Modify indention for C/C++

Modify indention for C/C++

[Florian Lindner]

Hello,

what is the canonical way to modify indention for certain keywords? I've 
found numerous ways in the internets. I want to change the linux style 
so, that is does not do indention for namespaces.

(c-add-style "linux"
	     '(
	       (c-basic-offset . 2)
	       (c-offset-alist . (
				  (namespace-open . 0)
				  (namespace-close . 0)
				  (innamespace . 0)
				  ))
	       ))

(setq c-default-style "linux")

I tried that, and it seems to correctly c-style-alist but has no effect. 
How can I change/modify an indention style?

Thanks,
Florian

Re: Modify indention for C/C++

[Florian Lindner]

Am 11.06.2014 15:24, schrieb Florian Lindner:
> Hello,
> 
> what is the canonical way to modify indention for certain keywords?
> I've found numerous ways in the internets. I want to change the linux
> style so, that is does not do indention for namespaces.

> I tried that, and it seems to correctly c-style-alist but has no
> effect. How can I change/modify an indention style?
> 
> Thanks,
> Florian

Documentation to c-style-alist says:

Do not change this variable directly.  Use the function `c-add-style'
to add new styles or modify existing styles (it is not a good idea to
modify existing styles -- you should create a new style that inherits
the existing style).

But in the doc of c-add-style it does not mention how to inherit from a 
style.

Another question:  (statement-case-open . +) Why is there a dot . in the 
middle of the clause?

Re: Modify indention for C/C++

[Kevin Rodgers]

On 6/11/14 7:31 AM, Florian Lindner wrote:
> Another question: (statement-case-open . +) Why is there a dot . in the middle
> of the clause?

M-: (info "(elisp)Cons Cells") ; C-s dotted

M-: (info "(elisp)Dotted Pair Notation")

Hope that helps,
-- 
Kevin Rodgers
Denver, Colorado, USA

Re: Modify indention for C/C++

[Teemu Likonen]

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Florian Lindner [2014-06-11 15:24:34 +02:00] wrote:

> what is the canonical way to modify indention for certain keywords?
> I've found numerous ways in the internets. I want to change the linux
> style so, that is does not do indention for namespaces.
>
> (c-add-style "linux"
> 	     '(
> 	       (c-basic-offset . 2)
> 	       (c-offset-alist . (
> 				  (namespace-open . 0)
> 				  (namespace-close . 0)
> 				  (innamespace . 0)
> 				  ))
> 	       ))

How about this?

    (c-add-style "my-linux"
                 '("linux"
                   (c-basic-offset . 2)
                   (c-offset-alist (namespace-open . 0)
                                   (namespace-close . 0)
                                   (innamespace . 0))))

This adds "my-linux" style, so the original is not overwritten.

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Re: Modify indention for C/C++

[Florian Lindner]

Am 11.06.2014 15:42, schrieb Teemu Likonen:
> Florian Lindner [2014-06-11 15:24:34 +02:00] wrote:
> 
>> what is the canonical way to modify indention for certain keywords?
>> I've found numerous ways in the internets. I want to change the linux
>> style so, that is does not do indention for namespaces.
>> 
>> (c-add-style "linux"
>> 	     '(
>> 	       (c-basic-offset . 2)
>> 	       (c-offset-alist . (
>> 				  (namespace-open . 0)
>> 				  (namespace-close . 0)
>> 				  (innamespace . 0)
>> 				  ))
>> 	       ))
> 
> How about this?
> 
>     (c-add-style "my-linux"
>                  '("linux"
>                    (c-basic-offset . 2)
>                    (c-offset-alist (namespace-open . 0)
>                                    (namespace-close . 0)
>                                    (innamespace . 0))))
> 
> This adds "my-linux" style, so the original is not overwritten.

c-style-alist now has an entry:

  ("my-linux" "linux"
   (c-basic-offset . 2)
   (c-offset-alist
    (namespace-open . 0)
    (namespace-close . 0)
    (innamespace . 0)))

Does that mean the mode is derived from linux?

Indention is still the same, after a namespace code is being indented. 
I've activated the my-linux style.

Thx,
Florian

Re: Modify indention for C/C++

[Emanuel Berg]

Florian Lindner <mailinglists@xgm.de> writes:

> what is the canonical way to modify indention for
> certain keywords? I've found numerous ways in the
> internets. I want to change the linux style so, that
> is does not do indention for namespaces.

I wrote a major mode [1] some times back (with a little
help from my friends, as always) and I remember I
wanted to have indentation just like in C because the
syntax was sort of, but not quite, as C.

So I wrote the following defun - perhaps it can be of
value to you:

(defun fpscalc-indent-line ()
  "Indentation function."
  (interactive)
  (beginning-of-line)
  (if (bobp) (indent-line-to 0)
    (let ((not-indented t)
          (cur-indent   0)
          (indent-unit  2))
      (if (looking-at "^[ \t]*}")
          (progn
            (save-excursion
              (forward-line -1)
              (setq cur-indent (- (current-indentation) indent-unit) ))
            (if (< cur-indent 0) (setq cur-indent 0)) )
        (save-excursion
          (while not-indented
            (forward-line -1)
            (if (looking-at "^[ \t]*}")
                (progn
                  (setq cur-indent (current-indentation))
                  (setq not-indented nil) )
              (if (looking-at "^[ \t]*\\(system\\|declarations\\|semaphores\\|initialise\\|formulas\\)")
                  (progn
                    (setq cur-indent (+ (current-indentation) indent-unit))
                    (setq not-indented nil) )
                (if (bobp) (setq not-indented nil) ))))))
      (indent-line-to cur-indent) )))

Then somewhere:

(setq indent-line-function 'fpscalc-indent-line)

[1] project:  http://user.it.uu.se/~embe8573/fps/
    code:     http://user.it.uu.se/~embe8573/fps/fpscalc.el

-- 
underground experts united:
http://user.it.uu.se/~embe8573