ci-auto-release.yml

name: Automated Release

on:
  schedule:
    - cron: "0 12 1 * *" # At 12:00 on day-of-month 1
  workflow_dispatch: 

jobs:
  build:
    runs-on: ubuntu-latest
    # Check if the event is not triggered by a fork
    # if: ${{ github.repository == 'p4lang/p4c' && github.ref == 'refs/heads/main' }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Fetch all history for all branches and tags
          fetch-depth: 0

      - name: Increment version number
        run: perl -i -pe 's/\b(\d+)(?=\D*$)/$1+1/e' Version.txt

      - name: Get changelog
        id: changelog
        run: |
          TAG="$(git describe --tags --abbrev=0)"
          GIT_LOG="$(git log $TAG..HEAD --oneline --pretty=format:"- %s [%an]")"
          CHANGELOG=$(cat << EOF
          Changelog:
          $GIT_LOG
          EOF
          )
          CHANGELOG="${CHANGELOG//'%'/'%25'}"
          CHANGELOG="${CHANGELOG//$'\n'/'%0A'}"
          CHANGELOG="${CHANGELOG//$'\r'/'%0D'}"
          CHANGELOG="${CHANGELOG//'#'/''}"
          echo "::set-output name=content::$CHANGELOG"

      - name: Display changelog
        run: echo "${{ steps.changelog.outputs.content }}"

      - name: Get version
        run: |
          VERSION="$(cat Version.txt)"
          echo "VERSION=$VERSION" >> $GITHUB_ENV

      - name: Update changelog.md
        run: |
          # Define the new changelog content
          NEW_CHANGELOG="## Version v${{ env.VERSION }}\n\n${{ steps.changelog.outputs.content }}\n"
          
          # Insert new changelog before the first release section
          awk -v new_changelog="$NEW_CHANGELOG" '/^## Release /{print new_changelog; new_changelog="";} 1' changelog.md > temp && mv temp changelog.md


      - name: Commit and push changelog
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add changelog.md Version.txt
          git commit -m "Update changelog and bump version to v${{ env.VERSION }}"
          git push origin main

      - name: Get commit message
        id: message
        run: |
          COMMIT_MSG=$(cat << EOF
          Release v${{ env.VERSION }}

          ${{ steps.changelog.outputs.content }}
          EOF
          )
          COMMIT_MSG="${COMMIT_MSG//'%'/'%25'}"
          COMMIT_MSG="${COMMIT_MSG//$'\n'/'%0A'}"
          COMMIT_MSG="${COMMIT_MSG//$'\r'/'%0D'}"
          echo "::set-output name=content::$COMMIT_MSG"

      - name: Get pull request body message
        id: body
        run: |
          MSG=$(cat << EOF
          Auto-generated pull request for version ${{ env.VERSION }}.

          Please use **Squash and merge** to include the changelog in the release message.

          ${{ steps.changelog.outputs.content }}
          EOF
          )
          MSG="${MSG//'%'/'%25'}"
          MSG="${MSG//$'\n'/'%0A'}"
          MSG="${MSG//$'\r'/'%0D'}"
          echo "::set-output name=content::$MSG"

      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v6
        with:
          base: main
          add-paths: Version.txt changelog.md
          reviewers: mbudiu-vmw
          commit-message: ${{ steps.message.outputs.content }}
          signoff: false
          branch: v${{ env.VERSION }}
          delete-branch: true
          title: Automated Release v${{ env.VERSION }}
          body: ${{ steps.body.outputs.content }}