Parameterize text

parameterize.rb

#!/usr/bin/ruby

def parameterize(string, sep = '-')
  # Turn unwanted chars into the separator
  string.gsub!(/[^a-z0-9\-_]+/i, sep)
  unless sep.nil? || sep.empty?
    re_sep = Regexp.escape(sep)
    # No more than one of the separator in a row.
    string.gsub!(/#{re_sep}{2,}/, sep)
    # Remove leading/trailing separator.
    string.gsub!(/^#{re_sep}|#{re_sep}$/i, '')
  end
  string.downcase
end

if ARGV.length < 2
  puts ""
  puts "Please specify infile and outfile"
  puts ""
  puts "eg. #{$0} infile.txt outfile.txt"
  puts ""
  exit
end

infile_path  = File.expand_path(ARGV[0])
outfile_path = File.expand_path(ARGV[1])

File.open(outfile_path, 'w') do |outfile|
  File.open(infile_path, 'r').each do |line|
    parameterized_line = parameterize(line)
    puts "#{parameterized_line}"
    outfile.puts parameterize(line)
  end
end