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;;; ruler-mode.el --- display a ruler in the header line
;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007,
;; 2008, 2009 Free Software Foundation, Inc.
;; Author: David Ponce <david@dponce.com>
;; Maintainer: David Ponce <david@dponce.com>
;; Created: 24 Mar 2001
;; Version: 1.6
;; Keywords: convenience
;; This file is part of GNU Emacs.
;; GNU Emacs 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 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This library provides a minor mode to display a ruler in the header
;; line. It works from Emacs 21 onwards.
;;
;; You can use the mouse to change the `fill-column' `comment-column',
;; `goal-column', `window-margins' and `tab-stop-list' settings:
;;
;; [header-line (shift down-mouse-1)] set left margin end to the ruler
;; graduation where the mouse pointer is on.
;;
;; [header-line (shift down-mouse-3)] set right margin beginning to
;; the ruler graduation where the mouse pointer is on.
;;
;; [header-line down-mouse-2] Drag the `fill-column', `comment-column'
;; or `goal-column' to a ruler graduation.
;;
;; [header-line (control down-mouse-1)] add a tab stop to the ruler
;; graduation where the mouse pointer is on.
;;
;; [header-line (control down-mouse-3)] remove the tab stop at the
;; ruler graduation where the mouse pointer is on.
;;
;; [header-line (control down-mouse-2)] or M-x
;; `ruler-mode-toggle-show-tab-stops' toggle showing and visually
;; editing `tab-stop-list' setting. The `ruler-mode-show-tab-stops'
;; option controls if the ruler shows tab stops by default.
;;
;; In the ruler the character `ruler-mode-current-column-char' shows
;; the `current-column' location, `ruler-mode-fill-column-char' shows
;; the `fill-column' location, `ruler-mode-comment-column-char' shows
;; the `comment-column' location, `ruler-mode-goal-column-char' shows
;; the `goal-column' and `ruler-mode-tab-stop-char' shows tab stop
;; locations. Graduations in `window-margins' and `window-fringes'
;; areas are shown with a different foreground color.
;;
;; It is also possible to customize the following characters:
;;
;; - `ruler-mode-basic-graduation-char' character used for basic
;; graduations ('.' by default).
;; - `ruler-mode-inter-graduation-char' character used for
;; intermediate graduations ('!' by default).
;;
;; The following faces are customizable:
;;
;; - `ruler-mode-default' the ruler default face.
;; - `ruler-mode-fill-column' the face used to highlight the
;; `fill-column' character.
;; - `ruler-mode-comment-column' the face used to highlight the
;; `comment-column' character.
;; - `ruler-mode-goal-column' the face used to highlight the
;; `goal-column' character.
;; - `ruler-mode-current-column' the face used to highlight the
;; `current-column' character.
;; - `ruler-mode-tab-stop' the face used to highlight tab stop
;; characters.
;; - `ruler-mode-margins' the face used to highlight graduations
;; in the `window-margins' areas.
;; - `ruler-mode-fringes' the face used to highlight graduations
;; in the `window-fringes' areas.
;; - `ruler-mode-column-number' the face used to highlight the
;; numbered graduations.
;;
;; `ruler-mode-default' inherits from the built-in `default' face.
;; All `ruler-mode' faces inherit from `ruler-mode-default'.
;;
;; WARNING: To keep ruler graduations aligned on text columns it is
;; important to use the same font family and size for ruler and text
;; areas.
;;
;; You can override the ruler format by defining an appropriate
;; function as the buffer-local value of `ruler-mode-ruler-function'.
;; Installation
;;
;; To automatically display the ruler in specific major modes use:
;;
;; (add-hook '<major-mode>-hook 'ruler-mode)
;;
;;; History:
;;
;;; Code:
(eval-when-compile
(require 'wid-edit))
(require 'scroll-bar)
(require 'fringe)
(defgroup ruler-mode nil
"Display a ruler in the header line."
:version "22.1"
:group 'convenience)
(defcustom ruler-mode-show-tab-stops nil
"If non-nil the ruler shows tab stop positions.
Also allowing to visually change `tab-stop-list' setting using
<C-down-mouse-1> and <C-down-mouse-3> on the ruler to respectively add
or remove a tab stop. \\[ruler-mode-toggle-show-tab-stops] or
<C-down-mouse-2> on the ruler toggles showing/editing of tab stops."
:group 'ruler-mode
:type 'boolean)
;; IMPORTANT: This function must be defined before the following
;; defcustoms because it is used in their :validate clause.
(defun ruler-mode-character-validate (widget)
"Ensure WIDGET value is a valid character value."
(save-excursion
(let ((value (widget-value widget)))
(unless (characterp value)
(widget-put widget :error
(format "Invalid character value: %S" value))
widget))))
(defcustom ruler-mode-fill-column-char (if (char-displayable-p ?¶)
?\
?\|)
"Character used at the `fill-column' location."
:group 'ruler-mode
:type '(choice
(character :tag "Character")
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
(defcustom ruler-mode-comment-column-char ?\#
"Character used at the `comment-column' location."
:group 'ruler-mode
:type '(choice
(character :tag "Character")
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
(defcustom ruler-mode-goal-column-char ?G
"Character used at the `goal-column' location."
:group 'ruler-mode
:type '(choice
(character :tag "Character")
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
(defcustom ruler-mode-current-column-char (if (char-displayable-p ?¦)
?\¦
?\@)
"Character used at the `current-column' location."
:group 'ruler-mode
:type '(choice
(character :tag "Character")
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
(defcustom ruler-mode-tab-stop-char ?\T
"Character used at `tab-stop-list' locations."
:group 'ruler-mode
:type '(choice
(character :tag "Character")
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
(defcustom ruler-mode-basic-graduation-char ?\.
"Character used for basic graduations."
:group 'ruler-mode
:type '(choice
(character :tag "Character")
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
(defcustom ruler-mode-inter-graduation-char ?\!
"Character used for intermediate graduations."
:group 'ruler-mode
:type '(choice
(character :tag "Character")
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
(defcustom ruler-mode-set-goal-column-ding-flag t
"Non-nil means do `ding' when `goal-column' is set."
:group 'ruler-mode
:type 'boolean)
(defface ruler-mode-default
'((((type tty))
(:inherit default
:background "grey64"
:foreground "grey50"
))
(t
(:inherit default
:background "grey76"
:foreground "grey64"
:box (:color "grey76"
:line-width 1
:style released-button)
)))
"Default face used by the ruler."
:group 'ruler-mode)
(defface ruler-mode-pad
'((((type tty))
(:inherit ruler-mode-default
:background "grey50"
))
(t
(:inherit ruler-mode-default
:background "grey64"
)))
"Face used to pad inactive ruler areas."
:group 'ruler-mode)
(defface ruler-mode-margins
'((t
(:inherit ruler-mode-default
:foreground "white"
)))
"Face used to highlight margin areas."
:group 'ruler-mode)
(defface ruler-mode-fringes
'((t
(:inherit ruler-mode-default
:foreground "green"
)))
"Face used to highlight fringes areas."
:group 'ruler-mode)
(defface ruler-mode-column-number
'((t
(:inherit ruler-mode-default
:foreground "black"
)))
"Face used to highlight number graduations."
:group 'ruler-mode)
(defface ruler-mode-fill-column
'((t
(:inherit ruler-mode-default
:foreground "red"
)))
"Face used to highlight the fill column character."
:group 'ruler-mode)
(defface ruler-mode-comment-column
'((t
(:inherit ruler-mode-default
:foreground "red"
)))
"Face used to highlight the comment column character."
:group 'ruler-mode)
(defface ruler-mode-goal-column
'((t
(:inherit ruler-mode-default
:foreground "red"
)))
"Face used to highlight the goal column character."
:group 'ruler-mode)
(defface ruler-mode-tab-stop
'((t
(:inherit ruler-mode-default
:foreground "steelblue"
)))
"Face used to highlight tab stop characters."
:group 'ruler-mode)
(defface ruler-mode-current-column
'((t
(:inherit ruler-mode-default
:weight bold
:foreground "yellow"
)))
"Face used to highlight the `current-column' character."
:group 'ruler-mode)
(defsubst ruler-mode-full-window-width ()
"Return the full width of the selected window."
(let ((edges (window-edges)))
(- (nth 2 edges) (nth 0 edges))))
(defsubst ruler-mode-window-col (n)
"Return a column number relative to the selected window.
N is a column number relative to selected frame."
(- n
(car (window-edges))
(or (car (window-margins)) 0)
(fringe-columns 'left)
(scroll-bar-columns 'left)))
(defun ruler-mode-mouse-set-left-margin (start-event)
"Set left margin end to the graduation where the mouse pointer is on.
START-EVENT is the mouse click event."
(interactive "e")
(let* ((start (event-start start-event))
(end (event-end start-event))
col w lm rm)
(when (eq start end) ;; mouse click
(save-selected-window
(select-window (posn-window start))
(setq col (- (car (posn-col-row start)) (car (window-edges))
(scroll-bar-columns 'left))
w (- (ruler-mode-full-window-width)
(scroll-bar-columns 'left)
(scroll-bar-columns 'right)))
(when (and (>= col 0) (< col w))
(setq lm (window-margins)
rm (or (cdr lm) 0)
lm (or (car lm) 0))
(message "Left margin set to %d (was %d)" col lm)
(set-window-margins nil col rm))))))
(defun ruler-mode-mouse-set-right-margin (start-event)
"Set right margin beginning to the graduation where the mouse pointer is on.
START-EVENT is the mouse click event."
(interactive "e")
(let* ((start (event-start start-event))
(end (event-end start-event))
col w lm rm)
(when (eq start end) ;; mouse click
(save-selected-window
(select-window (posn-window start))
(setq col (- (car (posn-col-row start)) (car (window-edges))
(scroll-bar-columns 'left))
w (- (ruler-mode-full-window-width)
(scroll-bar-columns 'left)
(scroll-bar-columns 'right)))
(when (and (>= col 0) (< col w))
(setq lm (window-margins)
rm (or (cdr lm) 0)
lm (or (car lm) 0)
col (- w col 1))
(message "Right margin set to %d (was %d)" col rm)
(set-window-margins nil lm col))))))
(defvar ruler-mode-dragged-symbol nil
"Column symbol dragged in the ruler.
That is `fill-column', `comment-column', `goal-column', or nil when
nothing is dragged.")
(defun ruler-mode-mouse-grab-any-column (start-event)
"Drag a column symbol on the ruler.
Start dragging on mouse down event START-EVENT, and update the column
symbol value with the current value of the ruler graduation while
dragging. See also the variable `ruler-mode-dragged-symbol'."
(interactive "e")
(setq ruler-mode-dragged-symbol nil)
(let* ((start (event-start start-event))
col newc oldc)
(save-selected-window
(select-window (posn-window start))
(setq col (ruler-mode-window-col (car (posn-col-row start)))
newc (+ col (window-hscroll)))
(and
(>= col 0) (< col (window-width))
(cond
;; Handle the fill column.
((eq newc fill-column)
(setq oldc fill-column
ruler-mode-dragged-symbol 'fill-column)
t) ;; Start dragging
;; Handle the comment column.
((eq newc comment-column)
(setq oldc comment-column
ruler-mode-dragged-symbol 'comment-column)
t) ;; Start dragging
;; Handle the goal column.
;; A. On mouse down on the goal column character on the ruler,
;; update the `goal-column' value while dragging.
;; B. If `goal-column' is nil, set the goal column where the
;; mouse is clicked.
;; C. On mouse click on the goal column character on the
;; ruler, unset the goal column.
((eq newc goal-column) ; A. Drag the goal column.
(setq oldc goal-column
ruler-mode-dragged-symbol 'goal-column)
t) ;; Start dragging
((null goal-column) ; B. Set the goal column.
(setq oldc goal-column
goal-column newc)
;; mouse-2 coming AFTER drag-mouse-2 invokes `ding'. This
;; `ding' flushes the next messages about setting goal
;; column. So here I force fetch the event(mouse-2) and
;; throw away.
(read-event)
;; Ding BEFORE `message' is OK.
(when ruler-mode-set-goal-column-ding-flag
(ding))
(message "Goal column set to %d (click on %s again to unset it)"
newc
(propertize (char-to-string ruler-mode-goal-column-char)
'face 'ruler-mode-goal-column))
nil) ;; Don't start dragging.
)
(if (eq 'click (ruler-mode-mouse-drag-any-column-iteration
(posn-window start)))
(when (eq 'goal-column ruler-mode-dragged-symbol)
;; C. Unset the goal column.
(set-goal-column t))
;; At end of dragging, report the updated column symbol.
(message "%s is set to %d (was %d)"
ruler-mode-dragged-symbol
(symbol-value ruler-mode-dragged-symbol)
oldc))))))
(defun ruler-mode-mouse-drag-any-column-iteration (window)
"Update the ruler while dragging the mouse.
WINDOW is the window where occurred the last down-mouse event.
Return the symbol `drag' if the mouse has been dragged, or `click' if
the mouse has been clicked."
(let ((drags 0)
event)
(track-mouse
(while (mouse-movement-p (setq event (read-event)))
(setq drags (1+ drags))
(when (eq window (posn-window (event-end event)))
(ruler-mode-mouse-drag-any-column event)
(force-mode-line-update))))
(if (and (zerop drags) (eq 'click (car (event-modifiers event))))
'click
'drag)))
(defun ruler-mode-mouse-drag-any-column (start-event)
"Update the value of the symbol dragged on the ruler.
Called on each mouse motion event START-EVENT."
(let* ((start (event-start start-event))
(end (event-end start-event))
col newc)
(save-selected-window
(select-window (posn-window start))
(setq col (ruler-mode-window-col (car (posn-col-row end)))
newc (+ col (window-hscroll)))
(when (and (>= col 0) (< col (window-width)))
(set ruler-mode-dragged-symbol newc)))))
(defun ruler-mode-mouse-add-tab-stop (start-event)
"Add a tab stop to the graduation where the mouse pointer is on.
START-EVENT is the mouse click event."
(interactive "e")
(when ruler-mode-show-tab-stops
(let* ((start (event-start start-event))
(end (event-end start-event))
col ts)
(when (eq start end) ;; mouse click
(save-selected-window
(select-window (posn-window start))
(setq col (ruler-mode-window-col (car (posn-col-row start)))
ts (+ col (window-hscroll)))
(and (>= col 0) (< col (window-width))
(not (member ts tab-stop-list))
(progn
(message "Tab stop set to %d" ts)
(setq tab-stop-list (sort (cons ts tab-stop-list)
#'<)))))))))
(defun ruler-mode-mouse-del-tab-stop (start-event)
"Delete tab stop at the graduation where the mouse pointer is on.
START-EVENT is the mouse click event."
(interactive "e")
(when ruler-mode-show-tab-stops
(let* ((start (event-start start-event))
(end (event-end start-event))
col ts)
(when (eq start end) ;; mouse click
(save-selected-window
(select-window (posn-window start))
(setq col (ruler-mode-window-col (car (posn-col-row start)))
ts (+ col (window-hscroll)))
(and (>= col 0) (< col (window-width))
(member ts tab-stop-list)
(progn
(message "Tab stop at %d deleted" ts)
(setq tab-stop-list (delete ts tab-stop-list)))))))))
(defun ruler-mode-toggle-show-tab-stops ()
"Toggle showing of tab stops on the ruler."
(interactive)
(setq ruler-mode-show-tab-stops (not ruler-mode-show-tab-stops))
(force-mode-line-update))
(defvar ruler-mode-map
(let ((km (make-sparse-keymap)))
(define-key km [header-line down-mouse-1]
#'ignore)
(define-key km [header-line down-mouse-3]
#'ignore)
(define-key km [header-line down-mouse-2]
#'ruler-mode-mouse-grab-any-column)
(define-key km [header-line (shift down-mouse-1)]
#'ruler-mode-mouse-set-left-margin)
(define-key km [header-line (shift down-mouse-3)]
#'ruler-mode-mouse-set-right-margin)
(define-key km [header-line (control down-mouse-1)]
#'ruler-mode-mouse-add-tab-stop)
(define-key km [header-line (control down-mouse-3)]
#'ruler-mode-mouse-del-tab-stop)
(define-key km [header-line (control down-mouse-2)]
#'ruler-mode-toggle-show-tab-stops)
(define-key km [header-line (shift mouse-1)]
'ignore)
(define-key km [header-line (shift mouse-3)]
'ignore)
(define-key km [header-line (control mouse-1)]
'ignore)
(define-key km [header-line (control mouse-3)]
'ignore)
(define-key km [header-line (control mouse-2)]
'ignore)
km)
"Keymap for ruler minor mode.")
(defvar ruler-mode-header-line-format-old nil
"Hold previous value of `header-line-format'.")
(defvar ruler-mode-ruler-function 'ruler-mode-ruler
"Function to call to return ruler header line format.
This variable is expected to be made buffer-local by modes.")
(defconst ruler-mode-header-line-format
'(:eval (funcall ruler-mode-ruler-function))
"`header-line-format' used in ruler mode.
Call `ruler-mode-ruler-function' to compute the ruler value.")
;;;###autoload
(define-minor-mode ruler-mode
"Display a ruler in the header line if ARG > 0."
nil nil
ruler-mode-map
:group 'ruler-mode
(if ruler-mode
(progn
;; When `ruler-mode' is on save previous header line format
;; and install the ruler header line format.
(when (and (local-variable-p 'header-line-format)
(not (local-variable-p 'ruler-mode-header-line-format-old)))
(set (make-local-variable 'ruler-mode-header-line-format-old)
header-line-format))
(setq header-line-format ruler-mode-header-line-format)
(add-hook 'post-command-hook 'force-mode-line-update nil t))
;; When `ruler-mode' is off restore previous header line format if
;; the current one is the ruler header line format.
(when (eq header-line-format ruler-mode-header-line-format)
(kill-local-variable 'header-line-format)
(when (local-variable-p 'ruler-mode-header-line-format-old)
(setq header-line-format ruler-mode-header-line-format-old)
(kill-local-variable 'ruler-mode-header-line-format-old)))
(remove-hook 'post-command-hook 'force-mode-line-update t)))
;; Add ruler-mode to the minor mode menu in the mode line
(define-key mode-line-mode-menu [ruler-mode]
`(menu-item "Ruler" ruler-mode
:button (:toggle . ruler-mode)))
(defconst ruler-mode-ruler-help-echo
"\
S-mouse-1/3: set L/R margin, \
mouse-2: set goal column, \
C-mouse-2: show tabs"
"Help string shown when mouse is over the ruler.
`ruler-mode-show-tab-stops' is nil.")
(defconst ruler-mode-ruler-help-echo-when-goal-column
"\
S-mouse-1/3: set L/R margin, \
C-mouse-2: show tabs"
"Help string shown when mouse is over the ruler.
`goal-column' is set and `ruler-mode-show-tab-stops' is nil.")
(defconst ruler-mode-ruler-help-echo-when-tab-stops
"\
C-mouse1/3: set/unset tab, \
C-mouse-2: hide tabs"
"Help string shown when mouse is over the ruler.
`ruler-mode-show-tab-stops' is non-nil.")
(defconst ruler-mode-fill-column-help-echo
"drag-mouse-2: set fill column"
"Help string shown when mouse is on the fill column character.")
(defconst ruler-mode-comment-column-help-echo
"drag-mouse-2: set comment column"
"Help string shown when mouse is on the comment column character.")
(defconst ruler-mode-goal-column-help-echo
"\
drag-mouse-2: set goal column, \
mouse-2: unset goal column"
"Help string shown when mouse is on the goal column character.")
(defconst ruler-mode-margin-help-echo
"%s margin %S"
"Help string shown when mouse is over a margin area.")
(defconst ruler-mode-fringe-help-echo
"%s fringe %S"
"Help string shown when mouse is over a fringe area.")
(defsubst ruler-mode-space (width &rest props)
"Return a single space string of WIDTH times the normal character width.
Optional argument PROPS specifies other text properties to apply."
(apply 'propertize " " 'display (list 'space :width width) props))
(defun ruler-mode-ruler ()
"Compute and return a header line ruler."
(let* ((w (window-width))
(m (window-margins))
(f (window-fringes))
(i 0)
(j (window-hscroll))
;; Setup the scrollbar, fringes, and margins areas.
(lf (ruler-mode-space
'left-fringe
'face 'ruler-mode-fringes
'help-echo (format ruler-mode-fringe-help-echo
"Left" (or (car f) 0))))
(rf (ruler-mode-space
'right-fringe
'face 'ruler-mode-fringes
'help-echo (format ruler-mode-fringe-help-echo
"Right" (or (cadr f) 0))))
(lm (ruler-mode-space
'left-margin
'face 'ruler-mode-margins
'help-echo (format ruler-mode-margin-help-echo
"Left" (or (car m) 0))))
(rm (ruler-mode-space
'right-margin
'face 'ruler-mode-margins
'help-echo (format ruler-mode-margin-help-echo
"Right" (or (cdr m) 0))))
(sb (ruler-mode-space
'scroll-bar
'face 'ruler-mode-pad))
;; Remember the scrollbar vertical type.
(sbvt (car (window-current-scroll-bars)))
;; Create an "clean" ruler.
(ruler
(propertize
(string-to-multibyte
(make-string w ruler-mode-basic-graduation-char))
'face 'ruler-mode-default
'local-map ruler-mode-map
'help-echo (cond
(ruler-mode-show-tab-stops
ruler-mode-ruler-help-echo-when-tab-stops)
(goal-column
ruler-mode-ruler-help-echo-when-goal-column)
(ruler-mode-ruler-help-echo))))
k c)
;; Setup the active area.
(while (< i w)
;; Graduations.
(cond
;; Show a number graduation.
((= (mod j 10) 0)
(setq c (number-to-string (/ j 10))
m (length c)
k i)
(put-text-property
i (1+ i) 'face 'ruler-mode-column-number
ruler)
(while (and (> m 0) (>= k 0))
(aset ruler k (aref c (setq m (1- m))))
(setq k (1- k))))
;; Show an intermediate graduation.
((= (mod j 5) 0)
(aset ruler i ruler-mode-inter-graduation-char)))
;; Special columns.
(cond
;; Show the `current-column' marker.
((= j (current-column))
(aset ruler i ruler-mode-current-column-char)
(put-text-property
i (1+ i) 'face 'ruler-mode-current-column
ruler))
;; Show the `goal-column' marker.
((and goal-column (= j goal-column))
(aset ruler i ruler-mode-goal-column-char)
(put-text-property
i (1+ i) 'face 'ruler-mode-goal-column
ruler)
(put-text-property
i (1+ i) 'mouse-face 'mode-line-highlight
ruler)
(put-text-property
i (1+ i) 'help-echo ruler-mode-goal-column-help-echo
ruler))
;; Show the `comment-column' marker.
((= j comment-column)
(aset ruler i ruler-mode-comment-column-char)
(put-text-property
i (1+ i) 'face 'ruler-mode-comment-column
ruler)
(put-text-property
i (1+ i) 'mouse-face 'mode-line-highlight
ruler)
(put-text-property
i (1+ i) 'help-echo ruler-mode-comment-column-help-echo
ruler))
;; Show the `fill-column' marker.
((= j fill-column)
(aset ruler i ruler-mode-fill-column-char)
(put-text-property
i (1+ i) 'face 'ruler-mode-fill-column
ruler)
(put-text-property
i (1+ i) 'mouse-face 'mode-line-highlight
ruler)
(put-text-property
i (1+ i) 'help-echo ruler-mode-fill-column-help-echo
ruler))
;; Show the `tab-stop-list' markers.
((and ruler-mode-show-tab-stops (member j tab-stop-list))
(aset ruler i ruler-mode-tab-stop-char)
(put-text-property
i (1+ i) 'face 'ruler-mode-tab-stop
ruler)))
(setq i (1+ i)
j (1+ j)))
;; Return the ruler propertized string. Using list here,
;; instead of concat visually separate the different areas.
(if (nth 2 (window-fringes))
;; fringes outside margins.
(list "" (and (eq 'left sbvt) sb) lf lm
ruler rm rf (and (eq 'right sbvt) sb))
;; fringes inside margins.
(list "" (and (eq 'left sbvt) sb) lm lf
ruler rf rm (and (eq 'right sbvt) sb)))))
(provide 'ruler-mode)
;; Local Variables:
;; coding: iso-latin-1
;; End:
;; arch-tag: b2f24546-5605-44c4-b67b-c9a4eeba3ee8
;;; ruler-mode.el ends here
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