Automatically populate the changelog from GitHub PRs

Use the `gh` tool, as it’s available by default on GitHub actions.

Crawl the merged PRs, find those in the merge window (based on the
previous sprint number and date), list their title. When screenshots are
available in the PR, make a link to the pull request to facilitate
the demo.

.github/workflows/mkchangelog.yml

@@ -0,0 +1,20 @@
+name: 📃 Changelog
+
+on:
+ pull_request:
+ schedule:
+ - cron: 7 0 * * 0
+
+jobs:
+ generate-changelog:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/[email protected]
+ - name: 💂 Install Python
+ uses: actions/setup-python@v5
+ with:
+ python-version: "3.11"
+ - name: 📥 Generate changelog
+ run: scripts/mkchangelog
+ env:
+ GH_TOKEN: ${{ secrets.ITOU_TECH_GH_TOKEN }}

scripts/mkchangelog

@@ -0,0 +1,144 @@
+#!/usr/bin/env python3
+
+import datetime
+import json
+import logging
+import os
+import pathlib
+import re
+import subprocess
+import tempfile
+
+
+logger = logging.getLogger(__name__)
+
+
+def gh(*args, **kwargs):
+ return subprocess.run(
+ ["gh", *args],
+ check=True,
+ env={
+ "GH_TOKEN": os.getenv("GH_TOKEN", ""),
+ "PATH": os.environ["PATH"],
+ },
+ **kwargs,
+ )
+
+
+def list_merged_pull_requests():
+ logger.info("Reading pull requests from repository.")
+ result = gh(
+ "api",
+ "/repos/gip-inclusion/les-emplois/pulls?state=closed&sort=updated&direction=desc",
+ "--header",
+ "Accept: application/vnd.github+json",
+ "--header",
+ "X-GitHub-Api-Version: 2022-11-28",
+ "--paginate",
+ capture_output=True,
+ )
+ return result.stdout
+
+
+def open_pull_request(branch, title):
+ gh("pr", "create", "--label", "no-changelog", "--title", title, "--body", "")
+
+
+def main():
+ changelog_path = pathlib.Path("CHANGELOG.md")
+ with (
+ open(changelog_path, "r+") as changelog,
+ tempfile.NamedTemporaryFile(dir=os.getcwd(), mode="w+", suffix="~", delete=False) as new_changelog,
+ ):
+ try:
+ for line in changelog:
+ if line.strip() in ["# Journal des modifications", ""]:
+ new_changelog.write(line)
+ continue
+ break
+ last_entry_header = line
+
+ m = re.match(r"## \[(?P<sprint>[0-9]+)\] - (?P<date>[0-9]+-[0-9]+-[0-9]+)", last_entry_header)
+ sprint_number = int(m.group("sprint")) + 1
+ sprint_start = datetime.date.fromisoformat(m.group("date"))
+ sprint_end = sprint_start + datetime.timedelta(days=14)
+
+ merged_pull_requests = list_merged_pull_requests()
+ added, changed, removed = [], [], []
+ for pull_request in json.loads(merged_pull_requests):
+ updated_at = datetime.datetime.fromisoformat(pull_request["updated_at"])
+ if updated_at.date() < sprint_start:
+ break
+ merged_at = pull_request["merged_at"]
+ if merged_at is None:
+ # Closed pull request.
+ continue
+ merged_at = datetime.datetime.fromisoformat(merged_at)
+ labels = pull_request["labels"]
+ if sprint_start <= merged_at.date() < sprint_end and not any(
+ label["name"] in ["no-changelog", "dependencies"] for label in labels
+ ):
+ title = re.sub(r"\[(GEN|ITOU)-[0-9]+\]", "", pull_request["title"]).strip()
+ if re.search(r"\!\[[^]]+]", pull_request["body"]):
+ title = f"[{title}]({pull_request['html_url']})"
+ if any(label["name"] == "ajouté" for label in labels):
+ added.append(title)
+ elif any(label["name"] == "supprimé" for label in labels):
+ removed.append(title)
+ else:
+ changed.append(title)
+
+ if added or changed or removed:
+ new_changelog.write(f"## [{sprint_number}] - {sprint_end}\n\n")
+ if added:
+ new_changelog.write("### Ajouté\n\n")
+ for title in sorted(added):
+ new_changelog.write(f"- {title}\n")
+ new_changelog.write("\n")
+ if changed:
+ new_changelog.write("### Modifié\n\n")
+ for title in sorted(changed):
+ new_changelog.write(f"- {title}\n")
+ new_changelog.write("\n")
+ if removed:
+ new_changelog.write("### Supprimé\n\n")
+ for title in sorted(removed):
+ new_changelog.write(f"- {title}\n")
+ new_changelog.write("\n")
+
+ # Don’t forget the previous header.
+ new_changelog.write(last_entry_header)
+ for line in changelog:
+ new_changelog.write(line)
+
+ # Atomically replace file.
+ pathlib.Path(new_changelog.name).rename(changelog_path)
+ finally:
+ pathlib.Path(new_changelog.name).unlink(missing_ok=True)
+
+ branch = f"changelog/{sprint_end}"
+ title = f"changelog: Sprint {sprint_number}"
+ subprocess.run(["git", "switch", "--create", branch], check=True)
+ subprocess.run(
+ [
+ "git",
+ "-c",
+ "user.name=Changelog Bot",
+ "-c",
+ "[email protected]",
+ "commit",
+ "--all",
+ "--message",
+ title,
+ ],
+ check=True,
+ )
+ subprocess.run(["git", "push", "--set-upstream", "origin", "changelog/2024-04-22"], check=True)
+ open_pull_request(branch, title)
+
+
+if __name__ == "__main__":
+ if datetime.date.today().isocalendar().week % 2 == 0:
+ main()
+ else:
+ logger.info("Sprint in progress, nothing to do.")