new_contents: #
  # Copyright (c) 2017 Shota Shimazu
  #
  # 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.
  #
  
  import Console
  import Core.io as IO
  
  import os
  
  
  def __setup_install_env():
      home = IO.homeDirectory
  
      if not os.path.exists(home):
          Console.log("Creating maple packge bin...")
          os.mkdir(home + "/.pancake_maples")
  
  def _downloader(git_url):
      Console.cmd("git clone " + git_url)
  
  def install(package):
      Console.log("Installing " + package + "...")
  
      # Prepare installing
      __setup_install_env()
  
      # Download package
      
subject: Add package manager.