focus-test

#!/usr/bin/env bash
# focus-test - Trivial Focus testing tool
# Copyright (C) 2018  Keyboard.io, Inc.
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 3.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.

set -e

OS=$(uname -s)

case ${OS} in
    Linux)
        DEVICE="${DEVICE:-/dev/ttyACM0}"
        stty -F "${DEVICE}" 9600 raw -echo
        ;;
    Darwin)
        DEVICE="${DEVICE:-/dev/cu.usbmodemCkbio01E}"
        stty -f "${DEVICE}" 9600 raw -echo
        ;;
    *)
        echo "Error Unknown OS : ${OS}" >&2
        exit 1
        ;;
esac


exec 3<"${DEVICE}"
echo "$@" >"${DEVICE}"

while read -r line <&3; do
    line="$(echo -n "${line}" | tr -d '\r')"
    if [ "${line}" == "." ]; then
        break
    fi
    echo "${line}"
done