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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.redshift;
in {
options.services.redshift = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Enable Redshift to change your screen's colour temperature depending on
the time of day.
'';
};
latitude = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
Your current latitude, between
<literal>-90.0</literal> and <literal>90.0</literal>. Must be provided
along with longitude.
'';
};
longitude = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
Your current longitude, between
between <literal>-180.0</literal> and <literal>180.0</literal>. Must be
provided along with latitude.
'';
};
provider = mkOption {
type = types.enum [ "manual" "geoclue2" ];
default = "manual";
description = ''
The location provider to use for determining your location. If set to
<literal>manual</literal> you must also provide latitude/longitude.
'';
};
temperature = {
day = mkOption {
type = types.int;
default = 5500;
description = ''
Colour temperature to use during the day, between
<literal>1000</literal> and <literal>25000</literal> K.
'';
};
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>.
'';
};
};
package = mkOption {
type = types.package;
default = pkgs.redshift;
defaultText = "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>.
'';
};
};
config = mkIf cfg.enable {
assertions = [
{
assertion =
if cfg.provider == "manual"
then (cfg.latitude != null && cfg.longitude != null)
else (cfg.latitude == null && cfg.longitude == null);
message = "Latitude and longitude must be provided together, and with provider set to null.";
}
];
# needed so that .desktop files are installed, which geoclue cares about
environment.systemPackages = [ cfg.package ];
services.geoclue2.enable = mkIf (cfg.provider == "geoclue2") true;
systemd.user.services.redshift =
let
providerString =
if cfg.provider == "manual"
then "${cfg.latitude}:${cfg.longitude}"
else cfg.provider;
in
{
description = "Redshift colour temperature adjuster";
wantedBy = [ "graphical-session.target" ];
partOf = [ "graphical-session.target" ];
serviceConfig = {
ExecStart = ''
${cfg.package}/bin/redshift \
-l ${providerString} \
-t ${toString cfg.temperature.day}:${toString cfg.temperature.night} \
-b ${toString cfg.brightness.day}:${toString cfg.brightness.night} \
${lib.strings.concatStringsSep " " cfg.extraOptions}
'';
RestartSec = 3;
Restart = "always";
};
};
};
}
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