cgiacomi/r2do

#
#  Copyright 2012 Christian Giacomi http://www.christiangiacomi.com
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#

module R2do
  module Commands
    class HelpCommand < Command

      def initialize(cmd_list)
        super('h', 'help', 'Shows the help for a given command')

        @cmd_list = cmd_list
      end

      # Initializes the applications and resets the datafile
      #
      # @param [Array] args the arguments passed to the app by the user
      # @return [void]
      def execute(args)
        argument = args[1]

        cmd = @cmd_list.find { |c| c.short == argument or c.extended == argument }
        if cmd.nil?
          raise InvalidCommandError, "Invalid command. See 'r2do -h'"
        end

        UI.status(cmd.help())
      end


    end

  end

end