Get Chef cookbook name from cookbook directory

cookbook_name_from_directory.rb

#!/usr/bin/env ruby

#
# Syntax:
#  $ cookbook_name_from_directory.rb [DIRECTORY]
#

require 'stringio'
require 'chef/cookbook/metadata'

Dir.chdir ARGV.first unless ARGV.empty?

metadata = Chef::Cookbook::Metadata.new
if File.exist?('metadata.rb')
  metadata.from_file('metadata.rb')
elsif File.exist?('metadata.json')
  metadata.from_json(IO.read('metadata.json'))
else
  fail 'Cookbook metadata not found.'
end

puts metadata.name