bug#74817: 31.0.50; mode-line-format-right-align doesn't work well on header-line

bug#74817: 31.0.50; mode-line-format-right-align doesn't work well on header-line

[Eval Exec]

for example:
I create a scratch init.el:
```elisp


(defun header0()
  "header_line_head")
(defun header1()
  "header_line_tail")

(add-to-list 'header-line-format '(:eval (header0)) t)
(add-to-list 'header-line-format mode-line-format-right-align t)
(add-to-list 'header-line-format '(:eval (header1)) t)
```

Then start emacs, I got: https://imgur.com/a/PHGxRyf

You can see, in the right side of header-line, it's wrong, not right align well.



In GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.2) of 2024-12-07 built on Mufasa
Repository revision: 6f6b641975e4828f96913b29b1476c6323c952d8
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12401004
System Description: NixOS 24.11 (Vicuna)

Configured using:
 'configure 'CFLAGS=-O3 -mtune=native -march=native'
 --prefix=/home/exec/Projects/git.savannah.gnu.org/git/emacs-build/master-commit-6f6b641975e4828f96913b29b1476c6323c952d8-O3
 --with-imagemagick --with-modules --with-cairo --with-cairo-xcb
 --without-compress-install --with-native-compilation --with-mailutils
 --enable-link-time-optimization --with-tree-sitter --with-xinput2
 --with-dbus --with-native-compilation=aot
 --with-file-notification=inotify'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG LCMS2 LIBOTF LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
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  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=fcitx
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Major mode: ELisp/d

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bug#74817: 31.0.50; mode-line-format-right-align doesn't work well on header-line

[Eli Zaretskii]

tags 74817 notabug wontfix
thanks

> From: Eval Exec <execvy@gmail.com>
> Date: Thu, 12 Dec 2024 18:35:07 +0800
> 
> 
> for example:
> I create a scratch init.el:
> ```elisp
> 
> 
> (defun header0()
>   "header_line_head")
> (defun header1()
>   "header_line_tail")
> 
> (add-to-list 'header-line-format '(:eval (header0)) t)
> (add-to-list 'header-line-format mode-line-format-right-align t)
> (add-to-list 'header-line-format '(:eval (header1)) t)
> ```
> 
> Then start emacs, I got: https://imgur.com/a/PHGxRyf
> 
> You can see, in the right side of header-line, it's wrong, not right align well.

This feature doesn't work in header-line, only in mode-line.  It
specifically looks at mode-line-format.

bug#74817: 31.0.50; mode-line-format-right-align doesn't work well on header-line

[Ship Mints]

[-- Attachment #1: Type: text/plain, Size: 2200 bytes --]

To emulate the desired behavior, I lifted this from tab-bar's
implementation for a proof-of-concept.

(defun header-line-format-align-right ()
  "Align the rest of `header-line' items to the right."
  (let* ((rest (cdr (member '(:eval (header-line-format-align-right))
header-line-format)))
         (rest (tab-bar-format-list rest)) ; replace tab-bar-format-list
with your own beyond this POC
         (rest (mapconcat (lambda (item) (nth 2 item)) rest ""))
         (hpos (progn
                 (add-face-text-property 0 (length rest) 'header-line t
rest)
                 (string-pixel-width rest)))
         (str (propertize " " 'display
                          ;; The `right' spec doesn't work on TTY frames
                          ;; when windows are split horizontally (bug#59620)
                          (if (window-system)
                              `(space :align-to (- right (,hpos)))
                            `(space :align-to (,(- (frame-inner-width)
hpos)))))))
    `((align-right menu-item ,str ignore))))

(setq header-line-format '("TEST HEADER LINE" (:eval
(header-line-format-align-right)) (lambda () "FOO BAR BAZ")))

One gotcha is that tab-bar-format-list relies on "rest" being a list of
functions, hence the lambda at the end.

Adapt as you see fit.

-Stephane

On Sat, Dec 14, 2024 at 5:56 AM Eli Zaretskii <eliz@gnu.org> wrote:

> tags 74817 notabug wontfix
> thanks
>
> > From: Eval Exec <execvy@gmail.com>
> > Date: Thu, 12 Dec 2024 18:35:07 +0800
> >
> >
> > for example:
> > I create a scratch init.el:
> > ```elisp
> >
> >
> > (defun header0()
> >   "header_line_head")
> > (defun header1()
> >   "header_line_tail")
> >
> > (add-to-list 'header-line-format '(:eval (header0)) t)
> > (add-to-list 'header-line-format mode-line-format-right-align t)
> > (add-to-list 'header-line-format '(:eval (header1)) t)
> > ```
> >
> > Then start emacs, I got: https://imgur.com/a/PHGxRyf
> >
> > You can see, in the right side of header-line, it's wrong, not right
> align well.
>
> This feature doesn't work in header-line, only in mode-line.  It
> specifically looks at mode-line-format.
>
>
>
>

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