Allow Pry::Method::Patcher to work without _pry_

lib/pry/commands/edit.rb

@@ -83,7 +83,7 @@ class Pry
         ExceptionPatcher.new(_pry_, state, file_and_line_for_current_exception).perform_patch
       else
         if code_object.is_a?(Pry::Method)
-          Method::Patcher.new(_pry_, code_object).perform_patch
+          Method::Patcher.new(code_object).perform_patch
         else
           raise NotImplementedError, "Cannot yet patch #{code_object} objects!"
         end

lib/pry/method.rb

@@ -266,7 +266,7 @@ class Pry
                   when :c
                     c_source
                   when :ruby
-                    ruby_source
+                    Patcher.new(self).cached_source || ruby_source
                   end
     end
 

lib/pry/method/patcher.rb

@@ -1,31 +1,45 @@
 class Pry
   class Method
     class Patcher
-      attr_accessor :_pry_
       attr_accessor :code_object
 
-      def initialize(_pry_, code_object)
-        @_pry_ = _pry_
+      @@source_cache = {}
+
+      def initialize(code_object)
         @code_object = code_object
       end
 
+      def cached_source
+        @@source_cache[code_object.source_file]
+      end
+
       # perform the patch
       def perform_patch
+        source = patched_code
         if code_object.alias?
           with_method_transaction do
-            _pry_.evaluate_ruby patched_code
+            cached_eval source
           end
         else
-          _pry_.evaluate_ruby patched_code
+          cached_eval source
         end
       end
 
       private
 
+      def cached_eval(source)
+        @@source_cache[cache_key] = source
+        TOPLEVEL_BINDING.eval source, cache_key
+      end
+
       def patched_code
         @patched_code ||= wrap(Pry::Editor.edit_tempfile_with_content(code_object.source.lines.to_a))
       end
 
+      def cache_key
+        "pry!#{code_object.owner.object_id}!#{code_object.name}"
+      end
+
       # Run some code ensuring that at the end target#meth_name will not have changed.
       #
       # When we're redefining aliased methods we will overwrite the method at the