;;; rect.el --- rectangle functions for GNU Emacs.
-;; Copyright (C) 1985 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal
;; GNU 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; 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:
+
+;; This package provides the operations on rectangles that are ocumented
+;; in the Emacs manual.
;;; Code:
+;;;###autoload
+(defun move-to-column-force (column)
+ "Move point to column COLUMN rigidly in the current line.
+If COLUMN is within a multi-column character, replace it by
+spaces and tab."
+ (let ((col (move-to-column column t)))
+ (if (> col column)
+ (let (pos)
+ (delete-char -1)
+ (insert-char ? (- column (current-column)))
+ (setq pos (point))
+ (indent-to col)
+ (goto-char pos)))
+ column))
+
+;; extract-rectangle-line stores lines into this list
+;; to accumulate them for extract-rectangle and delete-extract-rectangle.
+(defvar operate-on-rectangle-lines)
+
(defun operate-on-rectangle (function start end coerce-tabs)
"Call FUNCTION for each line of rectangle with corners at START, END.
If COERCE-TABS is non-nil, convert multi-column characters
(setq endlinepos (point-marker)))
(if (< endcol startcol)
(setq startcol (prog1 endcol (setq endcol startcol))))
- (if (/= endcol startcol)
- (save-excursion
- (goto-char startlinepos)
- (while (< (point) endlinepos)
- (let (startpos begextra endextra)
- (move-to-column startcol coerce-tabs)
- (setq begextra (- (current-column) startcol))
- (setq startpos (point))
- (move-to-column endcol coerce-tabs)
- (setq endextra (- endcol (current-column)))
- (if (< begextra 0)
- (setq endextra (+ endextra begextra)
- begextra 0))
- (funcall function startpos begextra endextra))
- (forward-line 1))))
+ (save-excursion
+ (goto-char startlinepos)
+ (while (< (point) endlinepos)
+ (let (startpos begextra endextra)
+ (if coerce-tabs
+ (move-to-column-force startcol)
+ (move-to-column startcol))
+ (setq begextra (- (current-column) startcol))
+ (setq startpos (point))
+ (if coerce-tabs
+ (move-to-column-force endcol)
+ (move-to-column endcol))
+ ;; If we overshot, move back one character
+ ;; so that endextra will be positive.
+ (if (and (not coerce-tabs) (> (current-column) endcol))
+ (backward-char 1))
+ (setq endextra (- endcol (current-column)))
+ (if (< begextra 0)
+ (setq endextra (+ endextra begextra)
+ begextra 0))
+ (funcall function startpos begextra endextra))
+ (forward-line 1)))
(- endcol startcol)))
(defun delete-rectangle-line (startdelpos ignore ignore)
(setq line (concat (spaces-string begextra)
line
(spaces-string endextra))))
- (setq lines (cons line lines))))
+ (setq operate-on-rectangle-lines (cons line operate-on-rectangle-lines))))
(defconst spaces-strings
'["" " " " " " " " " " " " " " " " "])
"Delete contents of rectangle and return it as a list of strings.
Arguments START and END are the corners of the rectangle.
The value is list of strings, one for each line of the rectangle."
- (let (lines)
+ (let (operate-on-rectangle-lines)
(operate-on-rectangle 'delete-extract-rectangle-line
start end t)
- (nreverse lines)))
+ (nreverse operate-on-rectangle-lines)))
;;;###autoload
(defun extract-rectangle (start end)
"Return contents of rectangle with corners at START and END.
Value is list of strings, one for each line of the rectangle."
- (let (lines)
+ (let (operate-on-rectangle-lines)
(operate-on-rectangle 'extract-rectangle-line start end nil)
- (nreverse lines)))
+ (nreverse operate-on-rectangle-lines)))
(defvar killed-rectangle nil
"Rectangle for yank-rectangle to insert.")
Calling from program, supply two args START and END, buffer positions.
But in programs you might prefer to use `delete-extract-rectangle'."
(interactive "r")
+ (if buffer-read-only
+ (progn
+ (setq killed-rectangle (extract-rectangle start end))
+ (barf-if-buffer-read-only)))
(setq killed-rectangle (delete-extract-rectangle start end)))
;;;###autoload
(progn
(forward-line 1)
(or (bolp) (insert ?\n))
- (move-to-column insertcolumn t)))
+ (move-to-column-force insertcolumn)))
(setq first nil)
(insert (car lines))
(setq lines (cdr lines)))))
(goto-char start))
(defun open-rectangle-line (startpos begextra endextra)
- (let ((column (+ (current-column) begextra endextra)))
+ ;; Column where rectangle ends.
+ (let ((endcol (+ (current-column) endextra))
+ whitewidth)
(goto-char startpos)
+ ;; Column where rectangle begins.
+ (let ((begcol (- (current-column) begextra)))
+ (if (> begextra 0)
+ (move-to-column-force begcol))
+ (skip-chars-forward " \t")
+ ;; Width of whitespace to be deleted and recreated.
+ (setq whitewidth (- (current-column) begcol)))
+ ;; Delete the whitespace following the start column.
+ (delete-region startpos (point))
+ ;; Open the desired width, plus same amount of whitespace we just deleted.
+ (indent-to (+ endcol whitewidth))))
+
+;;;###autoload (defalias 'close-rectangle 'delete-whitespace-rectangle) ;; Old name
+;;;###autoload
+(defun delete-whitespace-rectangle (start end)
+ "Delete all whitespace following a specified column in each line.
+The left edge of the rectangle specifies the position in each line
+at which whitespace deletion should begin. On each line in the
+rectangle, all continuous whitespace starting at that column is deleted."
+ (interactive "r")
+ (operate-on-rectangle '(lambda (startpos begextra endextra)
+ (save-excursion
+ (goto-char startpos)
+ (delete-region (point)
+ (progn
+ (skip-syntax-forward " ")
+ (point)))))
+ start end t))
+
+;; string-rectangle uses this variable to pass the string
+;; to string-rectangle-line.
+(defvar string-rectangle-string)
+
+;;;###autoload
+(defun string-rectangle (start end string)
+ "Replace rectangle contents with STRING on each line.
+The length of STRING need not be the same as the rectangle width.
+
+Called from a program, takes three args; START, END and STRING."
+ (interactive "r\nsString rectangle: ")
+ (let ((string-rectangle-string string))
+ (operate-on-rectangle 'string-rectangle-line start end t)))
+
+(defun string-rectangle-line (startpos begextra endextra)
+ (let (whitespace)
+ ;; Delete the width of the rectangle.
+ (delete-region startpos (point))
+ ;; Compute horizontal width of following whitespace.
(let ((ocol (current-column)))
(skip-chars-forward " \t")
- (setq column (+ column (- (current-column) ocol))))
- (delete-region (point)
- ;; Use skip-chars-backward's LIM argument to leave
- ;; characters before STARTPOS undisturbed.
- (progn (skip-chars-backward " \t" startpos)
- (point)))
- (indent-to column)))
+ (setq whitespace (- (current-column) ocol)))
+ ;; Delete the following whitespace.
+ (delete-region startpos (point))
+ ;; Insert the desired string.
+ (insert string-rectangle-string)
+ ;; Insert the same width of whitespace that we had before.
+ (indent-to (+ (current-column) whitespace))))
;;;###autoload
(defun clear-rectangle (start end)
(operate-on-rectangle 'clear-rectangle-line start end t))
(defun clear-rectangle-line (startpos begextra endextra)
+ ;; Find end of whitespace after the rectangle.
(skip-chars-forward " \t")
(let ((column (+ (current-column) endextra)))
+ ;; Delete the text in the rectangle, and following whitespace.
(delete-region (point)
(progn (goto-char startpos)
(skip-chars-backward " \t")
(point)))
+ ;; Reindent out to same column that we were at.
(indent-to column)))
(provide 'rect)
HCoop / bpt / emacs.git / blobdiff