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* [Suggestion] New function `emacs-version>='
@ 2003-05-02 19:55 Wedler, Christoph
  2003-05-02 21:00 ` Juanma Barranquero
                   ` (3 more replies)
  0 siblings, 4 replies; 21+ messages in thread
From: Wedler, Christoph @ 2003-05-02 19:55 UTC (permalink / raw)


I would like to see the following function defined in Emacs[1]:

(defun emacs-version>= (major &optional minor patch)
  "Return true if the Emacs version is >= to the given version.
The version is provided by the required argument MAJOR, and the optional
arguments MINOR and PATCH.  Only the non-nil arguments are used in the
test."
  (cond ((> emacs-major-version major))
	((< emacs-major-version major) nil)
	((null minor))
	((> emacs-minor-version minor))
	((< emacs-minor-version minor) nil)
	((null patch))
	((string-match "^[0-9]+\\.[0-9]+\\.\\([0-9]+\\)" emacs-version)
	 (>= (string-to-int (match-string 1 emacs-version)) patch)))))

(Of course, a constant `emacs-patch-version' could be defined, as well.
The function above would be changed to use it.)

Specific features or bug fixes are only available in newer Emacsen and
packages must be able to cope with it.

A test like `fboundp' is only the right test iff the new feature to test
for availibility is a function, it is not the right test for

 - I need to check the availibility for feature/fix A
 - feature/fix A is provided with Emacs-X.Y
 - function F is new with Emacs-X.Y
 - therefore I test with (fboundp 'F)

The right test is

 - I need to check the availibility for feature/fix A
 - feature/fix A is provided with Emacs-X.Y
 - therefore I test with (emacs-version>= X Y)

Like it or not, a test like `emacs-version>=' would be useful for many
packages, thus a corresponding function would be useful to define in
Emacs.

- Christoph

[1] This function is already defined in XEmacs.

^ permalink raw reply	[flat|nested] 21+ messages in thread

end of thread, other threads:[~2003-05-06 23:42 UTC | newest]

Thread overview: 21+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2003-05-02 19:55 [Suggestion] New function `emacs-version>=' Wedler, Christoph
2003-05-02 21:00 ` Juanma Barranquero
2003-05-02 21:14   ` Stefan Monnier
2003-05-02 21:35     ` Juanma Barranquero
2003-05-03 11:12       ` Ehud Karni
2003-05-03 13:54         ` Juanma Barranquero
2003-05-03 16:08           ` Stephen J. Turnbull
2003-05-04 19:15             ` Juanma Barranquero
2003-05-06 11:05               ` Stephen J. Turnbull
2003-05-04 13:04           ` Richard Stallman
2003-05-03 17:48     ` Reiner Steib
2003-05-03 18:42       ` Stefan Monnier
2003-05-05 13:47         ` sort-coding-systems in 21.3 and RC branch (was: New function `emacs-version>=') Reiner Steib
2003-05-06  7:08           ` Kenichi Handa
2003-05-02 21:16 ` [Suggestion] New function `emacs-version>=' Thien-Thi Nguyen
2003-05-04 13:03 ` Richard Stallman
2003-05-05 12:52   ` Wedler, Christoph
2003-05-05 13:20     ` Juanma Barranquero
2003-05-05 19:11     ` Richard Stallman
2003-05-05 21:59     ` Luc Teirlinck
2003-05-06 23:42 ` Istvan Marko

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