module-auto-tagging.yml

name: Altis Module Auto Tagging

on:
  push:
    branches:
      - v*-branch*

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-node@v2.4.1
      - run: npm install semver
      - uses: actions/github-script@v5
        with:
          script: |
            const semver = require( 'semver' );
            const [ owner, repo ] = '${{ github.repository }}'.split( '/' );
            const [
              ref,
              branch,
              branchVersion,
              isRC
            ] = '${{ github.ref }}'.match( /^refs\/heads\/(v(\d+)-branch(-rc)?)/ );
            const tags = await github.paginate( github.rest.git.listMatchingRefs, {
              owner,
              repo,
              ref: `tags/${ branchVersion }${ isRC ? '' : '.0' }.`,
            } );

            // Start from lowest possible tag.
            const initialTag = isRC ? `${ branchVersion }.1.0-rc.1` : `${ branchVersion }.0.0-beta.1`;

            // Find the latest tag from results.
            const newTag = tags.reduce( ( carry, tag ) => {
              const cleanTag = semver.clean( tag.ref.replace( 'refs/tags/', '' ) );
              let nextTag = '';
              if ( semver.prerelease( cleanTag ) ) {
                nextTag = semver.inc( cleanTag, 'prerelease' );
              } else {
                nextTag = semver.inc( cleanTag, 'patch' );
              }
              return semver.gt( nextTag, carry ) ? nextTag : carry;
            }, initialTag );

            const isPreRelease = semver.prerelease( newTag );

            // Don't make new Pre-Release tags once we already have one.
            if ( isPreRelease && ! isRC && newTag !== initialTag ) {
              return;
            }

            const baseTag = `${ semver.major( newTag ) }.${ semver.minor( newTag ) }.${ semver.patch( newTag ) }`;
            let nameSuffix = '';
            if ( isPreRelease ) {
              nameSuffix = isRC ? 'Preview Release' : isPreRelease.join( ' ' );
              nameSuffix = ' ' + nameSuffix;
            }

            // Create new tag.
            await github.request( `POST /repos/${{ github.repository }}/releases`, {
              name: `${ baseTag }${ nameSuffix }`,
              tag_name: newTag,
              target_commitish: branch,
              generate_release_notes: true,
              prerelease: !! isPreRelease,
            } );