1 files changed, 39 insertions, 0 deletions
diff --git a/forget.lisp b/forget.lisp
new file mode 100644
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--- /dev/null
+++ b/forget.lisp
@@ -0,0 +1,39 @@
+;;;; forget.lisp
+
+(in-package #:forget)
+
+(defun forget (symbol &key
+                        (function? t)
+                        (value? t)
+                        (class? t)
+                        (plist? t)
+                        (interns? t)
+                        (package? nil))
+  "Uninterns and forgets everything about a symbol"
+  (assert (symbolp symbol) (symbol) "~s is not a symbol." symbol)
+
+  (when (and function? (fboundp symbol))
+    (warn "Unbinding function ~s" symbol)
+    (fmakunbound symbol))
+
+  (when (and value? (boundp symbol))
+    (warn "Unbinding value ~s" symbol)
+    (makunbound symbol))
+
+  (when (and class? (find-class symbol nil))
+    (warn "Unbinding class ~s" symbol)
+    (setf (find-class symbol) nil))
+
+  (when (and plist? (symbol-plist symbol))
+    (warn "Dropping symbol-plist on ~s" symbol)
+    (setf (symbol-plist symbol) nil))
+
+  (when interns?
+    (warn "Uninterning ~s from ~s"
+          symbol
+          (package-name (symbol-package symbol)))
+    (unintern symbol (symbol-package symbol)))
+
+  (when (and package? (find-package symbol))
+    (warn "Deleting package ~s" (package-name (find-package symbol)))
+    (delete-package (find-package symbol))))