Encode / Decode URL UTF-8 String

url.rb

#!/usr/bin/env ruby
# encoding: utf-8

require 'optparse'
require 'cgi'

VERSION = '0.2'

def help
  <<-MAN
usage: url [-ed] 'STR I N G'
    -e, --encode encode text, default.
    -d, --decode decode text.
    -h, --help   show this help.
  MAN
end

action = 'encode'

parser = OptionParser.new
parser.on('-e', '--encode') { action = 'encode' }
parser.on('-d', '--decode') { action = 'decode' }
parser.on_tail('-h', '--help') { puts help; exit 0 }

args = ARGV.dup
begin
  parser.parse!(args)
rescue StandardError
  puts help
  exit 1
end

str = args.join(' ').strip
res = str.dup

if action == 'encode'
  str.scan(/[^A-z\.\/\?\-:=&0-9]/).map do |char|
    res.gsub!(char, CGI.escape(char))
  end
else
  res = CGI.unescape(str)
end

unless str.empty?
  puts res
end