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From: Fren Zeee on 4 Aug 2010 00:45
On Aug 2, 5:31 pm, "Daniel (Youngwhan)" <breadn...(a)gmail.com> wrote:
> Hi,
>
> If there is curly brace, it is easy to navigate between them by M-C-f
> and M-C-b in c-mode.
>
> However, I cannot find a way to navigate in like curly brace when it
> comes to #ifdef, #else, and #endif.
>
> For example, if there is a code like this:
>
> #ifdef A_DEFINED
> (...100 lines)
> #else
> (... 500 lines)
> #endif
>
> , is there a easy way to move the cursor from #endif to #ifdef or
> #else and vice versa?
>
> Daniel

You might get better luck posting in a C group also.

I use #ifdef ... #endif often also to comment out blocks of code
during debugging.

My question to CLISP/ELISP/scheme people is

If there is a wrapper do nothing type function in elisp/clisp/scheme
which can have the same effect as commenting out.

This is because I dont like to do comment-region/uncomment-region in
emacs.

These three lispy languages dont seem to have comment block construct
like C ie /* and */
From: Elena on 4 Aug 2010 12:20
On Aug 4, 4:45 am, Fren Zeee <frenz...(a)gmail.com> wrote:
> If there is a wrapper do nothing type function in elisp/clisp/scheme
> which can have the same effect as commenting out.

In Emacs Lisp, if you are looking for a way to comment out blocks of
text, you are out of luck. I've read Pythonistas use multi-line
strings as multi-line comments (strings are always multi-line in
Emacs).

If you are looking for a way to comment out blocks of code, you can do
that with a macro. I remember having seen a "comment" macro inside
Emacs Lisp packages kindly published by Pascal J. Bourguignon here:
http://www.informatimago.com/develop/emacs/index.html
From: Elena on 4 Aug 2010 12:23
On Aug 4, 4:45 am, Fren Zeee <frenz...(a)gmail.com> wrote:
> If there is a wrapper do nothing type function in elisp/clisp/scheme
> which can have the same effect as commenting out.

Scheme multi-line comments are here:

http://srfi.schemers.org/srfi-30/srfi-30.html

Which also is first hit when searching the Net for "scheme multi line
comments".
From: Emmy Noether on 5 Aug 2010 14:00
On Aug 3, 9:45 pm, Fren Zeee <frenz...(a)gmail.com> wrote:
> On Aug 2, 5:31 pm, "Daniel (Youngwhan)" <breadn...(a)gmail.com> wrote:
>
>
>
> > Hi,
>
> > If there is curly brace, it is easy to navigate between them by M-C-f
> > and M-C-b in c-mode.
>
> > However, I cannot find a way to navigate in like curly brace when it
> > comes to #ifdef, #else, and #endif.
>
> > For example, if there is a code like this:
>
> > #ifdef A_DEFINED
> > (...100 lines)
> > #else
> > (... 500 lines)
> > #endif
>
> > , is there a easy way to move the cursor from #endif to #ifdef or
> > #else and vice versa?
>
> > Daniel
>
> You might get better luck posting in a C group also.
>
> I use #ifdef ... #endif often also to comment out blocks of code
> during debugging.
>
> My question to CLISP/ELISP/scheme people is
>
> If there is a wrapper do nothing type function in elisp/clisp/scheme
> which can have the same effect as commenting out.
>
> This is because I dont like to do comment-region/uncomment-region in
> emacs.
>
> These three lispy languages dont seem to have comment block construct
> like C ie /* and */

I would remove a function block by wrapping in one of man conditionals
like

(cond (f (comment-out-block)) )

the short circuit evaluation would not even process it.

I plan to test this idea in the future.
From: Aaron W. Hsu on 6 Aug 2010 00:59
Fren Zeee <frenzeee(a)gmail.com> writes:

>My question to CLISP/ELISP/scheme people is

>If there is a wrapper do nothing type function in elisp/clisp/scheme
>which can have the same effect as commenting out.

>This is because I dont like to do comment-region/uncomment-region in
>emacs.

>These three lispy languages dont seem to have comment block construct
>like C ie /* and */

Actually, there are a lot of them in common use. Here are the one's I
use regularly, and you can check with your implementation to see if it
provides them:

#| |# block comments
#; Expression comments

I find the expression comments to be very useful. Basically, it let's
you comment out the next expression, such as this:

(if (test)
#;(bad
nothing
or another)
(good thing)
(other thing))

Now, some people don't like it because it plays with their Emacs
commenting modes. Since I don't use Emacs, this doesn't bother me. ;-)
On the other hand, the workaround if you don't want to hack your Scheme
highlighting is to do something like this instead:

(if (test)
#;
(bad
nothing
or another)
(good thing)
(other thing))

This will keep the highlighting mostly in check and still do the same
thing.

Aaron W. Hsu
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