vol

#!/bin/bash
# Control media volume from the command line.

mute() {
    pamixer --mute
}

unmute() {
    pamixer --unmute
}

is_muted() {
    pamixer --get-mute | grep -q true
}

get_default_sink() {
    pamixer --get-default-sink | tail -n+2
}

get_volume() {
    pamixer --get-volume
}

set_volume_safe() {
    pamixer --set-volume "$1" --set-limit 30
}

set_volume() {
    pamixer --set-volume "$1"
}

if ! command -v pamixer > /dev/null; then
    echo '"pamixer" not installed' # https://github.com/cdemoulins/pamixer
    exit 1
fi

RESET="\033[0m"
BOLD="\033[1m"
BLUE="\033[34m"
RED="\033[31m"
CYAN="\033[36m"

show_default_sink() {
    echo -e "${BOLD}Default sink: ${RESET}${BLUE}$(get_default_sink)${RESET}"
}

show_volume() {
    echo -ne "${BOLD}Volume: ${RESET}${CYAN}$(get_volume)%${RESET}"
    is_muted && echo -ne "${RED} (Muted)${RESET}"
    echo
}

# WIP
show_apps() {
    if ! command -v pactl > /dev/null; then
        echo 'Command "pactl" not found. You may need to install libpulse.'
        exit 1
    fi
    # shellcheck disable=SC2016
    awkprog='
    match($0, /^Sink Input #([0-9]+)/, m) {
        if (length(cur)) {
            printf("%s: %s%s (%s) | %s\n", cur, muted, appname, procname, medianame);
            cur = appname = procname = medianame = muted = "";
        }
        cur = m[1];
    }
    match($0, /^\s*application\.name = "(.*)"$/, m) { appname = m[1] }
    match($0, /\s*application\.process\.binary = "(.*)/, m) {procname = m[1]}
    match($0, /\s*media\.name = "(.*)"$/, m) {medianame = m[1]}
    match($0, /^\s*Mute: yes$/) {muted = "[Muted] "} 
    END {
        if (length(cur)) {
            printf("%s: %s%s (%s) | %s\n", cur, muted, appname, procname, medianame);
        }
    }'

    pactl list sink-inputs | gawk "$awkprog"
}

case $1 in
    m | mute)
        mute
        show_volume
        ;;
    u | um | unmute)
        unmute
        show_volume
        ;;
    [0-9] | [0-9][0-9] | 100)
        set_volume_safe "$1"
        show_volume
        ;;
    [0-9]! | [0-9][0-9]! | 100!)
        set_volume "${1%!}"
        show_volume
        ;;
    .)
        show_default_sink
        show_volume
        ;;
    a | app | apps)
        show_apps
        ;;
    *)
        echo "Usage: $0 <volume>[!]|m[ute]|u[nmute]|."
        ;;
esac