cache.rb~ in attractor-2.3.0

- old
+ new
@@ -1,66 +1,133 @@
\ No newline at end of file
+# frozen_string_literal: true
+
+require "fileutils"
+require "psych"
+
+module Attractor
+  class Cache
+    class << self
+      def read(file_path:)
+        adapter.read(file_path: file_path)
+      end
+
+      def write(file_path:, value:)
+        adapter.write(file_path: file_path, value: value)
+      end
+
+      private
+
+      def adapter
+        @@adapter ||= CacheAdapter::JSON.instance
+      end
+    end
+  end
+
+  module CacheAdapter
+    class Base
+      include Singleton
+    end
+
+    class JSON < Base
+      def initialize
+        super
+
+        @data_directory = "tmp"
+        FileUtils.mkdir_p @data_directory
+        FileUtils.touch filename
+
+        begin
+          @store = ::JSON.parse(File.read(filename))
+        rescue ::JSON::ParserError
+          @store = {}
+        end
+      end
+
+      def read(file_path:)
+        value_hash = @store[file_path]
+
+        Value.new(**value_hash.values.first.transform_keys(&:to_sym)) unless value_hash.nil?
+      rescue ArgumentError => e
+        puts "Couldn't rehydrate value from cache: #{e.message}"
+        nil
+      end
+
+      def write(file_path:, value:)
+        mappings = {x: :churn, y: :complexity}
+
+        transformed_value = value.to_h.transform_keys { |k| mappings[k] || k }
+        @store[file_path] = {value.current_commit => transformed_value}
+        File.write(filename, ::JSON.dump(@store))
+      end
+
+      def filename
+        "#{@data_directory}/attractor-cache.json"
+      end
+    end
+  end
+end