From: "Andreas Röhler" <andreas.roehler@easy-emacs.de>
To: Emacs developers <emacs-devel@gnu.org>
Subject: more than one prefix argument
Date: Tue, 26 Jul 2011 21:59:08 +0200 [thread overview]
Message-ID: <4E2F1C8C.9010802@easy-emacs.de> (raw)
Hi,
what about allowing more than one prefix argument
by making interactive codes "p" and "P" sending
truly separated.
Would reserve "p" for numerical args, while "P"
basically should send a kind of exception flag,
branching execution.
Below a use-case for it, yank-repeat should add
newlines if C-u follows the numeric argument.
As both inputs interfere, that's not possible that way
for now.
;; not working now
(defun yank-repeat-newline (arg &optional nl)
"With numerical ARG, repeat last yank ARG times.
With optional arg NL, also insert newlines. "
(interactive "p\nP*")
(let ((nl nl)
(num arg))
(dotimes (i num)
(if nl
(insert (concat (car kill-ring) "\n"))
(insert (car kill-ring))))))
Drew presented a solution at help-gnu-emacs@gnu.org:
;;;;;;;;;;;;;;;;;
As Teemu explained, there is only _one_ prefix arg. You can look at
either its
numeric value or its raw value or both, but there is only ONE prefix arg.
You apparently want to have a prefix arg express both a numeric quantity
and a
boolean. If the user uses C-u (or its variants) to specify a (non-nil)
prefix
arg then, well, the raw value is non-nil. If the raw value is nil, then the
user did not use C-u (or its variants).
If you want to let the user specify a numeric value, default 1, and also
specify
whether to add a newline, then one way to do that is to distinguish positive
from negative prefix arg (there's your boolean).
E.g.:
M-x yank... -> just one, no newline
M-- yank... -> one, newline
C-u -1 yank... -> one, newline
C-u -2 yank... -> two, newlines
C-u 2 yank... -> two, no newlines
Something like this:
(defun myyank (&optional arg)
(interactive "p")
(dotimes (i (abs arg))
(if (natnump arg)
(insert (car kill-ring))
(insert (concat (car kill-ring) "\n")))))
;;;;;;;;;;;;;
However, that solution seems too complicated for a
part of non-programmers, it's not mnemonic, rather
tricky - even not uncommon in Emacs.
Would be glad to have C-u as general branch key.
Thanks all,
Andreas
--
https://launchpad.net/python-mode
https://launchpad.net/s-x-emacs-werkstatt/
next reply other threads:[~2011-07-26 19:59 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-26 19:59 Andreas Röhler [this message]
2011-07-26 20:10 ` more than one prefix argument 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
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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