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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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793
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6 ;; Copyright (C) 2001, 2002 Ben Wing.
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428
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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444
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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428
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Synched up with: Not synched.
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26
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27 ;;; Commentary:
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28
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29 ;; Derived from mule.el in the original Mule but heavily modified
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30 ;; by Ben Wing.
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31
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32 ;; 1997/3/11 modified by MORIOKA Tomohiko to sync with Emacs 20 API.
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33
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34 ;; This file was derived from the former mule-files.el which has been removed
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35 ;; as of XEmacs 21.2.15.
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36
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37 ;;; Code:
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38
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39 (put 'buffer-file-coding-system 'permanent-local t)
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40
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771
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41 (defvar buffer-file-coding-system-when-loaded nil
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42 "Coding system used when current buffer's file was read in.
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43
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44 Automatically buffer-local when set in any fashion. This is set
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45 automatically when a file is loaded and is used when the file needs to be
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46 reloaded (e.g. `revert-buffer'). Normally this will have the same value as
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47 `buffer-file-coding-system', but the latter may be changed because it's
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48 also used to specify the encoding when the file is written out.")
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49 (make-variable-buffer-local 'buffer-file-coding-system-when-loaded)
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50 (put 'buffer-file-coding-system-when-loaded 'permanent-local t)
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51
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428
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52 (define-obsolete-variable-alias
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53 'file-coding-system
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54 'buffer-file-coding-system)
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55
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56 (define-obsolete-variable-alias
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57 'overriding-file-coding-system
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58 'coding-system-for-read)
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59
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771
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60 ;; NOTE: The real default value is set in code-init.el.
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61 (defvar buffer-file-coding-system-for-read nil
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62 "Default coding system used when reading a file.
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428
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63 This provides coarse-grained control; for finer-grained control, use
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64 `file-coding-system-alist'. From a Lisp program, if you wish to
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65 unilaterally specify the coding system used for one particular
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66 operation, you should bind the variable `coding-system-for-read'
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67 rather than setting this variable, which is intended to be used for
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771
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68 global environment specification.
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69
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70 See `insert-file-contents' for a full description of how a file's
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71 coding system is determined when it is read in.")
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428
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72
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73 (define-obsolete-variable-alias
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74 'file-coding-system-for-read
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75 'buffer-file-coding-system-for-read)
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76
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77 (defvar file-coding-system-alist
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78 `(
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79 ;; This must not be necessary, slb suggests -kkm
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80 ;; ("loaddefs.el$" . (binary . binary))
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81 ,@(mapcar
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82 #'(lambda (regexp) (cons regexp 'binary)) binary-file-regexps)
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83 ("TUTORIAL\\.\\(?:hr\\|pl\\|ro\\)\\'" . iso-8859-2)
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84 ;; ("\\.\\(el\\|emacs\\|info\\(-[0-9]+\\)?\\|texi\\)$" . iso-2022-8)
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85 ;; ("\\(ChangeLog\\|CHANGES-beta\\)$" . iso-2022-8)
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442
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86
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87 ;; This idea is totally broken, and the code didn't work anyway.
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88 ;; Mailboxes should be decoded by mail clients, who actually know
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89 ;; how to deal with them. Otherwise, their contents should be
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90 ;; treated as `binary'.
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91 ;("/spool/mail/.*$" . convert-mbox-coding-system)
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92 )
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428
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93 "Alist to decide a coding system to use for a file I/O operation.
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94 The format is ((PATTERN . VAL) ...),
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95 where PATTERN is a regular expression matching a file name,
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96 VAL is a coding system, a cons of coding systems, or a function symbol.
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97 If VAL is a coding system, it is used for both decoding and encoding
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98 the file contents.
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99 If VAL is a cons of coding systems, the car part is used for decoding,
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100 and the cdr part is used for encoding.
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101 If VAL is a function symbol, the function must return a coding system
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102 or a cons of coding systems which are used as above.
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103
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104 This overrides the more general specification in
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105 `buffer-file-coding-system-for-read', but is overridden by
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106 `coding-system-for-read'.")
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107
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108 (defun set-buffer-file-coding-system (coding-system &optional force)
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109 "Set buffer-file-coding-system of the current buffer to CODING-SYSTEM.
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110 If optional argument FORCE (interactively, the prefix argument) is not
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111 given, attempt to match the EOL type of the new coding system to
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112 the current value of `buffer-file-coding-system'."
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113 (interactive "zFile coding system: \nP")
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114 (get-coding-system coding-system) ;; correctness check
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115 (if (not force)
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116 (setq coding-system
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117 (subsidiary-coding-system
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118 coding-system
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119 (coding-system-eol-type buffer-file-coding-system))))
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120 (setq buffer-file-coding-system coding-system)
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121 (redraw-modeline t))
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122
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123 (defun toggle-buffer-file-coding-system ()
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124 "Set EOL type of buffer-file-coding-system of the current buffer to
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125 something other than what it is at the moment."
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126 (interactive)
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127 (let ((eol-type
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128 (coding-system-eol-type buffer-file-coding-system)))
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129 (setq buffer-file-coding-system
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130 (subsidiary-coding-system
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131 (coding-system-base buffer-file-coding-system)
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132 (cond ((eq eol-type 'lf) 'crlf)
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133 ((eq eol-type 'crlf) 'lf)
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134 ((eq eol-type 'cr) 'lf))))
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135 (set-buffer-modified-p t)))
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428
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136
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137 (define-obsolete-function-alias
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138 'set-file-coding-system
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139 'set-buffer-file-coding-system)
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140
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141 (defun set-buffer-file-coding-system-for-read (coding-system)
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142 "Set the coding system used when reading in a file.
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143 This is equivalent to setting the variable
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144 `buffer-file-coding-system-for-read'. You can also use
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145 `file-coding-system-alist' to specify the coding system for
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146 particular files."
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147 (interactive "zFile coding system for read: ")
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148 (get-coding-system coding-system) ;; correctness check
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149 (setq buffer-file-coding-system-for-read coding-system))
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150
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151 (define-obsolete-function-alias
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152 'set-file-coding-system-for-read
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153 'set-buffer-file-coding-system-for-read)
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154
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155 (defun set-default-buffer-file-coding-system (coding-system)
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156 "Set the default value of `buffer-file-coding-system' to CODING-SYSTEM.
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157 The default value is used both for buffers without associated files
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158 and for files with no apparent coding system (i.e. primarily ASCII).
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159 See `buffer-file-coding-system' for more information."
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160 (interactive "zDefault file coding system: ")
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161 (setq-default buffer-file-coding-system coding-system)
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162 (redraw-modeline t))
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163
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164 (define-obsolete-function-alias
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165 'set-default-file-coding-system
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166 'set-default-buffer-file-coding-system)
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167
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168 (defun find-file-coding-system-for-read-from-filename (filename)
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169 "Look up coding system to read a file in `file-coding-system-alist'.
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170 The return value will be nil (no applicable entry) or a coding system
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171 object (the entry specified a coding system)."
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172 (let ((alist file-coding-system-alist)
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173 (found nil)
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174 (codesys nil))
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175 (let ((case-fold-search nil))
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176 (setq filename (file-name-sans-versions filename))
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177 (while (and (not found) alist)
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178 (if (string-match (car (car alist)) filename)
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179 (setq codesys (cdr (car alist))
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180 found t))
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181 (setq alist (cdr alist))))
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182 (when codesys
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183 (if (functionp codesys)
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184 (setq codesys (funcall codesys 'insert-file-contents filename))
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185 )
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186 (cond ((consp codesys) (find-coding-system (car codesys)))
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187 ((find-coding-system codesys))
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188 ))))
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189
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190 (define-obsolete-function-alias
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191 'find-file-coding-system-from-filename
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192 'find-file-coding-system-for-read-from-filename)
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193
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194 (defun find-file-coding-system-for-write-from-filename (filename)
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195 "Look up coding system to write a file in `file-coding-system-alist'.
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196 The return value will be nil (no applicable entry) or a coding system
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197 object (the entry specified a coding system)."
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198 (let ((alist file-coding-system-alist)
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199 (found nil)
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200 (codesys nil))
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201 (let ((case-fold-search nil))
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202 (setq filename (file-name-sans-versions filename))
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203 (while (and (not found) alist)
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204 (if (string-match (car (car alist)) filename)
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205 (setq codesys (cdr (car alist))
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206 found t))
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207 (setq alist (cdr alist))))
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208 (when codesys
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209 (if (functionp codesys)
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210 (setq codesys (funcall codesys 'write-region filename))
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211 )
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212 (cond ((consp codesys) (find-coding-system (cdr codesys)))
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213 ((find-coding-system codesys))
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214 ))))
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215
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748
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216 ;; This was completely broken, not only in implementation (does not
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442
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217 ;; understand MIME), but in concept -- such high-level decoding should
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748
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218 ;; be done by mail readers, not by IO code! Removed 2000-04-18.
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442
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219
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748
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220 ;(defun convert-mbox-coding-system (filename visit start end) ...)
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428
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221
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222 (defun load (file &optional noerror nomessage nosuffix)
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883
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223 "Execute a file of Lisp code named FILE, or load a binary module.
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224 First tries to find a Lisp FILE with .elc appended, then with .el, then with
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225 FILE unmodified. If unsuccessful, tries to find a binary module FILE with
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226 .ell appended, then with .dll, then with .so, and finally unmodified.
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227 Searches directories in load-path for Lisp files, and in module-load-path
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228 for binary modules.
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428
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229 If optional second arg NOERROR is non-nil,
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230 report no error if FILE doesn't exist.
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231 Print messages at start and end of loading unless
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232 optional third arg NOMESSAGE is non-nil.
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233 If optional fourth arg NOSUFFIX is non-nil, don't try adding
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883
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234 suffixes .elc, .el, or .ell to the specified name FILE.
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428
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235 Return t if file exists."
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236 (let* ((filename (substitute-in-file-name file))
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237 (handler (find-file-name-handler filename 'load))
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238 (path nil))
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239 (if handler
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240 (funcall handler 'load filename noerror nomessage nosuffix)
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883
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241 ;; First try to load a Lisp file
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242 (if (and (> (length filename) 0)
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243 (setq path (locate-file filename load-path
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502
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244 (and (not nosuffix)
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883
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245 '(".elc" ".el" "")))))
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246 ;; now use the internal load to actually load the file.
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247 (load-internal
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248 file noerror nomessage nosuffix
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249 (let ((elc ; use string= instead of string-match to keep match-data.
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801
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250 (equalp ".elc" (substring path -4))))
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883
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251 (or (and (not elc) coding-system-for-read) ;prefer for source file
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252 ;; find magic-cookie
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253 (let ((codesys
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254 (find-coding-system-magic-cookie-in-file path)))
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255 (when codesys
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256 (setq codesys (intern codesys))
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257 (if (find-coding-system codesys) codesys)))
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258 (if elc
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259 ;; if reading a byte-compiled file and we didn't find
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260 ;; a coding-system magic cookie, then use `binary'.
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261 ;; We need to guarantee that we never do autodetection
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262 ;; on byte-compiled files because confusion here would
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263 ;; be a very bad thing. Pre-existing byte-compiled
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264 ;; files are always in the `binary' coding system.
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265 ;; Also, byte-compiled files always use `lf' to terminate
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266 ;; a line; don't risk confusion here either.
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267 'binary
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268 (or (find-file-coding-system-for-read-from-filename path)
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269 ;; looking up in `file-coding-system-alist'.
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270 ;; otherwise use `buffer-file-coding-system-for-read',
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271 ;; as normal
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272 buffer-file-coding-system-for-read)
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273 ))))
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274 ;; The file name is invalid, or we want to load a binary module
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275 (if (and (> (length filename) 0)
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996
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276 (locate-file filename module-load-path
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277 (and (not nosuffix)
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278 '(".ell" ".dll" ".so" ""))))
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883
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279 (if (featurep 'modules)
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280 (let ((load-modules-quietly nomessage))
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996
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281 (load-module filename))
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883
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282 (signal 'file-error '("This XEmacs does not support modules")))
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283 (and (null noerror)
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284 (signal 'file-error (list "Cannot open load file" filename))))
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285 ))))
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428
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286
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287 (defvar insert-file-contents-access-hook nil
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288 "A hook to make a file accessible before reading it.
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289 `insert-file-contents' calls this hook before doing anything else.
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290 Called with two arguments: FILENAME and VISIT, the same as the
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291 corresponding arguments in the call to `insert-file-contents'.")
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292
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293 (defvar insert-file-contents-pre-hook nil
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294 "A special hook to decide the coding system used for reading in a file.
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295
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296 Before reading a file, `insert-file-contents' calls the functions on
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297 this hook with arguments FILENAME and VISIT, the same as the
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298 corresponding arguments in the call to `insert-file-contents'. In
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299 these functions, you may refer to the global variable
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300 `buffer-file-coding-system-for-read'.
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301
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302 The return value of the functions should be either
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303
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304 -- nil
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305 -- A coding system or a symbol denoting it, indicating the coding system
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306 to be used for reading the file
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307 -- A list of two elements (absolute pathname and length of data inserted),
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308 which is used as the return value to `insert-file-contents'. In this
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309 case, `insert-file-contents' assumes that the function has inserted
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310 the file for itself and suppresses further reading.
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311
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312 If any function returns non-nil, the remaining functions are not called.")
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313
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314 (defvar insert-file-contents-error-hook nil
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315 "A hook to set `buffer-file-coding-system' when a read error has occurred.
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316
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317 When a file error (e.g. nonexistent file) occurs while read a file,
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318 `insert-file-contents' calls the functions on this hook with three
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319 arguments: FILENAME and VISIT (the same as the corresponding arguments
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320 in the call to `insert-file-contents') and a cons (SIGNALED-CONDITIONS
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321 . SIGNAL-DATA).
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322
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323 After calling this hook, the error is signalled for real and
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324 propagates to the caller of `insert-file-contents'.")
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325
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326 (defvar insert-file-contents-post-hook nil
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327 "A hook to set `buffer-file-coding-system' for the current buffer.
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328
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329 After successful reading, `insert-file-contents' calls the functions
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330 on this hook with four arguments: FILENAME and VISIT (the same as the
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331 corresponding arguments in the call to `insert-file-contents'),
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332 CODING-SYSTEM (the actual coding system used to decode the file), and
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333 a cons of absolute pathname and length of data inserted (the same
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334 thing as will be returned from `insert-file-contents').")
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335
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444
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336 (defun insert-file-contents (filename &optional visit start end replace)
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428
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337 "Insert contents of file FILENAME after point.
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338 Returns list of absolute file name and length of data inserted.
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339 If second argument VISIT is non-nil, the buffer's visited filename
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340 and last save file modtime are set, and it is marked unmodified.
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341 If visiting and the file does not exist, visiting is completed
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342 before the error is signaled.
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343
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444
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344 The optional third and fourth arguments START and END
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428
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345 specify what portion of the file to insert.
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444
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346 If VISIT is non-nil, START and END must be nil.
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428
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347 If optional fifth argument REPLACE is non-nil,
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348 it means replace the current buffer contents (in the accessible portion)
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349 with the file contents. This is better than simply deleting and inserting
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350 the whole thing because (1) it preserves some marker positions
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351 and (2) it puts less data in the undo list.
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352
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353 The coding system used for decoding the file is determined as follows:
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354
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771
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355 1. `coding-system-for-read', if non-nil. (Intended as a temporary overriding
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356 mechanism for use by Lisp code.)
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357 2. The result of `insert-file-contents-pre-hook', if non-nil. (Intended for
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358 handling tricky cases where the coding system of the file cannot be
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359 determined just by looking at the filename's extension and the standard
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360 auto-detection mechanism isn't suitable, so more clever code is required.
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361 In general, this hook should rarely be used.)
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362 3. The matching value for this filename from `file-coding-system-alist',
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363 if any. (Intended as the standard way of determining encoding from
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364 the name, or esp. the extension, of the file. Akin to the way
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365 file-name extensions are used under MS Windows to determine how to
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366 handle the file, but more flexible.)
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367 4. `buffer-file-coding-system-for-read', if non-nil. (Intended to be where
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368 the global default coding system is set. Usually, you want to use
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369 the value `undecided', to let the system auto-detect according to the
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370 priorities set up by `set-coding-priority-list'. This is usually
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371 initialized from the `coding-system' property of the current language
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372 environment.)
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428
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373 5. The coding system 'raw-text.
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374
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375 If a local value for `buffer-file-coding-system' in the current buffer
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376 does not exist, it is set to the coding system which was actually used
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377 for reading.
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378
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771
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379 #### This should explain in more detail the exact workings of the
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380 coding-system determination procedure.
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381
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428
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382 See also `insert-file-contents-access-hook',
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383 `insert-file-contents-pre-hook', `insert-file-contents-error-hook',
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384 and `insert-file-contents-post-hook'."
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385 (let (return-val coding-system used-codesys)
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386 ;; OK, first load the file.
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387 (condition-case err
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388 (progn
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389 (run-hook-with-args 'insert-file-contents-access-hook
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390 filename visit)
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391 ;; determine the coding system to use, as described above.
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392 (setq coding-system
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393 (or
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394 ;; #1.
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395 coding-system-for-read
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396 ;; #2.
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397 (run-hook-with-args-until-success
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398 'insert-file-contents-pre-hook
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399 filename visit)
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400 ;; #3.
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401 (find-file-coding-system-for-read-from-filename filename)
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402 ;; #4.
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403 buffer-file-coding-system-for-read
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404 ;; #5.
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405 'raw-text))
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406 (if (consp coding-system)
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407 (setq return-val coding-system)
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408 (if (null (find-coding-system coding-system))
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409 (progn
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793
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410 (lwarn 'coding-system 'notice
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428
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411 "Invalid coding-system (%s), using 'undecided"
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412 coding-system)
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413 (setq coding-system 'undecided)))
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414 (setq return-val
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444
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415 (insert-file-contents-internal filename visit start end
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428
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416 replace coding-system
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417 ;; store here!
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418 'used-codesys))
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419 ))
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420 (file-error
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421 (run-hook-with-args 'insert-file-contents-error-hook
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422 filename visit err)
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423 (signal (car err) (cdr err))))
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424 (setq coding-system used-codesys)
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425 ;; call any `post-read-conversion' for the coding system that
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426 ;; was used ...
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427 (let ((func
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428 (coding-system-property coding-system 'post-read-conversion))
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429 (endmark (make-marker)))
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430 (set-marker endmark (+ (point) (nth 1 return-val)))
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431 (if func
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432 (unwind-protect
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433 (save-excursion
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434 (let (buffer-read-only)
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771
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435 (if (>= (function-max-args func) 2)
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436 ;; #### fuckme! Someone at FSF changed the calling
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437 ;; convention of post-read-conversion. We try to
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438 ;; support the old way. #### Should we kill this?
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439 (funcall func (point) (marker-position endmark))
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440 (funcall func (- (marker-position endmark) (point))))))
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428
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441 (if visit
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442 (progn
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443 (set-buffer-auto-saved)
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444 (set-buffer-modified-p nil)))))
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445 (setcar (cdr return-val) (- (marker-position endmark) (point))))
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771
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446 ;; now finally set the buffer's `buffer-file-coding-system' ...
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428
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447 (if (run-hook-with-args-until-success 'insert-file-contents-post-hook
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448 filename visit return-val)
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449 nil
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450 (if (local-variable-p 'buffer-file-coding-system (current-buffer))
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451 ;; if buffer-file-coding-system is already local, just
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452 ;; set its eol type to what was found, if it wasn't
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453 ;; set already.
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454 (set-buffer-file-coding-system
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455 (subsidiary-coding-system buffer-file-coding-system
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456 (coding-system-eol-type coding-system)))
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457 ;; otherwise actually set buffer-file-coding-system.
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458 (set-buffer-file-coding-system coding-system)))
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771
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459 ;; ... and `buffer-file-coding-system-when-loaded'. the machinations
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460 ;; of set-buffer-file-coding-system cause the actual coding system
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461 ;; object to be stored, so do that here, too.
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462 (setq buffer-file-coding-system-when-loaded
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463 (get-coding-system coding-system))
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428
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464 return-val))
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465
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466 (defvar write-region-pre-hook nil
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467 "A special hook to decide the coding system used for writing out a file.
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468
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748
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469 Before writing a file, `write-region' calls the functions on this hook with
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863
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470 arguments START, END, FILENAME, APPEND, VISIT, LOCKNAME and CODING-SYSTEM,
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748
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471 the same as the corresponding arguments in the call to `write-region'.
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428
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472
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748
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473 The return value of each function should be one of
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428
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474
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475 -- nil
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476 -- A coding system or a symbol denoting it, indicating the coding system
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863
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477 to be used for writing the file
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428
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478 -- A list of two elements (absolute pathname and length of data written),
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863
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479 which is used as the return value to `write-region'. In this case,
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480 `write-region' assumes that the function has written the file and
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481 returns.
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428
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482
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483 If any function returns non-nil, the remaining functions are not called.")
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484
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485 (defvar write-region-post-hook nil
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486 "A hook called by `write-region' after a file has been written out.
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487
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488 The functions on this hook are called with arguments START, END,
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748
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489 FILENAME, APPEND, VISIT, LOCKNAME, and CODING-SYSTEM, the same as the
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428
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490 corresponding arguments in the call to `write-region'.")
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491
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863
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492 (defun write-region (start end filename
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493 &optional append visit lockname coding-system)
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428
|
494 "Write current region into specified file.
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495 By default the file's existing contents are replaced by the specified region.
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863
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496 Called interactively, prompts for a file name. With a prefix arg, prompts
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497 for a coding system as well.
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748
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498
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499 When called from a program, takes three required arguments:
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428
|
500 START, END and FILENAME. START and END are buffer positions.
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501 Optional fourth argument APPEND if non-nil means
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502 append to existing file contents (if any).
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503 Optional fifth argument VISIT if t means
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504 set last-save-file-modtime of buffer to this file's modtime
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505 and mark buffer not modified.
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506 If VISIT is a string, it is a second file name;
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507 the output goes to FILENAME, but the buffer is marked as visiting VISIT.
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508 VISIT is also the file name to lock and unlock for clash detection.
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509 If VISIT is neither t nor nil nor a string,
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510 that means do not print the \"Wrote file\" message.
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511 The optional sixth arg LOCKNAME, if non-nil, specifies the name to
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512 use for locking and unlocking, overriding FILENAME and VISIT.
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513 Kludgy feature: if START is a string, then that string is written
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514 to the file, instead of any buffer contents, and END is ignored.
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515 Optional seventh argument CODING-SYSTEM specifies the coding system
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516 used to encode the text when it is written out, and defaults to
|
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517 the value of `buffer-file-coding-system' in the current buffer.
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518 See also `write-region-pre-hook' and `write-region-post-hook'."
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519 (interactive "r\nFWrite region to file: \ni\ni\ni\nZCoding-system: ")
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520 (setq coding-system
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521 (or coding-system-for-write
|
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522 (run-hook-with-args-until-success
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|
748
|
523 'write-region-pre-hook
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524 start end filename append visit lockname coding-system)
|
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428
|
525 coding-system
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526 buffer-file-coding-system
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527 (find-file-coding-system-for-write-from-filename filename)
|
|
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528 ))
|
|
|
529 (if (consp coding-system)
|
|
748
|
530 ;; One of the `write-region-pre-hook' functions wrote the file
|
|
428
|
531 coding-system
|
|
|
532 (let ((func
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533 (coding-system-property coding-system 'pre-write-conversion)))
|
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|
534 (if func
|
|
|
535 (let ((curbuf (current-buffer))
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536 (tempbuf (generate-new-buffer " *temp-write-buffer*"))
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|
|
537 (modif (buffer-modified-p)))
|
|
|
538 (unwind-protect
|
|
|
539 (save-excursion
|
|
|
540 (set-buffer tempbuf)
|
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|
541 (erase-buffer)
|
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542 (insert-buffer-substring curbuf start end)
|
|
|
543 (funcall func (point-min) (point-max))
|
|
|
544 (write-region-internal (point-min) (point-max) filename
|
|
|
545 append
|
|
|
546 (if (eq visit t) nil visit)
|
|
|
547 lockname
|
|
|
548 coding-system))
|
|
|
549 ;; leaving a buffer associated with file will cause problems
|
|
|
550 ;; when next visiting.
|
|
|
551 (kill-buffer tempbuf)
|
|
|
552 (if (or visit (null modif))
|
|
|
553 (progn
|
|
|
554 (set-buffer-auto-saved)
|
|
|
555 (set-buffer-modified-p nil)
|
|
|
556 (if (buffer-file-name) (set-visited-file-modtime))))))
|
|
|
557 (write-region-internal start end filename append visit lockname
|
|
|
558 coding-system)))
|
|
|
559 (run-hook-with-args 'write-region-post-hook
|
|
|
560 start end filename append visit lockname
|
|
|
561 coding-system)))
|
|
|
562
|
|
|
563 ;;; code-files.el ends here
|
