add reactions file to 9P session tree

session/sessionfile.go

@@ -98,6 +98,14 @@ func (h *sessionHelper) fileSpec(name string, mode os.FileMode) fs.FileSpec {
 			h.sess.mu.RUnlock()
 			return data, nil
 		}
+	case "reactions":
+		fs.Read = func() ([]byte, error) {
+			data, err := json.Marshal(h.sess.Core.Reactions())
+			if err != nil {
+				return nil, err
+			}
+			return append(data, '\n'), nil
+		}
 	case "chat":
 		fs.Read = func() ([]byte, error) {
 			h.sess.mu.RLock()