Re: sometimes we don't want org-src to remove tabs [WAS: Re: tangle and Makefile]]

[Carsten Dominik <carsten.dominik@gmail.com>]

On Jan 28, 2010, at 4:47 PM, Dan Davison wrote:

> "Martin G. Skjæveland" <martige@ifi.uio.no> writes:
>
>> Hi,
>>
>> I have two questions regarding org-babel-tangle and Makefile.
>>
>> Running org-babel-tangle on the following file
>>
>> ----------------------------------start
>> * test
>>
>> #+begin_src makefile :tangle Makefile
>>  test:
>>          echo "hello"
>> #+end_src
>> ----------------------------------end
>>
> [...]
>> When I use this makefile
>>
>>  $make -f Makefile. test
>>
>> I get
>>
>>  Makefile.:4: *** missing separator (did you mean TAB instead of 8
>>  spaces?). Stop.
>>
>> even though I used TAB and not space when editing the Makefile  
>> code. How
>> can I avoid TABs being converted to space?
>
> Hi again Martin,
>
> This is more to do with org-mode sensu strictu (non-babel). When you
> exit a code edit buffer, tabs are automatically converted to
> spaces. There is an org-mode variable org-src-preserve-indentation  
> which
> already has a few different effects. Perhaps a solution is to add
> not_removing_tabs to the effects of this variable, as in the patch
> below. I can't think off hand what that's going to break -- anyone?
>
> Dan
>
>
> From d854544d24377434c2ace13aac45e85e42bcc7aa Mon Sep 17 00:00:00 2001
> From: Dan Davison <davison@stats.ox.ac.uk>
> Date: Thu, 28 Jan 2010 10:36:29 -0500
> Subject: [PATCH] org-src: Don't remove tabs when org-src-preserve- 
> indentation is non-nil
>
> ---
> lisp/org-src.el |    2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/lisp/org-src.el b/lisp/org-src.el
> index cdad99b..1d155cc 100644
> --- a/lisp/org-src.el
> +++ b/lisp/org-src.el
> @@ -525,7 +525,7 @@ the language, a switch telling if the content  
> should be in a single line."
> 			   org-edit-src-content-indentation))
> 	 (preserve-indentation org-src-preserve-indentation)
> 	 (delta 0) code line col indent)
> -    (untabify (point-min) (point-max))
> +    (unless preserve-indentation (untabify (point-min) (point-max)))
>     (save-excursion
>       (goto-char (point-min))
>       (if (looking-at "[ \t\n]*\n") (replace-match ""))
> -- 
> 1.6.3.3

If you have an *indented* code block where the #+begin src is already  
indented, this might mess up the relative indentation in the Org-mode  
buffer because TAB can
land on odd places in the line.  But I can see that this is a problem  
with Makefiles, so please apply the patch.

Thanks

- Carsten


- Carsten