Ruby script to convert erlang define to functions, for access from Elixir

const2fun.rb

#!/usr/bin/env ruby

# Converts all Erlang macro defines to Erlang functions.
# This is useful if you want to access those values from Elixir.
#
# If the defines are in an .hrl file, you should copy all of the 
# defines into a .erl file first and then run the script on that
# .erl file. The script will copy the .erl file to .erl.old and
# then will overwrite the existing .erl file.

require 'fileutils'
ARGV.each do |name|
  buffer = []

  FileUtils.cp(name, name + ".old")

  open(name) do |f|
    f.readlines.each do |line|
      if line =~ /-define\((.*),/
        buffer << "#{$1.downcase}() -> ?#{$1}.\n"
      else
        buffer << line
      end
    end
  end

  open(name, 'w') do |f|
    f << buffer.join
  end
end