module Rails::Generators::AppName

def app_const
  @app_const ||= "#{app_const_base}::Application"
end

def app_const_base
  @app_const_base ||= app_name.gsub(/\W/, "_").squeeze("_").camelize
end

def app_name
  @app_name ||= original_app_name.parameterize(preserve_case: true).underscore
end

def original_app_name
  @original_app_name ||= (options[:name] || File.basename(destination_root))
end

def valid_const?
  if /^\d/.match?(app_const)
    raise Error, "Invalid application name #{original_app_name}. Please give a name which does not start with numbers."
  elsif RESERVED_NAMES.include?(original_app_name)
    raise Error, "Invalid application name #{original_app_name}. Please give a " \
                 "name which does not match one of the reserved rails " \
                 "words: #{RESERVED_NAMES.join(", ")}"
  elsif Object.const_defined?(app_const_base)
    raise Error, "Invalid application name #{original_app_name}, constant #{app_const_base} is already in use. Please choose another application name."
  end
end