code: def _list_remote(store, maildir, verbose=False):
      
      # This command produces a list of all files in the maildir like:
      #   base-filename timestamp container-directory
      command = """echo {maildir}/{{cur,new}} | tr ' ' '\\n' | while read path ; do ls -1Ugo --time-style=+%s $path | sed -rne "s|[a-zA-Z-]+[ \t]+[0-9]+[ \t]+[0-9]+[ \t]+([0-9]+)[ \t]+([0-9]+\\.[A-Za-z0-9]+)(\\.([.A-Za-z0-9-]+))*(:[2],([PRSTDF]*))*|\\2 \\1 $path|p";done"""
      stdout = store.cmd(command, verbose)
      lines = stdout.split("\n")
      for line in lines:
          parts = line.split(" ")
          if len(parts) >= 3:
              yield parts[0:3]
docs: List the a maildir.
  
      store is an abstract representation of the source maildir. 
  
      maildir is the local maildir to which mail will be pulled.
  
      This is a generator for a reason. Because of the way ssh
      multi-mastering works a single open TCP connection allows multiple
      virtual ssh connections. So the encryption and tcp only has to be
      done once.
  
      If this command returned a list then the ssh list command would
      have finished and the ssh connection for each message would have
      to be made again.