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1 ;;; mule-sysdp.el --- consolidate MULE-version dependencies in one file.
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2
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3 ;; Copyright (C) 1996 William Perry
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4
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5 ;; Author: William Perry <wmperry@aventail.com>
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6 ;; Keywords: lisp, tools
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7
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8 ;; The purpose of this file is to eliminate the cruftiness that
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9 ;; would otherwise be required of packages that want to run on multiple
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10 ;; versions of Emacs with and without Mule support.
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11
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12 (require 'cl)
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13
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14 (defconst mule-sysdep-version (if (featurep 'mule)
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15 (cond
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16 ((string-match "XEmacs" emacs-version)
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17 'xemacs)
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18 ((and
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19 (boundp 'mule-version)
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20 (string-match "[0-9]+\\.[0-9]+"
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21 mule-version))
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22 (string-to-number (substring
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23 mule-version
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24 (match-beginning 0)
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25 (match-end 0))))
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26 (t 2.3))
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27 0)
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28 "What version of mule we are running under.")
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29
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30 (defconst mule-retrieval-coding-system
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31 (case mule-sysdep-version
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32 (2.3 *euc-japan*)
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33 (2.4 'coding-system-euc-japan)
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34 (xemacs 'euc-japan)
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35 (otherwise nil))
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36 "Default retrieval coding system for packages that use this package.")
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37
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38 (defconst mule-no-coding-system
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39 (case mule-sysdep-version
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40 (2.4 'no-conversion)
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41 (2.3 *noconv*)
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42 (xemacs 'no-conversion)
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43 (otherwise nil))
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44 "Coding system that means no coding system should be used.")
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45
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46 (defun mule-detect-coding-version (st nd)
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47 (case mule-sysdep-version
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48 (2.3 (code-detect-region (point-min) (point-max)))
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49 (2.4 (detect-coding-region (point-min) (point-max)))
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50 (xemacs (detect-coding-region (point-min) (point-max)))
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51 (otherwise nil)))
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52
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53 (defun mule-code-convert-region (st nd code)
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54 (case mule-sysdep-version
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55 (2.3
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56 (setq mc-flag t)
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57 (code-convert-region (point-min) (point-max) code *internal*)
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58 (set-file-coding-system code))
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59 (2.4
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60 (setq enable-multibyte-characters t)
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61 (if (eq code 'coding-system-automatic)
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62 nil
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63 (decode-coding-region st nd code)
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64 (set-buffer-file-coding-system code)))
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65 (xemacs
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66 (decode-coding-region (point-min) (point-max) code)
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67 (set-file-coding-system code))
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68 (otherwise
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69 nil)))
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70
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71 (defun mule-inhibit-code-conversion (proc)
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72 (if (process-buffer proc)
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73 (save-excursion
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74 (set-buffer (process-buffer proc))
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75 (set 'mc-flag nil)
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76 (set 'enable-multibyte-characters nil)))
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77 (case mule-sysdep-version
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78 ((2.4 2.3)
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79 (set-process-coding-system proc mule-no-coding-system
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80 mule-no-coding-system))
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81 (xemacs
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82 (set-process-input-coding-system proc mule-no-coding-system)
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83 (set-process-input-coding-system proc mule-no-coding-system))))
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84
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85 (defun mule-write-region-no-coding-system (st nd file)
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86 (let ((enable-multibyte-characters t)
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87 (coding-system-for-write 'no-conversion)
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88 (file-coding-system mule-no-coding-system)
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89 (buffer-file-coding-system mule-no-coding-system)
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90 (mc-flag t))
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91 (case mule-sysdep-version
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92 (2.3 (write-region st nd file nil nil nil *noconv*))
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93 (otherwise
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94 (write-region st nd file)))))
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95
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96 (defun mule-encode-string (str)
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97 (case mule-sysdep-version
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98 (2.3
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99 (code-convert-string str *internal* mule-retrieval-coding-system))
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100 ((2.4 xemacs)
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101 (encode-coding-string str mule-retrieval-coding-system))
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102 (otherwise
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103 str)))
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104
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105 (defun mule-decode-string (str)
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106 (and str
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107 (case mule-sysdep-version
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108 ((2.4 xemacs)
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109 (decode-coding-string str mule-retrieval-coding-system))
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110 (2.3
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111 (code-convert-string str *internal* mule-retrieval-coding-system))
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112 (otherwise
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113 str))))
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114
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115 (defun mule-truncate-string (str len &optional pad)
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116 "Truncate string STR so that string-width of STR is not greater than LEN.
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117 If width of the truncated string is less than LEN, and if a character PAD is
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118 defined, add padding end of it."
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119 (case mule-sysdep-version
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120 (2.4
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121 (let ((cl (string-to-vector str)) (n 0) (sw 0))
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122 (if (<= (string-width str) len) str
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123 (while (<= (setq sw (+ (char-width (aref cl n)) sw)) len)
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124 (setq n (1+ n)))
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125 (string-match (make-string n ?.) str)
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126 (setq str (substring str 0 (match-end 0))))
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127 (if pad (concat str (make-string (- len (string-width str)) pad)) str)))
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128 (2.3
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129 (let ((cl (string-to-char-list str)) (n 0) (sw 0))
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130 (if (<= (string-width str) len) str
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131 (while (<= (setq sw (+ (char-width (nth n cl)) sw)) len)
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132 (setq n (1+ n)))
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133 (string-match (make-string n ?.) str)
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134 (setq str (substring str 0 (match-end 0))))
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135 (if pad (concat str (make-string (- len (string-width str)) pad)) str)))
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136 (otherwise
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137 (concat (if (> (length str) len) (substring str 0 len) str)
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138 (if (or (null pad) (> (length str) len))
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139 ""
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140 (make-string (- len (length str)) pad))))))
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141
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142 (defun mule-make-iso-character (char)
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143 (if (<= char 127)
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144 char
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145 (case mule-sysdep-version
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146 (2.3 (make-character lc-ltn1 char))
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147 (2.4 (make-char charset-latin-iso8859-1 char))
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148 (xemacs char)
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149 (otherwise char))))
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150
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151 (case mule-sysdep-version
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152 ((2.3 2.4 xemacs) nil)
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153 (otherwise (fset 'string-width 'length)))
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154
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155 (and
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156 (boundp 'MULE)
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157 (not (featurep 'mule))
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158 (provide 'mule))
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159
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160 (provide 'mule-sysdp)
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