From: Richard M. Stallman <rms@gnu.org>
Date: Mon, 2 Aug 1993 07:23:24 +0000 (+0000)
Subject: (remove-hook): Doc string added.
X-Git-Tag: emacs-19.34~11436
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=23f87cce43f42f8e623da0fe8abeabd0af76022a;p=emacs.git

(remove-hook): Doc string added.
Change a single function into a list.
---

diff --git a/lisp/emacs-lisp/lucid.el b/lisp/emacs-lisp/lucid.el
index 144aaf35b22..eaa405afd33 100644
--- a/lisp/emacs-lisp/lucid.el
+++ b/lisp/emacs-lisp/lucid.el
@@ -53,8 +53,16 @@
 	(setcdr tail new-parent))))
 
 (defun remove-hook (hook-var function)
+  "Remove a function from a hook, if it is present.
+First argument HOOK-VAR (a symbol) is the name of a hook, second
+ argument FUNCTION is the function to remove (compared with `eq')."
   (if (boundp 'hook-var)
-      (set hook-var (delq function (symbol-value hook-var)))))
+      (let ((old (symbol-value hook-var)))
+	;; If the hook value is a single function, turn it into a list.
+	(if (or (not (listp old)) (eq (car old) 'lambda))
+	    (set hook-var (list old)))
+	;; Now delete FUNCTION.
+	(set hook-var (delq function (symbol-value hook-var))))))
 
 (defun remprop (symbol prop)
   (let ((plist (symbol-plist symbol)))