mv folders to have underscore prefix

underscored.rb

#!/usr/bin/env ruby
#
# mv folders to have underscore prefix
#
# Author::    Soon Van - randomecho.com
# Copyright:: Copyright 2016 Soon Van
# License::   http://opensource.org/licenses/BSD-3-Clause

require 'FileUtils'

@total_count = 0

def underscored(path_to)
  Dir.foreach(path_to) do |dir|
    full_path = path_to + dir
    new_path = path_to + '__' + dir

    if dir[0,1] != '.' && File.directory?(full_path)
        FileUtils.mv(full_path, new_path)
        puts "mv #{full_path} -> #{new_path}"
        @total_count += 1
    end
  end
end

#Gem.win_platform? ? (system "cls") : (system "clear")
if ARGV[0].nil?
  puts "! No folder specified."
  puts "Use the following format: \n\n"
  puts "$ #{File.basename(__FILE__)} /path/to"
  exit
else
  underscored(ARGV[0])

  if @total_count > 0
    puts "Total moved: #{@total_count}"
  end
end