build_event_prep.yml

name: Generate Release Content

on:
  pull_request:
    branches:
      - main

jobs:
  label:
    runs-on: ubuntu-latest
    outputs:
      release-type: ${{ steps.parse-labels.outputs.release-type }}
      change-type: ${{ steps.parse-labels.outputs.change-type }}
      previous-version: ${{ steps.prevtag.outputs.previousversion }}
      release-version: ${{ steps.new-version-standard.outputs.new-version }}
      changelog-content: ${{ steps.set-changelog.outputs.changelog }}
    permissions:
      issues: write
      pull-requests: write
      contents: read
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
      with: 
        path: src
        fetch-depth: 0
    - name: Parse and Add Labels
      id: parse-labels
      uses: actions/github-script@v7
      with:
        script: |
          const script = require('./src/.github/scripts/pr-scripts/parse-add-labels.js')
          await script({github, context, core})

    - name: Detect previous version number
      id: prevtag
      working-directory: src
      run: |
        if previousversion=$(git describe --tags --match="[0-9]*" --abbrev=0 HEAD 2>/dev/null); then
          echo "previousversion=$(git describe --tags --match="[0-9]*" --abbrev=0 HEAD)" >> "$GITHUB_OUTPUT"
        else
          echo "previousversion=0.0.0" >> "$GITHUB_OUTPUT"
        fi

    - name: Determine new version number (Standard)
      uses: actions/github-script@v7
      id: new-version-standard
      env:
        PREV_VERSION: ${{ steps.prevtag.outputs.previousversion }}
        RELEASE_TYPE: ${{ steps.parse-labels.outputs.release-type }}
      with:
        script: |
          const script = require('./src/.github/scripts/pr-scripts/plan_new-version.js')
          await script({github, context, core})
    - name: Extract changelog entry
      uses: actions/github-script@v7
      id: set-changelog
      env: 
        releaseversion: ${{ steps.new-version-standard.outputs.new-version }}
        changetype: ${{ steps.parse-labels.outputs.change-type }}
      with:
        script: |
          const script = require('./src/.github/scripts/pr-scripts/plan_changelog.js')
          await script({github, context, core})
  comment:
    needs: label
    if: needs.label.outputs.release-type != 'no-release'
    permissions:
      issues: write
      pull-requests: write
      contents: read
    runs-on: ubuntu-latest
    name: 'Comment on PR'
    steps:
      - name: Clone Repo to determine previous git tag
        uses: actions/checkout@v4
        with:
          path: src
          fetch-depth: 0
      - uses: actions/github-script@v7
        env:
          releaseVersion: '${{ needs.label.outputs.release-version }}'
          previousVersion: '${{ needs.label.outputs.previous-version }}'
          changelogContent: '${{ needs.label.outputs.changelog-content }}'
        with:
          script: |
            const script = require('./src/.github/scripts/pr-scripts/comment_pr-comment.js')
            await script({github, context, core})
  update-files:
    needs: label
    permissions:
      issues: write
      pull-requests: write
      contents: write
    runs-on: ubuntu-latest
    name: 'Update release files.'
    steps:  
      - name: "Checkout Repository"
        uses: actions/checkout@v4
        with:
          path: src
          fetch-depth: 0
          ref: 'main'
      - name: Fetch Release Notes
        id: fetch-release-notes
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const path = require('path');
            const readFile = (filePath) => fs.readFileSync(filePath, 'utf-8').trim();

            const changelogPath = 'src/CHANGELOG.md';
            const changelogContent = readFile(changelogPath);

            core.setOutput('existing-changelog', changelogContent);
      - name: Prepend New Changelog Content
        id: prepend-changelog
        run: |
          mkdir -p tmp && cd tmp
          echo "# Changelog" > updated-changelog.md
          echo "" >> updated-changelog.md
          printf "${{ needs.label.outputs.changelog-content }}" >> updated-changelog.md
          printf "${{ steps.fetch-release-notes.outputs.existing-changelog }}" | sed '1d' >> updated-changelog.md
      - name: Generate Readme Content
        working-directory: src
        run: |
          npm install js-yaml --save
          node .github/scripts/generate-readme.js
      - name: Checkout Pull Request Branch Again
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.ref }}
          fetch-depth: 0
          path: src
      - name: Update package.json with version
        working-directory: src
        run: | 
          sed -i 's/"version": "[^"]*"/"version": "${{ needs.label.outputs.release-version }}"/' package.json
      - name: Commit and Push Updates
        working-directory: src
        run: |
          git config user.name "GitHub-Actions[bot]"
          git config user.email "GitHub-Actions[bot]@users.noreply.github.com"
          cp ${{ github.workspace }}/tmp/updated-changelog.md CHANGELOG.md
          cp ${{ github.workspace }}/tmp/new-README.md README.md
          git add CHANGELOG.md README.md package.json
          if ! git diff-index --quiet HEAD; then
            git commit -m "Bot: Updating CHANGELOG, README and package.json for release based on #${{ github.event.pull_request.number }}"
            git push origin ${{ github.event.pull_request.head.ref }}
          fi