lib/lono/core.rb in lono-4.1.0 vs lib/lono/core.rb in lono-4.2.0

@@ -1,27 +1,45 @@
 require 'pathname'
 
 module Lono
   module Core
+    extend Memoist
     autoload :Config, 'lono/core/config'
 
-    @@config = nil
     def config
-      @@config ||= Config.new
+      Config.new
     end
+    memoize :config
 
     def root
       path = ENV['LONO_ROOT'] || '.'
       Pathname.new(path)
     end
+    memoize :root
 
-    @@env = nil
     def env
-      return @@env if @@env
       ufo_env = env_from_profile(ENV['AWS_PROFILE']) || 'development'
       ufo_env = ENV['LONO_ENV'] if ENV['LONO_ENV'] # highest precedence
-      @@env = ufo_env
+      ufo_env
     end
+    memoize :env
+
+    # Precedence (highest to lowest)
+    #   1. LONO_SUFFIX
+    #   2. .current/lono
+    #   3. config/settings.yml
+    def suffix
+      suffix = ENV['LONO_SUFFIX'] # highest precedence
+      suffix ||= Cfn::Current.suffix
+      unless suffix
+        settings = Setting.new.data
+        suffix ||= settings["stack_name_suffix"] # lowest precedence
+      end
+
+      return if suffix&.empty?
+      suffix
+    end
+    memoize :suffix
 
     private
     # Do not use the Setting class to load the profile because it can cause an
     # infinite loop then if we decide to use Lono.env from within settings class.
     def env_from_profile(aws_profile)