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1 ;;; $Id: adapt.el,v 1.1.1.1 1996/12/18 22:43:20 steve Exp $
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2 ;;;
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3 ;;; Copyright (C) 1993, 1994, 1995 Heiko Muenkel
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4 ;;; email: muenkel@tnt.uni-hannover.de
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5 ;;;
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6 ;;; This program is free software; you can redistribute it and/or modify
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7 ;;; it under the terms of the GNU General Public License as published by
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8 ;;; the Free Software Foundation; either version 2, or (at your option)
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9 ;;; any later version.
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10 ;;;
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11 ;;; This program is distributed in the hope that it will be useful,
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12 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 ;;; GNU General Public License for more details.
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15 ;;;
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16 ;;; You should have received a copy of the GNU General Public License
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17 ;;; along with this program; if not, write to the Free Software
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18 ;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 ;;;
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20 ;;;
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21 ;;; Description:
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22 ;;;
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70
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23 ;;; General functions to port Lucid Emacs to GNU Emacs 19.
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24 ;;;
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25 ;;; Installation:
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26 ;;;
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27 ;;; Put this file in one of your lisp load directories.
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28 ;;;
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29
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30
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31 (defun adapt-xemacsp ()
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32 "Returns non nil if the editor is the XEmacs."
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33 (or (string-match "Lucid" emacs-version)
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34 (string-match "XEmacs" emacs-version)))
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35
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36
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37 (defun adapt-lemacsp ()
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38 "Returns non nil if the editor is the XEmacs.
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39 Old version, use `adapt-xemacsp' instead of this."
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40 (or (string-match "Lucid" emacs-version)
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41 (string-match "XEmacs" emacs-version)))
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42
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43
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44 (defun adapt-emacs19p ()
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45 "Returns non nil if the editor is the GNU Emacs 19."
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46 (and
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47 (not (adapt-xemacsp))
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48 (string= (substring emacs-version 0 2) "19")))
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49
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50 ;;; Functions, which doesn't exist in both emacses
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51
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52 (defun adapt-region-active-p ()
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53 "Returns t, if a region is active."
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54 (if (adapt-xemacsp)
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55 (mark)
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56 mark-active))
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57
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58
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59 (if (adapt-emacs19p)
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60 (progn
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61 (load-library "lucid")
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62
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63 (load-library "lmenu")
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64
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65 (if window-system
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66 (require 'font-lock)
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67 )
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68
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69 (make-face 'font-lock-comment-face)
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70
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71 (defun read-number (prompt &optional integers-only)
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72 "Reads a number from the minibuffer."
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73 (interactive)
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74 (let ((error t)
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75 (number nil))
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76 (if integers-only
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77 (while error
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78 (let ((input-string (read-string prompt)))
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79 (setq number (if (string= "" input-string)
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80 nil
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81 (read input-string)))
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82 (if (integerp number)
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83 (setq error nil))))
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84 (while error
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85 (let ((input-string (read-string prompt)))
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86 (setq number (if (string= "" input-string)
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87 nil
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88 (read input-string)))
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89 (if (numberp number)
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90 (setq error nil)))))
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91 number))
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92
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93 (defvar original-read-string-function nil
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94 "Points to the original Emacs 19 function read-string.")
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95
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96 (if (not original-read-string-function)
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97 (fset 'original-read-string-function
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98 (symbol-function 'read-string)))
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99
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100 (defun read-string (prompt &optional initial-contents history)
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101 "Return a string from the minibuffer, prompting with string PROMPT.
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102 If non-nil, optional second arg INITIAL-CONTENTS is a string to insert
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103 in the minibuffer before reading.
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104 Third arg HISTORY, if non-nil, specifies a history list."
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105 (read-from-minibuffer prompt initial-contents nil nil history))
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106
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107 (defun make-extent (beg end &optional buffer)
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108 (make-overlay beg end buffer))
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109
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110 (defun set-extent-property (extent prop value)
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111 (if (eq prop 'duplicable)
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112 (cond ((and value (not (overlay-get extent prop)))
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113 ;; If becoming duplicable,
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114 ;; copy all overlay props to text props.
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115 (add-text-properties (overlay-start extent)
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116 (overlay-end extent)
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117 (overlay-properties extent)
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118 (overlay-buffer extent)))
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119 ;; If becoming no longer duplicable, remove these text props.
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120 ((and (not value) (overlay-get extent prop))
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121 (remove-text-properties (overlay-start extent)
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122 (overlay-end extent)
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123 (overlay-properties extent)
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124 (overlay-buffer extent))))
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125 ;; If extent is already duplicable, put this property
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126 ;; on the text as well as on the overlay.
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127 (if (overlay-get extent 'duplicable)
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128 (put-text-property (overlay-start extent)
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129 (overlay-end extent)
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130 prop value (overlay-buffer extent))))
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131 (overlay-put extent prop value))
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132
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133 (defun set-extent-face (extent face)
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134 (set-extent-property extent 'face face))
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135
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136 (defun delete-extent (extent)
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137 (set-extent-property extent 'duplicable nil)
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138 (delete-overlay extent))
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139
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140 ; (defun make-extent (from to &optional buffer)
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141 ; "Make extent for range [FROM, TO) in BUFFER -- BUFFER defaults to
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142 ;current buffer. Insertions at point TO will be outside of the extent;
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143 ;insertions at FROM will be inside the extent (and the extent will grow.).
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144 ;This is only a simple emulation of the Lucid Emacs extents !"
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145 ; (list 'extent from to buffer))
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146 ;
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147 ; (defun set-extent-face (extent face)
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148 ; "Make the given EXTENT have the graphic attributes specified by FACE.
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149 ;This is only a simple emulation of the Lucid Emacs extents !"
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150 ; (put-text-property (car (cdr extent))
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151 ; (car (cdr (cdr extent)))
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152 ; 'face
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153 ; face
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154 ; (car (cdr (cdr (cdr extent))))))
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155 ;
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156 ; (defun delete-extent (extent_obj)
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157 ; "Remove EXTENT from its buffer; this does not modify the buffer's text,
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158 ;only its display properties.
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159 ;This is only a simple emulation of the Lucid Emacs extents !"
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160 ; (remove-text-properties (car (cdr extent_obj))
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161 ; (car (cdr (cdr extent_obj)))
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162 ; (list 'face nil)
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163 ; (car (cdr (cdr (cdr extent_obj))))))
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164 ;
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165
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166 (if (not (fboundp 'emacs-pid))
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167 (defun emacs-pid ()
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168 "Return the process ID of Emacs, as an integer.
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169 This is a dummy function for old versions of the Emacs 19.
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170 You should install a new version, which has `emacs-pid' implemented."
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171 0)
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172 )
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173
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174 (if (not (fboundp 'facep))
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175 (defun facep (object)
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176 "Whether OBJECT is a FACE.
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177 It's only a dummy function in the Emacs 19, which returns always nil."
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178 nil))
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179
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180 ; (if (not (fboundp 'set-extent-property))
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181 ; (defun set-extent-property (extent property value)
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182 ; "Change a property of an extent.
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183 ;Only a dummy version in Emacs 19."))
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184
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185 (if (not (fboundp 'region-active-p))
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186 (defun region-active-p ()
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187 "Non-nil iff the region is active.
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188 If `zmacs-regions' is true, this is equivalent to `region-exists-p'.
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189 Otherwise, this function always returns false."
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190 (adapt-region-active-p)))
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191
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192 (if (not (fboundp 'next-command-event))
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193 (defun next-command-event (&optional event prompt)
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194 "Unlike the XEmacs version it reads the next event, if
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195 it is a command event or not.
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196
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197 Return the next available \"user\" event.
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198 Pass this object to `dispatch-event' to handle it.
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199
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200 If EVENT is non-nil, it should be an event object and will be filled in
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201 and returned; otherwise a new event object will be created and returned.
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202 If PROMPT is non-nil, it should be a string and will be displayed in the
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203 echo area while this function is waiting for an event.
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204
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205 The event returned will be a keyboard, mouse press, or mouse release event.
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206 If there are non-command events available (mouse motion, sub-process output,
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207 etc) then these will be executed (with `dispatch-event') and discarded. This
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208 function is provided as a convenience; it is equivalent to the lisp code
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209
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210 (while (progn
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211 (next-event event prompt)
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212 (not (or (key-press-event-p event)
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213 (button-press-event-p event)
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214 (button-release-event-p event)
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215 (misc-user-event-p event))))
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216 (dispatch-event event))"
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217 (message prompt)
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218 (or event
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219 (read-event))))
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220
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221 (if (not (fboundp 'button-event-p))
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222 (defun button-event-p (obj)
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223 "True if OBJ is a button-press or button-release event object."
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224 (and (eventp obj)
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225 (or (eq 'mouse-1 (event-basic-type obj))
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226 (eq 'mouse-2 (event-basic-type obj))
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227 (eq 'mouse-3 (event-basic-type obj))))))
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228
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229 (if (not (fboundp 'button-press-event-p))
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230 (defun button-press-event-p (obj)
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231 "True if OBJ is a mouse-button-press event object."
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232 (and (button-event-p obj)
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233 (member 'down (event-modifiers obj)))))
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234
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235 (if (not (fboundp 'button-release-event-p))
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236 (defun button-release-event-p (obj)
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237 "True if OBJ is a mouse-button-release event object."
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238 (and (button-event-p obj)
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239 (not (button-press-event-p obj)))))
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240
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241 (if (not (fboundp 'event-window))
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242 (defun event-window (event)
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243 "Return the window of the given mouse event.
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244 This may be nil if the event occurred in the border or over a toolbar.
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245 The modeline is considered to be in the window it represents."
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246 (and (eventp event)
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247 (listp event)
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248 (listp (cdr event))
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249 (listp (car (cdr event)))
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250 (car (car (cdr event))))))
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251
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252 (if (not (fboundp 'event-buffer))
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253 (defun event-buffer (event)
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254 "Given a mouse-motion, button-press, or button-release event, return
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255 the buffer on which that event occurred. This will be nil for non-mouse
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256 events. If event-over-text-area-p is nil, this will also be nil."
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257 (if (button-event-p event)
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258 (window-buffer (event-window event)))))
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259
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260
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261 (if (not (fboundp 'event-closest-point))
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262 (defun event-closest-point (event)
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263 "Return the character position of the given mouse event.
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264 If the event did not occur over a window or over text, return the
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265 closest point to the location of the event. If the Y pixel position
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266 overlaps a window and the X pixel position is to the left of that
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267 window, the closest point is the beginning of the line containing the
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268 Y position. If the Y pixel position overlaps a window and the X pixel
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269 position is to the right of that window, the closest point is the end
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270 of the line containing the Y position. If the Y pixel position is
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271 above a window, return 0. If it is below a window, return the value
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272 of (window-end)."
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273 (posn-point (event-start event))))
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274
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275 (if (not (fboundp 'add-minor-mode))
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276 (defun add-minor-mode (toggle
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277 name
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278 &optional
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279 keymap
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280 after
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281 toggle-fun)
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282 "Add a minor mode to `minor-mode-alist' and `minor-mode-map-alist'.
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283 TOGGLE is a symbol whose value as a variable specifies whether the
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284 minor mode is active. NAME is the name that should appear in the
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285 modeline (it should be a string beginning with a space). KEYMAP is a
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286 keymap to make active when the minor mode is active. AFTER is the
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287 toggling symbol used for another minor mode. If AFTER is non-nil,
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288 then it is used to position the new mode in the minor-mode alists.
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289
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290 TOGGLE-FUN is only a dummy variable in the Emacs 19. In the XEmacs
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291 it has the following description:
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292 TOGGLE-FUN specifies an interactive function that is called to toggle
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293 the mode on and off; this affects what happens when button2 is pressed
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294 on the mode, and when button3 is pressed somewhere in the list of
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295 modes. If TOGGLE-FUN is nil and TOGGLE names an interactive function,
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296 TOGGLE is used as the toggle function.
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297
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298 Example: (add-minor-mode 'view-minor-mode \" View\" view-mode-map)
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299
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300 WARNING: THIS FUNCTION ISN'T READ YET."
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301 (if after
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302 (add-minor-mode-1 toggle name keymap after)
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303 (if (not (assq toggle minor-mode-alist))
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304 (progn
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305 (setq minor-mode-alist
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306 (cons (list toggle name)
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307 minor-mode-alist))))
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308 (if (not (assq toggle minor-mode-map-alist))
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309 (progn
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310 (setq minor-mode-map-alist
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311 (cons (cons toggle keymap)
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312 minor-mode-map-alist))))
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313 ))
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314 )
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315 ))
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316
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317
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318 (provide 'adapt)
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