gtk.nix

{ config, pkgs, lib, ... }:
let
  vars = import ./vars.nix;
  materia_colors = pkgs.writeTextFile {
    name = "gtk-generated-colors";
    text = ''
      BG=${vars.colors.base00}
      FG=FF00FF
      BTN_BG=FF00FF
      BTN_FG=FF00FF
      MENU_BG=FF00FF
      MENU_FG=FF00FF
      ACCENT_BG=FF00FF
      SEL_BG=FF00FF
      SEL_FG=FF00FF
      TXT_BG=FF00FF
      TXT_FG=FF00FF
      HDR_BTN_BG=FF00FF
      HDR_BTN_FG=FF00FF
      WM_BORDER_FOCUS=FF00FF
      WM_BORDER_UNFOCUS=FF00FF
      MATERIA_STYLE_COMPACT=True
      MATERIA_COLOR_VARIANT=dark
      UNITY_DEFAULT_LAUNCHER_STYLE=False
      NAME=generated
    '';
  };
in {

  nixpkgs.overlays = [(self: super: {
    generated-gtk-theme = self.stdenv.mkDerivation rec {
      name = "generated-gtk-theme";
      src = pkgs.materia-theme;
      buildInputs = with self; [ sassc bc which inkscape optipng ];
      installPhase = ''
        HOME=/build
        chmod 777 -R .
        patchShebangs .
        mkdir -p $out/share/themes
        substituteInPlace change_color.sh --replace "\$HOME/.themes" "$out/share/themes"
        echo "Changing colours:"
        ./change_color.sh -o Generated ${materia_colors}
        chmod 555 -R .
      '';
    };
  })];

  # GTK settings
  gtk = {
    enable = true;

    font = {
      name = "Source Code Pro Semibold";
    };

      iconTheme = {
        name = "Papirus-Dark";
        package = pkgs.papirus-icon-theme;
      };
      theme = {
        name = "Generated";
        package = pkgs.generated-gtk-theme;
      };
      gtk3.extraConfig.gtk-cursor-theme-name = "breeze";
    };

    home.sessionVariables.GTK_THEME = "Generated";


}