Add bin and edit workflow

bin/gems/pry-0.15.2/lib/pry/commands/watch_expression/expression.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+class Pry
+  class Command
+    class WatchExpression
+      class Expression
+        attr_reader :target, :source, :value, :previous_value, :pry_instance
+
+        def initialize(pry_instance, target, source)
+          @pry_instance = pry_instance
+          @target = target
+          @source = Code.new(source).strip
+        end
+
+        def eval!
+          @previous_value = value
+          @value = Pry::ColorPrinter.pp(target_eval(target, source), ''.dup)
+        end
+
+        def to_s
+          "#{Code.new(source).highlighted.strip} => #{value}"
+        end
+
+        # Has the value of the expression changed?
+        #
+        # We use the pretty-printed string representation to detect differences
+        # as this avoids problems with dup (causes too many differences) and ==
+        # (causes too few)
+        def changed?
+          (value != previous_value)
+        end
+
+        private
+
+        def target_eval(target, source)
+          target.eval(source)
+        rescue StandardError => e
+          e
+        end
+      end
+    end
+  end
+end