module Config

def default_paths
  paths = {}
  # configuration files to look for
  EXTENSIONS.each do |ext|
    paths[ext] = [] unless paths[ext]
    ###############################
    # system level configuration
    ###############################
    paths[ext] << File.join(%(/etc), %(pangea), %(pangea.#{ext}))
    paths[ext].concat(
      Dir.glob(
        File.join(%(/etc/), %(pangea), %(conf.d), %(*.#{ext}))
      )
    )
    # end system level configuration
    ###############################
    # home configuration
    ###############################
    paths[ext] << File.join(xdg_config_home, %(pangea), %(pangea.#{ext}))
    paths[ext].concat(
      Dir.glob(
        File.join(xdg_config_home, %(pangea), %(conf.d), %(*.#{ext}))
      )
    )
    # end home configuration
    ###############################
    # local configuration
    ###############################
    paths[ext] << %(pangea.#{ext})
    paths[ext] << Dir.glob(
      File.join(
        %(pangea),
        %(conf.d),
        %(*.#{ext})
      )
    )
    # end local configuration
  end
  # only return existing files
  res = []
  EXTENSIONS.each do |ext|
    files = paths[ext]
    files.each do |file|
      res << file if File.exist?(file.to_s)
    end
  end
  res
end