Applescript Progress bar from Curl output redirect

progressbar-osacompile.sh

#!/bin/bash

osacompile -x -o test.app<<EOF
set progress description to "Download progress indicator"
set progress additional description to "Preparing…"
set progress total steps to -1

delay 5
set i to 0
set progress total steps to 100
repeat until i = 100
	try
		set i to (do shell script "grep -p '.*[0-9].*' /Library/Logs/curlout.stderr | tr -u '\\r' '\\n' | tail -1 | awk '{print \$1}'")
		
		set progress additional description to "Download is  " & i & "% complete" 
		set progress completed steps to i
		delay 1
		
	on error thisErr
		display alert thisErr
		exit repeat
	end try
end repeat

EOF

sleep 3

open test.app