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7884044
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2011-10-25T02:25:57.853
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2011-10-25T02:25:57.853
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In an attempt to solve this problem from the outside in - I have an initial implementation that patches the optparse module by replacing the OptionParser class with a subclass of OptionParser and overloads the parse_args method + exposes a new delayed_parse_args method. I'm sharing snippets from this solution in case anyone else finds its useful or can make an improvement to it. optparse_patch.py <pre><code>import optparse def patch_opt_parser(): optparse.stashed_parsers = {} class OptionParserEx(optparse.OptionParser): def delayed_parse_args(self, callback): optparse.stashed_parsers[self] = callback def parse_args(self, args=None, values=None): for parser, callback in getattr(optparse,"stashed_parsers").items(): # add all the option_list & option_groups from the individual # parsers in stashed_parsers to `self` for parser, callback in getattr(optparse,"stashed_parsers").items(): # update `parser` to inherit the option_lists and option_groups from # self. then .... _o, _a = optparse._OptionParser.parse_args( parser, args, values ) callback( _o, _a t) return getattr(optparse,"_OptionParser").parse_args(self, args, values) optparse._OptionParser = optparse.OptionParser optparse.OptionParser = OptionParserEx patch_opt_parser() </code></pre> This allows submodules to 'stash' their expected options and have the command line options evaluated at a later stage when the client of the module actually provides an OptionParser and calls the parse_args method on it's own OptionParser. An example of such a use case is as follows: module.py <pre><code>import optparse_patch import optparse parser = optparse.OptionParser() group = optparse.OptionGroup(parser, "module options") group.add_option("-f", dest="flip", action="store_true") parser.add_option_group(group) def cli_callback ( opts, args ): if opts.flip: print "flip" opts, args = parser.delayed_parse_args ( cli_callback ) </code></pre> main.py <pre><code>import module import optparse myparser = optparse.OptionParser() mygroup = optparse.OptionGroup(myparser, "main options") mygroup.add_option("-j", dest="jump", action="store_true") myparser.add_option_group(mygroup) opts, args = myparser.parse_args() if opts.jump: print "jump" </code></pre> calling the program main.py results in the following outputs: python main.py --help <pre><code>Usage: main.py [options] Options: -h, --help show this help message and exit module options: -f main options: -j </code></pre> python main.py -j -f <pre><code>flip jump </code></pre>
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