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Merge pull request #1175 from Kodiologist/argparse

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Add an example of using argparse with defmain
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Ryan Gonzalez 2016-12-13 11:29:42 -06:00 committed by GitHub
commit bc436d0fcd
1 changed files with 21 additions and 5 deletions
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docs/language/api.rst
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@ -624,7 +624,7 @@ is the equivalent of::
if __name__ == "__main__": if __name__ == "__main__":
import sys import sys
retval = main(*sys.arg) retval = main(*sys.argv)
if isinstance(retval, int): if isinstance(retval, int):
sys.exit(retval) sys.exit(retval)
@ -632,12 +632,28 @@ is the equivalent of::
Note that as you can see above, if you return an integer from this Note that as you can see above, if you return an integer from this
function, this will be used as the exit status for your script. function, this will be used as the exit status for your script.
(Python defaults to exit status 0 otherwise, which means everything's (Python defaults to exit status 0 otherwise, which means everything's
okay!) okay!) Since ``(sys.exit 0)`` is not run explicitly in the case of a
non-integer return from ``defmain``, it's a good idea to put ``(defmain)``
as the last piece of code in your file.
(Since ``(sys.exit 0)`` is not run explicitly in the case of a non-integer If you want fancy command-line arguments, you can use the standard Python
return from ``defmain``, it's a good idea to put ``(defmain)`` as the last module ``argparse`` in the usual way:
piece of code in your file.)
.. code-block:: clj
(import argparse)
(defmain [&rest _]
(setv parser (argparse.ArgumentParser))
(.add-argument parser "STRING"
:help "string to replicate")
(.add-argument parser "-n" :type int :default 3
:help "number of copies")
(setv args (parser.parse_args))
(print (* args.STRING args.n))
0)
.. _defmacro: .. _defmacro: