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Restoring gitstats

gitstats tool has stopped working on our project after upgrade to Ubuntu 16.04. Finally I have got time to have a look. There were two issues with it:

  1. we do not need to use process wait as process communicate waits until process termination and the last process in the pipeline do not finish until all processes before it in the pipeline terminate, plus process wait may deadlock on pipes with huge output, see notice at https://docs.python.org/2/library/subprocess.html
  2. On Ubuntu 16.04 grep has started to give "Binary file (standard input) matches" notice into the pipe which breaks parsing.

I have made a pull request which fixes this issue: https://github.com/hoxu/gitstats/pull/65
Also you can clone fixed version from my account: https://github.com/Maxime2/gitstats

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