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* I'd like to marry while and mapcar...
@ 2015-02-06 12:56 Marcin Borkowski
  2015-02-06 13:18 ` Rasmus
                   ` (6 more replies)
  0 siblings, 7 replies; 16+ messages in thread
From: Marcin Borkowski @ 2015-02-06 12:56 UTC (permalink / raw)
  To: Help Gnu Emacs mailing list

Hello Emacsers and Elispers!

What I'd need is kind of a marriage of while and mapcar: I'd like to run
some function until it returns nil and make a list of all results it
gives back until then.

Mu use case is that I'm getting some info from a LaTeX file.  For
instance, assume that I want to make a list of all files \include'd by
a LaTeX document.  I've written a function `get-TeX-macro-arguments'
which finds the next occurence of a given TeX command, moves point past
it and returns its arguments; if it does not find any such occurrence,
it returns nil.  So I can say something like this:

(let (current-include (list-of-includes ()))
  (while (setq current-include (get-TeX-macro-arguments "include"))
    (setq list-of-includes (append list-of-includes current-include)))
  list-of-includes)

This, however, looks a bit, let's say, Fortran-ish;-); I'm after a more
Lispy way.  (Of course, one step would be to use anaphoric while, but
that doesn't help my main problem of ditching list-of-includes.)

Yes, I know, I have too much time on my hands, and I bother about style.
But I'm also curious whether there is any "standard" way, or whether
I should indeed wrap something like the above code in a macro, or
something.  (Or maybe just don't care...)

TIA,

-- 
Marcin Borkowski               This email was proudly sent
http://mbork.pl                from my Emacs.



^ permalink raw reply	[flat|nested] 16+ messages in thread
[parent not found: <mailman.19392.1423227427.1147.help-gnu-emacs@gnu.org>]

end of thread, other threads:[~2015-02-08  0:28 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-02-06 12:56 I'd like to marry while and mapcar Marcin Borkowski
2015-02-06 13:18 ` Rasmus
2015-02-06 13:53   ` Marcin Borkowski
2015-02-06 14:14     ` Rasmus
2015-02-06 13:36 ` Eli Zaretskii
2015-02-06 13:50   ` Marcin Borkowski
2015-02-06 13:44 ` Doug Lewan
     [not found] ` <mailman.19396.1423229779.1147.help-gnu-emacs@gnu.org>
2015-02-06 16:25   ` Barry Margolin
2015-02-06 16:52     ` Pascal J. Bourguignon
2015-02-06 22:49 ` Drew Adams
2015-02-07 21:09   ` Robert Thorpe
2015-02-07 23:37 ` Thien-Thi Nguyen
     [not found] ` <mailman.19494.1423352465.1147.help-gnu-emacs@gnu.org>
2015-02-08  0:28   ` Emanuel Berg
     [not found] <mailman.19392.1423227427.1147.help-gnu-emacs@gnu.org>
2015-02-06 14:13 ` Pascal J. Bourguignon
2015-02-06 14:54 ` Joost Kremers
2015-02-06 17:47   ` Joost Kremers

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