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428
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1 ;;; register.el --- register commands for Emacs.
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2
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3 ;; Copyright (C) 1985, 1993, 1994, 1997 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: internal, dumped
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 20.3
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26
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27 ;;; Commentary:
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28
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29 ;; This file is dumped with XEmacs.
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30
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31 ;; This package of functions emulates and somewhat extends the venerable
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32 ;; TECO's `register' feature, which permits you to save various useful
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33 ;; pieces of buffer state to named variables. The entry points are
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34 ;; documented in the Emacs user's manual.
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35
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36 ;;; Code:
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37
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38 (defvar register-alist nil
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39 "Alist of elements (NAME . CONTENTS), one for each Emacs register.
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40 NAME is a character (a number). CONTENTS is a string, number, marker or list.
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41 A list of strings represents a rectangle.
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42 A list of the form (file . NAME) represents the file named NAME.
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43 A list of the form (file-query NAME POSITION) represents position POSITION
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44 in the file named NAME, but query before visiting it.
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45 A list of the form (WINDOW-CONFIGURATION POSITION)
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46 represents a saved window configuration plus a saved value of point.
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47 A list of the form (FRAME-CONFIGURATION POSITION)
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48 represents a saved frame configuration plus a saved value of point.")
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49
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50 (defun get-register (reg)
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51 "Return contents of Emacs register named REG, or nil if none."
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52 (cdr (assq reg register-alist)))
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53
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54 (defun set-register (register value)
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55 "Set contents of Emacs register named REGISTER to VALUE. Returns VALUE.
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56 See the documentation of the variable `register-alist' for possible VALUE."
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57 (let ((aelt (assq register register-alist)))
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58 (if aelt
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59 (setcdr aelt value)
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60 (setq aelt (cons register value))
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61 (setq register-alist (cons aelt register-alist)))
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62 value))
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63
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64 (defun point-to-register (register &optional arg)
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65 "Store current location of point in register REGISTER.
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66 With prefix argument, store current frame configuration.
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67 Use \\[jump-to-register] to go to that location or restore that configuration.
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68 Argument is a character, naming the register."
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69 (interactive "cPoint to register: \nP")
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70 (set-register register
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71 (if arg (list (current-frame-configuration) (point-marker))
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72 (point-marker))))
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73
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74 (defun window-configuration-to-register (register &optional arg)
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75 "Store the window configuration of the selected frame in register REGISTER.
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76 Use \\[jump-to-register] to restore the configuration.
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77 Argument is a character, naming the register."
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78 (interactive "cWindow configuration to register: \nP")
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79 ;; current-window-configuration does not include the value
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80 ;; of point in the current buffer, so record that separately.
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81 (set-register register (list (current-window-configuration) (point-marker))))
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82
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83 (defun frame-configuration-to-register (register &optional arg)
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84 "Store the window configuration of all frames in register REGISTER.
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85 Use \\[jump-to-register] to restore the configuration.
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86 Argument is a character, naming the register."
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87 (interactive "cFrame configuration to register: \nP")
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88 ;; current-frame-configuration does not include the value
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89 ;; of point in the current buffer, so record that separately.
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90 (set-register register (list (current-frame-configuration) (point-marker))))
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91
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92 (defalias 'register-to-point 'jump-to-register)
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93 (defun jump-to-register (register &optional delete)
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94 "Move point to location stored in a register.
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95 If the register contains a file name, find that file.
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96 \(To put a file name in a register, you must use `set-register'.)
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97 If the register contains a window configuration (one frame) or a frame
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98 configuration (all frames), restore that frame or all frames accordingly.
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99 First argument is a character, naming the register.
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100 Optional second arg non-nil (interactively, prefix argument) says to
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101 delete any existing frames that the frame configuration doesn't mention.
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102 \(Otherwise, these frames are iconified.)"
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103 (interactive "cJump to register: \nP")
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104 (let ((val (get-register register)))
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105 (cond
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106 ((and (consp val) (frame-configuration-p (car val)))
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107 (set-frame-configuration (car val) (not delete))
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108 (goto-char (cadr val)))
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109 ((and (consp val) (window-configuration-p (car val)))
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110 (set-window-configuration (car val))
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111 (goto-char (cadr val)))
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112 ((markerp val)
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113 (or (marker-buffer val)
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114 (error "That register's buffer no longer exists"))
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115 (switch-to-buffer (marker-buffer val))
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116 (goto-char val))
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117 ((and (consp val) (eq (car val) 'file))
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118 (find-file (cdr val)))
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119 ((and (consp val) (eq (car val) 'file-query))
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120 (or (find-buffer-visiting (nth 1 val))
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121 (y-or-n-p (format "Visit file %s again? " (nth 1 val)))
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122 (error "Register access aborted"))
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123 (find-file (nth 1 val))
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124 (goto-char (nth 2 val)))
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125 (t
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126 (error "Register doesn't contain a buffer position or configuration")))))
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127
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128 ;; Turn markers into file-query references when a buffer is killed.
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129 (defun register-swap-out ()
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130 (and buffer-file-name
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131 (let ((tail register-alist))
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132 (while tail
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133 (and (markerp (cdr (car tail)))
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134 (eq (marker-buffer (cdr (car tail))) (current-buffer))
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135 (setcdr (car tail)
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136 (list 'file-query
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137 buffer-file-name
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138 (marker-position (cdr (car tail))))))
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139 (setq tail (cdr tail))))))
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140
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141 (add-hook 'kill-buffer-hook 'register-swap-out)
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142
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143 (defun number-to-register (number register)
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144 "Store a number in a register.
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145 Two args, NUMBER and REGISTER (a character, naming the register).
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146 If NUMBER is nil, a decimal number is read from the buffer starting
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147 at point, and point moves to the end of that number.
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148 Interactively, NUMBER is the prefix arg (none means nil)."
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149 (interactive "P\ncNumber to register: ")
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150 (set-register register
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151 (if number
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152 (prefix-numeric-value number)
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153 (if (looking-at "\\s-*-?[0-9]+")
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154 (progn
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155 (goto-char (match-end 0))
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156 (string-to-int (match-string 0)))
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157 0))))
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158
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159 (defun increment-register (number register)
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160 "Add NUMBER to the contents of register REGISTER.
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161 Interactively, NUMBER is the prefix arg."
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162 (interactive "p\ncIncrement register: ")
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163 (or (numberp (get-register register))
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164 (error "Register does not contain a number"))
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165 (set-register register (+ number (get-register register))))
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166
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167 (defun view-register (register)
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168 "Display what is contained in register named REGISTER.
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169 The Lisp value REGISTER is a character."
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170 (interactive "cView register: ")
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171 (let ((val (get-register register)))
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172 (if (null val)
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173 (message "Register %s is empty" (single-key-description register))
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174 (with-output-to-temp-buffer "*Output*"
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175 (princ "Register ")
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176 (princ (single-key-description register))
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177 (princ " contains ")
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178 (cond
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179 ((numberp val)
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180 (princ val))
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181
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182 ((markerp val)
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183 (let ((buf (marker-buffer val)))
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184 (if (null buf)
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185 (princ "a marker in no buffer")
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186 (princ "a buffer position:\nbuffer ")
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187 (princ (buffer-name buf))
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188 (princ ", position ")
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189 (princ (marker-position val)))))
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190
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191 ((and (consp val) (window-configuration-p (car val)))
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192 (princ "a window configuration."))
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193
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194 ((and (consp val) (frame-configuration-p (car val)))
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195 (princ "a frame configuration."))
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196
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197 ((and (consp val) (eq (car val) 'file))
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198 (princ "the file ")
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199 (prin1 (cdr val))
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200 (princ "."))
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201
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202 ((and (consp val) (eq (car val) 'file-query))
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203 (princ "a file-query reference:\nfile ")
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204 (prin1 (car (cdr val)))
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205 (princ ",\nposition ")
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206 (princ (car (cdr (cdr val))))
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207 (princ "."))
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208
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209 ((consp val)
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210 (princ "the rectangle:\n")
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211 (while val
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212 (princ (car val))
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213 (terpri)
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214 (setq val (cdr val))))
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215
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216 ((stringp val)
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217 (princ "the text:\n")
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218 (princ val))
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219
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220 (t
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221 (princ "Garbage:\n")
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222 (prin1 val)))))))
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223
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224 (defun insert-register (register &optional arg)
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225 "Insert contents of register REGISTER. (REGISTER is a character.)
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226 Normally puts point before and mark after the inserted text.
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227 If optional second arg is non-nil, puts mark before and point after.
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228 Interactively, second arg is non-nil if prefix arg is supplied."
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229 (interactive "*cInsert register: \nP")
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230 (push-mark)
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231 (let ((val (get-register register)))
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232 (cond
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233 ((consp val)
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234 (insert-rectangle val))
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235 ((stringp val)
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236 (insert val))
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237 ((numberp val)
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238 (princ val (current-buffer)))
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239 ((and (markerp val) (marker-position val))
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240 (princ (marker-position val) (current-buffer)))
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241 (t
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242 (error "Register does not contain text"))))
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243 ;; XEmacs: don't activate the region. It's annoying.
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244 (if (not arg) (exchange-point-and-mark t)))
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245
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246 (defun copy-to-register (register start end &optional delete-flag)
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247 "Copy region into register REGISTER. With prefix arg, delete as well.
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248 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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249 START and END are buffer positions indicating what to copy."
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250 (interactive "cCopy to register: \nr\nP")
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251 (set-register register (buffer-substring start end))
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252 (if delete-flag (delete-region start end)))
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253
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254 (defun append-to-register (register start end &optional delete-flag)
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255 "Append region to text in register REGISTER.
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256 With prefix arg, delete as well.
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257 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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258 START and END are buffer positions indicating what to append."
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259 (interactive "cAppend to register: \nr\nP")
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260 (or (stringp (get-register register))
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261 (error "Register does not contain text"))
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262 (set-register register (concat (get-register register)
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263 (buffer-substring start end)))
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264 (if delete-flag (delete-region start end)))
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265
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266 (defun prepend-to-register (register start end &optional delete-flag)
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267 "Prepend region to text in register REGISTER.
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268 With prefix arg, delete as well.
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269 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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270 START and END are buffer positions indicating what to prepend."
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271 (interactive "cPrepend to register: \nr\nP")
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272 (or (stringp (get-register register))
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273 (error "Register does not contain text"))
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274 (set-register register (concat (buffer-substring start end)
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275 (get-register register)))
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276 (if delete-flag (delete-region start end)))
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277
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278 (defun copy-rectangle-to-register (register start end &optional delete-flag)
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279 "Copy rectangular region into register REGISTER.
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280 With prefix arg, delete as well.
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281 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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282 START and END are buffer positions giving two corners of rectangle."
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283 (interactive "cCopy rectangle to register: \nr\nP")
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284 (set-register register
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285 (if delete-flag
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286 (delete-extract-rectangle start end)
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287 (extract-rectangle start end))))
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288
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289 ;;; register.el ends here
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