From: "Andreas Röhler" <andreas.roehler@online.de>
To: "Stephen J. Turnbull" <stephen@xemacs.org>
Cc: emacs-devel@gnu.org, Lennart Borgman <lennart.borgman@gmail.com>,
Stefan Monnier <monnier@IRO.UMontreal.CA>,
Antoine Levitt <antoine.levitt@gmail.com>
Subject: Re: Errors in interactive commands
Date: Wed, 03 Aug 2011 12:31:01 +0200 [thread overview]
Message-ID: <4E392365.2080401@online.de> (raw)
In-Reply-To: <8739hij1y3.fsf@uwakimon.sk.tsukuba.ac.jp>
Am 03.08.2011 11:09, schrieb Stephen J. Turnbull:
> Andreas Röhler writes:
>
> > Useful return values of "forward-" is important for a wide range of
> > things, not just to serve several specific cases.
>
> Unfortunately, when there are "several specific cases", they often
> have different requirements. Your term "useful" is undefined,
obviously
and you
> need to define it and show that there is a unified definition powerful
> enough to make it worthwhile to introduce a backward-incompatible
> change.
>
> One way to present such definitions is to describe use cases. Mine is
> an important one: "iterating over a presumed-to-be array-structured
> buffer, executing a destructive action on each element of the structure."
>
> On the other hand, your pseudo-code is way too "pseudo" to be useful
> to me. Please *define* the functions that check and update
> "delete-second-state". I think you will find it is rather hard to do
> as efficiently as my code, without duplicating my code (perhaps
> implicitly).
>
>
for example the implemented form forward-word already sends nil, not
error, when buffer-end is reached. Remains still to get it messaged.
Thus implemented forward-word would allow a similar writing as below.
However, that is not convention in Emacs Lisp yet.
Also the return of `t' isn't as useful as `point' IMHO
Maybe the following function using `(setq erg'
might provide sense onto the terms missed definition:
(defun my-collects ()
"Report and return all word boundaries in current buffer, a list. "
(interactive)
(goto-char (point-min))
(let ((positions-reached nil)
(word-bounderies nil)
erg bnds)
(while (setq erg (ar-forward-word-atpt))
(add-to-list 'positions-reached erg)
(setq bnds (ar-bounds-of-word-atpt))
(add-to-list 'word-bounderies bnds))
(when (interactive-p) (message "positions-reached: %s"
positions-reached))
(when (interactive-p) (message "word-bounderies: %s" word-bounderies))
;; positions-reached
word-bounderies
))
Just try to write that with means commonly available.
To get
(ar-forward-word-atpt)
thing-at-point-utils.el and thingatpt-utils-base.el
from
https://launchpad.net/s-x-emacs-werkstatt/
is needed
Andreas
--
https://launchpad.net/python-mode
https://launchpad.net/s-x-emacs-werkstatt/
next prev parent reply other threads:[~2011-08-03 10:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-02 17:46 Errors in interactive commands Antoine Levitt
2011-08-02 19:04 ` Andreas Röhler
2011-08-02 19:15 ` Lennart Borgman
2011-08-02 19:18 ` Lars Magne Ingebrigtsen
2011-08-03 7:13 ` Stephen J. Turnbull
2011-08-03 9:28 ` Lennart Borgman
2011-08-02 19:25 ` Stefan Monnier
2011-08-02 19:36 ` Lennart Borgman
2011-08-03 6:13 ` Andreas Röhler
2011-08-03 7:28 ` Stephen J. Turnbull
2011-08-03 7:46 ` Andreas Röhler
2011-08-03 8:08 ` David Kastrup
2011-08-03 8:34 ` Andreas Röhler
2011-08-03 9:09 ` Stephen J. Turnbull
2011-08-03 10:31 ` Andreas Röhler [this message]
2011-08-04 2:15 ` Stephen J. Turnbull
2011-08-03 9:37 ` Lennart Borgman
2011-08-03 9:45 ` Andreas Schwab
2011-08-03 14:41 ` Stefan Monnier
2011-08-03 15:01 ` Lennart Borgman
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