c-mode eats page-breaks

c-mode eats page-breaks

[Alfred M. Szmidt]

Hi,

In c-mode, when you have a page-break (^L) in column 0, and you hit
TAB (c-indent-command) while having point at column 0, the page-break
gets eaten.  Is this a bug or a feature?

Happy hacking.

RE: c-mode eats page-breaks

[Herbert Euler]

>In c-mode, when you have a page-break (^L) in column 0, and you hit
>TAB (c-indent-command) while having point at column 0, the page-break
>gets eaten.  Is this a bug or a feature?

I found that ^L is a member of white space characters.  Namely,
`skip-syntax-forward' will treat it as a white space.  This does not
answer whether it is a bug, but it answers why the ^L is eaten.

Regards,
Guanpeng Xu

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Re: c-mode eats page-breaks

[Alan Mackenzie]

Hi, Alfred!

On Wed, Jan 31, 2007 at 10:51:30PM +0100, Alfred M. Szmidt wrote:
> Hi,

> In c-mode, when you have a page-break (^L) in column 0, and you hit
> TAB (c-indent-command) while having point at column 0, the page-break
> gets eaten.  Is this a bug or a feature?

:-)

On balance, I think it's a bug.

So I'm going to change this so that ^Ls remain unmolested by indentation
commands. 

> Happy hacking.

Thanks for the report!

-- 
Alan Mackenzie (Ittersbach, Germany).

Re: c-mode eats page-breaks

[David Kastrup]

Alan Mackenzie <acm@muc.de> writes:

> Hi, Alfred!
>
> On Wed, Jan 31, 2007 at 10:51:30PM +0100, Alfred M. Szmidt wrote:
>> Hi,
>
>> In c-mode, when you have a page-break (^L) in column 0, and you hit
>> TAB (c-indent-command) while having point at column 0, the page-break
>> gets eaten.  Is this a bug or a feature?
>
> :-)
>
> On balance, I think it's a bug.
>
> So I'm going to change this so that ^Ls remain unmolested by indentation
> commands. 

It probably should not have a syntax of whitespace.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

Re: c-mode eats page-breaks

[Alan Mackenzie]

Hi, Alfred.

I've just commited a fix to ..../lisp/progmodes/cc-cmds.el.  Could you
update your copy of Emacs and try it out, please.

On Wed, Jan 31, 2007 at 10:51:30PM +0100, Alfred M. Szmidt wrote:
> Hi,
 
> In c-mode, when you have a page-break (^L) in column 0, and you hit
> TAB (c-indent-command) while having point at column 0, the page-break
> gets eaten.  Is this a bug or a feature?
 
> Happy hacking.

-- 
Alan Mackenzie (Ittersbach, Germany)

Re: c-mode eats page-breaks

[Alfred M. Szmidt]

   I've just commited a fix to ..../lisp/progmodes/cc-cmds.el.  Could
   you update your copy of Emacs and try it out, please.

Thanks! It doesn't eat it, but I think that point should stay at
column 0 and not move.  That is atleast what happens in other modes
(emacs-lisp-mode for example).

Thanks for the quick response!

Re: c-mode eats page-breaks

[Richard Stallman]

Formfeed is traditionally considered whitespace.
The mistake is to delete all kinds of whitespace indiscriminately.

To be whitespace means it is syntactically equivalent to a space,
but that doesn't mean it should be deleted arbitrarily.