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bug#13422: 24.2.91; Feature request: Add a macro always expanding to nil
From: |
Michael Heerdegen |
Subject: |
bug#13422: 24.2.91; Feature request: Add a macro always expanding to nil |
Date: |
Sat, 12 Jan 2013 18:58:00 +0100 |
Hi,
I want to request to add something like this to subr.el or similar:
(defmacro-safe discard (&rest args)
"Do nothing, do not even eval ARGS, and return nil."
nil)
I.e., a counterpart of `ignore', as a macro.
What at first might seem a silly idea is indeed useful: I use it as a
possibility to uncomment code. Compared with normal uncommenting (M-;),
it has several advantages:
1. You can search for occurrences of `discard' to find such uncommented
code. Searching for "^;" would also give you text comments.
2. Paren matching, moving by sexps and such things, still work
normally.
3. The code inside the `discard' is still font-locked.
4. It is easy to copy and paste parts of discarded code. Inside real
comments, you always copy the commenting characters (;) along with the
code and have to remove it manually, which is annoying.
Just an idea. But it's IMHO useful for the end user, as a mean of
editing the Emacs init file. Of course, it would be easy to define it
in the init file itself, but I doubt that many people would have the
idea to do so.
Thanks,
Michael.
In GNU Emacs 24.2.91.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10)
of 2012-12-30 on drachen
Bzr revision: rgm@gnu.org-20121230122326-m6gw29pkwjgwqf9d
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
System Description: Debian GNU/Linux testing (wheezy)
Configured using:
`configure '--prefix=/usr/local/built/''
Important settings:
value of $LC_ALL: de_DE.utf8
value of $LC_TIME: C
value of $LANG: de_DE.utf8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
- bug#13422: 24.2.91; Feature request: Add a macro always expanding to nil,
Michael Heerdegen <=
bug#13422: 24.2.91; Feature request: Add a macro always expanding to nil, Stefan Monnier, 2013/01/12