Simple Ruby script listening to `~/Library/Preferences` & printing the changes as UserDefaults change

plisten.rb

#!/usr/bin/env ruby

require 'diffy'    # gem install diffy
require 'listen'   # gem install listen

class String
	def colorize(color_code)
		"\e[#{color_code}m#{self}\e[0m"
	end

	def red;    colorize(31); end
	def green;  colorize(32); end
	def yellow; colorize(33); end
	def blue;   colorize(34); end
	def pink;   colorize(35); end
end

$files = { } # path => string

def plist_file_to_text path
	`plutil -p #{path}`.strip
end

def load_files
	list = `find ~/Library/Preferences -name "*.plist"`.split("\n")
	list.each{|path|
		$files[path] = plist_file_to_text path
	}
end

def cache_file path, content
	$files[path] = content
end

def process_change path

	return if path.index /(ContextStoreAgent\.plist)/

	old_content = $files[path]
	new_content = plist_file_to_text path

	cache_file path, new_content

	diff = Diffy::Diff.new old_content, new_content, :diff => '-Naur'
	diff = diff.to_s
		.split("\n")
		.filter{|line| line.start_with? /[-+]/ }
		.map{|line| line.start_with?('+') ? line.green : line.red }
		.join("\n")

	return if diff.strip.length < 2

	puts '–––––––––––––––––––––'
	puts 'Path: ' + path
	puts '–––––––––––––––––––––'

	puts diff
	puts
end

load_files

listener = Listen.to(File.expand_path('~/Library/Preferences')) do |modified, added, removed|
	modified.each{|path|
		process_change path
	}
end

listener.start
sleep