The post-command-hook approach worked like a charm.  Thanks!
-steve

On Wed, Jul 22, 2009 at 11:23 AM, Stefan Monnier
<monnier@iro.umontreal.ca>wrote:

> > I have a minor mode that wishes to disable itself when the buffer becomes
> > writable, but I do not see a way to do it.
>
> Indeed, there is no such hook.  I can think of two ways to get something
> similar:
> - use the usual post-command-hook to check the state of the
>  variable and react accordingly.
> - if your minor mode is mostly a bunch of key-bindings, you can do what
>  I did in diff-mode and use buffer-read-only as the minor-mode
>  variable:
>
>  [...]
>  ;; Neat trick from Dave Love to add more bindings in read-only mode:
>  (lexical-let ((ro-bind (cons 'buffer-read-only diff-mode-shared-map)))
>    (add-to-list 'minor-mode-overriding-map-alist ro-bind)
>    ;; Turn off this little trick in case the buffer is put in view-mode.
>    (add-hook 'view-mode-hook
>              (lambda ()
>                (setq minor-mode-overriding-map-alist
>                      (delq ro-bind minor-mode-overriding-map-alist)))
>              nil t))
>  [...]
>
>
> -- Stefan
>