nix-config/home/features/desktop/hyprland/default.nix

{ pkgs, ... }:
let
  cmd = "busctl --user -- set-property rs.wl-gammarelay / rs.wl.gammarelay Temperature q";
in
{
  imports = [ ./config.nix ./variables.nix ];
  home.packages = with pkgs; [
    swww
    hyprpicker
    # hyprsunset
    # wl-gammarelay-rs
    wofi
    hyprshade
    hyprpolkitagent
    grim
    slurp
    wl-clip-persist
    cliphist
    wf-recorder
    glib
    wayland
    direnv
    alacritty
  ];
  wayland.windowManager.hyprland = {
    enable = true;
    xwayland.enable = true;
    systemd.enable = true;
    plugins = [ pkgs.hyprlandPlugins.hyprsplit ];
  };
  programs.waybar = {
    enable = true;
    systemd.enable = true;
    settings = {
      mainBar = {
        layer = "top";
        position = "top";

        modules-left = [ "hyprland/workspaces" ];
        modules-center = [ "hyprland/window" ];
        modules-right = [ "tray" "memory" "cpu" "clock" ];

        tray.spacing = 10;

        clock.tooltip-format = "{:%d.%m.%Y}";
        cpu.format = "{}%  ";
        memory.format = " {}%  ";

        "hyprland/workspaces" = {
          format = "{icon}";
          persistent-workspaces = {
            "*" = 10;
          };
          format-icons = {
            "9" = "";
            "10" = "󰝚";
          };
        };
      };
    };
  };

  xdg.configFile."hypr/shaders/bluelight.glsl".text = ''
    precision highp float;
    varying vec2 v_texcoord;
    uniform sampler2D tex;

    const float temperature = 4000.0;
    const float temperatureStrength = 1.0;

    #define WithQuickAndDirtyLuminancePreservation
    const float LuminancePreservationFactor = 1.0;

    // function from https://www.shadertoy.com/view/4sc3D7
    // valid from 1000 to 40000 K (and additionally 0 for pure full white)
    vec3 colorTemperatureToRGB(const in float temperature) {
        // values from: http://blenderartists.org/forum/showthread.php?270332-OSL-Goodness&p=2268693&viewfull=1#post2268693
        mat3 m = (temperature <= 6500.0) ? mat3(vec3(0.0, -2902.1955373783176, -8257.7997278925690),
                                                vec3(0.0, 1669.5803561666639, 2575.2827530017594),
                                                vec3(1.0, 1.3302673723350029, 1.8993753891711275))
                                         : mat3(vec3(1745.0425298314172, 1216.6168361476490, -8257.7997278925690),
                                                vec3(-2666.3474220535695, -2173.1012343082230, 2575.2827530017594),
                                                vec3(0.55995389139931482, 0.70381203140554553, 1.8993753891711275));
        return mix(clamp(vec3(m[0] / (vec3(clamp(temperature, 1000.0, 40000.0)) + m[1]) + m[2]), vec3(0.0), vec3(1.0)),
                   vec3(1.0), smoothstep(1000.0, 0.0, temperature));
    }

    void main() {
        vec4 pixColor = texture2D(tex, v_texcoord);

        // RGB
        vec3 color = vec3(pixColor[0], pixColor[1], pixColor[2]);

    #ifdef WithQuickAndDirtyLuminancePreservation
        color *= mix(1.0, dot(color, vec3(0.2126, 0.7152, 0.0722)) / max(dot(color, vec3(0.2126, 0.7152, 0.0722)), 1e-5),
                     LuminancePreservationFactor);
    #endif

        color = mix(color, color * colorTemperatureToRGB(temperature), temperatureStrength);

        vec4 outCol = vec4(color, pixColor[3]);

        gl_FragColor = outCol;
    }
  '';

  # systemd.user.services.wl-gammarelay-rs = {
  #   Unit = {
  #     PartOf = [ "graphical-session.target" ];
  #     After = [ "graphical-session-pre.target" ];
  #   };
  #
  #   Service = {
  #     ExecStart = "${pkgs.wl-gammarelay-rs}/bin/wl-gammarelay-rs";
  #     ExecReload = "${pkgs.coreutils}/bin/kill -SIGUSR2 $MAINPID";
  #     Restart = "on-failure";
  #     KillMode = "mixed";
  #   };
  #
  #   Install = { WantedBy = [ "default.target" ]; };
  # };
  # systemd.user.services.wl-gammarelay-rs-restart = {
  #   Unit = {
  #     After = [ "suspend.target" "hibernate.target" "hybrid-sleep.target" "suspend-then-hibernate.target" ];
  #   };
  #
  #   Service = {
  #     ExecStart = "${pkgs.bash}/bin/bash -c '${cmd} 6000 && ${cmd} 4000'";
  #   };
  #
  #   Install = { WantedBy = [ "suspend.target" "hibernate.target" "hybrid-sleep.target" "suspend-then-hibernate.target" ]; };
  # };
}