name: Rust

on:
    pull_request:

jobs:
    clippy & fmt:
        runs-on: alpine
        container: rust:alpine
        env:
            CARGO_HOME: ${{ github.workspace }}/.cargo

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

            - name: Cache cargo packages
              uses: actions/cache@v4
              with:
                  path: |
                      .cargo/registry
                      .cargo/git
                      target
                  key: rust-build-${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
                  restore-keys: |
                      rust-${{ runner.os }}-cargo-

            - name: Install tools
              run: |
                  apk add --no-cache git
                  rustup component add clippy rustfmt

            - name: Clippy (with compile check)
              run: |
                  if [ -n "$(find . -name "Cargo.toml" -print -quit)" ]; then
                    status=0
                    for manifest in $(find . -name "Cargo.toml"); do
                      cargo clippy --manifest-path "$manifest" -- -D warnings && \
                        echo "$manifest: Clippy passed" || \
                        { echo "$manifest: Clippy failed"; status=1; }
                    done
                    exit $status
                  elif [ -n "$(find . -name "*.rs" -print -quit)" ]; then
                    echo "Rust files found but no Cargo.toml"
                    exit 1
                  else
                    echo "No Rust project found"
                  fi

            - name: Format check
              run: |
                  if [ -n "$(find . -name "Cargo.toml" -print -quit)" ]; then
                    status=0
                    for manifest in $(find . -name "Cargo.toml"); do
                      cargo fmt --manifest-path "$manifest" --check && \
                        echo "$manifest: formatting OK" || \
                        { echo "$manifest: needs formatting"; status=1; }
                    done
                    exit $status
                  elif [ -n "$(find . -name "*.rs" -print -quit)" ]; then
                    echo "Rust files found but no Cargo.toml"
                    exit 1
                  else
                    echo "No Rust project found"
                  fi