Transformation of contrib/check_GNU_style.sh to a python script

[Tom de Vries]

On 05/19/2017 03:47 PM, Martin Liška wrote:
> +if __name__ == '__main__':
> +    if len(sys.argv) > 1:
> +        main()
> +    else:
> +        unittest.main()

Hi,

when specifying no arguments to the script, I see:
...
$ ./contrib/check_GNU_style.py
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK
...
In other words, the unit tests are run.

I was expecting some form of help message.


Attached patch splits off a lib file from the script. When running the 
lib file as a script, we run the unit tests. When running the script 
without args, we see:
...
$ ./contrib/check_GNU_style.py
usage: check_GNU_style.py [-h] [-f {stdio,quickfix}] file
check_GNU_style.py: error: the following arguments are required: file
...

OK?

Thanks,
- Tom
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