nixpkgs/nixos/modules/services/x11/redshift.nix

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{ config, lib, pkgs, ... }:
with lib;
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let
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cfg = config.services.redshift;
in {
options.services.redshift = {
enable = mkOption {
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type = types.bool;
default = false;
example = true;
description = ''
Enable Redshift to change your screen's colour temperature depending on
the time of day.
'';
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};
latitude = mkOption {
type = types.str;
description = ''
Your current latitude, between
<literal>-90.0</literal> and <literal>90.0</literal>.
'';
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};
longitude = mkOption {
type = types.str;
description = ''
Your current longitude, between
between <literal>-180.0</literal> and <literal>180.0</literal>.
'';
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};
temperature = {
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day = mkOption {
type = types.int;
default = 5500;
description = ''
Colour temperature to use during the day, between
<literal>1000</literal> and <literal>25000</literal> K.
'';
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};
night = mkOption {
type = types.int;
default = 3700;
description = ''
Colour temperature to use at night, between
<literal>1000</literal> and <literal>25000</literal> K.
'';
};
};
brightness = {
day = mkOption {
type = types.str;
default = "1";
description = ''
Screen brightness to apply during the day,
between <literal>0.1</literal> and <literal>1.0</literal>.
'';
};
night = mkOption {
type = types.str;
default = "1";
description = ''
Screen brightness to apply during the night,
between <literal>0.1</literal> and <literal>1.0</literal>.
'';
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};
};
package = mkOption {
type = types.package;
default = pkgs.redshift;
description = ''
redshift derivation to use.
'';
};
extraOptions = mkOption {
type = types.listOf types.str;
default = [];
example = [ "-v" "-m randr" ];
description = ''
Additional command-line arguments to pass to
<command>redshift</command>.
'';
};
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};
config = mkIf cfg.enable {
systemd.services.redshift = {
description = "Redshift colour temperature adjuster";
requires = [ "display-manager.service" ];
after = [ "display-manager.service" ];
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wantedBy = [ "graphical.target" ];
serviceConfig.ExecStart = ''
${cfg.package}/bin/redshift \
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-l ${cfg.latitude}:${cfg.longitude} \
-t ${toString cfg.temperature.day}:${toString cfg.temperature.night} \
-b ${toString cfg.brightness.day}:${toString cfg.brightness.night} \
${lib.strings.concatStringsSep " " cfg.extraOptions}
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'';
environment = { DISPLAY = ":0"; };
serviceConfig.Restart = "always";
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};
};
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}