#!/bin/bash
#######################################
## Graphical volume handler.
## Usage: vol [command|increment]
##   OPTIONS:
##     command     One of 'down' or 'up' or 'mute' or 'maximize'
##     increment   Adjust master volume by/to argument (like -10 or +25)
##   IF MUTED:     vol will un-mute with any argument, ignoring the argument
##   IF MAXIMIZED: vol will un-max with any argument, ignoring the argument
##   NO OPTION:    vol will show the current volume.  does nothing when muted.
## vol 0.1, (c) 2003 by Adam Katz <scripts@khopis.com>, consider the licence GPL
#######################################

# basic structure and core commands taken from:
# http://www.alobbs.com/modules.php?op=modload&name=News&file=article&sid=70
# as posted by Alvaro Lopez Orgega <alvaro@alobbs.com> 1/2003
# re-written 11/2003 by Adam Katz <scripts@khopis.com>

# INSTALL NOTES:
#  this script requires osd_cat and aumix!
#  ideally, you want a symlink to osd_cat called vol_meter
#  you can set it up on a dell laptop with:
#    i8kbuttons -u 'vol up' -d 'vol dn' -m 'vol mute'
#  the following variables should be all you need for tweaking:
#  this script is NOT meant to be installed in /usr/bin or /usr/local/bin.
#  it is designed to be used by an individual that the vol_meter can be in ~/bin

vol_meter=vol_meter  # should be a symlink to osd_cat
COLOR=green
FONT="-adobe-courier-bold-r-normal-*-*-180-*-*-m-*-iso8859-1"
X_OFFSET=10          # distance from left edge of screen
Y_OFFSET=53          # distance from top edge of screen
MUTED_FILE="/tmp/.vol_is_muted"
VOL_FACTOR=4         # fractions of 100 to represent volume
MAX_VOLUME=$((100/$VOL_FACTOR))  # don't change this, it's just math

# take first of the following from the $PATH, except this file
vol_meter=`which $vol_meter vol_meter osd_cat 2>/dev/null \
             |grep -v "$0$" |head -n1`
if [ -z "$vol_meter" ]; then
  echo "`basename $0`: You must have osd_cat (of xosd-bin) installed for this to work"
  exit 127
fi

vol_level ()
{
    aumix -q | grep vol | cut -f2 -d" " | cut -f1 -d","
}

get_vol ()
{
    vol=`vol_level`

    # if we are muted or maxed, report that and exit
    [ -s "$MUTED_FILE" ] && [ "$vol" = "0" ] && echo "MUTE" && exit 0
    [ -s "$MUTED_FILE" ] && [ "$vol" = "100" ] && echo "MAX VOL" && exit 0

    line=" Vol: ${vol}%  "

    vol=$(($vol/$VOL_FACTOR))

    for i in `seq $vol`; do
      line="$line|"
    done

    let rest=`expr $MAX_VOLUME - $vol`
    for i in `seq $rest`; do
      line="$line-"
    done

    echo "$line"
}

draw_line ()
{
  [ -s "$MUTED_FILE" ] && DELAY=40000000 || DELAY=2  # display for 1yr or 2sec

  killall -9 -q $vol_meter >/dev/null

  get_vol |$vol_meter -p top -A left -l1 -d$DELAY \
                      -i$X_OFFSET -o$Y_OFFSET \
                      -s1 -c "$COLOR" -f "$FONT" >/dev/null 2>&1 &
}


less_vol () 
{
    aumix -v -5 -w -5
}

more_vol ()
{
    aumix -v +5 -w +5
}

mute_vol ()
{
    if [ -s "$MUTED_FILE" ]
      
      then # un-mute
        aumix -f "$MUTED_FILE" -L >/dev/null         # restore settings
        rm -f "$MUTED_FILE"
        # caveat: if volume is modified elsewhere, we discard that blindly.

      else # mute
        aumix -f "$MUTED_FILE" -S                    # back up settings
        aumix -v0 -w0 -p0 -l0 -m0 -c0 -10 >/dev/null

    fi
}

max_vol ()
{
    if [ -s "$MUTED_FILE" ]
      then # un-max
        aumix -f "$MUTED_FILE" -L >/dev/null         # restore settings
        rm -f "$MUTED_FILE"
        # caveat: if volume is modified elsewhere, we discard that blindly.

      else # maximize (just master and wavetable)
        aumix -f "$MUTED_FILE" -S                    # back up settings
        aumix -v100 -w100 >/dev/null

    fi
}

#######
# main
#######

if `echo " $@" |grep -E ' --help| help' >/dev/null`
  then grep '^## ' `which $0 2>/dev/null || echo $0` |sed 's/^...//'
fi

if [ -s "$MUTED_FILE" ]
  then 
    [ $# -gt 0 ] && mute_vol # if an action is specified, unset mute/maximize
  else
    case "$1" in              # switch on what the action was
      down | dn | less | - )
        less_vol ;;
      up | more | + )
        more_vol ;;
      mute | off | toggle )
        mute_vol ;;
      max* | peak | full | all )
        max_vol ;;
      '' )
        ;; # no action: do nothing but display the volume
      * )
        aumix -v $@ ;;        # adjust the main volume by/to argument (eg -10)
    esac
fi


draw_line