+ (global-set-key (kbd "s-u") 'undo-tree-visualize)
+#+END_SRC
+
+*** flyspell
+Stolen from [[https://github.com/redguardtoo/emacs.d/blob/master/lisp/init-spelling.el][here]], hunspell will search dictionary in =DICPATH=
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (setenv "DICPATH" "/usr/local/share/hunspell")
+
+ (when (executable-find "hunspell")
+ (setq-default ispell-program-name "hunspell")
+ (setq ispell-really-hunspell t))
+
+ ;; (defun text-mode-hook-setup ()
+ ;; ;; Turn off RUN-TOGETHER option when spell check text-mode
+ ;; (setq-local ispell-extra-args (flyspell-detect-ispell-args)))
+ ;; (add-hook 'text-mode-hook 'text-mode-hook-setup)
+ ;; (add-hook 'text-mode-hook 'flyspell-mode)
+
+ ;; enable flyspell check on comments and strings in progmamming modes
+ ;; (add-hook 'prog-mode-hook 'flyspell-prog-mode)
+
+ ;; I don't use the default mappings
+ (with-eval-after-load 'flyspell
+ (define-key flyspell-mode-map (kbd "C-;") nil)
+ (define-key flyspell-mode-map (kbd "C-,") nil)
+ (define-key flyspell-mode-map (kbd "C-.") nil))
+#+END_SRC
+
+Make flyspell enabled for org-mode, see [[http://emacs.stackexchange.com/questions/9333/how-does-one-use-flyspell-in-org-buffers-without-flyspell-triggering-on-tangled][here]]
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ ;; NO spell check for embedded snippets
+ (defadvice org-mode-flyspell-verify (after org-mode-flyspell-verify-hack activate)
+ (let ((rlt ad-return-value)
+ (begin-regexp "^[ \t]*#\\+begin_\\(src\\|html\\|latex\\)")
+ (end-regexp "^[ \t]*#\\+end_\\(src\\|html\\|latex\\)")
+ old-flag
+ b e)
+ (when ad-return-value
+ (save-excursion
+ (setq old-flag case-fold-search)
+ (setq case-fold-search t)
+ (setq b (re-search-backward begin-regexp nil t))
+ (if b (setq e (re-search-forward end-regexp nil t)))
+ (setq case-fold-search old-flag))
+ (if (and b e (< (point) e)) (setq rlt nil)))
+ (setq ad-return-value rlt)))
+#+END_SRC
+
+** Search & Replace / hightlight =M-s=
+*** isearch
+=C-s=, =C-r=,
+=C-w= add word at point to search string,
+=M-%= query replace
+=C-M-y= add character at point to search string
+=M-s C-e= add reset of line at point
+=C-y= yank from clipboard to search string
+=M-n=, =M-p=, history
+=C-M-i= complete search string
+set the isearch history size, the default is only =16=
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (setq history-length 5000)
+ (setq regexp-search-ring-max 1000)
+ (setq search-ring-max 1000)
+
+ ;; when search a word or a symbol , also add the word into regexp-search-ring
+ (defadvice isearch-update-ring (after sd/isearch-update-ring (string &optional regexp) activate)
+ "Add search-ring to regexp-search-ring"
+ (unless regexp
+ (add-to-history 'regexp-search-ring string regexp-search-ring-max)))
+#+END_SRC
+
+*** =M-s= prefix
+use the prefix =M-s= for searching in buffers
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (defun sd/make-keymap (key bindings)
+ (setq keymap (make-sparse-keymap))
+ (dolist (binding bindings)
+ (define-key keymap (car binding) (cdr binding)))
+ (global-set-key key keymap))