Pass lunr options when building the index

Taken from pouchdb-community#90

README.md

@@ -4,6 +4,7 @@ PouchDB Quick Search
 Fork notes:
 - Applies pouchdb-community/pouchdb-quick-search#99 Change md5 dependency
 - Applies pouchdb-community/pouchdb-quick-search#85 check for pouchdb through global variable
+- Applies pouchdb-community/pouchdb-quick-search#90 Add lunr.js options when building the index
 
 
 [![Build Status](https://travis-ci.org/nolanlawson/pouchdb-quick-search.svg)](https://travis-ci.org/nolanlawson/pouchdb-quick-search)
@@ -82,6 +83,7 @@ API
 * [Minimum should match (mm)](#minimum-should-match-mm)
 * [Filtering documents](#filtering-documents)
 * [Building the index](#building-the-index)
+* [Passing Options to lunr.js during build](#passing-options-to-lunr.js-during-build)
 * [Deleting the index](#deleting-the-index)
 * [Stale queries](#stale-queries)
 * [Other languages](#other-languages)
@@ -428,6 +430,24 @@ This will build up the index without querying it. If the database has changed si
 
 You must at least provide the `fields` you want to index.  If the language isn't English, you must pass in the `language` option.  Boosts don't matter.
 
+### Passing Options to lunr.js during build
+
+You can pass in options to lunr.js during the index build by adding a `lunrOptions` option to the search. `lunrOptions` is a function whereby you can access the lunr instance via `this` from within the function. For example, if you wanted to add a function to the pipeline, you could do it like so:
+
+```js
+pouch.search({
+  fields: ['title', 'text'],
+  build: true,
+  lunrOptions: function(){
+    this.pipeline.add(function (token, tokenIndex, tokens) {
+      // text processing in here
+    })
+  }
+});
+```
+More info on the lunr.js methods available here: http://lunrjs.com/docs/
+
+
 ### Deleting the index
 
 If, for whatever reason, you need to delete an index that's been saved to disk, you can pass in `{destroy: true}` to the `search()` function, and instead of searching, it will delete the external search database.

lib/index.js

@@ -117,6 +117,7 @@ exports.search = utils.toPromise(function (opts, callback) {
   var stale = opts.stale;
   var limit = opts.limit;
   var build = opts.build;
+  var lunrOptions = build ? opts.lunrOptions : null;
   var skip = opts.skip || 0;
   var language = opts.language || 'en';
   var filter = opts.filter;
@@ -142,11 +143,12 @@ exports.search = utils.toPromise(function (opts, callback) {
   var indexPipeline;
   if (!index) {
     index = indexes[language] = lunr(function() {
+      lunrOptions && lunrOptions.bind(this)(lunr);
       indexPipeline = this.pipeline;
       if (Array.isArray(language)) {
-        this.use(global.lunr['multiLanguage'].apply(this, language));
+        this.use(lunr['multiLanguage'].apply(this, language));
       } else if (language !== 'en') {
-        this.use(global.lunr[language]);
+        this.use(lunr[language]);
       }
     });
     index.searchPipeline = index.pipeline;

test/test.js

@@ -19,11 +19,10 @@ chai.use(require("chai-as-promised"));
 var should = chai.should(); // var should = chai.should();
 require('bluebird'); // var Promise = require('bluebird');
 
-// have to make this global for the languages plugin, sadly
-global.lunr = require('lunr');
-require('./deps/lunr.stemmer.support')(global.lunr);
-require('./deps/lunr.fr')(global.lunr);
-require('./deps/lunr.multi')(global.lunr);
+var lunrStemmer = require('./deps/lunr.stemmer.support');
+var lunrFr = require('./deps/lunr.fr');
+var lunrMulti = require('./deps/lunr.multi');
+
 var dbs;
 if (process.browser) {
   dbs = 'testdb' + Math.random();
@@ -643,6 +642,18 @@ function tests(dbName, dbType) {
 
     it('indexes english and french simultaneously', function () {
       return db.bulkDocs({docs: docs7}).then(function () {
+        var opts = {
+          fields: ['text'],
+          language: 'fr',
+          build: true,
+          lunrOptions: function(lunr) {
+            lunrStemmer(lunr);
+            lunrFr(lunr);
+            lunrMulti(lunr);
+          }
+        };
+        return db.search(opts);
+      }).then(function (res) {
         var opts = {
           fields: ['text'],
           query: 'parlera',