#!/bin/bash

# printVolCont

# continuously print alsa or pulse 
# master volume as ascii slider ─────│───── ☐ Ξ  	· ‖ •
# to be used with tint2 executor (example at the bottom).

# needs: awk, bc, sed, grep, alsactl, amixer
# 2017/2018 by bronto, fixed by o9000

# license: WTFPL – Do What the **** You Want to Public License

# config
chars="50"
fil="·"
poschar="│"
posnum="true"   # show percent number instead of "$poschar" char
posmute=" ___ "

# debug
debug="false"

# checks
command -v awk >/dev/null 2>&1 || { echo "I need awk, exiting." >&2; exit 1; }
command -v bc >/dev/null 2>&1 || { echo "I need bc, exiting." >&2; exit 1; }
command -v sed >/dev/null 2>&1 || { echo "I need sed, exiting." >&2; exit 1; }
command -v alsactl >/dev/null 2>&1 || { echo "I need alsactl, exiting." >&2; exit 1; }
command -v amixer >/dev/null 2>&1 || { echo "I need amixer, exiting." >&2; exit 1; }

# pulse
# https://unix.stackexchange.com/questions/132230/read-out-pulseaudio-volume-from-commandline-i-want-pactl-get-sink-volume
pulse () {
    sink=$( pactl list short sinks | sed -e 's,^\([0-9][0-9]*\)[^0-9].*,\1,' | head -n 1 )
    volPercents=$( pactl list sinks | grep '^[[:space:]]Volume:' | head -n $(( sink + 1 )) | tail -n 1 | sed -e 's,.* \([0-9][0-9]*\)%.*,\1,' )
    
    # missing mute
    mute=$( pactl list sinks | grep 'Mute' | head -n $(( sink + 1 )) )
    
    # patch mute state to alsa (where 'off' equals 'Mute: yes')
    if [[ "$mute" = *"yes"* ]]; then
        mute="off"
    fi
    
    # i'am pulse
    mode=" Pulse" # Pulse

}

# alsa
alsa () {
    volPercents=$(awk -F"[^0-9]*" '/dB/ { print $3 }' <(amixer sget Master))
    volPercents=$(awk '{print $1; exit}' <(echo "$volPercents")) # just the first value
    mute=$(awk -F"[][]" '/dB/ { print $6 }' <(amixer sget Master))
    mute=$(awk '{print $1; exit}' <(echo "$mute")) # just the first value
    
    # i'am alsa
    mode="" # Alsa
}

# automagic
alsaOrPulse () {
    
    alsa
    
    if [[ -z "$volPercents" ]]; then
  
        pulse
  
            if [[ -z "$volPercents" ]]; then
                echo "error getting volume"
            fi
    fi
    
}

# main
(echo ""; stdbuf -oL alsactl monitor) |
while read
do
    # automagic
    alsaOrPulse
    
    if (( volPercents > 100 )); then
        volPercents=100
    fi
    
    if (( volPercents < 0 )); then
        volPercents=0
    fi
    
    if [ "$posnum" == "true" ]; then
        pos="$volPercents"
    else
        pos="$poschar"
    fi

    if [ "$mute" == "off" ]; then
        pos="$posmute"
    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" ;}


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

# tint2 executor example:

#execp = new
#execp_centered = 1
#execp_has_icon = 0
#execp_command = printVolCont
#execp_continuous = 1
#execp_font = cuprum 8
#execp_font_color = #111111 100
#execp_padding = 0 0 0
#execp_tooltip = volume
#execp_mclick_command = amixer set Master toggle
#execp_rclick_command = amixer set Master 5%+
#execp_lclick_command = amixer set Master 5%-
#execp_uwheel_command = amixer set Master 1%-
#execp_dwheel_command = amixer set Master 1%+