Black formatter not respecting pyproject.toml exclude

[Angry-Potato]

Environment data

• VS Code version: 1.37.1
• Extension version (available under the Extensions sidebar): 2019.8.30787
• OS and version: macOS Mojave 10.14.6
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.3
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): conda
• Relevant/affected Python packages and their versions: black==19.3b0
• Jedi or Language Server? (i.e. what is "python.jediEnabled" set to; more info How to update the language server to the latest stable version #3977): Jedi

Expected behaviour

On save, Black will not format files that are excluded by pyproject.toml.

Actual behaviour

Black formats files regardless.

Steps to reproduce:

1. Make a pyproject.toml file in your project, e.g.:

[tool.black]
exclude = '(\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist|.*\/models\.py.*|.*\/models\/.*)'

2. Create a models.py file, with a formatting problem:

# note space before print
 print("This line will be printed.")

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

> ~/anaconda2/envs/py_dev/bin/python -m black --config ~/work/example/pyproject.toml --diff --quiet ~/work/example/models.py.78c71eac353ea0a0b304502b320f3b03.py
cwd: ~/work/example
> ~/anaconda2/envs/py_dev/bin/python -m black --config ~/work/example/pyproject.toml --diff --quiet ~/work/example/models.py.78c71eac353ea0a0b304502b320f3b03.py
cwd: ~/work/example

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help; turn on source maps to make any tracebacks be useful by running Enable source map support for extension debugging)

> ~/anaconda2/envs/py_dev/bin/python -m black --config ~/work/example/pyproject.toml --diff --quiet ~/work/example/models.py.78c71eac353ea0a0b304502b320f3b03.py
cwd: ~/work/example
> ~/anaconda2/envs/py_dev/bin/python -m black --config ~/work/example/pyproject.toml --diff --quiet ~/work/example/models.py.78c71eac353ea0a0b304502b320f3b03.py
cwd: ~/work/example

[Angry-Potato]

could be solved by the outcome of psf/black#438

[karrtikr]

Closing as this is an issue of black upstream.