Find unique files on Mac

I want a program written for OSx that will allow the user to: 1) Select a parent directory (A) 2) Select a second directory (B) (could be on a different drive) 3) Return a list of files that are on (B) but NOT on (A) Should compare, size, name, and modified date. Information should be returned in a table that includes FileName, location, Size, and Modified Date. Should be able to sort table in header ascending and descending by Name, Size or modified date. 4) For each file in the table user should be able to click on the file and select "Reveal in Finder" which would open finder and show the file location, or "Open in Finder" which would open the file with its default application. Objective C Mac OSx Include executable