4.4BSD/usr/src/contrib/emacs-18.57/lisp/register.el
;; Register commands for Emacs.
;; Copyright (C) 1985 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 1, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
(defvar register-alist nil
"Alist of elements (NAME . CONTENTS), one for each Emacs register.
NAME is a character (a number). CONTENTS is a string, number,
mark or list. A list represents a rectangle; its elements are strings.")
(defun get-register (char)
"Return contents of Emacs register named CHAR, or nil if none."
(cdr (assq char register-alist)))
(defun set-register (char value)
"Set contents of Emacs register named CHAR to VALUE."
(let ((aelt (assq char register-alist)))
(if aelt
(setcdr aelt value)
(setq aelt (cons char value))
(setq register-alist (cons aelt register-alist)))))
(defun point-to-register (char)
"Store current location of point in a register.
Argument is a character, naming the register."
(interactive "cPoint to register: ")
(set-register char (point-marker)))
(defun register-to-point (char)
"Move point to location stored in a register.
Argument is a character, naming the register."
(interactive "cRegister to point: ")
(let ((val (get-register char)))
(if (markerp val)
(progn
(switch-to-buffer (marker-buffer val))
(goto-char val))
(error "Register doesn't contain a buffer position"))))
;(defun number-to-register (arg char)
; "Store a number in a register.
;Two args, NUMBER and REGISTER (a character, naming the register).
;If NUMBER is nil, digits in the buffer following point are read
;to get the number to store.
;Interactively, NUMBER is the prefix arg (none means nil)."
; (interactive "P\ncNumber to register: ")
; (set-register char
; (if arg
; (prefix-numeric-value arg)
; (if (looking-at "[0-9][0-9]*")
; (save-excursion
; (save-restriction
; (narrow-to-region (point)
; (progn (skip-chars-forward "0-9")
; (point)))
; (goto-char (point-min))
; (read (current-buffer))))
; 0))))
;(defun increment-register (arg char)
; "Add NUMBER to the contents of register REGISTER.
;Interactively, NUMBER is the prefix arg (none means nil)."
; (interactive "p\ncNumber to register: ")
; (or (integerp (get-register char))
; (error "Register does not contain a number"))
; (set-register char (+ arg (get-register char))))
(defun view-register (char)
"Display what is contained in register named REGISTER.
REGISTER is a character."
(interactive "cView register: ")
(let ((val (get-register char)))
(if (null val)
(message "Register %s is empty" (single-key-description char))
(with-output-to-temp-buffer "*Output*"
(princ "Register ")
(princ (single-key-description char))
(princ " contains ")
(if (integerp val)
(princ val)
(if (markerp val)
(progn
(princ "a buffer position:\nbuffer ")
(princ (buffer-name (marker-buffer val)))
(princ ", position ")
(princ (+ 0 val)))
(if (consp val)
(progn
(princ "the rectangle:\n")
(while val
(princ (car val))
(terpri)
(setq val (cdr val))))
(princ "the string:\n")
(princ val))))))))
(defun insert-register (char &optional arg)
"Insert contents of register REG. REG is a character.
Normally puts point before and mark after the inserted text.
If optional second arg is non-nil, puts mark before and point after.
Interactively, second arg is non-nil if prefix arg is supplied."
(interactive "cInsert register: \nP")
(push-mark)
(let ((val (get-register char)))
(if (consp val)
(insert-rectangle val)
(if (stringp val)
(insert val)
(if (or (integerp val) (markerp val))
(princ (+ 0 val) (current-buffer))
(error "Register does not contain text")))))
(or arg (exchange-point-and-mark)))
(defun copy-to-register (char start end &optional delete-flag)
"Copy region into register REG.
With prefix arg, delete as well.
Called from program, takes four args:
REG, START, END and DELETE-FLAG.
START and END are buffer positions indicating what to copy."
(interactive "cCopy to register: \nr\nP")
(set-register char (buffer-substring start end))
(if delete-flag (delete-region start end)))
(defun append-to-register (char start end &optional delete-flag)
"Append region to text in register REG.
With prefix arg, delete as well.
Called from program, takes four args:
REG, START, END and DELETE-FLAG.
START and END are buffer positions indicating what to append."
(interactive "cAppend to register: \nr\nP")
(or (stringp (get-register char))
(error "Register does not contain text"))
(set-register char (concat (get-register char)
(buffer-substring start end)))
(if delete-flag (delete-region start end)))
(defun prepend-to-register (char start end &optional delete-flag)
"Prepend region to text in register REG.
With prefix arg, delete as well.
Called from program, takes four args:
REG, START, END and DELETE-FLAG.
START and END are buffer positions indicating what to prepend."
(interactive "cPrepend to register: \nr\nP")
(or (stringp (get-register char))
(error "Register does not contain text"))
(set-register char (concat (buffer-substring start end)
(get-register char)))
(if delete-flag (delete-region start end)))
(defun copy-rectangle-to-register (char start end &optional delete-flag)
"Copy rectangular region into register REG.
With prefix arg, delete as well.
Called from program, takes four args:
REG, START, END and DELETE-FLAG.
START and END are buffer positions giving two corners of rectangle."
(interactive "cCopy rectangle to register: \nr\nP")
(set-register char
(if delete-flag
(delete-extract-rectangle start end)
(extract-rectangle start end))))