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;;; parenface.el --- Provide a face for parens in lisp modes.
;; By Dave Pearson <davep@davep.org>
;; $Revision: 1.1 $
;; Add a paren-face to emacs and add support for it to the various lisp modes.
;;
;; Based on some code that Boris Schaefer <boris@uncommon-sense.net> posted
;; to comp.lang.scheme in message <87hf8g9nw5.fsf@qiwi.uncommon-sense.net>.
(defvar paren-face 'paren-face)
(defface paren-face
'((((class color))
(:foreground "DimGray")))
"Face for displaying a paren."
:group 'faces)
(defmacro paren-face-add-support (keywords)
"Generate a lambda expression for use in a hook."
`(lambda ()
(let* ((regexp "(\\|)")
(match (assoc regexp ,keywords)))
(unless (eq (cdr match) paren-face)
(setq ,keywords (append (list (cons regexp paren-face)) ,keywords))))))
;; Keep the compiler quiet.
(eval-when-compile
(defvar scheme-font-lock-keywords-2 nil)
(defvar lisp-font-lock-keywords-2 nil))
(add-hook 'scheme-mode-hook (paren-face-add-support scheme-font-lock-keywords-2))
(add-hook 'lisp-mode-hook (paren-face-add-support lisp-font-lock-keywords-2))
(add-hook 'emacs-lisp-mode-hook (paren-face-add-support lisp-font-lock-keywords-2))
(add-hook 'lisp-interaction-mode-hook (paren-face-add-support lisp-font-lock-keywords-2))
(provide 'parenface)
;; parenface.el ends here