[ESS] [R] Indentation in R code
Martin Maechler
maechler at stat.math.ethz.ch
Mon Sep 26 09:27:56 CEST 2005
I'm crossposting to the ESS-help mailing list which is slightly
more appropriate here. [This may be a rare case where
crossposting seems to make much sense.]
>>>>> "PD" == Peter Dalgaard <p.dalgaard at biostat.ku.dk>
>>>>> on 25 Sep 2005 19:40:45 +0200 writes:
PD> Seth Falcon <sfalcon at fhcrc.org> writes:
>> On 24 Sep 2005, goran.brostrom at gmail.com wrote:
>>
>> > I am using emacs-21.3 when writing R functions on Linux debian, and
>> > I am trying to follow the advice i R-exts.pdf (2.1.1) regarding
>> > indentation. That is, I set 'c-default-style' to "bsd" and
>> > 'c-basic-offset' to 4. However, while this gives me the intended
>> > indentation in C code, it doesn't change the behavior in R code; I
>> > still get an indentation of size 2. This is my .emacs file after
>> > customization:
>> >
>> > (require 'ess-site)
>> > (custom-set-variables
>> > ;; custom-set-variables was added by Custom -- don't edit or
>> > ;; cut/paste it! Your init file should contain only one such
>> > ;; instance.
>> > '(c-basic-offset 4)
>> > '(c-default-style "bsd"))
>> > (custom-set-faces
>> > ;; custom-set-faces was added by Custom -- don't edit or cut/paste it!
>> > ;; Your init file should contain only one such instance.
>> > )
>>
>> Not sure if this is the best way, but I have the following after
>> loading ess-site:
>>
>> (setq ess-indent-level 4)
PD> I have (I believe it stems from Martin M. originally):
yes, most probably {IIRC, Kurt Hornik was involved too}.
PD> (add-hook 'c-mode-hook '(lambda()
PD> (c-set-style "stroustrup")))
the above is not quite what I have or did recommend,
which is rather "bsd" + "offset 4" as Göran has above
In fact, Göran mentions the "R-exts" manual and that has
the following *before* giving the emacs-lisp statements:
>> (For GNU Emacs 20: for GNU Emacs 21 use
>> customization to set the `c-default-style' to `"bsd"' and
>> `c-basic-offset' to `4'.)
and indeed, that's what Göran did and you should do with a
current emacs, either customize via GUI or,
in your ~/.emacs file, find the section '(custom-set-variables ...)' and add
'(c-basic-offset 4)
'(c-default-style "bsd")
to the lines already there, or if there's no such section, add
(custom-set-variables
;; custom-set-variables was added by Custom -- don't edit or cut/paste it!
;; Your init file should contain only one such instance.
'(c-basic-offset 4)
'(c-default-style "bsd")
)
to the end of your ~/.emacs file
PD> (add-hook 'ess-mode-hook
PD> '(lambda()
PD> (if (or (string< ess-version "5.0")
PD> (string= ess-version "5.0"))
PD> (ess-set-style 'C++)
PD> (ess-set-style 'C++ 'quiet))
PD>
PD> (add-hook 'local-write-file-hooks
PD> '(lambda()
PD> (delete-trailing-whitespace)
PD> ))
PD> ))
yes; using (add-hook .......) is really more clean than first
requiring ess-site.
Also, since nowadays I assume everyone has an ess-version >= 5,
the above becomes simply
(add-hook 'ess-mode-hook
'(lambda()
(ess-set-style 'C++ 'quiet)
(add-hook 'local-write-file-hooks
'(lambda()
(delete-trailing-whitespace)))))
Note that this has the standard e-lisp function
'delete-trailing-whitespace' which is simpler but also less
flexible than the 'ess-nuke-trailing-whitespace' which we've had
there.
Martin Maechler, ETH Zurich
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