard
+        end
+        Guard::TestGuard.should_receive(:init)
+        Guard.initialize_template('test-guard')
+      end
+    end
+
+    context "without a Guard name" do
+      context "with an existing Guardfile" do
+        before do
+          File.stub(:exist?).and_return true
+          Dir.stub(:pwd).and_return "/home/user"
+        end
+
+        it "shows an error" do
+          Guard.should_receive(:exit).with 1
+          ::Guard::UI.should_receive(:error).with("Guardfile already exists at /home/user/Guardfile")
+          Guard.initialize_template()
+        end
+      end
+
+      context "without an existing Guardfile" do
+        before do
+          File.stub(:exist?).and_return false
+          Dir.stub(:pwd).and_return "/home/user"
+        end
+
+        it "copies the Guardfile template" do
+          ::Guard::UI.should_receive(:info).with("Writing new Guardfile to /home/user/Guardfile")
+          FileUtils.should_receive(:cp).with(an_instance_of(String), 'Guardfile')
+          Guard.initialize_template()
+        end
+      end
+    end
+  end
+
   describe ".setup" do
     subject { ::Guard.setup }