rect.el 7.46 KB
Newer Older
Eric S. Raymond's avatar
Eric S. Raymond committed
1 2
;;; rect.el --- rectangle functions for GNU Emacs.

Joseph Arceneaux's avatar
Joseph Arceneaux committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105
;; Copyright (C) 1985 Free Software Foundation, Inc.

;; 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 1, 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; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.


(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
that span the starting or ending columns on any line
to multiple spaces before calling FUNCTION.
FUNCTION is called with three arguments:
 position of start of segment of this line within the rectangle,
 number of columns that belong to rectangle but are before that position,
 number of columns that belong to rectangle but are after point.
Point is at the end of the segment of this line within the rectangle."
  (let (startcol startlinepos endcol endlinepos)
    (save-excursion
     (goto-char start)
     (setq startcol (current-column))
     (beginning-of-line)
     (setq startlinepos (point)))
    (save-excursion
     (goto-char end)
     (setq endcol (current-column))
     (forward-line 1)
     (setq endlinepos (point-marker)))
    (if (< endcol startcol)
	(let ((tem startcol))
	  (setq startcol endcol endcol tem)))
    (if (/= endcol startcol)
	(save-excursion
	 (goto-char startlinepos)
	 (while (< (point) endlinepos)
	   (let (startpos begextra endextra)
	     (move-to-column startcol)
	     (and coerce-tabs
		  (> (current-column) startcol)
		  (rectangle-coerce-tab startcol))
	     (setq begextra (- (current-column) startcol))
	     (setq startpos (point))
	     (move-to-column endcol)
	     (if (> (current-column) endcol)
		 (if coerce-tabs
		     (rectangle-coerce-tab endcol)
		   (forward-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)
  (delete-region startdelpos (point)))

(defun delete-extract-rectangle-line (startdelpos begextra endextra)
  (save-excursion
   (extract-rectangle-line startdelpos begextra endextra))
  (delete-region startdelpos (point)))

(defun extract-rectangle-line (startdelpos begextra endextra)
  (let ((line (buffer-substring startdelpos (point)))
	(end (point)))
    (goto-char startdelpos)
    (while (search-forward "\t" end t)
      (let ((width (- (current-column)
		      (save-excursion (forward-char -1)
				      (current-column)))))
	(setq line (concat (substring line 0 (- (point) end 1))
			   (spaces-string width)
			   (substring line (+ (length line) (- (point) end)))))))
    (if (or (> begextra 0) (> endextra 0))
	(setq line (concat (spaces-string begextra)
			   line
			   (spaces-string endextra))))
    (setq lines (cons line lines))))

(defconst spaces-strings
  '["" " " "  " "   " "    " "     " "      " "       " "        "])

(defun spaces-string (n)
  (if (<= n 8) (aref spaces-strings n)
    (let ((val ""))
      (while (> n 8)
	(setq val (concat "        " val)
	      n (- n 8)))
      (concat val (aref spaces-strings n)))))
    
Jim Blandy's avatar
Jim Blandy committed
106
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
107 108
(defun delete-rectangle (start end)
  "Delete (don't save) text in rectangle with point and mark as corners.
109 110
The same range of columns is deleted in each line starting with the line
where the region begins and ending with the line where the region ends."
Joseph Arceneaux's avatar
Joseph Arceneaux committed
111 112 113
  (interactive "r")
  (operate-on-rectangle 'delete-rectangle-line start end t))

Jim Blandy's avatar
Jim Blandy committed
114
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
115 116 117 118 119 120 121 122 123
(defun delete-extract-rectangle (start end)
  "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)
    (operate-on-rectangle 'delete-extract-rectangle-line
			  start end t)
    (nreverse lines)))

Jim Blandy's avatar
Jim Blandy committed
124
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
125 126 127 128 129 130 131 132 133 134
(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)
    (operate-on-rectangle 'extract-rectangle-line start end nil)
    (nreverse lines)))

(defvar killed-rectangle nil
  "Rectangle for yank-rectangle to insert.")

Jim Blandy's avatar
Jim Blandy committed
135
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
136 137 138
(defun kill-rectangle (start end)
  "Delete rectangle with corners at point and mark; save as last killed one.
Calling from program, supply two args START and END, buffer positions.
139
But in programs you might prefer to use `delete-extract-rectangle'."
Joseph Arceneaux's avatar
Joseph Arceneaux committed
140 141 142
  (interactive "r")
  (setq killed-rectangle (delete-extract-rectangle start end)))

Jim Blandy's avatar
Jim Blandy committed
143
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
144 145 146 147 148
(defun yank-rectangle ()
  "Yank the last killed rectangle with upper left corner at point."
  (interactive)
  (insert-rectangle killed-rectangle))

Jim Blandy's avatar
Jim Blandy committed
149
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
150 151
(defun insert-rectangle (rectangle)
  "Insert text of RECTANGLE with upper left corner at point.
152 153
RECTANGLE's first line is inserted at point, its second
line is inserted at a point vertically under point, etc.
Joseph Arceneaux's avatar
Joseph Arceneaux committed
154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171
RECTANGLE should be a list of strings."
  (let ((lines rectangle)
	(insertcolumn (current-column))
	(first t))
    (while lines
      (or first
	  (progn
	   (forward-line 1)
	   (or (bolp) (insert ?\n))
	   (move-to-column insertcolumn)
	   (if (> (current-column) insertcolumn)
	       (rectangle-coerce-tab insertcolumn))
	   (if (< (current-column) insertcolumn)
	       (indent-to insertcolumn))))
      (setq first nil)
      (insert (car lines))
      (setq lines (cdr lines)))))

Jim Blandy's avatar
Jim Blandy committed
172
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
(defun open-rectangle (start end)
  "Blank out rectangle with corners at point and mark, shifting text right.
The text previously in the region is not overwritten by the blanks,
but insted winds up to the right of the rectangle."
  (interactive "r")
  (operate-on-rectangle 'open-rectangle-line start end nil))

(defun open-rectangle-line (startpos begextra endextra)
  (let ((column (+ (current-column) begextra endextra)))
    (goto-char startpos)
    (let ((ocol (current-column)))
      (skip-chars-forward " \t")
      (setq column (+ column (- (current-column) ocol))))
    (delete-region (point)
                   (progn (skip-chars-backward " \t")
			  (point)))
    (indent-to column)))

Jim Blandy's avatar
Jim Blandy committed
191
;;;###autoload
Joseph Arceneaux's avatar
Joseph Arceneaux committed
192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
(defun clear-rectangle (start end)
  "Blank out rectangle with corners at point and mark.
The text previously in the region is overwritten by the blanks.
When called from a program, requires two args which specify the corners."
  (interactive "r")
  (operate-on-rectangle 'clear-rectangle-line start end t))

(defun clear-rectangle-line (startpos begextra endextra)
  (skip-chars-forward " \t")
  (let ((column (+ (current-column) endextra)))
    (delete-region (point)
                   (progn (goto-char startpos)
			  (skip-chars-backward " \t")
			  (point)))
    (indent-to column)))

(defun rectangle-coerce-tab (column)
  (let ((aftercol (current-column))
	(indent-tabs-mode nil))
    (delete-char -1)
    (indent-to aftercol)
    (backward-char (- aftercol column))))
Eric S. Raymond's avatar
Eric S. Raymond committed
214 215

;;; rect.el ends here