nix-config/pkgs/change-audio/change-audio

#!/usr/bin/env bash

set -euo pipefail

NOTIFY=(
    notify-send
    -u low
    -h string:x-canonical-private-synchronous:change-audio
)

do_change_volume() {
    local args=()

    if [ "$1" = "up" ]; then
        args+=("-i")
    else
        args+=("-d")
    fi
    shift

    # Do not boost over 100% unless explitily asked for
    if [ "$1" = "--force" ] || [ "$1" = "-f" ]; then
        args=("--allow-boost" "${args[@]}")
        shift
    fi

    # Volume
    args+=("$1")

    pamixer "${args[@]}"

    newVolume="$(pamixer --get-volume || true)"
    [ "$(pamixer --get-volume-human)" = "muted" ] && isMuted=true

    MSG="Set volume to $newVolume%"
    if [ "${isMuted:-false}" = true ]; then
        MSG="$MSG (muted)"
    fi
    "${NOTIFY[@]}" \
        -h "int:value:$newVolume" \
        -- "$MSG"
}

do_toggle() {
    local args=()
    if [ "${2:-audio}" = mic ]; then
        args+=(--default-source)
        MSG="Toggled microphone"
    else
        MSG="Toggled audio output"
    fi

    pamixer "${args[@]}" --toggle-mute

    if [ "$(pamixer "${args[@]}" --get-mute)" = true ]; then
        MSG="$MSG (muted)"
    else
        MSG="$MSG (unmuted)"
    fi

    "${NOTIFY[@]}" -- "$MSG"
}

case "$1" in
    up|down)
        do_change_volume "$@"
        ;;
    toggle)
        do_toggle "$@"
        ;;
    *)
        echo "No suche option '$1'" >&2
        exit 1
        ;;
esac