zsh: cleanup mktemp files on script exit/term

gistfile1.txt

#!/usr/bin/env zsh
MKTEMP_BIN="$(which mktemp)"
tempfiles="$(mktemp)"
function mktemp(){
	local filename="$($MKTEMP_BIN "${@}")"
	echo "$filename" >> "$tempfiles"
	echo "$filename"
}
function on_exit() {
	test -f "$tempfiles" && {
		#echo "starting on_exit cleanup"
		while read file; do
			#echo removing $file
			test -f "$file" && rm -f "$file"
		done < "$tempfiles"
		#echo "removing $tempfiles (tempfile list)"
		test -f "$tempfiles" && rm -f "$tempfiles"
	}
}
trap on_exit EXIT INT TERM

# now when we use mktemp in this script, it will go thru the function mktemp 
# and then on EXIT/INT/TERM the trap on_exit will delete these files