@param cmdName: The name of the command we're generating completions for.
        In the case of zsh, this is used to print an appropriate
        "#compdef $CMD" line at the top of the output. This is
        not necessary for the functionality of the system, but it
        helps in debugging, since the output we produce is properly
        formed and may be saved in a file and used as a stand-alone
        completion function.

    @type words: C{list} of C{str}
    @param words: The raw command-line words passed to use by the shell
        stub function. argv[0] has already been stripped off.

    @type shellCompFile: C{file}
    @param shellCompFile: The file to write completion data to.
    é