nix/modules/stuff/i3.nix

{ lib, pkgs, config, ...}: let
  inherit (lib) mkIf mkEnableOption mkOption types optionals;
  cfg = config.chuj.stuff.i3;
  user = config.chuj.system.user;
in {
  options.chuj.stuff.i3 = {
    enable = mkEnableOption "i3";
    workspaceOutput = mkOption {
      type = types.attrsOf types.str;
      default = {};
    };
    communicators = mkOption {
      type = types.submodule {
        options = {
          autostart = mkOption {
            type = types.bool;
            default = true;
          };
          workspace = mkOption {
            type = types.str;
            default = "2";
          };
        };
      };
      default = {};
    };
  };
  
  config = let
    HOME = config.home-manager.users.${user}.home.homeDirectory;
  in mkIf cfg.enable {
    services.xserver.windowManager.i3.enable = true;
    home-manager.users.${user} = {
      xsession.windowManager.i3 = {
        enable = true;
        config = rec {
          assigns = mkIf (cfg.communicators.workspace != null) {
            ${cfg.communicators.workspace} = [
              { class = "discord"; }
              { class = "SchildiChat"; }
              { class = "element"; }
            ];
          };

          window = {
            border = 1;
            titlebar = true;
          };

          floating = {
            border = 1;
            titlebar = true;
            criteria = [
              { class = "zenity"; }
              { class = "fceux"; }
              { title = "Friends List"; }
            ];
          };

          gaps = {
            inner = 0;
            outer = 0;
          };

          fonts = {
            names = [ "JetBrains Mono NL" ];
            size = 10.0;
          };

          bars = [
            {
              inherit fonts;
              trayOutput = "primary";
              statusCommand = "${pkgs.i3status}/bin/i3status";
            }
          ];

          defaultWorkspace = "workspace number 1";

          workspaceOutputAssign = lib.mapAttrsToList
            (workspace: output: { inherit workspace output; })
            cfg.workspaceOutput;

          focus = {
            followMouse = true;
            mouseWarping = true;
            newWindow = "urgent";
          };

          startup = [
            { command = "autotiling &"; notification = false; }
            # { command = "mpd &"; notification = false; }
          ]
          ++ optionals config.chuj.stuff.dunst.enable [{ command = "dunst &"; notification = false; }]
          ++ optionals config.chuj.stuff.flameshot.enable [{ command = "flameshot &"; notification = false; }]
          ++ optionals cfg.communicators.autostart [
            { command = "i3-msg \"workspace ${cfg.communicators.workspace}; append_layout ${../../files/i3_communicators_layout.json}\""; notification = false; }
            { command = "discord &"; notification = false; }
            { command = "element-desktop &"; notification = false; }
          ];

          modes = let
            cmd_and_center = cmd: "exec --no-startup-id i3-msg '${cmd}' && i3-center-mouse-on-focus";
          in {
            resize = {
              "Left"   = cmd_and_center "resize shrink width  10 px or 10 ppt";
              "Right"  = cmd_and_center "resize grow   width  10 px or 10 ppt";
              "Up"     = cmd_and_center "resize shrink height 10 px or 10 ppt";
              "Down"   = cmd_and_center "resize grow   height 10 px or 10 ppt";
              "Escape" = "mode default";
            };
          };

          modifier = "Mod4";
          floating.modifier = "Mod4";

          keybindings = let
            mod = modifier;
            execns = "exec --no-startup-id";
            cmd_and_center = cmd: "${execns} i3-msg '${cmd}' && i3custom-center-mouse-on-focus";
          in {
            # Program keybinds
            "${mod}+Return" = ''${execns} ${if config.chuj.stuff.alacritty.enable then "alacritty" else "i3-sensible-terminal"}'';
            "${mod}+Shift+s" = mkIf config.chuj.stuff.flameshot.enable "${execns} flameshot gui";
            "${mod}+b"       = mkIf config.chuj.stuff.firefox.enable "${execns} firefox";
            "${mod}+d"       = "${execns} dmenu_run";
            "--release ${mod}+k" = "${execns} xkill";

            # Volume control
            "Ctrl+F9"  = "${execns} pamixer --toggle-mute";
            "Ctrl+F10" = "${execns} pamixer --decrease 5";
            "Ctrl+F11" = "${execns} pamixer --increase 5";

            # MPD controls
            # "Ctrl+F5" = "exec ~/music/select_music.sh";
            # "Ctrl+F6" = "exec mpc prev";
            # "Ctrl+F7" = "exec mpc toggle";
            # "Ctrl+F8" = "exec mpc next";
            # "Ctrl+Shift+F6" = "exec mpc seek -3";
            # "Ctrl+Shift+F7" = "exec mpc clear";
            # "Ctrl+Shift+F8" = "exec mpc seek +3";
            # "Ctrl+Shift+F10" = ''exec mpc volume -5 && dunstify "mpc $(mpc volume)" -r 420'';
            # "Ctrl+Shift+F11" = ''exec mpc volume +5 && dunstify "mpc $(mpc volume)" -r 420'';

            # General i3 keybindings
            "${mod}+f"       = cmd_and_center "fullscreen toggle";
            "${mod}+r"       = "mode resize";
            "${mod}+Shift+q" = cmd_and_center "kill";
            "${mod}+Shift+r" = "restart";
            "${mod}+Shift+e" = "${execns} i3-nagbar -t warning -m 'exit?' -b 'yes' 'i3-msg exit'";
            # Mouse bindings
            "--border button3" = "${execns} i3custom-window-actions";

            "${mod}+Left"        = cmd_and_center "focus left";
            "${mod}+Right"       = cmd_and_center "focus right";
            "${mod}+Up"          = cmd_and_center "focus up";
            "${mod}+Down"        = cmd_and_center "focus down";
            "${mod}+Shift+Left"  = cmd_and_center "move left";
            "${mod}+Shift+Right" = cmd_and_center "move right";
            "${mod}+Shift+Up"    = cmd_and_center "move up";
            "${mod}+Shift+Down"  = cmd_and_center "move down";

            "${mod}+q" = cmd_and_center "layout stacking";
            "${mod}+w" = cmd_and_center "layout tabbed";
            "${mod}+e" = cmd_and_center "layout toggle split";

            "${mod}+Shift+space" = "floating toggle; ${execns} i3custom-center-mouse-on-focus";
            "${mod}+space" = cmd_and_center "focus mode_toggle";

            "${mod}+1" = cmd_and_center "workspace number 1";
            "${mod}+2" = cmd_and_center "workspace number 2";
            "${mod}+3" = cmd_and_center "workspace number 3";
            "${mod}+4" = cmd_and_center "workspace number 4";
            "${mod}+5" = cmd_and_center "workspace number 5";
            "${mod}+6" = cmd_and_center "workspace number 6";
            "${mod}+7" = cmd_and_center "workspace number 7";
            "${mod}+8" = cmd_and_center "workspace number 8";
            "${mod}+9" = cmd_and_center "workspace number 9";
            "${mod}+0" = cmd_and_center "workspace number 10";

            "${mod}+Shift+1" = cmd_and_center "move container to workspace number 1";
            "${mod}+Shift+2" = cmd_and_center "move container to workspace number 2";
            "${mod}+Shift+3" = cmd_and_center "move container to workspace number 3";
            "${mod}+Shift+4" = cmd_and_center "move container to workspace number 4";
            "${mod}+Shift+5" = cmd_and_center "move container to workspace number 5";
            "${mod}+Shift+6" = cmd_and_center "move container to workspace number 6";
            "${mod}+Shift+7" = cmd_and_center "move container to workspace number 7";
            "${mod}+Shift+8" = cmd_and_center "move container to workspace number 8";
            "${mod}+Shift+9" = cmd_and_center "move container to workspace number 9";
            "${mod}+Shift+0" = cmd_and_center "move container to workspace number 10";
          };
        };
      };

      programs.i3status = {
        enable = true;
        enableDefault = false;

        general = {
          interval = 1;
          colors = true;
          color_good = "#91d956";
          color_bad = "#f43841";
          color_degraded = "#ffdd33";
          output_format = "i3bar";
        };

        modules = {
          # todo MPD module (using read_file most likely, or switch to i3blocks)

          "cpu_usage" = {
            position = 0;
            settings = {
              format = "cpu: %usage";
            };
          };

          "memory" = {
            position = 1;
            settings = {
              format = "mem: %used";
              threshold_degraded = "1G";
              format_degraded = "MEMORY < %available";
            };
          };

          "volume master" = {
            position = 2;
            settings = {
              color_degraded = "#333333";
              format = "vol: %volume";
              format_muted = "vol: ---";
            };
          };

          "tztime local" = {
            position = 3;
            settings = {
              format = "%Y-%m-%d %H:%M:%S (%A)";
            };
          };
        };
      };

      home.packages = with pkgs; [
        autotiling

        (pkgs.writeShellScriptBin "i3custom-center-mouse-on-focus" ''
          eval $(xdotool getwindowfocus getwindowgeometry --shell)
          MX=$(($X + $WIDTH / 2))
          MY=$(($Y + $HEIGHT / 2))
          xdotool mousemove $MX $MY
        '')

        (pkgs.writeShellScriptBin "i3custom-window-actions" ''
          ${pkgs.yad}/bin/yad --splash --mouse       \
              --title="i3 window actions"            \
              --gtkrc="${HOME}/.config/i3/i3gtk.css" \
              --text="i3 window actions"             \
              --button float:0 --button kill:1

          case $? in
            0) i3-msg "floating toggle";;
            1) i3-msg "kill";;
           -1) ;;
          esac
        '')

        (pkgs.writeShellScriptBin "i3custom-floating-toggle" ''
          i3-msg "mark --add _; [con_mark=f] floating disable, border pixel 1, mark --add --toggle _; [con_mark=_] floating enable, border normal; mark --add --toggle f;"
        '')
      ];

      home.file = {
        ".config/i3/i3gtk.css".source = ../../files/i3gtk.css;
      };
    };
  };
}