current_song

#!/usr/bin/env bash
version=7.1.0
music_player="auto"
#song_format="%artist% - %album% - %title%"
song_format="%artist% - %title%"
print_info() {
    info song
}
get_os() {
    # $kernel_name is set in a function called cache_uname and is
    # just the output of "uname -s".
    case $kernel_name in     
        Linux|GNU*)
            os=Linux
        ;;
        *BSD|DragonFly|Bitrig)
            os=BSD
        ;;
        *)
            printf '%s\n' "Unknown OS detected: '$kernel_name', aborting..." >&2
            printf '%s\n' "Open an issue on GitHub to add support for your OS." >&2
            exit 1
        ;;
    esac
}
get_song() {
    players=(
        "amarok"
        "audacious"
        "banshee"
        "bluemindo"
        "clementine"
        "cmus"
        "deadbeef"
        "deepin-music"
        "dragon"
        "elisa"
        "exaile"
        "gnome-music"
        "gmusicbrowser"
        "gogglesmm"
        "guayadeque"
        "io.elementary.music"
        "iTunes"
        "Music"
        "juk"
        "lollypop"
        "MellowPlayer"
        "mocp"
        "mopidy"
        "mpd"
        "muine"
        "netease-cloud-music"
        "olivia"
        "plasma-browser-integration"
        "playerctl"
        "chromium"
        "brave"
        "firefox"
        "ungoogled-chromium"
        "pogo"
        "pragha"
        "qmmp"
        "quodlibet"
        "rhythmbox"
        "sayonara"
        "smplayer"
        "spotify"
        "Spotify"
        "strawberry"
        "tauonmb"
        "tomahawk"
        "vlc"
        "xmms2d"
        "xnoise"
        "yarock"
    )

    printf -v players "|%s" "${players[@]}"
    player="$(ps aux | awk -v pattern="(${players:1})" \
        '!/ awk / && !/iTunesHelper/ && match($0,pattern){print substr($0,RSTART,RLENGTH); exit}')"

    [[ "$music_player" && "$music_player" != "auto" ]] && player="$music_player"

    get_song_dbus() {
        # Multiple players use an almost identical dbus command to get the information.
        # This function saves us using the same command throughout the function.
        song="$(\
            dbus-send --print-reply --dest=org.mpris.MediaPlayer2."${1}" /org/mpris/MediaPlayer2 \
            org.freedesktop.DBus.Properties.Get string:'org.mpris.MediaPlayer2.Player' \
            string:'Metadata' |\
            awk -F '"' 'BEGIN {RS=" entry"}; /"xesam:artist"/ {a = $4} /"xesam:album"/ {b = $4}
                        /"xesam:title"/ {t = $4} END {print a " \n" b " \n" t}'
        )"
    }

    case ${player/*\/} in
        "mocp"*)          song="$(mocp -Q '%artist \n%album \n%song')" ;;
        "deadbeef"*)      song="$(deadbeef --nowplaying-tf '%artist% \\n%album% \\n%title%')" ;;
        "qmmp"*)          song="$(qmmp --nowplaying '%p \n%a \n%t')" ;;
        "gnome-music"*)   get_song_dbus "GnomeMusic" ;;
        "lollypop"*)      get_song_dbus "Lollypop" ;;
        "clementine"*)    get_song_dbus "clementine" ;;
        "cmus"*)          get_song_dbus "cmus" ;;
        "juk"*)           get_song_dbus "juk" ;;
        "bluemindo"*)     get_song_dbus "Bluemindo" ;;
        "guayadeque"*)    get_song_dbus "guayadeque" ;;
        "yarock"*)        get_song_dbus "yarock" ;;
        "deepin-music"*)  get_song_dbus "DeepinMusic" ;;
        "tomahawk"*)      get_song_dbus "tomahawk" ;;
        "elisa"*)         get_song_dbus "elisa" ;;
        "sayonara"*)      get_song_dbus "sayonara" ;;
        "audacious"*)     get_song_dbus "audacious" ;;
        "vlc"*)           get_song_dbus "vlc" ;;
        "gmusicbrowser"*) get_song_dbus "gmusicbrowser" ;;
        "pragha"*)        get_song_dbus "pragha" ;;
        "amarok"*)        get_song_dbus "amarok" ;;
        "dragon"*)        get_song_dbus "dragonplayer" ;;
        "smplayer"*)      get_song_dbus "smplayer" ;;
        "rhythmbox"*)     get_song_dbus "rhythmbox" ;;
        "strawberry"*)    get_song_dbus "strawberry" ;;
        "gogglesmm"*)     get_song_dbus "gogglesmm" ;;
        "xnoise"*)        get_song_dbus "xnoise" ;;
        "tauonmb"*)       get_song_dbus "tauon" ;;
        "olivia"*)        get_song_dbus "olivia" ;;
        "exaile"*)        get_song_dbus "exaile" ;;
        "netease-cloud-music"*)        get_song_dbus "netease-cloud-music" ;;
        "plasma-browser-integration"*) get_song_dbus "plasma-browser-integration" ;;
        "io.elementary.music"*)        get_song_dbus "Music" ;;
        "MellowPlayer"*)  get_song_dbus "MellowPlayer3" ;;

        "mpd"* | "mopidy"*)
            song="$(mpc -f '%artist% \n%album% \n%title%' current "${mpc_args[@]}")"
        ;;

        "xmms2d"*)
            song="$(xmms2 current -f "\${artist}"$' \n'"\${album}"$' \n'"\${title}")"
        ;;

        "spotify"*)
            case $os in
                "Linux") get_song_dbus "spotify" ;;

                "Mac OS X"|"macOS")
                    song="$(osascript -e 'tell application "Spotify" to artist of current track as¬
                                          string & "\n" & album of current track as¬
                                          string & "\n" & name of current track as string')"
                ;;
            esac
        ;;

        "itunes"*)
            song="$(osascript -e 'tell application "iTunes" to artist of current track as¬
                                  string & "\n" & album of current track as¬
                                  string & "\n" & name of current track as string')"
        ;;

        "music"*)
            song="$(osascript -e 'tell application "Music" to artist of current track as¬
                                  string & "\n" & album of current track as¬
                                  string & "\n" & name of current track as string')"
        ;;

        "banshee"*)
            song="$(banshee --query-artist --query-album --query-title |\
                    awk -F':' '/^artist/ {a=$2} /^album/ {b=$2} /^title/ {t=$2}
                               END {print a " \n" b " \n"t}')"
        ;;

        "muine"*)
            song="$(dbus-send --print-reply --dest=org.gnome.Muine /org/gnome/Muine/Player \
                    org.gnome.Muine.Player.GetCurrentSong |
                    awk -F':' '/^artist/ {a=$2} /^album/ {b=$2} /^title/ {t=$2}
                               END {print a " \n" b " \n" t}')"
        ;;

        "quodlibet"*)
            song="$(dbus-send --print-reply --dest=net.sacredchao.QuodLibet \
                    /net/sacredchao/QuodLibet net.sacredchao.QuodLibet.CurrentSong |\
                    awk -F'"' 'BEGIN {RS=" entry"}; /"artist"/ {a=$4} /"album"/ {b=$4}
                    /"title"/ {t=$4} END {print a " \n" b " \n" t}')"
        ;;

        "pogo"*)
            song="$(dbus-send --print-reply --dest=org.mpris.pogo /Player \
                    org.freedesktop.MediaPlayer.GetMetadata |
                    awk -F'"' 'BEGIN {RS=" entry"}; /"artist"/ {a=$4} /"album"/ {b=$4}
                    /"title"/ {t=$4} END {print a " \n" b " \n" t}')"
        ;;

        "playerctl"*)
            song="$(playerctl metadata --format '{{ artist }} \n{{ album }} \n{{ title }}')"
        ;;
        
        "firefox"*)
            song="$(playerctl metadata --format '{{ artist }} \n{{ album }} \n{{ title }}')"
        ;;

        "brave"*)
            song="$(playerctl metadata --format '{{ artist }} \n{{ album }} \n{{ title }}')"
        ;;

        "ungoogled-chromium"*)
            song="$(playerctl metadata --format '{{ artist }} \n{{ album }} \n{{ title }}')"
        ;;

        "chromium"*)
            song="$(playerctl metadata --format '{{ artist }} \n{{ album }} \n{{ title }}')"

        ;;
        *) mpc &>/dev/null && song="$(mpc -f '%artist% \n%album% \n%title%' current)" || return ;;
    esac

    IFS=$'\n' read -d "" -r artist album title <<< "${song//'\n'/$'\n'}"

    # Make sure empty tags are truly empty.
    artist="$(trim "$artist")"
    album="$(trim "$album")"
    title="$(trim "$title")"

    # Set default values if no tags were found.
    : "${artist:=Unknown Artist}" "${album:=Unknown Album}" "${title:=Unknown Song}"

	# Don't print if unknown
	if [[ "$artist" == "Unknown Artist" && "$album" == "Unknown Album" && "$title" == "Unknown Song" ]]; then
		return
	fi
    # Display Artist, Album and Title on separate lines.
    if [[ "$song_shorthand" == "on" ]]; then
        prin "Artist" "$artist"
        prin "Album"  "$album"
        prin "Song"   "$title"
    else
        song="${song_format/\%artist\%/$artist}"
        song="${song/\%album\%/$album}"
        song="${song/\%title\%/$title}"
    fi
}

# TEXT FORMATTING

info() {
    # Save subtitle value.
    [[ "$2" ]] && subtitle="$1"

    # Make sure that $prin is unset.
    unset -v prin

    # Call the function.
    "get_${2:-$1}"

    # If the get_func function called 'prin' directly, stop here.
    [[ "$prin" ]] && return

    # Update the variable.
    if [[ "$2" ]]; then
        output="$(trim "${!2}")"
    else
        output="$(trim "${!1}")"
    fi

    if [[ "$2" && "${output// }" ]]; then
        prin "$1" "$output"

    elif [[ "${output// }" ]]; then
        prin "$output"

    fi

    unset -v subtitle
}

prin() {
    # If $2 doesn't exist we format $1 as info.
    if [[ "$(trim "$1")" && "$2" ]]; then
        [[ "$json" ]] && { printf '    %s\n' "\"${1}\": \"${2}\","; return; }

        string="${1}${2:+: $2}"
    else
        string="${2:-$1}"
        local subtitle_color="$info_color"
    fi

    string="$(trim "${string//$'\e[0m'}")"
    length="${#length}"

    # Format the output.
    string="${string/:/${reset}${colon_color}${separator:=:}${info_color}}"
    string="${subtitle_color}${bold}${string}"

    # Print the info.
    printf '%b\n' "${text_padding:+\e[${text_padding}C}${zws}${string//\\n}${reset} "

    # Calculate info height.
    ((++info_height))

    # Log that prin was used.
    prin=1
}

trim() {
    set -f
    # shellcheck disable=2048,2086
    set -- $*
    printf '%s\n' "${*//[[:space:]]/}"
    set +f
}

cache_uname() {
    # Cache the output of uname so we don't
    # have to spawn it multiple times.
    IFS=" " read -ra uname <<< "$(uname -srm)"

    kernel_name="${uname[0]}"
    kernel_version="${uname[1]}"
    kernel_machine="${uname[2]}"

    if [[ "$kernel_name" == "Darwin" ]]; then
        IFS=$'\n' read -d "" -ra sw_vers <<< "$(awk -F'<|>' '/key|string/ {print $3}' \
                            "/System/Library/CoreServices/SystemVersion.plist")"
        for ((i=0;i<${#sw_vers[@]};i+=2)) {
            case ${sw_vers[i]} in
                ProductName)          darwin_name=${sw_vers[i+1]} ;;
                ProductVersion)       osx_version=${sw_vers[i+1]} ;;
                ProductBuildVersion)  osx_build=${sw_vers[i+1]}   ;;
            esac
        }
    fi
}

main() {
    cache_uname
    get_os
    print_info

    return 0
}
main "$@"