Hitting tab on a line (containing only whitespace) will auto indent the line and set the cursor to the end

src/app/edit-session.coffee

@@ -131,7 +131,12 @@ class EditSession
 
   insertTab: ->
     if @getSelection().isEmpty()
-      if @softTabs
+      whitespaceMatch = @lineForBufferRow(@getCursorBufferPosition().row).match /^\s*$/
+      if @autoIndent and whitespaceMatch
+        indentation = @indentationForRow(@getCursorBufferPosition().row)
+        @getSelection().selectLine()
+        @insertText(indentation)
+      else if @softTabs
         @insertText(@tabText)
       else
         @insertText('\t')
@@ -225,6 +230,9 @@ class EditSession
   largestFoldStartingAtScreenRow: (screenRow) ->
     @displayBuffer.largestFoldStartingAtScreenRow(screenRow)
 
+  indentationForRow: (row) ->
+    @tokenizedBuffer.indentationForRow(row)
+
   autoIndentTextAfterBufferPosition: (text, bufferPosition) ->
     return { text } unless @autoIndent
     @tokenizedBuffer.autoIndentTextAfterBufferPosition(text, bufferPosition)

src/app/tokenized-buffer.coffee

@@ -48,6 +48,11 @@ class TokenizedBuffer
     else
       null
 
+  indentationForRow: (row) ->
+    state = @stateForRow(row)
+    previousRowText = @buffer.lineForRow(row - 1)
+    @aceMode.getNextLineIndent(state, previousRowText, @tabText)
+
   autoIndentTextAfterBufferPosition: (text, bufferPosition) ->
     { row, column} = bufferPosition
     state = @stateForRow(row)