JS: Add REPL interactive console

applications/system/js_app/examples/apps/Scripts/interactive.js

@@ -0,0 +1,29 @@
+let dialog = require("dialog");
+let keyboard = require("keyboard");
+let storage = require("storage");
+
+// Need to run code from file, and filename must be unique
+let tmp_template = "/ext/apps_data/js_app/.interactive.tmp.";
+let tmp_number = 0;
+
+let result = "Run JavaScript Code";
+while (dialog.message("Interactive Console", result)) {
+    let input = keyboard.text(256);
+    if (!input) break;
+
+    let path = tmp_template + to_string(tmp_number++);
+    storage.write(path, "({run:function(){return " + input + ";},})");
+    result = load(path).run();
+    storage.remove(path);
+
+    // Must convert to string explicitly
+    if (typeof result === "number") {
+        result = to_string(result);
+    } else if (typeof result === "undefined") {
+        result = "undefined";
+    } else if (typeof result === "boolean") {
+        result = result ? "true" : "false";
+    } else if (typeof result === "object") {
+        result = JSON.stringify(result);
+    }
+}