GOP2-4: add script for batch indenting Scheme files

GOP2-4: add script for batch indenting Scheme files

Establish some coding styles in Emacs

This uses directory variables to enforce some coding style features in
C++, Scheme and Texinfo files in the source tree.

[John Mandereau, 2012-08-20 10:00:44]

Note: these two new files (.dir-locals.el from David Kastrup and fixscm.sh from
me) actually operate independently, see
http://lists.gnu.org/archive/html/lilypond-devel/2012-08/msg00450.html

and so they may be applied independently one from the other; if both are
applied, they will be in separate commits.

[dak, 2012-08-20 10:11:57]

http://codereview.appspot.com/6450162/diff/1/scripts/auxiliar/fixscm.sh
File scripts/auxiliar/fixscm.sh (right):

http://codereview.appspot.com/6450162/diff/1/scripts/auxiliar/fixscm.sh#newco...
scripts/auxiliar/fixscm.sh:15: emacs -batch "$@" --eval "${elisp_expression}"
Can you verify that emacs -batch indeed obeys directory-local variables? 
Otherwise the above info is quite off.

[dak, 2012-08-20 10:50:11]

John Mandereau <john.mandereau@gmail.com> writes:

> Il giorno lun, 20/08/2012 alle 10.11 +0000, dak@gnu.org ha scritto:
>> http://codereview.appspot.com/6450162/diff/1/scripts/auxiliar/fixscm.sh
>> File scripts/auxiliar/fixscm.sh (right):
>> 
>>
http://codereview.appspot.com/6450162/diff/1/scripts/auxiliar/fixscm.sh#newco...
>> scripts/auxiliar/fixscm.sh:15: emacs -batch "$@" --eval
>> "${elisp_expression}"
>> Can you verify that emacs -batch indeed obeys directory-local variables?
>
>
>>   Otherwise the above info is quite off
>
> This info is off whether Emacs -batch obeys dir-local variables or not:
> from your comment on -devel the directory-local settings you propose
> (indent-tabs-mode in scheme-mode) is not used by this script.  I'm
> resending a patch.

Sigh.  I have _never_ been proposing indent-tabs-mode in scheme-mode,
and most certainly my patch proposal was _quite_ the opposite, with the
_opposite_ effect.

Please don't further spread that myth.

It is not my fault that the Emacs-written Lisp print form of
(indent-tabs-mode . nil) happens to be (indent-tabs-mode).

Yes, it looks like calling a function indent-tabs-mode in that _quoted_
alist.  Emacs has no such function or minor mode.  It only has the
imprudently named _variable_ indent-tabs-mode which is set to _nil_
(!!!!) when the form written out by _Emacs_ into the .dir-locals.el file
is later interpreted as an alist.  Emacs wrote that as a result of using
M-x add-dir-local-variable RET.

-- 
David Kastrup