#!/bin/sh
# Identify the touchscreen and print the stable by-id path for config.env.
set -eu

echo "=== input devices reporting a touch-ish name ==="
found=
for ev in /dev/input/event*; do
	name=$(cat "/sys/class/input/$(basename "$ev")/device/name" 2>/dev/null || true)
	case "$name" in
	*[Tt]ouch* | *TOUCH*)
		found=yes
		echo
		echo "  device: $ev"
		echo "  name:   $name"
		for l in /dev/input/by-id/* /dev/input/by-path/*; do
			[ -e "$l" ] || continue
			if [ "$(readlink -f "$l")" = "$(readlink -f "$ev")" ]; then
				echo "  stable: $l"
			fi
		done
		;;
	esac
done

if [ -z "$found" ]; then
	echo "  (none matched by name)"
	echo
	echo "Fall back to listing everything:"
	for ev in /dev/input/event*; do
		printf '  %-22s %s\n' "$ev" "$(cat "/sys/class/input/$(basename "$ev")/device/name" 2>/dev/null)"
	done
fi

echo
echo "Put the 'stable:' path (prefer /dev/input/by-id/) into TOUCH_DEV."
echo "Event numbers change across reboots; by-id symlinks do not."