I found this tool is very dangerous, Accidentallyi provided my root drive path as output directory and tool deleted all the content of my drive silently without asking for permission or even notyfying me. i recommend you to please check this tool and use carefully.
C:\Users\masarrat.siddiqui\Downloads\tattletale-1.1.2.Final\tattletale-1.1.2.Final>java -Xmx512m -jar tattletale.jar f:\workspace\br_LPC_API f:\
As you can see i used f: drive as output folder, it deleted all the data from my F: drive silently. This behavior was unexpected and atleast it should show some warning before deleting files/directory.