Waytemp

A Wayland color temperature control daemon written in Common Lisp. Set, raise, and lower the blue-light filter from a script, a window manager binding, or a keyboard knob.

GitHub repository Install

Waytemp · Properties

Language: Common Lisp · C core for gamma control
Platform: Wayland (niri, Hyprland, and peers with gamma control)
Architecture: Daemon and client over a local socket
Temperature: 1000–25000 K, with gamma correction
Config: Readable Lisp at ~/.config/waytemp/config.lisp
License: COLL
Repository: luciusmagn/waytemp

What it does

Waytemp is inspired by wl-sunset, focused on direct control rather than astronomical schedules. A long-running daemon owns the Wayland gamma connection; short client commands change temperature and gamma without reconnecting each time.

Control surface

Absolute set and relative increase or decrease
Gamma adjustment alongside temperature
Persistent configuration loaded on daemon start
Automatic retry when the compositor drops the connection

Limits

There are no sunrise or sunset calculations yet. If you want schedule-driven transitions, the daemon is the right place to attach them — contributions welcome on GitHub.

Install

Requires a Common Lisp implementation (SBCL recommended), Quicklisp, a C compiler, and Wayland development packages (wayland-devel, wayland-protocols-devel, pkg-config).

From source

git clone git@github.com:luciusmagn/waytemp.git
cd waytemp
make install

Nix flake

nix build .#waytemp-distrib
# binaries land in ./result

The waytemp-distrib derivation produces a portable binary tree.

Usage

Start the daemon once, then issue client commands from your shell, scripts, or window manager.

Commands

waytemp daemon          # start the daemon
waytemp get             # current temperature
waytemp set 3500        # absolute Kelvin
waytemp inc 1000        # raise by 1000K
waytemp dec             # lower by 100K
waytemp gamma 1.2       # set gamma
waytemp save-config     # persist current values
waytemp quit            # stop the daemon

Configuration

State is stored at ~/.config/waytemp/config.lisp and loaded when the daemon starts. The file is ordinary Common Lisp evaluated in the WAYTEMP package, so you can call and override functions as needed. The last form must evaluate to an instance of waytemp:config.

License: COLL (Configurable Open Lisp License). See LICENSE.lisp in the repository.

~/.config/waytemp/config.lisp

;; evaluated in package WAYTEMP
(make-instance 'config
  :temperature 4500
  :gamma 1.0d0)