[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped da
From: |
Stephen J. Turnbull |
Subject: |
Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped data |
Date: |
Tue, 13 Aug 2013 13:24:47 +0900 |
Juanma Barranquero writes:
> In other words, portable elisp code should really do
>
> (and (fboundp 'zlib-available-p) (zlib-available-p))
>
> to check for zlib support. Perhaps it would be worth to encapsulate
> that check into (yet another) predicate...
XEmacs has an if-fboundp macro which does the above, but it's ugly.
I prefer extending the #'featurep mechanism to optionally do such
checks. Eg,
;;; There's Fprovide(symbol) and Fput(Fintern("symbol"),
;;; Fintern("availability-predicate"),
;;; availability_predicate_DEFUN_symbol))
;;; conditionally compiled on --with-symbol in the startup code.
(defun feature-available-p (symbol)
(and (featurep symbol)
;; I'm a ba-a-ad boy.
(funcall (get symbol 'availability-predicate (lambda ())))))
Contributed to XEmacs under my agreement with the FSF. Ie, now
copyright 2013 FSF. There may be better ways of spelling all this, of
course.
- Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped data, Stefan Monnier, 2013/08/12
- Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped data, Stefan Monnier, 2013/08/13
- Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped data, Eli Zaretskii, 2013/08/13
- Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped data, Lars Magne Ingebrigtsen, 2013/08/13
- Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped data, Stefan Monnier, 2013/08/13
- Re: [Emacs-diffs] trunk r113822: Add a test for decompressing gzipped data, Eli Zaretskii, 2013/08/13