On Dec 22, 2010, at 3:51 PM, Dan Davison wrote:
There's recently been some advocacy of using buffer-local variables
for
Org-mode configuration. It seems like a good idea to me. However, I
think that it raises a problem: there are at least two situations in
which Org internally spawns a buffer that is supposed to be a sort of
"copy" of another Org buffer: these situations are export and org-src
edit buffer. The problem is that the "copy" buffer doesn't inherit
local
variables from the parent buffer.
It seems that either we should propagate all local variables in these
cases (but I suspect that is inappropriate for some variables), or we
have to have a rule for identifying the subset of local variables
which
need to be propagated.
Below is one example which I think demonstrates a problem. If you
evaluate the elisp block and then export to HTML, the noweb does not
get
expanded, because the configuration variable is buffer-local (behind
the
scenes, Org creates a buffer copy just before exporting a buffer).
--8<---------------cut here---------------start------------->8---
#+title: Local variables issues?
Evaluate this block, then do C-c C-e h
#+begin_src emacs-lisp :results silent :exports none
(set-default 'org-babel-default-header-args:sh
nil)
(set (make-local-variable 'org-babel-default-header-args:sh)
'((:noweb . "yes")))
#+end_src
#+begin_src sh :exports both
<<foo>>
#+end_src
#+source: foo
#+begin_src sh :exports none
echo hello
#+end_src
--8<---------------cut here---------------end--------------->8---
It's also a problem when spawning the org-src edit buffer. There is a
patch in the pipeline that tries to identify all the necessary local
variables and transmit them to the edit buffer:
http://patchwork.newartisans.com/patch/438/
That's a bit messy, but in the export case it seems even harder to
identify all variables that might need to be transmitted.
What is a good solution?
Hi Dan,
I see only two possibilities. Either use a list of variables that
should be transported, or copy all local variables, or all local
variables that match a pattern. An example for doing something like
this can be found in org-get-local-variables which is, for example,
used by `org-run-like-in-org-mode'.
- Carsten
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