bin/do_mute.sh at master · themcfadden/bin · GitHub

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#!/usr/bin/env bash

function usage()
{
    cat <<HEREDOC
    Usage: $PROGRAM_NAME [NUM] [--delay NUM] [--help]
    optional arguments:
             NUM, -d, --delay NUM   Delay NUM seconds
             -h, --help             Show this help message and exit

    If no argument is specified, delay for 30 seconds.
HEREDOC
}

machine=Linux
function read_machine_type()
{
    unameOut="$(uname -s)"
    case "${unameOut}" in
    Linux*)     machine=Linux;;
    Darwin*)    machine=Mac;;
    CYGWIN*)    machine=Cygwin;;
    MINGW*)     machine=MinGw;;
    *)          machine="UNKNOWN:${unameOut}"
    esac
    echo ${machine}
}

function os_is()
{
    local n=0
    #if [[ "$1" = "-n" ]]; then n=1;shift; fi

    #echo $OS|grep $1 -i >/dev/null
    uname -s |grep -i "$1" >/dev/null

    return $(( $n ^ $? ))
}


function mute()
{

    os_is Darwin &&
    {
        current_volume=$(osascript -e 'output volume of (get volume settings)')
        osascript -e 'set volume output volume 0' # MacOS
    }

    os_is Linux &&
    {
        amixer -q -D pulse sset Master mute
    }
}

function unmute()
{
    os_is Darwin &&
    {
        osascript -e "set volume output volume $current_volume" # MacOS
    }

    os_is Linux &&
    {
        amixer -q -D pulse sset Master unmute
    }


}

# Init script vars
PROGRAM_NAME=$(basename $0)
DELAY_PERIOD=30
POSITIONAL=()

while [[ $# -gt 0 ]]
      do
          key="$1"

          case $key in
              -d|--delay)
                  DELAY_PERIOD="$2"
                  shift # past argument
                  shift # past value
                  ;;
              -h|--help)
                  usage; exit;
                  shift # past argument
                  shift # past value
                  ;;
              *)
                  POSITIONAL+=("$1")
                  shift # past argument
                  ;;
          esac
done

set -- "${POSITIONAL[@]}" # restore positional params

if [[ "$1" ]]; then
    DELAY_PERIOD=$1
fi

# Issue our mute command
mute

wait_period=0
while true
do
    wait_period=$(($wait_period+1))
    if [ $wait_period -gt $DELAY_PERIOD ]; then
        break
    else
        sleep 1
    fi
done

# Issue our unmute command
unmute