Add support for generators

[knixeur]

Due to the nature of Python trating a method as a generator when a yield
keyword is defined, it's hard to make this dynamic.
I ended up adding an additional parameter is_generator which needs to
be set to True when snooping a generator.

An additional decorator could be defined to make it easier, like @pysnooper.snoopgen which could call snoop with is_generator=True

Fixes #9

[cool-RR]

1. Use inspect.isgeneratorfunction to get rid of your generator argument.
2. The context manager should be held when doing next. i.e. tracing should be active only when the generator is running. So instead of a for loop, you need a while True loop that does next until a StopIteration is thrown. It should acquire the tracer on every next.

[knixeur]

1. I tried that, but since Python finds a yield statement it always returns a generator. Feel free to patch this PR and/or base a better one from this.
2. I'll do that, I was actually using yield from when I did these changes but it's not supported in Python 2.7.

Edit: Typo

[knixeur]

Sorry, I won't have time to finish this. I tried quickly to apply change 2 but it's giving me some headaches, I'll close this PR and if I have some time in the following weeks I'll give it another chance.

Edit: typo

[cool-RR]

I understand. Thanks for working on this!

…

On Tue, Apr 23, 2019, 19:58 Guillermo Bonvehí ***@***.***> wrote: Sorry, I won't have to finish this. I tried quickly to apply change 2 but it's giving me some headaches, I'll close this PR and if I have some time in the following weeks I'll give it another chance. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#31 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAN3SRVWGS5K74GKGUPO4DPR45ZHANCNFSM4HH2QSDA> .