urxvt-solarized

Perl extension for rxvt-unicode to apply the Solarized color palette based on whether it is day (light mode) or night (dark mode) at a given location.

Setup

Create an extension directory:

$ mkdir -p ~/.urxvt/ext

Download the extension:

$ wget -O ~/.urxvt/ext/solarized \
    https://raw.githubusercontent.com/agorf/urxvt-solarized/master/solarized

Or clone the repository and symlink the file:

$ git clone https://github.com/agorf/urxvt-solarized.git
$ ln -s $PWD/urxvt-solarized/solarized ~/.urxvt/ext/solarized

Install the DateTime::Event::Sunrise Perl module used by the extension to calculate sunrise/sunset times. For Debian:

$ sudo apt install libdatetime-event-sunrise-perl

Enable it in your ~/.Xresources or equivalent:

URxvt.perl-ext-common:     solarized
URxvt.keysym.Mod4-c:       perl:solarized:toggle
URxvt.solarized.latitude:  37.9838
URxvt.solarized.longitude: 23.7275
URxvt.solarized.altitude:  -0.833

Things to note:

Super+C can be used to temporarily switch between dark and light mode in the context of the current terminal
The latitude and longitude of Athens, Greece, is used to determine sunrise and sunset times (necessary for the automatic switching)
The default altitude of -0.833 is used (can be omitted). From the module's documentation:

This is the height of the Sun at sunrise or sunset. In astronomical context, the altitude or height is the angle between the Sun and the local horizon. It is expressed as degrees, usually with a negative number, since the Sun is below the horizon. Default value is -0.833, that is when the sun's upper limb touches the horizon, while taking in account the light refraction. Positive altitude are allowed, in case the location is near a mountain range behind which the sun rises or sets.

Now merge the changes:

$ xrdb -merge ~/.Xresources

You are ready to use Solarized!

Author

Based on the work of BobuSumisu/urxvt-solarized and carlhals/toggle-colorscheme

Automatic light (day) and dark (night) mode switching implemented by Angelos Orfanakos