* defvar and "special-variable-p"-ness
@ 2021-08-14 23:02 Eduardo Ochs
2021-08-14 23:24 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-08-14 23:37 ` Stefan Monnier via Users list for the GNU Emacs text editor
0 siblings, 2 replies; 6+ messages in thread
From: Eduardo Ochs @ 2021-08-14 23:02 UTC (permalink / raw)
To: help-gnu-emacs
Hi list,
after "defvar"-ing a variable its "special-variable-p"-ness becomes
true. Is there a way to make its "special-variable-p"-ness nil again?
That would be useful for some tests that I am trying to write...
By the way, I thought that "unload-feature" would be able to revert
the "special-variable-p"-ness of a variable back to nil, but it seems
that it doesn't do that. Here's how I tested it. I created a file
"/tmp/myfile.el" with just these three lines,
;; Copy this 3-line block to /tmp/myfile.el
(defvar myvar 99)
(provide 'myfile)
Then I ran the uncommented sexps below one by one with my favorite
variant of `C-x C-e':
(setq myvar 42)
(special-variable-p 'myvar)
;; ^ --> nil
(require 'myfile "/tmp/myfile.el")
(assoc "/tmp/myfile.el" load-history)
;; ^ --> ("/tmp/myfile.el" myvar (provide . myfile))
(special-variable-p 'myvar)
;; ^ --> t
(unload-feature 'myfile)
(assoc "/tmp/myfile.el" load-history)
;; ^ --> nil
(special-variable-p 'myvar)
;; ^ --> t
Thanks in advance!
Eduardo Ochs
http://angg.twu.net/#eev
http://angg.twu.net/eev-intros/find-lexical-intro.html
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: defvar and "special-variable-p"-ness 2021-08-14 23:02 defvar and "special-variable-p"-ness Eduardo Ochs @ 2021-08-14 23:24 ` Emanuel Berg via Users list for the GNU Emacs text editor 2021-08-14 23:29 ` Eduardo Ochs 2021-08-14 23:37 ` Stefan Monnier via Users list for the GNU Emacs text editor 1 sibling, 1 reply; 6+ messages in thread From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-08-14 23:24 UTC (permalink / raw) To: help-gnu-emacs Eduardo Ochs wrote: > after "defvar"-ing a variable its "special-variable-p"-ness becomes > true It does? -- underground experts united https://dataswamp.org/~incal ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: defvar and "special-variable-p"-ness 2021-08-14 23:24 ` Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-08-14 23:29 ` Eduardo Ochs 2021-08-15 0:58 ` Emanuel Berg via Users list for the GNU Emacs text editor 0 siblings, 1 reply; 6+ messages in thread From: Eduardo Ochs @ 2021-08-14 23:29 UTC (permalink / raw) To: Emanuel Berg, help-gnu-emacs On Sat, 14 Aug 2021 at 20:25, Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote: > > Eduardo Ochs wrote: > > > after "defvar"-ing a variable its "special-variable-p"-ness becomes > > true > > It does? Hi Emanuel, please try the tests in my e-mail - this one: https://lists.gnu.org/archive/html/help-gnu-emacs/2021-08/index.html Cheers, E. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: defvar and "special-variable-p"-ness 2021-08-14 23:29 ` Eduardo Ochs @ 2021-08-15 0:58 ` Emanuel Berg via Users list for the GNU Emacs text editor 0 siblings, 0 replies; 6+ messages in thread From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-08-15 0:58 UTC (permalink / raw) To: help-gnu-emacs Eduardo Ochs wrote: >>> after "defvar"-ing a variable its >>> "special-variable-p"-ness becomes true >> >> It does? > > please try the tests in my e-mail - this one: > https://lists.gnu.org/archive/html/help-gnu-emacs/2021-08/index.html Please read this webpage first... (defvar not-special) (setq not-special "not special") (special-variable-p 'not-special) ; nil (defvar special "soo special") (special-variable-p 'special) ; t -- underground experts united https://dataswamp.org/~incal ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: defvar and "special-variable-p"-ness 2021-08-14 23:02 defvar and "special-variable-p"-ness Eduardo Ochs 2021-08-14 23:24 ` Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-08-14 23:37 ` Stefan Monnier via Users list for the GNU Emacs text editor 2021-08-15 0:24 ` Eduardo Ochs 1 sibling, 1 reply; 6+ messages in thread From: Stefan Monnier via Users list for the GNU Emacs text editor @ 2021-08-14 23:37 UTC (permalink / raw) To: help-gnu-emacs > after "defvar"-ing a variable its "special-variable-p"-ness becomes > true. Is there a way to make its "special-variable-p"-ness nil again? > That would be useful for some tests that I am trying to write... There's `internal-make-var-non-special`. Stefan ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: defvar and "special-variable-p"-ness 2021-08-14 23:37 ` Stefan Monnier via Users list for the GNU Emacs text editor @ 2021-08-15 0:24 ` Eduardo Ochs 0 siblings, 0 replies; 6+ messages in thread From: Eduardo Ochs @ 2021-08-15 0:24 UTC (permalink / raw) To: Stefan Monnier; +Cc: help-gnu-emacs On Sat, 14 Aug 2021 at 20:38, Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote: > > > after "defvar"-ing a variable its "special-variable-p"-ness becomes > > true. Is there a way to make its "special-variable-p"-ness nil again? > > That would be useful for some tests that I am trying to write... > > There's `internal-make-var-non-special`. Perfect! Thanks! =) =) =) E. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-08-15 0:58 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2021-08-14 23:02 defvar and "special-variable-p"-ness Eduardo Ochs 2021-08-14 23:24 ` Emanuel Berg via Users list for the GNU Emacs text editor 2021-08-14 23:29 ` Eduardo Ochs 2021-08-15 0:58 ` Emanuel Berg via Users list for the GNU Emacs text editor 2021-08-14 23:37 ` Stefan Monnier via Users list for the GNU Emacs text editor 2021-08-15 0:24 ` Eduardo Ochs
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