bug#64533: [PATCH] Support displaying function name in the header line

[Spencer Baugh]

Tags: patch


In some languages, the function name as displayed in the mode-line by
which-func-mode can be quite long.  It's useful to be able to display
it in the header-line instead.  Let's support that.

This was my original motivation for Bug#63825, so that the header line
was not displayed when which-func-mode wasn't enabled, but just teaching
which-function-mode to handle this is much easier.

* lisp/progmodes/which-func.el (which-func-use-header-line)
(which-func-use-mode-line): Add.
(which-func-try-to-enable): Support which-func-use-header-line.
(which-func--disable): Add, to support which-func-use-header-line.
(which-func-ff-hook, which-func-update-1): Use which-func--disable.

In GNU Emacs 29.0.92 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.15.12, Xaw scroll bars) of 2023-07-05 built on
 igm-qws-u22796a
Repository revision: 4127aa427fc7e2cb5b3dbae9264c2ee628474db4
Repository branch: emacs-29
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: CentOS Linux 7 (Core)

Configured using:
 'configure --config-cache --with-x-toolkit=lucid
 --with-gif=ifavailable'

0001-Support-displaying-function-name-in-the-header-line.patch
Description: Text Data