Create OmniFocus items assigned to a context and project from a text file

gistfile1.applescript

tell application "OmniFocus"
	tell front document
		set theContext to first flattened context where its name = "Tesco"
		set theProject to first flattened project where its name = "Groceries Shopping"
		set txt to (read (POSIX file "/users/rjhyde/Dropbox/Documents/groceries.txt") as «class utf8»)
		set gitems to every paragraph of txt
		
		repeat with gitem in gitems
			if (length of gitem) > 0 then
				tell theProject to make new task with properties {name:gitem, context:theContext}
			end if
		end repeat
	end tell
end tell