#!/bin/sh

# adapted from other script i wrote, also in the public domain
if [ "$(uname)" = "Linux" ]; then
	# this is a dirty hack.
	# acpi | awk '{print $4}' will print the battery percentage,
	# and s/,$// strips the trailing comma.
	printf "%s\n" "$(acpi | awk '{print $4}' | sed 's/,$//')"
elif [ "$(uname)" = "NetBSD" ]; then
	printf "%s\n" "$(envstat -s acpibat0:charge \
		| sed 1,2d \
		| cut -d ':' -f 2 \
		| awk '{print $1}' \
		| cut -d '.' -f 1)"
else
	printf "%s: unsupported system\n" "$(uname)" 1>&2
	exit 1
fi