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259
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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 ;; This file is very similar to mule-files.el
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; 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 ;;; Code:
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34
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35 (setq-default buffer-file-coding-system 'undecided)
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36 (put 'buffer-file-coding-system 'permanent-local t)
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37
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38 (define-obsolete-variable-alias
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39 'file-coding-system
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40 'buffer-file-coding-system)
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41
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42 (define-obsolete-variable-alias
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43 'overriding-file-coding-system
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44 'coding-system-for-read)
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45
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46 (defvar buffer-file-coding-system-for-read 'undecided
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47 "Coding system used when reading a file.
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48 This provides coarse-grained control; for finer-grained control, use
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49 `file-coding-system-alist'. From a Lisp program, if you wish to
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50 unilaterally specify the coding system used for one particular
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51 operation, you should bind the variable `coding-system-for-read'
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52 rather than setting this variable, which is intended to be used for
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53 global environment specification.")
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54
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55 (define-obsolete-variable-alias
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56 'file-coding-system-for-read
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57 'buffer-file-coding-system-for-read)
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58
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59 (defvar file-coding-system-alist
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60 '(("\\.elc$" . (binary . binary))
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61 ("loaddefs.el$" . (binary . binary))
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62 ("\\.tar$" . (binary . binary))
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63 ("\\.\\(tif\\|tiff\\)$" . (binary . binary))
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64 ("\\.png$" . (binary . binary))
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65 ("\\.gif$" . (binary . binary))
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66 ("\\.\\(jpeg\\|jpg\\)$" . (binary . binary))
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67 ("TUTORIAL\\.hr$" . iso-8859-2)
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68 ("TUTORIAL\\.pl$" . iso-8859-2)
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69 ;; ("\\.\\(el\\|emacs\\|info\\(-[0-9]+\\)?\\|texi\\)$" . iso-2022-8)
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70 ;; ("\\(ChangeLog\\|CHANGES-beta\\)$" . iso-2022-8)
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71 ("\\.\\(gz\\|Z\\)$" . binary)
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72 ("/spool/mail/.*$" . convert-mbox-coding-system))
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73 "Alist to decide a coding system to use for a file I/O operation.
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74 The format is ((PATTERN . VAL) ...),
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75 where PATTERN is a regular expression matching a file name,
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76 VAL is a coding system, a cons of coding systems, or a function symbol.
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77 If VAL is a coding system, it is used for both decoding and encoding
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78 the file contents.
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79 If VAL is a cons of coding systems, the car part is used for decoding,
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80 and the cdr part is used for encoding.
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81 If VAL is a function symbol, the function must return a coding system
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82 or a cons of coding systems which are used as above.
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83
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84 This overrides the more general specification in
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85 `buffer-file-coding-system-for-read', but is overridden by
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86 `coding-system-for-read'.")
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87
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88 (defun set-buffer-file-coding-system (coding-system &optional force)
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89 "Set buffer-file-coding-system of the current buffer to CODING-SYSTEM.
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90 If optional argument FORCE (interactively, the prefix argument) is not
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91 given, attempt to match the EOL type of the new coding system to
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92 the current value of `buffer-file-coding-system'."
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93 (interactive "zFile coding system: \nP")
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94 (get-coding-system coding-system) ;; correctness check
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95 (if (not force)
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96 (setq coding-system
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97 (subsidiary-coding-system
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98 coding-system
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99 (coding-system-eol-type buffer-file-coding-system))))
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100 (setq buffer-file-coding-system coding-system)
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101 (redraw-modeline t))
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102
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103 (defun toggle-buffer-file-coding-system ()
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104 "Set EOL type of buffer-file-coding-system of the current buffer to
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105 something other than what it is at the moment."
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106 (interactive)
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107 (let ((eol-type
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108 (coding-system-eol-type buffer-file-coding-system)))
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109 (setq buffer-file-coding-system
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110 (subsidiary-coding-system
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111 (coding-system-base buffer-file-coding-system)
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112 (cond ((eq eol-type 'lf) 'crlf)
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113 ((eq eol-type 'crlf) 'lf)
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114 ((eq eol-type 'cr) 'lf))))))
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115
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116 (define-obsolete-function-alias
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117 'set-file-coding-system
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118 'set-buffer-file-coding-system)
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119
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120 (defun set-buffer-file-coding-system-for-read (coding-system)
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121 "Set the coding system used when reading in a file.
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122 This is equivalent to setting the variable
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123 `buffer-file-coding-system-for-read'. You can also use
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124 `file-coding-system-alist' to specify the coding system for
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125 particular files."
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126 (interactive "zFile coding system for read: ")
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127 (get-coding-system coding-system) ;; correctness check
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128 (setq buffer-file-coding-system-for-read coding-system))
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129
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130 (define-obsolete-function-alias
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131 'set-file-coding-system-for-read
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132 'set-buffer-file-coding-system-for-read)
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133
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134 (defun set-default-buffer-file-coding-system (coding-system)
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135 "Set the default value of `buffer-file-coding-system' to CODING-SYSTEM.
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136 The default value is used both for buffers without associated files
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137 and for files with no apparent coding system (i.e. primarily ASCII).
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138 See `buffer-file-coding-system' for more information."
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139 (interactive "zDefault file coding system: ")
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140 (setq-default buffer-file-coding-system coding-system)
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141 (redraw-modeline t))
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142
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143 (define-obsolete-function-alias
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144 'set-default-file-coding-system
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145 'set-default-buffer-file-coding-system)
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146
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147 (defun find-file-coding-system-for-read-from-filename (filename)
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148 "Look up coding system to read a file in `file-coding-system-alist'.
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149 The return value will be nil (no applicable entry) or a coding system
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150 object (the entry specified a coding system)."
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151 (let ((alist file-coding-system-alist)
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152 (found nil)
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153 (codesys nil))
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154 (let ((case-fold-search (eq system-type 'vax-vms)))
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155 (setq filename (file-name-sans-versions filename))
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156 (while (and (not found) alist)
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157 (if (string-match (car (car alist)) filename)
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158 (setq codesys (cdr (car alist))
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159 found t))
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160 (setq alist (cdr alist))))
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161 (when codesys
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162 (if (functionp codesys)
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163 (setq codesys (funcall codesys 'insert-file-contents filename))
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164 )
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165 (cond ((consp codesys) (find-coding-system (car codesys)))
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166 ((find-coding-system codesys))
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167 ))))
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168
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169 (define-obsolete-function-alias
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170 'find-file-coding-system-from-filename
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171 'find-file-coding-system-for-read-from-filename)
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172
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173 (defun find-file-coding-system-for-write-from-filename (filename)
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174 "Look up coding system to write a file in `file-coding-system-alist'.
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175 The return value will be nil (no applicable entry) or a coding system
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176 object (the entry specified a coding system)."
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177 (let ((alist file-coding-system-alist)
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178 (found nil)
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179 (codesys nil))
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180 (let ((case-fold-search (eq system-type 'vax-vms)))
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181 (setq filename (file-name-sans-versions filename))
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182 (while (and (not found) alist)
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183 (if (string-match (car (car alist)) filename)
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184 (setq codesys (cdr (car alist))
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185 found t))
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186 (setq alist (cdr alist))))
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187 (when codesys
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188 (if (functionp codesys)
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189 (setq codesys (funcall codesys 'write-region filename))
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190 )
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191 (cond ((consp codesys) (find-coding-system (cdr codesys)))
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192 ((find-coding-system codesys))
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193 ))))
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194
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195 (defun convert-mbox-coding-system (filename visit start end)
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196 "Decoding function for Unix mailboxes.
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197 Does separate detection and decoding on each message, since each
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198 message might be in a different encoding."
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199 (let ((buffer-read-only nil))
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200 (save-restriction
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201 (narrow-to-region start end)
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202 (goto-char (point-min))
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203 (while (not (eobp))
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204 (let ((start (point))
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205 end)
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206 (forward-char 1)
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207 (if (re-search-forward "^From" nil 'move)
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208 (beginning-of-line))
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209 (setq end (point))
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210 (decode-coding-region start end 'undecided))))))
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211
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212 (defun find-coding-system-magic-cookie ()
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213 "Look for the coding-system magic cookie in the current buffer.\n"
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214 "The coding-system magic cookie is the exact string\n"
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215 "\";;;###coding system: \" followed by a valid coding system symbol,\n"
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216 "somewhere within the first 3000 characters of the file. If found,\n"
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217 "the coding system symbol is returned; otherwise nil is returned.\n"
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218 "Note that it is extremely unlikely that such a string would occur\n"
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219 "coincidentally as the result of encoding some characters in a non-ASCII\n"
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220 "charset, and that the spaces make it even less likely since the space\n"
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221 "character is not a valid octet in any ISO 2022 encoding of most non-ASCII\n"
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222 "charsets."
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223 (save-excursion
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224 (goto-char (point-min))
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225 (or (and (looking-at
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226 "^[^\n]*-\\*-[^\n]*coding: \\([^ \t\n;]+\\)[^\n]*-\\*-")
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227 (let ((codesys (intern (buffer-substring
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228 (match-beginning 1)(match-end 1)))))
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229 (if (find-coding-system codesys) codesys)))
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230 ;; (save-excursion
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231 ;; (let (start end)
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232 ;; (and (re-search-forward "^;+[ \t]*Local Variables:" nil t)
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233 ;; (setq start (match-end 0))
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234 ;; (re-search-forward "\n;+[ \t]*End:")
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235 ;; (setq end (match-beginning 0))
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236 ;; (save-restriction
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237 ;; (narrow-to-region start end)
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238 ;; (goto-char start)
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239 ;; (re-search-forward "^;;; coding: \\([^\n]+\\)$" nil t)
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240 ;; )
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241 ;; (let ((codesys
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242 ;; (intern (buffer-substring
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243 ;; (match-beginning 1)(match-end 1)))))
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244 ;; (if (find-coding-system codesys) codesys))
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245 ;; )))
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246 (let ((case-fold-search nil))
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247 (if (search-forward
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248 ";;;###coding system: " (+ (point-min) 3000) t)
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249 (let ((start (point))
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250 (end (progn
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251 (skip-chars-forward "^ \t\n\r")
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252 (point))))
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253 (if (> end start)
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254 (let ((codesys (intern (buffer-substring start end))))
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255 (if (find-coding-system codesys) codesys)))
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256 )))
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257 )))
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258
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259 (defun load (file &optional noerror nomessage nosuffix)
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260 "Execute a file of Lisp code named FILE.
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261 First tries FILE with .elc appended, then tries with .el,
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262 then tries FILE unmodified. Searches directories in load-path.
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263 If optional second arg NOERROR is non-nil,
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264 report no error if FILE doesn't exist.
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265 Print messages at start and end of loading unless
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266 optional third arg NOMESSAGE is non-nil.
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267 If optional fourth arg NOSUFFIX is non-nil, don't try adding
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268 suffixes .elc or .el to the specified name FILE.
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269 Return t if file exists."
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270 (let* ((filename (substitute-in-file-name file))
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271 (handler (find-file-name-handler filename 'load))
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272 (path nil))
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273 (if handler
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274 (funcall handler 'load filename noerror nomessage nosuffix)
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275 (if (or (<= (length filename) 0)
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276 (null (setq path
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277 (locate-file filename load-path
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278 (and (not nosuffix) ".elc:.el:")))))
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279 (and (null noerror)
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280 (signal 'file-error (list "Cannot open load file" filename)))
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281 ;; now use the internal load to actually load the file.
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282 (load-internal
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283 file noerror nomessage nosuffix
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284 (let ((elc ; use string= instead of string-match to keep match-data.
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285 (string= ".elc" (downcase (substring path -4)))))
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286 (or (and (not elc) coding-system-for-read) ; prefer for source file
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287 ;; find magic-cookie
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288 (save-excursion
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289 (set-buffer (get-buffer-create " *load*"))
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290 (erase-buffer)
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291 (let ((coding-system-for-read 'no-conversion))
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292 (insert-file-contents path nil 1 3001))
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293 (find-coding-system-magic-cookie))
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294 (if elc
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295 ;; if reading a byte-compiled file and we didn't find
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296 ;; a coding-system magic cookie, then use `binary'.
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297 ;; We need to guarantee that we never do autodetection
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298 ;; on byte-compiled files because confusion here would
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299 ;; be a very bad thing. Pre-existing byte-compiled
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300 ;; files are always in the `binary' coding system.
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301 ;; Also, byte-compiled files always use `lf' to terminate
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302 ;; a line; don't risk confusion here either.
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303 'binary
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304 (or (find-file-coding-system-for-read-from-filename path)
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305 ;; looking up in `file-coding-system-alist'.
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306 ;; otherwise use `buffer-file-coding-system-for-read',
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307 ;; as normal
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308 buffer-file-coding-system-for-read)
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309 )))
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310 )))))
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311
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312 (defvar insert-file-contents-access-hook nil
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313 "A hook to make a file accessible before reading it.
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314 `insert-file-contents' calls this hook before doing anything else.
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315 Called with two arguments: FILENAME and VISIT, the same as the
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316 corresponding arguments in the call to `insert-file-contents'.")
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317
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318 (defvar insert-file-contents-pre-hook nil
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319 "A special hook to decide the coding system used for reading in a file.
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320
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321 Before reading a file, `insert-file-contents' calls the functions on
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322 this hook with arguments FILENAME and VISIT, the same as the
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323 corresponding arguments in the call to `insert-file-contents'. In
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324 these functions, you may refer to the global variable
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325 `buffer-file-coding-system-for-read'.
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326
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327 The return value of the functions should be either
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328
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329 -- nil
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330 -- A coding system or a symbol denoting it, indicating the coding system
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331 to be used for reading the file
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332 -- A list of two elements (absolute pathname and length of data inserted),
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333 which is used as the return value to `insert-file-contents'. In this
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334 case, `insert-file-contents' assumes that the function has inserted
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335 the file for itself and suppresses further reading.
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336
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337 If any function returns non-nil, the remaining functions are not called.")
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338
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339 (defvar insert-file-contents-error-hook nil
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340 "A hook to set `buffer-file-coding-system' when a read error has occurred.
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341
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342 When a file error (e.g. nonexistent file) occurs while read a file,
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343 `insert-file-contents' calls the functions on this hook with three
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344 arguments: FILENAME and VISIT (the same as the corresponding arguments
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345 in the call to `insert-file-contents') and a cons (SIGNALED-CONDITIONS
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346 . SIGNAL-DATA).
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347
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348 After calling this hook, the error is signalled for real and
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349 propagates to the caller of `insert-file-contents'.")
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350
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351 (defvar insert-file-contents-post-hook nil
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352 "A hook to set `buffer-file-coding-system' for the current buffer.
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353
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354 After successful reading, `insert-file-contents' calls the functions
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355 on this hook with four arguments: FILENAME and VISIT (the same as the
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356 corresponding arguments in the call to `insert-file-contents'),
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357 CODING-SYSTEM (the actual coding system used to decode the file), and
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358 a cons of absolute pathname and length of data inserted (the same
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359 thing as will be returned from `insert-file-contents').")
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360
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361 (defun insert-file-contents (filename &optional visit beg end replace)
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362 "Insert contents of file FILENAME after point.
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363 Returns list of absolute file name and length of data inserted.
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364 If second argument VISIT is non-nil, the buffer's visited filename
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365 and last save file modtime are set, and it is marked unmodified.
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366 If visiting and the file does not exist, visiting is completed
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367 before the error is signaled.
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368
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369 The optional third and fourth arguments BEG and END
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370 specify what portion of the file to insert.
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371 If VISIT is non-nil, BEG and END must be nil.
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372 If optional fifth argument REPLACE is non-nil,
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373 it means replace the current buffer contents (in the accessible portion)
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374 with the file contents. This is better than simply deleting and inserting
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375 the whole thing because (1) it preserves some marker positions
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376 and (2) it puts less data in the undo list.
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377
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378 NOTE: When Mule support is enabled, the REPLACE argument is
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379 currently ignored.
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380
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381 The coding system used for decoding the file is determined as follows:
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382
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383 1. `coding-system-for-read', if non-nil.
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384 2. The result of `insert-file-contents-pre-hook', if non-nil.
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385 3. The matching value for this filename from
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386 `file-coding-system-alist', if any.
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387 4. `buffer-file-coding-system-for-read', if non-nil.
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388 5. The coding system 'no-conversion.
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389
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390 If a local value for `buffer-file-coding-system' in the current buffer
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391 does not exist, it is set to the coding system which was actually used
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392 for reading.
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393
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394 See also `insert-file-contents-access-hook',
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395 `insert-file-contents-pre-hook', `insert-file-contents-error-hook',
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396 and `insert-file-contents-post-hook'."
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397 (let (return-val coding-system used-codesys conversion-func)
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398 ;; OK, first load the file.
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399 (condition-case err
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400 (progn
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401 (run-hook-with-args 'insert-file-contents-access-hook
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402 filename visit)
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403 ;; determine the coding system to use, as described above.
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404 (setq coding-system
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405 (or
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406 ;; #1.
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407 coding-system-for-read
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408 ;; #2.
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409 (run-special-hook-with-args 'insert-file-contents-pre-hook
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410 filename visit)
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411 ;; #3.
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412 (find-file-coding-system-for-read-from-filename filename)
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413 ;; #4.
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414 buffer-file-coding-system-for-read
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415 ;; #5.
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416 'no-conversion))
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417 (if (consp coding-system)
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418 (setq return-val coding-system)
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419 (if (null (find-coding-system coding-system))
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420 (progn
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421 (message
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422 "Invalid coding-system (%s), using 'undecided"
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423 coding-system)
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424 (setq coding-system 'undecided)))
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425 (setq return-val
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426 (insert-file-contents-internal filename visit beg end
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427 replace coding-system
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428 ;; store here!
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429 'used-codesys))
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430 ))
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431 (file-error
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432 (run-hook-with-args 'insert-file-contents-error-hook
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433 filename visit err)
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434 (signal (car err) (cdr err))))
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435 (setq coding-system used-codesys)
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436 ;; call any `post-read-conversion' for the coding system that
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437 ;; was used ...
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438 (let ((func
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439 (coding-system-property coding-system 'post-read-conversion))
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440 (endmark (make-marker)))
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441 (set-marker endmark (+ (point) (nth 1 return-val)))
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442 (if func
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443 (unwind-protect
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444 (save-excursion
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445 (let (buffer-read-only)
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446 (funcall func (point) (marker-position endmark))))
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447 (if visit
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448 (progn
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449 (set-buffer-auto-saved)
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450 (set-buffer-modified-p nil)))))
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451 (setcar (cdr return-val) (- (marker-position endmark) (point))))
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452 ;; now finally set the buffer's `buffer-file-coding-system'.
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453 (if (run-special-hook-with-args 'insert-file-contents-post-hook
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454 filename visit return-val)
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455 nil
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456 (if (local-variable-p 'buffer-file-coding-system (current-buffer))
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457 ;; if buffer-file-coding-system is already local, just
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458 ;; set its eol type to what was found, if it wasn't
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459 ;; set already.
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460 (set-buffer-file-coding-system
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461 (subsidiary-coding-system buffer-file-coding-system
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462 (coding-system-eol-type coding-system)))
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463 ;; otherwise actually set buffer-file-coding-system.
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464 (set-buffer-file-coding-system coding-system)))
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465 return-val))
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466
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467 (defvar write-region-pre-hook nil
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468 "A special hook to decide the coding system used for writing out a file.
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469
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470 Before writing a file, `write-region' calls the functions on this hook
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471 with arguments START, END, FILENAME, APPEND, VISIT, and CODING-SYSTEM,
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472 the same as the corresponding arguments in the call to
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473 `write-region'.
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474
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475 The return value of the functions should be either
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476
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477 -- nil
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478 -- A coding system or a symbol denoting it, indicating the coding system
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479 to be used for reading the file
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480 -- A list of two elements (absolute pathname and length of data written),
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481 which is used as the return value to `write-region'. In this
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482 case, `write-region' assumes that the function has written
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483 the file for itself and suppresses further writing.
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484
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485 If any function returns non-nil, the remaining functions are not called.")
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486
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487 (defvar write-region-post-hook nil
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488 "A hook called by `write-region' after a file has been written out.
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489
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490 The functions on this hook are called with arguments START, END,
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491 FILENAME, APPEND, VISIT, and CODING-SYSTEM, the same as the
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492 corresponding arguments in the call to `write-region'.")
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493
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494 (defun write-region (start end filename &optional append visit lockname coding-system)
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495 "Write current region into specified file.
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496 By default the file's existing contents are replaced by the specified region.
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497 When called from a program, takes three arguments:
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498 START, END and FILENAME. START and END are buffer positions.
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499 Optional fourth argument APPEND if non-nil means
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500 append to existing file contents (if any).
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501 Optional fifth argument VISIT if t means
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502 set last-save-file-modtime of buffer to this file's modtime
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503 and mark buffer not modified.
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504 If VISIT is a string, it is a second file name;
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505 the output goes to FILENAME, but the buffer is marked as visiting VISIT.
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506 VISIT is also the file name to lock and unlock for clash detection.
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507 If VISIT is neither t nor nil nor a string,
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508 that means do not print the \"Wrote file\" message.
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509 The optional sixth arg LOCKNAME, if non-nil, specifies the name to
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510 use for locking and unlocking, overriding FILENAME and VISIT.
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511 Kludgy feature: if START is a string, then that string is written
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512 to the file, instead of any buffer contents, and END is ignored.
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513 Optional seventh argument CODING-SYSTEM specifies the coding system
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514 used to encode the text when it is written out, and defaults to
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515 the value of `buffer-file-coding-system' in the current buffer.
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516 Interactively, with a prefix arg, you will be prompted for the
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517 coding system.
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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-special-hook-with-args
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523 'write-region-pre-hook start end filename append visit lockname)
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524 coding-system
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525 buffer-file-coding-system
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526 (find-file-coding-system-for-write-from-filename filename)
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527 ))
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528 (if (consp coding-system)
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529 coding-system
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530 (let ((func
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531 (coding-system-property coding-system 'pre-write-conversion)))
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532 (if func
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533 (let ((curbuf (current-buffer))
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534 (tempbuf (generate-new-buffer " *temp-write-buffer*"))
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535 (modif (buffer-modified-p)))
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536 (unwind-protect
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537 (save-excursion
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538 (set-buffer tempbuf)
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539 (erase-buffer)
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540 (insert-buffer-substring curbuf start end)
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541 (funcall func (point-min) (point-max))
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542 (write-region-internal (point-min) (point-max) filename
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543 append
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544 (if (eq visit t) nil visit)
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545 lockname
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546 coding-system))
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547 ;; leaving a buffer associated with file will cause problems
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548 ;; when next visiting.
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549 (kill-buffer tempbuf)
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550 (if (or visit (null modif))
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551 (progn
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552 (set-buffer-auto-saved)
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553 (set-buffer-modified-p nil)
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554 (if (buffer-file-name) (set-visited-file-modtime))))))
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555 (write-region-internal start end filename append visit lockname
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556 coding-system)))
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557 (run-hook-with-args 'write-region-post-hook
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558 start end filename append visit lockname
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559 coding-system)))
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560
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561 ;;; mule-files.el ends here
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