mirror/emacs
1
0
Fork 0
mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-11-27 07:37:33 +00:00
Code Issues Releases Activity
730a652d2f
emacs/lisp/ruler-mode.el
Richard M. Stallman 1b3f70a03a (ruler-mode-left-scroll-bar-cols): 
Always round scroll-bar-width parameter up.
If it is nil, use 14.
2002-09-12 03:21:21 +00:00

594 lines
21 KiB
EmacsLisp
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

;;; ruler-mode.el --- display a ruler in the header line
;; Copyright (C) 2001 Free Software Foundation, Inc.
;; Author: David Ponce <david@dponce.com>
;; Maintainer: David Ponce <david@dponce.com>
;; Created: 24 Mar 2001
;; Version: 1.4
;; Keywords: convenience
;; This file is 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
;; 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, 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:
;;
;; [header-line (shift down-mouse-1)] set left margin 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 down-mouse-2] set `fill-column' to the ruler
;; graduation where the mouse pointer is on.
;;
;; [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 and `ruler-mode-tab-stop-char' shows tab
;; stop locations. `window-margins' areas are shown with a different
;; background 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
;; intermediate graduations ('!' by default).
;;
;; The following faces are customizable:
;;
;; - `ruler-mode-default-face' the ruler default face.
;; - `ruler-mode-fill-column-face' the face used to highlight the
;; `fill-column' character.
;; - `ruler-mode-current-column-face' the face used to highlight the
;; `current-column' character.
;; - `ruler-mode-tab-stop-face' 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-default-face' inherits from the built-in `default' face.
;; All `ruler-mode' faces inerit from `ruler-mode-default-face'.
;;
;; 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.
;; 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))
(defgroup ruler-mode nil
"Display a ruler in the header line."
:version "21.4"
: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)))
(if (char-valid-p value)
nil
(widget-put widget :error
(format "Invalid character value: %S" value))
widget))))
(defcustom ruler-mode-fill-column-char (if window-system
?\<5C>
?\|)
"*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-current-column-char (if window-system
?\<5C>
?\@)
"*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-margins-char ?\
"*Character used in margin areas."
: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)))
(defface ruler-mode-default-face
'((((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-column-number-face
'((t
(:inherit ruler-mode-default-face
:foreground "black"
)))
"Face used to highlight number graduations."
:group 'ruler-mode)
(defface ruler-mode-fill-column-face
'((t
(:inherit ruler-mode-default-face
:foreground "red"
)))
"Face used to highlight the fill column character."
:group 'ruler-mode)
(defface ruler-mode-tab-stop-face
'((t
(:inherit ruler-mode-default-face
:foreground "steelblue"
)))
"Face used to highlight tab stop characters."
: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"
)))
"Face used to highlight the `window-margins' areas."
:group 'ruler-mode)
(defface ruler-mode-current-column-face
'((t
(:inherit ruler-mode-default-face
:weight bold
:foreground "yellow"
)))
"Face used to highlight the `current-column' character."
:group 'ruler-mode)
(defun ruler-mode-mouse-set-left-margin (start-event)
"Set left margin 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)))))
(defun ruler-mode-mouse-set-right-margin (start-event)
"Set right margin 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."
(interactive "e")
(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)))))))
(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)
#'<)))))))))
(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)))))))))
(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-set-fill-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)
km)
"Keymap for ruler minor mode.")
(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)
(defconst ruler-mode-header-line-format
'(:eval (ruler-mode-ruler))
"`header-line-format' used in ruler mode.")
;;;###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.
(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 `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)))
;; 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 fill col, \
C-mouse-2: show tabs"
"Help string shown when mouse pointer is over the ruler.
`ruler-mode-show-tab-stops' is nil.")
(defconst ruler-mode-ruler-help-echo-tab
"\
C-mouse1/3: set/unset tab, \
C-mouse-2: hide tabs"
"Help string shown when mouse pointer 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.")
(defmacro ruler-mode-left-fringe-cols ()
"Return the width, measured in columns, of the left fringe area."
'(round (or (frame-parameter nil 'left-fringe) 0)
(frame-char-width)))
(defmacro ruler-mode-right-fringe-cols ()
"Return the width, measured in columns, of the right fringe area."
'(round (or (frame-parameter nil 'right-fringe) 0)
(frame-char-width)))
(defmacro ruler-mode-left-scroll-bar-cols ()
"Return the width, measured in columns, of the left vertical scrollbar."
'(if (eq (frame-parameter nil 'vertical-scroll-bars) 'left)
(let ((sbw (frame-parameter nil 'scroll-bar-width)))
;; nil means it's a non-toolkit scroll bar,
;; and its width in columns is 14 pixels rounded up.
(unless sbw (setq sbw 14))
;; Always round up to multiple of columns.
(ceiling sbw (frame-char-width)))
0))
(defmacro ruler-mode-right-scroll-bar-cols ()
"Return the width, measured in columns, of the right vertical scrollbar."
'(if (eq (frame-parameter nil 'vertical-scroll-bars) 'right)
(round (or (frame-parameter nil 'scroll-bar-width) 0)
(frame-char-width))
0))
(defun ruler-mode-ruler ()
"Return a string ruler."
(if ruler-mode
(let* ((j (+ (ruler-mode-left-fringe-cols)
(ruler-mode-left-scroll-bar-cols)))
(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 (+ (ruler-mode-right-fringe-cols)
(ruler-mode-right-scroll-bar-cols))
?\ )))
c k)
;; 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.
(put-text-property
i j 'face 'ruler-mode-margins-face
ruler)
(put-text-property
i j 'help-echo (format ruler-mode-left-margin-help-echo l)
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
ruler)
(put-text-property
i (length ruler) 'help-echo
(format ruler-mode-right-margin-help-echo (- w r))
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)))
(provide 'ruler-mode)
;; Local Variables:
;; coding: iso-latin-1
;; End:
;;; ruler-mode.el ends here
Reference in New Issue View Git Blame Copy Permalink