Update Repo.config_reader to support user $HOME/.config/git/config

[jzempel]

Support for this second user-specific configuration file was added to git in v1.7.12. See commit comments and git documentation for details. Consider adding a "user" config_level to Repo.config_reader between "system" and "global".

[Byron]

You can see how this was implemented in this youtube video.

[jzempel]

@Byron thanks for the fix & the video. I think you're close. But it's not quite right.

Your code would be looking for either $XDG_CONFIG_HOME/.config/git/config or $HOME/.config/git/config. Per the git documentation, it should be $XDG_CONFIG_HOME/git/config.

Please see my Repo class override workaround for details: https://github.com/jzempel/continuity/blob/master/continuity/services/git.py#L38-L58

[Byron]

Thanks a bunch - you are totally right and I have basically put in the code in your override. Additionally I had a look at the c-git source and it is indeed implemented similarly.