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744 lines
29 KiB
EmacsLisp
744 lines
29 KiB
EmacsLisp
;;; picture.el --- "Picture mode" -- editing using quarter-plane screen model
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;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
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;; Author: K. Shane Hartman
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;; Maintainer: FSF
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;; Keywords: convenience wp
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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 code provides the picture-mode commands documented in the Emacs
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;; manual. The screen is treated as a semi-infinite quarter-plane with
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;; support for rectangle operations and `etch-a-sketch' character
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;; insertion in any of eight directions.
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;;; Code:
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(defgroup picture nil
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"Picture mode --- editing using quarter-plane screen model."
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:prefix "picture-"
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:group 'editing)
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(defcustom picture-rectangle-ctl ?+
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"*Character `picture-draw-rectangle' uses for top left corners."
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:type 'character
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:group 'picture)
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(defcustom picture-rectangle-ctr ?+
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"*Character `picture-draw-rectangle' uses for top right corners."
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:type 'character
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:group 'picture)
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(defcustom picture-rectangle-cbr ?+
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"*Character `picture-draw-rectangle' uses for bottom right corners."
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:type 'character
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:group 'picture)
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(defcustom picture-rectangle-cbl ?+
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"*Character `picture-draw-rectangle' uses for bottom left corners."
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:type 'character
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:group 'picture)
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(defcustom picture-rectangle-v ?|
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"*Character `picture-draw-rectangle' uses for vertical lines."
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:type 'character
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:group 'picture)
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(defcustom picture-rectangle-h ?-
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"*Character `picture-draw-rectangle' uses for horizontal lines."
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:type 'character
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:group 'picture)
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;; Picture Movement Commands
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;; When a cursor is on a wide-column character (e.g. Chinese,
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;; Japanese, Korean), this variable tells the desired current column
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;; which may be different from (current-column).
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(defvar picture-desired-column 0)
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;; If the value of picture-desired-column is far from the current
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;; column, or if the arg ADJUST-TO-CURRENT is non-nil, set it to the
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;; current column. Return the current column.
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(defun picture-update-desired-column (adjust-to-current)
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(let ((current-column (current-column)))
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(if (or adjust-to-current
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(< picture-desired-column (1- current-column))
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(> picture-desired-column (1+ current-column)))
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(setq picture-desired-column current-column))
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current-column))
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(defun picture-beginning-of-line (&optional arg)
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"Position point at the beginning of the line.
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With ARG not nil, move forward ARG - 1 lines first.
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If scan reaches end of buffer, stop there without error."
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(interactive "P")
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(if arg (forward-line (1- (prefix-numeric-value arg))))
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(beginning-of-line)
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(setq picture-desired-column 0))
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(defun picture-end-of-line (&optional arg)
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"Position point after last non-blank character on current line.
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With ARG not nil, move forward ARG - 1 lines first.
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If scan reaches end of buffer, stop there without error."
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(interactive "P")
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(if arg (forward-line (1- (prefix-numeric-value arg))))
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(beginning-of-line)
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(skip-chars-backward " \t" (prog1 (point) (end-of-line)))
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(setq picture-desired-column (current-column)))
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(defun picture-forward-column (arg &optional interactive)
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"Move cursor right, making whitespace if necessary.
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With argument, move that many columns."
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(interactive "p\nd")
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(picture-update-desired-column interactive)
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(setq picture-desired-column (max 0 (+ picture-desired-column arg)))
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(let ((current-column (move-to-column picture-desired-column t)))
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(if (and (> current-column picture-desired-column)
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(< arg 0))
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;; It seems that we have just tried to move to the right
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;; column of a multi-column character.
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(forward-char -1))))
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(defun picture-backward-column (arg &optional interactive)
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"Move cursor left, making whitespace if necessary.
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With argument, move that many columns."
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(interactive "p\nd")
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(picture-update-desired-column interactive)
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(picture-forward-column (- arg)))
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(defun picture-move-down (arg)
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"Move vertically down, making whitespace if necessary.
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With argument, move that many lines."
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(interactive "p")
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(picture-update-desired-column nil)
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(picture-newline arg)
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(let ((current-column (move-to-column picture-desired-column t)))
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(if (> current-column picture-desired-column)
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(forward-char -1))))
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(defvar picture-vertical-step 0
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"Amount to move vertically after text character in Picture mode.")
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(defvar picture-horizontal-step 1
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"Amount to move horizontally after text character in Picture mode.")
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(defun picture-move-up (arg)
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"Move vertically up, making whitespace if necessary.
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With argument, move that many lines."
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(interactive "p")
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(picture-update-desired-column nil)
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(picture-move-down (- arg)))
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(defun picture-movement-right ()
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"Move right after self-inserting character in Picture mode."
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(interactive)
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(picture-set-motion 0 1))
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(defun picture-movement-left ()
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"Move left after self-inserting character in Picture mode."
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(interactive)
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(picture-set-motion 0 -1))
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(defun picture-movement-up ()
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"Move up after self-inserting character in Picture mode."
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(interactive)
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(picture-set-motion -1 0))
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(defun picture-movement-down ()
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"Move down after self-inserting character in Picture mode."
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(interactive)
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(picture-set-motion 1 0))
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(defun picture-movement-nw (&optional arg)
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"Move up and left after self-inserting character in Picture mode.
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With prefix argument, move up and two-column left."
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(interactive "P")
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(picture-set-motion -1 (if arg -2 -1)))
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(defun picture-movement-ne (&optional arg)
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"Move up and right after self-inserting character in Picture mode.
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With prefix argument, move up and two-column right."
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(interactive "P")
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(picture-set-motion -1 (if arg 2 1)))
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(defun picture-movement-sw (&optional arg)
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"Move down and left after self-inserting character in Picture mode.
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With prefix argument, move down and two-column left."
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(interactive "P")
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(picture-set-motion 1 (if arg -2 -1)))
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(defun picture-movement-se (&optional arg)
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"Move down and right after self-inserting character in Picture mode.
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With prefix argument, move down and two-column right."
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(interactive "P")
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(picture-set-motion 1 (if arg 2 1)))
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(defun picture-set-motion (vert horiz)
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"Set VERTICAL and HORIZONTAL increments for movement in Picture mode.
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The mode line is updated to reflect the current direction."
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(setq picture-vertical-step vert
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picture-horizontal-step horiz)
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(setq mode-name
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(format "Picture:%s"
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(nth (+ 2 (% horiz 3) (* 5 (1+ (% vert 2))))
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'(wnw nw up ne ene Left left none right Right
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wsw sw down se ese))))
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(force-mode-line-update)
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(message ""))
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(defun picture-move ()
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"Move in direction of `picture-vertical-step' and `picture-horizontal-step'."
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(if (/= picture-vertical-step 0)
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(picture-move-down picture-vertical-step))
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(if (/= picture-horizontal-step 0)
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(picture-forward-column picture-horizontal-step)))
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(defun picture-motion (arg)
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"Move point in direction of current picture motion in Picture mode.
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With ARG do it that many times. Useful for delineating rectangles in
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conjunction with diagonal picture motion.
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Do \\[command-apropos] picture-movement to see commands which control motion."
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(interactive "p")
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(picture-move-down (* arg picture-vertical-step))
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(picture-forward-column (* arg picture-horizontal-step)))
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(defun picture-motion-reverse (arg)
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"Move point in direction opposite of current picture motion in Picture mode.
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With ARG do it that many times. Useful for delineating rectangles in
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conjunction with diagonal picture motion.
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Do \\[command-apropos] `picture-movement' to see commands which control motion."
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(interactive "p")
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(picture-motion (- arg)))
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;; Picture insertion and deletion.
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(defun picture-insert (ch arg)
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(let* ((width (char-width ch))
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;; We must be sure that the succeeding insertion won't delete
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;; the just inserted character.
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(picture-horizontal-step
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(if (and (= picture-vertical-step 0)
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(> width 1)
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(< (abs picture-horizontal-step) 2))
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(* picture-horizontal-step 2)
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picture-horizontal-step)))
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(while (> arg 0)
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(setq arg (1- arg))
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(if (/= picture-desired-column (current-column))
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(move-to-column picture-desired-column t))
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(let ((col (+ picture-desired-column width)))
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(or (eolp)
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(let ((pos (point)))
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(move-to-column col t)
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(delete-region pos (point)))))
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(insert ch)
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(forward-char -1)
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(picture-move))))
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(defun picture-self-insert (arg)
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"Insert this character in place of character previously at the cursor.
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The cursor then moves in the direction you previously specified
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with the commands `picture-movement-right', `picture-movement-up', etc.
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Do \\[command-apropos] `picture-movement' to see those commands."
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(interactive "p")
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(picture-update-desired-column (not (eq this-command last-command)))
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(picture-insert last-command-event arg)) ; Always a character in this case.
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(defun picture-clear-column (arg)
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"Clear out ARG columns after point without moving."
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(interactive "p")
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(let* ((original-col (current-column))
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(target-col (max 0 (+ original-col arg)))
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pos)
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(move-to-column target-col t)
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(setq pos (point))
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(move-to-column original-col)
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(delete-region pos (point))
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(save-excursion
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(indent-to (max target-col original-col))))
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(setq picture-desired-column (current-column)))
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(defun picture-backward-clear-column (arg)
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"Clear out ARG columns before point, moving back over them."
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(interactive "p")
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(picture-clear-column (- arg)))
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(defun picture-clear-line (arg)
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"Clear out rest of line; if at end of line, advance to next line.
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Cleared-out line text goes into the kill ring, as do newlines that are
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advanced over. With argument, clear out (and save in kill ring) that
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many lines."
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(interactive "P")
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(if arg
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(progn
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(setq arg (prefix-numeric-value arg))
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(kill-line arg)
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(newline (if (> arg 0) arg (- arg))))
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(if (looking-at "[ \t]*$")
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(kill-ring-save (point) (progn (forward-line 1) (point)))
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(kill-region (point) (progn (end-of-line) (point))))))
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(defun picture-newline (arg)
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"Move to the beginning of the following line.
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With argument, moves that many lines (up, if negative argument);
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always moves to the beginning of a line."
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(interactive "p")
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(if (< arg 0)
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(forward-line arg)
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(while (> arg 0)
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(end-of-line)
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(if (eobp) (newline) (forward-char 1))
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(setq arg (1- arg)))))
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(defun picture-open-line (arg)
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"Insert an empty line after the current line.
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With positive argument insert that many lines."
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(interactive "p")
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(save-excursion
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(end-of-line)
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(open-line arg)))
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(defun picture-duplicate-line ()
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"Insert a duplicate of the current line, below it."
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(interactive)
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(save-excursion
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(let ((contents
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(buffer-substring
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(progn (beginning-of-line) (point))
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(progn (picture-newline 1) (point)))))
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(forward-line -1)
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(insert contents))))
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;; Like replace-match, but overwrites.
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(defun picture-replace-match (newtext fixedcase literal)
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(let (ocolumn change pos)
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(goto-char (setq pos (match-end 0)))
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(setq ocolumn (current-column))
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;; Make the replacement and undo it, to see how it changes the length.
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(let ((buffer-undo-list nil)
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list1)
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(replace-match newtext fixedcase literal)
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(setq change (- (current-column) ocolumn))
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(setq list1 buffer-undo-list)
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(while list1
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(setq list1 (primitive-undo 1 list1))))
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(goto-char pos)
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(if (> change 0)
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(delete-region (point)
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(progn
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(move-to-column (+ change (current-column)) t)
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(point))))
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(replace-match newtext fixedcase literal)
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(if (< change 0)
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(insert-char ?\ (- change)))))
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;; Picture Tabs
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(defcustom picture-tab-chars "!-~"
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"*A character set which controls behavior of commands.
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\\[picture-set-tab-stops] and \\[picture-tab-search]. It is NOT a
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regular expression, any regexp special characters will be quoted.
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It defines a set of \"interesting characters\" to look for when setting
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\(or searching for) tab stops, initially \"!-~\" (all printing characters).
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For example, suppose that you are editing a table which is formatted thus:
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| foo | bar + baz | 23 *
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| bubbles | and + etc | 97 *
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and that `picture-tab-chars' is \"|+*\". Then invoking
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\\[picture-set-tab-stops] on either of the previous lines would result
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in the following tab stops
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: : : :
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Another example - \"A-Za-z0-9\" would produce the tab stops
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: : : :
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Note that if you want the character `-' to be in the set, it must be
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included in a range or else appear in a context where it cannot be
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taken for indicating a range (e.g. \"-A-Z\" declares the set to be the
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letters `A' through `Z' and the character `-'). If you want the
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character `\\' in the set it must be preceded by itself: \"\\\\\".
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The command \\[picture-tab-search] is defined to move beneath (or to) a
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character belonging to this set independent of the tab stops list."
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:type 'string
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:group 'picture)
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(defun picture-set-tab-stops (&optional arg)
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"Set value of `tab-stop-list' according to context of this line.
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This controls the behavior of \\[picture-tab]. A tab stop is set at
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every column occupied by an \"interesting character\" that is preceded
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by whitespace. Interesting characters are defined by the variable
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`picture-tab-chars', see its documentation for an example of usage.
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With ARG, just (re)set `tab-stop-list' to its default value. The tab
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stops computed are displayed in the minibuffer with `:' at each stop."
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(interactive "P")
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(save-excursion
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(let (tabs)
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(if arg
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(setq tabs (default-value 'tab-stop-list))
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(let ((regexp (concat "[ \t]+[" (regexp-quote picture-tab-chars) "]")))
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(beginning-of-line)
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(let ((bol (point)))
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(end-of-line)
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(while (re-search-backward regexp bol t)
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(skip-chars-forward " \t")
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(setq tabs (cons (current-column) tabs)))
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(if (null tabs)
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(error "No characters in set %s on this line"
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(regexp-quote picture-tab-chars))))))
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(setq tab-stop-list tabs)
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(let ((blurb (make-string (1+ (nth (1- (length tabs)) tabs)) ?\ )))
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(while tabs
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(aset blurb (car tabs) ?:)
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(setq tabs (cdr tabs)))
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(message blurb)))))
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(defun picture-tab-search (&optional arg)
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"Move to column beneath next interesting char in previous line.
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With ARG move to column occupied by next interesting character in this
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line. The character must be preceded by whitespace.
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\"interesting characters\" are defined by variable `picture-tab-chars'.
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If no such character is found, move to beginning of line."
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(interactive "P")
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(let ((target (current-column)))
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(save-excursion
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(if (and (not arg)
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(progn
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(beginning-of-line)
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(skip-chars-backward
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(concat "^" (regexp-quote picture-tab-chars))
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(point-min))
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(not (bobp))))
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(move-to-column target))
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(if (re-search-forward
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(concat "[ \t]+[" (regexp-quote picture-tab-chars) "]")
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(save-excursion (end-of-line) (point))
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'move)
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(setq target (1- (current-column)))
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(setq target nil)))
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(if target
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(move-to-column target t)
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(beginning-of-line))))
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(defun picture-tab (&optional arg)
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"Tab transparently (just move point) to next tab stop.
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With prefix arg, overwrite the traversed text with spaces. The tab stop
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list can be changed by \\[picture-set-tab-stops] and \\[edit-tab-stops].
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See also documentation for variable `picture-tab-chars'."
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(interactive "P")
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(let* ((opoint (point)))
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(move-to-tab-stop)
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(if arg
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(let (indent-tabs-mode
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(column (current-column)))
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(delete-region opoint (point))
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(indent-to column)))))
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;; Picture Rectangles
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(defvar picture-killed-rectangle nil
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"Rectangle killed or copied by \\[picture-clear-rectangle] in Picture mode.
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The contents can be retrieved by \\[picture-yank-rectangle]")
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(defun picture-clear-rectangle (start end &optional killp)
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"Clear and save rectangle delineated by point and mark.
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The rectangle is saved for yanking by \\[picture-yank-rectangle] and replaced
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with whitespace. The previously saved rectangle, if any, is lost. With
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prefix argument, the rectangle is actually killed, shifting remaining text."
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(interactive "r\nP")
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(setq picture-killed-rectangle (picture-snarf-rectangle start end killp)))
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(defun picture-clear-rectangle-to-register (start end register &optional killp)
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"Clear rectangle delineated by point and mark into REGISTER.
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The rectangle is saved in REGISTER and replaced with whitespace. With
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prefix argument, the rectangle is actually killed, shifting remaining text."
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(interactive "r\ncRectangle to register: \nP")
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||
(set-register register (picture-snarf-rectangle start end killp)))
|
||
|
||
(defun picture-snarf-rectangle (start end &optional killp)
|
||
(let ((column (current-column))
|
||
(indent-tabs-mode nil))
|
||
(prog1 (save-excursion
|
||
(if killp
|
||
(delete-extract-rectangle start end)
|
||
(prog1 (extract-rectangle start end)
|
||
(clear-rectangle start end))))
|
||
(move-to-column column t))))
|
||
|
||
(defun picture-yank-rectangle (&optional insertp)
|
||
"Overlay rectangle saved by \\[picture-clear-rectangle]
|
||
The rectangle is positioned with upper left corner at point, overwriting
|
||
existing text. With prefix argument, the rectangle is inserted instead,
|
||
shifting existing text. Leaves mark at one corner of rectangle and
|
||
point at the other (diagonally opposed) corner."
|
||
(interactive "P")
|
||
(if (not (consp picture-killed-rectangle))
|
||
(error "No rectangle saved")
|
||
(picture-insert-rectangle picture-killed-rectangle insertp)))
|
||
|
||
(defun picture-yank-at-click (click arg)
|
||
"Insert the last killed rectangle at the position clicked on.
|
||
Also move point to one end of the text thus inserted (normally the end).
|
||
Prefix arguments are interpreted as with \\[yank].
|
||
If `mouse-yank-at-point' is non-nil, insert at point
|
||
regardless of where you click."
|
||
(interactive "e\nP")
|
||
(or mouse-yank-at-point (mouse-set-point click))
|
||
(picture-yank-rectangle arg))
|
||
|
||
(defun picture-yank-rectangle-from-register (register &optional insertp)
|
||
"Overlay rectangle saved in REGISTER.
|
||
The rectangle is positioned with upper left corner at point, overwriting
|
||
existing text. With prefix argument, the rectangle is
|
||
inserted instead, shifting existing text. Leaves mark at one corner
|
||
of rectangle and point at the other (diagonally opposed) corner."
|
||
(interactive "cRectangle from register: \nP")
|
||
(let ((rectangle (get-register register)))
|
||
(if (not (consp rectangle))
|
||
(error "Register %c does not contain a rectangle" register)
|
||
(picture-insert-rectangle rectangle insertp))))
|
||
|
||
(defun picture-insert-rectangle (rectangle &optional insertp)
|
||
"Overlay RECTANGLE with upper left corner at point.
|
||
Optional argument INSERTP, if non-nil causes RECTANGLE to be inserted.
|
||
Leaves the region surrounding the rectangle."
|
||
(let ((indent-tabs-mode nil))
|
||
(if (not insertp)
|
||
(save-excursion
|
||
(delete-rectangle (point)
|
||
(progn
|
||
(picture-forward-column (length (car rectangle)))
|
||
(picture-move-down (1- (length rectangle)))
|
||
(point)))))
|
||
(push-mark)
|
||
(insert-rectangle rectangle)))
|
||
|
||
(defun picture-current-line ()
|
||
"Return the vertical position of point. Top line is 1."
|
||
(+ (count-lines (point-min) (point))
|
||
(if (= (current-column) 0) 1 0)))
|
||
|
||
(defun picture-draw-rectangle (start end)
|
||
"Draw a rectangle around region."
|
||
(interactive "*r") ; start will be less than end
|
||
(let* ((sl (picture-current-line))
|
||
(sc (current-column))
|
||
(pvs picture-vertical-step)
|
||
(phs picture-horizontal-step)
|
||
(c1 (progn (goto-char start) (current-column)))
|
||
(r1 (picture-current-line))
|
||
(c2 (progn (goto-char end) (current-column)))
|
||
(r2 (picture-current-line))
|
||
(right (max c1 c2))
|
||
(left (min c1 c2))
|
||
(top (min r1 r2))
|
||
(bottom (max r1 r2)))
|
||
(goto-line top)
|
||
(move-to-column left t)
|
||
(picture-update-desired-column t)
|
||
|
||
(picture-movement-right)
|
||
(picture-insert picture-rectangle-ctl 1)
|
||
(picture-insert picture-rectangle-h (- right picture-desired-column))
|
||
|
||
(picture-movement-down)
|
||
(picture-insert picture-rectangle-ctr 1)
|
||
(picture-insert picture-rectangle-v (- bottom (picture-current-line)))
|
||
|
||
(picture-movement-left)
|
||
(picture-insert picture-rectangle-cbr 1)
|
||
(picture-insert picture-rectangle-h (- picture-desired-column left))
|
||
|
||
(picture-movement-up)
|
||
(picture-insert picture-rectangle-cbl 1)
|
||
(picture-insert picture-rectangle-v (- (picture-current-line) top))
|
||
|
||
(picture-set-motion pvs phs)
|
||
(goto-line sl)
|
||
(move-to-column sc t)))
|
||
|
||
|
||
;; Picture Keymap, entry and exit points.
|
||
|
||
(defvar picture-mode-map nil)
|
||
|
||
(defun picture-substitute (oldfun newfun)
|
||
(substitute-key-definition oldfun newfun picture-mode-map global-map))
|
||
|
||
(if (not picture-mode-map)
|
||
(progn
|
||
(setq picture-mode-map (make-keymap))
|
||
(picture-substitute 'self-insert-command 'picture-self-insert)
|
||
(picture-substitute 'completion-separator-self-insert-command
|
||
'picture-self-insert)
|
||
(picture-substitute 'completion-separator-self-insert-autofilling
|
||
'picture-self-insert)
|
||
(picture-substitute 'forward-char 'picture-forward-column)
|
||
(picture-substitute 'backward-char 'picture-backward-column)
|
||
(picture-substitute 'delete-char 'picture-clear-column)
|
||
;; There are two possibilities for what is normally on DEL.
|
||
(picture-substitute 'backward-delete-char-untabify 'picture-backward-clear-column)
|
||
(picture-substitute 'delete-backward-char 'picture-backward-clear-column)
|
||
(picture-substitute 'kill-line 'picture-clear-line)
|
||
(picture-substitute 'open-line 'picture-open-line)
|
||
(picture-substitute 'newline 'picture-newline)
|
||
(picture-substitute 'newline-and-indent 'picture-duplicate-line)
|
||
(picture-substitute 'next-line 'picture-move-down)
|
||
(picture-substitute 'previous-line 'picture-move-up)
|
||
(picture-substitute 'beginning-of-line 'picture-beginning-of-line)
|
||
(picture-substitute 'end-of-line 'picture-end-of-line)
|
||
|
||
(define-key picture-mode-map "\C-c\C-d" 'delete-char)
|
||
(define-key picture-mode-map "\e\t" 'picture-toggle-tab-state)
|
||
(define-key picture-mode-map "\t" 'picture-tab)
|
||
(define-key picture-mode-map "\e\t" 'picture-tab-search)
|
||
(define-key picture-mode-map "\C-c\t" 'picture-set-tab-stops)
|
||
(define-key picture-mode-map "\C-c\C-k" 'picture-clear-rectangle)
|
||
(define-key picture-mode-map "\C-c\C-w" 'picture-clear-rectangle-to-register)
|
||
(define-key picture-mode-map "\C-c\C-y" 'picture-yank-rectangle)
|
||
(define-key picture-mode-map "\C-c\C-x" 'picture-yank-rectangle-from-register)
|
||
(define-key picture-mode-map "\C-c\C-r" 'picture-draw-rectangle)
|
||
(define-key picture-mode-map "\C-c\C-c" 'picture-mode-exit)
|
||
(define-key picture-mode-map "\C-c\C-f" 'picture-motion)
|
||
(define-key picture-mode-map "\C-c\C-b" 'picture-motion-reverse)
|
||
(define-key picture-mode-map "\C-c<" 'picture-movement-left)
|
||
(define-key picture-mode-map "\C-c>" 'picture-movement-right)
|
||
(define-key picture-mode-map "\C-c^" 'picture-movement-up)
|
||
(define-key picture-mode-map "\C-c." 'picture-movement-down)
|
||
(define-key picture-mode-map "\C-c`" 'picture-movement-nw)
|
||
(define-key picture-mode-map "\C-c'" 'picture-movement-ne)
|
||
(define-key picture-mode-map "\C-c/" 'picture-movement-sw)
|
||
(define-key picture-mode-map "\C-c\\" 'picture-movement-se)))
|
||
|
||
(defcustom picture-mode-hook nil
|
||
"If non-nil, its value is called on entry to Picture mode.
|
||
Picture mode is invoked by the command \\[picture-mode]."
|
||
:type 'hook
|
||
:group 'picture)
|
||
|
||
(defvar picture-mode-old-local-map)
|
||
(defvar picture-mode-old-mode-name)
|
||
(defvar picture-mode-old-major-mode)
|
||
(defvar picture-mode-old-truncate-lines)
|
||
|
||
;;;###autoload
|
||
(defun picture-mode ()
|
||
"Switch to Picture mode, in which a quarter-plane screen model is used.
|
||
Printing characters replace instead of inserting themselves with motion
|
||
afterwards settable by these commands:
|
||
C-c < Move left after insertion.
|
||
C-c > Move right after insertion.
|
||
C-c ^ Move up after insertion.
|
||
C-c . Move down after insertion.
|
||
C-c ` Move northwest (nw) after insertion.
|
||
C-c ' Move northeast (ne) after insertion.
|
||
C-c / Move southwest (sw) after insertion.
|
||
C-c \\ Move southeast (se) after insertion.
|
||
C-u C-c ` Move westnorthwest (wnw) after insertion.
|
||
C-u C-c ' Move eastnortheast (ene) after insertion.
|
||
C-u C-c / Move westsouthwest (wsw) after insertion.
|
||
C-u C-c \\ Move eastsoutheast (ese) after insertion.
|
||
The current direction is displayed in the mode line. The initial
|
||
direction is right. Whitespace is inserted and tabs are changed to
|
||
spaces when required by movement. You can move around in the buffer
|
||
with these commands:
|
||
\\[picture-move-down] Move vertically to SAME column in previous line.
|
||
\\[picture-move-up] Move vertically to SAME column in next line.
|
||
\\[picture-end-of-line] Move to column following last non-whitespace character.
|
||
\\[picture-forward-column] Move right inserting spaces if required.
|
||
\\[picture-backward-column] Move left changing tabs to spaces if required.
|
||
C-c C-f Move in direction of current picture motion.
|
||
C-c C-b Move in opposite direction of current picture motion.
|
||
Return Move to beginning of next line.
|
||
You can edit tabular text with these commands:
|
||
M-Tab Move to column beneath (or at) next interesting character.
|
||
`Indents' relative to a previous line.
|
||
Tab Move to next stop in tab stop list.
|
||
C-c Tab Set tab stops according to context of this line.
|
||
With ARG resets tab stops to default (global) value.
|
||
See also documentation of variable picture-tab-chars
|
||
which defines \"interesting character\". You can manually
|
||
change the tab stop list with command \\[edit-tab-stops].
|
||
You can manipulate text with these commands:
|
||
C-d Clear (replace) ARG columns after point without moving.
|
||
C-c C-d Delete char at point - the command normally assigned to C-d.
|
||
\\[picture-backward-clear-column] Clear (replace) ARG columns before point, moving back over them.
|
||
\\[picture-clear-line] Clear ARG lines, advancing over them. The cleared
|
||
text is saved in the kill ring.
|
||
\\[picture-open-line] Open blank line(s) beneath current line.
|
||
You can manipulate rectangles with these commands:
|
||
C-c C-k Clear (or kill) a rectangle and save it.
|
||
C-c C-w Like C-c C-k except rectangle is saved in named register.
|
||
C-c C-y Overlay (or insert) currently saved rectangle at point.
|
||
C-c C-x Like C-c C-y except rectangle is taken from named register.
|
||
C-c C-r Draw a rectangular box around mark and point.
|
||
\\[copy-rectangle-to-register] Copies a rectangle to a register.
|
||
\\[advertised-undo] Can undo effects of rectangle overlay commands
|
||
commands if invoked soon enough.
|
||
You can return to the previous mode with:
|
||
C-c C-c Which also strips trailing whitespace from every line.
|
||
Stripping is suppressed by supplying an argument.
|
||
|
||
Entry to this mode calls the value of `picture-mode-hook' if non-nil.
|
||
|
||
Note that Picture mode commands will work outside of Picture mode, but
|
||
they are not defaultly assigned to keys."
|
||
(interactive)
|
||
(if (eq major-mode 'picture-mode)
|
||
(error "You are already editing a picture")
|
||
(set (make-local-variable 'picture-mode-old-local-map) (current-local-map))
|
||
(use-local-map picture-mode-map)
|
||
(set (make-local-variable 'picture-mode-old-mode-name) mode-name)
|
||
(set (make-local-variable 'picture-mode-old-major-mode) major-mode)
|
||
(setq major-mode 'picture-mode)
|
||
(set (make-local-variable 'picture-killed-rectangle) nil)
|
||
(set (make-local-variable 'tab-stop-list) (default-value 'tab-stop-list))
|
||
(set (make-local-variable 'picture-tab-chars)
|
||
(default-value 'picture-tab-chars))
|
||
(make-local-variable 'picture-vertical-step)
|
||
(make-local-variable 'picture-horizontal-step)
|
||
(set (make-local-variable 'picture-mode-old-truncate-lines) truncate-lines)
|
||
(setq truncate-lines t)
|
||
(picture-set-motion 0 1)
|
||
|
||
;; edit-picture-hook is what we used to run, picture-mode-hook is in doc.
|
||
(run-hooks 'edit-picture-hook 'picture-mode-hook)
|
||
(message "Type %s in this buffer to return it to %s mode."
|
||
(substitute-command-keys "\\[picture-mode-exit]")
|
||
picture-mode-old-mode-name)))
|
||
|
||
;;;###autoload
|
||
(defalias 'edit-picture 'picture-mode)
|
||
|
||
(defun picture-mode-exit (&optional nostrip)
|
||
"Undo `picture-mode' and return to previous major mode.
|
||
With no argument strips whitespace from end of every line in Picture buffer
|
||
otherwise just return to previous mode."
|
||
(interactive "P")
|
||
(if (not (eq major-mode 'picture-mode))
|
||
(error "You aren't editing a Picture")
|
||
(if (not nostrip) (delete-trailing-whitespace))
|
||
(setq mode-name picture-mode-old-mode-name)
|
||
(use-local-map picture-mode-old-local-map)
|
||
(setq major-mode picture-mode-old-major-mode)
|
||
(kill-local-variable 'tab-stop-list)
|
||
(setq truncate-lines picture-mode-old-truncate-lines)
|
||
(force-mode-line-update)))
|
||
|
||
(provide 'picture)
|
||
|
||
;;; picture.el ends here
|