Re: Inheriting some local variables from source code block editing buffers

[Aaron Ecay <aaronecay@gmail.com>]

2018ko maiatzak 1an, Göktuğ Kayaalp-ek idatzi zuen:
> 
> On 2018-05-01 20:35 +01, Aaron Ecay <aaronecay@gmail.com> wrote:
>> Thinking about it some more, lexical binding is not a good case for
>> this feature, since it has to be set not only in the edit buffer, but
>> also when C-c C-c is used in the org-mode buffer to evaluate the src
>> block.  The :lexical header arg (which I did not know about) works for
>> the latter but not the former.  To complete the picture, Someone™ needs
>> to implement a org-babel-edit-prep:emacs-lisp function which looks for
>> :lexical yes in the header arguments and sets the value in the edit
>> buffer appropriately.
> 
> I can (and plan to) take on that task once a design is agreed upon.  I
> don't really know much about Org internals, but I think I can figure
> out.

That is excellent news :) If you run into anything you canʼt figure out
then let us know.

> 
>> If lexical-binding is the major motivating factor, then maybe the above
>> is enough.  My original suggestion was for something like:
>> 
>> #+begin_src emacs-lisp :edit-vars ((fill-column 72) (other-var other-val))
>> ...
>> #+end_src
>> 
>> This would set the variables in the edit buffer in the (hopefully)
>> obvious way.  It is not implemented yet, though.
> 
> I do like that syntax.  A minor addition might be for the case when one
> wants to pass the value of a variable local to the org buffer to the
> editing buffer:

That looks fine to me.

> 
> -*- fill-column: 65; indent-tabs-mode: nil -*-
> #+edit-vars: (indent-tabs-mode)

A minor note, the above line should read:
#+header: :edit-vars (indent-tabs-mode)

> #+begin_src emacs-lisp :edit-vars (fill-column (lexical-binding t))

But because of the nature of the variable (a lisp list), it can only be
set once.  So you can have only one of:
#+header :edit-vars ...
OR
#+begin_src emacs-lisp :edit-vars ...
OR
#+property: header-args:emacs-lisp :edit-vars ...
OR
:PROPERTIES:
:header-args:emacs-lisp: :edit-vars ...
:END:

But they canʼt be combined.  AFAIR, :var is the only header argument
that can be meaningfully specified more than once.

-- 
Aaron Ecay