https://gist.github.com/wakuworks/5500063 を改良。ローカルファイルに grunt がなければ `npm install` を実行。さらにその後 `grunt` コマンド実行する

dogrunt.applescript

tell application "Finder"
	set myWin to window 1
	set theWin to (quoted form of POSIX path of (target of myWin as alias))
	tell application "Terminal"
		activate
		tell window 1
			do script "/bin/sh -c 'cd " & theWin & "; npm list grunt | grep empty >/dev/null 2>&1 && npm install; grunt'"
		end tell
	end tell
end tell