From: Aaron Ecay <aaronecay@gmail.com>
To: Matt Price <moptop99@gmail.com>, Org Mode <emacs-orgmode@gnu.org>
Subject: Re: using flet to suppress meta generation in html export?
Date: Tue, 06 Nov 2018 15:35:53 +0000 [thread overview]
Message-ID: <87a7mm2p7q.fsf@gmail.com> (raw)
In-Reply-To: <CAN_Dec94zwS-3PunRfkkYMvaCyKf3vzLcvqW_YR9VVmBABZuEw@mail.gmail.com>
Hi Matt,
2018ko azaroak 6an, Matt Price-ek idatzi zuen:
>
> Hi,
>
> I was writing a function to quickly post the ocntents of subtrees to the
> Canvas Learning Management System. I was trying to strip down the exported
> HTML to an absolute minimum and had forgotten about the body-only paramter
> to org-export-as (!!). So, my solution was to try to rebind
> 'org-html--build-meta-info to always just return "". However, I can't
> seem to do it properly and I'm wondering if someone can help me figure out
> what's wrong. It's my first time using cl-flet! And I know there are
> various approaches, but I odn't understnad whyt this is notworking, when
> for instance, this does work for me:
>
> (cl-flet ((+
> (lambda (&rest args) (message "no plus!"))))
> (+ "whoops"))
> ;; "no plus!"
>
> Meanwhile, here's my non-functional code:
Quoting from the info page (info "(cl) Function Bindings"):
The bindings are lexical in scope. This means that all references
to the named functions must appear physically within FORMS.
I believe that you can accomplish what you are trying to do with:
(cl-letf (((symbol-function 'org-html--build-meta-info)
(lambda (&rest args) "")))
your-code-here)
You could also do something like:
(let ((my-advice (lambda (&rest _) "")))
(advice-add 'org-html--build-meta-info :override my-advice)
(unwind-protect
(progn
your-code-here)
(advice-remove 'org-html--build-meta-info my-advice)))
(Why do I think this is better, despite being more verbose? Advice-add
is specifically designed to change the binding of functions at runtime,
and so it does some specialized things that cl-letf doesnʼt do. This in
turn means that it should be a more robust way of accomplishing the
desired outcome.)
--
Aaron Ecay
next prev parent reply other threads:[~2018-11-06 15:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-06 14:16 using flet to suppress meta generation in html export? Matt Price
2018-11-06 15:35 ` Aaron Ecay [this message]
2018-11-06 16:05 ` Matt Price
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