Re: Toggle appointment notification

[Christopher Dimech <dimech@gmx.com>]

> Sent: Wednesday, December 02, 2020 at 1:37 PM
> From: tomas@tuxteam.de
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: help-gnu-emacs@gnu.org
> Subject: Re: Toggle appointment notification
>
> On Wed, Dec 02, 2020 at 01:05:07PM +0100, Christopher Dimech wrote:
> > > Sent: Wednesday, December 02, 2020 at 9:41 AM
> > > From: tomas@tuxteam.de
> > > To: help-gnu-emacs@gnu.org
> > > Subject: Re: Toggle appointment notification
> > >
> > > On Tue, Dec 01, 2020 at 10:44:09PM +0100, Michael Heerdegen wrote:
> > > > <tomas@tuxteam.de> writes:
> > > >
> > > > >   (message "my heading: %s" (prin1-to-string any))
> > > >
> > > > Or equivalent
> > > >
> > > >     (message "my heading: %S" any)
> > > >
> > > > , no?
> > >
> > > Indeed. Recommended reading "4.7 Formatting Strings" in the Emacs Lisp
> > > manual (in the Intertubes here [1]).
> >
> > How does one deal with conditionals (1, nil) in format?
>
> Care to pose a more complete example?
>
> As far as I understood you, you'd put a Lisp expression in the 2nd...nth
> arguments of (message fmt ...), but I might be misunderstanding you
> completely.

As I read it, the format it is mainly for numerical and strings.

  (format "%s" arbitrary-string)

Although it mentions printed representation of the object

I am sure users would be more interested is printing results
of expressions.

But I suppose one should use "print", "prin1", and "princ"
for that.

(print OBJECT)

However, a valid format specification for conditional could be.

(message "Result: %s" (> 5 3))

%s mentions objects, but the sections seems to imply attention
to strings in "4.7 Formatting Strings".

I think this is quite valid:

  (format "%s" arbitrary-string)

But perhaps not completely true.

> Cheers
>  - t
>