Migrate CI from Travis to GitHub Actions

Replace the Travis config with a tests workflow on GitHub Actions:
style job (black + flake8 + pep8-naming) and a Python 3.10-3.14 test
matrix, with coverage uploaded via codecov-action. README badges
updated to point at the new workflow and the main branch.

Third-party actions are pinned by full commit SHA (with a `# vN.M.P`
comment noting the tag at pin time) for supply-chain hardening:
  - actions/checkout       v6.0.2
  - actions/setup-python   v6.2.0
  - codecov/codecov-action v6.0.1

The checkout step uses fetch-depth: 0 so the tests can run git blame
against historical SHAs in the repo's own history.

Also drops an unused `import glob` in contrib/main.py so flake8 passes.

Assisted-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: tgamblin

.github/workflows/tests.yml

@@ -0,0 +1,60 @@
+name: tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+# Third-party actions are pinned by full commit SHA (with a `# vN.M.P`
+# comment noting the tag at pin time) so that supply-chain attacks on the
+# action repos can't silently introduce new behavior. Dependabot/renovate
+# can bump these the same way it bumps any other dependency.
+
+jobs:
+  style:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: '3.12'
+      - name: Install style tools
+        run: |
+          python -m pip install --upgrade pip
+          pip install black flake8 pep8-naming
+      - name: black
+        run: black --diff --check .
+      - name: flake8
+        run: flake8
+
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          # Tests run `git blame` against historical SHAs in the repo's own
+          # history; the default shallow clone (fetch-depth: 1) breaks them.
+          fetch-depth: 0
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt coverage
+          pip install -e .
+      - name: Run tests
+        run: PYTHONPATH=. coverage run $(which pytest)
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@e79a6962e0d4c0c17b229090214935d2e33f8354  # v6.0.1
+        with:
+          flags: py${{ matrix.python-version }}
+          token: ${{ secrets.CODECOV_TOKEN }}
+        env:
+          OS: ${{ runner.os }}
+          PYTHON: ${{ matrix.python-version }}

.travis.yml

@@ -1,8 +1,8 @@
 # Contrib
 
 [![PyPI version](https://badge.fury.io/py/contrib.svg)](https://badge.fury.io/py/contrib)
-[![Build Status](https://travis-ci.com/spack/contrib.svg?branch=master)](https://travis-ci.com/spack/contrib)
-[![codecov](https://codecov.io/gh/spack/contrib/branch/master/graph/badge.svg)](https://codecov.io/gh/spack/contrib)
+[![tests](https://github.com/spack/contrib/actions/workflows/tests.yml/badge.svg?branch=main)](https://github.com/spack/contrib/actions/workflows/tests.yml)
+[![codecov](https://codecov.io/gh/spack/contrib/branch/main/graph/badge.svg)](https://codecov.io/gh/spack/contrib)
 [![Code Style: Black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 A python package for making stacked area plots of contributions to a git

README.md

@@ -9,7 +9,6 @@
 import bisect
 import collections
 import contextlib
-import glob
 import json
 import sys
 import re