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~.emacs

 ; display line number (add-to-list 'load-path "~/library/elisp/") (load "linum.el") (require 'linum) (global-linum-mode 1) ; enable erase buffer command (put 'erase-buffer 'disabled nil) ; set tab to 4 space (setq-default indent-tabs-mode nil) (setq-default tab-width 4) ;next

 

 linum.el

http://stud4.tuwien.ac.at/~e0225855/linum/linum.html

;;; linum.el --- Display line numbers to the left of buffers ;; Copyright (C) 2007, 2008 Markus Triska ;; Author: Markus Triska <[email protected]> ;; Keywords: convenience ;; This file 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, or (at your option) ;; any later version. ;; This file 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 GNU Emacs; see the file COPYING. If not, write to ;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, ;; Boston, MA 02110-1301, USA. ;;; Commentary: ;; Display line numbers for the current buffer. Copy linum.el to your ;; load-path and add to your .emacs: ;; (require 'linum) ;; Then toggle display of line numbers with M-x linum-mode. To enable ;; line numbering in all buffers, use M-x global-linum-mode. ;;; Code: (defconst linum-version "0.9wza") (defvar linum-overlays nil "Overlays used in this buffer.") (defvar linum-available nil "Overlays available for reuse.") (defvar linum-before-numbering-hook nil "Functions run in each buffer before line numbering starts.") (mapc #'make-variable-buffer-local '(linum-overlays linum-available)) (defgroup linum nil "Show line numbers to the left of buffers" :group 'convenience) ;;;###autoload (defcustom linum-format 'dynamic "Format used to display line numbers. Either a format string like /"%7d/", 'dynamic to adapt the width as needed, or a function that is called with a line number as its argument and should evaluate to a string to be shown on that line. See also `linum-before-numbering-hook'." :group 'linum :type 'sexp) (defface linum '((t :inherit (shadow default))) "Face for displaying line numbers in the display margin." :group 'linum) (defcustom linum-eager t "Whether line numbers should be updated after each command. The conservative setting `nil' might miss some buffer changes, and you have to scroll or press C-l to update the numbers." :group 'linum :type 'boolean) (defcustom linum-delay nil "Delay updates to give Emacs a chance for other changes." :group 'linum :type 'boolean) ;;;###autoload (define-minor-mode linum-mode "Toggle display of line numbers in the left marginal area." :lighter "" ; for desktop.el (if linum-mode (progn (if linum-eager (add-hook 'post-command-hook (if linum-delay 'linum-schedule 'linum-update-current) nil t) (add-hook 'after-change-functions 'linum-after-change nil t)) (add-hook 'window-scroll-functions 'linum-after-scroll nil t) ;; mistake in Emacs: window-size-change-functions cannot be local (add-hook 'window-size-change-functions 'linum-after-size) (add-hook 'change-major-mode-hook 'linum-delete-overlays nil t) (add-hook 'window-configuration-change-hook 'linum-after-config nil t) (linum-update-current)) (remove-hook 'post-command-hook 'linum-update-current t) (remove-hook 'post-command-hook 'linum-schedule t) (remove-hook 'window-size-change-functions 'linum-after-size) (remove-hook 'window-scroll-functions 'linum-after-scroll t) (remove-hook 'after-change-functions 'linum-after-change t) (remove-hook 'window-configuration-change-hook 'linum-after-config t) (remove-hook 'change-major-mode-hook 'linum-delete-overlays t) (linum-delete-overlays))) ;;;###autoload (define-globalized-minor-mode global-linum-mode linum-mode linum-on) (defun linum-on () (unless (minibufferp) (linum-mode 1))) (defun linum-delete-overlays () "Delete all overlays displaying line numbers for this buffer." (mapc #'delete-overlay linum-overlays) (setq linum-overlays nil) (dolist (w (get-buffer-window-list (current-buffer) nil t)) (set-window-margins w 0))) (defun linum-update-current () "Update line numbers for the current buffer." (linum-update (current-buffer))) (defun linum-update (buffer) "Update line numbers for all windows displaying BUFFER." (with-current-buffer buffer (when linum-mode (setq linum-available linum-overlays) (setq linum-overlays nil) (save-excursion (mapc #'linum-update-window (get-buffer-window-list buffer nil 'visible))) (mapc #'delete-overlay linum-available) (setq linum-available nil)))) (defun linum-update-window (win) "Update line numbers for the portion visible in window WIN." (goto-char (window-start win)) (let ((line (line-number-at-pos)) (limit (window-end win t)) (fmt (cond ((stringp linum-format) linum-format) ((eq linum-format 'dynamic) (let ((w (length (number-to-string (count-lines (point-min) (point-max)))))) (concat "%" (number-to-string w) "d"))))) (width 0)) (run-hooks 'linum-before-numbering-hook) ;; Create an overlay (or reuse an existing one) for each ;; line visible in this window, if necessary. (while (and (not (eobp)) (<= (point) limit)) (let* ((str (if fmt (propertize (format fmt line) 'face 'linum) (funcall linum-format line))) (visited (catch 'visited (dolist (o (overlays-in (point) (point))) (when (string= (overlay-get o 'linum-str) str) (unless (memq o linum-overlays) (push o linum-overlays)) (setq linum-available (delete o linum-available)) (throw 'visited t)))))) (setq width (max width (length str))) (unless visited (let ((ov (if (null linum-available) (make-overlay (point) (point)) (move-overlay (pop linum-available) (point) (point))))) (push ov linum-overlays) (overlay-put ov 'before-string (propertize " " 'display `((margin left-margin) ,str))) (overlay-put ov 'linum-str str)))) (forward-line) (setq line (1+ line))) (set-window-margins win width))) (defun linum-after-change (beg end len) ;; update overlays on deletions, and after newlines are inserted (when (or (= beg end) (= end (point-max)) ;; TODO: use string-match-p with CVS or new release (string-match "/n" (buffer-substring-no-properties beg end))) (linum-update-current))) (defun linum-after-scroll (win start) (linum-update (window-buffer win))) (defun linum-after-size (frame) (linum-after-config)) (defun linum-schedule () ;; schedule an update; the delay gives Emacs a chance for display changes (run-with-idle-timer 0 nil #'linum-update-current)) (defun linum-after-config () (walk-windows (lambda (w) (linum-update (window-buffer w))) nil 'visible)) (provide 'linum) ;;; linum.el ends here