gitignore only respects the root gitignore

[max-sixty]

Is your feature request related to a problem? Please describe.

This is fairly narrow, and would be understandable if it weren't worth fixing, but posting regardless.

Currently black only respects the root .gitignore to ignore files (#475). So a path like:

project
|-.gitignore <- doesn't contain .terraform
|-python-project
|-infra
  |-.gitignore # <- contains .terraform
  |-.terraform
    |-module.py

...will still format module.py

Describe the solution you'd like

Apply .gitignore rules like git does

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Thanks as ever for the superb library!

[hadialqattan]

Hi, I'm working on that, can anyone assign this issue to me?