diff --git a/src/emacs/lean-settings.el b/src/emacs/lean-settings.el
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+;; Copyright (c) 2014 Microsoft Corporation. All rights reserved.
+;; Released under Apache 2.0 license as described in the file LICENSE.
+;;
+;; Author: Soonho Kong
+;;
+
+(defgroup lean nil "Lean mode" :prefix 'lean :group 'languages)
+
+(defvar lean-default-executable-name
+  (case system-type
+    ('gnu          "lean")
+    ('gnu/linux    "lean")
+    ('gnu/kfreebsd "lean")
+    ('darwin       "lean")
+    ('ms-dos       "lean")
+    ('windows-nt   "lean.exe")
+    ('cygwin       "lean.exe") ;; TODO(soonhok): check this
+    )
+  "Default executable name of Lean"
+  )
+
+(defcustom lean-rootdir nil
+  "Full pathname of lean root directory. It should be defined by user."
+  :group 'lean
+  :type 'string
+  )
+
+(defcustom lean-executable-name lean-default-executable-name
+  "Name of lean executable"
+  :group 'lean
+  :type 'string
+  )
+
+(defcustom lean-delete-trailing-whitespace nil
+  "Set this variable to true to automatically delete trailing
+whitespace when a buffer is loaded from a file or when it is
+written."
+  :group 'lean
+  :type 'boolean)
+
+(and lean-delete-trailing-whitespace
+     (cond
+      ; If white-space-cleanup-mode exists, use it
+      (((fboundp whitespace-cleanup-mode)
+        (add-hook 'lean-mode-hook 'whitespace-cleanup-mode))
+       ; Otherwise
+       (t (add-hook 'write-file-functions 'whitespace-cleanup)))))
+
+(defcustom lean-rule-column 100
+  "Specify rule-column."
+  :group 'lean
+  :type '(choice (integer :tag "Columns")
+                 (const :tag "Unlimited" nil))
+  :type 'int)
+
+(defcustom lean-show-rule-column-method nil
+  "If enabled, it highlights column"
+  :group 'lean
+  :type '(choice (const :tag "Disabled" nil)
+                 (const :tag "Vertical Line" vline)
+                 ;;(const :tag "Whole Lines" lines)
+                 ;;(const :tag "Only Beyond lean-rule-column" lines-tail)
+                 ))
+
+(provide 'lean-settings)