Close the UE editor automatically

inc/ueeditor.ps1

@@ -0,0 +1,26 @@
+
+function Close-UE-Editor {
+    param (
+        [string]$uprojectname,
+        [bool]$dryrun
+    )
+
+    # Filter by project name in main window title, it's always called "Project - Unreal Editor"
+    $ue4proc = Get-Process UE4Editor -ErrorAction SilentlyContinue | Where-Object {$_.MainWindowTitle -like "$uprojectname*" }
+    if ($ue4proc) {
+        if ($dryrun) {
+            Write-Output "UE4 project is currently open in editor, would have closed"
+        } else {
+            Write-Output "UE4 project is currently open in editor, closing..."
+            $ue4proc.CloseMainWindow() > $null 
+            Start-Sleep 5
+            if (!$ue4proc.HasExited) {
+                throw "Couldn't close UE4 gracefully, aborting!"
+            }
+        }
+    } else {
+        Write-Verbose "UE4 project is not open in editor"
+    }
+    Remove-Variable ue4proc
+
+}

ue4-package.ps1

@@ -23,6 +23,7 @@ param (
 . $PSScriptRoot\inc\projectversion.ps1
 . $PSScriptRoot\inc\uproject.ps1
 . $PSScriptRoot\inc\ueinstall.ps1
+. $PSScriptRoot\inc\ueeditor.ps1
 
 
 function Write-Usage {
@@ -176,6 +177,11 @@ try {
         if ($src -ne ".") { Pop-Location }
     }
 
+
+    $editorprojname = [System.IO.Path]::GetFileNameWithoutExtension($projfile)
+    Close-UE-Editor $editorprojname $dryrun
+
+    
     $ueEditorCmd = Join-Path $ueinstall "Engine/Binaries/Win64/UE4Editor-Cmd$exeSuffix"
     $runUAT = Join-Path $ueinstall "Engine/Build/BatchFiles/RunUAT$batchSuffix"