First attemts at using lunr search engine

docs/source/_static/js/lunr/search.js

@@ -0,0 +1,95 @@
+//
+// Using the pre-generated index file, set up a dynamic
+// search mechanims that returns quick suggestions of the
+// best matches you start to enter.
+//
+
+var lunrIndex,
+    $results,
+    documents;
+
+function initLunr() {
+  // retrieve the index file
+  $.getJSON("_static/js/lunr/search_index.json")
+    .done(function(index) {
+
+        lunrIndex = lunr.Index.load(index)
+
+        // documents = index;
+
+        // lunrIndex = lunr(function(){
+        //   this.ref('url')
+        //   this.field('body')
+
+        //   this.field("title", {
+        //       boost: 10
+        //   });
+
+        //   documents.forEach(function(doc) {
+        //     try {
+        //       this.add(doc)
+        //     } catch (e) {}
+        //   }, this)
+        // })
+    })
+    .fail(function(jqxhr, textStatus, error) {
+        var err = textStatus + ", " + error;
+        console.error("Error getting Lunr index file:", err);
+    });
+}
+
+function search(query) {
+  return lunrIndex.search(query).map(function(result) {
+    return documents.filter(function(page) {
+      try {
+        console.log(page)
+        return page.href === result.ref;
+      } catch (e) {
+        console.log('Error in search. ' + e)
+      }
+    })[0];
+  });
+}
+
+function renderResults(results) {
+  if (!results.length) {
+    return;
+  }
+
+  // show first ten results
+  results.slice(0, 10).forEach(function(result) {
+    var $result = $("<li>");
+
+    $result.append($("<a>", {
+      href: result.url,
+      text: "» " + result.title
+    }));
+
+    $results.append($result);
+  });
+}
+
+function initUI() {
+  $results = $("#lunrsearchresults");
+
+  $("#lunrsearch").keyup(function(){
+    // empty previous results
+    $results.empty();
+
+    // trigger search when at least two chars provided.
+    var query = $(this).val();
+    if (query.length < 2) {
+      return;
+    }
+
+    var results = search(query);
+
+    renderResults(results);
+  });
+}
+
+initLunr();
+
+$(document).ready(function(){
+  initUI();
+});