Re: auto-indenting C++ files upon saving

[Eric James Michael Ritz]

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Art Werschulz wrote:
> [...]
>
> How can this be automated, so that a file gets auto-indented whenever
> it's saved?
>
> I thinking of something along the lines of
> (setq auto-save-hook
>      (lambda
>      (mark-whole-region)
>      (indent-region)))
> but this didn't seem to work.
>
> Actually, I'd only want this to work in some situations, e.g., a file
> whose name matches a certain pattern.  Said pattern would be stored in
> some variable.
>
> My emacs-lisp is very weak.  Suggestions?  Thanks!

You should be able to add a hook to ‘before-save-hook’ to be called on
save that will indent the file for you.  If you specifically want this
for C++ files then it may be easier to check the current major mode to
see if it is in c++-mode, compared to trying to match against file
names for C++ files.  Maybe something like this?

(add-hook 'before-save-hook
          (lambda ()
            (when (eq 'c++-mode (buffer-local-value 'major-mode 
(current-buffer)))
              (mark-whole-buffer)
              (indent-region))))

I’m not very confident about my Emacs Lisp either, so there may be a
better way to have save-related hooks for specific modes :)

- --
Eric James Michael Ritz
Cyber Sprocket Labs
(843) 225-3830
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