Use NodeJS NPM package markdownlint instead of Ruby gem mdl

scripts/build-index.js

@@ -0,0 +1,47 @@
+'use strict';
+
+var glob = require("glob");
+
+function parsePlatform(pagefile) {
+  return pagefile.split(/\//)[1];
+}
+
+function parsePagename(pagefile) {
+  return pagefile.split(/\//)[2].replace(/\.md$/, '');
+}
+
+function buildShortPagesIndex(files) {
+  var reducer = function(index, file) {
+    var os = parsePlatform(file);
+    var page = parsePagename(file);
+    if (index[page]) {
+      index[page].push(os);
+    } else {
+      index[page] = [os];
+    }
+    return index;
+  };
+
+  return files.reduce(reducer, {});
+}
+
+function buildPagesIndex(shortIndex) {
+  return Object.keys(shortIndex)
+    .sort()
+    .map(function(page) {
+      return {
+        name: page,
+        platform: shortIndex[page]
+      };
+    });
+}
+
+function saveIndex(index) {
+  console.log(JSON.stringify(index));
+}
+
+glob("pages/**/*.md", function (er, files) {
+  var shortIndex = buildShortPagesIndex(files);
+  var index = buildPagesIndex(shortIndex);
+  saveIndex(index);
+});