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1 ;;; emu.el --- Emulation module for each Emacs variants
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2
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3 ;; Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Version: $Id: emu.el,v 1.2 1997/06/29 23:12:06 steve Exp $
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155
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7 ;; Keywords: emulation, compatibility, NEmacs, MULE, Emacs/mule, XEmacs
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8
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9 ;; This file is part of emu.
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10
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11 ;; This program is free software; you can redistribute it and/or
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12 ;; modify it under the terms of the GNU General Public License as
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13 ;; published by the Free Software Foundation; either version 2, or (at
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14 ;; your option) any later version.
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15
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16 ;; This program is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Code:
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27
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28 (defmacro defun-maybe (name &rest everything-else)
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29 (or (and (fboundp name)
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30 (not (get name 'defun-maybe))
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31 )
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32 (` (or (fboundp (quote (, name)))
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33 (progn
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34 (defun (, name) (,@ everything-else))
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35 (put (quote (, name)) 'defun-maybe t)
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36 ))
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37 )))
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38
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39 (defmacro defmacro-maybe (name &rest everything-else)
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40 (or (and (fboundp name)
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41 (not (get name 'defmacro-maybe))
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42 )
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43 (` (or (fboundp (quote (, name)))
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44 (progn
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45 (defmacro (, name) (,@ everything-else))
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46 (put (quote (, name)) 'defmacro-maybe t)
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47 ))
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48 )))
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49
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50 (put 'defun-maybe 'lisp-indent-function 'defun)
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51 (put 'defmacro-maybe 'lisp-indent-function 'defun)
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52
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53
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54 (or (boundp 'emacs-major-version)
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55 (defconst emacs-major-version (string-to-int emacs-version)))
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56 (or (boundp 'emacs-minor-version)
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57 (defconst emacs-minor-version
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58 (string-to-int
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59 (substring
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60 emacs-version
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61 (string-match (format "%d\\." emacs-major-version) emacs-version)
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62 ))))
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63
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64 (defvar running-emacs-18 (<= emacs-major-version 18))
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65 (defvar running-xemacs (string-match "XEmacs" emacs-version))
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66
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67 (defvar running-mule-merged-emacs (and (not (boundp 'MULE))
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68 (not running-xemacs) (featurep 'mule)))
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69 (defvar running-xemacs-with-mule (and running-xemacs (featurep 'mule)))
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70
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71 (defvar running-emacs-19 (and (not running-xemacs) (= emacs-major-version 19)))
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72 (defvar running-emacs-19_29-or-later
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73 (or (and running-emacs-19 (>= emacs-minor-version 29))
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74 (and (not running-xemacs)(>= emacs-major-version 20))))
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75
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76 (defvar running-xemacs-19 (and running-xemacs
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77 (= emacs-major-version 19)))
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78 (defvar running-xemacs-20-or-later (and running-xemacs
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79 (>= emacs-major-version 20)))
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80 (defvar running-xemacs-19_14-or-later
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81 (or (and running-xemacs-19 (>= emacs-minor-version 14))
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82 running-xemacs-20-or-later))
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83
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84 (cond (running-mule-merged-emacs
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85 ;; for mule merged EMACS
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86 (require 'emu-e20)
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87 )
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88 (running-xemacs-with-mule
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89 ;; for XEmacs/mule
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90 (require 'emu-x20)
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91 )
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92 ((boundp 'MULE)
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93 ;; for MULE 1.* and 2.*
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94 (require 'emu-mule)
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95 )
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96 ((boundp 'NEMACS)
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97 ;; for NEmacs and NEpoch
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98 (require 'emu-nemacs)
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99 )
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100 (t
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101 ;; for EMACS 19 and XEmacs 19 (without mule)
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102 (require 'emu-e19)
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103 ))
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104
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105
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106 ;;; @ MIME charset
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107 ;;;
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108
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109 (defun charsets-to-mime-charset (charsets)
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110 "Return MIME charset from list of charset CHARSETS.
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111 This function refers variable `charsets-mime-charset-alist'
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112 and `default-mime-charset'. [emu.el]"
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113 (if charsets
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114 (or (catch 'tag
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115 (let ((rest charsets-mime-charset-alist)
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116 cell csl)
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117 (while (setq cell (car rest))
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118 (if (catch 'not-subset
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119 (let ((set1 charsets)
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120 (set2 (car cell))
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121 obj)
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122 (while set1
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123 (setq obj (car set1))
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124 (or (memq obj set2)
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125 (throw 'not-subset nil)
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126 )
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127 (setq set1 (cdr set1))
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128 )
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129 t))
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130 (throw 'tag (cdr cell))
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131 )
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132 (setq rest (cdr rest))
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133 )))
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134 default-mime-charset)))
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135
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136
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137 ;;; @ Emacs 19 emulation
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138 ;;;
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139
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140 (defun-maybe minibuffer-prompt-width ()
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141 "Return the display width of the minibuffer prompt."
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142 (save-excursion
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143 (set-buffer (window-buffer (minibuffer-window)))
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144 (current-column)
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145 ))
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146
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147
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148 ;;; @ Emacs 19.29 emulation
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149 ;;;
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150
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151 (defvar path-separator ":"
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152 "Character used to separate concatenated paths.")
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153
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154 (defun-maybe buffer-substring-no-properties (start end)
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155 "Return the characters of part of the buffer, without the text properties.
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156 The two arguments START and END are character positions;
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157 they can be in either order. [Emacs 19.29 emulating function]"
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158 (let ((string (buffer-substring start end)))
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159 (set-text-properties 0 (length string) nil string)
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160 string))
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161
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162 (defun-maybe match-string (num &optional string)
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163 "Return string of text matched by last search.
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164 NUM specifies which parenthesized expression in the last regexp.
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165 Value is nil if NUMth pair didn't match, or there were less than NUM pairs.
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166 Zero means the entire text matched by the whole regexp or whole string.
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167 STRING should be given if the last search was by `string-match' on STRING.
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168 \[Emacs 19.29 emulating function]"
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169 (if (match-beginning num)
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170 (if string
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171 (substring string (match-beginning num) (match-end num))
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172 (buffer-substring (match-beginning num) (match-end num)))))
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173
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174 (or running-emacs-19_29-or-later
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175 running-xemacs
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176 ;; for Emacs 19.28 or earlier
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177 (fboundp 'si:read-string)
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178 (progn
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179 (fset 'si:read-string (symbol-function 'read-string))
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180
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181 (defun read-string (prompt &optional initial-input history)
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182 "Read a string from the minibuffer, prompting with string PROMPT.
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183 If non-nil, second arg INITIAL-INPUT is a string to insert before reading.
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184 The third arg HISTORY, is dummy for compatibility. [emu.el]
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185 See `read-from-minibuffer' for details of HISTORY argument."
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186 (si:read-string prompt initial-input)
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187 )
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188 ))
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189
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190
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191 ;;; @ Emacs 19.30 emulation
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192 ;;;
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193
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194 ;; This function was imported Emacs 19.30.
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195 (defun-maybe add-to-list (list-var element)
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196 "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
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197 If you want to use `add-to-list' on a variable that is not defined
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198 until a certain package is loaded, you should put the call to `add-to-list'
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199 into a hook function that will be run only after loading the package.
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200 \[Emacs 19.30 emulating function]"
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201 (or (member element (symbol-value list-var))
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202 (set list-var (cons element (symbol-value list-var)))
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203 ))
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204
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205 (cond ((fboundp 'insert-file-contents-literally)
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206 )
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207 ((boundp 'file-name-handler-alist)
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208 (defun insert-file-contents-literally
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209 (filename &optional visit beg end replace)
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210 "Like `insert-file-contents', q.v., but only reads in the file.
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211 A buffer may be modified in several ways after reading into the buffer due
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212 to advanced Emacs features, such as file-name-handlers, format decoding,
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213 find-file-hooks, etc.
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214 This function ensures that none of these modifications will take place.
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215 \[Emacs 19.30 emulating function]"
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216 (let (file-name-handler-alist)
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217 (insert-file-contents filename visit beg end replace)
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218 ))
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219 )
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220 (t
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221 (defalias 'insert-file-contents-literally 'insert-file-contents)
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222 ))
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223
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224
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225 ;;; @ Emacs 19.31 emulation
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226 ;;;
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227
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228 (defun-maybe buffer-live-p (object)
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229 "Return non-nil if OBJECT is a buffer which has not been killed.
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230 Value is nil if OBJECT is not a buffer or if it has been killed.
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231 \[Emacs 19.31 emulating function]"
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232 (and object
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233 (get-buffer object)
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234 (buffer-name (get-buffer object))
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235 ))
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236
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237 ;; This macro was imported Emacs 19.33.
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238 (defmacro-maybe save-selected-window (&rest body)
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239 "Execute BODY, then select the window that was selected before BODY.
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240 \[Emacs 19.31 emulating function]"
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241 (list 'let
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242 '((save-selected-window-window (selected-window)))
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243 (list 'unwind-protect
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244 (cons 'progn body)
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245 (list 'select-window 'save-selected-window-window))))
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246
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247
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248 ;;; @ XEmacs emulation
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249 ;;;
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250
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251 (defun-maybe functionp (obj)
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252 "Returns t if OBJ is a function, nil otherwise.
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253 \[XEmacs emulating function]"
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254 (or (subrp obj)
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255 (byte-code-function-p obj)
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256 (and (symbolp obj)(fboundp obj))
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257 (and (consp obj)(eq (car obj) 'lambda))
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258 ))
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259
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260 (defun-maybe point-at-eol (&optional arg buffer)
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261 "Return the character position of the last character on the current line.
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262 With argument N not nil or 1, move forward N - 1 lines first.
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263 If scan reaches end of buffer, return that position.
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264 This function does not move point. [XEmacs emulating function]"
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265 (save-excursion
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266 (if buffer
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267 (set-buffer buffer)
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268 )
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269 (if arg
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270 (forward-line (1- arg))
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271 )
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272 (end-of-line)
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273 (point)
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274 ))
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275
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276
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277 ;;; @ for XEmacs 20
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278 ;;;
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279
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280 (or (fboundp 'char-int)
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281 (fset 'char-int (symbol-function 'identity))
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282 )
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283 (or (fboundp 'int-char)
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284 (fset 'int-char (symbol-function 'identity))
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285 )
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286 (or (fboundp 'char-or-char-int-p)
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287 (fset 'char-or-char-int-p (symbol-function 'integerp))
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288 )
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289
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290
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291 ;;; @ for text/richtext and text/enriched
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292 ;;;
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293
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167
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294 (cond ((fboundp 'richtext-decode)
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295 ;; have richtext.el
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296 )
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297 ((or running-emacs-19_29-or-later running-xemacs-19_14-or-later)
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155
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298 ;; have enriched.el
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299 (autoload 'richtext-decode "richtext")
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300 (or (assq 'text/richtext format-alist)
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301 (setq format-alist
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302 (cons
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303 (cons 'text/richtext
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304 '("Extended MIME text/richtext format."
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305 "Content-[Tt]ype:[ \t]*text/richtext"
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306 richtext-decode richtext-encode t enriched-mode))
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307 format-alist)))
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308 )
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309 (t
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310 ;; don't have enriched.el
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311 (autoload 'richtext-decode "tinyrich")
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312 (autoload 'enriched-decode "tinyrich")
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313 ))
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314
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315
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316 ;;; @ end
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317 ;;;
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318
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319 (provide 'emu)
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320
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321 ;;; emu.el ends here
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