action.yml

name: Setup C++
description: 'Configure the C++ toolchain, clang-format, and compiler caching'

inputs:
  cache:
    description: 'Enable ccache on Linux/macOS and sccache on Windows'
    default: 'true'
  cache_key:
    description: 'Additional compiler cache key'
    default: 'cpp'
  clang_format:
    description: 'Install clang-format when it is not already available'
    default: 'true'
  msvc_arch:
    description: 'MSVC target architecture on Windows'
    default: 'x64'

runs:
  using: 'composite'
  steps:
    - name: Configure MSVC
      uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1.13.0
      with:
        arch: ${{ inputs.msvc_arch }}
      if: ${{ runner.os == 'Windows' }}

    - name: Install clang-format (Linux)
      shell: bash
      run: |
        if ! command -v clang-format >/dev/null 2>&1; then
          sudo apt-get update
          sudo apt-get install --yes clang-format
        fi
        clang-format --version
      if: ${{ inputs.clang_format == 'true' && runner.os == 'Linux' }}

    - name: Install clang-format (macOS)
      shell: bash
      run: |
        if ! command -v clang-format >/dev/null 2>&1; then
          brew install clang-format
        fi
        clang-format --version
      if: ${{ inputs.clang_format == 'true' && runner.os == 'macOS' }}

    - name: Install clang-format (Windows)
      shell: pwsh
      run: |
        if (-not (Get-Command clang-format -ErrorAction SilentlyContinue)) {
          choco install llvm --no-progress --yes
          $env:Path = "C:\Program Files\LLVM\bin;$env:Path"
          "C:\Program Files\LLVM\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
        }
        clang-format --version
      if: ${{ inputs.clang_format == 'true' && runner.os == 'Windows' }}

    - name: Setup compiler cache
      uses: hendrikmuhs/ccache-action@d62db5f07c26379fc4b4e0916f098a92573c3b03 # v1.2.23
      with:
        key: ${{ runner.os }}-${{ inputs.cache_key }}
        variant: ${{ runner.os == 'Windows' && 'sccache' || 'ccache' }}
        create-symlink: ${{ runner.os != 'Windows' }}
      if: ${{ inputs.cache == 'true' }}

    - name: Use sccache for MSVC
      shell: bash
      run: |
        echo 'CC=sccache cl' >> "$GITHUB_ENV"
        echo 'CXX=sccache cl' >> "$GITHUB_ENV"
      if: ${{ inputs.cache == 'true' && runner.os == 'Windows' }}