carla-plugin: Send max-plugin-number var

source/backend/engine/CarlaEngineNative.cpp

@@ -961,6 +961,10 @@ protected:
 
         fUiServer.writeAndFixMsg("carla-file-exts");
         fUiServer.writeAndFixMsg(carla_get_supported_file_extensions());
+
+        fUiServer.writeAndFixMsg("carla-max-plugin-number");
+        std::sprintf(fTmpBuf, "%i\n", pData->maxPluginNumber);
+        fUiServer.writeMsg(fTmpBuf);
     }
 
     void uiServerOptions()

source/carla_backend.py

@@ -2894,6 +2894,7 @@ class CarlaHostPlugin(CarlaHostMeta):
         self.fCompleteLicenseText = ""
         self.fJuceVersion         = ""
         self.fSupportedFileExts   = ""
+        self.fMaxPluginNumber     = 0
         self.fLastError           = ""
         self.fOscUrlTCP           = ""
         self.fOscUrlUDP           = ""
@@ -3007,7 +3008,7 @@ class CarlaHostPlugin(CarlaHostMeta):
         return len(self.fPluginsInfo)
 
     def get_max_plugin_number(self):
-        return 0 # TODO
+        return self.fMaxPluginNumber
 
     def add_plugin(self, btype, ptype, filename, name, label, uniqueId, extraPtr):
         return self.sendMsgAndSetError(["add_plugin", btype, ptype, filename, name, label, uniqueId])

source/modules/native-plugins/resources/carla-plugin

@@ -320,6 +320,10 @@ class CarlaMiniW(ExternalUI, HostWindow):
                 exts = self.readlineblock().replace("\r", "\n")
                 self.host.fSupportedFileExts = exts
 
+            elif msg == "carla-max-plugin-number":
+                maxnum = int(self.readlineblock())
+                self.host.fMaxPluginNumber = maxnum
+
             elif msg == "error":
                 error = self.readlineblock().replace("\r", "\n")
                 engineCallback(self.host, ENGINE_CALLBACK_ERROR, 0, 0, 0, 0.0, error)