auto cd to a path, with file name
https://github.com/tenfyzhong/VimScripts
Also, you can download
https://github.com/tenfyzhong/VimScripts/blob/master/autoload/file.vim
to your autoload directory
CD\LCD: change to the argument directory, use cd\lcd command, which the argument is a directory,
or change to the parent path of a file argument. If without any
argument, it would use the current file as the argument.