From e1a07fadd9d045114e3006e43bd36dfa1d2ada52 Mon Sep 17 00:00:00 2001
From: Dan Buch <daniel.buch@gmail.com>
Date: Sun, 2 Dec 2012 20:21:14 -0500
Subject: [PATCH] Working through an old @why post on metaprogramming

since I'd like to make the JRuby rabbitmq stuff a bit less boilerplate.
---
 why/metaid/attr_abort.rb  |  9 +++++++++
 why/metaid/happy_truck.rb |  5 +++++
 why/metaid/mail_truck.rb  | 15 +++++++++++++++
 why/metaid/metaid.rb      | 19 +++++++++++++++++++
 4 files changed, 48 insertions(+)
 create mode 100644 why/metaid/attr_abort.rb
 create mode 100644 why/metaid/happy_truck.rb
 create mode 100644 why/metaid/mail_truck.rb
 create mode 100644 why/metaid/metaid.rb

diff --git a/why/metaid/attr_abort.rb b/why/metaid/attr_abort.rb
new file mode 100644
index 0000000..f5b90d6
--- /dev/null
+++ b/why/metaid/attr_abort.rb
@@ -0,0 +1,9 @@
+class Class
+  def attr_abort(*args)
+    abort "Please no more attributes today."
+  end
+end
+
+class MyNewClass
+  attr_abort :id, :diagram, :telegram
+end
diff --git a/why/metaid/happy_truck.rb b/why/metaid/happy_truck.rb
new file mode 100644
index 0000000..a35051c
--- /dev/null
+++ b/why/metaid/happy_truck.rb
@@ -0,0 +1,5 @@
+require_relative 'mail_truck'
+
+class HappyTruck < MailTruck
+  company "Happy's -- We Bring the Mail, and That's It!"
+end
diff --git a/why/metaid/mail_truck.rb b/why/metaid/mail_truck.rb
new file mode 100644
index 0000000..283a0fd
--- /dev/null
+++ b/why/metaid/mail_truck.rb
@@ -0,0 +1,15 @@
+require_relative 'metaid'
+
+class MailTruck
+  attr_accessor :driver, :route
+
+  def initialize(driver, route)
+    @driver, @route = driver, route
+  end
+
+  def self.company(name)
+    meta_def :company do
+      name
+    end
+  end
+end
diff --git a/why/metaid/metaid.rb b/why/metaid/metaid.rb
new file mode 100644
index 0000000..c4ff082
--- /dev/null
+++ b/why/metaid/metaid.rb
@@ -0,0 +1,19 @@
+class Object
+  def metaclass
+    class << self
+      self
+    end
+  end
+
+  def meta_eval(&block)
+    metaclass.instance_eval(&block)
+  end
+
+  def meta_def(name, &block)
+    meta_eval { define_method(name, &block) }
+  end
+
+  def class_def(name, &block)
+    class_eval { define_method(name, &block) }
+  end
+end