Add emacs interface

Only has a `gitto-register' function for now.  Just a start.

emacs/gitto.el

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+;;; gitto.el --- Gitto in emacs
+
+;; Copyright (C) 2012  Tom Willemsen
+
+;; Author: Tom Willemsen <thomas@aethon.nl>
+;; Keywords: convenience
+;; Package-Version: 0.1.0
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Small interface between gitto and emacs.
+
+;;; Code:
+
+(defgroup gitto nil
+  "Gitto settings."
+  :group 'applications)
+
+(defcustom gitto-program "gitto"
+  "The gitto executable."
+  :group 'gitto
+  :type 'string)
+
+;;;###autoload
+(defun gitto-register (dir)
+  (interactive (list (locate-dominating-file (buffer-file-name) ".git")))
+  (unless dir
+    (error "Not a git repository."))
+
+  (shell-command (concat gitto-program " -r " dir)))
+
+(provide 'gitto)
+;;; gitto.el ends here