vol_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}"
icon_mute=
icon_off=
icon_low=
icon_high=

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

    # pamixer --get-mute return true or false
    # with a 0 exit code
    if [ "$(pamixer --get-mute)" = true ]; then
        icon=$icon_mute

    elif [ "$percent" -gt 50 ]; then
        icon=$icon_high

    elif [ "$percent" -gt 0 ]; then
        icon=$icon_low

    else
        icon=$icon_off
    fi
    echo -ne "\n$icon "
    if [ "$percent" -gt 0 ]; then
        printf "%0.s█" $(seq $completed)
    fi
    [[ $remaining != 0 ]] && printf "%0.s " $(seq $remaining)
}

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

case $action in
    "up" )
        pamixer --increase "$step" --sink @DEFAULT_SINK@
    ;;
    "down" )
        pamixer --decrease "$step" --sink @DEFAULT_SINK@
    ;;
    "mute" )
        pamixer --toggle-mute --sink @DEFAULT_SINK@
    ;;
    * )
        usage
    ;;
esac
set +o errexit
percent=$(pamixer --get-volume)
set -o errexit
progress "$percent"