Parse filename and add keywords to PDF file (sample) using exiftool

gistfile1.applescript

tell application "Finder"
	set theFolder to alias "Mac mini:Users:steven:SkyDrive:Receipts"
	set thePDFs to every file in theFolder
	repeat with eachPDF in thePDFs
		try
			set theFileName to the name of eachPDF
			set theDate to (text 6 thru 7 of theFileName) & "/" & (text 9 thru 10 of theFileName) & "/" & (text 1 thru 4 of theFileName)
			set theVendor to text 19 thru ((offset of "$" in theFileName) - 2) of theFileName
			set theAmount to text (offset of "$" in theFileName) thru ((offset of ".pdf" in theFileName) - 1) of theFileName
			set theKeywords to (quote & "vendor=" & theVendor & ", date=" & theDate & ", amount=\\" & theAmount & quote) as text
			set thePOSIXFileName to ("/Users/steven/SkyDrive/Receipts/" & theFileName) as Unicode text
			set runCmd to (do shell script "/usr/bin/exiftool " & the quoted form of thePOSIXFileName & " -keywords=" & theKeywords)
		end try
	end repeat
end tell