nixos-config/home/use-xdg.nix

{ config, ... }:
{
  home.sessionVariables = {
    ANDROID_USER_HOME = "${config.xdg.dataHome}/android";
    CARGO_HOME = "${config.xdg.dataHome}/cargo";
    DOTNET_CLI_HOME = "${config.xdg.dataHome}/dotnet";
    DVDCSS_CACHE = "${config.xdg.dataHome}/dvdcss";
    GRADLE_USER_HOME = "${config.xdg.dataHome}/gradle";
    IPYTHONDIR = "${config.xdg.configHome}/ipython";
    JUPYTER_CONFIG_DIR = "${config.xdg.configHome}/jupyter";
    LESSHISTFILE = "${config.xdg.stateHome}/less/history";
    NPM_CONFIG_USERCONFIG = "${config.xdg.configHome}/npm/npmrc";
    NUGET_PACKAGES = "${config.xdg.cacheHome}/nuget/packages";
    PARALLEL_HOME = "${config.xdg.configHome}/parallel";
    PLATFORMIO_CORE_DIR = "${config.xdg.dataHome}/platformio";
    PYTHONSTARTUP = "${config.xdg.configHome}/python/pythonrc";
  };

  xdg.configFile = {
    "npm/npmrc".text = ''
      prefix=${config.xdg.dataHome}/npm
      cache=${config.xdg.cacheHome}/npm
    '';
    "python/pythonrc".text = ''
      def is_vanilla() -> bool:
          import sys
          return not hasattr(__builtins__, '__IPYTHON__') and 'bpython' not in sys.argv[0]


      def setup_history():
          import atexit
          import readline
          from pathlib import Path

          state_home = Path("${config.xdg.stateHome}")
          history = state_home / "python" / "history"

          readline.read_history_file(str(history))
          atexit.register(readline.write_history_file, str(history))


      if is_vanilla():
          setup_history()
    '';
  };
}