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(add-hook): Doc fix.

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This commit is contained in:
Richard M. Stallman 1994-09-20 00:59:24 +00:00
parent e08455275a
commit 2a598462ec
1 changed files with 9 additions and 1 deletions
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10
lisp/subr.el
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@ -551,7 +551,15 @@ FUNCTION is added at the end.
HOOK should be a symbol, and FUNCTION may be any valid function. If
HOOK is void, it is first set to nil. If HOOK's value is a single
function, it is changed to a list of functions."
function, it is changed to a list of functions.
Note: if you make a hook variable buffer-local, copy its value before
you use `add-hook' to add to it. For example,
(make-local-variable 'foo-hook)
(if (boundp 'foo-hook)
(setq foo-hook (copy-sequence foo-hook)))
(add-hook 'foo-hook 'my-foo-function)"
(or (boundp hook) (set hook nil))
;; If the hook value is a single function, turn it into a list.
(let ((old (symbol-value hook)))