draft-release-from-pr.yml

name: Draft Release from PR

on:
  push:
    branches:
      - master

permissions:
  contents: write
  pull-requests: read

jobs:
  draft-release:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Get last merged PR
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh pr list \
            --state merged \
            --base master \
            --limit 1 \
            --json number,title,body,labels \
            > pr.json
          
          PR_NUM=$(jq -r '.[0].number // "none"' pr.json)
          PR_TITLE=$(jq -r '.[0].title // "none"' pr.json)
          echo "Found merged PR: #$PR_NUM - $PR_TITLE"

      - name: Get latest release version
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          LAST_TAG=$(gh release list --limit 1 --json tagName -q '.[0].tagName')

          if [[ -z "$LAST_TAG" || "$LAST_TAG" == "null" ]]; then
            echo "No existing release found. A release tag is required to calculate the next version."
            exit 1
          fi

          echo "Found latest release: $LAST_TAG"
          echo "LAST_TAG=$LAST_TAG" >> $GITHUB_ENV

      - name: Calculate next version from labels
        run: |
          V="${LAST_TAG#v}"

          MAJOR=$(echo $V | cut -d. -f1)
          MINOR=$(echo $V | cut -d. -f2)
          PATCH=$(echo $V | cut -d. -f3)

          LABELS=$(jq -r '.[0].labels[].name' pr.json)
          echo "Found labels: $LABELS"

          if echo "$LABELS" | grep -q "major"; then
            echo "Bumping MAJOR version"
            MAJOR=$((MAJOR+1))
            MINOR=0
            PATCH=0
          elif echo "$LABELS" | grep -q "minor"; then
            echo "Bumping MINOR version"
            MINOR=$((MINOR+1))
            PATCH=0
          else
            echo "Bumping PATCH version"
            PATCH=$((PATCH+1))
          fi

          echo "Calculated next version: v$MAJOR.$MINOR.$PATCH"
          echo "VERSION=v$MAJOR.$MINOR.$PATCH" >> $GITHUB_ENV

      - name: Create DRAFT release using PR BODY
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR_BODY=$(jq -r '.[0].body // ""' pr.json)

          echo "Creating draft release..."
          echo "Version: $VERSION"

          gh release create "$VERSION" \
            --draft \
            --title "$VERSION" \
            --notes "$PR_BODY"
          
          echo "Draft release created successfully!"