Modify a filtering function from FuzzyFilter to our own

Add a feature to read markdown files only

Why we ditch FuzzyFilter?
1. It doesn't give a priority on the title match
2. It seems like to give unexpected search scores in a very, very long text

lib/notational-velocity-view.coffee

@@ -1,5 +1,6 @@
 path = require 'path'
 fs = require 'fs'
+fsPlus = require 'fs-plus'
 {$, $$, SelectListView} = require 'atom'
 
 module.exports =
@@ -11,6 +12,33 @@ class NotationalVelocityView extends SelectListView
     @addClass('notational-velocity from-top overlay')
     @loadData()
 
+  filter: (filterQuery) ->
+    queries = []
+
+    for queryStr in filterQuery.split(' ')
+      if queryStr.length
+        queries.push(new RegExp(queryStr, 'gim'))
+
+    perfs = []
+    for item,i in @items
+      perfs.push({score: 1, index: i})
+
+    for query in queries
+      for perf in perfs
+        result = @items[perf.index].filetext.match(query)
+        if result == null
+          perf.score = 0
+          continue
+        perf.score *= result.length
+        result = @items[perf.index].title.match(query)
+        if result != null
+          perf.score *= 10
+      perfs = perfs.filter (x) -> x.score > 0
+
+    perfs.sort (a, b) -> if a.score > b.score then -1 else 1
+
+    return (@items[p.index] for p in perfs)
+
   loadData: ->
     @data = []
 
@@ -19,6 +47,9 @@ class NotationalVelocityView extends SelectListView
 
     for filename in fs.readdirSync(directory)
       filepath = path.join(directory, filename)
+      if !fsPlus.isMarkdownExtension(path.extname(filename))
+        continue
+
       filetext = fs.readFileSync(filepath, 'utf8')
 
       title = ''
@@ -93,3 +124,28 @@ class NotationalVelocityView extends SelectListView
   #   super(view)
   #   return unless view.length
   #   console.log @list.indexOf(@list.find('.selected'))
+
+  populateList: ->
+    console.log 'populateList'
+    return unless @items?
+
+    filterQuery = @getFilterQuery()
+    if filterQuery.length
+      filteredItems = @filter(filterQuery)
+      #filteredItems = fuzzyFilter(@items, filterQuery, key: @getFilterKey())
+    else
+      filteredItems = @items
+
+    @list.empty()
+    if filteredItems.length
+      @setError(null)
+
+      for i in [0...Math.min(filteredItems.length, @maxItems)]
+        item = filteredItems[i]
+        itemView = $(@viewForItem(item))
+        itemView.data('select-list-item', item)
+        @list.append(itemView)
+
+      @selectItemView(@list.find('li:first'))
+    else
+      @setError(@getEmptyMessage(@items.length, filteredItems.length))