add spinning icons

app.R

@@ -147,23 +147,32 @@ server <- function(input, output, session) {
     # if generating is TRUE we want it to be disabled, otherwise it's enabled
     # if generating is `NULL`, then the model is not yet loaded
     btn <- if (is.null(context$generating) || context$generating == "loading") {
-      btn <- list(class = "btn-secondary disabled", label = "Loading model ...")
+      btn <- list(class = "btn-secondary disabled", label = "Loading model ...", 
+                  icon = icon("spinner", class="fa-spin"))
       insertUI(
         "#sendButton", 
-        ui = actionButton("send", width = "100%", label = btn$label, class = btn$class), 
+        ui = actionButton(
+          "send",
+          icon =  btn$icon,
+          width = "100%", 
+          label = btn$label, 
+          class = btn$class
+        ), 
         immediate = TRUE
       )
       btn
     } else if (context$generating == "error") {
       list(class = "btn-secondary disabled", label = "Generating error ...")
     } else if (context$generating) {
-      list(class = "btn-secondary disabled", label = "Generating response ...")
+      list(class = "btn-secondary disabled", label = "Generating response ...", 
+           icon = icon("spinner", class="fa-spin"))
     } else {
       list(class = "btn-primary", label = "Send")
     }
     
     output$sendButton <- renderUI({
-      actionButton("send", width = "100%", label = btn$label, class = btn$class)
+      actionButton("send", width = "100%", label = btn$label, class = btn$class,
+                   icon = btn$icon)
     })
   })