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251 lines
8.8 KiB
EmacsLisp
251 lines
8.8 KiB
EmacsLisp
;;; rect.el --- rectangle functions for GNU Emacs.
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;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: internal
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package provides the operations on rectangles that are ocumented
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;; in the Emacs manual.
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;;; Code:
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(defun operate-on-rectangle (function start end coerce-tabs)
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"Call FUNCTION for each line of rectangle with corners at START, END.
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If COERCE-TABS is non-nil, convert multi-column characters
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that span the starting or ending columns on any line
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to multiple spaces before calling FUNCTION.
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FUNCTION is called with three arguments:
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position of start of segment of this line within the rectangle,
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number of columns that belong to rectangle but are before that position,
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number of columns that belong to rectangle but are after point.
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Point is at the end of the segment of this line within the rectangle."
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(let (startcol startlinepos endcol endlinepos)
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(save-excursion
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(goto-char start)
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(setq startcol (current-column))
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(beginning-of-line)
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(setq startlinepos (point)))
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(save-excursion
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(goto-char end)
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(setq endcol (current-column))
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(forward-line 1)
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(setq endlinepos (point-marker)))
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(if (< endcol startcol)
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(setq startcol (prog1 endcol (setq endcol startcol))))
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(save-excursion
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(goto-char startlinepos)
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(while (< (point) endlinepos)
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(let (startpos begextra endextra)
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(move-to-column startcol coerce-tabs)
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(setq begextra (- (current-column) startcol))
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(setq startpos (point))
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(move-to-column endcol coerce-tabs)
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;; If we overshot, move back one character
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;; so that endextra will be positive.
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(if (and (not coerce-tabs) (> (current-column) endcol))
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(backward-char 1))
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(setq endextra (- endcol (current-column)))
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(if (< begextra 0)
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(setq endextra (+ endextra begextra)
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begextra 0))
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(funcall function startpos begextra endextra))
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(forward-line 1)))
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(- endcol startcol)))
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(defun delete-rectangle-line (startdelpos ignore ignore)
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(delete-region startdelpos (point)))
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(defun delete-extract-rectangle-line (startdelpos begextra endextra)
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(save-excursion
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(extract-rectangle-line startdelpos begextra endextra))
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(delete-region startdelpos (point)))
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(defun extract-rectangle-line (startdelpos begextra endextra)
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(let ((line (buffer-substring startdelpos (point)))
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(end (point)))
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(goto-char startdelpos)
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(while (search-forward "\t" end t)
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(let ((width (- (current-column)
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(save-excursion (forward-char -1)
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(current-column)))))
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(setq line (concat (substring line 0 (- (point) end 1))
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(spaces-string width)
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(substring line (+ (length line) (- (point) end)))))))
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(if (or (> begextra 0) (> endextra 0))
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(setq line (concat (spaces-string begextra)
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line
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(spaces-string endextra))))
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(setq lines (cons line lines))))
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(defconst spaces-strings
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'["" " " " " " " " " " " " " " " " "])
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(defun spaces-string (n)
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(if (<= n 8) (aref spaces-strings n)
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(let ((val ""))
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(while (> n 8)
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(setq val (concat " " val)
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n (- n 8)))
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(concat val (aref spaces-strings n)))))
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;;;###autoload
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(defun delete-rectangle (start end)
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"Delete (don't save) text in rectangle with point and mark as corners.
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The same range of columns is deleted in each line starting with the line
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where the region begins and ending with the line where the region ends."
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(interactive "r")
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(operate-on-rectangle 'delete-rectangle-line start end t))
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;;;###autoload
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(defun delete-extract-rectangle (start end)
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"Delete contents of rectangle and return it as a list of strings.
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Arguments START and END are the corners of the rectangle.
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The value is list of strings, one for each line of the rectangle."
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(let (lines)
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(operate-on-rectangle 'delete-extract-rectangle-line
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start end t)
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(nreverse lines)))
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;;;###autoload
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(defun extract-rectangle (start end)
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"Return contents of rectangle with corners at START and END.
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Value is list of strings, one for each line of the rectangle."
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(let (lines)
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(operate-on-rectangle 'extract-rectangle-line start end nil)
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(nreverse lines)))
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(defvar killed-rectangle nil
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"Rectangle for yank-rectangle to insert.")
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;;;###autoload
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(defun kill-rectangle (start end)
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"Delete rectangle with corners at point and mark; save as last killed one.
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Calling from program, supply two args START and END, buffer positions.
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But in programs you might prefer to use `delete-extract-rectangle'."
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(interactive "r")
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(if buffer-read-only
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(progn
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(setq killed-rectangle (extract-rectangle start end))
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(barf-if-buffer-read-only)))
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(setq killed-rectangle (delete-extract-rectangle start end)))
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;;;###autoload
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(defun yank-rectangle ()
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"Yank the last killed rectangle with upper left corner at point."
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(interactive)
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(insert-rectangle killed-rectangle))
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;;;###autoload
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(defun insert-rectangle (rectangle)
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"Insert text of RECTANGLE with upper left corner at point.
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RECTANGLE's first line is inserted at point, its second
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line is inserted at a point vertically under point, etc.
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RECTANGLE should be a list of strings.
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After this command, the mark is at the upper left corner
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and point is at the lower right corner."
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(let ((lines rectangle)
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(insertcolumn (current-column))
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(first t))
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(push-mark)
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(while lines
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(or first
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(progn
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(forward-line 1)
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(or (bolp) (insert ?\n))
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(move-to-column insertcolumn t)))
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(setq first nil)
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(insert (car lines))
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(setq lines (cdr lines)))))
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;;;###autoload
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(defun open-rectangle (start end)
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"Blank out rectangle with corners at point and mark, shifting text right.
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The text previously in the region is not overwritten by the blanks,
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but instead winds up to the right of the rectangle."
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(interactive "r")
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(operate-on-rectangle 'open-rectangle-line start end nil)
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(goto-char start))
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(defun open-rectangle-line (startpos begextra endextra)
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;; Column where rectangle ends.
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(let ((endcol (+ (current-column) endextra))
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whitewidth)
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(goto-char startpos)
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;; Column where rectangle begins.
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(let ((begcol (- (current-column) begextra)))
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(skip-chars-forward " \t")
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;; Width of whitespace to be deleted and recreated.
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(setq whitewidth (- (current-column) begcol)))
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;; Delete the whitespace following the start column.
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(delete-region startpos (point))
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;; Open the desired width, plus same amount of whitespace we just deleted.
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(indent-to (+ endcol whitewidth))))
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;;;###autoload
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(defun string-rectangle (start end string)
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"Insert STRING on each line of the region-rectangle, shifting text right.
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The left edge of the rectangle specifies the column for insertion.
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This command does not delete or overwrite any existing text.
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Called from a program, takes three args; START, END and STRING."
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(interactive "r\nsString rectangle: ")
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(operate-on-rectangle 'string-rectangle-line start end t))
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(defun string-rectangle-line (startpos begextra endextra)
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(let (whitespace)
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(goto-char startpos)
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;; Compute horizontal width of following whitespace.
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(let ((ocol (current-column)))
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(skip-chars-forward " \t")
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(setq whitespace (- (current-column) ocol)))
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;; Delete the following whitespace.
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(delete-region startpos (point))
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;; Insert the desired string.
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(insert string)
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;; Insert the same width of whitespace that we had before.
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(indent-to (+ (current-column) whitespace))))
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;;;###autoload
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(defun clear-rectangle (start end)
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"Blank out rectangle with corners at point and mark.
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The text previously in the region is overwritten by the blanks.
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When called from a program, requires two args which specify the corners."
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(interactive "r")
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(operate-on-rectangle 'clear-rectangle-line start end t))
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(defun clear-rectangle-line (startpos begextra endextra)
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;; Find end of whitespace after the rectangle.
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(skip-chars-forward " \t")
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(let ((column (+ (current-column) endextra)))
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;; Delete the text in the rectangle, and following whitespace.
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(delete-region (point)
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(progn (goto-char startpos)
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(skip-chars-backward " \t")
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(point)))
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;; Reindent out to same column that we were at.
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(indent-to column)))
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(provide 'rect)
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;;; rect.el ends here
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