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Re: [O] babel perl issue

From: Eric Schulte
Subject: Re: [O] babel perl issue
Date: Mon, 10 Dec 2012 08:11:37 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

Achim Gratz <address@hidden> writes:

> Eric Schulte writes:
>> See http://orgmode.org/manual/Languages.html for the documentation on
>> how to activate and disable org-babel languages.
> That actually produces the error:
> File mode specification error: (void-variable org-babel-tangle-lang-exts)
> as the OP has found out (and I can reproduce it).

Using this method of requiring languages,

    ;; emacs-lisp
      '((perl . t)))

Works for me without issue when called from a fresh emacs (-Q).  This is
the recommended way of adding support for a new language and should work
for the OP.

> The reason is that none of the ob-<lang>.el files do a (require
> ob-tangle), but try to change a defcustom in ob.tangle.el that is only
> declared, but not yet available at the time.

The two fixes seem to be either to either (1) add (require 'ob-tangle)
to all current and new language specific files, or (2) merge ob-tangle
into ob.el, so that they are both loaded by (require 'ob).  It is
unfortunate that because of the recursive require there is no way to
separate a single require'd entity across multiple files.

Option (2) seems most clean to me.  Unless anyone has a better idea I'll
make this change.


Eric Schulte

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