Download the current youtube page in the background

.vimperatorrc

" This gets added to your vimperatorrc; makes ':yt' trigger youtube-dl
" You can also bind it directly to a keystroke.
" Requires youtube-dl: https://github.com/rg3/youtube-dl
" On a Mac with Homebrew installed, you can 'brew install youtube-dl'
comm! yt 'exe "!" + eval("plugins.youtubeDownload.youtubeDownload()")'

youtubeDownload.js

// This goes in ~/.vimperator/plugin/youtubeDownload.js
function youtubeDownload() {
    if (!/youtube/.test(buffer.URL)) {
        return "echo Not a Youtube URL";
    }
    var cmd = "cd ~/Movies && youtube-dl -t ";
    var url = "'" + buffer.URL + "'";
    var cmd_string = cmd + url + " & ; open -g ~/Movies";
    return cmd_string;
};