Contents

#!/usr/bin/env ruby

# == Synopsis 
#   This is a simple shift (Caesar) cipher for Ruby
#
# == Examples
#   Encode text 
#     shift_cipher -o 4 "hello world"  =>  "khoor zruog"
#   Decode text
#     shift_cipher -o 4 -d "khoor zruog"  =>  "hello world"
#
#   Other examples:
#     We can set the starting letter of the shifted alphabet rather than the offset. The following is 
#     equivalent to shift_cipher -o 3 "hello world"
#       shift_cipher -s "c" "hello world"  =>  "jgnnq yqtnf"
#
# == Usage 
#   shift_cipher [options] text
#
#   For help use: shift_cipher -h
#
# == Options
#   -h, --help                Displays help message
#   -o, --offset OFFSET       Sets the alphabet offset
#   -s, --start START         Sets the starting letter of the shifted alphabet
#   -d, --decrypt             Decrypts the given message    Decrypt
#
# == Author
#   elsapet
#
# == Copyright
#   Copyright (c) 2015 elsapet
#   Licensed under the MIT License: http://www.opensource.org/licenses/mit-license.php


require 'shift_cipher'
require 'optparse'

options = {}

OptionParser.new do |opts|
  opts.on("-o [OFFSET]", "--offset [OFFSET]", "-s [OFFSET]", "--start [OFFSET]") do |o|
    options[:offset] = o
  end
  opts.on("-d", "--decrypt", "Decrypt") do
    options[:decrypt] = true
  end
end.parse!

cipher = options[:offset] ? ShiftCipher::Caesar.new(options[:offset]) : ShiftCipher::Caesar.new

if options[:decrypt]
  p cipher.decrypt(ARGV.last)
else
  p cipher.encrypt(ARGV.last)
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
shift_cipher-1.1.0	bin/shift_cipher
shift_cipher-1.0.0	bin/shift_cipher