self: super: {
  pinch = if builtins.hasAttr "pinch" super then
    super.pinch
  else
    super.writeShellScriptBin "pinch" ''
      exec ${self.python3}/bin/python3 ${
        super.fetchgit {
          url = "https://scottworley.com/pinch.git";
          rev = "1.2";
          sha256 = "0s0rk1m0irsdj0xjnix9y1825pjv7lhbmnn73jgjbj1hi6wqwpfh";
        }
      }/pinch.py "$@"
    '';
}