+;(require 'init-project)
+;(require 'init-ggtags)
+
+;(require 'init-projectile)
+
+;;;; conflict with C-c . in org-mode, disable it temporarily
+;;;;(require 'init-c-cpp)
+;(require 'init-key-binding)
+;(require 'init-winner)
+;(require 'init-minibuffer)
+;(require 'init-eshell)
+
+;; http://stackoverflow.com/questions/11484225/fix-an-auto-complete-mode-and-linum-mode-annoyance
+;;;(ac-linum-workaround)
+
+
+;(require 'init-mode-line)
+;(require 'init-workgroup2)
+;(require 'init-perl)
+
+;(add-to-list 'load-path "~/.emacs.d/Emacs-PDE-0.2.16/lisp/")
+;(load "pde-load") ;
+
+;(require 'init-linum)
+
+;(require 'auto-complete)
+;(require 'auto-complete-config)
+;(ac-config-default)
+
+
+
+
+;; page break configuration
+;(require 'pp-c-l)
+;(pretty-control-l-mode 1)
+
+;; persist command history of helm
+;(require 'session)
+;(add-hook 'after-init-hook 'session-initialize)
+
+
+;(require 'use-package)
+
+;; persist command history of helm
+;(use-package savehist
+; :init (savehist-mode)
+; :config
+; (setq history-length 1000
+; history-delete-duplicates t
+; savehist-additional-variables '(extended-command-history)))
+
+;;(savehist-mode)
+;; (setq history-length 1000
+;; history-delete-duplicates t
+;; savehist-additional-variables '(extended-command-history))
+
+; (setq split-height-threshold 0)