From: David Maus <dmaus@ictsoc.de>
To: Bastien <bzg@altern.org>
Cc: emacs-orgmode@gnu.org
Subject: Re: New feature: loop over siblings for some commands
Date: Tue, 19 Jul 2011 20:27:26 +0200 [thread overview]
Message-ID: <87zkkayvld.wl%dmaus@ictsoc.de> (raw)
In-Reply-To: <87aacchtv8.fsf@gnu.org>
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At Mon, 18 Jul 2011 10:32:11 +0200,
Bastien wrote:
>
> Dear all,
>
> from latest git repo:
>
> (setq org-loop-over-siblings-within-active-region-p t)
>
> will allow you to run some commands on several siblings in
> the active region.
>
> For example:
>
> <start active region>
> * Item 1
> * Item 2
> * Item 3
> <end active region>
>
> Then `C-c C-s' (org-schedule) will ask for a schedule date
> for each of the item in the active region. See the commit
> log for more details:
>
> http://orgmode.org/w/?p=org-mode.git;a=commit;h=366254217ac6faea20a5d43fae065bd028806eab
>
> I'm interested in allowing this for org-todo as well, but I
> would first like some feedback on the current feature and its
> scope wrt actual needs.
The macro suffers from leaking: It let-binds symbols like beg, end
etc. that might be present in ,@body. The let-bound symbols will
shadow body's.
Minimal example:
,----
| (defmacro leak-it-baby (&rest body)
| `(let ((foobar 0))
| (while (< foobar 10)
| (setq foobar (1+ foobar))
| ,@body)))
|
| (let ((foobar 9))
| (leak-it-baby
| (setq foobar 11)
| (print foobar)))
|
| ELISP> (macroexpand '(leak-it-baby (setq foobar 11)))
| (let
| ((foobar 0))
| (while
| (< foobar 10)
| (setq foobar
| (1+ foobar))
| (setq foobar 11)))
|
| ELISP>
`----
The whole problem of leaking macros is discussed in Peter Seibel's
"Practical Common Lisp", Chapter 8
http://www.gigamonkeys.com/book/macros-defining-your-own.html
The solution is a heavy use of C-h f gensym RET for all symboles
needed in the macro to create fresh, unique und uninterned symbols.
If no one jumps on a fix for this I will provide one till next
sunday. Always wanted to do some lecker macro programming :)
Best,
-- David
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next prev parent reply other threads:[~2011-07-19 18:27 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-18 8:32 New feature: loop over siblings for some commands Bastien
2011-07-19 18:27 ` David Maus [this message]
2011-07-20 19:46 ` David Maus
2011-07-27 15:28 ` Bastien
2011-07-27 18:47 ` David Maus
2011-07-28 8:54 ` Bastien
2011-08-10 8:34 ` David Maus
2011-08-12 7:58 ` David Maus
2011-08-16 16:36 ` Bastien
2011-08-25 4:25 ` [PATCH 0/5] loop over headlines in active region David Maus
2011-08-25 6:13 ` Carsten Dominik
2011-08-28 13:58 ` David Maus
2011-08-29 9:29 ` Carsten Dominik
2011-08-30 4:36 ` David Maus
2011-08-25 10:08 ` Štěpán Němec
2011-08-28 13:57 ` David Maus
2011-09-07 19:34 ` Štěpán Němec
2011-09-09 4:06 ` David Maus
2011-09-09 10:26 ` Štěpán Němec
2011-09-09 10:41 ` Bastien
2011-09-09 10:46 ` Štěpán Němec
2011-09-09 15:10 ` David Maus
2011-09-09 15:26 ` Štěpán Němec
2011-09-09 15:52 ` David Maus
2011-10-06 8:35 ` Carsten Dominik
2011-10-08 18:59 ` David Maus
2011-10-08 20:11 ` Carsten Dominik
2011-10-08 20:55 ` David Maus
2011-08-25 4:25 ` [PATCH 1/5] Extend scope 'region to include body of last headline " David Maus
2011-08-25 5:40 ` Carsten Dominik
2011-08-30 4:33 ` David Maus
2011-08-25 4:25 ` [PATCH 2/5] Immediately return if scope is region but no region is active David Maus
2011-08-25 5:43 ` Carsten Dominik
2011-08-28 14:00 ` David Maus
2011-08-29 9:31 ` Carsten Dominik
2011-08-30 4:40 ` David Maus
2011-08-25 4:25 ` [PATCH 3/5] New customization variable: Loop over headlines in active region David Maus
2011-08-25 4:25 ` [PATCH 4/5] Skip invisible headlines when mapping " David Maus
2011-08-25 4:25 ` [PATCH 5/5] Avoid conflict between bulk command and loop-over-headlines David Maus
2011-10-22 14:23 ` Bastien
2011-07-27 15:23 ` New feature: loop over siblings for some commands Bastien
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