light_bar

#!/bin/bash
#
# Copyright (C) 2017 barbUk
#
# 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, either version 3 of the License, or (at your option) any later
# version.
#
# 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 -o errexit -o pipefail -o nounset

action="${1:-''}"
step="${2:-5}"

progress() {
    local percent=$1
    local completed=$(( percent / 5 ))
    local remaining=$(( 20 - completed ))

    echo -ne "\n "
    printf "%0.s█" $(seq $completed)
    [[ $remaining != 0 ]] && printf "%0.s " $(seq $remaining)
}

usage() {
    echo "Usage: $0 up/down [step]" >&2
    echo "Example: $0 up 5" >&2
    exit 1
}

case $action in
    "up" )
        percent=$(brightnessctl --machine-readable s "+$step%" | awk -F'[,%]' '{print $4}')
    ;;
    "down" )
        percent=$(brightnessctl --machine-readable s "$step%-" | awk -F'[,%]' '{print $4}')
    ;;
    * )
        usage
    ;;
esac

progress "$percent"