Pass 'hidden' property back from Chord view to libmapper graph. Now t…

…hat saving is being handled by mappersession we need access to this property in the Python backend, since hidden devices must be omitted from generated session files.

js/views/ChordView.js

@@ -192,6 +192,9 @@ class ChordView extends View {
             }
             else
                 dev.hidden = true;
+            self.graph.devices.forEach(d => command.send("set_dev", { "name"    : d.name,
+                                                                      "hidden"  : d.hidden,
+                                                                      "publish" : false }));
             self.showDevLabel(self, dev, e);
             self.draw(0);
         });

webmapper.py

@@ -273,6 +273,28 @@ def set_map_properties(props, map):
             map[key] = val
     map.push()
 
+def set_dev_properties(props):
+    print('set_dev_properties()', props)
+
+    # find dev by name
+    dev = graph.devices().filter(mpr.Property.NAME, props['name'])
+    if not dev:
+        return
+    dev = dev.next()
+
+    print('found dev: ', dev)
+    del props['name']
+
+    pub = False
+    if 'publish' in props:
+        publish = props['publish']
+        del props['publish']
+
+    # set metadata
+    for key in props:
+        dev.set_property(key, props[key], publish=pub)
+    dev.push()
+
 def set_sig_properties(props):
 #    check how arbitrary metadata are set – can we use this instead?
     print('set_sig_properties()', props)
@@ -455,6 +477,8 @@ def poll_and_push():
 
 server.add_command_handler("subscribe", lambda x: subscribe(x))
 
+server.add_command_handler("set_dev", lambda x: set_dev_properties(x))
+
 server.add_command_handler("add_signals",
                            lambda x: ("add_signals", [sig_props(s) for s in graph.signals()]))