bash_friendly_password.rb

#! /usr/bin/env ruby

# USAGE:
# sudo port install pwgen
# bundle exec ruby script/dev/bash_friendly_password.rb nil 49

def bash_friendly_password(password=nil, length=128)
  password ||= `pwgen -syv #{length} 1`
  password.size.times do |i|
    password = password.
    gsub(/\$/, Random.rand(1..9).to_s).
    gsub(/\\/, Random.rand(1..9).to_s).
    gsub(/\(/, Random.rand(1..9).to_s).
    gsub(/\)/, Random.rand(1..9).to_s).
    gsub(/\"/, Random.rand(1..9).to_s).
    gsub(/\'/, Random.rand(1..9).to_s).
    gsub(/\|/, Random.rand(1..9).to_s).
    gsub(/\;/, Random.rand(1..9).to_s).
    gsub(/\!/, Random.rand(1..9).to_s).
    gsub(/\`/, Random.rand(1..9).to_s).
    gsub(/\&/, Random.rand(1..9).to_s).
    gsub(/\</, Random.rand(1..9).to_s).
    gsub(/\>/, Random.rand(1..9).to_s).
    gsub(/\s/, Random.rand(1..9).to_s)
  end
  password
end

def test_bash_friendly_password
  password = "$ ` \\ !! \" ' | ; ` () & <> \n"
  npwd = bash_friendly_password(password, 28)
  npwd.size == password.size && (password.split & npwd.split).empty? && npwd.match(/\s/).nil?
end

if test_bash_friendly_password
  puts bash_friendly_password(ARGV[0] != 'nil' ? ARGV[0] : nil, ARGV[1] ? ARGV[1].to_i : nil)
  exit 0
else
  puts 'fix the test!'
  exit 1
end