ramhoj · July 6, 2020 10:48 · Jul 6, 2020
diff --git a/README.md b/README.md
@@ -0,0 +1,2 @@
+Shortcut to prepend module that checks an argument and only calls original implementation if argument evals to false.
+Other versions could instead execute super(*args) and do different things depending on the result.
diff --git a/my_class.rb b/my_class.rb
@@ -0,0 +1,21 @@
+class MyClass
+  extend Prependable
+
+  define_prepend :dry, guard: -> { dry_run? }, body: ->(name) { puts "#{name} was called." }
+
+  dry def delete
+    MyFileUtil.copy_to_trash
+    MyFileUtil.delete_all
+  end
+
+  dry def move
+    MyFileUtil.copy_to_loclation
+    MyFileUtil.delete_all
+  end
+
+  private
+
+  def dry_run?
+    ENV["dry"]
+  end
+end
diff --git a/prependable.rb b/prependable.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Prependable
+  def define_prepend(prepend_name, guard:, body:)
+    define_singleton_method(prepend_name) do |name|
+      mod = Module.new do
+        define_method(name) do |*args|
+          if instance_exec(&guard)
+            instance_exec(name, &body)
+          else
+            super(*args)
+          end
+        end
+      end
+
+      prepend mod
+      name
+    end
+  end
+end
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Shortcut to prepend module that checks an argument and only calls original implementation if argument evals to false.
		Other versions could instead execute super(*args) and do different things depending on the result.
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