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diff --git a/lisp/ravi-init-maps.el b/lisp/ravi-init-maps.el
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+;;; ravi-init-maps.el --- extra keys                 -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2015  Ravi R Kiran
+
+;; Author:  <ravi@nero.lan>
+;; Keywords:
+
+;; 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:
+
+;; Extra keybindings
+
+(use-package hydra
+  :ensure t)
+
+(use-package operate-on-number
+  :bind (("M-g M-d" . hydra-operate-on-number/body))
+  :config
+  (progn
+    (defhydra hydra-operate-on-number ()
+      "
+    Arithmetic operations: + - * /
+    Remainder: \\
+    Exponent: \\^
+    Arithmetic shift: < >
+    Base conversion: b o x X #
+    Format: %%%%
+    "
+      ("+" apply-operation-to-number-at-point)
+      ("-" apply-operation-to-number-at-point)
+      ("*" apply-operation-to-number-at-point)
+      ("/" apply-operation-to-number-at-point)
+      ("\\" apply-operation-to-number-at-point)
+      ("^" apply-operation-to-number-at-point)
+      ("<" apply-operation-to-number-at-point)
+      (">" apply-operation-to-number-at-point)
+      ("b" apply-operation-to-number-at-point :exit t)
+      ("o" apply-operation-to-number-at-point :exit t)
+      ("x" apply-operation-to-number-at-point :exit t)
+      ("X" apply-operation-to-number-at-point :exit t)
+      ("#" apply-operation-to-number-at-point :exit t)
+      ("%" apply-operation-to-number-at-point :exit t)))
+  :ensure t)
+
+(provide 'ravi-init-maps)
+;;; ravi-init-maps.el ends here