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;;; register.el --- register commands for Emacs.
;; Copyright (C) 1985, 1993, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: internal
;; 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 2, 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.
;;; Commentary:
;; This package of functions emulates and somewhat extends the venerable
;; TECO's `register' feature, which permits you to save various useful
;; pieces of buffer state to named variables. The entry points are
;; documented in the Emacs user's manual.
;;; Code:
(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,
frame configuration, mark or list.
A list of strings represents a rectangle.
A list of the form (file . NAME) represents the file named NAME.")
(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. Returns VALUE.
See the documentation of the variable `register-alist' for possible VALUE."
(let ((aelt (assq char register-alist)))
(if aelt
(setcdr aelt value)
(setq aelt (cons char value))
(setq register-alist (cons aelt register-alist)))
value))
(defun point-to-register (char &optional arg)
"Store current location of point in register REGISTER.
With prefix argument, store current frame configuration.
Use \\[jump-to-register] to go to that location or restore that configuration.
Argument is a character, naming the register."
(interactive "cPoint to register: \nP")
(set-register char (if arg (current-frame-configuration) (point-marker))))
(defun window-configuration-to-register (char &optional arg)
"Store the window configuration of the selected frame in register REGISTER.
Use \\[jump-to-register] to restore the configuration.
Argument is a character, naming the register."
(interactive "cWindow configuration to register: \nP")
(set-register char (current-window-configuration)))
(defun frame-configuration-to-register (char &optional arg)
"Store the window configuration of all frames in register REGISTER.
Use \\[jump-to-register] to restore the configuration.
Argument is a character, naming the register."
(interactive "cFrame configuration to register: \nP")
(set-register char (current-frame-configuration)))
(defalias 'register-to-point 'jump-to-register)
(defun jump-to-register (char &optional delete)
"Move point to location stored in a register.
If the register contains a file name, find that file.
\(To put a file name in a register, you must use `set-register'.)
If the register contains a window configuration (one frame) or a frame
configuration (all frames), restore that frame or all frames accordingly.
First argument is a character, naming the register.
Optional second arg non-nil (interactively, prefix argument) says to
delete any existing frames that the frame configuration doesn't mention.
\(Otherwise, these frames are iconified.)"
(interactive "cJump to register: \nP")
(let ((val (get-register char)))
(cond
((and (fboundp 'frame-configuration-p)
(frame-configuration-p val))
(set-frame-configuration val (not delete)))
((window-configuration-p val)
(set-window-configuration val))
((markerp val)
(or (marker-buffer val)
(error "That register's buffer no longer exists"))
(switch-to-buffer (marker-buffer val))
(goto-char val))
((and (consp val) (eq (car val) 'file))
(find-file (cdr val)))
(t
(error "Register doesn't contain a buffer position or configuration")))))
;(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 ")
(cond
((integerp val)
(princ val))
((markerp val)
(let ((buf (marker-buffer val)))
(if (null buf)
(princ "a marker in no buffer")
(princ "a buffer position:\nbuffer ")
(princ (buffer-name buf))
(princ ", position ")
(princ (marker-position val)))))
((window-configuration-p val)
(princ "a window configuration."))
((frame-configuration-p val)
(princ "a frame configuration."))
((and (consp val) (eq (car val) 'file))
(princ "the file ")
(prin1 (cdr val))
(princ "."))
((consp val)
(princ "the rectangle:\n")
(while val
(princ (car val))
(terpri)
(setq val (cdr val))))
((stringp val)
(princ "the text:\n")
(princ val))
(t
(princ "Garbage:\n")
(prin1 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)))
(cond
((consp val)
(insert-rectangle val))
((stringp val)
(insert val))
((integerp val)
(princ val (current-buffer)))
((and (markerp val) (marker-position val))
(princ (marker-position val) (current-buffer)))
(t
(error "Register does not contain text"))))
(if (not 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))))
;;; register.el ends here
|
