Initial commit

.flake8

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+[flake8]
+max-line-length = 88
+ignore = E203,W503,W504

.github/workflows/lint.yml

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+name: Linting
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/lint.yml"
+      - ".pre-commit-config.yaml"
+      - "**.py"
+  push:
+    paths:
+      - ".github/workflows/lint.yml"
+      - ".pre-commit-config.yaml"
+      - "**.py"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: nox -s lint
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v4
+        name: Install Python
+        with:
+          python-version: "3.9"
+          cache: "pip"
+
+      - name: Run `nox -s lint`
+        run: pipx run nox --error-on-missing-interpreters -s lint -- --show-diff-on-failure
+
+  build:
+    name: Build sdist and wheel
+    runs-on: ubuntu-latest
+    # Linting verifies that the project is in an acceptable state to create files
+    # for releasing.
+    # And this action should be run whenever a release is ready to go public as
+    # the version number will be changed by editing __init__.py.
+    needs: lint
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build
+        run: pipx run build
+
+      - name: Archive files
+        uses: actions/upload-artifact@v3
+        with:
+          name: dist
+          path: dist

.github/workflows/test.yml

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+name: Test
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/test.yml"
+      - "**.py"
+  push:
+    paths:
+      - ".github/workflows/test.yml"
+      - "**.py"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: ${{ matrix.os }} / ${{ matrix.python_version }}
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [Ubuntu, Windows, macOS]
+        python_version:
+          ["3.7", "3.8", "3.9", "3.10", "3.11", "pypy3.7", "pypy3.8", "pypy3.9"]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-python@v4
+        name: Install Python ${{ matrix.python_version }}
+        with:
+          python-version: ${{ matrix.python_version }}
+          cache: "pip"
+
+      - name: Run nox
+        run: |
+          # Need to remove "-dev" suffix
+          INTERPRETER=${{ matrix.python_version }}
+          INTERPRETER=${INTERPRETER/-dev/}
+          pipx run nox --error-on-missing-interpreters -s tests-${INTERPRETER}
+        shell: bash

.gitignore

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+*.egg-info/
+*.egg
+*.py[co]
+
+.[nt]ox/
+.cache/
+.coverage
+.idea
+.venv*
+.vscode/
+
+.mypy_cache/
+.pytest_cache/
+__pycache__/
+_build/
+build/
+dist/
+htmlcov/

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.2.0
+    hooks:
+      - id: check-toml
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v0.950
+    hooks:
+      - id: mypy
+        exclude: '^(docs|tasks|tests)|setup\.py'
+        args: []
+        additional_dependencies: [pyparsing, nox]
+
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v2.32.0
+    hooks:
+      - id: pyupgrade
+        args: [--py36-plus]
+
+  - repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+      - id: black
+
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort
+
+  - repo: https://github.com/PyCQA/flake8
+    rev: "3.9.2"
+    hooks:
+      - id: flake8
+        additional_dependencies: ["pep8-naming"]
+        # Ignore all format-related checks as Black takes care of those.
+        args: ["--ignore", "E2,W5", "--select", "E,W,F,N"]

LICENSE

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+This software is made available under the terms of *either* of the licenses
+found in LICENSE.APACHE or LICENSE.BSD. Contributions to this software is made
+under the terms of *both* these licenses.

LICENSE.APACHE

@@ -0,0 +1,177 @@
+
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+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
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+   END OF TERMS AND CONDITIONS

LICENSE.BSD

@@ -0,0 +1,23 @@
+Copyright (c) Donald Stufft and individual contributors.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
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+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# Legacy Packaging
+
+This library provides support for "legacy" Python Packaging functionality
+removed from https://github.com/pypa/packaging.
+
+
+## Supported APIs
+
+This library includes support for the following deprecated/removed APIs:
+
+### `LegacyVersion`
+Removed in https://github.com/pypa/packaging/pull/407, this includes a
+`packaging_legacy.version.parse` function that handles legacy versions.
+
+```diff
+- from packaging.version import parse, LegacyVersion
++ from packaging_legacy.version import parse, LegacyVersion
+```