version.yml

name: Resolve Version

on:
  workflow_call:
    inputs:
      version:
        description: "Version to release (x.y.z). Leave empty for auto patch bump."
        required: false
        type: string
        default: ''
    outputs:
      version:
        description: "Resolved release version"
        value: ${{ jobs.version.outputs.version }}

jobs:
  version:
    name: Resolve version
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.version_push.outputs.version || steps.version_dispatch.outputs.version }}
    steps:
      - name: Resolve version (push)
        id: version_push
        if: github.event_name != 'workflow_dispatch'
        run: |
          echo "push event: version resolves to latest"
          echo "version=latest" >> "$GITHUB_OUTPUT"

      - name: Resolve version (dispatch)
        id: version_dispatch
        if: github.event_name == 'workflow_dispatch'
        env:
          INPUT_VERSION: ${{ inputs.version }}
          GH_TOKEN: ${{ github.token }}
          GH_REPO: ${{ github.repository }}
        run: |
          set -euo pipefail

          latest=$(gh release list --limit 100 --exclude-drafts --exclude-pre-releases \
            --json tagName --jq '.[].tagName' \
            | grep -E '^[0-9]+\.[0-9]+\.[0-9]+$' | grep -v '^9\.9\.' | sort -V | tail -1)
          [[ -n "$latest" ]] || { echo "No x.y.z releases found"; exit 1; }
          IFS='.' read -r cur_major cur_minor cur_patch <<< "$latest"

          if [ -z "$INPUT_VERSION" ]; then
            version="${cur_major}.${cur_minor}.$((cur_patch + 1))"
            echo "No version provided, auto patch bump: ${latest} -> ${version}"
          else
            if ! [[ "$INPUT_VERSION" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
              echo "Invalid version format: ${INPUT_VERSION} (expected x.y.z)"
              exit 1
            fi
            IFS='.' read -r new_major new_minor new_patch <<< "$INPUT_VERSION"
            if ! ([ "$new_major" -eq $((cur_major + 1)) ] && [ "$new_minor" -eq 0 ] && [ "$new_patch" -eq 0 ]) &&
               ! ([ "$new_major" -eq "$cur_major" ] && [ "$new_minor" -eq $((cur_minor + 1)) ] && [ "$new_patch" -eq 0 ]) &&
               ! ([ "$new_major" -eq "$cur_major" ] && [ "$new_minor" -eq "$cur_minor" ] && [ "$new_patch" -eq $((cur_patch + 1)) ]); then
              echo "Invalid version bump: ${latest} -> ${INPUT_VERSION} (expected $((cur_major + 1)).0.0, ${cur_major}.$((cur_minor + 1)).0, or ${cur_major}.${cur_minor}.$((cur_patch + 1)))"
              exit 1
            fi
            version="$INPUT_VERSION"
            echo "Using provided version: ${version}"
          fi

          echo "version=${version}" >> "$GITHUB_OUTPUT"