Added ConfigFile for persistent hash storage

lib/cyberarm_engine.rb

@@ -4,6 +4,7 @@ rescue LoadError => e
   pp e
   require "gosu"
 end
+require "json"
 
 require_relative "cyberarm_engine/version"
 
@@ -24,6 +25,7 @@ require_relative "cyberarm_engine/animator"
 
 require_relative "cyberarm_engine/text"
 require_relative "cyberarm_engine/timer"
+require_relative "cyberarm_engine/config_file"
 
 require_relative "cyberarm_engine/ui/dsl"
 

lib/cyberarm_engine/config_file.rb

@@ -0,0 +1,46 @@
+module CyberarmEngine
+  class ConfigFile
+    def initialize(file:)
+      @file = file
+
+      if File.exist?(@file)
+        deserialize
+      else
+        @data = {}
+      end
+    end
+
+    def []= *keys, value
+      last_key = keys.last
+
+      if keys.size == 1
+        hash = @data
+      else
+        keys.pop
+        hash = @data[keys.shift] ||= {}
+
+        keys.each do |key|
+          hash[key] ||= {}
+        end
+      end
+
+      hash[last_key] = value
+    end
+
+    def get(*keys)
+      @data.dig(*keys)
+    end
+
+    def serialize
+      JSON.dump(@data)
+    end
+
+    def deserialize
+      @data = JSON.parse(File.read(@file), symbolize_names: true)
+    end
+
+    def save!
+      File.open(@file, "w") { |f| f.write(serialize) }
+    end
+  end
+end