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d791cc3bc2
* rect.el (rectangle-mark-mode): When the region is not active, display a message saying that the mark as been set and that rectangle mode is in use. (rectangle--highlight-for-redisplay): Only put an overlay with a visible vertical bar when (display-graphic-p) is non-nil. This partially fixes Bug#16403.
578 lines
22 KiB
EmacsLisp
578 lines
22 KiB
EmacsLisp
;;; rect.el --- rectangle functions for GNU Emacs -*- lexical-binding:t -*-
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;; Copyright (C) 1985, 1999-2014 Free Software Foundation, Inc.
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;; Maintainer: Didier Verna <didier@xemacs.org>
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;; Keywords: internal
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;; Package: emacs
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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 3 of the License, or
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;; (at your option) 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. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This package provides the operations on rectangles that are documented
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;; in the Emacs manual.
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;; ### NOTE: this file was almost completely rewritten by Didier Verna
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;; <didier@xemacs.org> in July 1999.
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;;; Code:
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;; FIXME: this function should be replaced by `apply-on-rectangle'
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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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(if coerce-tabs
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(move-to-column startcol t)
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(move-to-column startcol))
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(setq begextra (- (current-column) startcol))
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(setq startpos (point))
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(if coerce-tabs
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(move-to-column endcol t)
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(move-to-column endcol))
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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 apply-on-rectangle (function start end &rest args)
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"Call FUNCTION for each line of rectangle with corners at START, END.
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FUNCTION is called with two arguments: the start and end columns of the
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rectangle, plus ARGS extra arguments. Point is at the beginning of line when
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the function is called.
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The final point after the last operation will be returned."
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(let (startcol startpt endcol endpt final-point)
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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 startpt (point))
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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 endpt (point-marker))
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;; ensure the start column is the left one.
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(if (< endcol startcol)
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(let ((col startcol))
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(setq startcol endcol endcol col)))
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;; start looping over lines
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(goto-char startpt)
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(while (< (point) endpt)
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(apply function startcol endcol args)
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(setq final-point (point))
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(forward-line 1)))
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final-point))
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(defun delete-rectangle-line (startcol endcol fill)
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(when (= (move-to-column startcol (if fill t 'coerce)) startcol)
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(delete-region (point)
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(progn (move-to-column endcol 'coerce)
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(point)))))
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(defun delete-extract-rectangle-line (startcol endcol lines fill)
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(let ((pt (point-at-eol)))
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(if (< (move-to-column startcol (if fill t 'coerce)) startcol)
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(setcdr lines (cons (spaces-string (- endcol startcol))
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(cdr lines)))
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;; else
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(setq pt (point))
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(move-to-column endcol t)
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(setcdr lines (cons (filter-buffer-substring pt (point) t) (cdr lines))))
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))
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;; This is actually the only function that needs to do complicated
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;; stuff like what's happening in `operate-on-rectangle', because the
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;; buffer might be read-only.
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(defun extract-rectangle-line (startcol endcol lines)
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(let (start end begextra endextra line)
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(move-to-column startcol)
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(setq start (point)
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begextra (- (current-column) startcol))
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(move-to-column endcol)
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(setq end (point)
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endextra (- endcol (current-column)))
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(setq line (buffer-substring start (point)))
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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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(if (< endextra 0)
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(setq endextra 0))
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(goto-char start)
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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)
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(- (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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(setcdr lines (cons line (cdr lines)))))
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(defconst spaces-strings
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'["" " " " " " " " " " " " " " " " "])
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(defun spaces-string (n)
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"Return a string with N spaces."
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(if (<= n 8) (aref spaces-strings n)
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(make-string n ?\s)))
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;;;###autoload
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(defun delete-rectangle (start end &optional fill)
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"Delete (don't save) text in the region-rectangle.
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The same range of columns is deleted in each line starting with the
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line where the region begins and ending with the line where the region
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ends.
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When called from a program the rectangle's corners are START and END.
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With a prefix (or a FILL) argument, also fill lines where nothing has
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to be deleted."
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(interactive "*r\nP")
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(apply-on-rectangle 'delete-rectangle-line start end fill))
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;;;###autoload
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(defun delete-extract-rectangle (start end &optional fill)
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"Delete the contents of the rectangle with corners at START and END.
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Return it as a list of strings, one for each line of the rectangle.
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When called from a program the rectangle's corners are START and END.
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With an optional FILL argument, also fill lines where nothing has to be
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deleted."
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(let ((lines (list nil)))
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(apply-on-rectangle 'delete-extract-rectangle-line start end lines fill)
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(nreverse (cdr lines))))
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;;;###autoload
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(defun extract-rectangle (start end)
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"Return the contents of the rectangle with corners at START and END.
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Return it as a list of strings, one for each line of the rectangle."
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(let ((lines (list nil)))
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(apply-on-rectangle 'extract-rectangle-line start end lines)
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(nreverse (cdr 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 &optional fill)
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"Delete the region-rectangle and save it as the last killed one.
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When called from a program the rectangle's corners are START and END.
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You might prefer to use `delete-extract-rectangle' from a program.
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With a prefix (or a FILL) argument, also fill lines where nothing has to be
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deleted.
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If the buffer is read-only, Emacs will beep and refrain from deleting
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the rectangle, but put it in the kill ring anyway. This means that
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you can use this command to copy text from a read-only buffer.
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\(If the variable `kill-read-only-ok' is non-nil, then this won't
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even beep.)"
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(interactive "r\nP")
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(condition-case nil
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(setq killed-rectangle (delete-extract-rectangle start end fill))
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((buffer-read-only text-read-only)
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(setq deactivate-mark t)
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(setq killed-rectangle (extract-rectangle start end))
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(if kill-read-only-ok
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(progn (message "Read only text copied to kill ring") nil)
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(barf-if-buffer-read-only)
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(signal 'text-read-only (list (current-buffer)))))))
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;;;###autoload
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(defun copy-rectangle-as-kill (start end)
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"Copy the region-rectangle and save it as the last killed one."
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(interactive "r")
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(setq killed-rectangle (extract-rectangle start end))
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(setq deactivate-mark t)
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(if (called-interactively-p 'interactive)
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(indicate-copied-region (length (car killed-rectangle)))))
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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-for-yank (car lines))
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(setq lines (cdr lines)))))
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;;;###autoload
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(defun open-rectangle (start end &optional fill)
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"Blank out the region-rectangle, 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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When called from a program the rectangle's corners are START and END.
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With a prefix (or a FILL) argument, fill with blanks even if there is
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no text on the right side of the rectangle."
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(interactive "*r\nP")
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(apply-on-rectangle 'open-rectangle-line start end fill)
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(goto-char start))
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(defun open-rectangle-line (startcol endcol fill)
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(when (= (move-to-column startcol (if fill t 'coerce)) startcol)
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(unless (and (not fill)
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(= (point) (point-at-eol)))
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(indent-to endcol))))
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(defun delete-whitespace-rectangle-line (startcol _endcol fill)
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(when (= (move-to-column startcol (if fill t 'coerce)) startcol)
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(unless (= (point) (point-at-eol))
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(delete-region (point) (progn (skip-syntax-forward " ") (point))))))
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;;;###autoload
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(defalias 'close-rectangle 'delete-whitespace-rectangle) ;; Old name
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;;;###autoload
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(defun delete-whitespace-rectangle (start end &optional fill)
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"Delete all whitespace following a specified column in each line.
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The left edge of the rectangle specifies the position in each line
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at which whitespace deletion should begin. On each line in the
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rectangle, all continuous whitespace starting at that column is deleted.
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When called from a program the rectangle's corners are START and END.
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With a prefix (or a FILL) argument, also fill too short lines."
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(interactive "*r\nP")
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(apply-on-rectangle 'delete-whitespace-rectangle-line start end fill))
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(defvar string-rectangle-history nil)
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(defun string-rectangle-line (startcol endcol string delete)
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(move-to-column startcol t)
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(if delete
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(delete-rectangle-line startcol endcol nil))
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(insert string))
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;;;###autoload
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(defun string-rectangle (start end string)
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"Replace rectangle contents with STRING on each line.
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The length of STRING need not be the same as the rectangle width.
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Called from a program, takes three args; START, END and STRING."
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(interactive
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(progn (barf-if-buffer-read-only)
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(list
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(region-beginning)
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(region-end)
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(read-string (format "String rectangle (default %s): "
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(or (car string-rectangle-history) ""))
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nil 'string-rectangle-history
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(car string-rectangle-history)))))
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(goto-char
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(apply-on-rectangle 'string-rectangle-line start end string t)))
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;;;###autoload
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(defalias 'replace-rectangle 'string-rectangle)
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;;;###autoload
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(defun string-insert-rectangle (start end string)
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"Insert STRING on each line of region-rectangle, shifting text right.
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When called from a program, the rectangle's corners are START and END.
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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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(interactive
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(progn (barf-if-buffer-read-only)
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(list
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(region-beginning)
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(region-end)
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(read-string (format "String insert rectangle (default %s): "
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(or (car string-rectangle-history) ""))
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nil 'string-rectangle-history
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(car string-rectangle-history)))))
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(apply-on-rectangle 'string-rectangle-line start end string nil))
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;;;###autoload
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(defun clear-rectangle (start end &optional fill)
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"Blank out the region-rectangle.
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The text previously in the region is overwritten with blanks.
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When called from a program the rectangle's corners are START and END.
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With a prefix (or a FILL) argument, also fill with blanks the parts of the
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rectangle which were empty."
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(interactive "*r\nP")
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(apply-on-rectangle 'clear-rectangle-line start end fill))
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(defun clear-rectangle-line (startcol endcol fill)
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(let ((pt (point-at-eol)))
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(when (= (move-to-column startcol (if fill t 'coerce)) startcol)
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(if (and (not fill)
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(<= (save-excursion (goto-char pt) (current-column)) endcol))
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(delete-region (point) pt)
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;; else
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(setq pt (point))
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(move-to-column endcol t)
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(setq endcol (current-column))
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(delete-region pt (point))
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(indent-to endcol)))))
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;; Line numbers for `rectangle-number-line-callback'.
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(defvar rectangle-number-line-counter)
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(defun rectangle-number-line-callback (start _end format-string)
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(move-to-column start t)
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(insert (format format-string rectangle-number-line-counter))
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(setq rectangle-number-line-counter
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(1+ rectangle-number-line-counter)))
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(defun rectange--default-line-number-format (start end start-at)
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(concat "%"
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(int-to-string (length (int-to-string (+ (count-lines start end)
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start-at))))
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"d "))
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;;;###autoload
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(defun rectangle-number-lines (start end start-at &optional format)
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"Insert numbers in front of the region-rectangle.
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START-AT, if non-nil, should be a number from which to begin
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counting. FORMAT, if non-nil, should be a format string to pass
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to `format' along with the line count. When called interactively
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with a prefix argument, prompt for START-AT and FORMAT."
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(interactive
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(if current-prefix-arg
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(let* ((start (region-beginning))
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(end (region-end))
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(start-at (read-number "Number to count from: " 1)))
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(list start end start-at
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(read-string "Format string: "
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(rectange--default-line-number-format
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start end start-at))))
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(list (region-beginning) (region-end) 1 nil)))
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(unless format
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(setq format (rectange--default-line-number-format start end start-at)))
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(let ((rectangle-number-line-counter start-at))
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(apply-on-rectangle 'rectangle-number-line-callback
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start end format)))
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;;; New rectangle integration with kill-ring.
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;; FIXME: known problems with the new rectangle support:
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;; - lots of commands handle the region without paying attention to its
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;; rectangular shape.
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(add-function :around redisplay-highlight-region-function
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#'rectangle--highlight-for-redisplay)
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(add-function :around redisplay-unhighlight-region-function
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#'rectangle--unhighlight-for-redisplay)
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(add-function :around region-extract-function
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#'rectangle--extract-region)
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(defvar rectangle-mark-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map [?\C-o] 'open-rectangle)
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(define-key map [?\C-t] 'string-rectangle)
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;; (define-key map [remap open-line] 'open-rectangle)
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;; (define-key map [remap transpose-chars] 'string-rectangle)
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map)
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"Keymap used while marking a rectangular region.")
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;;;###autoload
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(define-minor-mode rectangle-mark-mode
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"Toggle the region as rectangular.
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Activates the region if needed. Only lasts until the region is deactivated."
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nil nil nil
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(when rectangle-mark-mode
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(add-hook 'deactivate-mark-hook
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(lambda () (rectangle-mark-mode -1)))
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(unless (region-active-p)
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(push-mark)
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(activate-mark)
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(message "Mark set (rectangle mode)"))))
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(defun rectangle--extract-region (orig &optional delete)
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(if (not rectangle-mark-mode)
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(funcall orig delete)
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(let* ((strs (funcall (if delete
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#'delete-extract-rectangle
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#'extract-rectangle)
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(region-beginning) (region-end)))
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(str (mapconcat #'identity strs "\n")))
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(when (eq last-command 'kill-region)
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;; Try to prevent kill-region from appending this to some
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;; earlier element.
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(setq last-command 'kill-region-dont-append))
|
|
(when strs
|
|
(put-text-property 0 (length str) 'yank-handler
|
|
`(rectangle--insert-for-yank ,strs t)
|
|
str)
|
|
str))))
|
|
|
|
(defun rectangle--insert-for-yank (strs)
|
|
(push (point) buffer-undo-list)
|
|
(let ((undo-at-start buffer-undo-list))
|
|
(insert-rectangle strs)
|
|
(setq yank-undo-function
|
|
(lambda (_start _end)
|
|
(undo-start)
|
|
(setcar undo-at-start nil) ;Turn it into a boundary.
|
|
(while (not (eq pending-undo-list (cdr undo-at-start)))
|
|
(undo-more 1))))))
|
|
|
|
(defun rectangle--highlight-for-redisplay (orig start end window rol)
|
|
(cond
|
|
((not rectangle-mark-mode)
|
|
(funcall orig start end window rol))
|
|
((and (eq 'rectangle (car-safe rol))
|
|
(eq (nth 1 rol) (buffer-chars-modified-tick))
|
|
(eq start (nth 2 rol))
|
|
(eq end (nth 3 rol)))
|
|
rol)
|
|
(t
|
|
(save-excursion
|
|
(let* ((nrol nil)
|
|
(old (if (eq 'rectangle (car-safe rol))
|
|
(nthcdr 4 rol)
|
|
(funcall redisplay-unhighlight-region-function rol)
|
|
nil))
|
|
(ptcol (progn (goto-char start) (current-column)))
|
|
(markcol (progn (goto-char end) (current-column)))
|
|
(leftcol (min ptcol markcol))
|
|
(rightcol (max ptcol markcol)))
|
|
(goto-char start)
|
|
(while
|
|
(let* ((mleft (move-to-column leftcol))
|
|
(left (point))
|
|
(mright (move-to-column rightcol))
|
|
(right (point))
|
|
(ol
|
|
(if (not old)
|
|
(let ((ol (make-overlay left right)))
|
|
(overlay-put ol 'window window)
|
|
(overlay-put ol 'face 'region)
|
|
ol)
|
|
(let ((ol (pop old)))
|
|
(move-overlay ol left right (current-buffer))
|
|
ol))))
|
|
;; `move-to-column' may stop before the column (if bumping into
|
|
;; EOL) or overshoot it a little, when column is in the middle
|
|
;; of a char.
|
|
(cond
|
|
((< mleft leftcol) ;`leftcol' is past EOL.
|
|
(overlay-put ol 'before-string
|
|
(spaces-string (- leftcol mleft)))
|
|
(setq mright (max mright leftcol)))
|
|
((and (> mleft leftcol) ;`leftcol' is in the middle of a char.
|
|
(eq (char-before left) ?\t))
|
|
(setq left (1- left))
|
|
(move-overlay ol left right)
|
|
(goto-char left)
|
|
(overlay-put ol 'before-string
|
|
(spaces-string (- leftcol (current-column)))))
|
|
((overlay-get ol 'before-string)
|
|
(overlay-put ol 'before-string nil)))
|
|
(cond
|
|
((< mright rightcol) ;`rightcol' is past EOL.
|
|
(let ((str (make-string (- rightcol mright) ?\s)))
|
|
(put-text-property 0 (length str) 'face 'region str)
|
|
;; If cursor happens to be here, draw it *before* rather than
|
|
;; after this highlighted pseudo-text.
|
|
(put-text-property 0 1 'cursor t str)
|
|
(overlay-put ol 'after-string str)))
|
|
((and (> mright rightcol) ;`rightcol's in the middle of a char.
|
|
(eq (char-before right) ?\t))
|
|
(setq right (1- right))
|
|
(move-overlay ol left right)
|
|
(if (= rightcol leftcol)
|
|
(overlay-put ol 'after-string nil)
|
|
(goto-char right)
|
|
(let ((str (make-string
|
|
(- rightcol (max leftcol (current-column)))
|
|
?\s)))
|
|
(put-text-property 0 (length str) 'face 'region str)
|
|
(when (= left right)
|
|
;; If cursor happens to be here, draw it *before* rather
|
|
;; than after this highlighted pseudo-text.
|
|
(put-text-property 0 1 'cursor 1 str))
|
|
(overlay-put ol 'after-string str))))
|
|
((overlay-get ol 'after-string)
|
|
(overlay-put ol 'after-string nil)))
|
|
(when (and (= leftcol rightcol) (display-graphic-p))
|
|
;; Make zero-width rectangles visible!
|
|
(overlay-put ol 'after-string
|
|
(concat (propertize " "
|
|
'face '(region (:height 0.2)))
|
|
(overlay-get ol 'after-string))))
|
|
(push ol nrol)
|
|
(and (zerop (forward-line 1))
|
|
(<= (point) end))))
|
|
(mapc #'delete-overlay old)
|
|
`(rectangle ,(buffer-chars-modified-tick) ,start ,end ,@nrol))))))
|
|
|
|
(defun rectangle--unhighlight-for-redisplay (orig rol)
|
|
(if (not (eq 'rectangle (car-safe rol)))
|
|
(funcall orig rol)
|
|
(mapc #'delete-overlay (nthcdr 4 rol))
|
|
(setcar (cdr rol) nil)))
|
|
|
|
(provide 'rect)
|
|
|
|
;;; rect.el ends here
|