+** pdf-tools
+#+BEGIN_SRC sh
+ #brew install poppler
+#+END_SRC
+
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ ;(use-package pdf-tools
+ ; :ensure t
+ ; :init
+ ; ;; run to complete the installation
+ ; (pdf-tools-install)
+ ; :config
+ ; (add-to-list 'auto-mode-alist '("\.pdf$" . pdf-view-mode))
+ ; (add-hook 'pdf-outline-buffer-mode-hook #'sd/pdf-outline-map))
+
+ ;(defun sd/pdf-outline-map ()
+ ; "My keybindings in pdf-outline-map"
+ ; (interactive)
+ ; (define-key pdf-outline-buffer-mode-map (kbd "C-o") nil)
+ ; (define-key pdf-outline-buffer-mode-map (kbd "i") 'outline-toggle-children)
+ ; (define-key pdf-outline-buffer-mode-map (kbd "j") 'next-line)
+ ; (define-key pdf-outline-buffer-mode-map (kbd "k") 'previous-line))
+#+END_SRC
+
+** help-mode
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (defun sd/help-mode-hook ()
+ "Mapping for help mode"
+ (define-key help-mode-map "j" 'next-line)
+ (define-key help-mode-map "k" 'previous-line)
+ (define-key help-mode-map "h" 'forward-char)
+ (define-key help-mode-map "l" 'forward-char)
+ (define-key help-mode-map "H" 'describe-mode)
+ (define-key help-mode-map "v" 'recenter-top-bottom)
+ (define-key help-mode-map "i" 'forward-button)
+ (define-key help-mode-map "I" 'backward-button)
+ (define-key help-mode-map "o" 'ace-link-help))
+
+ (add-hook 'help-mode-hook 'sd/help-mode-hook)
+#+END_SRC
+
+Wiki [[http://stackoverflow.com/questions/3480173/show-keys-in-emacs-keymap-value][show-keys-in-emacs-keymap-value]], Helpplus mode can show keymap as human-readable, use ~describe-keymap~ or =C-h M-k=
+
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (el-get-bundle help-macro+
+ :url "https://raw.githubusercontent.com/emacsmirror/emacswiki.org/master/help-macro+.el"
+ :features help-macro+)
+ (el-get-bundle help+
+ :url "https://raw.githubusercontent.com/emacsmirror/emacswiki.org/master/help+.el"
+ :features help+)
+ (el-get-bundle help-fns+
+ :url "https://raw.githubusercontent.com/emacsmirror/emacswiki.org/master/help-fns+.el"
+ :features help-fns+)
+ (el-get-bundle help-mode+
+ :url "https://raw.githubusercontent.com/emacsmirror/emacswiki.org/master/help-mode+.el"
+ :features help-mode+)
+#+END_SRC
+
+** goto-last-change
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (use-package goto-last-change
+ :ensure t)
+#+END_SRC
+
+** Ag
+install =ag=, =the-silver-searcher= by homebrew on mac
+#+BEGIN_SRC sh
+brew install the-silver-searcher
+#+END_SRC
+
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (use-package ag
+ :ensure t)
+#+END_SRC
+
+** Local Variable hooks
+[[https://www.emacswiki.org/emacs/LocalVariables][LocalVariables]], use =hack-local-variables-hook=, run a hook to set local variable in mode hook
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ ;; make Emacs run a new "local variables hook" for each major mode
+ (add-hook 'hack-local-variables-hook 'run-local-vars-mode-hook)
+
+ (defun run-local-vars-mode-hook ()
+ "Run a hook for the major-mode after the local variables have been processed."
+ (run-hooks (intern (concat (symbol-name major-mode) "-local-vars-hook"))))
+
+ ;; (add-hook 'c++-mode-local-vars-hook #'sd/c++-mode-local-vars)
+#+END_SRC
+
+** Table
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (add-hook 'text-mode-hook 'table-recognize)
+#+END_SRC
+
+** url-download
+To download file in =elisp=, best is =url-copy-file=, here refer [[http://stackoverflow.com/questions/4448055/download-a-file-with-emacs-lisp][download-a-file-with-emacs-lisp]] using =url-retrieve-synchronously= wrapping
+as a http download client tool
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (defun sd/download-file (&optional url download-dir download-name)
+ (interactive)
+ (let ((url (or url
+ (read-string "Enter download URL: ")))
+ (download-dir (read-directory-name "Save to (~/Downloads): " "~/Downloads" "~/Downloads" 'confirm' nil)))
+ (let ((download-buffer (url-retrieve-synchronously url)))
+ (save-excursion
+ (set-buffer download-buffer)
+ ;; we may have to trim the http response
+ (goto-char (point-min))
+ (re-search-forward "^$" nil 'move)
+ (forward-char)
+ (delete-region (point-min) (point))
+ (write-file (concat (or download-dir
+ "~/Downloads/")
+ (or download-name
+ (car (last (split-string url "/" t))))))))))
+#+END_SRC
+
+** Elscreen
+Fix one elscreen issue when startup emacs https://github.com/knu/elscreen/issues/6
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ ;; (use-package elscreen
+ ;; :ensure t
+ ;; :init
+ ;; (setq elscreen-tab-display-control nil)
+ ;; :config
+ ;; ;; (elscreen-start)
+ ;; (set-face-attribute 'elscreen-tab-current-screen-face nil :foreground "black" :background "yellow")
+ ;; (set-face-attribute 'elscreen-tab-other-screen-face nil :foreground "black" :background "disabledControlTextColor" :underline nil)
+ ;; ;; (global-unset-key (kbd)); M-TAB switch screen
+ ;; ;; (global-set-key (kbd "s-`") '(lambda () (interactive) (elscreen-goto 0)))
+ ;; ;; (dotimes (i 8)
+ ;; ;; (global-set-key (kbd (concat "s-" (number-to-string (+ i 1))))
+ ;; ;; `(lambda () (interactive) (elscreen-goto ,(+ i 1)))))
+ ;; ;; (global-set-key (kbd "s-t") 'elscreen-create)
+ ;; ;; (global-set-key (kbd "s-n") 'elscreen-next)
+ ;; ;; (global-set-key (kbd "s-p") 'elscreen-previous)
+ ;; )
+#+END_SRC
+
+* Dired
+** Dired bindings