support check licences as pre-commit hook

[Niccolum]

[jmtatsch]

I tried to get this going:

https://github.com/jmtatsch/pip-licenses/blob/master/.pre-commit-hooks.yaml

and called from pre-commit like this:

-   repo: https://github.com/jmtatsch/pip-licenses
    rev: 0b6176619a8314c88e7817e3b51c59b1ffd4943a
    hooks:
    -   id: update-pip-licenses
        additional_dependencies: [prettytable]

However, the dependency prettytable doesn't seem to get installed correctly.

An unexpected error has occurred: CalledProcessError: command: ('/home/tatsch/.cache/pre-commit/repoijlcclt_/py_env-python3.10/bin/python', '-mpip', 'install', '.', 'prettytable')
return code: 1
stdout:
    Processing /home/tatsch/.cache/pre-commit/repoijlcclt_
      Preparing metadata (setup.py): started
      Preparing metadata (setup.py): finished with status 'error'
stderr:
      error: subprocess-exited-with-error
      
      × python setup.py egg_info did not run successfully.
      │ exit code: 1
      ╰─> [8 lines of output]
          Traceback (most recent call last):
            File "<string>", line 2, in <module>
            File "<pip-setuptools-caller>", line 34, in <module>
            File "/home/tatsch/.cache/pre-commit/repoijlcclt_/setup.py", line 34, in <module>
              from piplicenses import __author__ as AUTHOR
            File "/home/tatsch/.cache/pre-commit/repoijlcclt_/piplicenses.py", line 43, in <module>
              from prettytable import ALL as RULE_ALL
          ModuleNotFoundError: No module named 'prettytable'
          [end of output]
      
      note: This error originates from a subprocess, and is likely not a problem with pip.
    error: metadata-generation-failed
    
    × Encountered error while generating package metadata.
    ╰─> See above for output.
    
    note: This is an issue with the package mentioned above, not pip.
    hint: See above for details.
Check the log at /home/tatsch/.cache/pre-commit/pre-commit.log

Does anyone have an idea why this doesn't work?

[jmtatsch]

Ok, got a step further. It runs pip-licenses but produces an empty output file. Maybe because everything is running in a separated pre-commit environment?