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Richard M. Stallman
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efeae99398
179
lisp/register.el
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179
lisp/register.el
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;; Register commands for Emacs.
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;; Copyright (C) 1985 Free Software Foundation, Inc.
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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 1, 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
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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(defvar register-alist nil
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"Alist of elements (NAME . CONTENTS), one for each Emacs register.
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NAME is a character (a number). CONTENTS is a string, number,
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mark or list. A list represents a rectangle; its elements are strings.")
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(defun get-register (char)
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"Return contents of Emacs register named CHAR, or nil if none."
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(cdr (assq char register-alist)))
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(defun set-register (char value)
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"Set contents of Emacs register named CHAR to VALUE.
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Returns VALUE."
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(let ((aelt (assq char register-alist)))
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(if aelt
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(setcdr aelt value)
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(setq aelt (cons char value))
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(setq register-alist (cons aelt register-alist)))
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value))
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(defun point-to-register (char)
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"Store current location of point in a register.
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Argument is a character, naming the register."
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(interactive "cPoint to register: ")
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(set-register char (point-marker)))
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(fset 'register-to-point 'jump-to-register)
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(defun jump-to-register (char)
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"Move point to location stored in a register.
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Argument is a character, naming the register."
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(interactive "cJump to register: ")
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(let ((val (get-register char)))
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(if (markerp val)
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(progn
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(switch-to-buffer (marker-buffer val))
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(goto-char val))
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(error "Register doesn't contain a buffer position"))))
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;(defun number-to-register (arg char)
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; "Store a number in a register.
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;Two args, NUMBER and REGISTER (a character, naming the register).
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;If NUMBER is nil, digits in the buffer following point are read
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;to get the number to store.
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;Interactively, NUMBER is the prefix arg (none means nil)."
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; (interactive "P\ncNumber to register: ")
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; (set-register char
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; (if arg
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; (prefix-numeric-value arg)
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; (if (looking-at "[0-9][0-9]*")
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; (save-excursion
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; (save-restriction
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; (narrow-to-region (point)
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; (progn (skip-chars-forward "0-9")
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; (point)))
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; (goto-char (point-min))
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; (read (current-buffer))))
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; 0))))
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;(defun increment-register (arg char)
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; "Add NUMBER to the contents of register REGISTER.
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;Interactively, NUMBER is the prefix arg (none means nil)."
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; (interactive "p\ncNumber to register: ")
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; (or (integerp (get-register char))
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; (error "Register does not contain a number"))
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; (set-register char (+ arg (get-register char))))
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(defun view-register (char)
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"Display what is contained in register named REGISTER.
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REGISTER is a character."
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(interactive "cView register: ")
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(let ((val (get-register char)))
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(if (null val)
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(message "Register %s is empty" (single-key-description char))
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(with-output-to-temp-buffer "*Output*"
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(princ "Register ")
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(princ (single-key-description char))
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(princ " contains ")
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(if (integerp val)
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(princ val)
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(if (markerp val)
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(progn
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(princ "a buffer position:\nbuffer ")
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(princ (buffer-name (marker-buffer val)))
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(princ ", position ")
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(princ (+ 0 val)))
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(if (consp val)
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(progn
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(princ "the rectangle:\n")
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(setq val (cdr val))
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(while val
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(princ (car val))
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(terpri)
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(setq val (cdr val))))
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(princ "the string:\n")
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(princ val))))))))
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(defun insert-register (char &optional arg)
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"Insert contents of register REG. REG is a character.
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Normally puts point before and mark after the inserted text.
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If optional second arg is non-nil, puts mark before and point after.
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Interactively, second arg is non-nil if prefix arg is supplied."
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(interactive "cInsert register: \nP")
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(push-mark)
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(let ((val (get-register char)))
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(if (consp val)
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(insert-rectangle val)
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(if (stringp val)
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(insert val)
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(if (or (integerp val) (markerp val))
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(princ (+ 0 val) (current-buffer))
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(error "Register does not contain text")))))
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(if (not arg) (exchange-point-and-mark)))
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(defun copy-to-register (char start end &optional delete-flag)
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"Copy region into register REG.
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With prefix arg, delete as well.
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Called from program, takes four args:
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REG, START, END and DELETE-FLAG.
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START and END are buffer positions indicating what to copy."
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(interactive "cCopy to register: \nr\nP")
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(set-register char (buffer-substring start end))
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(if delete-flag (delete-region start end)))
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(defun append-to-register (char start end &optional delete-flag)
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"Append region to text in register REG.
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With prefix arg, delete as well.
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Called from program, takes four args:
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REG, START, END and DELETE-FLAG.
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START and END are buffer positions indicating what to append."
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(interactive "cAppend to register: \nr\nP")
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(or (stringp (get-register char))
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(error "Register does not contain text"))
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(set-register char (concat (get-register char)
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(buffer-substring start end)))
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(if delete-flag (delete-region start end)))
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(defun prepend-to-register (char start end &optional delete-flag)
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"Prepend region to text in register REG.
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With prefix arg, delete as well.
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Called from program, takes four args:
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REG, START, END and DELETE-FLAG.
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START and END are buffer positions indicating what to prepend."
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(interactive "cPrepend to register: \nr\nP")
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(or (stringp (get-register char))
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(error "Register does not contain text"))
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(set-register char (concat (buffer-substring start end)
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(get-register char)))
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(if delete-flag (delete-region start end)))
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(defun copy-rectangle-to-register (char start end &optional delete-flag)
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"Copy rectangular region into register REG.
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With prefix arg, delete as well.
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Called from program, takes four args:
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REG, START, END and DELETE-FLAG.
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START and END are buffer positions giving two corners of rectangle."
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(interactive "cCopy rectangle to register: \nr\nP")
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(set-register char
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(if delete-flag
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(delete-extract-rectangle start end)
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(extract-rectangle start end))))
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