From 6a3a064554e0f680c29c57d5ad3c7e7cd038eef5 Mon Sep 17 00:00:00 2001
From: Kurt McKee <contactme@kurtmckee.org>
Date: Tue, 25 Jul 2023 05:46:38 -0500
Subject: [PATCH] build: reduce CI usage (#83)

* CI: Test multiple Pythons per OS

* Build a wheel once

* CI: Cache virtual environments
---
 .github/workflows/tests.yml | 44 ++++++++++++++++++++++++-------------
 requirements/dev.txt        |  3 ---
 requirements/tox.in         |  1 -
 requirements/tox.txt        |  3 ---
 tox.ini                     | 14 ++++--------
 5 files changed, 33 insertions(+), 32 deletions(-)

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 340b880..97a5cf1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -21,7 +21,7 @@ env:
 
 jobs:
   tests:
-    name: "${{ matrix.python-version }} on ${{ matrix.os }}"
+    name: "Test on ${{ matrix.os }}"
     runs-on: "${{ matrix.os }}-latest"
 
     strategy:
@@ -31,29 +31,43 @@ jobs:
           - ubuntu
           - macos
           - windows
-        python-version:
-          - "3.7"
-          - "3.8"
-          - "3.9"
-          - "3.10"
-          - "3.11"
-          - "pypy-3.9"
 
     steps:
       - name: "Check out the repo"
         uses: "actions/checkout@v3"
 
       - name: "Set up Python"
+        id: "setup-python"
         uses: "actions/setup-python@v4"
         with:
-          python-version: "${{ matrix.python-version }}"
-          cache: pip
-          cache-dependency-path: 'requirements/*.txt'
+          # The last listed Python version is the default.
+          python-version: |
+            pypy-3.9
+            3.7
+            3.8
+            3.9
+            3.10
+            3.11
+
+      - name: "Restore cache"
+        id: "restore-cache"
+        uses: "actions/cache@v3"
+        with:
+          path: |
+            .tox/
+            .venv/
+          key: "cache-python-${{ steps.setup-python.outputs.python-version }}-os-${{ runner.os }}-hash-${{ hashFiles('tox.ini', 'requirements/*.txt') }}"
+
+      - name: "Identify venv path"
+        shell: "bash"
+        run: "echo 'venv-path=${{ runner.os == 'Windows' && '.venv/Scripts' || '.venv/bin' }}' >> $GITHUB_ENV"
 
       - name: "Install dependencies"
+        if: "steps.restore-cache.outputs.cache-hit == false"
         run: |
-          python -m pip install -U setuptools
-          python -m pip install -r requirements/tox.txt
+          python -m venv .venv
+          ${{ env.venv-path }}/python -m pip install -U setuptools
+          ${{ env.venv-path }}/python -m pip install -r requirements/tox.txt
 
       - name: "Install pandoc on Linux"
         # sudo apt-get pandoc: will install a version from 2018!
@@ -72,9 +86,9 @@ jobs:
         run: |
           choco install -y -r --no-progress pandoc
 
-      - name: "Run tox for ${{ matrix.python-version }}"
+      - name: "Run tox"
         run: |
-          python -m tox
+          ${{ env.venv-path }}/python -m tox -m ci-tests
 
       - name: "Upload coverage data"
         uses: actions/upload-artifact@v3
diff --git a/requirements/dev.txt b/requirements/dev.txt
index c4395d3..ed22365 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -366,9 +366,6 @@ tomlkit==0.11.8
 tox==4.6.4
     # via
     #   -r requirements/tox.txt
-    #   tox-gh
-tox-gh==1.2.0
-    # via -r requirements/tox.txt
 twine==4.0.2
     # via -r requirements/quality.txt
 typed-ast==1.5.5
diff --git a/requirements/tox.in b/requirements/tox.in
index 0881b61..d07c121 100644
--- a/requirements/tox.in
+++ b/requirements/tox.in
@@ -2,4 +2,3 @@
 -c constraints.txt
 
 tox                       # Virtualenv management for tests
-tox-gh                    # Run tox environment based on the GitHub action matrix
diff --git a/requirements/tox.txt b/requirements/tox.txt
index 9305b73..22eb606 100644
--- a/requirements/tox.txt
+++ b/requirements/tox.txt
@@ -40,9 +40,6 @@ tomli==2.0.1
 tox==4.6.4
     # via
     #   -r requirements/tox.in
-    #   tox-gh
-tox-gh==1.2.0
-    # via -r requirements/tox.in
 typing-extensions==4.7.1
     # via
     #   importlib-metadata
diff --git a/tox.ini b/tox.ini
index 9ba98df..e65ff62 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,8 +6,12 @@ envlist =
     py3{7,11}-no_extras,
     # And the rest:
     pypy3, coverage, docs, quality
+labels =
+    ci-tests = py3{7,8,9,10,11},pypy3
 
 [testenv]
+package = wheel
+wheel_build_env = .pkg
 deps =
     -r{toxinidir}/requirements/test.txt
 extras =
@@ -61,13 +65,3 @@ commands =
 commands =
     python -m pip install -U pip
     make upgrade
-
-[gh]
-# https://pypi.org/project/tox-gh/
-python =
-    3.7 = py37, py37-no_extras
-    3.8 = py38
-    3.9 = py39
-    3.10 = py310
-    3.11 = py311, py311-no_extras
-    pypy3 = pypy3