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more than one prefix argument
From: |
Andreas Röhler |
Subject: |
more than one prefix argument |
Date: |
Tue, 26 Jul 2011 21:59:08 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; de; rv:1.9.2.18) Gecko/20110616 SUSE/3.1.11 Thunderbird/3.1.11 |
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 address@hidden:
;;;;;;;;;;;;;;;;;
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/
- more than one prefix argument,
Andreas Röhler <=
- Re: more than one prefix argument, Daniel Colascione, 2011/07/26
- Re: more than one prefix argument, Andreas Röhler, 2011/07/26
- RE: more than one prefix argument, Drew Adams, 2011/07/26
- Re: more than one prefix argument, Andreas Röhler, 2011/07/27
- Re: more than one prefix argument, Tim Cross, 2011/07/27
- Re: more than one prefix argument, Andreas Röhler, 2011/07/27
- Re: more than one prefix argument, Tim Cross, 2011/07/27
- Re: more than one prefix argument, Andreas Röhler, 2011/07/27
- Re: more than one prefix argument, Andreas Schwab, 2011/07/27