Radshift

Radshift is a fork of Redshift, with most of its functionality ripped out.

Why?

I believe that Redshift is good software, but much too complex and feature-rich for what it actually does: set the screen temperature. In particular, Redshift talks to GeoClue to determine location to then set the screen temperature. Radshift simply looks at the system time. Redshift provides different methods of changing the screen temperature, and works on Linux, macOS, and Windows. Radshift provides only one method, and only works on Linux. Redshift is over 6000 lines of C code, Radshift less than 1000 lines of C code.

Configuration

All configuration is optional. Defaults are already set, and radshift should compile and work without any changes. You may, however, want to:

• edit include/config.h to set your preferred times and temperatures. There's planned support for a config file and environment variables.
• edit Makefile to set the install-prefix (and any compilation options you want). You can also install with make INSTALL_PREFIX=/path/to/radshift/binary install.
• edit systemd/radshift.service to your liking.

Installation

You need to have ibxcb-randr0-dev installed if you are using Ubuntu.

These are the suggested steps to install radshift:

1. make && sudo make install
2. (optional) cp systemd/radshift.service ~/.config/systemd/user/
3. (optional) systemctl --user enable radshift.service
4. (optional) systemctl --user start radshift.service

You may also skip the sudo make install step, and simply set radshift's location in the .service file.

Usage

I recommend you use the Systemd User service. But you can also use Radshift manually, e.g. radshift --auto to automatically set the screen temperature to an appropriate value. Or radshift 5000K to set screen temperature to 5000 Kelvin. You could also add radshift --continuous & to your .xinitrc, i3 config, or similar startup/configuration file. See radshift --help for more information.

Attribution

Radshift's core functionality (setting screen temperature) was taken from Redshift. Radshift is thus also licensed under GPL Version 3.

Jon Lund Steffensen is the copyright holder of Redshift, as well as the following files contained in Radshift:

• src/gamma-randr.c
• include/gamma-randr.h
• include/colorramp.h

Jon Lund Steffensen and Ingo Thies are the copyright holders of the following file contained in Radshift:

• src/colorramp.c

Ingo Thies is the copyright holder of the following file contained in Radshift:

• README-colorramp