Option is lowercased upon decorating function

[ZenithDK]

pip list
Package Version

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...
click 6.7
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@click.command()
@click.option("--someOption", help="Help text")
def test_fun(someOption):
    print("Test print!")

if __name__ == "__main__":
    test_fun()

This will give an error:

Traceback (most recent call last):
  File "AutoGenerateVoicePromptPackage.py", line 9, in <module>
    test_fun()
  File "C:\Python27\lib\site-packages\click\core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "C:\Python27\lib\site-packages\click\core.py", line 697, in main
    rv = self.invoke(ctx)
  File "C:\Python27\lib\site-packages\click\core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "C:\Python27\lib\site-packages\click\core.py", line 535, in invoke
    return callback(*args, **kwargs)
TypeError: test_fun() got an unexpected keyword argument 'someoption'

As you can see, it expects the casing to be "someoption" - and not "someOption" as I specified it.
I'm running this on Windows 10 with Python 2.7.14 - could that be a factor?

[jcrotts]

I think this is expected behavior see this line in core.py I was able to replicate what you are seeing on MacOS on the current master branch of click.

What specifically are you trying to accomplish?

[ZenithDK]

This is wholly undocumented. I see the line of code and that is how I figured out it wasn't me that was causing the problem - but it is no documented.
Yes, all the examples use lowercase, but nowhere I can find does it say only lowercase is allowed (or that it is converted into lowercase).

I want camel casing of some of the arguments that I have - like "forceDeveloper" or "forceAll".
I would need to have all lowercase or "force-developer" (knowing it is converted to "force_developer" for instance).

[jcrotts]

I agree, it isn't explicitly documented, would you be interested in opening a documentation PR?

Also you can provide a token normalization function to allow case insensitive command line options.
See your modified example below:

import click
CONTEXT_SETTINGS = dict(token_normalize_func=lambda x: x.lower())
@click.command(context_settings=CONTEXT_SETTINGS)
@click.option("--someOption", help="Help text")
def test_fun(someoption):
    print("Test print!")

if __name__ == "__main__":
    test_fun()

This would make all of the following work:

$python test_fun.py --someOption someresponse"
$python test_fun.py --someoption someresponse"
$python test_fun.py --SOMEOPTION someresponse"

[ZenithDK]

#1055

[jcrotts]

Resolved in #1055