-;;; ruler-mode.el --- Display a ruler in the header line
+;;; ruler-mode.el --- display a ruler in the header line
-;; Copyright (C) 2001 Free Software Foundation, Inc.
+;; Copyright (C) 2001, 2002, 2003, 2004, 2005,
+;; 2006 Free Software Foundation, Inc.
;; Author: David Ponce <david@dponce.com>
;; Maintainer: David Ponce <david@dponce.com>
;; Created: 24 Mar 2001
-;; Version: 1.4
-;; Keywords: environment
+;; Version: 1.6
+;; Keywords: convenience
;; This file is part of GNU Emacs.
;; 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., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This library provides a minor mode to display a ruler in the header
;; line. It works only on Emacs 21.
;;
-;; You can use the mouse to change the `fill-column', `window-margins'
-;; and `tab-stop-list' settings:
+;; 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 to the ruler
+;; [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 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] set `fill-column' 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.
;;
;; 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 and `ruler-mode-tab-stop-char' shows tab
-;; stop locations. `window-margins' areas are shown with a different
-;; background color.
+;; 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-margins-char' character used to pad margin areas
-;; (space by default).
;; - `ruler-mode-basic-graduation-char' character used for basic
;; graduations ('.' by default).
;; - `ruler-mode-inter-graduation-char' character used for
;;
;; The following faces are customizable:
;;
-;; - `ruler-mode-default-face' the ruler default face.
-;; - `ruler-mode-fill-column-face' the face used to highlight the
+;; - `ruler-mode-default' the ruler default face.
+;; - `ruler-mode-fill-column' the face used to highlight the
;; `fill-column' character.
-;; - `ruler-mode-current-column-face' the face used to highlight the
+;; - `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-face' the face used to highlight tab stop
+;; - `ruler-mode-tab-stop' the face used to highlight tab stop
;; characters.
-;; - `ruler-mode-margins-face' the face used to highlight the
-;; `window-margins' areas.
-;; - `ruler-mode-column-number-face' the face used to highlight the
-;; number graduations.
+;; - `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-face' inherits from the built-in `default' face.
-;; All `ruler-mode' faces inerit from `ruler-mode-default-face'.
+;; `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
;;
;;; Code:
(eval-when-compile
(require 'wid-edit))
+(require 'scroll-bar)
+(require 'fringe)
(defgroup ruler-mode nil
"Display a ruler in the header line."
- :version "21.2"
- :group 'environment)
+ :version "22.1"
+ :group 'convenience)
(defcustom ruler-mode-show-tab-stops nil
"*If non-nil the ruler shows tab stop positions.
(widget-put widget :error
(format "Invalid character value: %S" value))
widget))))
-
-(defcustom ruler-mode-fill-column-char (if window-system
+
+(defcustom ruler-mode-fill-column-char (if (char-displayable-p ?¶)
?\¶
?\|)
"*Character used at the `fill-column' location."
(integer :tag "Integer char value"
:validate ruler-mode-character-validate)))
-(defcustom ruler-mode-current-column-char (if window-system
- ?\¦
- ?\@)
- "*Character used at the `current-column' location."
+(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-tab-stop-char ?\T
- "*Character used at `tab-stop-list' locations."
+(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-margins-char ?\
- "*Character used in margin areas."
+(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")
(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)
\f
-(defface ruler-mode-default-face
+(defface ruler-mode-default
'((((type tty))
(:inherit default
:background "grey64"
"Default face used by the ruler."
:group 'ruler-mode)
-(defface ruler-mode-column-number-face
+(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-face
+ (:inherit ruler-mode-default
:foreground "black"
)))
"Face used to highlight number graduations."
:group 'ruler-mode)
-(defface ruler-mode-fill-column-face
+(defface ruler-mode-fill-column
'((t
- (:inherit ruler-mode-default-face
+ (:inherit ruler-mode-default
:foreground "red"
)))
"Face used to highlight the fill column character."
:group 'ruler-mode)
-(defface ruler-mode-tab-stop-face
+(defface ruler-mode-comment-column
'((t
- (:inherit ruler-mode-default-face
- :foreground "steelblue"
+ (:inherit ruler-mode-default
+ :foreground "red"
)))
- "Face used to highlight tab stop characters."
+ "Face used to highlight the comment column character."
:group 'ruler-mode)
-(defface ruler-mode-margins-face
- '((((type tty))
- (:inherit ruler-mode-default-face
- :background "grey50"
- ))
- (t
- (:inherit ruler-mode-default-face
- :background "grey64"
+(defface ruler-mode-goal-column
+ '((t
+ (:inherit ruler-mode-default
+ :foreground "red"
)))
- "Face used to highlight the `window-margins' areas."
+ "Face used to highlight the goal column character."
:group 'ruler-mode)
-(defface ruler-mode-current-column-face
+(defface ruler-mode-tab-stop
'((t
- (:inherit ruler-mode-default-face
+ (: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)
\f
+
+(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)))
+\f
(defun ruler-mode-mouse-set-left-margin (start-event)
- "Set left margin to the graduation where the mouse pointer is on.
+ "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))
- w col m lm0 lm rm)
- (if (eq start end) ;; mouse click
- (save-selected-window
- (select-window (posn-window start))
- (setq m (window-margins)
- lm0 (or (car m) 0)
- rm (or (cdr m) 0)
- w (window-width)
- col (car (posn-col-row start))
- lm (min (- w rm) col))
- (message "Left margin set to %d (was %d)" lm lm0)
- (set-window-margins nil lm rm)))))
+ 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 to the graduation where the mouse pointer is on.
+ "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))
- m col w lm rm0 rm)
- (if (eq start end) ;; mouse click
- (save-selected-window
- (select-window (posn-window start))
- (setq m (window-margins)
- rm0 (or (cdr m) 0)
- lm (or (car m) 0)
- col (car (posn-col-row start))
- w (window-width)
- rm (max 0 (- w col)))
- (message "Right margin set to %d (was %d)" rm rm0)
- (set-window-margins nil lm rm)))))
-
-(defun ruler-mode-mouse-set-fill-column (start-event)
- "Set `fill-column' to the graduation where the mouse pointer is on.
-START-EVENT is the mouse click 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))
- m col w lm rm hs fc)
- (if (eq start end) ;; mouse click
- (save-selected-window
- (select-window (posn-window start))
- (setq m (window-margins)
- lm (or (car m) 0)
- rm (or (cdr m) 0)
- col (- (car (posn-col-row start)) lm)
- w (window-width)
- hs (window-hscroll)
- fc (+ col hs))
- (and (>= col 0) (< (+ col lm rm) w)
- (progn
- (message "Fill column set to %d (was %d)" fc fill-column)
- (setq fill-column fc)))))))
+ 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)))))
\f
(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")
- (if ruler-mode-show-tab-stops
- (let* ((start (event-start start-event))
- (end (event-end start-event))
- m col w lm rm hs ts)
- (if (eq start end) ;; mouse click
- (save-selected-window
- (select-window (posn-window start))
- (setq m (window-margins)
- lm (or (car m) 0)
- rm (or (cdr m) 0)
- col (- (car (posn-col-row start)) lm)
- w (window-width)
- hs (window-hscroll)
- ts (+ col hs))
- (and (>= col 0) (< (+ col lm rm) w)
- (not (member ts tab-stop-list))
- (progn
- (message "Tab stop set to %d" ts)
- (setq tab-stop-list
- (sort (cons ts tab-stop-list)
- #'<)))))))))
+ (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")
- (if ruler-mode-show-tab-stops
- (let* ((start (event-start start-event))
- (end (event-end start-event))
- m col w lm rm hs ts)
- (if (eq start end) ;; mouse click
- (save-selected-window
- (select-window (posn-window start))
- (setq m (window-margins)
- lm (or (car m) 0)
- rm (or (cdr m) 0)
- col (- (car (posn-col-row start)) lm)
- w (window-width)
- hs (window-hscroll)
- ts (+ col hs))
- (and (>= col 0) (< (+ col lm rm) w)
- (member ts tab-stop-list)
- (progn
- (message "Tab stop at %d deleted" ts)
- (setq tab-stop-list
- (delete ts tab-stop-list)))))))))
+ (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."
(define-key km [header-line down-mouse-3]
#'ignore)
(define-key km [header-line down-mouse-2]
- #'ruler-mode-mouse-set-fill-column)
+ #'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)]
(defvar ruler-mode-header-line-format-old nil
"Hold previous value of `header-line-format'.")
-(make-variable-buffer-local 'ruler-mode-header-line-format-old)
+
+(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 (ruler-mode-ruler))
- "`header-line-format' used in ruler mode.")
+ '(: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
(progn
;; When `ruler-mode' is on save previous header line format
;; and install the ruler header line format.
- (setq ruler-mode-header-line-format-old header-line-format
- header-line-format ruler-mode-header-line-format)
- (add-hook 'post-command-hook ; add local hook
- #'force-mode-line-update nil t))
+ (when (local-variable-p 'header-line-format)
+ (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.
- (if (eq header-line-format ruler-mode-header-line-format)
- (setq header-line-format ruler-mode-header-line-format-old))
- (remove-hook 'post-command-hook ; remove local hook
- #'force-mode-line-update t)))
+ (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)))
\f
-;; Add ruler-mode to the the minor mode menu in the mode line
+;; 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)))
+ :button (:toggle . ruler-mode)))
(defconst ruler-mode-ruler-help-echo
"\
S-mouse-1/3: set L/R margin, \
-mouse-2: set fill col, \
+mouse-2: set goal column, \
C-mouse-2: show tabs"
- "Help string shown when mouse pointer is over the ruler.
+ "Help string shown when mouse is over the ruler.
`ruler-mode-show-tab-stops' is nil.")
-(defconst ruler-mode-ruler-help-echo-tab
+(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 pointer is over the ruler.
+ "Help string shown when mouse is over the ruler.
`ruler-mode-show-tab-stops' is non-nil.")
-(defconst ruler-mode-left-margin-help-echo
- "Left margin %S"
- "Help string shown when mouse is over the left margin area.")
-
-(defconst ruler-mode-right-margin-help-echo
- "Right margin %S"
- "Help string shown when mouse is over the right margin area.")
-
-(defun ruler-mode-extra-left-cols ()
- "Return number of extra columns on the left side of selected frame.
-That is the number of columns occupied by the left fringe area and
-vertical scrollbar on the left side of the selected frame."
- (let ((w (frame-first-window))
- (xy (cons 0 0)))
- (with-current-buffer (window-buffer w)
- (let (header-line-format)
- (while (not (listp (coordinates-in-window-p xy w)))
- (setcar xy (1+ (car xy))))
- (car xy)))))
+(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))
\f
(defun ruler-mode-ruler ()
- "Return a string ruler."
- (if ruler-mode
- (let* ((j (ruler-mode-extra-left-cols))
- (k (/ (or (frame-parameter nil 'right-fringe) 0)
- (frame-char-width)))
- (w (+ (window-width) j))
- (m (window-margins))
- (l (or (car m) 0))
- (r (or (cdr m) 0))
- (o (- (window-hscroll) l j))
- (i 0)
- (ruler (concat
- ;; unit graduations
- (make-string w ruler-mode-basic-graduation-char)
- ;; extra space to fill the header line
- (make-string k ?\ )))
- c)
-
- ;; Setup default face and help echo.
- (put-text-property 0 (length ruler)
- 'face 'ruler-mode-default-face
- ruler)
- (put-text-property 0 (length ruler)
- 'help-echo
- (if ruler-mode-show-tab-stops
- ruler-mode-ruler-help-echo-tab
- ruler-mode-ruler-help-echo)
- ruler)
- ;; Setup the local map.
- (put-text-property 0 (length ruler)
- 'local-map ruler-mode-map
- ruler)
-
- (setq j (+ l j))
- ;; Setup the left margin area.
+ "Compute and return an 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
+ (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 j 'face 'ruler-mode-margins-face
+ 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 j 'help-echo (format ruler-mode-left-margin-help-echo l)
+ 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)
- (while (< i j)
- (aset ruler i ruler-mode-margins-char)
- (setq i (1+ i)))
-
- ;; Setup the ruler area.
- (setq r (- w r))
- (while (< i r)
- (setq j (+ i o))
- (cond
- ((= (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-face
- ruler)
- (while (and (> m 0) (>= k 0))
- (aset ruler k (aref c (setq m (1- m))))
- (setq k (1- k)))
- )
- ((= (mod j 5) 0)
- (aset ruler i ruler-mode-inter-graduation-char)
- )
- )
- (setq i (1+ i)))
-
- ;; Setup the right margin area.
(put-text-property
- i (length ruler) 'face 'ruler-mode-margins-face
+ 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 (length ruler) 'help-echo
- (format ruler-mode-right-margin-help-echo (- w r))
+ i (1+ i) 'face 'ruler-mode-fill-column
+ ruler)
+ (put-text-property
+ i (1+ i) 'mouse-face 'mode-line-highlight
ruler)
- (while (< i (length ruler))
- (aset ruler i ruler-mode-margins-char)
- (setq i (1+ i)))
-
- ;; Show the `fill-column' marker.
- (setq i (- fill-column o))
- (and (>= i 0) (< i r)
- (aset ruler i ruler-mode-fill-column-char)
- (put-text-property
- i (1+ i) 'face 'ruler-mode-fill-column-face
- ruler))
-
- ;; Show the `tab-stop-list' markers.
- (if ruler-mode-show-tab-stops
- (let ((tsl tab-stop-list) ts)
- (while tsl
- (setq ts (car tsl)
- tsl (cdr tsl)
- i (- ts o))
- (and (>= i 0) (< i r)
- (aset ruler i ruler-mode-tab-stop-char)
- (put-text-property
- i (1+ i)
- 'face (cond
- ;; Don't override the fill-column face
- ((eq ts fill-column)
- 'ruler-mode-fill-column-face)
- (t
- 'ruler-mode-tab-stop-face))
- ruler)))))
-
- ;; Show the `current-column' marker.
- (setq i (- (current-column) o))
- (and (>= i 0) (< i r)
- (aset ruler i ruler-mode-current-column-char)
- (put-text-property
- i (1+ i) 'face 'ruler-mode-current-column-face
- ruler))
-
- 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)
;; coding: iso-latin-1
;; End:
+;;; arch-tag: b2f24546-5605-44c4-b67b-c9a4eeba3ee8
;;; ruler-mode.el ends here