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1 ;;; register.el --- register commands for XEmacs.
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2
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3 ;; Copyright (C) 1985, 1993, 1994 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: internal
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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 19.34.
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26
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27 ;;; Commentary:
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28
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29 ;; This package of functions emulates and somewhat extends the venerable
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30 ;; TECO's `register' feature, which permits you to save various useful
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31 ;; pieces of buffer state to named variables. The entry points are
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32 ;; documented in the XEmacs Reference Manual.
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33
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34 ;;; Code:
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35
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36 (defvar register-alist nil
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37 "Alist of elements (NAME . CONTENTS), one for each Emacs register.
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38 NAME is a character (a number). CONTENTS is a string, number,
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39 frame configuration, mark or list.
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40 A list of strings represents a rectangle.
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41 A list of the form (file . NAME) represents the file named NAME.")
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42
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43 (defun get-register (reg)
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44 "Return contents of Emacs register named REG, or nil if none."
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45 (cdr (assq reg register-alist)))
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46
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47 (defun set-register (register value)
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48 "Set contents of Emacs register named REGISTER to VALUE. Returns VALUE.
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49 See the documentation of the variable `register-alist' for possible VALUEs."
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50 (let ((aelt (assq register register-alist)))
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51 (if aelt
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52 (setcdr aelt value)
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53 (setq aelt (cons register value))
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54 (setq register-alist (cons aelt register-alist)))
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55 value))
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56
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57 (defun point-to-register (register &optional arg)
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58 "Store current location of point in register REGISTER.
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59 With prefix argument, store current frame configuration.
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60 Use \\[jump-to-register] to go to that location or restore that configuration.
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61 Argument is a character, naming the register."
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62 (interactive "cPoint to register: \nP")
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63 (set-register register
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64 (if arg (current-frame-configuration) (point-marker))))
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65
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66 (defun window-configuration-to-register (register &optional arg)
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67 "Store the window configuration of the selected frame in register REGISTER.
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68 Use \\[jump-to-register] to restore the configuration.
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69 Argument is a character, naming the register."
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70 (interactive "cWindow configuration to register: \nP")
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71 (set-register register (current-window-configuration)))
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72
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73 (defun frame-configuration-to-register (register &optional arg)
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74 "Store the window configuration of all frames in register REGISTER.
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75 Use \\[jump-to-register] to restore the configuration.
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76 Argument is a character, naming the register."
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77 (interactive "cFrame configuration to register: \nP")
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78 (set-register register (current-frame-configuration)))
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79
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80 (defalias 'register-to-point 'jump-to-register)
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81 (defun jump-to-register (register &optional delete)
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82 "Move point to location stored in a register.
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83 If the register contains a file name, find that file.
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84 \(To put a file name in a register, you must use `set-register'.)
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85 If the register contains a window configuration (one frame) or a frame
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86 configuration (all frames), restore that frame or all frames accordingly.
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87 First argument is a character, naming the register.
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88 Optional second arg non-nil (interactively, prefix argument) says to
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89 delete any existing frames that the frame configuration doesn't mention.
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90 \(Otherwise, these frames are iconified.)"
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91 (interactive "cJump to register: \nP")
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92 (let ((val (get-register register)))
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93 (cond
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94 ((and (fboundp 'frame-configuration-p)
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95 (frame-configuration-p val))
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96 (set-frame-configuration val (not delete)))
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97 ((window-configuration-p val)
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98 (set-window-configuration val))
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99 ((markerp val)
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100 (or (marker-buffer val)
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101 (error "That register's buffer no longer exists"))
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102 (switch-to-buffer (marker-buffer val))
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103 (goto-char val))
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104 ((and (consp val) (eq (car val) 'file))
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105 (find-file (cdr val)))
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106 (t
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107 (error "Register doesn't contain a buffer position or configuration")))))
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108
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109 ;(defun number-to-register (arg char)
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110 ; "Store a number in a register.
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111 ;Two args, NUMBER and REGISTER (a character, naming the register).
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112 ;If NUMBER is nil, digits in the buffer following point are read
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113 ;to get the number to store.
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114 ;Interactively, NUMBER is the prefix arg (none means nil)."
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115 ; (interactive "P\ncNumber to register: ")
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116 ; (set-register char
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117 ; (if arg
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118 ; (prefix-numeric-value arg)
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119 ; (if (looking-at "[0-9][0-9]*")
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120 ; (save-excursion
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121 ; (save-restriction
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122 ; (narrow-to-region (point)
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123 ; (progn (skip-chars-forward "0-9")
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124 ; (point)))
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125 ; (goto-char (point-min))
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126 ; (read (current-buffer))))
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127 ; 0))))
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128
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129 ;(defun increment-register (arg char)
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130 ; "Add NUMBER to the contents of register REGISTER.
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131 ;Interactively, NUMBER is the prefix arg (none means nil)."
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132 ; (interactive "p\ncNumber to register: ")
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133 ; (or (integerp (get-register char))
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134 ; (error "Register does not contain a number"))
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135 ; (set-register char (+ arg (get-register char))))
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136
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137 (defun view-register (register)
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138 "Display what is contained in register named REGISTER.
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139 The Lisp value REGISTER is a character."
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140 (interactive "cView register: ")
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141 (let ((val (get-register register)))
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142 (if (null val)
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143 (message "Register %s is empty" (single-key-description register))
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144 (with-output-to-temp-buffer "*Output*"
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145 (princ (format "Register %s contains "
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146 (single-key-description register)))
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147 (cond
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148 ((integerp val)
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149 (princ val))
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150
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151 ((markerp val)
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152 (let ((buf (marker-buffer val)))
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153 (if (null buf)
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154 (princ "a marker in no buffer")
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155 (princ (format
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156 "a buffer position:\nbuff %s, position %s"
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157 (buffer-name (marker-buffer val))
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158 (marker-position val))))))
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159
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160 ((window-configuration-p val)
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161 (princ "a window configuration."))
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162
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163
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164 ;; ((frame-configuration-p val)
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165 ;; (princ "a frame configuration."))
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166
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167 ((and (consp val) (eq (car val) 'file))
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168 (princ "the file ")
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169 (prin1 (cdr val))
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170 (princ "."))
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171
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172 ((consp val)
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173 (princ "the rectangle:\n")
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174 (while val
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175 (princ (car val))
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176 (terpri)
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177 (setq val (cdr val))))
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178
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179 ((stringp val)
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180 (princ "the text:\n")
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181 (princ val))
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182
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183 (t
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184 (princ "Garbage:\n")
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185 (prin1 val)))))))
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186
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187 (defun insert-register (register &optional arg)
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188 "Insert contents of register REGISTER. (REGISTER is a character).
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189 Normally puts point before and mark after the inserted text.
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190 If optional second arg is non-nil, puts mark before and point after.
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191 Interactively, second arg is non-nil if prefix arg is supplied."
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192 (interactive "*cInsert register: \nP")
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193 (push-mark)
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194 (let ((val (get-register register)))
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195 (cond
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196 ((consp val)
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197 (insert-rectangle val))
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198 ((stringp val)
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199 (insert val))
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200 ((integerp val)
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201 (princ val (current-buffer)))
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202 ((and (markerp val) (marker-position val))
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203 (princ (marker-position val) (current-buffer)))
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204 (t
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205 (error "Register does not contain text"))))
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206 ;; XEmacs: don't activate the region. It's annoying.
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207 (if (not arg) (exchange-point-and-mark t)))
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208
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209 (defun copy-to-register (register start end &optional delete-flag)
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210 "Copy region into register REGISTER. With prefix arg, delete as well.
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211 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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212 START and END are buffer positions indicating what to copy."
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213 (interactive "cCopy to register: \nr\nP")
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214 (set-register register (buffer-substring start end))
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215 (if delete-flag (delete-region start end)))
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216
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217 (defun append-to-register (register start end &optional delete-flag)
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218 "Append region to text in register REGISTER.
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219 With prefix arg, delete as well.
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220 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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221 START and END are buffer positions indicating what to append."
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222 (interactive "cAppend to register: \nr\nP")
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223 (or (stringp (get-register register))
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224 (error "Register does not contain text"))
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225 (set-register register (concat (get-register register)
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226 (buffer-substring start end)))
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227 (if delete-flag (delete-region start end)))
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228
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229 (defun prepend-to-register (register start end &optional delete-flag)
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230 "Prepend region to text in register REGISTER.
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231 With prefix arg, delete as well.
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232 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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233 START and END are buffer positions indicating what to prepend."
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234 (interactive "cPrepend to register: \nr\nP")
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235 (or (stringp (get-register register))
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236 (error "Register does not contain text"))
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237 (set-register register (concat (buffer-substring start end)
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238 (get-register register)))
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239 (if delete-flag (delete-region start end)))
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240
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241 (defun copy-rectangle-to-register (register start end &optional delete-flag)
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242 "Copy rectangular region into register REGISTER.
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243 With prefix arg, delete as well.
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244 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
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245 START and END are buffer positions giving two corners of rectangle."
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246 (interactive "cCopy rectangle to register: \nr\nP")
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247 (set-register register
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248 (if delete-flag
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249 (delete-extract-rectangle start end)
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250 (extract-rectangle start end))))
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251
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252 ;;; register.el ends here
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