darklightd

Monitor the desktop appearance settings for light/dark mode, and update application settings accordingly.

Whenever the desktop appearance changes this small daemon updates a settings which do not otherwise apply dark mode automatically:

• Change the legacy Gtk theme to Adwaita-dark when dark mode is enabled, and reset it to the default otherwise.
• Change the Helix theme (see below).

Helix instructions.

To dynamically reconfigure Helix darklightd symlinks

• ~/.config/helix/themes/darklightd-default.toml for no preference, or
• ~/.config/helix/themes/darklightd-light.toml for light mode, or
• ~/.config/helix/themes/darklightd-dark.toml for dark mode

to ~/.config/helix/themes/darklightd-auto.toml whenever the colour scheme changes. If the light or dark variants are missing it uses darklightd-default.toml instead. To make use of this dynamically reconfigured theme set theme = "darklightd-auto" in ~/.config/helix/config.toml`.

For instance, to make helix follow the GNOME theme with Adwaita create the following two files:

# ~/.config/helix/lightdarkd-default.toml
inherits = "adwaita-light"

# ~/.config/helix/lightdarkd-dark.toml
inherits = "adwaita-dark"

And then set theme in ~/.config/helix/config.toml:

theme = "darklightd-auto"

Installation

$ cargo build release
$ run0 install -m755 target/release/lightdarkd /usr/local/bin/lightdarkd
$ run0 install -m644 systemd/lightdarkd.service /usr/local/lib/systemd/user/lightdarkd.service
$ systemctl --user daemon-reload
$ systemctl --user enable --now lightdarkd.service

License

Copyright Sebastian Wiesner [email protected]

This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.