discourse/lib/stylesheet/watcher.rb

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1.5 KiB
Ruby
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require 'listen'
module Stylesheet
class Watcher
def self.watch(paths=nil)
watcher = new(paths)
watcher.start
watcher
end
def initialize(paths)
@paths = paths || ["app/assets/stylesheets", "plugins"]
@queue = Queue.new
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
@paths.each do |watch|
Thread.new do
begin
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listener = Listen.to("#{root}/#{watch}", ignore: /xxxx/) 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
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listener.start
sleep
end
end
end
def worker_loop
@queue.pop
while @queue.length > 0
@queue.pop
end
message = ["desktop", "mobile", "admin"].map do |name|
{hash: SecureRandom.hex, name: "/stylesheets/#{name}.css"}
end
Stylesheet::Manager.cache.clear
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