version-bump.yml

name: Version Bump on PR Merge

on:
  pull_request:
    types: [closed]
    branches:
      - main

jobs:
  version-bump:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
      
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}
          ref: main
      
      - name: Setup Rust
        uses: actions-rs/toolchain@v1
        with:
          toolchain: stable
          profile: minimal
          override: true
      
      - name: Install cargo-edit
        run: cargo install cargo-edit
      
      - name: Get current version
        id: get_version
        run: |
          CURRENT_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version')
          echo "current_version=$CURRENT_VERSION" >> "$GITHUB_OUTPUT"
          echo "Current version: $CURRENT_VERSION"
      
      - name: Determine version bump type
        id: version_type
        run: |
          LABELS="${{ join(github.event.pull_request.labels.*.name, ' ') }}"
          echo "PR Labels: $LABELS"
          
          if [[ "$LABELS" == *"major"* ]]; then
            echo "bump_type=major" >> "$GITHUB_OUTPUT"
            echo "Version bump: MAJOR"
          elif [[ "$LABELS" == *"minor"* ]]; then
            echo "bump_type=minor" >> "$GITHUB_OUTPUT"
            echo "Version bump: MINOR"
          else
            echo "bump_type=patch" >> "$GITHUB_OUTPUT"
            echo "Version bump: PATCH (default)"
          fi

      - name: Bump version
        run: |
          cargo set-version --bump ${{ steps.version_type.outputs.bump_type }}
          NEW_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version')
          echo "New version: $NEW_VERSION"
          echo "new_version=$NEW_VERSION" >> "$GITHUB_ENV"
      
      - name: Configure Git
        run: |
          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git config --local user.name "github-actions[bot]"
      
      - name: Create version bump branch and commit
        run: |
          git checkout -b "release/v${{ env.new_version }}"
          git add Cargo.toml Cargo.lock
          git commit -m "Release v${{ env.new_version }}"
          git tag "v${{ env.new_version }}"
      
      - name: Build release artifacts
        run: |
          cargo build --release
          cargo test --release -- --test-threads=1
      
      - name: Push tag
        run: |
          git push origin "v${{ env.new_version }}"
      
      - name: Check if version exists on crates.io
        id: check_version
        run: |
          if cargo search gonfig --limit 1 | grep -q "gonfig = \"${{ env.new_version }}\""; then
            echo "version_exists=true" >> "$GITHUB_OUTPUT"
            echo "Version ${{ env.new_version }} already exists on crates.io"
          else
            echo "version_exists=false" >> "$GITHUB_OUTPUT"
            echo "Version ${{ env.new_version }} does not exist, proceeding with publish"
          fi

      - name: Publish to crates.io
        if: steps.check_version.outputs.version_exists == 'false'
        run: |
          cargo publish
        env:
          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

      - name: Create GitHub Release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: v${{ env.new_version }}
          release_name: Release v${{ env.new_version }}
          body: |
            ## Changes in this release

            This release was automatically created from PR #${{ github.event.pull_request.number }}

            **PR Title:** ${{ github.event.pull_request.title }}

            **Version Bump:** ${{ steps.version_type.outputs.bump_type | upper }}

            **Merged by:** @${{ github.event.pull_request.merged_by.login }}
            
            ### Published to crates.io
            ${{ steps.check_version.outputs.version_exists == 'false' && 'This version has been published to [crates.io](https://crates.io/crates/gonfig) and is available for use in your projects.' || 'This version was already available on [crates.io](https://crates.io/crates/gonfig).' }}
            
            ```toml
            [dependencies]
            gonfig = "${{ env.new_version }}"
            ```
          draft: false
          prerelease: false
      
      - name: Create version update PR
        run: |
          git push origin "release/v${{ env.new_version }}"
          gh pr create --title "Update version to v${{ env.new_version }}" \
                       --body "Automated version update following release v${{ env.new_version }}" \
                       --base main \
                       --head "release/v${{ env.new_version }}"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}