From: "Berry, Charles" via "General discussions about Org-mode." <emacs-orgmode@gnu.org>
To: akater <nuclearspace@gmail.com>
Cc: "emacs-orgmode@gnu.org" <emacs-orgmode@gnu.org>
Subject: Re: Self-sufficient Org file with customised export? :eval-when?
Date: Fri, 1 May 2020 18:14:17 +0000 [thread overview]
Message-ID: <B4B54324-5796-4A05-B039-36E24274E403@ucsd.edu> (raw)
In-Reply-To: <87imhgyfai.fsf@gmail.com>
> On Apr 30, 2020, at 11:55 AM, akater <nuclearspace@gmail.com> wrote:
>
[deleted - discussion of html export]
> -----
>
>
> If I may prematurely offer my vision: Common Lisp has special operator
> eval-when which specifies when the enclosed code is to be evaluated (or
> compiled). Example:
>
> (eval-when (:compile-toplevel) (defun f () ..))
>
> specifies that function f should be defined during compilation only.
>
> I believe it would be neat if Org-mode widely supported :eval-when
> header argument inspired by Common Lisp's eval-when. Usage examples
> would be:
>
> #+begin_src emacs-lisp :eval-when compile load
> ..
> #+end_src
>
You can effectively do this by using an elisp expression for the value of an :eval arg like this:
#+begin_src emacs-lisp :eval (or (bound-and-true-p my-eval-flag) "no")
"done"
#+end_src
which honors the value of `my-eval-flag' if there is one.
You can also use a call to a src block. e.g. `:eval my-src-block(a=1,b=2)'
HTH,
Chuck
prev parent reply other threads:[~2020-05-01 18:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 18:55 Self-sufficient Org file with customised export? :eval-when? akater
2020-05-01 18:14 ` Berry, Charles via General discussions about Org-mode. [this message]
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