Reposition headers based on score

Enforce min score

source/javascripts/app/search.js

@@ -42,6 +42,23 @@
       .on('blur', inactive);
   }
 
+  function refToHeader (itemRef) {
+    return $('.tocify-item[data-unique=' + itemRef + ']').closest('.tocify-header');
+  }
+
+  function sortDescending (obj2, obj1) {
+    var s1 = parseInt(obj1.id.replace(/[^\d]/g, ''), 10);
+    var s2 = parseInt(obj2.id.replace(/[^\d]/g, ''), 10);
+    return s1 === s2 ? 0 : s1 < s2 ? -1 : 1;
+  }
+
+  function resetHeaderLocations () {
+    var headers = $(".tocify-header").sort(sortDescending);
+    $.each(headers, function (index, item) {
+      $(item).insertBefore($("#toc ul:first-child"));
+    });
+  }
+
   function search (event) {
     var sections = $('section, #toc .tocify-header');
 
@@ -53,12 +70,37 @@
 
     if (this.value) {
       sections.hide();
-      var results = index.search(this.value);
+      // results are sorted by score in descending order
+      var tmpResults = index.search(this.value);
+      var results = [];
+
+      // remove low score matches
+      $.each(tmpResults, function (index, item) {
+        if (item.score >= 0.0001) results.push(item);
+      });
+
       if (results.length) {
+        lastRef = null;
+        resetHeaderLocations();
         $.each(results, function (index, item) {
-          $('#section-' + item.ref).show();
-          $('.tocify-item[data-unique=' + item.ref + ']').closest('.tocify-header').show();
+          var itemRef = item.ref;
+          $('#section-' + itemRef).show();
+          // headers must be repositioned in the DOM
+          var closestHeader = refToHeader(itemRef);
+          if (lastRef) {
+            refToHeader(lastRef).insertBefore(closestHeader);
+          }
+          closestHeader.show();
+          lastRef = itemRef;
         });
+
+        // position first element. it wasn't positioned above if len > 1
+        if (results.length > 1) {
+          var firstRef = results[0].ref;
+          var secondRef = results[1].ref
+          refToHeader(firstRef).insertBefore(refToHeader(secondRef));
+        }
+
         highlight.call(this);
       } else {
         sections.show();