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Add an example of using argparse with defmain

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Closes #1091.
This commit is contained in:
Kodi Arfer 2016-12-13 08:57:31 -08:00
parent 5b85990d87
commit 28b9874efd
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: