lumeet

#!/usr/bin/env bin/jruby
require 'fileutils'

def replace_file(path)
  FileUtils.mv path, "#{path}.tmp"
  File.open("#{path}.tmp", 'r') do |src|
    File.open(path, 'w') do |dest|
      src.each_line do |l|
        line = yield l
        dest.print line if line