name: Build Boost
description: Download & build Boost

inputs:
  version:
    description: Version to build
    required: true
  libraries:
    description: Space-separated list of libraries
    required: true
  toolset:
    description: Toolset to use
    required: false
    default: auto
  platform:
    description: Target platform
    required: false
    default: x64
  configuration:
    description: Configuration to build
    required: false
    default: Release
  static:
    description: Build static libraries
    required: false
    default: 0
  static-runtime:
    description: Link to the static runtime
    required: false
    default: 0
  directory:
    description: Destination directory
    required: false

outputs:
  root:
    description: Root Boost directory
    value: '${{ steps.build.outputs.root }}'
  librarydir:
    description: Directory with built Boost libraries
    value: '${{ steps.build.outputs.librarydir }}'

runs:
  using: composite
  steps:
    - id: install
      run: |
        New-Variable os -Value '${{ runner.os }}' -Option Constant
        New-Variable windows_host -Value ($os -eq 'Windows') -Option Constant

        if (Get-Command python3 -ErrorAction SilentlyContinue) {
            $python = @('python3')
        } elseif (Get-Command py -ErrorAction SilentlyContinue) {
            $python = @('py', '-3')
        } elseif (Get-Command python -ErrorAction SilentlyContinue) {
            $python = @('python')
        } else {
            echo @'
        ::error ::
        egor-tensin/build-boost depends on a PyPI package, which requires Python 3.6 or later.
        We couldn't find a Python installation in this environment.
        '@
            exit 1
        }

        $exe, $args = $python
        & $exe $args -m pip install --user --upgrade cmake-common~=3.0

        if ($windows_host) {
            $bin_dir = & $exe $args -c "import sysconfig; print(sysconfig.get_path('scripts', 'nt_user'))"
        } else {
            $bin_dir = & $exe $args -c "import sysconfig; print(sysconfig.get_path('scripts', 'posix_user'))"
        }

        echo "bin_dir=$bin_dir" >> $env:GITHUB_OUTPUT
      env:
        PIP_NO_PYTHON_VERSION_WARNING: 1
        PIP_DISABLE_PIP_VERSION_CHECK: 1
        # This is hilarious: --no-warn-script-location is defined with
        # action='store_false', which is why it's kind of inverted compared to
        # the options above.
        # https://github.com/pypa/pip/issues/5200
        PIP_NO_WARN_SCRIPT_LOCATION: 0
      shell: pwsh

    - id: build
      run: |
        New-Variable os -Value '${{ runner.os }}' -Option Constant
        New-Variable windows_host -Value ($os -eq 'Windows') -Option Constant
        New-Variable macos_host -Value ($os -eq 'macOS') -Option Constant

        New-Variable base_dir -Value '${{ runner.workspace }}' -Option Constant
        New-Variable version -Value '${{ inputs.version }}' -Option Constant
        New-Variable toolset -Value '${{ inputs.toolset }}' -Option Constant
        New-Variable platform -Value '${{ inputs.platform }}' -Option Constant
        New-Variable configuration -Value '${{ inputs.configuration }}' -Option Constant
        New-Variable static -Value ('${{ inputs.static }}' -eq '1') -Option Constant
        New-Variable static_runtime -Value ('${{ inputs.static-runtime }}' -eq '1') -Option Constant

        $boost_dir = '${{ inputs.directory }}'
        if (-not $boost_dir) {
            $boost_dir = Join-Path $base_dir boost
        }

        $libraries = '${{ inputs.libraries }}'
        $libraries = $libraries.Split(' ', [System.StringSplitOptions]::RemoveEmptyEntries)

        if (-not $libraries) {
            echo @'
        ::warning ::
        No Boost libraries were explicitly selected for building, going to try to build them all.
        This is likely to fail.
        '@
        }

        $libraries = $libraries | %{"--with-$_"}

        $bin_dir = '${{ steps.install.outputs.bin_dir }}'
        $path_sep = [IO.Path]::PathSeparator
        $env:Path = "$bin_dir$path_sep$env:PATH"

        $link = if ($static) {'static'} else {'shared'}
        $runtime_link = if ($static_runtime) {'static'} else {'shared'}

        if ($macos_host) {
            # This is pure insanity. For some reason, the Python's bin/
            # directory is in Path, but not in PATH (found out using echo)!
            # Every person responsible for this mess is insane.
            $env:PATH = $env:Path
        }

        boost-download --cache $base_dir -- $version $boost_dir
        boost-build `
            --toolset $toolset `
            --platform $platform `
            --configuration $configuration `
            --link $link `
            --runtime-link $runtime_link `
            -- `
            $boost_dir `
            $libraries

        $platformdir = $platform
        if ($platformdir -eq 'auto' -and $windows_host) {
            $platformdir = 'x64'
        }
        $librarydir = Join-Path $boost_dir 'stage' $platformdir $configuration 'lib'

        echo "root=$boost_dir"        >> $env:GITHUB_OUTPUT
        echo "librarydir=$librarydir" >> $env:GITHUB_OUTPUT
      shell: pwsh

branding:
  icon: star
  color: green