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{catppuccinTheme}: {
  pkgs,
  lib,
  ...
}: {
  programs = let
    # Convert the input string's first character to upper case.
    # Example: "foo" -> "Foo"
    toCapital = with lib;
      str: let
        len = builtins.stringLength str;
        head = strings.toUpper (builtins.substring 0 1 str);
        tail = builtins.substring 1 (len - 1) str;
      in
        head + tail;
  in {
    # The fast, feature-rich, GPU based terminal emulator
    # https://sw.kovidgoyal.net/kitty/
    kitty = {
      enable = true;

      font = {
        name = "Dank Mono";
        size = 16;
      };

      # Kitty's customisability is top-notch.
      keybindings = {
        "kitty_mod+t" = "new_tab_with_cwd";
        "kitty_mod+n" = "new_window_with_cwd";

        "kitty_mod+r" = "start_resizing_window";
        "kitty_mod+s" = "swap_with_window";
        "kitty_mod+f" = "focus_visible_window";

        "kitty_mod+k" = "neighboring_window top";
        "kitty_mod+h" = "neighboring_window left";
        "kitty_mod+j" = "neighboring_window down";
        "kitty_mod+l" = "neighboring_window right";

        "kitty_mod+a" = "next_layout";
      };

      settings = {
        # Background
        background_opacity = "0.9";

        # Layouts
        enabled_layouts = "fat,tall,grid,horizontal,vertical,splits";

        # Tabs
        tab_bar_edge = "top";
        tab_bar_style = "powerline";
      };

      shellIntegration = {
        enableBashIntegration = true;
        enableZshIntegration = true;
      };

      theme = "Catppuccin-${toCapital catppuccinTheme}";
    };
  };
}