#!/bin/sh

# Requires: wireplumber (wpctl), and dunst or any notification daemon

# Volume control without a menu, for the media keys and the bar. One script

# does all four jobs; the vol-up/vol-down/vol-mute/vol-status symlinks beside

# it pick which, so a keybind is a bare path with no arguments. The action can

# also be given directly: `vol up`. The menu version is rofi-audio, which adds

# mic and output switching.

set -u

STEP=${VOL_STEP:-5}

# The same notification id rofi-audio uses, so a keypress and the menu replace

# each other's popup rather than stacking two of them.

NOTIFY_ID=7303

# @DEFAULT_AUDIO_SINK@ always resolves to whatever is current, so none of this

# needs to know which sink that is.

SINK=@DEFAULT_AUDIO_SINK@

# wpctl warns about rtkit on stderr under a plain X session; only stdout matters.

volume()  { wpctl get-volume "$SINK" 2>/dev/null; }

percent() { volume | awk '{ printf "%d", $2 * 100 }'; }

# Tracks the level the same way rofi-audio does, so a notification reads the

# same whether it came from a media key or from the menu.

icon() {

    case "$(volume)" in

        *MUTED*) printf '󰝟' ;;

        *) v=$(percent)

           if   [ "$v" -eq 0 ];  then printf '󰕿'

           elif [ "$v" -lt 34 ]; then printf '󰖀'

           else                       printf '󰕾'

           fi ;;

    esac

}

report() {

    msg="$(icon)  $(percent)%"

    # int:value draws dunst's progress bar; notify-send is the fallback for a

    # daemon that is not dunst.

    dunstify -r "$NOTIFY_ID" -h "int:value:$(percent)" "Volume" "$msg" 2>/dev/null ||

        notify-send "Volume" "$msg"

}

# The name it was called by (vol-up -> up), or the first argument if given.

action=${1:-$(printf '%s' "${0##*/}" | sed 's/^vol-*//')}

case "$action" in

    # -l 1.0 caps at 100%, so a held key cannot push the sink into clipping.

    up)     wpctl set-volume -l 1.0 "$SINK" "$STEP%+" 2>/dev/null; report ;;

    down)   wpctl set-volume "$SINK" "$STEP%-" 2>/dev/null;        report ;;

    mute)   wpctl set-mute "$SINK" toggle 2>/dev/null;             report ;;

    # Bar block: prints and exits, no notification.

    status) printf '%s  %s%%\n' "$(icon)" "$(percent)" ;;

    *) echo "usage: ${0##*/} [up|down|mute|status]" >&2; exit 2 ;;

esac