add GS patch

activity.hpp

@@ -15,6 +15,8 @@
 #include <rlib/require/cxx14>
 #include <rlib/scope_guard.hpp>
 
+#include "dirty-plugins.hpp"
+
 namespace CIS {
     using std::string;
     using namespace rlib::literals;
@@ -142,7 +144,7 @@ namespace CIS {
         Flow(const Flow &another) : queuedOnRight(another.queuedOnRight), xamlCode(another.xamlCode), prevOperationIsSequential(another.prevOperationIsSequential) {}
 
         // Actually modify xamlCode on "OperationChange". 
-        // for example, A >> B >> C >> D | E. ABCD should be merged into one sequential operation. 
+        // for example, A >> B >> C >> (D | E). ABCD should be merged into one sequential operation. 
         Flow operator>>(const Flow &seqNext) const {
             return binaryOperation(seqNext, true);
         }
@@ -230,7 +232,7 @@ namespace CIS {
     inline auto Flow::generateXaml(Metadata metadata) const {
         Flow finalized(*this);
         finalized.reduceQueuedIfNecessary(!finalized.prevOperationIsSequential); // Always necessary if queue is not empty.
-        return metadata.generateXamlHead() + finalized.xamlCode + metadata.generateXamlTail();
+        return metadata.generateXamlHead() + dirty_plugins::patchGS(finalized.xamlCode) + metadata.generateXamlTail();
     }
     inline auto Flow::generateXaml(std::string className) const {
         Metadata defaultMetadata(className);

dirty-plugins.hpp

+#ifndef CIS_WORKFLOW_GEN_DIRTY_PLUGIN_HPP
+#define CIS_WORKFLOW_GEN_DIRTY_PLUGIN_HPP
+
+#include <rlib/string.hpp>
+#include "xaml-template.hpp"
+
+namespace CIS::dirty_plugins {
+    rlib::string patchGS(const rlib::string &input) {
+        rlib::string output (input);
+        auto pos_seq = output.find("ControlledSequence");
+        auto pos_par = output.find("ControlledParallel");
+        rlib::string plugin_text = CIS::templates::PLUGIN_GlobalSettingsVariable_SEQ;
+        if(pos_seq == rlib::string::npos && pos_par == rlib::string::npos)
+            return output;
+        else if(pos_seq == rlib::string::npos || pos_par < pos_seq)
+            plugin_text.replace("ControlledSequence", "ControlledParallel");
+        // else OutMost is sequence, nothing to do. 
+            
+        return output.replace_once(">\n", ">\n" + plugin_text);
+    }
+}
+
+#endif
+

xaml-template.hpp

@@ -110,6 +110,13 @@ constexpr auto NOOP_XAML =
 R"XAML(    <mwcwa:NoOpsActivity DisplayName="__TEMPLATE_ARG_DisplayName" __TEMPLATE_ARG_EntityDefPlaceholder/>
 )XAML";
 
+// The top-level Sequence or Parallel, need to add this "plugin" to make it happy. 
+constexpr auto PLUGIN_GlobalSettingsVariable_SEQ = 
+R"XAML(    <mwcwa:ControlledSequence.Variables>
+      <Variable x:TypeArguments="mwcwcs:GlobalSettings" Name="GlobalSettings" />
+    </mwcwa:ControlledSequence.Variables>
+)XAML";
+
 }
 }