Atom Tools: Created base class for document-based applications

Moving some duplicated code to a common base class

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/Atom/Tools/AtomToolsFramework/Code/Source/Document/AtomToolsDocumentApplication.cpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project.
+ * For complete copyright and license terms please see the LICENSE at the root of this distribution.
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+
+#include <AtomToolsFramework/Document/AtomToolsDocumentApplication.h>
+#include <AtomToolsFramework/Document/AtomToolsDocumentSystemRequestBus.h>
+
+namespace AtomToolsFramework
+{
+    AtomToolsDocumentApplication::AtomToolsDocumentApplication(int* argc, char*** argv)
+        : Base(argc, argv)
+    {
+    }
+
+    void AtomToolsDocumentApplication::ProcessCommandLine(const AZ::CommandLine& commandLine)
+    {
+        // Process command line options for opening documents on startup
+        size_t openDocumentCount = commandLine.GetNumMiscValues();
+        for (size_t openDocumentIndex = 0; openDocumentIndex < openDocumentCount; ++openDocumentIndex)
+        {
+            const AZStd::string openDocumentPath = commandLine.GetMiscValue(openDocumentIndex);
+
+            AZ_Printf(GetBuildTargetName().c_str(), "Opening document: %s", openDocumentPath.c_str());
+            AtomToolsDocumentSystemRequestBus::Broadcast(&AtomToolsDocumentSystemRequestBus::Events::OpenDocument, openDocumentPath);
+        }
+
+        Base::ProcessCommandLine(commandLine);
+    }
+} // namespace AtomToolsFramework