Re: callback function: options.dest is None and prevents updating parser.values

And so the drama for one ends :-) I was able to resolve my bug after a
good rest and some further digging into the optparse module. I chased
the bug through the module and it ran back into my callback function.

On 6/19/07, Joe Friedrichsen <[email protected]> wrote:
>
> I changed the -c, -p, and -a options to action=callback and
> callback=variable_args, and the parser broke again. When execution
> enters my callback function, option.dest is _always_ the same. The
> correct option is not being passed. How can I fix it?

By not using the same variable name for different things. I used (and
thereby re-set) the variable 'option' when finding the parser's
options. By changing the variable name used in the for loop to 'opt',
option.dest remained the correct destination.

Thanks for your patience,
Joe

The now bug-free code (with intelligent variable-length argument parsing):

    def variable_args(option, opt_str, value, parser):
        """Parse options that have a variable number of arguments

        """
        assert value is None
        value = []
        rargs = parser.rargs

        # Group all of the parser's options
        all_options = []
        for opt in parser.option_list:
            all_options = all_options + opt._short_opts + opt._long_opts

        while rargs:
            arg = rargs[0]

            # Stop if we hit an arg in the parser
            if arg in all_options:
                break
            else:
                value.append(arg)
                del rargs[0]

        setattr(parser.values, option.dest, value)

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