create-release-build.yml

name: Create Release Build
run-name: "Release Build"

on:
  workflow_dispatch:
    inputs:
      optional-release-tag:
        description: "Optional release tag (if empty, will search previous commit titles for MAJOR/MINOR and autoincrement latest tag accordingly)"
        required: false

defaults:
  run:
    shell: bash

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:

  construct-release-tag:
    runs-on: ubuntu-latest
    outputs:
      release-tag: ${{ steps.construct-release-tag.outputs.release-tag }}
    steps:

      - uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Get previous git tag
        id: previous-tag
        uses: WyriHaximus/github-action-get-previous-tag@v1
        with:
          fallback: 0.0.0

      - name: Get next semver from previous tag
        id: next-semvers
        uses: WyriHaximus/github-action-next-semvers@v1
        with:
          version: ${{ steps.previous-tag.outputs.tag }}

      - name: Construct release tag
        id: construct-release-tag
        run: |
          RELEASE_TAG=""

          # Check for null tag:
          if [[ "${{ inputs.optional-release-tag }}" = "0.0.0" || (-z "${{ inputs.optional-release-tag }}" && "${{ steps.previous-tag.outputs.tag }}" = "0.0.0") ]]; then
            echo "❌ - Null tag (0.0.0) is invalid for a release (hint: repo could contain no tags)"
            exit 1
          fi

          # If tag not given by user, deduce from commit titles since last tag:
          if test -z "${{ inputs.optional-release-tag }}"; then
            echo "Autoincrementing version based on previous commit titles since last tag"

            # Search previous commits for MAJOR/MINOR text tokens:
            IS_MAJOR_BUMP=false
            IS_MINOR_BUMP=false
            echo "Checking commit titles since last tag: '${{ steps.previous-tag.outputs.tag }}'..."
            COMMITS=$(git log --pretty=format:%s ${{ steps.previous-tag.outputs.tag }}..@)
            while read commit
            do
              if [[ $commit == *"MAJOR"* ]]; then
                echo -e "\tMajor: title='$commit'"
                IS_MAJOR_BUMP=true
              elif [[ $commit == *"MINOR"* ]]; then
                echo -e "\tMinor: title='$commit'"
                IS_MINOR_BUMP=true
              else
                echo -e "\tPatch: title='$commit'"
              fi
            done <<< "$COMMITS"

            # Set version according to what was found in commit titles:
            if [ "$IS_MAJOR_BUMP" = true ]; then
              echo "Bumping major version"
              RELEASE_TAG=${{ steps.next-semvers.outputs.major }}
            elif [ "$IS_MINOR_BUMP" = true ]; then
              echo "Bumping minor version"
              RELEASE_TAG=${{ steps.next-semvers.outputs.minor }}
            else
              # If no major/minor found, treat as patch:
              echo "Bumping patch version"
              RELEASE_TAG=${{ steps.next-semvers.outputs.patch }}
            fi
          else
            echo "Using user provided release tag"
            RELEASE_TAG=${{ inputs.optional-release-tag }}
          fi

          # Check if valid semver:
          regex='^([0-9]+\.){2}(\*|[0-9]+)(-.*)?$'
          if [[ ! "$RELEASE_TAG" =~ $regex ]]; then
            echo "❌ - Release tag is not a valid semver: $RELEASE_TAG"
            exit 1
          fi
          echo "✔ - Release tag is a valid semver"

          # Check if tag already exists:
          if git rev-parse "$RELEASE_TAG" >/dev/null 2>&1; then
            echo "❌ - Release tag already exists: $RELEASE_TAG"
            exit 1
          fi
          echo "✔ - Release tag does not exist"

          echo "Release tag: $RELEASE_TAG"
          echo "release-tag=$(echo $RELEASE_TAG)" >> $GITHUB_OUTPUT

  release:
    needs: ['construct-release-tag']
    uses: "./.github/workflows/release.yml"
    secrets: inherit
    with:
      version: ${{ needs.construct-release-tag.outputs.release-tag }}