refactor core data types:simpliry message head, start with shape package

core/message.lisp

@@ -8,14 +8,6 @@
 
 (in-package :scopes/core/message)
 
-;;;; message-head
-
-(defclass message-head ()
-  ((domain)
-   (action)
-   (class)
-   (item)))
-
 ;;;; message
 
 (defclass message ()
@@ -24,18 +16,11 @@
    (timestamp)
    (data :accessor data :initarg :data :initform nil)))
 
-(defun create (head-vals &key data sender)
-  (let ((h (make-instance 'message-head)))
-    (dolist (sl '(domain action class item))
-      (setf (slot-value h sl) (pop head-vals)))
-    (make-instance 'message :head h :data data :sender sender)))
+(defun create (head &key data sender)
+  (make-instance 'message :head head :data data :sender sender))
 
 (defmethod print-object ((msg message) stream)
-  (with-slots (domain action class item) (head msg)
-    (format stream 
-            "<message (~a ~a ~a ~a) ~s <data ~s>>" 
-            domain action class item (sender msg) (data msg))))
+  (format stream "<message ~s ~s <data ~s>>" (head msg) (sender msg) (data msg)))
 
 (defun head-as-list (msg)
-  (with-slots (domain action class item) (head msg)
-    (list domain action class item)))
+  (head msg))

shape.lisp

@@ -0,0 +1,4 @@
+;;;; cl-scopes/shape - really abstract basic data shape definitions.
+
+(defpackage :scopes/shape
+  (:use :common-lisp))