Snippets matching the cursor's word prefix are inserted on 'tab' events

src/app/buffer.coffee

@@ -32,6 +32,12 @@ class Buffer
   getPath: ->
     @path
 
+  getExtension: ->
+    if @getPath()
+      @getPath().split('/').pop().split('.').pop()
+    else
+      null
+
   setPath: (path) ->
     @path = path
     @trigger "path-change", this

src/app/cursor.coffee

@@ -155,6 +155,9 @@ class Cursor
   getCurrentLineBufferRange: ->
     @editSession.bufferRangeForBufferRow(@getBufferRow())
 
+  getCurrentWordPrefix: ->
+    @editSession.getTextInBufferRange([@getBeginningOfCurrentWordBufferPosition(), @getBufferPosition()])
+
   isAtBeginningOfLine: ->
     @getBufferPosition().column == 0
 

src/app/edit-session.coffee

@@ -329,6 +329,9 @@ class EditSession
   getSelectedText: ->
     @getLastSelection().getText()
 
+  getTextInBufferRange: (range) ->
+    @buffer.getTextInRange(range)
+
   moveCursorUp: ->
     @moveCursors (cursor) -> cursor.moveUp()
 

src/app/tokenized-buffer.coffee

@@ -23,8 +23,7 @@ class TokenizedBuffer
     @aceAdaptor = new AceAdaptor(this)
 
   requireAceMode: ->
-    extension = if @buffer.getPath() then @buffer.getPath().split('/').pop().split('.').pop() else null
-    modeName = switch extension
+    modeName = switch @buffer.getExtension()
       when 'js' then 'javascript'
       when 'coffee' then 'coffee'
       when 'rb', 'ru' then 'ruby'