From: Andreas Politz <politza@fh-trier.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Programmatically creating functions
Date: Tue, 21 Oct 2008 20:57:56 +0200 [thread overview]
Message-ID: <1224615828.488025@arno.fh-trier.de> (raw)
In-Reply-To: <87r669lrvk.fsf@zeekat.nl>
Joost Diepenmaat wrote:
> Ian Eure <ian@digg.com> writes:
>
>> So, I have a list of symbols:
>>
>> '(foo bar baz)
>>
>> I want to iterate over the list and create a function from each which
>> does something like this:
>>
>> (defun call-foo ()
>> (interactive)
>> (invoke-stuff 'foo)
>>
>> How can I accomplish this? I can't figure out how to create the
>> function. I've tried a number of approaches, but have not met with
>> success.
>>
>> - eval'ing the defun. Returns a function symbol, but I can't call
>> it. Maybe it's only created within the scope of the (eval) and not
>> callable from outside?
>>
>> - Creating a symbol and using fset to assign a lambda to it's
>> function cell. It sort of works, but I'm unclear on how to pass a
>> variable function name to defun, nor am I clear on how I can make sure
>> it calls invoke-stuff with the right symbol.
>
> I'm not /quite/ sure where you've got problems, but in this case elisp's
> lack of closures hurts. IMHO the simplest way to get what you want is to
> use a macro:
>
> (defmacro make-caller-macro (symbol)
> `(defun ,(intern (concat "call-" (symbol-name symbol))) ()
> (,symbol)))
>
> But that won't evaluate the argument, so you'd more or less have to use
> eval as well:
>
> (dolist (s '(foo bar)) (eval `(make-caller-macro ,s)))
>
Does this work ? (in general)
(defun make-fun (name)
(fset (intern (format "call-%s" name))
`(lambda nil
,(format "call-%s is a very good function." name)
(interactive)
(message "I was once %s" (quote ,name)))))
(mapcar 'make-fun '(foo bar baz))
(describe-function 'call-baz)
(call-bar)
-ap
next prev parent reply other threads:[~2008-10-21 18:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1730.1224610023.25473.help-gnu-emacs@gnu.org>
2008-10-21 18:22 ` Programmatically creating functions aartist
2008-10-21 18:34 ` Joost Diepenmaat
2008-10-21 18:57 ` Andreas Politz [this message]
2008-10-25 18:28 ` Ian Eure
[not found] ` <mailman.2073.1224959342.25473.help-gnu-emacs@gnu.org>
2008-10-28 20:29 ` Emil
2008-10-21 17:26 Ian Eure
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