custom/notify-user.nix


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{ stdenv, writeTextFile
, ghcWithPackages
, user ? "gkleen"
, libnotify
}:

stdenv.mkDerivation {
  name = ''notify-${user}'';
  src = writeTextFile { name = ''notify-${user}.hs''; text = ''
    import Control.Shell
    import System.FilePath.Glob (glob)

    import Data.List (isPrefixOf)

    import Data.Either (either)

    main = do
      env <- shellEnv
      either print return =<< runSh (env { envWorkDir = "/" } ) $ do
        (envFile:_) <- liftIO $ glob "/home/${user}/.dbus/session-bus/*-0"
        sessionAddr <- snd . break (== '=') . head . filter ("DBUS_SESSION_BUS_ADDRESS=" `isPrefixOf`) . lines <$> input envFile 
        env <- getShellEnv
        withEnv "DBUS_SESSION_BUS_ADDRESS" sessionAddr $ run "${libnotify}/bin/notify-send" cmdline
  ''; };
  phases = [ "buildPhase" "installPhase" ];
  buildPhase = ''
    ${ghcWithPackages (p: with p; [ shellmate Glob ])}/bin/ghc -odir . -hidir . $src -o notify-${user}
  '';
  installPhase = ''
    mkdir -p $out/bin
    cp notify-${user} $out/bin
    chmod +x $out/bin/notify-${user}
  '';
}