dvol

#!/bin/bash
#
# volume - dzen volume bar
#

interface=${3:-$(amixer scontrols|awk -F\' 'NR==1{print $2}')} # audio channel
card="${4:-0}"
secs="1"            # sleep $secs

xpos=$(xdotool getmouselocation|sed 's/:/ /g'|awk '{print $2}') # h position
ypos=$(xdotool getmouselocation|sed 's/:/ /g'|awk '{print $4}') # v position
height="40"         # window height
width="200"         # window width
dzen_bg="#151515"        # background colour of window
dzen_fg="#eeeeee"        # foreground colour of text/icon

bar_fg_muteon="#808080"    # foreground colour of volume bar
bar_fg_muteoff="#aa3333"    # foreground colour of volume bar
bar_bg="#090909"    # background colour of volume bar
bar_width="170"     # width of volume bar

#Probably do not customize
pipe="/tmp/dvolpipe"

err() {
  echo "$1"
  exit 1
}

usage() {
  echo "usage: dvol [option] [argument] [interface] [card]"
  echo
  echo "Options:"
  echo "     -i, --increase - increase volume by \`argument'"
  echo "     -d, --decrease - decrease volume by \`argument'"
  echo "     -t, --toggle   - toggle mute on and off"
  echo "     -h, --help     - display this"
  exit
}

#Argument Parsing
case "$1" in
  '-i'|'--increase')
    [ -z "$2" ] && err "No argument specified for increase."
    [ -n "$(tr -d [0-9] <<<$2)" ] && err "The argument needs to be an integer."
    amixarg="${2}%+"
    ;;
  '-d'|'--decrease')
    [ -z "$2" ] && err "No argument specified for decrease."
    [ -n "$(tr -d [0-9] <<<$2)" ] && err "The argument needs to be an integer."
    amixarg="${2}%-"
    ;;
  '-t'|'--toggle')
    amixarg="toggle"
    ;;
  ''|'-h'|'--help')
    usage
    ;;
  *)
    err "Unrecognized option \`$1', see dvol --help"
    ;;
esac

#Actual volume changing (readability low)
amixout="$(amixer set "$interface" "$amixarg" | tail -n 1)"
mute="$(awk -F"[][{}]" '{print $4}' <<<"$amixout")"
vol="$(awk -F '[][{}]|%' '{print $2}' <<<"$amixout")"

#Using named pipe to determine whether previous call still exists
#Also prevents multiple volume bar instances
if [ ! -e "$pipe" ]; then
  mkfifo "$pipe"
  (dzen2 -tw "$width" -h "$height" -x "$xpos" -y\
    "$ypos" -bg "$dzen_bg" -fg "$dzen_fg" < "$pipe"
   rm -f "$pipe") &
fi

#Feed the pipe!
bar_fg=bar_fg_mute$mute
bar_fg=${!bar_fg}
(echo "$vol" | gdbar -fg "$bar_fg" -bg "$bar_bg" -w "$bar_width"
 sleep "$secs") > "$pipe"