[Feature Request]: Linux: theme: auto switch

[yuioto]

Discussed in https://github.com/xfangfang/wiliwili/discussions/177

^{Originally posted by **yuioto** July 27, 2023} # wiliwili 的自动暗黑模式不在Linux工作 原讨论大致为wiliwili不支持在Linux下识别主题。只能通过启动时读取环境变量或配置文件overwrite。

[yuioto]

Support org.freedesktop.appearance.color-scheme to retreive system dark mode

There is now a desktop environment independent way to query the system dark mode: The org.freedesktop.appearance.color-scheme key in the XDG desktop portal.

It's also possible to be notified during runtime as soon as the dark mode preference changes.

Example desktop environments that have support for this key are:

• KDE Plasma
• Gnome
• And others WMs if org.freedesktop.appearance.color-schemesupposed.

More info

• Gnome blog post
• XDG Desktop Portal spec

Example apps and implementations that already support this key

• KeepassXC
• Telegram Desktop

On Linux shell get dbus message

gdbus call --session --timeout=1000 \ 
--dest=org.freedesktop.portal.Desktop \ 
--object-path /org/freedesktop/portal/desktop \ 
--method org.freedesktop.portal.Settings.Read org.freedesktop.appearance color-scheme

Copy from: https://unix.stackexchange.com/questions/701432/command-for-detecting-whether-the-system-is-using-a-dark-or-light-desktop-theme