Re: [Qemu-devel] [PATCH v2] Add .dir-locals.el file to configure emacs coding style

[Peter Maydell]

On 4 June 2015 at 14:30, Daniel P. Berrange <address@hidden> wrote:
> Some default emacs setups indent by 2 spaces and uses tabs
> which is counter to the QEMU coding style rules. Adding a
> .dir-locals.el file in the top level of the GIT repo will
> inform emacs about the QEMU coding style, and so assist
> contributors in avoiding common style mistakes before
> they submit patches.
>
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>  .dir-locals.el | 2 ++
>  1 file changed, 2 insertions(+)
>  create mode 100644 .dir-locals.el
>
> diff --git a/.dir-locals.el b/.dir-locals.el
> new file mode 100644
> index 0000000..3ac0cfc
> --- /dev/null
> +++ b/.dir-locals.el
> @@ -0,0 +1,2 @@
> +((c-mode . ((c-file-style . "stroustrup")
> +           (indent-tabs-mode . nil))))

My .emacs defines a style like this:

(defconst qemu-c-style
  '((indent-tabs-mode . nil)
    (c-basic-offset . 4)
    (tab-width . 8)
    (c-comment-only-line-offset . 0)
    (c-offsets-alist . ((statement-block-intro . +)
                        (substatement-open . 0)
                        (label . 0)
                        (statement-cont . +)
                        (innamespace . 0)
                        (inline-open . 0)
                        ))
    (c-hanging-braces-alist .
                            ((brace-list-open)
                             (brace-list-intro)
                             (brace-list-entry)
                             (brace-list-close)
                             (brace-entry-open)
                             (block-close . c-snug-do-while)
                             ;; structs have hanging braces on open
                             (class-open . (after))
                             ;; ditto if statements
                             (substatement-open . (after))
                             ;; and no auto newline at the end
                             (class-close)
                             ))
    )
  "QEMU C Programming Style")

which is a superset of Stroustrup and gets a few more
corner cases right, I think.

-- PMM