name: Publish Crate

on:
  push:
    tags:
      - "v*"

jobs:
  publish:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Check tag matches Cargo.toml version
        run: |
          TAG_VERSION="${GITHUB_REF_NAME#v}"
          CARGO_VERSION=$(grep '^version = ' Cargo.toml | head -1 | sed 's/version = "\(.*\)"/\1/')
          test "$TAG_VERSION" = "$CARGO_VERSION"

      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable

      - name: Cache cargo
        uses: Swatinem/rust-cache@v2

      - name: Dry run publish
        run: cargo publish --dry-run

      - name: Publish to crates.io
        run: cargo publish
        env:
          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

      - name: Check for changelog
        id: changelog_file
        run: |
          if [ -f CHANGELOG.md ]; then
            echo "present=true" >> "$GITHUB_OUTPUT"
          else
            echo "present=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Get changelog entry
        id: changelog
        if: steps.changelog_file.outputs.present == 'true'
        run: |
          TAG_VERSION="${GITHUB_REF_NAME#v}"
          echo "body<<EOF" >> "$GITHUB_OUTPUT"
          awk "/^## \[${TAG_VERSION}\]/{found=1; next} found && /^## /{exit} found{print}" CHANGELOG.md >> "$GITHUB_OUTPUT"
          echo "EOF" >> "$GITHUB_OUTPUT"

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v2
        with:
          body: ${{ steps.changelog.outputs.body }}