From: "Andreas Röhler" <andreas.roehler@online.de>
To: Tim Cross <theophilusx@gmail.com>
Cc: Daniel Colascione <dan.colascione@gmail.com>,
Drew Adams <drew.adams@oracle.com>,
emacs-devel@gnu.org
Subject: Re: more than one prefix argument
Date: Wed, 27 Jul 2011 12:21:32 +0200 [thread overview]
Message-ID: <4E2FE6AC.8070706@online.de> (raw)
In-Reply-To: <CAC=50j_yDhsX1ci_tM7+hTYBmFLr2py=nXw2Bx27aR-XTNNemQ@mail.gmail.com>
Am 27.07.2011 11:48, schrieb Tim Cross:
[ ... ]
>> Don't suggest additional code but a better use of "P" - no parallel
>> implementations. Having "P" as a branch-flag not affected by "p"
>>
>
> Sorry, just not quite following your argument.
>
> If we were to get rid of one, it would have to be the numeric version
> (i.e. p) rather than P as sometimes you need to be able to distinguish
> between nil and 1.
Could you give a case for that? IMHO we have to distinguish between nil
and t at these occasions. Looks like wrongly reffered c-style
limitation, which we gladly don't have business with.
> Essentially, we would need the raw form.
why?
We need a number or a boolean.
"p" should send a number, 1 as default.
"P" a boolean, nil as default.
This means
> that whenever you need to process the prefix argument as a number you
> will need to test and convert it to distinguish nil and extract the
> value from the list - this would be additional code ini your function.
>
> I don't understand what you mean by having a handy code for branching.
> Can you give an example of how this code would work and how a command
> using this code would be called?
>
How do you switch an alternative now?
Quite often that is done with an negative or positive numeric value.
(abbrev-mode -1)
(abbrev-mode 1)
Bad style IMHO, C-like obfuscating the code.
much better would be
(abbrev-mode nil)
(abbrev-mode t)
Cheers,
Andreas
> tim
>
next prev parent reply other threads:[~2011-07-27 10:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-26 19:59 more than one prefix argument Andreas Röhler
2011-07-26 20:10 ` Daniel Colascione
2011-07-26 20:36 ` Andreas Röhler
2011-07-26 20:57 ` Drew Adams
2011-07-26 20:36 ` Drew Adams
2011-07-27 6:25 ` Andreas Röhler
2011-07-27 9:25 ` Tim Cross
2011-07-27 9:37 ` Andreas Röhler
2011-07-27 9:48 ` Tim Cross
2011-07-27 10:21 ` Andreas Röhler [this message]
2011-07-27 11:21 ` Andreas Schwab
2011-07-27 11:46 ` Andreas Röhler
2011-07-27 12:39 ` Andreas Schwab
2011-07-27 12:51 ` Tim Cross
2011-07-27 12:46 ` Tim Cross
2011-07-27 15:09 ` Drew Adams
2011-07-27 9:38 ` Tim Cross
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