name: Lint Rust sources
on:
  pull_request:
    paths:
    - 'src/rust/**'

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      -
        uses: actions/checkout@v4
      -
        name: Get changed files
        id: files
        uses: Ana06/get-changed-files@v2.2.0
        with:
          format: json
      -
        name: Cache rust stuff
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry/index
            ~/.cargo/registry/cache
            ~/.cargo/git/db
            ~/.cargo/bin
            src/rust/**/target
          key: ${{ runner.os }}-cargo3-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: ${{ runner.os }}-cargo3-
      -
        uses: actions-rs/toolchain@v1
        with:
          toolchain: nightly
          override: true
          components: clippy
          target: wasm32-unknown-unknown
      -
        name: Other dependencies
        run: sudo apt-get install -y moreutils
      -
        name: Lint sources
        id: lint
        run: |
          shopt -s globstar

          echo "::group::Linting"
          readarray -t TEMP <<< "$(jq -r '.[]' <<<'${{ steps.files.outputs.added_modified }}')"

          while IFS= read -r -d $'\0' i; do
            if [[ "$i" == *"src/rust"* ]]; then
              (
                cd "$i"
                cargo clippy --message-format=json > annotations.json
                jq --arg WORKING_DIRECTORY "${i%/}" \
                   -rsf ${{ github.workspace }}/.github/workflows/supporting/annotations.jq annotations.json
              )
            fi
          done < <(printf "%s\n" "${TEMP[@]}" | cut -d'/' -f-3 | sort -u | grep 'src' | tr '\n' '\0')
          echo "::endgroup::"

          echo "::group::Generating summary"
          jq --arg RUSTC_VERSION "$(rustc --version)" \
             --arg CARGO_VERSION "$(cargo --version)" \
             --arg CLIPPY_VERSION "$(cargo clippy --version)" \
             -srf ${{ github.workspace }}/.github/workflows/supporting/summary.jq ./**/annotations.json > $GITHUB_STEP_SUMMARY
          echo "::endgroup::"

          echo "::group::Failing this step if clippy generated anything"
          for annotation in ./**/annotations.json; do
            LINT_COUNT=$(jq -sr 'map(select(.reason == "compiler-message" and .message.code and .message.spans[].is_primary)) | length' $annotation)

            if ! [ "$LINT_COUNT" = "0" ]; then
              exit 1
            fi
          done
          echo "::endgroup::"