name: Rust Setup + Cache
description: Install Rust toolchain and cache cargo/rustup dependencies for Gitea Actions
author: eric

inputs:
  toolchain:
    description: Rust toolchain to install (e.g., stable, 1.75.0, nightly)
    default: stable
    required: false

outputs:
  cache-hit:
    description: "Whether a cache entry was found"
    value: ${{ steps.cache.outputs.cache-hit }}

runs:
  using: composite
  steps:
    - name: Cache cargo + rustup
      id: cache
      uses: https://gitea.com/actions/cache@v3
      with:
        path: |
          ~/.cargo/registry
          ~/.cargo/git
          ~/.rustup/toolchains
          ~/.rustup/settings.toml
          target
        key: rust-linux-${{ hashFiles('**/Cargo.lock') }}-${{ hashFiles('**/Cargo.toml') }}
        restore-keys: |
          rust-linux-${{ hashFiles('**/Cargo.lock') }}-
          rust-linux-

    - name: Setup Rust
      shell: bash
      run: |
        # If toolchain was cached, rustup will skip download — install still runs for metadata
        curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
          | sh -s -- -y --default-toolchain ${{ inputs.toolchain }}
        # Add cargo bin to PATH for subsequent steps
        echo "$HOME/.cargo/bin" >> $GITHUB_PATH

    - name: Show cached sizes
      shell: bash
      run: |
        echo "=== ~/.cargo ===" && du -sh ~/.cargo 2>/dev/null || echo "(empty)"
        echo "=== ~/.rustup ===" && du -sh ~/.rustup 2>/dev/null || echo "(empty)"
        echo "=== target ==="   && du -sh target 2>/dev/null   || echo "(empty)"