Useful directory wather to automatically compile or generate object files.
Install Ruby Gem
gem install directory_watcher
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Pandoc Build Daemon Script
require 'directory_watcher'
dw = DirectoryWatcher.new '.', :pre_load => true
dw.glob = '*.md'
dw.add_observer {|*args| args.each {|event| puts event}}
dw.start
gets # when the user hits "enter" the script will terminate
dw.stop