Re: Patch: Syntax and Hard Newlines

[Herbert Euler]

> > No, `kill-local-variable' only makes a variable no longer have a
> > separate value in the current buffer.
>
> That's what I meant.  For example, in cc-mode.el you have
>
>     (when (boundp 'parse-sexp-lookup-properties)
>       (make-local-variable 'parse-sexp-lookup-properties)
>       (setq parse-sexp-lookup-properties t))
>
> that is cc-mode makes a "separate value in the current buffer" and sets
> that locally to t.  When you turn off longlines in that buffer you turn
> that off for cc-mode too.  Or am I missing something?

No, `make-local-variable' makes a variable local to a buffer,
not to a mode:

(setq b1 (get-buffer-create "b1"))
==> #<buffer b1>
(setq b2 (get-buffer-create "b2"))
==> #<buffer b2>
(save-window-excursion (switch-to-buffer b1)
                      (c-mode)
                      major-mode)
==> c-mode
(save-window-excursion (switch-to-buffer b2)
                      (c-mode)
                      major-mode)
==> c-mode
parse-sexp-lookup-properties
==> nil
(save-window-excursion (switch-to-buffer b1)
                      parse-sexp-lookup-properties)
==> nil
(save-window-excursion (switch-to-buffer b2)
                      parse-sexp-lookup-properties)
==> nil
(save-window-excursion (switch-to-buffer b1)
                      (make-local-variable 'parse-sexp-lookup-properties)
                      (setq parse-sexp-lookup-properties t)
                      parse-sexp-lookup-properties)
==> t
(save-window-excursion (switch-to-buffer b2)
                      (make-local-variable 'parse-sexp-lookup-properties)
                      (setq parse-sexp-lookup-properties nil)
                      parse-sexp-lookup-properties)
==> nil
parse-sexp-lookup-properties
==> nil
(save-window-excursion (switch-to-buffer b1)
                      (kill-local-variable 'parse-sexp-lookup-properties)
                      parse-sexp-lookup-properties)
==> nil
(save-window-excursion (switch-to-buffer b2)
                      parse-sexp-lookup-properties)
==> nil
(save-window-excursion (switch-to-buffer b2)
                      (setq parse-sexp-lookup-properties t)
                      parse-sexp-lookup-properties)
==> t
parse-sexp-lookup-properties
==> nil

Regards,
Guanpeng Xu

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