synchronise-pr-version-npm.yml

name: Synchronise PR Version

on:
  workflow_call:
    inputs:
      pr-number:
        required: true
        type: number
      trunk-branch:
        required: true
        type: string
        default: main
    secrets:
      bot-id:
        required: true
      bot-key:
        required: true

permissions:
  contents: write
  pull-requests: write

concurrency:
  group: ${{ github.workflow }}-${{ inputs.pr-number }}
  cancel-in-progress: true

jobs:
  synchronise-version:
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      PR_NUMBER: ${{ inputs.pr-number }}
      TRUNK_BRANCH: ${{ inputs.trunk-branch }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ inputs.trunk-branch }}
      - name: Retrieve PR details
        id: pr-details
        run: |
          VERSION_LABEL=$(gh pr view $PR_NUMBER --json labels --jq '.labels | map(select(.name == "v:major" or .name == "v:minor" or .name == "v:patch")) | sort_by(.name) | .[0].name')
          PR_BRANCH=$(gh pr view $PR_NUMBER --json headRefName --jq .headRefName)
          echo "Pull request branch: $PR_BRANCH"
          echo "Pull Request Version label: $VERSION_LABEL"
          echo "pr_branch=$PR_BRANCH" >> $GITHUB_OUTPUT
          echo "version_label=$VERSION_LABEL" >> $GITHUB_OUTPUT
      - name: Retrieve ${{ inputs.trunk-branch }} branch version
        id: trunk-details
        run: |
          TRUNK_VERSION=$(jq -r .version package.json)
          echo "Version on `$TRUNK_BRANCH`: $TRUNK_VERSION"
          echo "trunk_version=$TRUNK_VERSION" >> $GITHUB_OUTPUT
      - name: Checkout PR
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ steps.pr-details.outputs.pr_branch }}
      - name: Update version
        id: update
        if: ${{ steps.pr-details.outputs.version_label }}
        env:
          TRUNK_VERSION: ${{ steps.trunk-details.outputs.trunk_version }}
          VERSION_LABEL: ${{ steps.pr-details.outputs.version_label }}
        run: |
          get_next_version() {
            local base="$1"
            local increment_type="$2"
            local RE='[^0-9]*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)\([0-9A-Za-z-]*\)'

            local MAJOR=$(echo $base | sed -e "s#$RE#\1#")
            local MINOR=$(echo $base | sed -e "s#$RE#\2#")
            local PATCH=$(echo $base | sed -e "s#$RE#\3#")

            case "$increment_type" in
            major)
              ((MAJOR += 1))
              ((MINOR = 0))
              ((PATCH = 0))
              ;;
            minor)
              ((MINOR += 1))
              ((PATCH = 0))
              ;;
            patch)
              ((PATCH += 1))
              ;;
            esac

            local NEXT_VERSION="$MAJOR.$MINOR.$PATCH"
            echo "$NEXT_VERSION"
          }

          next_version=$(get_next_version $TRUNK_VERSION ${VERSION_LABEL:2})
          current_version=$(jq -r .version package.json)

          if [ "$next_version" != "$current_version" ]; then
            npm version $next_version --allow-same-version=true --git-tag-version=false
            echo "new_version=$(jq -r .version package.json)" >> $GITHUB_OUTPUT
          else
            echo "Version does not need updating"
          fi
      - name: Generate a token
        id: generate-token
        uses: actions/create-github-app-token@v1
        with:
          app-id: ${{ secrets.bot-id }}
          private-key: ${{ secrets.bot-key }}
      - uses: planetscale/ghcommit-action@v0.2.0
        with:
          commit_message: "Updating version to ${{ steps.update.outputs.new_version }}"
          repo: ${{ github.repository }}
          branch: ${{ steps.pr-details.outputs.pr_branch }}
        env:
          GITHUB_TOKEN: ${{ steps.generate-token.outputs.token }}
      - name: Remove stale
        run: |
          gh pr edit $PR_NUMBER --remove-label v:stale || true