Watch a directory recursively, recompiling .tex files on changes

recompile.rb

require 'rb-inotify'

notifier = INotify::Notifier.new

notifier.watch('.', :modify, :recursive) do |event|
  if event.name.end_with? ".tex"
    puts "#{`date`.chomp}: Modified #{event.name}; recompiling..."
    `pdflatex -interaction batchmode -output-directory #{File.dirname(event.absolute_name)} #{event.absolute_name} > /dev/null 2>&1`
  end
end

notifier.run

Turns out that rb-inotify has a :recursive option.