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Re: Function passing flag
From: |
goncholden |
Subject: |
Re: Function passing flag |
Date: |
Tue, 08 Mar 2022 20:55:26 +0000 |
------- Original Message -------
On Tuesday, March 8th, 2022 at 8:42 PM, Corwin Brust <corwin@bru.st> wrote:
> On Tue, Mar 8, 2022 at 2:28 PM goncholden goncholden@protonmail.com wrote:
> > Would like to use arg as a switch so I can enable or disable some emacs
> > modes (customarily using
> > value of 1 to enable, and -1 to disable). If no arg is supplied, I would
> > like to enable the modes.
> > How would I define the parameter outside the function, and then pass it
> > through. I might require
> > a buffer local variable.
> One typical way of doing this would be to use the "universal
> argument", also known as a "prefix argument":
> (info "(elisp)Prefix Command Arguments")
> Here's an example that would create an interactive command that
> enables tool-bars and scroll-bars or, with a prefix argument, disables
> them.
> (defun my:enable-bars (&optional arg)
> "Enable `tool-bar-mode' and` scroll-bar-mode'.
> When ARG is non-nill, disable them."
> (interactive "P")
> (if arg
> (progn (tool-bar-mode -1)
> (scroll-bar-mode -1))
> (tool-bar-mode 1)
> (scroll-bar-mode 1)))
>
> Once you evaluate this you can ensure both tool-bar and scroll bar
> modes are active with:
> M-x my:enable-bar RET
>
> Or, to ensure both tool-bar and scroll-bar modes are disabled:
> C-u M-x my:enable-bar RET
Have done like this
(defun romona (&optional action)
"Enables or disables Emacs Bars"
;; If action in nil, set action to enable the bar modes
(unless action (setq action 1))
(if action
(progn (tool-bar-mode 1)
(scroll-bar-mode 1))
(progn (tool-bar-mode -1)
(scroll-bar-mode -1)) ))
Could just need a defvar.
- Function passing flag, goncholden, 2022/03/08
- Re: Function passing flag, Emanuel Berg, 2022/03/08
- Re: Function passing flag, goncholden, 2022/03/08
- Re: Function passing flag, Emanuel Berg, 2022/03/08
- Re: Function passing flag, goncholden, 2022/03/08
- Re: Function passing flag, Corwin Brust, 2022/03/08
- Re: Function passing flag, Corwin Brust, 2022/03/08
- Re: Function passing flag, goncholden, 2022/03/08
- Re: Function passing flag, Corwin Brust, 2022/03/08
- Re: Function passing flag,
goncholden <=