discourse/lib/stylesheet/watcher.rb

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require 'listen'
module Stylesheet
class Watcher
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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
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listener_opts = { ignore: /xxxx/ }
listener_opts[:force_polling] = true if ENV['FORCE_POLLING']
@paths.each do |watch|
Thread.new do
begin
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listener = Listen.to("#{root}/#{watch}", listener_opts) do |modified, added, _|
paths = [modified, added].flatten
paths.compact!
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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
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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|
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{ target: name, new_href: Stylesheet::Manager.stylesheet_href(name.to_sym) , theme_key: SiteSetting.default_theme_key }
end
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