Update dependencies via CI cron

.github/workflows/update-dependencies.py

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+import os
+import re
+import urllib.request
+
+import atoma
+
+try:
+    from rich import print
+except ImportError:
+    pass
+
+DEFINITIONS_FILE = "winbuild/build_prepare.py"
+
+DEPENDENCIES = [
+    # Name, GitHub slug, version prefix
+    ("fribidi", "fribidi/fribidi", "v"),
+    ("harfbuzz", "harfbuzz/harfbuzz", ""),
+    ("openjpeg", "uclouvain/openjpeg", "v"),
+]
+
+
+def update_version(name: str, slug: str, version_prefix: str) -> str | None:
+    url = f"https://github.com/{slug}/tags.atom"
+    print(url)
+    contents = urllib.request.urlopen(url).read()
+    feed = atoma.parse_atom_bytes(contents)
+    link = feed.entries[0].links[0].href
+    print(link)
+    new_tag = link.rsplit("/", 1)[1]
+    print(f"{new_tag=}")
+    new_version = new_tag.removeprefix(version_prefix)
+    print(f"{new_version=}")
+
+    with open(DEFINITIONS_FILE) as f:
+        content = f.read()
+        content_new = re.sub(
+            rf"https://github.com/{slug}/archive/{version_prefix}\d+\.\d+\.\d+.zip",
+            f"https://github.com/{slug}/archive/{version_prefix}{new_version}.zip",
+            content,
+        )
+        content_new = re.sub(
+            rf"{name}-\d+\.\d+\.\d+",
+            rf"{name}-{new_version}",
+            content_new,
+        )
+    changes_made = content != content_new
+    print(f"{changes_made=}")
+    print()
+
+    if changes_made:
+        # Write the file out again
+        with open(DEFINITIONS_FILE, "w") as f:
+            f.write(content_new)
+        return f"{name} to {new_version}"
+
+    return None
+
+
+def main() -> None:
+    updates = []
+    for name, slug, v_in_tag in DEPENDENCIES:
+        update = update_version(name, slug, v_in_tag)
+        if update:
+            updates.append(update)
+
+    if updates:
+        commit_message = "Update " + ", ".join(updates)
+        print(commit_message)
+
+        github_env_file = os.getenv("GITHUB_ENV")
+        if github_env_file:
+            with open(github_env_file, "a") as f:
+                f.write(f"COMMIT_MESSAGE={commit_message}")
+    else:
+        print("No updates")
+
+
+if __name__ == "__main__":
+    main()

.github/workflows/update-dependencies.yml

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+name: "Update dependencies"
+
+on:
+  schedule:
+    - cron: "30 19 * * *" # daily at 19:30 UTC
+  push:
+    paths:
+      - ".github/workflows/update-dependencies.py"
+      - ".github/workflows/update-dependencies.yml"
+  pull_request:
+    paths:
+      - ".github/workflows/update-dependencies.py"
+      - ".github/workflows/update-dependencies.yml"
+  workflow_dispatch:
+
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  update_dependencies:
+    # TODO if: github.repository_owner == 'python-pillow'
+    name: Update dependencies
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v3
+        with:
+          python-version: "3.10"
+          cache: pip
+          cache-dependency-path: .github/workflows/update-dependencies.py
+
+      - name: "Check for updates"
+        run: |
+          python -m pip install atoma
+          python .github/workflows/update-dependencies.py
+
+      - name: "Check if there are changes"
+        id: "changes"
+        uses: UnicornGlobal/[email protected]
+
+        # behaviour if PR already exists: https://github.com/marketplace/actions/create-pull-request#action-behaviour
+      - name: "Create PR"
+        if: steps.changes.outputs.changed == 1
+        uses: "peter-evans/create-pull-request@v3"
+        with:
+          commit-message: >-
+            Update dependencies
+          title: ${{ env.COMMIT_MESSAGE }}
+          body: ""
+          labels: "Dependency"
+          branch: "update/dependencies"
+          delete-branch: true