116 lines
		
	
	
		
			2.8 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
			
		
		
	
	
			116 lines
		
	
	
		
			2.8 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
{ config, lib, pkgs, ... }:
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with lib;
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let
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  cfg = config.services.redshift;
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in {
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  options.services.redshift = {
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    enable = mkOption {
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      type = types.bool;
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      default = false;
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      example = true;
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      description = ''
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        Enable Redshift to change your screen's colour temperature depending on
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        the time of day.
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      '';
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    };
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    latitude = mkOption {
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      type = types.str;
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      description = ''
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        Your current latitude, between
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        <literal>-90.0</literal> and <literal>90.0</literal>.
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      '';
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    };
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    longitude = mkOption {
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      type = types.str;
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      description = ''
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        Your current longitude, between
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        between <literal>-180.0</literal> and <literal>180.0</literal>.
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      '';
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    };
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    temperature = {
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      day = mkOption {
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        type = types.int;
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        default = 5500;
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        description = ''
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          Colour temperature to use during the day, between
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          <literal>1000</literal> and <literal>25000</literal> K.
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        '';
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      };
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      night = mkOption {
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        type = types.int;
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        default = 3700;
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        description = ''
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          Colour temperature to use at night, between
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          <literal>1000</literal> and <literal>25000</literal> K.
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        '';
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      };
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    };
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    brightness = {
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      day = mkOption {
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        type = types.str;
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        default = "1";
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        description = ''
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          Screen brightness to apply during the day,
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          between <literal>0.1</literal> and <literal>1.0</literal>.
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        '';
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      };
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      night = mkOption {
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        type = types.str;
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        default = "1";
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        description = ''
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          Screen brightness to apply during the night,
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          between <literal>0.1</literal> and <literal>1.0</literal>.
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        '';
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      };
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    };
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    package = mkOption {
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      type = types.package;
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      default = pkgs.redshift;
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      defaultText = "pkgs.redshift";
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      description = ''
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        redshift derivation to use.
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      '';
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    };
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    extraOptions = mkOption {
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      type = types.listOf types.str;
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      default = [];
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      example = [ "-v" "-m randr" ];
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      description = ''
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        Additional command-line arguments to pass to
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        <command>redshift</command>.
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      '';
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    };
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  };
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  config = mkIf cfg.enable {
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    systemd.user.services.redshift = {
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      description = "Redshift colour temperature adjuster";
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      wantedBy = [ "default.target" ];
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      serviceConfig = {
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        ExecStart = ''
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          ${cfg.package}/bin/redshift \
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            -l ${cfg.latitude}:${cfg.longitude} \
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            -t ${toString cfg.temperature.day}:${toString cfg.temperature.night} \
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            -b ${toString cfg.brightness.day}:${toString cfg.brightness.night} \
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            ${lib.strings.concatStringsSep " " cfg.extraOptions}
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        '';
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        RestartSec = 3;
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        Restart = "always";
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      };
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      environment = { DISPLAY = ":0"; };
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    };
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  };
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}
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