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From: goncholden <goncholden@protonmail.com>
To: Corwin Brust <corwin@bru.st>
Cc: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>,
	Emanuel Berg <moasenwood@zoho.eu>
Subject: Re: Function passing flag
Date: Tue, 08 Mar 2022 20:28:22 +0000	[thread overview]
Message-ID: <yoe8k6YKC0rBdvf-3GNHwY5GxDnE-I07UV_oYZAKAUAVJiitMLeKs-UD8rMf0MnK6c8mRfutbc8Uz9J55bMH3XPVkyKDUVQVhl_moGEQzgY=@protonmail.com> (raw)
In-Reply-To: <CAJf-WoS68on6yMAu6T=VYpUGr+p8OWeiqmm9bh5D7N6TGujr4Q@mail.gmail.com>


------- Original Message -------

On Tuesday, March 8th, 2022 at 8:09 PM, Corwin Brust <corwin@bru.st> wrote:

> On Tue, Mar 8, 2022 at 1:36 PM goncholden goncholden@protonmail.com wrote:
>
> > How does one do it with an optional argument? Where can I read about this?
>
> A function with an optional argument ARG might look like this:
>
> (defun my:own-fun (&optional arg)
> "Do something. When ARG is non-nil do it a lot."
> (if arg
> ;; when ARG is true we run this
> (do-stuff)
> ;; else we run this
> (do-more-or-different-stuff)))

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.







  parent reply	other threads:[~2022-03-08 20:28 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-08 12:24 Function passing flag goncholden via Users list for the GNU Emacs text editor
2022-03-08 18:00 ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-08 19:00   ` goncholden
2022-03-08 19:14     ` Emanuel Berg via Users list for the GNU Emacs text editor
2022-03-08 19:35       ` goncholden
2022-03-08 20:09         ` Corwin Brust
2022-03-08 20:15           ` Corwin Brust
2022-03-08 20:28           ` goncholden [this message]
2022-03-08 20:42             ` Corwin Brust
2022-03-08 20:55               ` goncholden

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