printVolCont - print ascii volume bar

printVolCont

#!/bin/bash

# printVolCont

# continuously print alsa or pulse master volume as ascii slider 
# to be used with tint2 executor (example at the bottom).

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

debug="false"
tooltip=false
channel=Master
chars="20"

# ─│� Ξ · ‖ ǁ ‖ • © ┼ × ┬ ┤├ ≠ ┴ ┬ ∈∋ ∊∍ ∞ ∅ ┉ ╋ ☼ ┯ ━ ◘ ◙ ○ ▓ ▮ ▒ ░ ǂ Ѫ Ж ф Ѳ ⑉ ⑄ ╵╷ ╴
begin="┌"
end="┐"
fil="─"
pos="┴" # will default to percentage
pos_mut="•"

# 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'm pulse
    mode=" Pulse" # Pulse

}

# alsa
alsa () {
    # -M: same as alsamixer, more human
    mapfile -t <<<$(amixer -M sget $channel)
    volPercents="${MAPFILE[$((${#MAPFILE[@]} - 1))]}"
    unset MAPFILE
    mute="${volPercents##*\[}"
    mute="${mute%%]*}"
    volPercents="${volPercents%%\%]*}"
    volPercents="${volPercents##*\[}"
    # i'm alsa
    mode="" # Alsa
}

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

[[ "$fil" == "" ]] && fil="-"

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

    #alsa || pulse # if alsa function errors, use pulse function
    alsaOrPulse
    
    if (( volPercents > 100 )); then
        volPercents=100
    fi
    if (( volPercents < 0 )); then
        volPercents=0
    fi

    # if mute
    if [ "$mute" == "off" ]; then
        [[ "$pos_mut" != "" ]] && posnow="$pos_mut" || posnow="M"
        tooltip="$channel Muted $volPercents%"
    else
        [[ "$pos" == "" ]] && posnow="$volPercents" || posnow="$pos"
        tooltip="Volume $channel $volPercents%"
    fi

    [ "$debug" = true ]  && printf "$posnow posnow\n$volPercents volPercents\n"

    preloop=$(( volPercents * chars / 100 ))
    [ "$debug" = true ]  && echo "$preloop preloop"

    # take width of current positional string into account, so that the bar's
    # width stays the same (at least with monospaced fonts)
    if (( preloop == chars )); then
        postloop=0
        preloop=$(( preloop - ${#posnow} ))
    elif (( preloop == 0 )); then
        postloop=$(( chars - ${#posnow} ))
    else
        postloop=$(( chars - preloop ))
        if (( postloop > preloop )); then
            postloop=$(( postloop - ${#posnow} / 2 - ${#posnow} % 2 ))
            preloop=$(( preloop - ${#posnow} / 2 ))
        else
            preloop=$(( preloop - ${#posnow} / 2 - ${#posnow} % 2 ))
            postloop=$(( postloop - ${#posnow} / 2 ))
        fi
    fi

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

    string=""
    for ((i=0;i<preloop;i++)); do
        string="$string$fil"
    done
    string="$string$posnow"
    for ((i=0;i<postloop;i++)); do
        string="$string$fil"
    done
    printf "%s%s%s%s\n" "$begin" "$string" "$end" "$mode"
    [[ "$tooltip" == "true" ]] && >&2 printf '\e[2J%s' "$tooltip"

done

# tint2 executor example:

#~ execp = new
#~ execp_centered = 1
#~ execp_has_icon = 0
#~ execp_command = printVolCont
#~ execp_continuous = 1
#~ execp_font = Misc Fixed Bold Semi-Condensed 10
#~ execp_font_color = #ffffff 55
#~ execp_padding = 4 0 0
#~ 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+