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- ;; Rectangle functions for GNU Emacs.
- ;; 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)))))
-
- (defun delete-rectangle (start end)
- "Delete (don't save) text in rectangle with point and mark as corners.
- 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."
- (interactive "r")
- (operate-on-rectangle 'delete-rectangle-line start end t))
-
- (defun delete-extract-rectangle (start end)
- "Return and delete 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 'delete-extract-rectangle-line
- start end t)
- (nreverse lines)))
-
- (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.")
-
- (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.
- But in programs you might prefer to use delete-extract-rectangle."
- (interactive "r")
- (setq killed-rectangle (delete-extract-rectangle start end)))
-
- (defun yank-rectangle ()
- "Yank the last killed rectangle with upper left corner at point."
- (interactive)
- (insert-rectangle killed-rectangle))
-
- (defun insert-rectangle (rectangle)
- "Insert text of RECTANGLE with upper left corner at point.
- RECTANGLE's first line is inserted at point,
- its second line is inserted at a point vertically under point, etc.
- 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)))))
-
- (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)))
-
- (defun clear-rectangle (start end &optional preserve-position)
- "Blank out rectangle with corners at point and mark.
- The text previously in the region is overwritten by the blanks."
- (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)
- (or preserve-position
- (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))))
-