Merge pull request #216 from BigRoy/enhancement/fusion_launch_with_menu

Fusion: Add Launch Hook to start "AYON menu" on Fusion start

client/ayon_core/hosts/fusion/hooks/pre_fusion_launch_menu_hook.py

@@ -0,0 +1,36 @@
+import os
+from ayon_core.lib import PreLaunchHook
+from ayon_core.hosts.fusion import FUSION_HOST_DIR
+
+
+class FusionLaunchMenuHook(PreLaunchHook):
+    """Launch AYON menu on start of Fusion"""
+    app_groups = ["fusion"]
+    order = 9
+
+    def execute(self):
+        # Prelaunch hook is optional
+        settings = self.data["project_settings"][self.host_name]
+        if not settings["hooks"]["FusionLaunchMenuHook"]["enabled"]:
+            return
+
+        variant = self.application.name
+        if variant.isnumeric():
+            version = int(variant)
+            if version < 18:
+                print("Skipping launch of OpenPype menu on Fusion start "
+                      "because Fusion version below 18.0 does not support "
+                      "/execute argument on launch. "
+                      f"Version detected: {version}")
+                return
+        else:
+            print(f"Application variant is not numeric: {variant}. "
+                  "Validation for Fusion version 18+ for /execute "
+                  "prelaunch argument skipped.")
+
+        path = os.path.join(FUSION_HOST_DIR,
+                            "deploy",
+                            "MenuScripts",
+                            "launch_menu.py").replace("\\", "/")
+        script = f"fusion:RunScript('{path}')"
+        self.launch_context.launch_args.extend(["/execute", script])