From c3dc1cc3ebb62354fadc3045f9ecf1caa76aa010 Mon Sep 17 00:00:00 2001
From: Chris Wanstrath <chris@ozmm.org>
Date: Thu, 8 Sep 2011 00:37:40 -0700
Subject: [PATCH] detect indentation, tabs vs spaces

---
 src/editor.coffee | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/editor.coffee b/src/editor.coffee
index 99fde6c35..be36bdabb 100644
--- a/src/editor.coffee
+++ b/src/editor.coffee
@@ -105,8 +105,18 @@ class Editor extends Pane
   newSession: (code) ->
     doc = new EditSession code or ''
     doc.setUndoManager new UndoManager
+    doc.setUseSoftTabs useSoftTabs = @usesSoftTabs code
+    doc.setTabSize if useSoftTabs then @guessTabSize code else 8
     doc
 
+  usesSoftTabs: (code) ->
+    not /^\t/m.test code or @code()
+
+  guessTabSize: (code) ->
+    # * ignores indentation of css/js block comments
+    match = /^( +)[^*]/im.exec code || @code()
+    match?[1].length or 2
+
   copy: ->
     editor = @ace
     text = editor.getSession().doc.getTextRange editor.getSelectionRange()