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Re: Changing buffer-local variables to cycle emacs options
From: |
steve-humphreys |
Subject: |
Re: Changing buffer-local variables to cycle emacs options |
Date: |
Tue, 29 Dec 2020 07:28:51 +0100 |
;;(defvar gstate 0)
(defun gstate-cycle ()
"Toggle Display-Line-Numbers mode in all buffers."
(interactive)
(let ((n gstate))
(pcase n
(1 (setq-local gstate 2)
(message "%s" "gstate 1"))
(2 (setq-local gstate 3)
(message "%s" "gstate 2"))
(_ (setq-local gstate 1)
(message "%s" "gstate _")) )))
(global-set-key (kbd "H-1") #'gstate-cycle)
> Sent: Tuesday, December 29, 2020 at 10:43 AM
> From: steve-humphreys@gmx.com
> To: "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> Subject: Changing buffer-local variables to cycle emacs options
>
> I am getting the following Lisp error
>
> Debugger entered--Lisp error: (void-variable gstate)
> (let ((n gstate)) (cond ((eql n 1) (set (make-local-variable 'gstate) 2)
> (message "%s" "gstate 1")) ((eql n 2) (set (make-local-variable 'gstate) 3)
> (message "%s" "gstate 2")) (t (set (make-local-variable 'gstate) 1) (message
> "%s" "gstate _"))))
> gstate-cycle()
> funcall-interactively(gstate-cycle)
> call-interactively(gstate-cycle nil nil)
> command-execute(gstate-cycle)
>
> I am using the function below. The problem occurs when I comment out
> "(defvar gstate 0)". When I introduce the variable, the Lisp Error is
> not reported.
>
> One confusion that exists is that I want gstate buffer-local. But I think
> that using defvar is a mistake. Another think is to avoid defining gstate
> before calling the function. My plan was to have "pcase" do to the "(_"
> part if the buffer-local variable "gstate" is not defined, and then define
> it using "(setq-local gstate 1)".
>
> How can I code this properly?
>
> -------- code --------
>
> ;;(defvar gstate 0)
>
> (defun gstate-cycle ()
> (interactive)
>
> (let ((n gstate))
>
> (pcase n
> (1 (setq-local gstate 2)
> (message "%s" "gstate 1"))
>
> (2 (setq-local gstate 3)
> (message "%s" "gstate 2"))
>
> (_ (setq-local gstate 1)
> (message "%s" "gstate _")) )))
>
> (global-set-key (kbd "H-1") #'gstate-cycle)
>
>
>
>
>
>