cant pass None as argv about docopt

[keleshev]

from www.docopt.org:

argv is optional argument vector; by default it is the argument vector passed to your program (sys.argv[1:]). You can > supply it with list of strings (similar to sys.argv) e.g. ['--verbose', '-o', 'hai.txt'].

or you can pass a string, it will be .split()ed into list.

[RonnyPfannschmidt]

which means i cannot wrap docopt into a own function without jumping hops to deal with it

[keleshev]

In you case I recommend set argv='' or argv=[]:

def main(argv=[]):
    docopt(__doc__, argv=argv) 

[RonnyPfannschmidt]

my function is supposed to use sys.argv or the default, docopt is the first argument parser i tried that doesn't allow that by just passing on None

[keleshev]

Could you elaborate on that? docopt uses sys.argv by default if you don't pass anything.

[mikeboers]

I believe he would like to pass None to signal that docopt should use sys.argv.

[keleshev]

I never used a wrapper function for that—could either of you make an example? I'm consider changing this behavior.

[RonnyPfannschmidt]

i usually have a main function as application entrypoint that takes argv, but can be none
my current chunk of code i just half-changed to docopt is :

#!python
from . import cli
def main(argv=None, composer=None):
    args = docopt(cli.__doc__, argv=argv or sys.argv[1:])
    print args
    composer = composer or Composer(py.path.local(args['--path']))
    composer.run_actions(actions)
    #XXX ew
    args.func(args, composer)

[keleshev]

Is that for better testability of main?

I usually do:

"""Usage: ... """"
from docopt import docopt

main(args):
    code...

if __name__ == '__main__':
    try:
        main(docopt(__doc__))
    except KeyboardInterrupt:
        pass

[RonnyPfannschmidt]

its the entrypoint for a setuptools console script, and halfway for testability
i suppose i can shuffle it around a bit as needed

[keleshev]

How about:

def main(argv=sys.argv[1:], composer=None):
    ...

Or do you still think docopt should handle None?

[RonnyPfannschmidt]

i suffeled things around a bit to be like this:

#!pythonimport py
import sys
from couchdb_compose import cli
from couchdb_compose.composer import Composer, actions
from docopt import docopt

def doc_main(args, composer=None):
    print args
    composer = composer or Composer(py.path.local(args['--path']))
    composer.run_actions(actions)
    cli._dispatch(args, composer)

def main(argv=None, composer=None):
    if argv is None:
        argv = sys.argv[1:]
    args = docopt(cli.__doc__, argv=argv)
    return doc_main(args, composer)

if __name__ == '__main__':
    main()

[keleshev]

Looks good. Also the argv=argv or sys.argv[1:] trick.