From 86ee47270032452cc298b8d9299184ac51adacda Mon Sep 17 00:00:00 2001
From: Petr Shevtsov <petr.shevtsov@gmail.com>
Date: Wed, 1 Mar 2017 23:10:35 +0300
Subject: [PATCH] Merge options if plugin was already added

---
 R/dependency.R | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/R/dependency.R b/R/dependency.R
index a2c34ae..27764ba 100644
--- a/R/dependency.R
+++ b/R/dependency.R
@@ -56,6 +56,15 @@ dyPlugin <- function(dygraph, name, path, options = list(), version = "1.0") {
   if (length(options) == 0) {
     options <- JS("{}")
   }
+  # merge options if plugin was already added
+  if (name %in% names(dygraph$x$plugins)) {
+    current.options <- dygraph$x$plugins[[name]]
+    i <- match(names(current.options), names(options))
+    i <- is.na(i)
+    if (any(i)) {
+      options[names(current.options)[which(i)]] = current.options[which(i)]
+    }
+  }
   dygraph$x$plugins[[name]] <- options
 
   # return dygraph