Update path handling to support Windows paths

[ntouran]

I am trying out this library on Windows and have gotten into a little trouble with paths. In doing a test-report:: directive and passing a unix-style relative path for :file:

.. test-report:: Unit Test Results
   :id: REPORT
   :file: ../project/unit-test-results/project-unit-test-results.xml

I'm seeing the following rendered out:

Test file: C:Usersusernamecodesprojectdoc../project/unit-test-results/unit-test-results.xml

Template used: C:Usersusernamecodesvenvsatom39libsite-packagessphinxcontribtest_reportsdirectives/test_report_template.txt

Statistics
Test suites: 0
...

A similar problem happens when I give a windows-style relative path for :file:, including:

• :file: ..\\..\\project\\unit-test-results\\project-unit-test-results.xml
• :file: ..\project\unit-test-results\project-unit-test-results.xml

If this used pathlib rather than os.path I believe it might work better? Are you interested in a PR along theses lines?

[danwos]

Thanks for reporting 👍
And sure, every PR is welcome, especially as I have no access to a windows machine to test it.

[ntouran]

Ok, PR #58 should work for both.