Incorrect handling of backslashes in Git configuration

[ereOn]

Steps to reproduce the issue:

import git
config = git.Repo().config_writer()
config.add_section('test')
config.set_value('test', 'test', r'some\data')

Now if you try to read this value using a regular (non Python) git config, Git complains that the configuration file is invalid:

fatal: bad config file line 11 in .git/config

Indeed, if you open .git/config you can see that the value is written as:

[test]
  test = some\data

While the git-config configuration states that:

String values may be entirely or partially enclosed in double quotes. You need to enclose variable values in double quotes if you want to preserve leading or trailing whitespace, or if the variable value contains comment characters (i.e. it contains # or ;). Double quote " and backslash \ characters in variable values must be escaped: use " for " and \ for .

That is, the backslashes are not escaped in the configuration file.

This also causes issues while reading, because values are not un-escaped.

I provided a sample fixing commit: changes are simple but I couldn't test it (I have no access to any Python installation right now and did the change online).

[ereOn]

Note: Don't pull the changes !

I couldn't test it but remembered too late that r'\' is not valid and should be '\\'.

Tell me if you want me to provide a full valid (and obviously tested) pull-request.

[Byron]

Thanks for digging into this - your report is thorough and very detailed.
Mistakes happen, and if you would amend the test-cases as well, I will be happy to merge it.

Thanks,
Sebastian

[ereOn]

You are welcome.

I will provide a complete pull-request, including a modification of the test-cases, this evening or by tomorrow. (if I am given the time to do so).

Thank you for this great library :)