Add directory context

[jan-janssen]

Based on pyiron/pyiron_base#1916

[github-actions]

👈 Launch a binder notebook on branch pyiron/pyiron_snippets/directory_context

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.43%. Comparing base (01ef150) to head (9f5eab1).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   95.34%   95.43%   +0.08%     
==========================================
  Files          15       16       +1     
  Lines         602      613      +11     
==========================================
+ Hits          574      585      +11     
  Misses         28       28              

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[liamhuber]

Code looks good.

I would prefer but do not insist on a more specific module name, e.g. with_directory/directory_context/cwdcontext/whatever. The spirit of the project is that different pieces are independent of each other, but this will lead to multiple context managers in the same file. In particular this may cause confusion since the exception context manager is already in a separate file.

Please add documentation. IMO the one-sentence header in the docstring is perfect, but please add a code example, e.g. by taking the unit test and adding two print statements (inside and after the context). The header and code example from the docstring should then be added to the readme (which is sorted alphabetically by module name)

[liamhuber]

I directly copy-pasted the example into the README in #72; IMO the existing doc works perfectly there, but feel free to modify it further if you'd like. Once it's mentioned in the readme I'm 100% happy, so I'm going to pre-approve here.