configuration.nix/home/gui/sway-config.nix

{
  config,
  pkgs,
}: let
  cfg = config.jhome.gui.sway;
  modifier = "Mod4";
  terminal = config.jhome.gui.terminal;
  termCmd =
    if terminal == "wezterm"
    then "wezterm start"
    else if terminal == "alacritty"
    then "alacritty -e"
    else builtins.abort "no command configured for ${terminal}";
  menu = "${pkgs.fuzzel}/bin/fuzzel --terminal '${termCmd}'";
  # currently, there is some friction between sway and gtk:
  # https://github.com/swaywm/sway/wiki/GTK-3-settings-on-Wayland
  # the suggested way to set gtk settings is with gsettings
  # for gsettings to work, we need to tell it where the schemas are
  # using the XDG_DATA_DIR environment variable
  # run at the end of sway config
  configure-gtk = let
    schema = pkgs.gsettings-desktop-schemas;
    datadir = "${schema}/share/gsettings-schemas/${schema.name}";
  in
    pkgs.writers.writeDashBin "configure-gtk" ''
      export XDG_DATA_DIRS=${datadir}:$XDG_DATA_DIRS
      gnome_schema=org.gnome.desktop.interface
      config="${config.xdg.configHome}/gtk-3.0/settings.ini"
      if [ ! -f "$config" ]; then exit 1; fi
      # Read settings from gtk3
      gtk_theme="$(${pkgs.gnugrep}/bin/grep 'gtk-theme-name' "$config" | ${pkgs.gnused}/bin/sed 's/.*\s*=\s*//')"
      icon_theme="$(${pkgs.gnugrep}/bin/grep 'gtk-icon-theme-name' "$config" | ${pkgs.gnused}/bin/sed 's/.*\s*=\s*//')"
      cursor_theme="$(${pkgs.gnugrep}/bin/grep 'gtk-cursor-theme-name' "$config" | ${pkgs.gnused}/bin/sed 's/.*\s*=\s*//')"
      font_name="$(grep 'gtk-font-name' "$config" | sed 's/.*\s*=\s*//')"
      ${pkgs.glib}/bin/gsettings set "$gnome_schema" gtk-theme "$gtk_theme"
      ${pkgs.glib}/bin/gsettings set "$gnome_schema" icon-theme "$icon_theme"
      ${pkgs.glib}/bin/gsettings set "$gnome_schema" cursor-theme "$cursor_theme"
      ${pkgs.glib}/bin/gsettings set "$gnome_schema" font-name "$font_name"
      ${pkgs.glib}/bin/gsettings set "$gnome_schema" color-scheme prefer-dark
    '';
  cmdOnce = command: {inherit command;};
  cmdAlways = command: {
    inherit command;
    always = true;
  };
in {
  inherit modifier terminal menu;
  keybindings = import ./keybindings.nix {inherit config pkgs;};
  # Appearance
  bars = []; # Waybar is started as a systemd service
  gaps = {
    smartGaps = true;
    smartBorders = "on";
    inner = 4;
  };
  output."*".bg = "${cfg.background} fill";
  # Window Appearance
  window.border = 2;
  # Make certain windows floating
  window.commands = [
    {
      command = "floating enable";
      criteria.title = "zoom";
    }
    {
      command = "floating enable";
      criteria.class = "floating";
    }
    {
      command = "floating enable";
      criteria.app_id = "floating";
    }
  ];
  # Startup scripts
  startup =
    [
      (cmdAlways "${configure-gtk}/bin/configure-gtk")
    ]
    ++ (builtins.map cmdAlways cfg.exec.always)
    ++ (builtins.map cmdOnce cfg.exec.once);
  # Keyboard configuration
  input."type:keyboard" = {
    repeat_delay = "300";
    repeat_rate = "50";
    xkb_options = "caps:swapescape,compose:ralt";
    xkb_numlock = "enabled";
  };
  # Touchpad
  input."type:touchpad" = {
    click_method = "clickfinger";
    natural_scroll = "enabled";
    scroll_method = "two_finger";
    tap = "enabled";
    tap_button_map = "lrm";
  };
}