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highlight-tail.el (v1.0) --- draw a "tail" while writing, by smoothly ch

From: Rafal Jedruszek
Subject: highlight-tail.el (v1.0) --- draw a "tail" while writing, by smoothly changing background color
Date: Sat, 01 Jan 2005 17:03:53 +0100
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)


The webpage of highlight-tail mode is down for indeterminate
time, so I decided to post it here, so everyone can find latest
version.  There is nothing new in 1.0, I just think 0.9.3 is so
stable to honor it with round version number.

;;; highlight-tail.el --- draw a "tail" while writing, by smoothly changing 
background color

;; Author: Rafal Jedruszek <address@hidden>
;; Keywords: highlight tail eye-candy visual-effect light color burn
;; Favourite-brand-of-beer: None, I hate beer.
;; Webpage: 
;; Webpage is down for indeterminate time! (01.01.05)

(defconst highlight-tail-version "1.0" "The current version of 

;; This file is not part of GNU Emacs.

;; 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
;; 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; === WHAT IS IT?
;; This minor-mode draws a tail in real time, when you write.  It
;; changes the background color of some last typed characters and
;; smoothly fade them out to the given color (probably the background
;; color).
;; So from now on, your EMACS will be even more sexy! ;o )
;; Place this file in your load-path and add
;; (require 'highlight-tail-mode)
;; (message "Highlight-tail-mode loaded - now your Emacs will be even more 
;; ; [ here some setq of variables ]
;; (highlight-tail-reload)
;; to your ~/.emacs
;; The default configuration is quite good, but you could and should
;; customize it to your own needs.  Here are some examples.  It's hard
;; for me to explain what you will see when use them, so just give them
;; them a try.  Place theese setq in your .emacs.el file *before* the
;; (highlight-tail-reload) function call.
;; 1. -----
;; (setq highlight-tail-colors '(("black" . 0)
;;                               ("#bc2525" . 25)
;;                               ("black" . 100)))
;; 2. -----
;; (setq highlight-tail-steps 14
;;       highlight-tail-timer 1)
;; 3. -----
;; (setq highlight-tail-posterior-type 'const)
;; Theese are all customizable variables.  I think you get the idea
;; how to customize this mode for best fit.
;; You will often need to run (highlight-tail-reload) to make changes
;; work.
;; === SPEED
;; From version 0.8 this mode doesn't use much CPU power.  There were
;; problems with this in earlier versions.  Now it takes about 2-8% of
;; my Athlon XP 2000+ power in normal speed typing (maybe it is still
;; too much? - if you have suggestions how to make it eat less - mail
;; me).  When I press a key and hold it down it eats approximately 15%
;; (in comparison to prior version (100%) it is a very good result).
;; The CPU eaten depends mainly on two variables:
;; `highlight-tail-steps' and `highlight-tail-timer'.  So combine with
;; theese two to achieve satisfactory performance.
;; === X11
;; You should run highlight-tail-mode under X11, not in console nor terminal
;; emulator, because results will be miserable.

;;; History:

;; * 1.0
;;      + Nothing new, I just think 0.9.3 is so stable to honor it with
;;        round version number.
;; * 0.9.3
;;      + Added information about highlight-tail.el webpage.
;;      + Front highlighting removed completely... It wasn't nice and
;;        there were too many troubles with it.
;;      + highlight-tail.el taken under subversion control
;; * 0.9.2
;;      + Colors can be passed with uppercase letters in.
;;      + If you choose a color, that doesn't exist in `color-name-rgb-alist',
;;        mode will call out an error instead of running "illegible" debugger 
;;      + The variable (i)timer-list is now cleaned from old timers on
;;        `highlight-tail-reload' call.
;;      + All overlays are deleted on `highlight-tail-reload' call.
;;      + Several minor bugs fixed.
;; * 0.9.1
;;      + Region kept alive in Xemacs, when going to the end of line.
;;        Thanks to Nate Drake for reporting this bug.
;;      + Functions broken into smaller parts.
;; * 0.9
;;      + Now under GPL.
;;      + Changed start, middle and end colors to a list of indefinable length
;;      + Added front and constant highlighting options.
;;      + Changed lists to hashes and vectors for speed (I don't really know
;;        did this help.)
;; * 0.8
;;      + Eats a lot less of CPU cycles than before.  Thanks to
;;        Phillip Lord for some advices how to achieve it.
;;      + Works good under xemacs.
;;      + Added middle color option
;; * 0.7
;;      + First public version.

;;; TODO:

;; * Maybe some optimizations for speed.
;; You are free to mail me, what would you like to see in this
;; mode, or maybe you have idea for new emacs eye-candy minor-mode.
;; address@hidden

;;; Variables:

(defvar highlight-tail-colors-fade-table nil
  "The list of colors for fading out.
This list is computed on every reload by
function `highlight-tail-make-colors-fade-table'.

Please do not change this variable.")

(defvar highlight-tail-colors '(("#bc2525" . 0)
                                ("#000000" . 100))
  "*List of colors through which the fading will last.
The argument for every color is a percent at which this color
will have greatest intensity.

For instance:
'((\"#bc2525\" . 0)
  (\"#000000\" . 100))

Verbal color names are possible if variable `color-name-rgb-alist'
exists (it usually exists in Emacs, not in Xemacs).  Theese names are
case independent.

For instance:
'((\"Black\" . 0)
  (\"white\" . 100))")

(defvar highlight-tail-steps 80
  "*Number of fading out steps.
The color will be changed that many times until
it will reach last color from `highlight-tail-colors'.")

(defvar highlight-tail-timer 0.04
  "*Number of seconds between fade out steps.
It can be sth like this: 0.2 or maybe better 0.02")

(defvar highlight-tail-posterior-type 't
  "*Type of highlighting.
t      - normal highlighting
const  - highlight constant width of characters
         (see `highlight-tail-const-width')
nil    - do not highlight the back (posterior) at all")

(defvar highlight-tail-const-width 10
  "*Number of chars to highlight when constant highlighting.
Makes sense only when `highlight-tail-posterior-type' is const.")

(defvar highlight-tail-overlays-list nil
  "Hash of actually being displayed overlays and their colors.
The hash consists of lists like this one: (overlay . color).
Color is a number from which parser will build a face name.
For example color number 5 will amount to \"highlight-tail-face-5\".
The list is changed on every `highlight-tail-process-overlays-list' call.

Please do not change this variable.")

(defvar highlight-tail-const-overlays-list nil
  "Vector of overlays and their colors, when constant highlighting is on.
\(note `highlight-tail-posterior-type')
The vector consists of lists like this one: (overlay . color).
Color is a number from which parser will build a face name.
For example color number 5 will amount to \"highlight-tail-face-5\".
The list is changed on every `highlight-tail-process-overlays-list' call.

Please do not change this variable.")

(defvar highlight-tail-update-const-overlays-to-this-list nil
  "Original colors of overlays when const highlighting is on.
\(see `highlight-tail-posterior-type' variable).
The `highlight-tail-const-overlays-list' will be smoothly changed to this
variable on few keypresses.

Please do not change this variable.")

(defvar highlight-tail-face-max nil
  "Number of \"max face\" computed by `highlight-tail-make-faces'.
Max face means the color completely faded out.

Please do not change this variable.")

(defvar highlight-tail-current-buffer nil
  "Buffer where highlighting is being done.

Please do not change this variable.")

(defvar highlight-tail-internal-timer nil
  "Timer that executes color changing.
Every tick of this timer will change colors of overlays.
This variable is attributed in the program.

Please do not change this variable.")

(defvar highlight-tail-mode nil
  "*The highlight-tail-mode state.")

;;; Code:

(defun highlight-tail-post-command ()
  "Check for the last command and decide to refresh highlighting or not."
  (when (and highlight-tail-mode
             (equal this-command 'self-insert-command))

(defun highlight-tail-make-new-overlays ()
  "Highlight places (make/move overlays) where they should be highlighted.
It is called on every `self-insert-command'."
  ;; if the mode had been just reactivated or sth like that
  (unless (member highlight-tail-internal-timer timer-list)
  ;; done

(defun highlight-tail-make-new-overlays-posterior ()
  "Create or update posterior overlays.
This is called by `highlight-tail-make-new-overlays'."
  (when highlight-tail-posterior-type
    (if (eq highlight-tail-posterior-type 'const)
          ;; first run - make overlays
          (unless highlight-tail-const-overlays-list
          ;; done
      ;; not const highlighting - make new overlay in the current place
      ;; with face-value of 0 (brightest)

(defun highlight-tail-make-new-overlay ()
  "Make new highlight in the current point with highest intensity."
  (let* ((end-point (point))
         (start-point (1- end-point))
         (face-number 0))
    (when (gethash start-point highlight-tail-overlays-list)
      (highlight-tail-delete-overlay (car (gethash start-point 
      (remhash start-point highlight-tail-overlays-list))
    (puthash start-point
             (cons (highlight-tail-make-overlay start-point end-point)
    (let ((overlay-address (car (gethash start-point
      (highlight-tail-overlay-put overlay-address 'evaporate t)
      (highlight-tail-overlay-put overlay-address 'face (intern

(defun highlight-tail-make-const-overlays-list ()
  "Make constant overlays list, that will be later operated on.
Will be operated by `highlight-tail-process-overlays-list'
\(change colors etc.)

It only occurs when `highlight-tail-posterior-type' is 'const."
  (let* ((const-char (1- highlight-tail-const-width))
         (face-indicator (/ highlight-tail-face-max
                            (float (1+ const-char)))))
    (setq highlight-tail-const-overlays-list (make-vector 
    (setq highlight-tail-update-const-overlays-to-this-list
          (make-vector highlight-tail-const-width
    ;; we are going from end
    (while (>= const-char 0)
      (let ((multiply-fc-fi (round (* const-char face-indicator))))
        (aset highlight-tail-const-overlays-list
              (cons (highlight-tail-make-overlay (point) (point))
        (aset highlight-tail-update-const-overlays-to-this-list
        (highlight-tail-overlay-put (car (elt 
highlight-tail-const-overlays-list const-char))
                                    'face (intern
        (setq const-char (1- const-char))))))

(defun highlight-tail-update-const-overlays-list ()
  "Update constant overlays list (colors, positions etc.)

It only occurs when `highlight-tail-posterior-type' is 'const."
  (let ((count 0))
    (while (< count (length highlight-tail-const-overlays-list))
      (let ((const-place (- (point) count)))
        (if (< (- (point) const-place)
            (highlight-tail-move-overlay (car (elt 
highlight-tail-const-overlays-list count))
                                         const-place (1- const-place)
          ;; move to current-buffer to not blink in other buffer
          ;; it is good for minibuffer
          (highlight-tail-move-overlay (car (elt 
highlight-tail-const-overlays-list count))
                                       1 1
      (let ((new-value (round (- (cdr (elt highlight-tail-const-overlays-list 
                                 (* (- highlight-tail-face-max
highlight-tail-update-const-overlays-to-this-list count))
        (if (< new-value (elt highlight-tail-update-const-overlays-to-this-list 
            (setq new-value (elt 
highlight-tail-update-const-overlays-to-this-list count)))
        (setcdr (elt highlight-tail-const-overlays-list count) new-value))
      (setq count (1+ count)))))

(defun highlight-tail-process-overlays-list ()
  "Go through all overlays and make sth with them.
Such as compute new faces, purge old overlays etc.

This is called every `highlight-tail-timer' amount of time."
  (sit-for 0)
  ;; if mode had been just disabled - delete all overlays
  ;; and cancel the timer
  (if (not highlight-tail-mode)

  ;; if there are some overlays
  (when highlight-tail-posterior-type

(defun highlight-tail-process-overlays-list-posterior ()
  "Process posterior overlays.
This is called by `highlight-tail-process-overlays-list'."
  (if (eq highlight-tail-posterior-type 'const)
      ;; list of const overlays
      (when highlight-tail-const-overlays-list
        (let ((count 0))
          (while (< count highlight-tail-const-width)
            (let ((cur-face-number (cdr (elt highlight-tail-const-overlays-list 
              ;; number < `highlight-tail-face-max'
              (if (not (= cur-face-number
                    (setq cur-face-number (1+ cur-face-number))
                    (setcdr (elt highlight-tail-const-overlays-list count)
                    (highlight-tail-overlay-put (car (elt 
highlight-tail-const-overlays-list count))
                                                 (concat "highlight-tail-face-"
                (highlight-tail-move-overlay (car (elt 
highlight-tail-const-overlays-list count))
                                             1 1

              (setq count (1+ count))))))
    ;; if not const highlighting
    (when highlight-tail-overlays-list
      (maphash 'highlight-tail-overlays-list-hash-process

(defun highlight-tail-overlays-list-hash-process (key value)
  "Process every KEY in `highlight-tail-overlays-list'."
  (let ((cur-face-number (cdr value)))
    (if (not (= cur-face-number
          (setq cur-face-number (1+ cur-face-number))
          (setcdr value cur-face-number)
          (highlight-tail-overlay-put (car value)
                                       (concat "highlight-tail-face-"
      ;; number == `highlight-tail-face-max'
        (highlight-tail-delete-overlay (car value))
        (remhash key highlight-tail-overlays-list)))))

(defun highlight-tail-make-colors-fade-table ()
  "Compute a list of colors that will smoothly change from one to another.
The list is stored in variable `highlight-tail-colors-fade-table'.

Look at `highlight-tail-colors' too."
  (let ((count 1))
    (setq highlight-tail-colors-fade-table 'nil)
    (while (< count (length highlight-tail-colors))
      (let ((steps (- (* (/ (float (cdr (nth count highlight-tail-colors)))
                      (* (/ (float (cdr (nth (1- count) highlight-tail-colors)))
        (setq highlight-tail-colors-fade-table
              (append (highlight-tail-find-colors-list
                       (car (nth (1- count) highlight-tail-colors))
                       (car (nth count highlight-tail-colors))
      (setq count (1+ count)))
    (setq highlight-tail-colors-fade-table
          (reverse highlight-tail-colors-fade-table))))

(defun highlight-tail-find-colors-list (color-from color-to steps-count)
  "Create a list of smoothly changed colors ;
>From COLOR-FROM to COLOR-TO             ; STEPS-COUNT length."
  (let (color-from-red color-from-green color-from-blue  
                       color-to-red color-to-green color-to-blue    
                       color-red color-green color-blue       
                       color-step-red ; the color is smoothly changing; we'll 
calculate a value
                       color-step-green ; that will be added to COLOR-FROM at 
every single step,
                       color-step-blue ; multiplied by current step number of 
                       ;; will values be positive of negative
                       color-step-red-plus color-step-green-plus 
                       ;; differences between FROM and TO values
                       color-red-difference color-green-difference 
                       (step 1))
    (if (highlight-tail-color-in-hex-format color-from)
        (setq color-from-red (string-to-number (substring color-from 1 3) 16)
              color-from-green (string-to-number (substring color-from 3 5) 16)
              color-from-blue (string-to-number (substring color-from 5 7) 16 ))
      (let ((temp-color (highlight-tail-choose-color-from-list-by-name 
        (setq color-from-red (nth 1 temp-color))
        (setq color-from-green (nth 2 temp-color))
        (setq color-from-blue (nth 3 temp-color))))
    (if (highlight-tail-color-in-hex-format color-to)
        (setq color-to-red (string-to-number (substring color-to 1 3) 16)
              color-to-green (string-to-number (substring color-to 3 5) 16)
              color-to-blue (string-to-number (substring color-to 5 7) 16))
      (let ((temp-color (highlight-tail-choose-color-from-list-by-name 
        (setq color-to-red (nth 1 temp-color))
        (setq color-to-green (nth 2 temp-color))
        (setq color-to-blue (nth 3 temp-color))))

    (setq ;; compute difference of COLOR-FROM and COLOR-TO
     color-red-difference (abs (- color-from-red color-to-red))
     color-green-difference (abs (- color-from-green color-to-green))
     color-blue-difference (abs (- color-from-blue color-to-blue))
     ;; compute what every single step of fading will change
     color-step-red (/ (float color-red-difference) steps-count)
     color-step-green (/ (float color-green-difference) steps-count)
     color-step-blue (/ (float color-blue-difference) steps-count)
     ;; check if step values should be positive or negative
     color-step-red-plus (>= color-to-red color-from-red)
     color-step-green-plus (>= color-to-green color-from-green)
     color-step-blue-plus (>= color-to-blue color-from-blue)
    ;; if desirable - make values negative
    (if (not color-step-red-plus) (setq color-step-red (* color-step-red -1)))
    (if (not color-step-green-plus) (setq color-step-green (* color-step-green 
    (if (not color-step-blue-plus) (setq color-step-blue (* color-step-blue 

    ;; now compute the list ;;
    ;; we have colors in red, green and blue values;
    (while (<= step steps-count)
      (setq color-red (+ color-from-red (* color-step-red step))
            color-green (+ color-from-green (* color-step-green step))
            color-blue (+ color-from-blue (* color-step-blue step)))
      (setq result-list
            (cons (highlight-tail-build-hex-color color-red color-green 
      (setq step (1+ step)))

(defun highlight-tail-choose-color-from-list-by-name (color-name)
  "Find a COLOR-NAME in list `color-name-rgb-alist'."
  ;; throw out spaces, because there are no in `color-name-rgb-alist'
  (let ((colors-list color-name-rgb-alist)
        (color-name (downcase color-name))
        color-element) ; single element found in emacs list of colors 
                                        ; it'll be like: ("ghostwhite" 248 248 
    (while colors-list
      (if (equal (replace-regexp-in-string " " "" color-name) (car (car 
          (setq color-element (car colors-list)))
      (setq colors-list (cdr colors-list)))

(defun highlight-tail-build-hex-color (red green blue)
  "Build a color like #00FF00 from given RED, GREEN and BLUE.
For example: 0 255 0 will result in #00FF00."
  (format "#%02X%02X%02X" (round red) (round green) (round blue)))

(defun highlight-tail-color-in-hex-format (color)
  "Find out if COLOR is in hex format or not."
  (string-equal (if (featurep 'xemacs)
                    (replace-in-string color
                  (replace-regexp-in-string "#[0-9a-fA-F]\\{6\\}"

(defun highlight-tail-make-faces (colors-list)
  "Make faces from list of colors.
Faces will be named: highlight-tail-face-X, where X is
a position number in COLORS-LIST.

Set `highlight-tail-face-max' variable too."
  (let ((colors-list colors-list)
        (count 0)
    (while (< count (length colors-list))
      (setq highlight-tail-face-name
            (intern (concat "highlight-tail-face-" (number-to-string count))))
      (make-face highlight-tail-face-name)
      (set-face-background highlight-tail-face-name (nth count colors-list))
      (setq count (1+ count)))
    (setq highlight-tail-face-max (1- count))))

(defun highlight-tail-lines-to-buffer-end (point)
  "Find out how many lines to the end of the buffer from POINT."
  (1+ (- (count-lines (point-min) (point-max))
         (count-lines (point-min) point))))

(defun highlight-tail-lines-to-buffer-start (point)
  "Find out how many lines to the beginning of the buffer from POINT."
  (let (result)
    (setq result (1- (count-lines (point-min) point)))
      (goto-char point)
      (if (= (highlight-tail-line-beginning-position)
          (1+ result)

(defun highlight-tail-line-beginning-position ()
  "Return the character position of the first character on the current line."
  (if (featurep 'xemacs)

(defun highlight-tail-line-end-position (n)
  "Return the character position of the last character in the line where point 
N live."
    (goto-char n)
    (if (featurep 'xemacs)

(if (featurep 'xemacs)
      (defalias 'highlight-tail-make-overlay 'make-extent)
      (defalias 'highlight-tail-overlays-at 'extents-at)
      (defalias 'highlight-tail-overlay-put 'set-extent-property)
      (defalias 'highlight-tail-overlay-get 'extent-property)
      (defalias 'highlight-tail-delete-overlay 'delete-extent)
      (defalias 'highlight-tail-move-overlay 'set-extent-endpoints)
      (defalias 'highlight-tail-overlay-end 'extent-end-position)
      (defalias 'highlight-tail-overlay-start 'extent-start-position)
      (defalias 'highlight-tail-overlayp 'extent-live-p))
    (defalias 'highlight-tail-make-overlay 'make-overlay)
    (defalias 'highlight-tail-overlays-at 'overlays-at)
    (defalias 'highlight-tail-overlay-put 'overlay-put)
    (defalias 'highlight-tail-overlay-get 'overlay-get)
    (defalias 'highlight-tail-delete-overlay 'delete-overlay)
    (defalias 'highlight-tail-move-overlay 'move-overlay)
    (defalias 'highlight-tail-overlay-end 'overlay-end)
    (defalias 'highlight-tail-overlay-start 'overlay-start)
    (defalias 'highlight-tail-overlayp 'overlayp)))

(defun highlight-tail-tide-up (&optional first-run)
  "Delete all overlays, cancel the timer, and so on...
if FIRST-RUN do not delete the timer."
  (let ((count 0))
    (when (hash-table-p highlight-tail-overlays-list)
      (maphash 'highlight-tail-overlays-list-tide-up
      (clrhash highlight-tail-overlays-list))
    (setq count 0)
    (while (< count (length highlight-tail-const-overlays-list))
      (highlight-tail-delete-overlay (car (elt 
highlight-tail-const-overlays-list count)))
      (setq count (1+ count)))
    (setq highlight-tail-overlays-list 'nil)
    (setq highlight-tail-const-overlays-list 'nil)
    (setq highlight-tail-update-const-overlays-to-this-list 'nil)
    (unless first-run (highlight-tail-cancel-timer))))

(defun highlight-tail-cancel-timer ()
  "Cancel the timer"
  (if (featurep 'xemacs)
      (when (itimerp highlight-tail-internal-timer)
        (delete-itimer highlight-tail-internal-timer))
    (when (timerp highlight-tail-internal-timer)
      (cancel-timer highlight-tail-internal-timer))))

(defun highlight-tail-overlays-list-tide-up (key value)
  "Delete all overlays from `highlight-tail-overlays-list'."
  (if (highlight-tail-overlayp (car value))
      (highlight-tail-delete-overlay (car value))))

(defun highlight-tail-reload ()
  "Recreate color-fade-table, faces, add proper hook, turn on 
`highlight-tail-mode', and os on...
Run it, when you've made changes to some highlight-tail-mode variables."
  ;; if there is no `color-name-rgb-alist' var and some color is not in hex - 
call out an error
  (if (not (boundp 'color-name-rgb-alist))
      (let ((count 0))
        (while (< count (length highlight-tail-colors))
          (unless (highlight-tail-color-in-hex-format (car (nth count 
            (error "Some color set badly; must be in format #FFFFFF"))
          (setq count (1+ count))))
    ;; if there is a color, that doesn't exist in `color-name-rgb-alist' - call 
out an error
    (let* ((count 0)
           (color-name-rgb-alist color-name-rgb-alist) ; local copy to not 
overwrite global one
           (color-names (let (helper)
                          (while color-name-rgb-alist
                            (setq helper
                                  (cons (caar color-name-rgb-alist)
                            (setq color-name-rgb-alist
                                  (cdr color-name-rgb-alist)))
      (while (< count (length highlight-tail-colors))
        (unless (highlight-tail-color-in-hex-format (car (nth count 
          (unless (member (downcase (car (nth count highlight-tail-colors)))
            (error "Some color doesn't exist in `color-name-rgb-alist'")))
        (setq count (1+ count)))))

  (highlight-tail-mode 1)

  (highlight-tail-tide-up t)

  (setq highlight-tail-overlays-list (make-hash-table))
  (highlight-tail-make-faces highlight-tail-colors-fade-table)
  (setq highlight-tail-internal-timer (run-at-time nil highlight-tail-timer
  (add-hook 'post-command-hook 'highlight-tail-post-command))

(defun highlight-tail-mode (arg)
  "Draw a \"tail\" while you're typing.

This minor-mode draws a tail in real time, when you write.  It
changes the background color of some last typed characters and
smoothly fade them out.

If ARG is 0 or less than zero then the mode will be disabled.
If ARG is nil then the mode will be switched.
If ARG is greater than zero then this mode will be turned on."
  (interactive "P")
  (setq highlight-tail-mode
        (if (null arg) (not highlight-tail-mode)
          (> (prefix-numeric-value arg) 0)))
  (add-to-list 'minor-mode-alist '(highlight-tail-mode " ht"))
  (if (interactive-p)
      (if highlight-tail-mode
            (add-hook 'post-command-hook 'highlight-tail-post-command)
            (message "Highlight tail mode enabled"))
          (message "Highlight tail mode disabled")))))

(provide 'highlight-tail)

;;; highlight-tail.el ends here

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