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1 ;;; mule-files.el --- File I/O functions for XEmacs/Mule.
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2
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3 ;; Copyright (C) 1992,93,94,95 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Amdahl Corporation.
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5 ;; Copyright (C) 1995 Sun Microsystems.
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Commentary:
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25
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26 ;;; Derived from mule.el in the original Mule but heavily modified
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27 ;;; by Ben Wing.
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28
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29 ;;; Code:
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30
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31 ;;;; #### also think more about `binary' vs. `no-conversion'
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32
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33 (setq-default file-coding-system 'iso-2022-8)
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34 (put 'file-coding-system 'permanent-local t)
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35
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36 (defvar overriding-file-coding-system nil
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37 "Overriding coding system used when reading a file.
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38 You should *bind* this, not set it. If this is non-nil, it specifies
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39 the coding system that will be used when a file is read in, and
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40 overrides `file-coding-system-for-read', `file-coding-system-alist',
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41 etc. Use those variables instead of this one for permanent changes
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42 to the environment.")
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43
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44 (defvar file-coding-system-for-read 'autodetect
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45 "Coding system used when reading a file.
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46 This provides coarse-grained control; for finer-grained control,
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47 use `file-coding-system-alist'. From a Lisp program, if you wish
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48 to unilaterally specify the coding system used for one
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49 particular operation, you should bind the variable
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50 `overriding-file-coding-system' rather than setting this variable,
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51 which is intended to be used for global environment specification.")
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52
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53 (defvar file-coding-system-alist
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54 '(("\\.el$" . iso-2022-7) ;; '(; ("\\.el$" . euc-japan)
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55 ("/spool/mail/.*$" . convert-mbox-coding-system))
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56 "Alist specifying the coding system used for particular files.
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57 Each element of the alist is a cons of a regexp, specifying the files
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58 to be affected, and a coding system. This overrides the more
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59 general specification in `file-coding-system-for-read', but is
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60 overridden by `overriding-file-coding-system'.
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61
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62 Instead of a coding system you may specify a function, and it will be
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63 called after the file has been read in to decode the file. It is
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64 called with four arguments: FILENAME, VISIT, START, and END, the same
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65 as the first four arguments to `insert-file-contents'.")
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66
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67 (defun set-file-coding-system (coding-system &optional force)
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68 "Set the current `file-coding-system' to CODING-SYSTEM.
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69 If optional argument FORCE (interactively, the prefix argument) is not
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70 given, attempt to match the EOL type of the new coding system to
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71 the current value of `file-coding-system'."
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72 (interactive "zFile coding system: \nP")
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73 (get-coding-system coding-system) ;; correctness check
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74 (if (not force)
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75 (setq coding-system
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76 (subsidiary-coding-system coding-system (coding-system-eol-type
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77 file-coding-system))))
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78 (setq file-coding-system coding-system)
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79 (redraw-modeline t))
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80
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81 (defun set-file-coding-system-for-read (coding-system)
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82 "Set the coding system used when reading in a file.
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83 This is equivalent to setting the variable `file-coding-system-for-read'.
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84 You can also use `file-coding-system-alist' to specify the coding system
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85 for particular files."
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86 (interactive "zFile coding system for read: ")
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87 (get-coding-system coding-system) ;; correctness check
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88 (setq file-coding-system-for-read coding-system))
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89
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90 (defun set-default-file-coding-system (coding-system)
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91 "Set the default value of `file-coding-system' to CODING-SYSTEM.
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92 The default value is used both for buffers without associated files
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93 and for files with no apparent coding system (i.e. primarily ASCII).
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94 See `file-coding-system' for more information."
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95 (interactive "zDefault file coding system: ")
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96 (setq-default file-coding-system coding-system)
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97 (redraw-modeline t))
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98
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99 (defun find-file-coding-system-from-filename (filename)
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100 "Look up a file in `file-coding-system-alist'.
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101 The return value will be nil (no applicable entry), a coding system object
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102 \(the entry specified a coding system), or something else (the entry
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103 specified a function to be called)."
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104 (let ((alist file-coding-system-alist)
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105 (found nil)
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106 (codesys nil))
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107 (let ((case-fold-search (eq system-type 'vax-vms)))
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108 (setq filename (file-name-sans-versions filename))
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109 (while (and (not found) alist)
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110 (if (string-match (car (car alist)) filename)
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111 (setq codesys (cdr (car alist))
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112 found t))
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113 (setq alist (cdr alist))))
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114 (if codesys
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115 (cond ((find-coding-system codesys))
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116 (t codesys)))))
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117
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118 (defun convert-mbox-coding-system (filename visit start end)
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119 "Decoding function for Unix mailboxes.
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120 Does separate detection and decoding on each message, since each
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121 message might be in a different encoding."
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122 (let ((buffer-read-only nil))
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123 (save-restriction
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124 (narrow-to-region start end)
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125 (goto-char (point-min))
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126 (while (not (eobp))
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127 (let ((start (point))
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128 end)
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129 (forward-char 1)
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130 (if (re-search-forward "^From" nil 'move)
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131 (beginning-of-line))
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132 (setq end (point))
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133 (decode-coding-region start end 'autodetect))))))
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134
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135 (defun find-coding-system-magic-cookie ()
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136 "Look for the coding-system magic cookie in the current buffer.\n"
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137 "The coding-system magic cookie is the exact string\n"
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138 "\";;;###coding system: \" followed by a valid coding system symbol,\n"
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139 "somewhere within the first 3000 characters of the file. If found,\n"
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140 "the coding system symbol is returned; otherwise nil is returned.\n"
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141 "Note that it is extremely unlikely that such a string would occur\n"
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142 "coincidentally as the result of encoding some characters in a non-ASCII\n"
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143 "charset, and that the spaces make it even less likely since the space\n"
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144 "character is not a valid octet in any ISO 2022 encoding of most non-ASCII\n"
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145 "charsets."
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146 (save-excursion
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147 (goto-char (point-min))
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148 (let ((case-fold-search nil))
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149 (if (search-forward ";;;###coding system: " (+ (point-min) 3000) t)
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150 (let ((start (point))
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151 (end (progn
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152 (skip-chars-forward "^ \t\n\r")
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153 (point))))
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154 (if (> end start)
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155 (let ((codesys (intern (buffer-substring start end))))
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156 (if (find-coding-system codesys) codesys))))))))
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157
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158 (defun load (file &optional noerror nomessage nosuffix)
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159 "Execute a file of Lisp code named FILE.
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160 First tries FILE with .elc appended, then tries with .el,
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161 then tries FILE unmodified. Searches directories in load-path.
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162 If optional second arg NOERROR is non-nil,
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163 report no error if FILE doesn't exist.
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164 Print messages at start and end of loading unless
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165 optional third arg NOMESSAGE is non-nil.
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166 If optional fourth arg NOSUFFIX is non-nil, don't try adding
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167 suffixes .elc or .el to the specified name FILE.
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168 Return t if file exists."
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169 (let* ((filename (substitute-in-file-name file))
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170 (handler (find-file-name-handler filename 'load))
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171 (path nil))
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172 (if handler
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173 (funcall handler 'load filename noerror nomessage nosuffix)
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174 (if (or (<= (length filename) 0)
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175 (null (setq path
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176 (locate-file filename load-path
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177 (and (not nosuffix) ".elc:.el:")))))
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178 (and (null noerror)
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179 (signal 'file-error (list "Cannot open load file" filename)))
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180 (let (__codesys__)
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181 (save-excursion
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182 (set-buffer (get-buffer-create " *load*"))
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183 (erase-buffer)
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184 (let ((file-coding-system-for-read 'no-conversion))
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185 (insert-file-contents path nil 1 3001))
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186 (setq __codesys__ (find-coding-system-magic-cookie)))
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187 ;; use string= instead of string-match to keep match-data.
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188 (if (string= ".elc" (downcase (substring path -4)))
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189 ;; if reading a byte-compiled file and we didn't find
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190 ;; a coding-system magic cookie, then use `binary'.
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191 ;; We need to guarantee that we never do autodetection
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192 ;; on byte-compiled files because confusion here would
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193 ;; be a very bad thing. Pre-existing byte-compiled
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194 ;; files are always in the `no-conversion' system.
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195 ;; Also, byte-compiled files always use `lf' to terminate
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196 ;; a line; don't risk confusion here either.
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197 (if (not __codesys__)
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198 (setq __codesys__ 'binary))
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199 ;; otherwise use `file-coding-system-for-read', as normal
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200 ;; #### need to do some looking up in file-coding-system-alist!
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201 (if (not __codesys__)
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202 (setq __codesys__ file-coding-system-for-read)))
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203 ;; now use the internal load to actually load the file.
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204 (load-internal file noerror nomessage nosuffix __codesys__))))))
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205
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206 (defvar insert-file-contents-access-hook nil
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207 "A hook to make a file accessible before reading it.
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208 `insert-file-contents' calls this hook before doing anything else.
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209 Called with two arguments: FILENAME and VISIT, the same as the
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210 corresponding arguments in the call to `insert-file-contents'.")
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211
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212 (defvar insert-file-contents-pre-hook nil
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213 "A special hook to decide the coding system used for reading in a file.
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214
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215 Before reading a file, `insert-file-contents' calls the functions
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216 on this hook with arguments FILENAME and VISIT, the same as the
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217 corresponding arguments in the call to `insert-file-contents'. In
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218 these functions, you may refer to the global variable
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219 `file-coding-system-for-read'.
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220
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221 The return value of the functions should be either
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222
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223 -- nil
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224 -- A coding system or a symbol denoting it, indicating the coding system
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225 to be used for reading the file
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226 -- A list of two elements (absolute pathname and length of data inserted),
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227 which is used as the return value to `insert-file-contents'. In this
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228 case, `insert-file-contents' assumes that the function has inserted
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229 the file for itself and suppresses further reading.
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230
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231 If any function returns non-nil, the remaining functions are not called.")
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232
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233 (defvar insert-file-contents-error-hook nil
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234 "A hook to set `file-coding-system' when a read error has occurred.
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235
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236 When a file error (e.g. nonexistent file) occurs while read a file,
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237 `insert-file-contents' calls the functions on this hook with three
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238 arguments: FILENAME and VISIT (the same as the corresponding arguments
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239 in the call to `insert-file-contents') and a cons (SIGNALED-CONDITIONS
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240 . SIGNAL-DATA).
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241
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242 After calling this hook, the error is signalled for real and
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243 propagates to the caller of `insert-file-contents'.")
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244
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245 (defvar insert-file-contents-post-hook nil
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246 "A hook to set `file-coding-system' for the current buffer.
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247
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248 After successful reading, `insert-file-contents' calls the functions
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249 on this hook with four arguments: FILENAME and VISIT (the same as the
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250 corresponding arguments in the call to `insert-file-contents'),
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251 CODING-SYSTEM (the actual coding system used to decode the file), and
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252 a cons of absolute pathname and length of data inserted (the same
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253 thing as will be returned from `insert-file-contents').")
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254
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255 (defun insert-file-contents (filename &optional visit beg end replace)
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256 "Insert contents of file FILENAME after point.
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257 Returns list of absolute file name and length of data inserted.
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258 If second argument VISIT is non-nil, the buffer's visited filename
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259 and last save file modtime are set, and it is marked unmodified.
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260 If visiting and the file does not exist, visiting is completed
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261 before the error is signaled.
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262
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263 The optional third and fourth arguments BEG and END
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264 specify what portion of the file to insert.
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265 If VISIT is non-nil, BEG and END must be nil.
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266 If optional fifth argument REPLACE is non-nil,
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267 it means replace the current buffer contents (in the accessible portion)
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268 with the file contents. This is better than simply deleting and inserting
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269 the whole thing because (1) it preserves some marker positions
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270 and (2) it puts less data in the undo list.
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271
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272 NOTE: When Mule support is enabled, the REPLACE argument is
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273 currently ignored.
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274
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275 The coding system used for decoding the file is determined as follows:
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276
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277 1. `overriding-file-coding-system', if non-nil.
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278 2. The result of `insert-file-contents-pre-hook', if non-nil.
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279 3. The matching value for this filename from `file-coding-system-alist',
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280 if any.
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281 4. `file-coding-system-for-read', if non-nil.
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282 5. The coding system 'no-conversion.
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283
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284 If a local value for `file-coding-system' in the current buffer does
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285 not exist, it is set to the coding system which was actually used for
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286 reading.
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287
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288 See also `insert-file-contents-access-hook', `insert-file-contents-pre-hook',
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289 `insert-file-contents-error-hook', and `insert-file-contents-post-hook'."
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290 (let (return-val coding-system used-codesys conversion-func)
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291 ;; OK, first load the file.
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292 (condition-case err
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293 (progn
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294 (run-hook-with-args 'insert-file-contents-access-hook
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295 filename visit)
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296 ;; determine the coding system to use, as described above.
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297 (setq coding-system
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298 (or
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299 ;; #1.
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300 overriding-file-coding-system
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301 ;; #2.
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302 (run-special-hook-with-args 'insert-file-contents-pre-hook
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303 filename visit)
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304 ;; #3.
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305 (let ((retval (find-file-coding-system-from-filename
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306 filename)))
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307 (if (or (null retval) (coding-system-p retval))
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308 retval
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309 (setq conversion-func retval)
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310 'no-conversion))
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311 ;; #4.
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312 file-coding-system-for-read
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313 ;; #5.
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314 'no-conversion))
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315 (if (consp coding-system)
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316 (setq return-val coding-system)
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317 (if (null (find-coding-system coding-system))
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318 (progn
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319 (message "Invalid coding-system (%s), using 'autodetect"
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320 coding-system)
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321 (setq coding-system 'autodetect)))
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322 (setq return-val
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323 (insert-file-contents-internal filename visit beg end
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324 replace coding-system
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325 ;; store here!
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326 'used-codesys))
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327 ))
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328 (file-error
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329 (run-hook-with-args 'insert-file-contents-error-hook
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330 filename visit err)
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331 (signal (car err) (cdr err))))
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332 (setq coding-system used-codesys)
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333 ;; call any `post-read-conversion' for the coding system that
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334 ;; was used ...
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335 (let ((func
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336 (coding-system-property coding-system 'post-read-conversion))
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337 (endmark (make-marker)))
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338 (set-marker endmark (+ (point) (nth 1 return-val)))
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339 (if func
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340 (unwind-protect
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341 (save-excursion
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342 (let (buffer-read-only)
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343 (funcall func (point) (marker-position endmark))))
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344 (if visit
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345 (progn
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346 (set-buffer-auto-saved)
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347 (set-buffer-modified-p nil)))))
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348 (setcar (cdr return-val) (- (marker-position endmark) (point)))
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349 ;; also call any post-conversion function called for by
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350 ;; `file-coding-system-alist'
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351 (if conversion-func
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352 (unwind-protect
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353 (save-excursion
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354 (let (buffer-read-only)
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355 (funcall conversion-func (point) (marker-position endmark))))
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356 (if visit
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357 (progn
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358 (set-buffer-auto-saved)
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359 (set-buffer-modified-p nil)))))
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360 (setcar (cdr return-val) (- (marker-position endmark) (point))))
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361 ;; now finally set the buffer's `file-coding-system'.
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362 (if (run-special-hook-with-args 'insert-file-contents-post-hook
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363 filename visit return-val)
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364 nil
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365 (if (local-variable-p 'file-coding-system (current-buffer))
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366 ;; if file-coding-system is already local, just
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367 ;; set its eol type to what was found, if it wasn't
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368 ;; set already.
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369 (set-file-coding-system
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370 (subsidiary-coding-system file-coding-system
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371 (coding-system-eol-type coding-system)))
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372 ;; otherwise actually set file-coding-system.
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373 (set-file-coding-system coding-system)))
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374 return-val))
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375
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376 (defvar write-region-pre-hook nil
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377 "A special hook to decide the coding system used for writing out a file.
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378
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379 Before writing a file, `write-region' calls the functions on this hook
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380 with arguments START, END, FILENAME, APPEND, VISIT, and CODING-SYTEM,
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381 the same as the corresponding arguments in the call to
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382 `write-region'.
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383
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384 The return value of the functions should be either
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385
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386 -- nil
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387 -- A coding system or a symbol denoting it, indicating the coding system
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388 to be used for reading the file
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389 -- A list of two elements (absolute pathname and length of data written),
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390 which is used as the return value to `write-region'. In this
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391 case, `write-region' assumes that the function has written
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392 the file for itself and suppresses further writing.
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393
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394 If any function returns non-nil, the remaining functions are not called.")
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395
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396 (defvar write-region-post-hook nil
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397 "A hook called by `write-region' after a file has been written out.
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398
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399 The functions on this hook are called with arguments START, END,
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400 FILENAME, APPEND, VISIT, and CODING-SYSTEM, the same as the
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401 corresponding arguments in the call to `write-region'.")
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402
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403 (defun write-region (start end filename &optional append visit lockname
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404 coding-system)
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405 "Write current region into specified file.
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406 When called from a program, takes three arguments:
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407 START, END and FILENAME. START and END are buffer positions.
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408 Optional fourth argument APPEND if non-nil means
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409 append to existing file contents (if any).
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410 Optional fifth argument VISIT if t means
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411 set last-save-file-modtime of buffer to this file's modtime
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412 and mark buffer not modified.
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413 If VISIT is a string, it is a second file name;
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414 the output goes to FILENAME, but the buffer is marked as visiting VISIT.
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415 VISIT is also the file name to lock and unlock for clash detection.
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416 If VISIT is neither t nor nil nor a string,
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417 that means do not print the \"Wrote file\" message.
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418 The optional sixth arg LOCKNAME, if non-nil, specifies the name to
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419 use for locking and unlocking, overriding FILENAME and VISIT.
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420 Kludgy feature: if START is a string, then that string is written
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421 to the file, instead of any buffer contents, and END is ignored.
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422 Optional seventh argument CODING-SYSTEM specifies the coding system
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423 used to encode the text when it is written out, and defaults to
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424 the value of `file-coding-system' in the current buffer.
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425 Interactively, with a prefix arg, you will be prompted for the
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426 coding system.
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427 See also `write-region-pre-hook' and `write-region-post-hook'."
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428 (interactive "r\nFWrite region to file: \ni\ni\ni\nZCoding-system: ")
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429 (setq coding-system
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430 (or (run-special-hook-with-args
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431 'write-region-pre-hook start end filename append visit lockname)
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432 coding-system
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433 file-coding-system))
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434 (if (consp coding-system)
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435 coding-system
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436 (let ((func
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437 (coding-system-property coding-system 'pre-write-conversion)))
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438 (if func
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439 (let ((curbuf (current-buffer))
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440 (tempbuf (generate-new-buffer " *temp-write-buffer*"))
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441 (modif (buffer-modified-p)))
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442 (unwind-protect
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443 (save-excursion
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444 (set-buffer tempbuf)
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445 (erase-buffer)
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446 (insert-buffer-substring curbuf start end)
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447 (funcall func (point-min) (point-max))
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448 (write-region-internal (point-min) (point-max) filename
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449 append
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450 (if (eq visit t) nil visit)
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451 lockname
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452 coding-system))
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453 ;; leaving a buffer associated with file will cause problems
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454 ;; when next visiting.
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455 (kill-buffer tempbuf)
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456 (if (or visit (null modif))
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457 (progn
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458 (set-buffer-auto-saved)
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459 (set-buffer-modified-p nil)
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460 (if (buffer-file-name) (set-visited-file-modtime))))))
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461 (write-region-internal start end filename append visit lockname
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462 coding-system)))
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463 (run-hook-with-args 'write-region-post-hook
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464 start end filename append visit lockname
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|
465 coding-system)))
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466
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467
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468
|
