Rewrite WindowsSDK detection

scripts/getWindowsSDK.ps1

@@ -1,39 +1,96 @@
 [CmdletBinding()]
 param(
+    [Parameter(Mandatory=$False)]
+    [switch]$DisableWin10SDK = $False,
 
+    [Parameter(Mandatory=$False)]
+    [switch]$DisableWin81SDK = $False
 )
 
+if ($DisableWin10SDK -and $DisableWin81SDK)
+{
+    throw "Both Win10SDK and Win81SDK were disabled."
+}
+
+Write-Verbose "Executing $($MyInvocation.MyCommand.Name)"
 $scriptsDir = split-path -parent $MyInvocation.MyCommand.Definition
+
+$validInstances = New-Object System.Collections.ArrayList
+
 $CandidateProgramFiles = $(& $scriptsDir\getProgramFiles32bit.ps1), $(& $scriptsDir\getProgramFilesPlatformBitness.ps1)
+Write-Verbose "Program Files Candidate locations: $([system.String]::Join(',', $CandidateProgramFiles))"
 
 # Windows 10 SDK
+Write-Verbose "`n"
+Write-Verbose "Looking for Windows 10 SDK"
 foreach ($ProgramFiles in $CandidateProgramFiles)
 {
     $folder = "$ProgramFiles\Windows Kits\10\Include"
+    Write-Verbose "$folder - Checking"
     if (!(Test-Path $folder))
     {
+        Write-Verbose "$folder - Not Found"
         continue
     }
 
+    Write-Verbose "$folder - Found"
     $win10sdkVersions = @(Get-ChildItem $folder | Where-Object {$_.Name -match "^10"} | Sort-Object)
     [array]::Reverse($win10sdkVersions) # Newest SDK first
 
     foreach ($win10sdkV in $win10sdkVersions)
     {
-        if (Test-Path "$folder\$win10sdkV\um\windows.h")
+        $windowsheader = "$folder\$win10sdkV\um\windows.h"
+        Write-Verbose "$windowsheader - Checking"
+        if (!(Test-Path $windowsheader))
         {
-            return $win10sdkV.ToString()
+            Write-Verbose "$windowsheader - Not Found"
+            continue
         }
+
+        Write-Verbose "$windowsheader - Found"
+        $win10sdkVersionString = $win10sdkV.ToString()
+        Write-Verbose "Found $win10sdkVersionString"
+        $validInstances.Add($win10sdkVersionString) > $null
     }
 }
 
 # Windows 8.1 SDK
+Write-Verbose "`n"
+Write-Verbose "Looking for Windows 8.1 SDK"
 foreach ($ProgramFiles in $CandidateProgramFiles)
 {
     $folder = "$ProgramFiles\Windows Kits\8.1\Include"
-    if (Test-Path $folder)
+    Write-Verbose "$folder - Checking"
+    if (!(Test-Path $folder))
     {
-        return "8.1"
+        Write-Verbose "$folder - Not Found"
+        continue
+    }
+
+    Write-Verbose "$folder - Found"
+    $win81sdkVersionString = "8.1"
+    Write-Verbose "Found $win81sdkVersionString"
+    $validInstances.Add($win81sdkVersionString) > $null
+}
+
+Write-Verbose "`n`n`n"
+Write-Verbose "The following Windows SDKs were found:"
+foreach ($instance in $validInstances)
+{
+    Write-Verbose $instance
+}
+
+# Selecting
+foreach ($instance in $validInstances)
+{
+    if (!$DisableWin10SDK -and $instance -match "10.")
+    {
+        return $instance
+    }
+
+    if (!$DisableWin81SDK -and $instance -match "8.1")
+    {
+        return $instance
     }
 }