Basic lint definition and configuration.

Author: jeromekelleher

.github/workflows/lint.yml

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+name: lint
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  lint-c:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+    - name: install clang-format
+      run: |
+        sudo apt-get remove -y clang-6.0 libclang-common-6.0-dev libclang1-6.0 libllvm6.0
+        sudo apt-get autoremove
+        sudo apt-get install clang-format clang-format-6.0
+    - name: install run-clang-format
+      run: wget https://raw.githubusercontent.com/Sarcasm/run-clang-format/de6e8ca07d171a7f378d379ff252a00f2905e81d/run-clang-format.py
+    - name: clang-format
+      run: python run-clang-format.py --clang-format-executable=clang-format -r c/tskit c/tests
+  pre-commit:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions/setup-python@v1
+    - name: set PY
+      run: echo "::set-env name=PY::$(python -c 'import hashlib, sys;print(hashlib.sha256(sys.version.encode()+sys.executable.encode()).hexdigest())')"
+    - uses: actions/cache@v1
+      with:
+        path: ~/.cache/pre-commit
+        key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
+    - uses: pre-commit/[email protected]

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.5.0
+    hooks:
+      - id: check-merge-conflict
+      - id: debug-statements
+      - id: mixed-line-ending
+      - id: check-case-conflict
+      - id: check-yaml
+  - repo: https://github.com/psf/black
+    rev: 19.10b0
+    hooks:
+      - id: black
+        language_version: python3.6
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.7.9
+    hooks:
+      - id: flake8