Add initial implementation

.editorconfig

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+root = true
+
+[*.py]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.flake8

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+[flake8]
+max-line-length = 88
+ignore = E203, W503
+exclude = .git,__pycache__,env,.venv,venv

.github/workflows/cd.yaml

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+name: "CD"
+
+on:
+  workflow_dispatch:
+    inputs:
+      release-type:
+        description: "Type of release?"
+        required: true
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
+
+jobs:
+  release:
+    name: "Release"
+    if: github.event.inputs.branch == 'main'
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.GH_PAT }}
+
+      - name: "Set up Python"
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.7"
+
+      - name: "Install Poetry"
+        uses: snok/install-poetry@5e4414407e59f94f2148bcb253917dfc22dee7d9 # v1.3.0
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      - name: "Add Poetry to PATH"
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: "Bump pyproject.toml version"
+        id: bump
+        run: |
+          poetry version ${{ github.event.inputs.release-type }}
+          echo "::set-output name=version::$(poetry version --short)"
+
+      - name: "Bump `git_vector.__version__`"
+        run: sed -i 's/^__version__ *=.*/__version__ = "${{ steps.bump.outputs.version }}"/' git_vector/__init__.py
+
+      - name: "Update the changelog"
+        # Find the first line that starts with `###` or `## [<number>` from the CHANGELOG and insert the new version header before it.
+        run: sed -i "0,/^\(###\|## *\[[0-9]\).*/{s//## [${{ steps.bump.outputs.version }}] - $(date -u '+%Y-%m-%d')\n\n&/}" CHANGELOG.md
+
+      - name: "Extract version's changelog for release notes"
+        # 1. Find the lines between the first `## [<number>` and the second `## [<number>`.
+        # 2. Remove all leading and trailing newlines from the output.
+        run: sed '1,/^## *\[[0-9]/d;/^## *\[[0-9]/Q' CHANGELOG.md | sed -e :a -e '/./,$!d;/^\n*$/{$d;N;};/\n$/ba' > release_notes.txt
+
+      - name: "Commit and tag the changes"
+        run: |
+          git config user.name 'github-actions'
+          git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
+          git add pyproject.toml git_vector/__init__.py CHANGELOG.md
+          git commit --message='Release ${{ steps.bump.outputs.version }}'
+          git tag --annotate --message='' v${{ steps.bump.outputs.version }}
+
+      - name: "Build the wheel"
+        run: poetry build
+
+      - name: "Publish to PyPI"
+        run: poetry publish
+        env:
+          POETRY_PYPI_TOKEN_PYPI: ${{ secrets.PYPI_TOKEN }}
+
+      - name: "Push the changes"
+        run: git push --follow-tags
+
+      - name: "Create a GitHub release"
+        uses: softprops/action-gh-release@1e07f4398721186383de40550babbdf2b84acfc5 # v1
+        with:
+          tag_name: v${{ steps.bump.outputs.version }}
+          name: v${{ steps.bump.outputs.version }}
+          body_path: release_notes.txt

.github/workflows/ci.yaml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  linters:
+    name: "Linters"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v2
+
+      - name: "Set up Python"
+        id: setup-python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.7"
+
+      - name: "Install Poetry"
+        uses: snok/install-poetry@5e4414407e59f94f2148bcb253917dfc22dee7d9 # v1.3.0
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      - name: "Add Poetry to PATH"
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: "Load cached venv"
+        id: cached-poetry-dependencies
+        uses: actions/cache@v2
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+
+      - name: "Install dependencies"
+        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+        run: poetry install --no-root
+
+      - name: "Run linters"
+        run: |
+          source "$VENV"
+          isort --check-only --diff . 
+          flake8 .
+          black --check --diff .
+
+  build:
+    name: "Build"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v2
+
+      - name: "Set up Python"
+        id: setup-python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.7"
+
+      - name: "Install Poetry"
+        uses: snok/install-poetry@5e4414407e59f94f2148bcb253917dfc22dee7d9 # v1.3.0
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      - name: "Add Poetry to PATH"
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: "Build the wheel"
+        run: poetry build
+
+      - name: "Install from the wheel"
+        run: pip install dist/*.whl
+
+  tests:
+    name: "Tests"
+    needs: [linters, build]
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    defaults:
+      run:
+        shell: bash
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@v2
+
+      - name: "Set up Python ${{ matrix.python-version }}"
+        id: setup-python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: "Install Poetry"
+        uses: snok/install-poetry@5e4414407e59f94f2148bcb253917dfc22dee7d9 # v1.3.0
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+
+      - name: "Add Poetry to PATH"
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: "Load cached venv"
+        id: cached-poetry-dependencies
+        uses: actions/cache@v2
+        with:
+          path: .venv
+          key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+
+      - name: "Install dependencies"
+        if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+        run: poetry install --no-root
+
+      - name: "Install the package"
+        run: poetry install
+
+      - name: "Run type-checking"
+        run: |
+          source "$VENV"
+          mypy .
+
+      - name: "Run tests"
+        run: |
+          source "$VENV"
+          pytest --verbose --cov=. --cov-report=xml .
+
+      - name: "Upload coverage"
+        if: matrix.python-version == '3.10' && matrix.os == 'ubuntu-latest'
+        uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b # v2.1.0
+        with:
+          files: coverage.xml