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.
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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