On Feb 20, 2008, at 8:13 PM, Michael Hoffman wrote:
> Noah Gift wrote:
>> Has anyone created a command line tool, using optparse, that
>> dynamically creates options from available eggs/plugins? I have a
>> need to create such a tool, and was looking for an example.
>
Thanks Michael. That gives me some good ideas to start with!
> Yeah, I did something like this, which is somewhat clunky:
>
> def parse_options(args):
> usage = """%prog [OPTION...] MODEL SEQFILE OUTFILE
> %prog [OPTION...] --driver=DRIVER MODEL SEQFILE
> [DRIVEROPTIONS...]"""
> version = "%%prog %s" % __version__
> parser = OptionParser(usage=usage, version=version)
> parser.disable_interspersed_args()
>
>
> with OptionGroup(parser, "Output driver") as group:
> group.add_option("-d", "--driver", default="DEFAULT",
> help="set output format")
>
> group.add_option("--driver-help", action="store_true",
> help="get driver-specific help")
>
> options, args = parser.parse_args(args)
>
> if options.driver_help:
> driver_class = driver_load(options.driver)
> driver_class.print_help()
> sys.exit(0)
>
> def driver_load(name):
> return load_entry_point("myproject", "myproject.drivers", name)
>
> And I defined the entry points in my setup.py file:
>
> ====
> [myproject.drivers]
> DEFAULT = myproject.driver.hdf5:HDF5Driver
> hdf5 = myproject.driver.hdf5:HDF5Driver
> sql = myproject.driver.sql:SQLDriver
> ====
>
> At some point I pass unprocessed args to the entry point, which parse
> them with optparse. I could call the program like this:
>
> myproject --driver=sql model seqfile --database=server.example.net
>
> _______________________________________________
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Noah Gift / http://noahgift.com [Python+Grok+AJAX+Mashup]
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