Ruby script for Louise to replace <P00000> place holder text with incrementing identifier eg. <P00001>

identifer.rb

#!/usr/bin/env ruby
class Identify
  
  def insertIdentifiers (fileName)
 
    out_filename = fileName.gsub(".rtf", "-transformed.rtf")
    puts out_filename
    out_file = File.new(out_filename, "w")

    count = 0
    replace_proc = proc do
      count += 1
      '<P' + count.to_s.rjust(5, '0') + '>'
    end

    File.open(fileName).each { |line|
      out_file.puts line.gsub(/<P00000>/, &replace_proc)
    }
 
  end
   
end

if __FILE__ == $0

  if ARGV.length == 0
      abort "\nError: Louise, an input file name is required. Aborting...\n\n"
  elsif ARGV.length > 2
      abort "\nError: The program takes one arguments maximum. Aborting...\n\n"
  end

  proc = Identify.new
  proc.insertIdentifiers(ARGV[0])
end