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
  symlinks-to-hardlinks:
    description: Convert symlinks in /usr/bin to hardlinks
    required: false
    default: 0

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 '${{ inputs.packages }}' -Option Constant
        New-Variable symlinks_to_hardlinks -Value ('${{ inputs.symlinks-to-hardlinks }}' -eq '1') -Option Constant

        New-Variable bash -Value (Join-Path $install_dir bin bash.exe) -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
            }

            if ($symlinks_to_hardlinks) {
                echo @'
        while IFS= read -d '' -r link_path; do
            dest_path="$( readlink --canonicalize-existing -- "$link_path" )"
            dest_ext=".${dest_path##*.}"
            [ "$dest_ext" == ".$dest_path" ] && dest_ext=
            link_ext=".${link_path##*.}"
            [ "$link_ext" == ".$link_path" ] && link_ext=
            echo "Removing symlink $link_path" && rm -f -- "$link_path"
            [ "$link_ext" != "$dest_ext" ] && echo "${PATHEXT//\;/
        }" | grep -q --ignore-case --line-regexp -F -- "$dest_ext" && link_path="$link_path$dest_ext"
            echo "Creating hardlink $link_path -> $dest_path" && ln -- "$dest_path" "$link_path"
        done < <( find /usr/bin -type l -print0 )
        '@ | & $bash --login -o errexit -o nounset -o pipefail -o igncr
            }
        } else {
            throw "Sorry, installing Cygwin is unsupported on $os"
        }
      shell: pwsh

branding:
  icon: star
  color: green