Add the packaging infrastructure

.flake8

@@ -0,0 +1,16 @@
+# See:
+#
+# https://pycodestyle.readthedocs.io/en/latest/intro.html#error-codes  (E, W)
+# https://flake8.pycqa.org/en/latest/user/error-codes.html (F)
+# https://github.com/PyCQA/flake8-bugbear
+#
+# for error codes.  And
+#
+# https://flake8.pycqa.org/en/latest/user/violations.html#selecting-violations-with-flake8
+#
+# for error classes selected below.
+
+[flake8]
+max-line-length = 80
+select = C,E,F,W,B,B950
+ignore = E501, W503

.github/workflows/release.yml

@@ -0,0 +1,31 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - '*.*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Python 3.10
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.10'
+          architecture: 'x64'
+
+      - name: Install flit
+        run: pip install flit
+
+      - name: Build
+        run: flit build
+
+      - name: Publish to PyPI
+        env:
+          FLIT_USERNAME: __token__
+          FLIT_PASSWORD: ${{ secrets.PYPI_TOKEN }}
+        run: |
+          flit publish

.github/workflows/test.yml

@@ -0,0 +1,37 @@
+name: test
+
+on: [push, pull_request]
+
+jobs:
+  default:
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      matrix:
+        os: [ubuntu]
+        python-version: ["3.10"]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - uses: actions/cache@v2
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/pyproject.toml') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install ".[test]"
+
+    - name: Lint
+      run: pre-commit run --all-files --show-diff-on-failure --color always
+
+    - name: Test
+      run: |
+        pytest

.gitignore

@@ -1,2 +1,29 @@
 *~
+# Byte-compiled / optimized / DLL files
 **/__pycache__
+*.py[cod]
+
+# Distribution / packaging
+dist/
+
+# Unit test / coverage reports
+.pytest_cache/
+
+# General
+.DS_Store
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# IntelliJ project files
+.idea
+
+# Spyder project settings
+.spyderproject
+.spyproject

.pre-commit-config.yaml

@@ -0,0 +1,23 @@
+# Install pre-commit hooks via
+# pre-commit install
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.1.0
+    hooks:
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/psf/black
+    rev: 22.1.0
+    hooks:
+      - id: black
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.4
+    hooks:
+      - id: flake8
+        pass_filenames: true
+  - repo: https://github.com/pycqa/isort
+    rev: 5.10.1
+    hooks:
+      - id: isort

README.md

@@ -1,4 +1,6 @@
-`lazy_loader` makes it easy to load subpackages and functions on demand.
+![PyPI](https://img.shields.io/pypi/v/lazy-loader?style=for-the-badge)
+
+`lazy-loader` makes it easy to load subpackages and functions on demand.
 
 ## Motivation
 
@@ -7,6 +9,12 @@
 
 For a more detailed discussion, see [the SPEC](https://scientific-python.org/specs/spec-0001/).
 
+## Installation
+
+```
+pip install -U lazy-loader
+```
+
 ## Usage
 
 ### Lazily load subpackages
@@ -15,12 +23,12 @@ Consider the `__init__.py` from [scikit-image](https://scikit-image.org):
 
 ```python
 subpackages = [
-    ...
+    ...,
     'filters',
     ...
 ]
 
-from lazy_loader import lazy
+import lazy_loader as lazy
 __getattr__, __dir__, _ = lazy.attach(__name__, subpackages)
 ```
 

lazy_loader/__init__.py

@@ -1,3 +1,9 @@
+"""
+lazy_loader
+===========
+
+Makes it easy to load subpackages and functions on demand.
+"""
 import importlib
 import importlib.util
 import types

pyproject.toml

@@ -0,0 +1,31 @@
+[build-system]
+requires = ["flit_core >=3.3,<4"]
+build-backend = "flit_core.buildapi"
+
+[project]
+name = "lazy_loader"
+version = "0.1rc1"
+requires-python = ">=3.8"
+authors = [{name = "The Scientific Python Group"}]
+readme = "README.md"
+license = {file = "LICENSE.md"}
+classifiers = ["License :: OSI Approved :: BSD License"]
+dynamic = ["description"]
+
+[project.optional-dependencies]
+dev = [
+    "flit"
+]
+test = [
+    "pytest",
+    "black",
+    "pre-commit",
+    "flake8"
+]
+
+[project.urls]
+Home = "https://scientific-python.org/specs/spec-0001/"
+Source = "https://github.com/scientific-python/lazy-loader"
+
+[tool.flit.sdist]
+exclude = ["tests/*"]