refactor: switch from optparse to argparse #38
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| @@ -5,3 +5,7 @@ | |||
| """ | |||
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| from .cogapp import Cog as Cog, CogUsageError as CogUsageError, main as main | |||
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| if __name__ == "__main__": | |||
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This was here to enable calling the app as python -m cogapp <cli_args>. https://docs.python.org/3/library/__main__.html#idiomatic-usage
I used it while testing out the --help output and figured it would be useful to keep. I'm fine taking it out if you don't want it there though.
| @@ -801,6 +592,8 @@ def main(self, argv): | |||
| except CogError as err: | |||
| self.prerr(err) | |||
| return 1 | |||
| except SystemExit as exit: | |||
cogapp/options.py
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| if sys.version_info >= (3, 8): | ||
| from argparse import _ExtendAction |
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This seems odd to have to import or duplicate a private class from argparse. Isn't there a supported way to do what we need?
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The supported way to do it is by passing the string "extend", but that's only available starting in Python 3.8. I'll refactor to use the string in that case though.
cogapp/options.py
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| width=HELP_WIDTH, | ||
| ) | ||
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| def _split_lines(self, text, width): |
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Again we seem to be reaching into internal details. What is the advantage of using a supported module if we have to use unsupported interfaces in it?
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We don't have to necessarily. I wasn't thinking of it as problematic but you make a good point. It was purely for aesthetic reasons to add the blank line between option descriptions (which becomes more aesthetically pleasing once there are long options, e.g. see https://github.com/vergenzt/cog/blob/bd3cb2435419906c90ddd08febe8a7df7544260a/docs/running.rst).
I'll remove it though - it's probably not worth the hassle.
| getattr(ns, self.dest).update([arg]) | ||
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| class Markers(NamedTuple): |
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I'd rather avoid NamedTuple if we can, won't a dataclass work?
| @@ -1046,7 +1053,7 @@ def test_print_output(self): | |||
| make_files(d) | |||
| self.cog.callable_main(["argv0", "-rP", "test.cog"]) | |||
| self.assertFilesSame("test.cog", "test.out") | |||
| output = self.output.getvalue() | |||
| output, errput = self.capsys.readouterr() | |||
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throughout: if we aren't using errput, we should assign output, _ = ..., or we should make assertions about errput.
| _parser: ClassVar = CogArgumentParser( | ||
| prog="cog", | ||
| usage=argparse.SUPPRESS, | ||
| description=rewrap(description), |
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What happens if we don't use rewrap?
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Sorry gtg for now - will reply to remainder ASAP |
To consolidate options definitions into a single place, and use the more modern Python option parsing library.