refactor on_changes

app/controllers/scores_controller.rb

@@ -7,10 +7,9 @@ class ScoresController < ApplicationController
   # GET /scores
   def index
     @pagy, @scores = pagy(Score.all)
-    # logger.info("#{HotConstants.boolean}")
-    logger.info('start', dimensions: AnsiDimensions.start)
-    logger.info('end', dimensions: AnsiDimensions.end)
-    logger.info('around', dimensions: AnsiDimensions.around)
+    # logger.info('start', dimensions: AnsiDimensions.start)
+    # logger.info('end', dimensions: AnsiDimensions.end)
+    # logger.info('around', dimensions: AnsiDimensions.around)
   end
 
   # GET /scores/1

config/initializers/hot_constants.rb → config/initializers/hot_changes.rb

@@ -2,6 +2,5 @@ return unless defined?(Rails::Server)
 
 require Rails.root.join('lib', 'hot_constants', 'hot_constants')
 
-HotConstants.initialize
 HotConstants.on_change(:log_active_record) { |bool| ActiveRecord::Base.logger.level = bool ? :debug : :fatal }
 HotConstants.on_change(:log_action_view) { |bool| ActionView::Base.logger.level = bool ? :debug : :fatal }

config/initializers/rails_live_reload.rb

@@ -5,6 +5,7 @@ if defined?(RailsLiveReload) && Rails.env.development?
     # HOT Constants
     config.watch(%r{/\.env$}, reload: :always)
     config.watch(%r{/\.env\.sample$})
+    config.watch(%r{/config/initializers/hot_changes.rb$})
 
     # USEFUL for tailwind changes!!!!
     config.watch %r{app/assets/builds/tailwind.css}, reload: :always

lib/hot_constants/hot_constants.rb

@@ -15,24 +15,28 @@ module HotConstants
         singleton_class.define_method(dkey) { method.call(key, value) }
         LOGGER.info("create method <#{dkey}> performing <#{method.name}> with default value <#{value}> ")
       end
-      reload!
     end
 
     def reload!
       HOTENV.replace Dotenv.parse # TODO: detect true changes before processing block below (or yield)
       LISTENERS.each_pair do |key, block|
-        old_value = nil # TODO: remember last previous value
-        new_value = method(key).call
-        block.call(new_value, old_value)
+        perform_change(key, block)
       end
     end
 
     def on_change(key, &block)
       LISTENERS[key.downcase.to_sym] = block
+      perform_change(key, block)
     end
 
     private
 
+    def perform_change(key, block)
+      old_value = nil # TODO: remember last previous value
+      new_value = method(key).call
+      block.call(new_value, old_value)
+    end
+
     def load_boolean(key, default) = HOTENV.fetch(key, default).to_s.downcase == 'true'
     def load_integer(key, default) = HOTENV.fetch(key, default).to_i
     def load_string(key, default) = HOTENV.fetch(key, default)
@@ -45,4 +49,7 @@ module HotConstants
       end
     end
   end
+
+  # initialize on first require
+  initialize
 end

lib/monkey_patches/rails_live_reload/watcher.rb

@@ -1,6 +1,7 @@
 module RailsLiveReload
   ENV_FILE = Rails.root.join('.env').to_s
   ENV_SAMPLE_FILE = Rails.root.join('.env.sample').to_s
+  INITIALIZER = Rails.root.join('config/initializers/hot_changes.rb').to_s
   CHECKSUMS = {}
 
   # MonkeyPath Watcher
@@ -14,20 +15,19 @@ module RailsLiveReload
     private
 
     def before_reload(files)
-      if files.include?(ENV_SAMPLE_FILE)
-        current_checksum = files[ENV_SAMPLE_FILE]
-        if current_checksum != CHECKSUMS[ENV_SAMPLE_FILE]
-          HotConstants.initialize
-          CHECKSUMS[ENV_SAMPLE_FILE] = current_checksum
-        end
-      end
-      return unless files.include?(ENV_FILE)
+      perform_when_change(files, ENV_SAMPLE_FILE) { HotConstants.initialize }
+      perform_when_change(files, ENV_FILE) { HotConstants.reload! }
+      perform_when_change(files, INITIALIZER) { load Rails.root.join('config', 'initializers', 'hot_changes.rb') }
+    end
+
+    def perform_when_change(files, key, &)
+      return unless files.include?(key)
 
-      current_checksum = files[ENV_FILE]
-      return unless current_checksum != CHECKSUMS[ENV_FILE]
+      current_checksum = files[key]
+      return unless current_checksum != CHECKSUMS[key]
 
-      HotConstants.reload!
-      CHECKSUMS[ENV_FILE] = current_checksum
+      yield
+      CHECKSUMS[key] = current_checksum
     end
   end
 end