update-changelog.yml

name: Update Changelog

on:
  pull_request:
    branches:
      - develop
    types: [opened, synchronize, reopened]

jobs:
  update-changelog:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ github.event.pull_request.head.ref }}
      
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.x'

      - name: Update Changelog
        run: |
          LATEST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "0.0.0")
          echo "Latest tag: $LATEST_TAG"
          
          if ! grep -q "## \[Unreleased\]" CHANGELOG.md; then
            echo "No [Unreleased] section found"
            exit 0
          fi
          
          FIRST_VERSION=$(grep -oP "## \[\K[0-9]+\.[0-9]+\.[0-9]+" CHANGELOG.md | head -1 || echo "0.0.0")
          
          if [ "$LATEST_TAG" = "$FIRST_VERSION" ]; then
            echo "Latest tag matches first version in changelog"
            exit 0
          fi
          
          # Create temporary files
          echo -e "# Changelog\n\nAll notable changes to this project will be documented in this file.\n\nThe format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)\nand this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).\n\n## [Unreleased]\n\n### Added\n\n### Changed\n\n### Hardware\n" > header.tmp
          
          # Update the old unreleased section
          sed "0,/## \[Unreleased\]/s/## \[Unreleased\]/## [$LATEST_TAG]/" CHANGELOG.md | tail -n +7 > content.tmp
          
          # Combine files
          cat header.tmp content.tmp > CHANGELOG.md
          rm header.tmp content.tmp
          
          if git diff --quiet CHANGELOG.md; then
            echo "No changes to commit"
            exit 0
          fi
          
          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"
          git add CHANGELOG.md
          git commit -m "Update changelog for version $LATEST_TAG"
          git push