Start implmenting a `heroku sauce:configure` command

Aruba is nifty

features/cli/configure.feature

@@ -0,0 +1,50 @@
+Feature: Configure the Sauce credentials
+  In order to get started quickly with the Sauce Heroku CLI
+  As a heroku user
+  I should be able to configure my Sauce credentials through the CLI plugin
+
+
+  Scenario: Display configure help
+    When I run `heroku sauce:configure -h`
+    Then the output should contain:
+      """
+      Usage: heroku sauce:configure
+
+       Configure the Sauce CLI plugin with your username and API key
+
+       This command can be used interactively, or all the arguments can be passed on the command line.
+
+       Interactively: `heroku sauce:configure`
+
+       CLI options:
+
+       -u, --user USERNAME  # Your Sauce Labs username
+       -k, --apikey APIKEY  # Your Sauce Labs API key
+      """
+
+    Scenario: Interactive configuration
+      When I run `heroku sauce:configure` interactively
+      And I type "cucumber"
+      And I type "cucumberapikey"
+      Then the output should contain:
+        """
+        Sauce CLI plugin configured with:
+
+        Username: cucumber
+        API key : cucumberapikey
+
+        If you would like to change this later, update "ondemand.yml" in your current directory
+        """
+        And a file named "ondemand.yml" should exist
+
+
+    @wip
+    Scenario: Interactive configuration without valueis
+      When I run `heroku sauce:configure` interactively
+      And I type ""
+      And I type ""
+      Then the output should contain:
+        """
+        Whoops! I think you forgot to give me a valid username and API key
+        """
+

lib/sauce/heroku/cli.rb

@@ -11,6 +11,48 @@ module Heroku
       def help
         display 'Sauce for Heroku Help'
       end
+
+      # sauce:configure
+      #
+      # Configure the Sauce CLI plugin with your username and API key
+      #
+      # This command can be used interactively, or all the arguments can be passed on the command line.
+      #
+      # Interactively: `heroku sauce:configure`
+      #
+      # CLI options:
+      #
+      # -u, --user USERNAME  # Your Sauce Labs username
+      # -k, --apikey APIKEY  # Your Sauce Labs API key
+      def configure
+        username = options[:user]
+        apikey = options[:apikey]
+
+        if username.nil? && apikey.nil?
+          # Let's go interactive!
+          display "Sauce username: ", false
+          username = ask
+          display "Sauce API key: ", false
+          apikey = ask
+          display ''
+        end
+
+        display 'Sauce CLI plugin configured with:'
+        display ''
+        display "Username: #{username}"
+        display "API key : #{apikey}"
+        display ''
+        display 'If you would like to change this later, update "ondemand.yml" in your current directory'
+
+
+        File.open('ondemand.yml', 'w+') do |f|
+          f.write("""
+---
+username: #{username}
+access_key: #{apikey}
+""")
+        end
+      end
     end
   end
 end