hot_constants reads .env.sample

.env.sample

@@ -11,8 +11,10 @@
 #--------------
 STIMULUS_DEBUG=false
 LOG_ACTIVE_RECORD=false
-LOG_ACTION_VIEW=false
+LOG_ACTION_VIEW=true
 
-INTEGER=1
-STRING=""
-BOOLEAN=true
+# INTEGER=2
+# STRING=
+# BOOLEAN=true
+
+# IDEA: optional nil ends with '?''

app/controllers/scores_controller.rb

@@ -7,6 +7,7 @@ class ScoresController < ApplicationController
   # GET /scores
   def index
     @pagy, @scores = pagy(Score.all)
+    # logger.info("#{HotConstants.boolean}")
   end
 
   # GET /scores/1

config/environments/development.rb

@@ -77,11 +77,6 @@ Rails.application.configure do # rubocop:disable Metrics/BlockLength
   routes.default_url_options[:port] = ARGV[1] # ie: Procfile.dev --port PORT
   routes.default_url_options[:host] = '127.0.0.1'
 
-  config.after_initialize do
-    require Rails.root.join('lib', 'hot_constants', 'hot_constants')
-    HotConstants.reload!
-  end
-
   require Rails.root.join('lib', 'formatters', 'ansi_formatter')
   formatter = AnsiFormatter.new
   config.semantic_logger.add_appender(io: $stdout,

config/initializers/hot_constants.rb

@@ -0,0 +1,8 @@
+return unless defined?(Rails::Server)
+
+require Rails.root.join('lib', 'hot_constants', 'hot_constants')
+
+HotConstants.initialize
+
+logger.info('hot constants initialized!')
+# TODO: provide kind of a callback method which provides new value of hot constant change

config/initializers/rails_live_reload.rb

@@ -3,7 +3,8 @@
 if defined?(RailsLiveReload) && Rails.env.development?
   RailsLiveReload.configure do |config|
     # HOT Constants
-    config.watch(%r{/\.env}, reload: :always)
+    config.watch(%r{/\.env$}, reload: :always)
+    config.watch(%r{/\.env\.sample$})
 
     # USEFUL for tailwind changes!!!!
     config.watch %r{app/assets/builds/tailwind.css}, reload: :always

lib/hot_constants/hot_constants.rb

@@ -7,25 +7,40 @@ module HotConstants
 
   class << self
     def initialize
-      LOGGER.info('initializing')
+      env_sample = Dotenv.parse('.env.sample')
+      env_sample.each do |key, value|
+        dkey = key.downcase
+        method = method_from_value(value)
+        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 stimulus_debug = load_boolean('STIMULUS_DEBUG', false)
-    def log_active_record = load_boolean('LOG_ACTIVE_RECORD', true)
-    def log_action_view = load_boolean('LOG_ACTION_VIEW', true)
 
     def reload!
-      HOTENV.replace Dotenv.parse
-      # LOGGER.warn 'reloaded!'
+      HOTENV.replace Dotenv.parse # detect true changes before processing block below (or yield)
 
-      ActiveRecord::Base.logger.level = log_active_record ? :debug : :fatal
-      ActionView::Base.logger.level = log_action_view ? :debug : :fatal
+      # TODO: replace with yield, thus externaliz process_block on behalf of HotEnv#initialize
+      process_block
     end
 
     private
 
     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)
+
+    def method_from_value(value)
+      case value.downcase
+      when /^(true|false)$/ then method(:load_boolean)
+      when /^\d+$/ then method(:load_integer)
+      else method(:load_string)
+      end
     end
 
-  reload!
+    def process_block
+      ActiveRecord::Base.logger.level = log_active_record ? :debug : :fatal
+      ActionView::Base.logger.level = log_action_view ? :debug : :fatal
+    end
+  end
 end

lib/monkey_patches/rails_live_reload/watcher.rb

@@ -1,4 +1,8 @@
 module RailsLiveReload
+  ENV_FILE = Rails.root.join('.env').to_s
+  ENV_SAMPLE_FILE = Rails.root.join('.env.sample').to_s
+  CHECKSUMS = {}
+
   # MonkeyPath Watcher
   class Watcher
     def reload_all
@@ -9,10 +13,21 @@ module RailsLiveReload
 
     private
 
-    ENV_FILE = Rails.root.join('.env').to_s
-
     def before_reload(files)
-      HotConstants.reload! if files.find { |change| change[0] == ENV_FILE }
+      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)
+
+      current_checksum = files[ENV_FILE]
+      return unless current_checksum != CHECKSUMS[ENV_FILE]
+
+      HotConstants.reload!
+      CHECKSUMS[ENV_FILE] = current_checksum
     end
   end
 end