action.yml

name: 'Setup C/C++'
description: 'Sets up a C/C++ build environment'

inputs:
  compiler-id:
    description: 'Desired CMake compiler ID to use'
    required: false
  compiler-version:
    description: 'Desired compiler version to use'
    required: false
    default: 'latest'
  compiler-arch:
    description: 'Desired compiler architecture'
    required: false
    default: 'amd64'

outputs:
  compiler-id:
    description: 'Detected CMake compiler ID'
    value: ${{ steps.determine-compiler.outputs.compiler-id }}
  compiler-version:
    description: 'Detected compiler version'
    value: ${{ steps.determine-compiler.outputs.compiler-version }}

runs:
  using: composite
  steps:
    - run: echo "##[add-matcher]${{ github.action_path }}/gcc-matcher.json"
      shell: bash

    - name: Setup Visual Studio Developer Command Prompt
      if: ${{ runner.os == 'Windows' && inputs.compiler-id == 'MSVC' }}
      shell: pwsh
      run: |
        echo "##[add-matcher]${{ github.action_path }}/msvc-matcher.json"

        $hostArch = switch ("${Env:PROCESSOR_ARCHITECTURE}") {
          "AMD64" { "amd64" }
          "ARM64" { Write-Error -Message "ARM64 is not a valid host architecture" -ErrorAction Stop }
          default { "x86" }
        }

        $targetArch = switch ("${{ inputs.compiler-arch }}") {
          "amd64" { "amd64" }
          "arm64" { "arm64" }
          "x86" { "x86" }
          default { Write-Error -Message "Unsupported target architecture $_" -ErrorAction Stop }
        }

        $vsWhere = "${Env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe"
        $installationPath = & $vsWhere -prerelease -latest -property installationPath
        if ($installationPath -and (test-path "$installationPath\Common7\Tools\vsdevcmd.bat")) {
          & "${env:COMSPEC}" /s /c "`"$installationPath\Common7\Tools\vsdevcmd.bat`" -no_logo -host_arch=$hostArch -arch=$targetArch && set" | foreach-object {
            $name, $value = $_ -split '=', 2
            $currentValue = if (Test-Path -Path "env:\$name") { (Get-Item -Path "env:\$name").Value } else { $null }
            if ($value -ne $currentValue) {
              if ($name -eq 'PATH') {
                echo "$value" >> "${Env:GITHUB_PATH}"
              } else {
                echo "$name=$value" >> "${Env:GITHUB_ENV}"
              }
            }
          }
        }

    - name: Determine installed compiler and version
      id: determine-compiler
      shell: bash
      run: |
        awk -f- <(cmake --system-information) >> "$GITHUB_OUTPUT" << "EOF"
        $1 == "CMAKE_CXX_COMPILER_ID" { gsub(/"/, "", $2); print "compiler-id=" $2 }
        $1 == "CMAKE_CXX_COMPILER_VERSION" { gsub(/"/, "", $2); print "compiler-version=" $2 }
        EOF