plugin to parse {{root_url}} for links and imr src

gatsby-config.js

@@ -46,6 +46,7 @@ module.exports = {
       resolve: 'gatsby-transformer-remark',
       options: {
         plugins: [
+          'sendgrid-remark-paths',
           {
             resolve: 'gatsby-remark-images',
             options: {

plugins/sendgrid-remark-paths/index.js

@@ -0,0 +1,27 @@
+const visit = require('unist-util-visit');
+
+module.exports = ({ markdownAST, pathPrefix }) => {
+  const uriPrefix = pathPrefix.length ? pathPrefix : '';
+
+  // Replace {{root_url}} for all links
+  visit(markdownAST, 'link', (node) => {
+    if (
+      node.url &&
+      node.url.startsWith('{{root_url}}')
+    ) {
+      node.url = node.url.replace('{{root_url}}', uriPrefix);
+    }
+  });
+
+  // Replace {{root_url}} for all imags
+  visit(markdownAST, 'image', (node) => {
+    if (
+      node.url &&
+      node.url.startsWith('{{root_url}}')
+    ) {
+      node.url = node.url.replace('{{root_url}}', uriPrefix);
+    }
+  });
+
+  return markdownAST;
+};

plugins/sendgrid-remark-paths/package.json

@@ -0,0 +1 @@
+{}