discourse/lib/stylesheet/watcher.rb

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# frozen_string_literal: true
require "listen"
module Stylesheet
class Watcher
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 |plugin|
if plugin.path.to_s.include?(Rails.root.to_s)
@default_paths << File.dirname(plugin.path).sub(Rails.root.to_s, "").sub(%r{\A/}, "")
else
# if plugin doesnt seem to be in our app, consider it as outside of the app
# and ignore it
warn("[stylesheet watcher] Ignoring outside of rails root plugin: #{plugin.path.to_s}")
end
end
@default_paths
end
def start
Thread.new do
begin
worker_loop while true
rescue => e
STDERR.puts "CSS change notifier crashed \n#{e}"
start
end
end
listener_opts = { ignore: /xxxx/, only: /\.(css|scss)\z/ }
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listener_opts[:force_polling] = true if ENV["FORCE_POLLING"]
Thread.new do
begin
plugins_paths =
Dir
.glob("#{Rails.root}/plugins/*")
.map do |file|
if File.symlink?(file)
File.expand_path(File.readlink(file), "#{Rails.root}/plugins")
else
file
end
end
.compact
listener =
Listen.to(*@paths, listener_opts) do |modified, added, _|
paths = [modified, added].flatten
paths.compact!
paths.map! do |long|
plugin_name = nil
plugins_paths.each do |plugin_path|
if long.include?("#{plugin_path}/")
plugin_name = File.basename(plugin_path)
break
end
end
target = nil
target_match =
long.match(/admin|desktop|mobile|publish|wizard|wcag|color_definitions/)
target = target_match[0] if target_match&.length
{ basename: File.basename(long), target: target, plugin_name: plugin_name }
end
process_change(paths)
end
rescue => e
STDERR.puts "Failed to listen for CSS changes: \n#{e}"
end
listener.start
sleep
end
end
def core_assets_refresh(target)
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if target&.match(/wcag|color_definitions/)
Stylesheet::Manager.clear_color_scheme_cache!
return
end
targets = target ? [target] : %w[desktop mobile admin]
Stylesheet::Manager.clear_core_cache!(targets)
message =
targets.map! { |name| Stylesheet::Manager.new.stylesheet_data(name.to_sym) }.flatten!
MessageBus.publish "/file-change", message
end
def plugin_assets_refresh(plugin_name, target)
Stylesheet::Manager.clear_plugin_cache!(plugin_name)
targets = []
if target.present?
if DiscoursePluginRegistry.stylesheets_exists?(plugin_name, target.to_sym)
targets.push("#{plugin_name}_#{target.to_s}")
end
else
targets.push(plugin_name)
end
message =
targets.map! { |name| Stylesheet::Manager.new.stylesheet_data(name.to_sym) }.flatten!
MessageBus.publish "/file-change", message
end
def worker_loop
path = @queue.pop
@queue.pop while @queue.length > 0
if path[:plugin_name]
plugin_assets_refresh(path[:plugin_name], path[:target])
else
core_assets_refresh(path[:target])
end
end
def process_change(paths)
paths.each { |path| @queue.push path }
end
end
end