Set semver prerelease as pre-release

[Lombra]

Would like an option to to autmatically mark the file as a pre-release if versioned as a semver pre-release. (eg 1.1.0-beta.2)

Don't know whether there exists another way to accomplish this?

[erikhuizinga]

Something like this might work for you:

name: Create a GitHub release
on:
  push:
jobs:
  release:
    name: Create a GitHub release
    if: startsWith(github.ref, 'refs/tags/')
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Check if tag is a SemVer (pre-)release
        run: |
          # SemVer regex adapted for bash from:
          # https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
          SEMVER_REGEX="^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)(-((0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*)(\.(0|[1-9][0-9]*|[0-9]*[a-zA-Z-][0-9a-zA-Z-]*))*))?(\+([0-9a-zA-Z-]+(\.[0-9a-zA-Z-]+)*))?$"
          if [[ "$GITHUB_REF_NAME" =~ $SEMVER_REGEX ]]; then  # If it matches, then it's a SemVer name
            prereleasePart="${BASH_REMATCH[5]}"  # The 5th group is the pre-release part
          else
            echo "Version $GITHUB_REF_NAME is not SemVer" 1>&2
            exit 1
          fi
          if [[ -n "$prereleasePart" ]]; then  # If not empty, then it's a pre-release
            echo "is_prerelease=true" >> "$GITHUB_ENV"
          else
            echo "is_prerelease=false" >> "$GITHUB_ENV"
          fi
      - name: Create a GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          prerelease: ${{ env.is_prerelease }}

Disclaimer: I manually edited this from a more complex setup, renaming a few things here and there for the purposes of leaving a comment here that would hopefully be helpful. I can't guarantee that this would actually work as-is in a GitHub Actions workflow: there might be errors, both in the YAML syntax and at runtime.