Re: whitespace issues

[Rusi]

On Wednesday, July 1, 2015 at 4:57:21 AM UTC+5:30, Emanuel Berg wrote:
> Rusi  writes:
> 
> > 1. Is it possible to have some sort of save-hook so
> > that all leading (indentation) whitespace is cleaned
> > up to space alone and tabs are removed?
> 
> Do this and indentation will be in whitespaces only:
> 
>     (setq-default indent-tabs-mode nil)
> 
> Only in Makefiles you still get tabs - otherwise they
> (the Makefiles) won't work.
> 
> But to answer your question, yes, you can use
> `before-save-hook' and `untabify'.
> 
> If you want to add exceptions, it could look like
> this:
> 
>     (defun untab-all ()
>       (unless (member major-mode '(makefile-gmake-mode
>                                    makefile-mode) ) ; exceptions
>         (untabify (point-min) (point-max)))
>       nil) ; tell 'did not write buffer to disk'
> 
> But I think it is better to have the file as you edit
> it be as close to the finished form as possible, and
> not have it post-processed like that.

Ok thanks Emanuel, Jorge
Putting your two together  I have

--------------------
(add-hook 'before-save-hook
          'untab-python
)

(defun untab-python ()
      (when (member major-mode '(python-mode))
        (untabify (point-min) (point-max)))
      nil)
----------------------

1. dunno about the save-excursion
2. member rather than equal/eq so that other modes can be added as desired