Randomly shuffle and sample arguments

shuffle.rb

#!/usr/bin/env ruby

# Example usage in zsh:
#
# mplayer ${(f@)"$( this_script ~/Music/*.mp3 )"}

require 'slop'

opts = Slop.parse do |o|
  o.integer '-s', '--sample', 'Number of samples to take', default: 0
  o.bool '-h', '--help', 'Show this help'
end

if opts.help?
  puts opts
  exit 0
end

arr = opts.args
arr = opts[:sample] == 0 ? arr.shuffle : arr.sample(opts[:sample])

puts arr