Fix download by not using processx

app.R

@@ -621,12 +621,50 @@ server <- function(input, output, session) {
   })
 
 
-  export <- function(model, fPath) {
 
-    
-    return(zipFile)
+  exportOrca <- function (p, file = "plot.png", format = tools::file_ext(file),
+    scale = NULL, width = NULL, height = NULL,
+    verbose = FALSE, debug = FALSE, safe = FALSE)
+  {
+      if (Sys.which("orca") == "") {
+          stop("The orca command-line utility is required to use the `orca()` function.\n\n",
+              "Follow the installation instructions here -- https://github.com/plotly/orca#installation",
+              call. = FALSE)
       }
 
+      b <- plotly_build(p)
+
+      plotlyjs <- b$dependencies[sapply(b$dependencies, function(d) { d$name == "plotly-main" })][[1]]
+      plotlyjs_file <- file.path(plotlyjs$src$file, plotlyjs$script)
+
+      args <- c(
+        "graph", shQuote(jsonlite::toJSON(
+          b$x[c("data", "layout")],
+          digits = 50,
+          auto_unbox = TRUE,
+          force = TRUE,
+          null = "null",
+          na = "null"
+        )),
+        "-o", file,
+        "--format", format,
+        "--plotlyjs", plotlyjs_file
+      )
+      if (debug)
+          args <- c(args, "--debug")
+      if (verbose)
+          args <- c(args, "--verbose")
+      if (safe)
+          args <- c(args, "--safe-mode")
+      if (!is.null(scale))
+          args <- c(args, "--scale", scale)
+      if (!is.null(width))
+          args <- c(args, "--width", width)
+      if (!is.null(height))
+          args <- c(args, "--height", height)
+
+      invisible(system2("orca", args))
+  }
 
   output$linkBackgroundData <- downloadHandler(
     filename = getModelName(),
@@ -651,17 +689,13 @@ server <- function(input, output, session) {
       oldDir <- getwd()
 
       tmp <- tempfile("")
-      
-      print(tmp)
       dir.create(tmp)
-      
       setwd(tmp)
 
       #Get the network graph
-      l1 <- orca(prepPlot("ba", "Bio-Assemblage"), "layer1.png")
-      l2 <- orca(prepPlot("op", "Output Processes"),"layer2.png")
-      l3 <- orca(prepPlot("es", "Ecosystem Services"),"layer3.png")
-      
+      l1 <- exportOrca(prepPlot("ba", "Bio-Assemblage"), "layer1.png")
+      l2 <- exportOrca(prepPlot("op", "Output Processes"),"layer2.png")
+      l3 <- exportOrca(prepPlot("es", "Ecosystem Services"),"layer3.png")
 
       #Save pressure list, confidence levels, node and edge tables in xlsx
       l <- list(