Modify filter selection more like nvalt

1. If the title starts with the query, select it.
2. If there is no title start with the query, do not select any.

lib/notational-velocity-view.coffee

@@ -10,40 +10,30 @@ class NotationalVelocityView extends SelectListView
     @addClass('notational-velocity from-top overlay')
     @loadData()
 
+  selectItem: (filterQuery) ->
+    if filterQuery.length == 0
+      return null
+
+    titleQuery = filterQuery.toLowerCase()
+    titleItems = @items
+      .filter (x) -> x.title.toLowerCase()[...titleQuery.length] is titleQuery
+      .sort (x, y) -> x.modified > y.modified
+    titleItem = if titleItems.length > 0 then titleItems[0] else null
+    return titleItem
+
   filter: (filterQuery) ->
-    queries = []
+    if filterQuery.length == 0
+      return @items
 
-    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})
-
-    # The most recent one comes to the top.
-    for query in queries
-      for perf in perfs
-        if @items[perf.index].filetext.match(query) != null || @items[perf.index].title.match(query) != null
-          perf.score = @items[perf.index].modified
-        else
-          perf.score = 0
-
-        # This snippet implements a manual relevance metric.
-        # 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)
+    queries = filterQuery.split(' ')
+      .filter (x) -> x.length > 0
+      .map (x) -> new RegExp(x, 'gi')
+    contentItems = @items
+      .filter (x) ->
+        queries
+          .map (q) -> q.test(x.filetext) || q.test(x.test)
+          .reduce (x, y) -> x && y
+    return contentItems
 
   loadData: ->
     @data = []
@@ -98,6 +88,17 @@ class NotationalVelocityView extends SelectListView
           @div class: 'metadata', "#{item.modified.toLocaleDateString()}"
         @div class: 'secondary-line', "#{content}"
 
+  confirmSelection: ->
+    item = @getSelectedItem()
+    if item?
+      @confirmed(item)
+    else
+      query = @getFilterQuery()
+      if query?
+        # TODO(seongjae): It should create a new document.
+        console.log(query)
+      @cancel()
+
   confirmed: (item) ->
     console.log 'confirmed #{item}'
     atom.workspace.open(item.filepath)
@@ -126,11 +127,8 @@ class NotationalVelocityView extends SelectListView
     return unless @items?
 
     filterQuery = @getFilterQuery()
-    if filterQuery.length
-      filteredItems = @filter(filterQuery)
-      #filteredItems = fuzzyFilter(@items, filterQuery, key: @getFilterKey())
-    else
-      filteredItems = @items
+    filteredItems = @filter(filterQuery)
+    selectedItem = @selectItem(filterQuery)
 
     @list.empty()
     if filteredItems.length
@@ -142,6 +140,9 @@ class NotationalVelocityView extends SelectListView
         itemView.data('select-list-item', item)
         @list.append(itemView)
 
-      @selectItemView(@list.find('li:first'))
+      if selectedItem
+        n = filteredItems.indexOf(selectedItem) + 1
+        @selectItemView(@list.find("li:nth-child(#{n})"))
+
     else
       @setError(@getEmptyMessage(@items.length, filteredItems.length))