From e5555a5d5b01113f82631556e78d6711d1826490 Mon Sep 17 00:00:00 2001
From: Sebastian Pipping <sebastian@pipping.org>
Date: Tue, 12 Dec 2023 18:46:24 +0100
Subject: [PATCH] pre-commit: Make CI keep keep the config up to date via pull
 requests

---
 .../workflows/pre-commit-detect-outdated.yml  | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 .github/workflows/pre-commit-detect-outdated.yml

diff --git a/.github/workflows/pre-commit-detect-outdated.yml b/.github/workflows/pre-commit-detect-outdated.yml
new file mode 100644
index 0000000..8b782d1
--- /dev/null
+++ b/.github/workflows/pre-commit-detect-outdated.yml
@@ -0,0 +1,62 @@
+# Copyright (c) 2023 Sebastian Pipping <sebastian@pipping.org>
+# Licensed under the MIT license
+
+name: Detect outdated pre-commit hooks
+
+on:
+  schedule:
+    - cron: '0 16 * * 5'  # Every Friday 4pm
+
+# NOTE: This will drop all permissions from GITHUB_TOKEN except metadata read,
+#       and then (re)add the ones listed below:
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  pre_commit_detect_outdated:
+    name: Detect outdated pre-commit hooks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python 3.12
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.12
+
+      - name: Install pre-commit
+        run: |-
+          pip install \
+            --disable-pip-version-check \
+            --no-warn-script-location \
+            --user \
+            pre-commit
+          echo "PATH=${HOME}/.local/bin:${PATH}" >> "${GITHUB_ENV}"
+
+      - name: Check for outdated hooks
+        run: |-
+          pre-commit autoupdate
+          git diff -- .pre-commit-config.yaml
+
+      - name: Create pull request from changes (if any)
+        id: create-pull-request
+        uses: peter-evans/create-pull-request@v5
+        with:
+          author: 'pre-commit <pre-commit@tools.invalid>'
+          base: master
+          body: |-
+            For your consideration.
+
+            :warning: Please **CLOSE AND RE-OPEN** this pull request so that [further workflow runs get triggered](https://github.com/peter-evans/create-pull-request/blob/main/docs/concepts-guidelines.md#triggering-further-workflow-runs) for this pull request.
+          branch: precommit-autoupdate
+          commit-message: "pre-commit: Autoupdate"
+          delete-branch: true
+          draft: true
+          labels: enhancement
+          title: "pre-commit: Autoupdate"
+
+      - name: Log pull request URL
+        if: "${{ steps.create-pull-request.outputs.pull-request-url }}"
+        run: |
+          echo "Pull request URL is: ${{ steps.create-pull-request.outputs.pull-request-url }}"