bizarre emacs indentation problem

bizarre emacs indentation problem

[luca.pamparana]

Hello,

I have a bizarre emacs indentation problem in the C++ mode. My C++
settings look as follows:

(defun my-c++-mode-hook ()
  (c-set-offset 'substatement-open 0)
  (setq indent-tabs-mode nil)
  (setq tab-width 4)
  (define-key c++-mode-map "\C-m" 'reindent-then-newline-and-indent)
  (define-key c++-mode-map "\C-ce" 'c-comment-edit)
  (setq c++-auto-hungry-initial-state 'none)
  (setq c++-delete-function 'backward-delete-char)
  (setq c++-tab-always-indent nil)
  (setq tab-stop-list '(4 8 12 16))
  (setq c-basic-offset 4)
  (setq c-indent-level 4)
  (setq c-continued-statement-offset 4)
  (setq c++-empty-arglist-indent 4))


;; Add all of the hooks...
(add-hook 'c++-mode-hook 'my-c++-mode-hook)
(add-hook 'c++-mode-hook 'turn-on-auto-fill)
(setq default-major-mode 'c++-mode)
(setq column-number-mode t)

As you can see, I have set the substatement open parameter to 0, so it
should not indent after the statement braces. However, it always
indents by 1. So, my sample if clause looks as follows:

if(something)
 {
 }

As you can see, the braces are indented by 1 space. This is driving me
crazy!

Does anyone have any idea why I might be getting this?

Many thanks,

Luca

Re: bizarre emacs indentation problem

[Alan Mackenzie]

Hi, Luca!

On Fri, Apr 10, 2009 at 04:48:30PM -0700, luca.pamparana@gmail.com wrote:
> Hello,

> I have a bizarre emacs indentation problem in the C++ mode. My C++
> settings look as follows:

> (defun my-c++-mode-hook ()
>   (c-set-offset 'substatement-open 0)
>   (setq indent-tabs-mode nil)
>   (setq tab-width 4)
>   (define-key c++-mode-map "\C-m" 'reindent-then-newline-and-indent)
>   (define-key c++-mode-map "\C-ce" 'c-comment-edit)
>   (setq c++-auto-hungry-initial-state 'none)
>   (setq c++-delete-function 'backward-delete-char)
>   (setq c++-tab-always-indent nil)
>   (setq tab-stop-list '(4 8 12 16))
>   (setq c-basic-offset 4)
>   (setq c-indent-level 4)
>   (setq c-continued-statement-offset 4)
>   (setq c++-empty-arglist-indent 4))


> ;; Add all of the hooks...
> (add-hook 'c++-mode-hook 'my-c++-mode-hook)
> (add-hook 'c++-mode-hook 'turn-on-auto-fill)
> (setq default-major-mode 'c++-mode)
> (setq column-number-mode t)

> As you can see, I have set the substatement open parameter to 0, so it
> should not indent after the statement braces. However, it always
> indents by 1. So, my sample if clause looks as follows:

> if(something)
>  {
>  }

> As you can see, the braces are indented by 1 space. This is driving me
> crazy!

> Does anyone have any idea why I might be getting this?

Yes, indeed.  In a nutshell, "gnu" style imposes a minimum indentation of
1 from column zero.

In more detail, it's in the CC Mode manual, as follows:
(i) Your CC Mode "style" is "gnu" (the default, since you haven't changed
  it).  Styles are explained on the pages "Config Basics" and "Styles".
(ii) "gnu" style imposes a minimum indentation of 1 character FROM COLUMN
  ZERO.  This is to help source code utilities which search for things in
  column zero.  This "1 character" is in user option
  `c-label-minimum-indentation' which is on page "Other Indentation".

You can fix this either by setting the default style to something other
than "gnu" (user option `c-default-style' on manual page "Choosing a
Style"), or by setting `c-label-minimum-indentation' to zero.

As a matter of interest, why are you typing an if-statement in column
zero?  :-)

> Many thanks,

> Luca

-- 
Alan Mackenzie (Nuremberg, Germany).