From: Tassilo Horn <tassilo@member.fsf.org>
To: help-gnu-emacs@gnu.org
Subject: Re: why alias man to woman doesn't work?
Date: Thu, 05 Apr 2012 12:52:14 +0200 [thread overview]
Message-ID: <8762deqwm9.fsf@thinkpad.tsdh.de> (raw)
In-Reply-To: 80k41u4ohg.fsf@somewhere.org
"Sebastien Vauban"
<wxhgmqzgwmuf@spammotel.com> writes:
Hi Sebastien,
> Do I understand correctly that the above code will load `woman' when
> being parsed, while:
>
> (eval-after-load "woman" '(defalias 'man 'woman))
>
> would wait until woman was invoked by some other command?
Not until woman was invoked, but until woman.el is loaded. You can also
write
(eval-after-load 'woman '(...))
which would evaluate the quoted form after the feature woman has been
provided. Usually, (provide 'foo) is the last form in a file foo.el, so
in most cases both are equivalent.
> If yes, for performance reasons, one should prefer the latter writing,
> in order to have a quicker startup time of Emacs, right?
Nobody *should*, but it's a possibly way to speed up emacs startup time.
For example, all customizations for programming modes need not be done
until you visit a file of that language.
I have a small macro for that, because I always forget that the form
given to eval-after-load has to be quoted and to have an implicit progn.
--8<---------------cut here---------------start------------->8---
(defmacro th-defer-eval (feature &rest forms)
"Defer evaluation of FORMS after FEATURE has been provided.
A shorthand for
(eval-after-load 'FEATURE
'(progn
FORMS))
used like
(th-defer-eval foobar
(do-this-after-loading-foobar)
(do-that-after-loading-foobar))"
(declare (indent defun))
`(eval-after-load (quote ,feature)
'(progn
,@forms)))
--8<---------------cut here---------------end--------------->8---
Bye,
Tassilo
next prev parent reply other threads:[~2012-04-05 10:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-04 23:50 why alias man to woman doesn't work? Xah Lee
2012-04-05 1:28 ` Stefan Monnier
2012-04-05 7:02 ` Xah Lee
2012-04-05 7:38 ` Sebastien Vauban
2012-04-05 10:52 ` Tassilo Horn [this message]
2012-04-05 13:02 ` Doug Lewan
2012-04-05 14:19 ` Stefan Monnier
2012-04-05 14:38 ` Sebastien Vauban
2012-04-06 21:28 ` Xah Lee
2012-04-10 2:39 ` Stefan Monnier
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