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name: Install Cygwin
description: Install Cygwin & packages

inputs:
  platform:
    description: Target platform
    required: false
    default: x64
  install-dir:
    description: Installation directory
    required: false
    default: C:\tools\cygwin
  packages:
    description: Packages to install, separated by a space
    required: false
  env:
    description: Value to set as the CYGWIN environment variable
    required: false

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

        New-Variable windows_host -Value ($os -eq 'Windows') -Option Constant

        New-Variable x64 -Value ('${{ inputs.platform }}' -eq 'x64') -Option Constant
        New-Variable install_dir -Value '${{ inputs.install-dir }}' -Option Constant
        New-Variable packages -Value '${{ inputs.packages }}' -Option Constant

        function Locate-Choco {
            $path = Get-Command 'choco' -ErrorAction SilentlyContinue
            if ($path) {
                $path.Path
            } else {
                Join-Path ${env:ProgramData} 'chocolatey' 'bin' 'choco'
            }
        }

        if ($windows_host) {
            echo 'CYGWIN=${{ inputs.env }}' >> $env:GITHUB_ENV

            $choco = Locate-Choco

            $choco_params = @(
                'install',
                '-y',
                '--no-progress',
                '--params', "/InstallDir:$install_dir"
            )
            if (!$x64) {
                $choco_params += '--x86'
            }
            $choco_params += 'cygwin'

            # Assuming that Cygwin is not installed when this is run.
            & $choco $choco_params

            # /usr/bin is really just /bin on Cygwin.
            echo (Join-Path $install_dir bin) >> $env:GITHUB_PATH
            echo (Join-Path $install_dir usr local bin) >> $env:GITHUB_PATH

            $pkg_list = $packages.Split(' ', [System.StringSplitOptions]::RemoveEmptyEntries)

            if ($pkg_list.Count -gt 0) {
                & $choco install -y --no-progress --source=cygwin $pkg_list
            }
        } else {
            throw "Sorry, installing Cygwin is unsupported on $os"
        }
      shell: pwsh

branding:
  icon: star
  color: green