Support uninstalling unity setup instances

Author: jwittner

UnitySetup/UnitySetup.psd1

@@ -79,6 +79,7 @@ FunctionsToExport = @(
     'Get-UnitySetupInstance',
     'Install-UnitySetupInstance',
     'Select-UnitySetupInstance',
+    'Uninstall-UnitySetupInstance',
     'Start-UnityEditor'
 )
 # Cmdlets to export from this module, for best performance, do not use wildcards and do not delete the entry, use an empty array if there are no cmdlets to export.

UnitySetup/UnitySetup.psm1

@@ -365,6 +365,51 @@ function Install-UnitySetupInstance
     }
 }
 
+<#
+.Synopsis
+   Uninstall Unity Setup Instances
+.DESCRIPTION
+   Uninstall the specified Unity Setup Instances 
+.PARAMETER Instance
+   What instances of UnitySetup should be uninstalled
+.EXAMPLE
+   Get-UnitySetupInstance | Uninstall-UnitySetupInstance
+#>
+function Uninstall-UnitySetupInstance {
+    [CmdletBinding(SupportsShouldProcess)]
+    param(
+        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
+        [UnitySetupInstance[]] $Instances
+    )
+
+    process {
+        foreach ( $setupInstance in $Instances ) {
+            $uninstaller = Get-ChildItem "$($setupInstance.Path)" -Filter 'Uninstall.exe' -Recurse |
+                Select-Object -First 1 -ExpandProperty FullName
+
+            if($null -eq $uninstaller) { 
+                Write-Error "Could not find Uninstaller.exe under $($setupInstance.Path)"
+                continue
+            }
+
+            $startProcessArgs = @{
+                'FilePath' = $uninstaller;
+                'PassThru' = $true;
+                'Wait' = $true;
+                'ErrorAction' = 'Stop';
+                'ArgumentList' = @("/S");
+            }
+
+            if( -not $PSCmdlet.ShouldProcess("$uninstaller", "Start-Process")) { continue }
+
+            $process = Start-Process @startProcessArgs
+            if ( $process.ExitCode -ne 0 ) {
+                Write-Error "Uninstaller quit with non-zero exit code"
+            }
+        }
+    }
+}
+
 <#
 .Synopsis
    Get the Unity versions installed