/usr/share/emacs/site-lisp/emacs-goodies-el/show-wspace.el is in emacs-goodies-el 35.12.
This file is owned by root:root, with mode 0o655.
The actual contents of the file can be viewed below.
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;;
;; Filename: show-wspace.el
;; Description: Highlight whitespace of various kinds.
;; Author: Peter Steiner <unistein@isbe.ch>, Drew Adams
;; Maintainer: Drew Adams
;; Copyright (C) 2000-2009, Drew Adams, all rights reserved.
;; Created: Wed Jun 21 08:54:53 2000
;; Version: 21.0
;; Last-Updated: Sat Aug 1 15:42:17 2009 (-0700)
;; By: dradams
;; Update #: 282
;; URL: http://www.emacswiki.org/cgi-bin/wiki/show-wspace.el
;; Keywords: highlight, whitespace
;; Compatibility: GNU Emacs: 20.x, 21.x, 22.x, 23.x
;;
;; Features that might be required by this library:
;;
;; None
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Commentary:
;;
;; Highlight whitespace of various kinds.
;;
;; To use this library:
;;
;; Add this to your initialization file (~/.emacs or ~/_emacs):
;;
;; (require 'show-wspace) ; Load this library.
;;
;; Then you can use commands `toggle-*' (see below) to turn the
;; various kinds of whitespace highlighting on and off in Font-Lock
;; mode.
;;
;; If you want to always use a particular kind of whitespace
;; highlighting, by default, then add the corresponding
;; `show-ws-highlight-*' function (see below) to the hook
;; `font-lock-mode-hook'. Then, whenever Font-Lock mode is turned on,
;; whitespace highlighting will also be turned on.
;;
;; For example, you can turn on tab highlighting by default by adding
;; function `show-ws-highlight-tabs' to `font-lock-mode-hook' in your
;; .emacs file, as follows:
;;
;; (add-hook 'font-lock-mode-hook 'show-ws-highlight-tabs)
;;
;;
;; Faces defined here:
;;
;; `show-ws-hard-space', `show-ws-tab', `show-ws-trailing-whitespace'.
;;
;; Commands defined here:
;;
;; `show-ws-toggle-show-hard-spaces', `show-ws-toggle-show-tabs',
;; `show-ws-toggle-show-trailing-whitespace',
;; `toggle-show-hard-spaces-show-ws' (alias),
;; `toggle-show-tabs-show-ws' (alias),
;; `toggle-show-trailing-whitespace-show-ws' (alias).
;;
;; Non-interactive functions defined here:
;;
;; `show-ws-dont-highlight-hard-spaces',
;; `show-ws-dont-highlight-tabs',
;; `show-ws-dont-highlight-trailing-whitespace',
;; `show-ws-highlight-hard-spaces', `show-ws-highlight-tabs',
;; `show-ws-highlight-trailing-whitespace'.
;;
;; Internal variables defined here:
;;
;; `show-ws-highlight-hard-spaces-p', `show-ws-highlight-tabs-p',
;; `show-ws-highlight-trailing-whitespace-p'.
;;
;; Drew Adams wrote the `toggle-*' commands and `*-p' variables.
;;
;; Peter Steiner wrote the original code that did the equivalent of
;; the `show-ws-highlight-*' commands here in his `hilite-trail.el'.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Change log:
;;
;; 2009/06/25 dadams
;; show-ws-dont-*: Should be no-op's for Emacs 20, 21.
;; 2009/06/17 dadams
;; Added: show-ws-dont-highlight-*.
;; show-ws-toggle-show-*: Remove the font-lock keywords. Needed for Emacs 22+.
;; 2007/09/25 dadams
;; Renamed to use prefix show-ws-. Thx to Cyril Brulebois.
;; 2006/11/11 dadams
;; Corrected doc strings. Clarified: hard space is non-breaking space, \240.
;; Included hard space in highlight-trailing-whitespace.
;; 2006/04/06 dadams
;; highlight-*: Use font-lock-add-keywords. Thanks to Karl Chen.
;; 2006/02/20 dadams
;; Mentioned in Commentary how to use non-interactively.
;; 2006/01/07 dadams
;; Added :link for sending bug report.
;; 2006/01/06 dadams
;; Added defgroup and use it.
;; 2005/12/30 dadams
;; Removed require of def-face-const.el.
;; Renamed faces, without "-face".
;; 2005/01/25 dadams
;; Removed ###autoload for defvars.
;; 2004/06/10 dadams
;; Fixed minor bug in highlight-* functions.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; 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 2, 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; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth
;; Floor, Boston, MA 02110-1301, USA.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Code:
(and (< emacs-major-version 20) (eval-when-compile (require 'cl))) ;; when, push
;;;;;;;;;;;;;;;;;;;;;;;;;
(defgroup Show-Whitespace nil
"Highlight whitespace of various kinds."
:prefix "show-ws-"
:group 'convenience :group 'matching
:link `(url-link :tag "Send Bug Report"
,(concat "mailto:" "drew.adams" "@" "oracle" ".com?subject=\
show-wspace.el bug: \
&body=Describe bug here, starting with `emacs -q'. \
Don't forget to mention your Emacs and library versions."))
:link '(url-link :tag "Other Libraries by Drew"
"http://www.emacswiki.org/cgi-bin/wiki/DrewsElispLibraries")
:link '(url-link :tag "Download"
"http://www.emacswiki.org/cgi-bin/wiki/show-wspace.el")
:link '(url-link :tag "Description"
"http://www.emacswiki.org/cgi-bin/wiki/ShowWhiteSpace#ShowWspace")
:link '(emacs-commentary-link :tag "Commentary" "show-wspace")
)
(defface show-ws-tab '((t (:background "LemonChiffon")))
"*Face for highlighting tab characters (`C-i') in Font-Lock mode."
:group 'Show-Whitespace :group 'font-lock :group 'faces)
(defface show-ws-trailing-whitespace '((t (:background "Gold")))
"*Face for highlighting whitespace at line ends in Font-Lock mode."
:group 'Show-Whitespace :group 'font-lock :group 'faces)
(defface show-ws-hard-space '((t (:background "PaleGreen")))
"*Face for highlighting non-breaking spaces (`\240')in Font-Lock mode."
:group 'Show-Whitespace :group 'font-lock :group 'faces)
(defvar show-ws-highlight-tabs-p nil
"Non-nil means font-lock mode highlights TAB characters (`C-i').")
(defvar show-ws-highlight-trailing-whitespace-p nil
"Non-nil means font-lock mode highlights whitespace at line ends.")
(defvar show-ws-highlight-hard-spaces-p nil
"Non-nil means font-lock mode highlights non-breaking spaces (`\240').")
;;;###autoload
(defalias 'toggle-show-tabs-show-ws 'show-ws-toggle-show-tabs)
;;;###autoload
(defun show-ws-toggle-show-tabs ()
"Toggle highlighting of TABs, using face `show-ws-tab'."
(interactive)
(setq show-ws-highlight-tabs-p (not show-ws-highlight-tabs-p))
(if show-ws-highlight-tabs-p
(add-hook 'font-lock-mode-hook 'show-ws-highlight-tabs)
(remove-hook 'font-lock-mode-hook 'show-ws-highlight-tabs)
(show-ws-dont-highlight-tabs))
(font-lock-mode) (font-lock-mode)
(message "TAB highlighting is now %s." (if show-ws-highlight-tabs-p "ON" "OFF")))
;;;###autoload
(defalias 'toggle-show-hard-spaces-show-ws 'show-ws-toggle-show-hard-spaces)
;;;###autoload
(defun show-ws-toggle-show-hard-spaces ()
"Toggle highlighting of non-breaking space characters (`\240').
Uses face `show-ws-hard-space'."
(interactive)
(setq show-ws-highlight-hard-spaces-p (not show-ws-highlight-hard-spaces-p))
(if show-ws-highlight-hard-spaces-p
(add-hook 'font-lock-mode-hook 'show-ws-highlight-hard-spaces)
(remove-hook 'font-lock-mode-hook 'show-ws-highlight-hard-spaces)
(show-ws-dont-highlight-hard-spaces))
(font-lock-mode) (font-lock-mode)
(message "Hard (non-breaking) space highlighting is now %s."
(if show-ws-highlight-hard-spaces-p "ON" "OFF")))
;;;###autoload
(defalias 'toggle-show-trailing-whitespace-show-ws
'show-ws-toggle-show-trailing-whitespace)
;;;###autoload
(defun show-ws-toggle-show-trailing-whitespace ()
"Toggle highlighting of trailing whitespace.
Uses face `show-ws-trailing-whitespace'."
(interactive)
(setq show-ws-highlight-trailing-whitespace-p
(not show-ws-highlight-trailing-whitespace-p))
(if show-ws-highlight-trailing-whitespace-p
(add-hook 'font-lock-mode-hook 'show-ws-highlight-trailing-whitespace)
(remove-hook 'font-lock-mode-hook 'show-ws-highlight-trailing-whitespace)
(show-ws-dont-highlight-trailing-whitespace))
(font-lock-mode) (font-lock-mode)
(message "Trailing whitespace highlighting is now %s."
(if show-ws-highlight-trailing-whitespace-p "ON" "OFF")))
(defun show-ws-highlight-tabs ()
"Highlight tab characters (`C-i')."
(font-lock-add-keywords nil '(("[\t]+" (0 'show-ws-tab t)))))
(defun show-ws-highlight-hard-spaces ()
"Highlight hard (non-breaking) space characters (`\240')."
(font-lock-add-keywords nil '(("[\240]+" (0 'show-ws-hard-space t)))))
(defun show-ws-highlight-trailing-whitespace ()
"Highlight whitespace characters at line ends."
(font-lock-add-keywords
nil '(("[\240\040\t]+$" (0 'show-ws-trailing-whitespace t)))))
;; These are no-ops for Emacs 20, 21:
;; `font-lock-remove-keywords' is not defined, and we don't need to use it.
(defun show-ws-dont-highlight-tabs ()
"Don't highlight tab characters (`C-i')."
(when (fboundp 'font-lock-remove-keywords)
(font-lock-remove-keywords nil '(("[\t]+" (0 'show-ws-tab t))))))
(defun show-ws-dont-highlight-hard-spaces ()
"Don't highlight hard (non-breaking) space characters (`\240')."
(when (fboundp 'font-lock-remove-keywords)
(font-lock-remove-keywords nil '(("[\240]+" (0 'show-ws-hard-space t))))))
(defun show-ws-dont-highlight-trailing-whitespace ()
"Don't highlight whitespace characters at line ends."
(when (fboundp 'font-lock-remove-keywords)
(font-lock-remove-keywords
nil '(("[\240\040\t]+$" (0 'show-ws-trailing-whitespace t))))))
;;;;;;;;;;;;;;;;;;;;;;;
(provide 'show-wspace)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; show-wspace.el ends here
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