From: uzibalqa <uzibalqa@proton.me>
To: Stephen Berman <stephen.berman@gmx.net>
Cc: uzibalqa via Users list for the GNU Emacs text editor
<help-gnu-emacs@gnu.org>
Subject: Re: Using button-label in pcase
Date: Mon, 24 Jul 2023 21:35:44 +0000 [thread overview]
Message-ID: <ssEmnvjnYjDAL-5Fx8lS_1W4VGAlK_AF5wF3sM_KbwkrGflMmhFlG-did9KFNtqdHlruH9ezr8KBtOTexqAJBNCW_kE5R5xEn0qxS4CZF3U=@proton.me> (raw)
In-Reply-To: <87pm4hvztc.fsf@gmx.net>
------- Original Message -------
On Tuesday, July 25th, 2023 at 8:07 AM, Stephen Berman <stephen.berman@gmx.net> wrote:
> On Mon, 24 Jul 2023 19:14:27 +0000 uzibalqa uzibalqa@proton.me wrote:
>
> > Want to print some text as a result of clicking a button. With the code below
> > I end up with
> >
> > (wrong-type-argument integer-or-marker-p nil)
> > buffer-substring-no-properties(nil nil)
> > button-label(#<overlay in no buffer>)
> > (let* ((val (button-label button))) (if (equal val '"[FA]") (let nil (insert qrh-c))))
> > (closure ((button . #<overlay in no buffer>)) nil (let* ((val (button-label button))) (if (equal val '"[FA]") (let nil (insert qrh-c)))))()
> > help--window-setup("Help" (closure ((button . #<overlay in no buffer>)) nil (let* ((val (button-label button))) (if (equal val '"[FA]") (let nil (insert qrh-c))))))
> > qrh-b(#<overlay in no buffer>)
> > button-activate(#<overlay in no buffer> t)
> > push-button(3 t)
> >
> > What is going on. Is there a fix?
> >
> > (defconst qrh-c "[FA] Some Text")
> >
> > (defun qrh-b (button)
> > "Prints information about how to install emacs."
> > (with-help-window (help-buffer)
> > (pcase (button-label button)
> > ("[FA]" (insert qrh-c))) ))
> >
> > (defun qrh-a ()
> > "Prints information about how to install emacs."
> > (interactive)
> > (with-help-window (help-buffer)
> > (insert-button "[FC]"
> > 'action 'qrh-b 'follow-link t) ))
>
> The error is raised because qrh-b calls with-help-window with the Help
> buffer current, but with-help-window erases the buffer, so when
> `(button-label button)' is evaluated, there is no button and this
> signals the error.
That what was wrong then.
> If you want to use the existing Help buffer, just remove the call to
> with-help-window in qrh-b.
> However, Help buffers are read-only, so
> trying to insert text will raise another error. To avoid this, you can
> let-bind buffer-read-only in qrh-b.
I do not experience the problem you mention. What error are you referring to,
and how can it be triggered ?
> However, since qrh-a inserts "[FC]"
> but qrh-b tries to match "[FA]", the match will fail, so the insertion
> in qrh-b will not happen. - Steve Berman
That was an error from my part.
next prev parent reply other threads:[~2023-07-24 21:35 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-24 19:14 Using button-label in pcase uzibalqa
2023-07-24 20:07 ` Stephen Berman
2023-07-24 21:35 ` uzibalqa [this message]
2023-07-24 21:51 ` Stephen Berman
2023-07-24 22:24 ` uzibalqa
2023-07-24 22:36 ` Stephen Berman
2023-07-24 22:40 ` uzibalqa
2023-07-24 22:53 ` Stephen Berman
2023-07-24 23:40 ` uzibalqa
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