Move synchronized directory.

def mv(source, target):
  ''' Move synchronized directory. '''

  if os.path.isfile(target) and len(source) == 1:
    if click.confirm("Are you sure you want to overwrite %s?" % target):

      err_msg = cli_syncthing_adapter.mv_edge_case(source, target)
      # Edge case: to match Bash 'mv' behavior and overwrite file

      if err_msg:
        click.echo(err_msg)

      return

  if len(source) > 1 and not os.path.isdir(target):
    click.echo(click.get_current_context().get_help())
    return

  else:
    err_msg, err = cli_syncthing_adapter.mv(source, target)

    if err_msg:
      click.echo(err_msg, err)