first spike of buffer modified indicator

src/app/buffer.coffee

@@ -186,6 +186,7 @@ class Buffer
     @change(range, '')
 
   change: (oldRange, newText) ->
+    @trigger 'buffer-change'
     oldRange = Range.fromObject(oldRange)
     operation = new BufferChangeOperation({buffer: this, oldRange, newText})
     @pushOperation(operation)
@@ -223,6 +224,7 @@ class Buffer
     @undoManager.redo(editSession)
 
   save: ->
+    @trigger 'buffer-change'
     @saveAs(@getPath())
 
   saveAs: (path) ->

src/app/status-bar.coffee

@@ -17,7 +17,9 @@ class StatusBar extends View
 
   @content: ->
     @div class: 'status-bar', =>
-      @div class: 'current-path', outlet: 'currentPath'
+      @div class: 'file-info', =>
+        @div class: 'current-path', outlet: 'currentPath'
+        @div class: 'buffer-modified', outlet: 'bufferModified'
       @div class: 'cursor-position', outlet: 'cursorPosition'
 
   initialize: (@rootView, @editor) ->
@@ -27,6 +29,15 @@ class StatusBar extends View
     @updateCursorPositionText()
     @editor.on 'cursor-move', => @updateCursorPositionText()
 
+    @updateBufferModifiedText()
+    @editor.getBuffer().on 'buffer-change', => @updateBufferModifiedText()
+
+  updateBufferModifiedText: ->
+    if @editor.getBuffer().isModified()
+      @bufferModified.text('*')
+    else
+      @bufferModified.text('')
+
   updatePathText: ->
     path = @editor.getPath()
     if path
@@ -37,4 +48,3 @@ class StatusBar extends View
   updateCursorPositionText: ->
     { row, column } = @editor.getCursorBufferPosition()
     @cursorPosition.text("#{row + 1},#{column + 1}")
-

static/status-bar.css

@@ -5,6 +5,14 @@
   position: relative;
 }
 
+.status-bar .file-info {
+  float: left;
+}
+
+.status-bar .buffer-modified {
+  float: right;
+}
+
 .status-bar .cursor-position {
   position: absolute;
   right: 5px;