require 'listen' module Stylesheet class Watcher REDIS_KEY = "dev_last_used_theme_id" def self.theme_id=(v) $redis.set(REDIS_KEY, v) end def self.theme_id ($redis.get(REDIS_KEY) || SiteSetting.default_theme_id).to_i end def self.watch(paths = nil) watcher = new(paths) watcher.start watcher end def initialize(paths) @paths = paths || Watcher.default_paths @queue = Queue.new end def self.default_paths return @default_paths if @default_paths @default_paths = ["app/assets/stylesheets"] Discourse.plugins.each do |p| @default_paths << File.dirname(p.path).sub(Rails.root.to_s, '').sub(/^\//, '') end @default_paths end def start Thread.new do begin while true worker_loop end rescue => e STDERR.puts "CSS change notifier crashed #{e}" end end root = Rails.root.to_s listener_opts = { ignore: /xxxx/ } listener_opts[:force_polling] = true if ENV['FORCE_POLLING'] @paths.each do |watch| Thread.new do begin listener = Listen.to("#{root}/#{watch}", listener_opts) do |modified, added, _| paths = [modified, added].flatten paths.compact! paths.map! { |long| long[(root.length + 1)..-1] } process_change(paths) end rescue => e STDERR.puts "Failed to listen for CSS changes at: #{watch}\n#{e}" end listener.start sleep end end end def worker_loop @queue.pop while @queue.length > 0 @queue.pop end Stylesheet::Manager.cache.clear message = ["desktop", "mobile", "admin"].map do |name| Stylesheet::Manager.stylesheet_data(name.to_sym, Stylesheet::Watcher.theme_id) end.flatten MessageBus.publish '/file-change', message end def process_change(paths) paths.each do |path| if path =~ /\.(css|scss)$/ @queue.push path end end end end end