From: Spencer Baugh <sbaugh@janestreet.com>
To: Eshel Yaron <me@eshelyaron.com>
Cc: Eli Zaretskii <eliz@gnu.org>, 63825@debbugs.gnu.org
Subject: bug#63825: 29.0.90; The header line should be hidden when empty
Date: Thu, 01 Jun 2023 13:37:18 -0400 [thread overview]
Message-ID: <ier1qiv13u9.fsf@janestreet.com> (raw)
In-Reply-To: <m15y87jfm4.fsf@eshelyaron.com> (Eshel Yaron's message of "Thu, 01 Jun 2023 19:45:39 +0300")
Eshel Yaron <me@eshelyaron.com> writes:
> Eli Zaretskii <eliz@gnu.org> writes:
>> header-line-format supports :eval and :when, so why cannot
>> which-function-mode use those to yield nil when there's nothing to
>> show?
>
> I thought so as well, but it seems that the header line is displayed
> even when the value of `header-line-format` yields nil, if it isn't
> plain nil.
>
> So this shows an empty header line:
>
> (setq-default header-line-format '(:eval nil))
>
> (In Emacs master with -Q.)
Yes, this is what I meant. Sorry, my example was not chosen carefully.
I should have chosen an example which yielded an actually empty string
when processed by format-mode-line, such as '(:eval nil);
(format-mode-line '(:eval nil)) evaluates to "", which I think should
cause the header-line to not appear.
next prev parent reply other threads:[~2023-06-01 17:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-01 13:37 bug#63825: 29.0.90; The header line should be hidden when empty Spencer Baugh
2023-06-01 16:14 ` Eli Zaretskii
2023-06-01 16:45 ` Eshel Yaron via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-06-01 17:37 ` Spencer Baugh [this message]
2023-06-01 18:46 ` Eli Zaretskii
2023-06-01 20:22 ` Spencer Baugh
2023-06-02 6:19 ` Eshel Yaron via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-06-02 11:36 ` Eli Zaretskii
2023-06-02 18:53 ` Eshel Yaron via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-06-03 5:44 ` Eli Zaretskii
2023-06-03 7:28 ` Eshel Yaron via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-06-04 7:03 ` Eli Zaretskii
2023-06-04 16:45 ` Eshel Yaron via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-06-06 12:18 ` Eli Zaretskii
2023-06-06 12:28 ` Eshel Yaron via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-06-02 6:23 ` Eli Zaretskii
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