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428
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1 ;;; code-files.el --- File I/O functions for XEmacs.
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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 ;;; Synched up with: Not synched.
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25
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26 ;;; Commentary:
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27
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28 ;; Derived from mule.el in the original Mule but heavily modified
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29 ;; by Ben Wing.
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30
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31 ;; 1997/3/11 modified by MORIOKA Tomohiko to sync with Emacs 20 API.
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32
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33 ;; This file was derived from the former mule-files.el which has been removed
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34 ;; as of XEmacs 21.2.15.
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35
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36 ;;; Code:
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37
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38 (setq-default buffer-file-coding-system 'raw-text)
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39 (put 'buffer-file-coding-system 'permanent-local t)
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40
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41 (define-obsolete-variable-alias
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42 'file-coding-system
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43 'buffer-file-coding-system)
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44
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45 (define-obsolete-variable-alias
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46 'overriding-file-coding-system
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47 'coding-system-for-read)
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48
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49 (defvar buffer-file-coding-system-for-read 'undecided
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50 "Coding system used when reading a file.
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51 This provides coarse-grained control; for finer-grained control, use
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52 `file-coding-system-alist'. From a Lisp program, if you wish to
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53 unilaterally specify the coding system used for one particular
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54 operation, you should bind the variable `coding-system-for-read'
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55 rather than setting this variable, which is intended to be used for
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56 global environment specification.")
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57
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58 (define-obsolete-variable-alias
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59 'file-coding-system-for-read
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60 'buffer-file-coding-system-for-read)
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61
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62 (defvar file-coding-system-alist
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63 `(
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64 ;; This must not be necessary, slb suggests -kkm
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65 ;; ("loaddefs.el$" . (binary . binary))
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66 ,@(mapcar
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67 #'(lambda (regexp) (cons regexp 'binary)) binary-file-regexps)
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68 ("TUTORIAL\\.\\(?:hr\\|pl\\|ro\\)\\'" . iso-8859-2)
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69 ;; ("\\.\\(el\\|emacs\\|info\\(-[0-9]+\\)?\\|texi\\)$" . iso-2022-8)
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70 ;; ("\\(ChangeLog\\|CHANGES-beta\\)$" . iso-2022-8)
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442
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71
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72 ;; This idea is totally broken, and the code didn't work anyway.
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73 ;; Mailboxes should be decoded by mail clients, who actually know
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74 ;; how to deal with them. Otherwise, their contents should be
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75 ;; treated as `binary'.
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76 ;("/spool/mail/.*$" . convert-mbox-coding-system)
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77 )
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428
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78 "Alist to decide a coding system to use for a file I/O operation.
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79 The format is ((PATTERN . VAL) ...),
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80 where PATTERN is a regular expression matching a file name,
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81 VAL is a coding system, a cons of coding systems, or a function symbol.
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82 If VAL is a coding system, it is used for both decoding and encoding
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83 the file contents.
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84 If VAL is a cons of coding systems, the car part is used for decoding,
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85 and the cdr part is used for encoding.
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86 If VAL is a function symbol, the function must return a coding system
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87 or a cons of coding systems which are used as above.
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88
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89 This overrides the more general specification in
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90 `buffer-file-coding-system-for-read', but is overridden by
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91 `coding-system-for-read'.")
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92
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93 (defun set-buffer-file-coding-system (coding-system &optional force)
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94 "Set buffer-file-coding-system of the current buffer to CODING-SYSTEM.
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95 If optional argument FORCE (interactively, the prefix argument) is not
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96 given, attempt to match the EOL type of the new coding system to
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97 the current value of `buffer-file-coding-system'."
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98 (interactive "zFile coding system: \nP")
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99 (get-coding-system coding-system) ;; correctness check
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100 (if (not force)
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101 (setq coding-system
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102 (subsidiary-coding-system
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103 coding-system
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104 (coding-system-eol-type buffer-file-coding-system))))
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105 (setq buffer-file-coding-system coding-system)
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106 (redraw-modeline t))
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107
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108 (defun toggle-buffer-file-coding-system ()
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109 "Set EOL type of buffer-file-coding-system of the current buffer to
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110 something other than what it is at the moment."
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111 (interactive)
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112 (let ((eol-type
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113 (coding-system-eol-type buffer-file-coding-system)))
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114 (setq buffer-file-coding-system
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115 (subsidiary-coding-system
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116 (coding-system-base buffer-file-coding-system)
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117 (cond ((eq eol-type 'lf) 'crlf)
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118 ((eq eol-type 'crlf) 'lf)
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119 ((eq eol-type 'cr) 'lf))))))
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120
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121 (define-obsolete-function-alias
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122 'set-file-coding-system
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123 'set-buffer-file-coding-system)
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124
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125 (defun set-buffer-file-coding-system-for-read (coding-system)
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126 "Set the coding system used when reading in a file.
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127 This is equivalent to setting the variable
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128 `buffer-file-coding-system-for-read'. You can also use
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129 `file-coding-system-alist' to specify the coding system for
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130 particular files."
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131 (interactive "zFile coding system for read: ")
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132 (get-coding-system coding-system) ;; correctness check
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133 (setq buffer-file-coding-system-for-read coding-system))
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134
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135 (define-obsolete-function-alias
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136 'set-file-coding-system-for-read
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137 'set-buffer-file-coding-system-for-read)
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138
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139 (defun set-default-buffer-file-coding-system (coding-system)
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140 "Set the default value of `buffer-file-coding-system' to CODING-SYSTEM.
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141 The default value is used both for buffers without associated files
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142 and for files with no apparent coding system (i.e. primarily ASCII).
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143 See `buffer-file-coding-system' for more information."
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144 (interactive "zDefault file coding system: ")
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145 (setq-default buffer-file-coding-system coding-system)
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146 (redraw-modeline t))
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147
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148 (define-obsolete-function-alias
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149 'set-default-file-coding-system
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150 'set-default-buffer-file-coding-system)
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151
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152 (defun find-file-coding-system-for-read-from-filename (filename)
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153 "Look up coding system to read a file in `file-coding-system-alist'.
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154 The return value will be nil (no applicable entry) or a coding system
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155 object (the entry specified a coding system)."
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156 (let ((alist file-coding-system-alist)
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157 (found nil)
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158 (codesys nil))
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159 (let ((case-fold-search nil))
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160 (setq filename (file-name-sans-versions filename))
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161 (while (and (not found) alist)
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162 (if (string-match (car (car alist)) filename)
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163 (setq codesys (cdr (car alist))
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164 found t))
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165 (setq alist (cdr alist))))
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166 (when codesys
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167 (if (functionp codesys)
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168 (setq codesys (funcall codesys 'insert-file-contents filename))
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169 )
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170 (cond ((consp codesys) (find-coding-system (car codesys)))
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171 ((find-coding-system codesys))
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172 ))))
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173
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174 (define-obsolete-function-alias
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175 'find-file-coding-system-from-filename
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176 'find-file-coding-system-for-read-from-filename)
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177
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178 (defun find-file-coding-system-for-write-from-filename (filename)
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179 "Look up coding system to write a file in `file-coding-system-alist'.
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180 The return value will be nil (no applicable entry) or a coding system
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181 object (the entry specified a coding system)."
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182 (let ((alist file-coding-system-alist)
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183 (found nil)
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184 (codesys nil))
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185 (let ((case-fold-search nil))
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186 (setq filename (file-name-sans-versions filename))
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187 (while (and (not found) alist)
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188 (if (string-match (car (car alist)) filename)
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189 (setq codesys (cdr (car alist))
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190 found t))
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191 (setq alist (cdr alist))))
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192 (when codesys
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193 (if (functionp codesys)
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194 (setq codesys (funcall codesys 'write-region filename))
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195 )
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196 (cond ((consp codesys) (find-coding-system (cdr codesys)))
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197 ((find-coding-system codesys))
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198 ))))
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199
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442
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200 ;; This is completely broken, not only in implementation (does not
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201 ;; understand MIME), but in concept -- such high-level decoding should
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202 ;; be done by mail readers, not by IO code!
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203
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204 ;(defun convert-mbox-coding-system (filename visit start end)
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205 ;...
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428
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206
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207 (defun find-coding-system-magic-cookie ()
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208 "Look for the coding-system magic cookie in the current buffer.\n"
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209 "The coding-system magic cookie is the exact string\n"
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210 "\";;;###coding system: \" followed by a valid coding system symbol,\n"
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211 "somewhere within the first 3000 characters of the file. If found,\n"
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212 "the coding system symbol is returned; otherwise nil is returned.\n"
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213 "Note that it is extremely unlikely that such a string would occur\n"
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214 "coincidentally as the result of encoding some characters in a non-ASCII\n"
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215 "charset, and that the spaces make it even less likely since the space\n"
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216 "character is not a valid octet in any ISO 2022 encoding of most non-ASCII\n"
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217 "charsets."
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218 (save-excursion
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219 (goto-char (point-min))
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220 (or (and (looking-at
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221 "^[^\n]*-\\*-[^\n]*coding: \\([^ \t\n;]+\\)[^\n]*-\\*-")
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222 (let ((codesys (intern (buffer-substring
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223 (match-beginning 1)(match-end 1)))))
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224 (if (find-coding-system codesys) codesys)))
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225 ;; (save-excursion
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226 ;; (let (start end)
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227 ;; (and (re-search-forward "^;+[ \t]*Local Variables:" nil t)
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228 ;; (setq start (match-end 0))
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229 ;; (re-search-forward "\n;+[ \t]*End:")
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230 ;; (setq end (match-beginning 0))
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231 ;; (save-restriction
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232 ;; (narrow-to-region start end)
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233 ;; (goto-char start)
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234 ;; (re-search-forward "^;;; coding: \\([^\n]+\\)$" nil t)
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235 ;; )
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236 ;; (let ((codesys
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237 ;; (intern (buffer-substring
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238 ;; (match-beginning 1)(match-end 1)))))
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239 ;; (if (find-coding-system codesys) codesys))
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240 ;; )))
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241 (let ((case-fold-search nil))
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242 (if (search-forward
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243 ";;;###coding system: " (+ (point-min) 3000) t)
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244 (let ((start (point))
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245 (end (progn
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246 (skip-chars-forward "^ \t\n\r")
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247 (point))))
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248 (if (> end start)
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249 (let ((codesys (intern (buffer-substring start end))))
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250 (if (find-coding-system codesys) codesys)))
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251 )))
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252 )))
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253
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254 (defun load (file &optional noerror nomessage nosuffix)
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255 "Execute a file of Lisp code named FILE.
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256 First tries FILE with .elc appended, then tries with .el,
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257 then tries FILE unmodified. Searches directories in load-path.
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258 If optional second arg NOERROR is non-nil,
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259 report no error if FILE doesn't exist.
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260 Print messages at start and end of loading unless
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261 optional third arg NOMESSAGE is non-nil.
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262 If optional fourth arg NOSUFFIX is non-nil, don't try adding
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263 suffixes .elc or .el to the specified name FILE.
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264 Return t if file exists."
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265 (let* ((filename (substitute-in-file-name file))
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266 (handler (find-file-name-handler filename 'load))
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267 (path nil))
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268 (if handler
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269 (funcall handler 'load filename noerror nomessage nosuffix)
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270 (if (or (<= (length filename) 0)
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271 (null (setq path
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272 (locate-file filename load-path
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273 (and (not nosuffix) '(".elc" ".el" ""))))))
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274 (and (null noerror)
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275 (signal 'file-error (list "Cannot open load file" filename)))
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276 ;; now use the internal load to actually load the file.
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277 (load-internal
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278 file noerror nomessage nosuffix
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279 (let ((elc ; use string= instead of string-match to keep match-data.
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280 (string= ".elc" (downcase (substring path -4)))))
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281 (or (and (not elc) coding-system-for-read) ; prefer for source file
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282 ;; find magic-cookie
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283 (save-excursion
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284 (set-buffer (get-buffer-create " *load*"))
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285 (erase-buffer)
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286 (let ((coding-system-for-read 'raw-text))
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287 (insert-file-contents path nil 1 3001))
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288 (find-coding-system-magic-cookie))
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289 (if elc
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290 ;; if reading a byte-compiled file and we didn't find
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291 ;; a coding-system magic cookie, then use `binary'.
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292 ;; We need to guarantee that we never do autodetection
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293 ;; on byte-compiled files because confusion here would
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294 ;; be a very bad thing. Pre-existing byte-compiled
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295 ;; files are always in the `binary' coding system.
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296 ;; Also, byte-compiled files always use `lf' to terminate
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297 ;; a line; don't risk confusion here either.
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298 'binary
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299 (or (find-file-coding-system-for-read-from-filename path)
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300 ;; looking up in `file-coding-system-alist'.
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301 ;; otherwise use `buffer-file-coding-system-for-read',
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302 ;; as normal
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303 buffer-file-coding-system-for-read)
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304 )))
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305 )))))
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306
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307 (defvar insert-file-contents-access-hook nil
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308 "A hook to make a file accessible before reading it.
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309 `insert-file-contents' calls this hook before doing anything else.
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310 Called with two arguments: FILENAME and VISIT, the same as the
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311 corresponding arguments in the call to `insert-file-contents'.")
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312
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313 (defvar insert-file-contents-pre-hook nil
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314 "A special hook to decide the coding system used for reading in a file.
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315
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316 Before reading a file, `insert-file-contents' calls the functions on
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317 this hook with arguments FILENAME and VISIT, the same as the
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318 corresponding arguments in the call to `insert-file-contents'. In
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319 these functions, you may refer to the global variable
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320 `buffer-file-coding-system-for-read'.
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321
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322 The return value of the functions should be either
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323
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324 -- nil
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325 -- A coding system or a symbol denoting it, indicating the coding system
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326 to be used for reading the file
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327 -- A list of two elements (absolute pathname and length of data inserted),
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328 which is used as the return value to `insert-file-contents'. In this
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329 case, `insert-file-contents' assumes that the function has inserted
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330 the file for itself and suppresses further reading.
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331
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332 If any function returns non-nil, the remaining functions are not called.")
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333
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334 (defvar insert-file-contents-error-hook nil
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335 "A hook to set `buffer-file-coding-system' when a read error has occurred.
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336
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337 When a file error (e.g. nonexistent file) occurs while read a file,
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338 `insert-file-contents' calls the functions on this hook with three
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339 arguments: FILENAME and VISIT (the same as the corresponding arguments
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340 in the call to `insert-file-contents') and a cons (SIGNALED-CONDITIONS
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341 . SIGNAL-DATA).
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342
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343 After calling this hook, the error is signalled for real and
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344 propagates to the caller of `insert-file-contents'.")
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345
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346 (defvar insert-file-contents-post-hook nil
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347 "A hook to set `buffer-file-coding-system' for the current buffer.
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348
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349 After successful reading, `insert-file-contents' calls the functions
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350 on this hook with four arguments: FILENAME and VISIT (the same as the
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351 corresponding arguments in the call to `insert-file-contents'),
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352 CODING-SYSTEM (the actual coding system used to decode the file), and
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353 a cons of absolute pathname and length of data inserted (the same
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354 thing as will be returned from `insert-file-contents').")
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355
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356 (defun insert-file-contents (filename &optional visit beg end replace)
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357 "Insert contents of file FILENAME after point.
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358 Returns list of absolute file name and length of data inserted.
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359 If second argument VISIT is non-nil, the buffer's visited filename
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360 and last save file modtime are set, and it is marked unmodified.
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361 If visiting and the file does not exist, visiting is completed
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362 before the error is signaled.
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363
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364 The optional third and fourth arguments BEG and END
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365 specify what portion of the file to insert.
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366 If VISIT is non-nil, BEG and END must be nil.
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367 If optional fifth argument REPLACE is non-nil,
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368 it means replace the current buffer contents (in the accessible portion)
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369 with the file contents. This is better than simply deleting and inserting
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370 the whole thing because (1) it preserves some marker positions
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371 and (2) it puts less data in the undo list.
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372
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373 The coding system used for decoding the file is determined as follows:
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374
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375 1. `coding-system-for-read', if non-nil.
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376 2. The result of `insert-file-contents-pre-hook', if non-nil.
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377 3. The matching value for this filename from
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378 `file-coding-system-alist', if any.
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379 4. `buffer-file-coding-system-for-read', if non-nil.
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380 5. The coding system 'raw-text.
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381
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382 If a local value for `buffer-file-coding-system' in the current buffer
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383 does not exist, it is set to the coding system which was actually used
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384 for reading.
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385
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386 See also `insert-file-contents-access-hook',
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387 `insert-file-contents-pre-hook', `insert-file-contents-error-hook',
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388 and `insert-file-contents-post-hook'."
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389 (let (return-val coding-system used-codesys)
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390 ;; OK, first load the file.
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391 (condition-case err
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392 (progn
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393 (run-hook-with-args 'insert-file-contents-access-hook
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394 filename visit)
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395 ;; determine the coding system to use, as described above.
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396 (setq coding-system
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397 (or
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398 ;; #1.
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399 coding-system-for-read
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400 ;; #2.
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401 (run-hook-with-args-until-success
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402 'insert-file-contents-pre-hook
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403 filename visit)
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404 ;; #3.
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405 (find-file-coding-system-for-read-from-filename filename)
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406 ;; #4.
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407 buffer-file-coding-system-for-read
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408 ;; #5.
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409 'raw-text))
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410 (if (consp coding-system)
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411 (setq return-val coding-system)
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412 (if (null (find-coding-system coding-system))
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413 (progn
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414 (message
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415 "Invalid coding-system (%s), using 'undecided"
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416 coding-system)
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417 (setq coding-system 'undecided)))
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418 (setq return-val
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419 (insert-file-contents-internal filename visit beg end
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420 replace coding-system
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421 ;; store here!
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422 'used-codesys))
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423 ))
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424 (file-error
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425 (run-hook-with-args 'insert-file-contents-error-hook
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426 filename visit err)
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427 (signal (car err) (cdr err))))
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428 (setq coding-system used-codesys)
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429 ;; call any `post-read-conversion' for the coding system that
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430 ;; was used ...
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431 (let ((func
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432 (coding-system-property coding-system 'post-read-conversion))
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433 (endmark (make-marker)))
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434 (set-marker endmark (+ (point) (nth 1 return-val)))
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435 (if func
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436 (unwind-protect
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437 (save-excursion
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438 (let (buffer-read-only)
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439 (funcall func (point) (marker-position endmark))))
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440 (if visit
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441 (progn
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442 (set-buffer-auto-saved)
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443 (set-buffer-modified-p nil)))))
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444 (setcar (cdr return-val) (- (marker-position endmark) (point))))
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445 ;; now finally set the buffer's `buffer-file-coding-system'.
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446 (if (run-hook-with-args-until-success 'insert-file-contents-post-hook
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447 filename visit return-val)
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448 nil
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449 (if (local-variable-p 'buffer-file-coding-system (current-buffer))
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450 ;; if buffer-file-coding-system is already local, just
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451 ;; set its eol type to what was found, if it wasn't
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452 ;; set already.
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453 (set-buffer-file-coding-system
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454 (subsidiary-coding-system buffer-file-coding-system
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455 (coding-system-eol-type coding-system)))
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456 ;; otherwise actually set buffer-file-coding-system.
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457 (set-buffer-file-coding-system coding-system)))
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458 return-val))
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459
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460 (defvar write-region-pre-hook nil
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461 "A special hook to decide the coding system used for writing out a file.
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462
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463 Before writing a file, `write-region' calls the functions on this hook
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464 with arguments START, END, FILENAME, APPEND, VISIT, and CODING-SYSTEM,
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465 the same as the corresponding arguments in the call to
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466 `write-region'.
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467
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468 The return value of the functions should be either
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469
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470 -- nil
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471 -- A coding system or a symbol denoting it, indicating the coding system
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472 to be used for reading the file
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473 -- A list of two elements (absolute pathname and length of data written),
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|
474 which is used as the return value to `write-region'. In this
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475 case, `write-region' assumes that the function has written
|
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476 the file for itself and suppresses further writing.
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477
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478 If any function returns non-nil, the remaining functions are not called.")
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479
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|
|
480 (defvar write-region-post-hook nil
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|
|
481 "A hook called by `write-region' after a file has been written out.
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482
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|
483 The functions on this hook are called with arguments START, END,
|
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|
484 FILENAME, APPEND, VISIT, and CODING-SYSTEM, the same as the
|
|
|
485 corresponding arguments in the call to `write-region'.")
|
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|
486
|
|
|
487 (defun write-region (start end filename &optional append visit lockname coding-system)
|
|
|
488 "Write current region into specified file.
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|
|
489 By default the file's existing contents are replaced by the specified region.
|
|
|
490 When called from a program, takes three arguments:
|
|
|
491 START, END and FILENAME. START and END are buffer positions.
|
|
|
492 Optional fourth argument APPEND if non-nil means
|
|
|
493 append to existing file contents (if any).
|
|
|
494 Optional fifth argument VISIT if t means
|
|
|
495 set last-save-file-modtime of buffer to this file's modtime
|
|
|
496 and mark buffer not modified.
|
|
|
497 If VISIT is a string, it is a second file name;
|
|
|
498 the output goes to FILENAME, but the buffer is marked as visiting VISIT.
|
|
|
499 VISIT is also the file name to lock and unlock for clash detection.
|
|
|
500 If VISIT is neither t nor nil nor a string,
|
|
|
501 that means do not print the \"Wrote file\" message.
|
|
|
502 The optional sixth arg LOCKNAME, if non-nil, specifies the name to
|
|
|
503 use for locking and unlocking, overriding FILENAME and VISIT.
|
|
|
504 Kludgy feature: if START is a string, then that string is written
|
|
|
505 to the file, instead of any buffer contents, and END is ignored.
|
|
|
506 Optional seventh argument CODING-SYSTEM specifies the coding system
|
|
|
507 used to encode the text when it is written out, and defaults to
|
|
|
508 the value of `buffer-file-coding-system' in the current buffer.
|
|
|
509 Interactively, with a prefix arg, you will be prompted for the
|
|
|
510 coding system.
|
|
|
511 See also `write-region-pre-hook' and `write-region-post-hook'."
|
|
|
512 (interactive "r\nFWrite region to file: \ni\ni\ni\nZCoding-system: ")
|
|
|
513 (setq coding-system
|
|
|
514 (or coding-system-for-write
|
|
|
515 (run-hook-with-args-until-success
|
|
|
516 'write-region-pre-hook start end filename append visit lockname)
|
|
|
517 coding-system
|
|
|
518 buffer-file-coding-system
|
|
|
519 (find-file-coding-system-for-write-from-filename filename)
|
|
|
520 ))
|
|
|
521 (if (consp coding-system)
|
|
|
522 coding-system
|
|
|
523 (let ((func
|
|
|
524 (coding-system-property coding-system 'pre-write-conversion)))
|
|
|
525 (if func
|
|
|
526 (let ((curbuf (current-buffer))
|
|
|
527 (tempbuf (generate-new-buffer " *temp-write-buffer*"))
|
|
|
528 (modif (buffer-modified-p)))
|
|
|
529 (unwind-protect
|
|
|
530 (save-excursion
|
|
|
531 (set-buffer tempbuf)
|
|
|
532 (erase-buffer)
|
|
|
533 (insert-buffer-substring curbuf start end)
|
|
|
534 (funcall func (point-min) (point-max))
|
|
|
535 (write-region-internal (point-min) (point-max) filename
|
|
|
536 append
|
|
|
537 (if (eq visit t) nil visit)
|
|
|
538 lockname
|
|
|
539 coding-system))
|
|
|
540 ;; leaving a buffer associated with file will cause problems
|
|
|
541 ;; when next visiting.
|
|
|
542 (kill-buffer tempbuf)
|
|
|
543 (if (or visit (null modif))
|
|
|
544 (progn
|
|
|
545 (set-buffer-auto-saved)
|
|
|
546 (set-buffer-modified-p nil)
|
|
|
547 (if (buffer-file-name) (set-visited-file-modtime))))))
|
|
|
548 (write-region-internal start end filename append visit lockname
|
|
|
549 coding-system)))
|
|
|
550 (run-hook-with-args 'write-region-post-hook
|
|
|
551 start end filename append visit lockname
|
|
|
552 coding-system)))
|
|
|
553
|
|
|
554 ;;; code-files.el ends here
|
