Add some pre-commit hooks

.flake8

@@ -0,0 +1,9 @@
+# Taken directly from https://github.com/ambv/black/blob/master/.flake8
+[flake8]
+ignore = E203, E266, E501, W503, C901, D104, D100
+max-line-length = 88
+max-complexity = 18
+select = B,C,E,F,W,T4,B9
+per-file-ignores =
+    tests/**:D101,D102,D103
+docstring-convention = numpy

.github/workflows/pre-commit.yml

@@ -0,0 +1,32 @@
+name: CI
+on: [push, pull_request]
+
+# Automatically stop old builds on the same branch/PR
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash -el {0}
+
+jobs:
+  pre-commit-checks:
+    name: "Linux - pre-commit checks - Python 3.10"
+    timeout-minutes: 30
+    runs-on: ubuntu-latest
+    env:
+      PRE_COMMIT_USE_MICROMAMBA: 1
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v3.5.2
+      - name: Set up micromamba
+        uses: mamba-org/setup-micromamba@875557da4ee020f18df03b8910a42203fbf02da1
+      - name: Add micromamba to GITHUB_PATH
+        run: echo "${HOME}/micromamba-bin" >> "$GITHUB_PATH"
+      - name: Install Python 3.10
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.10"
+      - name: Run pre-commit checks
+        uses: pre-commit/action@v3.0.0

.pre-commit-config.yaml

@@ -0,0 +1,35 @@
+repos:
+ - repo: https://github.com/Quantco/pre-commit-mirrors-black
+   rev: 23.7.0
+   hooks:
+     - id: black-conda
+       args:
+         - --safe
+         - --target-version=py38
+ - repo: https://github.com/Quantco/pre-commit-mirrors-flake8
+   rev: 6.1.0
+   hooks:
+    - id: flake8-conda
+ - repo: https://github.com/Quantco/pre-commit-mirrors-isort
+   rev: 5.12.0
+   hooks:
+    - id: isort-conda
+      additional_dependencies: [-c, conda-forge, toml=0.10.2]
+ - repo: https://github.com/Quantco/pre-commit-mirrors-mypy
+   rev: "1.5.1"
+   hooks:
+    - id: mypy-conda
+      additional_dependencies:
+        - -c
+        - conda-forge
+        - types-mock
+        - types-setuptools
+        - types-redis
+        - types-boto
+        - boto3-stubs
+ - repo: https://github.com/Quantco/pre-commit-mirrors-pyupgrade
+   rev: 3.10.1
+   hooks:
+    - id: pyupgrade-conda
+      args:
+        - --py38-plus

jupyter_vscode_proxy/__init__.py

@@ -1,7 +1,6 @@
-from typing import Callable, List, Dict, Any
-
 import os
 import shutil
+from typing import Any, Callable, Dict, List
 
 
 def _get_inner_vscode_cmd() -> List[str]:
@@ -30,14 +29,16 @@ def _get_inner_openvscode_cmd() -> List[str]:
 
 def _get_cmd_factory(executable: str) -> Callable:
     if executable not in _CODE_EXECUTABLE_INNER_CMD_MAP:
-        raise KeyError(f"'{executable}' is not one of {_CODE_EXECUTABLE_INNER_CMD_MAP.keys()}.")
-
+        raise KeyError(
+            f"'{executable}' is not one of {_CODE_EXECUTABLE_INNER_CMD_MAP.keys()}."
+        )
+
     get_inner_cmd = _CODE_EXECUTABLE_INNER_CMD_MAP[executable]
 
     def _get_cmd(port: int) -> List[str]:
         if not shutil.which(executable):
             raise FileNotFoundError(f"Can not find {executable} in PATH")
-        
+
         # Start vscode in CODE_WORKINGDIR env variable if set
         # If not, start in 'current directory', which is $REPO_DIR in mybinder
         # but /home/jovyan (or equivalent) in JupyterHubs

pyproject.toml

@@ -0,0 +1,23 @@
+[tool.black]
+exclude = '''
+/(
+    \.eggs
+  | \.git
+  | \.venv
+  | build
+  | dist
+)/
+'''
+
+[tool.isort]
+profile = "black"
+line_length = 88
+known_first_party = "{{ project_slug }}"
+skip_glob = '\.eggs/*,\.git/*,\.venv/*,build/*,dist/*'
+default_section = 'THIRDPARTY'
+
+[tool.mypy]
+python_version = '3.8'
+ignore_missing_imports = true
+no_implicit_optional = true
+check_untyped_defs = true

setup.py

@@ -1,6 +1,5 @@
 import setuptools
 
-
 with open("README.md", encoding="utf8") as f:
     readme = f.read()
 
@@ -17,11 +16,11 @@
     packages=setuptools.find_packages(),
     keywords=["Jupyter", "vscode", "vs code", "editor"],
     classifiers=["Framework :: Jupyter"],
-    install_requires=[
-        'jupyter-server-proxy'
-    ],
+    install_requires=["jupyter-server-proxy"],
     entry_points={
-        "jupyter_serverproxy_servers": ["vscode = jupyter_vscode_proxy:setup_vscode",]
+        "jupyter_serverproxy_servers": [
+            "vscode = jupyter_vscode_proxy:setup_vscode",
+        ]
     },
     package_data={"jupyter_vscode_proxy": ["icons/*"]},
     project_urls={