Hash all files in directory

hashifier.rb

require 'pathname'
require 'digest'

Pathname.new(Dir.pwd).children.select(&:file?).each do |file|
  next if file.basename.to_s.start_with?('hashed_') || file.extname == '.rb'
  file_md5 = Digest::MD5.file(file).hexdigest
  old_name = file.basename
  new_name = "hashed_#{file_md5}_#{old_name}"
  puts "#{old_name} -> #{new_name}"
  File.rename old_name, new_name
end