Ruby文字列のUnicodeエスケープシーケンスをデコードする

decode_unicode.rb

# 
# https://techracho.bpsinc.jp/baba/2013_05_31/8837
# 
dir = '~/Downloads/Dev/JSON/'

dir = File.expand_path(dir)

def decode(file)
  puts file

  result = ""
  File.open(file) do |f|
    result = f.read
  end

  result = result.gsub(/\\u([\da-fA-F]{4})/) { [$1].pack('H*').unpack('n*').pack('U*') }
  puts result
  File.open(file, 'w') do |f|
    f.write result
  end
end


# file = 'xxx.json'
# path = File.join(dir, file)
# decode(path)

Dir.glob("#{dir}/*") do |file|
  decode file
end