name: Metadata

on:
  pull_request:

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout head repository
        uses: actions/checkout@v2

      - name: Store head version
        run: |
          sed -n -e 's/^.*version: /head_version=/p' plugin.rb >> $GITHUB_ENV

      - name: Checkout base repository
        uses: actions/checkout@v2
        with:
          ref: "${{ github.base_ref }}"

      - name: Store base version
        run: |
          sed -n -e 's/^.*version: /base_version=/p' plugin.rb >> $GITHUB_ENV

      - name: Setup node
        uses: actions/setup-node@v2
        with:
          node-version: 14

      - name: Install semver
        run: npm install --include=dev

      - name: Check version
        uses: actions/github-script@v5
        with:
          script: |
            const semver = require('semver');
            const { head_version, base_version } = process.env;

            if (semver.lte(head_version, base_version)) {
              core.setFailed("Head version is equal to or lower than base version.");
            }