From a95b5bcb27f8ddf79886429e0fa4de0b3f94d867 Mon Sep 17 00:00:00 2001
From: Aprotim Sanyal <aprotim@gmail.com>
Date: Thu, 18 Oct 2018 00:56:29 -0700
Subject: [PATCH] Give user feedback when options is not parsing.

---
 docs/demo/demo.css | 5 +++++
 docs/demo/demo.js  | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/docs/demo/demo.css b/docs/demo/demo.css
index 66b870ad..cf116bfc 100644
--- a/docs/demo/demo.css
+++ b/docs/demo/demo.css
@@ -65,3 +65,8 @@ header h1 {
 #preview iframe {
 	flex-grow: 1;
 }
+
+#options.badParse {
+	border-color: red;
+	background-color: #FEE
+}
diff --git a/docs/demo/demo.js b/docs/demo/demo.js
index 09b30dc2..7da5fe3b 100644
--- a/docs/demo/demo.js
+++ b/docs/demo/demo.js
@@ -181,7 +181,9 @@ function checkForChanges() {
       var optionsString = $optionsElem.value || '{}';
       var newOptions = JSON.parse(optionsString);
       options = newOptions;
+      $optionsElem.classList.remove('badParse');
     } catch (err) {
+      $optionsElem.classList.add('badParse');
     }
 
     var lexed = marked.lexer($markdownElem.value, options);