bin/nmixer

#!/usr/bin/env sh
#
# pbrisbin 2013 - amixer with notifications.
#
###
mixer() {
  local cmd="$1" level state icon message

  body="$(amixer sset Master "$cmd" |\
    sed '/.*Mono: Playback .* \[\(.*\)%\] .* \[\(on\|off\)\].*/!d; s//\1 \2/')"

  level="${body% *}"
  state="${body#* }"

  if [ "$state" = 'on' ]; then
    icon='audio-volume-low'
    message="Level: $level%"

    [ $level -gt 33 ] && icon='audio-volume-medium'
    [ $level -gt 66 ] && icon='audio-volume-high'
  else
    icon='audio-volume-muted'
    message="Muted"
  fi

  notify-send -t 1250 -i "$icon" 'Volume' "$message"
}

case "$1" in
  up)     mixer '3%+'   ;;
  down)   mixer '3%-'   ;;
  toggle) mixer 'toggle';;
  *)
    printf "usage: nmixer [up|down|toggle]\n" >&2
    exit 64
    ;;
esac