Automatically show an on-screen keyboard.

auto-onscreen-keyboard.sh

#!/bin/sh

# Automatically show an on-screen keyboard when enabling tablet mode.
# The script depends on the acpi_listen program from the acpid package,
# and the onboard program from the onboard package.

listener() {
	pid=
	while read -r line; do
		if [ "$line" = 00000001 ]; then
			onboard &
			pid=$!
		else
			kill $pid
		fi
	done
}

acpi_listen \
	| grep --line-buffered "video/tabletmode" \
	| stdbuf -oL cut -d' ' -f4 | listener