Watch youtube live stream using streamlink, mpv & open popout chat in fish shell script

watchlive.fish

function watchlive --description 'Watch youtube live stream' --argument url mode
    set url (string match -r 'v=[^&]+' $url)
    google-chrome --new-window "--app=https://www.youtube.com/live_chat?is_popout=1&$url" &
    
    set prefix streamlink --retry-streams 5
    set suffix "https://www.youtube.com/watch?$url"
    
    if [ "$mode" = 'audio' ]
        # 144p & 240p: AAC-HEv2 2ch 48Khz 48Kbps
        # 360p & 480p: AAC-LC 2ch 48Khz 128Kbps
        # 720p & beyond: Max quality audio (up to 384k)
        $prefix -p 'mpv --no-video' $suffix worst
    else if set -q mode
        $prefix $suffix $mode
    else
        $prefix $suffix
    end
    
    # ending
    for window in (wmctrl -l | grep $url | cut -c -10)
        wmctrl -i -c $window
    end
end