#!/bin/bash

# printVolCont

# continuously print alsa master volume as ascii slider ─────│───── ☐ Ξ  	· ‖ •
# to be used with tint2 executor like:

    #execp_command = printVolCont
    #execp_continuous = 1

# awk, bc needed

# 2017 by bronto, fixed by o9000

(echo ""; stdbuf -oL alsactl monitor) |
while read
do
    debug="--true"

    volPercents=$(awk -F"[^0-9]*" '/dB/ { print $3 }' <(amixer sget Master))
    mute=$(awk -F"[][]" '/dB/ { print $6 }' <(amixer sget Master))

    if (( volPercents > 100 )); then
        volPercents=100
    fi
    if (( volPercents < 0 )); then
        volPercents=0
    fi

    chars="20"

    fil="─"
    pos="│"
    pos=" $volPercents " # Enable this to have a display like ─────50─────
    # if mute
    if [ "$mute" == "off" ]; then
        pos=" ___ "
    fi

    [ "$debug" = true ]  && { echo "$pos pos" ;}

    [ "$debug" = true ]  && { echo "$volPercents volPercents" ;}

    faktor=$(echo "scale=2;$chars/100" | bc)

    vol=$(echo "scale=0;($volPercents*$faktor+0.5)/1" | bc -l)

    [ "$debug" = true ]  && { echo "$vol vol" ;}

    postloop=$(echo "$chars-$vol" | bc)

    if (( vol == chars )); then
        postloop=0
    fi

    preloop=$(echo "$vol-1" | bc)

    if (( vol == 0 )); then
        preloop=0
        postloop=$(echo "$chars-$vol-1" | bc)
    fi

    [ "$debug" = true ]  && { echo "$preloop preloop" ;}
    [ "$debug" = true ]  && { echo "$postloop postloop" ;}


    for i in $(seq 1 $preloop); do
        printf "%s" "$fil" 
    done
        printf "%s" "$pos"
    for i in $(seq 1 $postloop); do
        printf "%s" "$fil"
    done
    printf "\n"
done