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1 ;;; jka-compr.el --- reading/writing/loading compressed files
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2
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3 ;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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4
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5 ;; Author: jka@ece.cmu.edu (Jay K. Adams)
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6 ;; Keywords: data
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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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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;; Synched up with: FSF 19.34
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26
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27 ;;; Commentary:
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28
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29 ;; This package implements low-level support for reading, writing,
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30 ;; and loading compressed files. It hooks into the low-level file
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31 ;; I/O functions (including write-region and insert-file-contents) so
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32 ;; that they automatically compress or uncompress a file if the file
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33 ;; appears to need it (based on the extension of the file name).
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34 ;; Packages like Rmail, VM, GNUS, and Info should be able to work
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35 ;; with compressed files without modification.
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36
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37
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38 ;; INSTRUCTIONS:
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39 ;;
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40 ;; To use jka-compr, simply load this package, and edit as usual.
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41 ;; Its operation should be transparent to the user (except for
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42 ;; messages appearing when a file is being compressed or
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43 ;; uncompressed).
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44 ;;
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45 ;; The variable, jka-compr-compression-info-list can be used to
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46 ;; customize jka-compr to work with other compression programs.
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47 ;; The default value of this variable allows jka-compr to work with
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48 ;; Unix compress and gzip.
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49 ;;
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50 ;; If you are concerned about the stderr output of gzip and other
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51 ;; compression/decompression programs showing up in your buffers, you
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52 ;; should set the discard-error flag in the compression-info-list.
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53 ;; This will cause the stderr of all programs to be discarded.
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54 ;; However, it also causes emacs to call compression/uncompression
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55 ;; programs through a shell (which is specified by jka-compr-shell).
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56 ;; This may be a drag if, on your system, starting up a shell is
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57 ;; slow.
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58 ;;
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59 ;; If you don't want messages about compressing and decompressing
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60 ;; to show up in the echo area, you can set the compress-name and
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61 ;; decompress-name fields of the jka-compr-compression-info-list to
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62 ;; nil.
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63
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64
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65 ;; APPLICATION NOTES:
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66 ;;
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67 ;; crypt++
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68 ;; jka-compr can coexist with crypt++ if you take all the decompression
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69 ;; entries out of the crypt-encoding-list. Clearly problems will arise if
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70 ;; you have two programs trying to compress/decompress files. jka-compr
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71 ;; will not "work with" crypt++ in the following sense: you won't be able to
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72 ;; decode encrypted compressed files--that is, files that have been
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73 ;; compressed then encrypted (in that order). Theoretically, crypt++ and
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74 ;; jka-compr could properly handle a file that has been encrypted then
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75 ;; compressed, but there is little point in trying to compress an encrypted
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76 ;; file.
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77 ;;
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78
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79
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80 ;; ACKNOWLEDGMENTS
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81 ;;
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82 ;; jka-compr is a V19 adaptation of jka-compr for V18 of Emacs. Many people
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83 ;; have made helpful suggestions, reported bugs, and even fixed bugs in
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84 ;; jka-compr. I recall the following people as being particularly helpful.
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85 ;;
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86 ;; Jean-loup Gailly
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87 ;; David Hughes
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88 ;; Richard Pieri
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89 ;; Daniel Quinlan
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90 ;; Chris P. Ross
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91 ;; Rick Sladkey
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92 ;;
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93 ;; Andy Norman's ange-ftp was the inspiration for the original jka-compr for
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94 ;; Version 18 of Emacs.
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95 ;;
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96 ;; After I had made progress on the original jka-compr for V18, I learned of a
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97 ;; package written by Kazushi Jam Marukawa, called jam-zcat, that did exactly
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98 ;; what I was trying to do. I looked over the jam-zcat source code and
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99 ;; probably got some ideas from it.
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100 ;;
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101
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102 ;;; Code:
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103
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104 (defvar jka-compr-shell "sh"
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105 "*Shell to be used for calling compression programs.
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106 The value of this variable only matters if you want to discard the
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107 stderr of a compression/decompression program (see the documentation
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108 for `jka-compr-compression-info-list').")
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109
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110
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111 (defvar jka-compr-use-shell t)
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112
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113
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114 ;;; I have this defined so that .Z files are assumed to be in unix
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115 ;;; compress format; and .gz files, in gzip format.
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116 (defvar jka-compr-compression-info-list
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117 ;;[regexp
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118 ;; compr-message compr-prog compr-args
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119 ;; uncomp-message uncomp-prog uncomp-args
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120 ;; can-append auto-mode-flag]
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121 '(["\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'"
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122 "compressing" "compress" ("-c")
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123 "uncompressing" "uncompress" ("-c")
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124 nil t]
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125 ["\\.tgz\\'"
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126 "zipping" "gzip" ("-c" "-q")
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127 "unzipping" "gzip" ("-c" "-q" "-d")
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128 t nil]
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129 ["\\.gz\\(~\\|\\.~[0-9]+~\\)?\\'"
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130 "zipping" "gzip" ("-c" "-q")
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131 "unzipping" "gzip" ("-c" "-q" "-d")
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132 t t])
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133
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134 "List of vectors that describe available compression techniques.
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135 Each element, which describes a compression technique, is a vector of
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136 the form [REGEXP COMPRESS-MSG COMPRESS-PROGRAM COMPRESS-ARGS
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137 UNCOMPRESS-MSG UNCOMPRESS-PROGRAM UNCOMPRESS-ARGS
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138 APPEND-FLAG EXTENSION], where:
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139
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140 regexp is a regexp that matches filenames that are
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141 compressed with this format
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142
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143 compress-msg is the message to issue to the user when doing this
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144 type of compression (nil means no message)
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145
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146 compress-program is a program that performs this compression
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147
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148 compress-args is a list of args to pass to the compress program
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149
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150 uncompress-msg is the message to issue to the user when doing this
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151 type of uncompression (nil means no message)
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152
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153 uncompress-program is a program that performs this compression
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154
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155 uncompress-args is a list of args to pass to the uncompress program
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156
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157 append-flag is non-nil if this compression technique can be
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158 appended
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159
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160 auto-mode flag non-nil means strip the regexp from file names
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161 before attempting to set the mode.
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162
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163 Because of the way `call-process' is defined, discarding the stderr output of
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164 a program adds the overhead of starting a shell each time the program is
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165 invoked.")
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166
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167 (defvar jka-compr-mode-alist-additions
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168 (list (cons "\\.tgz\\'" 'tar-mode))
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169 "A list of pairs to add to auto-mode-alist when jka-compr is installed.")
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170
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171 (defvar jka-compr-file-name-handler-entry
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172 nil
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173 "The entry in `file-name-handler-alist' used by the jka-compr I/O functions.")
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174
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175 ;;; Functions for accessing the return value of jka-compr-get-compression-info
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176 (defun jka-compr-info-regexp (info) (aref info 0))
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177 (defun jka-compr-info-compress-message (info) (aref info 1))
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178 (defun jka-compr-info-compress-program (info) (aref info 2))
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179 (defun jka-compr-info-compress-args (info) (aref info 3))
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180 (defun jka-compr-info-uncompress-message (info) (aref info 4))
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181 (defun jka-compr-info-uncompress-program (info) (aref info 5))
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182 (defun jka-compr-info-uncompress-args (info) (aref info 6))
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183 (defun jka-compr-info-can-append (info) (aref info 7))
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184 (defun jka-compr-info-strip-extension (info) (aref info 8))
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185
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186
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187 (defun jka-compr-get-compression-info (filename)
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188 "Return information about the compression scheme of FILENAME.
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189 The determination as to which compression scheme, if any, to use is
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190 based on the filename itself and `jka-compr-compression-info-list'."
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191 (catch 'compression-info
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192 (let ((case-fold-search nil))
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193 (mapcar
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194 (function (lambda (x)
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195 (and (string-match (jka-compr-info-regexp x) filename)
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196 (throw 'compression-info x))))
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197 jka-compr-compression-info-list)
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198 nil)))
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199
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200
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201 ;; XEmacs change
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202 (define-error 'compression-error "Compression error" 'file-error)
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203
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204 (defvar jka-compr-acceptable-retval-list '(0 2 141))
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205
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206
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207 (defun jka-compr-error (prog args infile message &optional errfile)
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208
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209 (let ((errbuf (get-buffer-create " *jka-compr-error*"))
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210 (curbuf (current-buffer)))
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211 (set-buffer errbuf)
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212 (widen) (erase-buffer)
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213 (insert (format "Error while executing \"%s %s < %s\"\n\n"
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214 prog
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215 (mapconcat 'identity args " ")
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216 infile))
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217
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218 (and errfile
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219 (insert-file-contents errfile))
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220
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221 (set-buffer curbuf)
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222 (display-buffer errbuf))
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223
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224 (signal 'compression-error (list "Opening input file" (format "error %s" message) infile)))
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225
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226
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227 (defvar jka-compr-dd-program
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228 "/bin/dd")
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229
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230
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231 (defvar jka-compr-dd-blocksize 256)
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232
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233
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234 (defun jka-compr-partial-uncompress (prog message args infile beg len)
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235 "Call program PROG with ARGS args taking input from INFILE.
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236 Fourth and fifth args, BEG and LEN, specify which part of the output
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237 to keep: LEN chars starting BEG chars from the beginning."
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238 (let* ((skip (/ beg jka-compr-dd-blocksize))
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239 (prefix (- beg (* skip jka-compr-dd-blocksize)))
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240 (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize))))
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241 (start (point))
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242 (err-file (jka-compr-make-temp-name))
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243 (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null"
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244 prog
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245 (mapconcat 'identity args " ")
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246 err-file
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247 jka-compr-dd-program
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248 jka-compr-dd-blocksize
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249 skip
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250 ;; dd seems to be unreliable about
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251 ;; providing the last block. So, always
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252 ;; read one more than you think you need.
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253 (if count (concat "count=" (1+ count)) ""))))
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254
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255 (unwind-protect
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256 (or (memq (call-process jka-compr-shell
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257 infile t nil "-c"
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258 run-string)
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259 jka-compr-acceptable-retval-list)
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260
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261 (jka-compr-error prog args infile message err-file))
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262
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263 (jka-compr-delete-temp-file err-file))
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264
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265 ;; Delete the stuff after what we want, if there is any.
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266 (and
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267 len
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268 (< (+ start prefix len) (point))
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269 (delete-region (+ start prefix len) (point)))
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270
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271 ;; Delete the stuff before what we want.
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272 (delete-region start (+ start prefix))))
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273
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274
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275 (defun jka-compr-call-process (prog message infile output temp args)
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276 (if jka-compr-use-shell
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277
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278 (let ((err-file (jka-compr-make-temp-name)))
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279
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280 (unwind-protect
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281
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282 (or (memq
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283 (call-process jka-compr-shell infile
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284 (if (stringp output) nil output)
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285 nil
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286 "-c"
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287 (format "%s %s 2> %s %s"
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288 prog
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289 (mapconcat 'identity args " ")
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290 err-file
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291 (if (stringp output)
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292 (concat "> " output)
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293 "")))
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294 jka-compr-acceptable-retval-list)
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295
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296 (jka-compr-error prog args infile message err-file))
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297
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298 (jka-compr-delete-temp-file err-file)))
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299
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300 (or (zerop
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301 (apply 'call-process
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302 prog
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303 infile
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304 (if (stringp output) temp output)
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305 nil
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306 args))
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307 (jka-compr-error prog args infile message))
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308
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309 (and (stringp output)
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310 (let ((cbuf (current-buffer)))
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311 (set-buffer temp)
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312 (write-region (point-min) (point-max) output)
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313 (erase-buffer)
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314 (set-buffer cbuf)))))
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315
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316
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317 ;;; Support for temp files. Much of this was inspired if not lifted
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318 ;;; from ange-ftp.
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319
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320 (defvar jka-compr-temp-name-template
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321 "/tmp/jka-com"
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322 "Prefix added to all temp files created by jka-compr.
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323 There should be no more than seven characters after the final `/'")
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324
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325 (defvar jka-compr-temp-name-table (make-vector 31 nil))
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326
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327 (defun jka-compr-make-temp-name (&optional local-copy)
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328 "This routine will return the name of a new file."
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329 (let* ((lastchar ?a)
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330 (prevchar ?a)
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331 (template (concat jka-compr-temp-name-template "aa"))
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332 (lastpos (1- (length template)))
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333 (not-done t)
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334 file
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335 entry)
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336
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337 (while not-done
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338 (aset template lastpos lastchar)
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339 (setq file (concat (make-temp-name template) "#"))
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340 (setq entry (intern file jka-compr-temp-name-table))
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341 (if (or (get entry 'active)
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342 (file-exists-p file))
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343
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344 (progn
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345 (setq lastchar (1+ lastchar))
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346 (if (> lastchar ?z)
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347 (progn
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348 (setq prevchar (1+ prevchar))
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349 (setq lastchar ?a)
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350 (if (> prevchar ?z)
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351 (error "Can't allocate temp file.")
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352 (aset template (1- lastpos) prevchar)))))
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353
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354 (put entry 'active (not local-copy))
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355 (setq not-done nil)))
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356
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357 file))
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358
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359
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360 (defun jka-compr-delete-temp-file (temp)
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361
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362 (put (intern temp jka-compr-temp-name-table)
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363 'active nil)
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364
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365 (condition-case ()
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366 (delete-file temp)
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367 (error nil)))
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368
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369 ;;; 20.0-b92 change
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370 ;;; Now receives both `lockname' and `codesys' from Fwrite_region_internal
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371 ;;; what makes it compatible with write-region
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372 (defun jka-compr-write-region (start end file &optional append visit lockname coding-system)
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373 (let* ((filename (expand-file-name file))
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374 (visit-file (if (stringp visit) (expand-file-name visit) filename))
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375 (info (jka-compr-get-compression-info visit-file)))
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376
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377 (if info
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378
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379 (let ((can-append (jka-compr-info-can-append info))
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380 (compress-program (jka-compr-info-compress-program info))
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381 (compress-message (jka-compr-info-compress-message info))
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382 (uncompress-program (jka-compr-info-uncompress-program info))
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383 (uncompress-message (jka-compr-info-uncompress-message info))
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384 (compress-args (jka-compr-info-compress-args info))
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385 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
386 (base-name (file-name-nondirectory visit-file))
|
|
|
387 temp-file cbuf temp-buffer)
|
|
|
388
|
|
|
389 (setq cbuf (current-buffer)
|
|
|
390 temp-buffer (get-buffer-create " *jka-compr-wr-temp*"))
|
|
|
391 (set-buffer temp-buffer)
|
|
|
392 (widen) (erase-buffer)
|
|
|
393 (set-buffer cbuf)
|
|
|
394
|
|
|
395 (if (and append
|
|
|
396 (not can-append)
|
|
|
397 (file-exists-p filename))
|
|
|
398
|
|
|
399 (let* ((local-copy (file-local-copy filename))
|
|
|
400 (local-file (or local-copy filename)))
|
|
|
401
|
|
|
402 (setq temp-file local-file))
|
|
|
403
|
|
|
404 (setq temp-file (jka-compr-make-temp-name)))
|
|
|
405
|
|
|
406 (and
|
|
|
407 compress-message
|
|
|
408 (message "%s %s..." compress-message base-name))
|
|
|
409
|
|
|
410 (jka-compr-run-real-handler 'write-region
|
|
86
|
411 (list start end temp-file t 'dont lockname coding-system))
|
|
0
|
412
|
|
|
413 (jka-compr-call-process compress-program
|
|
|
414 (concat compress-message
|
|
|
415 " " base-name)
|
|
|
416 temp-file
|
|
|
417 temp-buffer
|
|
|
418 nil
|
|
|
419 compress-args)
|
|
|
420
|
|
|
421 (set-buffer temp-buffer)
|
|
|
422 (jka-compr-run-real-handler 'write-region
|
|
|
423 (list (point-min) (point-max)
|
|
|
424 filename
|
|
86
|
425 (and append can-append) 'dont lockname coding-system))
|
|
0
|
426 (erase-buffer)
|
|
|
427 (set-buffer cbuf)
|
|
|
428
|
|
|
429 (jka-compr-delete-temp-file temp-file)
|
|
|
430
|
|
|
431 (and
|
|
|
432 compress-message
|
|
|
433 (message "%s %s...done" compress-message base-name))
|
|
|
434
|
|
|
435 (cond
|
|
|
436 ((eq visit t)
|
|
|
437 (setq buffer-file-name filename)
|
|
|
438 (set-visited-file-modtime))
|
|
|
439 ((stringp visit)
|
|
|
440 (setq buffer-file-name visit)
|
|
|
441 (let ((buffer-file-name filename))
|
|
|
442 (set-visited-file-modtime))))
|
|
|
443
|
|
|
444 (and (or (eq visit t)
|
|
|
445 (eq visit nil)
|
|
|
446 (stringp visit))
|
|
|
447 (message "Wrote %s" visit-file))
|
|
|
448
|
|
|
449 nil)
|
|
|
450
|
|
|
451 (jka-compr-run-real-handler 'write-region
|
|
86
|
452 (list start end filename append visit lockname coding-system)))))
|
|
0
|
453
|
|
|
454
|
|
|
455 (defun jka-compr-insert-file-contents (file &optional visit beg end replace)
|
|
|
456 (barf-if-buffer-read-only)
|
|
|
457
|
|
|
458 (and (or beg end)
|
|
|
459 visit
|
|
|
460 (error "Attempt to visit less than an entire file"))
|
|
|
461
|
|
|
462 (let* ((filename (expand-file-name file))
|
|
|
463 (info (jka-compr-get-compression-info filename)))
|
|
|
464
|
|
|
465 (if info
|
|
|
466
|
|
|
467 (let ((uncompress-message (jka-compr-info-uncompress-message info))
|
|
|
468 (uncompress-program (jka-compr-info-uncompress-program info))
|
|
|
469 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
470 (base-name (file-name-nondirectory filename))
|
|
|
471 (notfound nil)
|
|
|
472 (local-copy
|
|
|
473 (jka-compr-run-real-handler 'file-local-copy (list filename)))
|
|
|
474 local-file
|
|
|
475 size start)
|
|
|
476
|
|
|
477 (setq local-file (or local-copy filename))
|
|
|
478
|
|
|
479 (and
|
|
|
480 visit
|
|
|
481 (setq buffer-file-name filename))
|
|
|
482
|
|
|
483 (unwind-protect ; to make sure local-copy gets deleted
|
|
|
484
|
|
|
485 (progn
|
|
|
486
|
|
|
487 (and
|
|
|
488 uncompress-message
|
|
|
489 (message "%s %s..." uncompress-message base-name))
|
|
|
490
|
|
|
491 (condition-case error-code
|
|
|
492
|
|
|
493 (progn
|
|
|
494 (if replace
|
|
|
495 (goto-char (point-min)))
|
|
|
496 (setq start (point))
|
|
|
497 (if (or beg end)
|
|
|
498 (jka-compr-partial-uncompress uncompress-program
|
|
|
499 (concat uncompress-message
|
|
|
500 " " base-name)
|
|
|
501 uncompress-args
|
|
|
502 local-file
|
|
|
503 (or beg 0)
|
|
|
504 (if (and beg end)
|
|
|
505 (- end beg)
|
|
|
506 end))
|
|
2
|
507 ;; If visiting, bind off buffer-file-name so that
|
|
|
508 ;; file-locking will not ask whether we should
|
|
|
509 ;; really edit the buffer.
|
|
|
510 (let ((buffer-file-name
|
|
|
511 (if visit nil buffer-file-name)))
|
|
|
512 (jka-compr-call-process uncompress-program
|
|
|
513 (concat uncompress-message
|
|
|
514 " " base-name)
|
|
|
515 local-file
|
|
|
516 t
|
|
|
517 nil
|
|
|
518 uncompress-args)))
|
|
0
|
519 (setq size (- (point) start))
|
|
|
520 (if replace
|
|
|
521 (let* ((del-beg (point))
|
|
|
522 (del-end (+ del-beg size)))
|
|
|
523 (delete-region del-beg
|
|
|
524 (min del-end (point-max)))))
|
|
|
525 (goto-char start))
|
|
|
526 (error
|
|
|
527 (if (and (eq (car error-code) 'file-error)
|
|
|
528 (eq (nth 3 error-code) local-file))
|
|
|
529 (if visit
|
|
|
530 (setq notfound error-code)
|
|
|
531 (signal 'file-error
|
|
|
532 (cons "Opening input file"
|
|
|
533 (nthcdr 2 error-code))))
|
|
|
534 (signal (car error-code) (cdr error-code))))))
|
|
|
535
|
|
|
536 (and
|
|
|
537 local-copy
|
|
|
538 (file-exists-p local-copy)
|
|
|
539 (delete-file local-copy)))
|
|
|
540
|
|
|
541 (and
|
|
|
542 visit
|
|
|
543 (progn
|
|
|
544 (unlock-buffer)
|
|
|
545 (setq buffer-file-name filename)
|
|
|
546 (set-visited-file-modtime)))
|
|
|
547
|
|
|
548 (and
|
|
|
549 uncompress-message
|
|
|
550 (message "%s %s...done" uncompress-message base-name))
|
|
|
551
|
|
|
552 (and
|
|
|
553 visit
|
|
|
554 notfound
|
|
|
555 (signal 'file-error
|
|
|
556 (cons "Opening input file" (nth 2 notfound))))
|
|
|
557
|
|
|
558 ;; Run the functions that insert-file-contents would.
|
|
|
559 (let ((p after-insert-file-functions)
|
|
|
560 (insval size))
|
|
|
561 (while p
|
|
|
562 (setq insval (funcall (car p) size))
|
|
|
563 (if insval
|
|
|
564 (progn
|
|
|
565 (or (integerp insval)
|
|
|
566 (signal 'wrong-type-argument
|
|
|
567 (list 'integerp insval)))
|
|
|
568 (setq size insval)))
|
|
|
569 (setq p (cdr p))))
|
|
|
570
|
|
|
571 (list filename size))
|
|
|
572
|
|
|
573 (jka-compr-run-real-handler 'insert-file-contents
|
|
|
574 (list file visit beg end replace)))))
|
|
|
575
|
|
|
576
|
|
|
577 (defun jka-compr-file-local-copy (file)
|
|
|
578 (let* ((filename (expand-file-name file))
|
|
|
579 (info (jka-compr-get-compression-info filename)))
|
|
|
580
|
|
|
581 (if info
|
|
|
582
|
|
|
583 (let ((uncompress-message (jka-compr-info-uncompress-message info))
|
|
|
584 (uncompress-program (jka-compr-info-uncompress-program info))
|
|
|
585 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
586 (base-name (file-name-nondirectory filename))
|
|
|
587 (local-copy
|
|
|
588 (jka-compr-run-real-handler 'file-local-copy (list filename)))
|
|
|
589 (temp-file (jka-compr-make-temp-name t))
|
|
|
590 (temp-buffer (get-buffer-create " *jka-compr-flc-temp*"))
|
|
|
591 (notfound nil)
|
|
|
592 (cbuf (current-buffer))
|
|
|
593 local-file)
|
|
|
594
|
|
|
595 (setq local-file (or local-copy filename))
|
|
|
596
|
|
|
597 (unwind-protect
|
|
|
598
|
|
|
599 (progn
|
|
|
600
|
|
|
601 (and
|
|
|
602 uncompress-message
|
|
|
603 (message "%s %s..." uncompress-message base-name))
|
|
|
604
|
|
|
605 (set-buffer temp-buffer)
|
|
|
606
|
|
|
607 (jka-compr-call-process uncompress-program
|
|
|
608 (concat uncompress-message
|
|
|
609 " " base-name)
|
|
|
610 local-file
|
|
|
611 t
|
|
|
612 nil
|
|
|
613 uncompress-args)
|
|
|
614
|
|
|
615 (and
|
|
|
616 uncompress-message
|
|
|
617 (message "%s %s...done" uncompress-message base-name))
|
|
|
618
|
|
|
619 (write-region
|
|
|
620 (point-min) (point-max) temp-file nil 'dont))
|
|
|
621
|
|
|
622 (and
|
|
|
623 local-copy
|
|
|
624 (file-exists-p local-copy)
|
|
|
625 (delete-file local-copy))
|
|
|
626
|
|
|
627 (set-buffer cbuf)
|
|
|
628 (kill-buffer temp-buffer))
|
|
|
629
|
|
|
630 temp-file)
|
|
|
631
|
|
|
632 (jka-compr-run-real-handler 'file-local-copy (list filename)))))
|
|
|
633
|
|
|
634
|
|
|
635 ;;; Support for loading compressed files.
|
|
2
|
636 ;;; XEmacs: autoload this function
|
|
0
|
637 ;;;###autoload
|
|
|
638 (defun jka-compr-load (file &optional noerror nomessage nosuffix)
|
|
|
639 "Documented as original."
|
|
|
640
|
|
|
641 (let* ((local-copy (jka-compr-file-local-copy file))
|
|
|
642 (load-file (or local-copy file)))
|
|
|
643
|
|
|
644 (unwind-protect
|
|
|
645
|
|
|
646 (let (inhibit-file-name-operation
|
|
|
647 inhibit-file-name-handlers)
|
|
|
648 (or nomessage
|
|
|
649 (message "Loading %s..." file))
|
|
|
650
|
|
2
|
651 (let ((load-force-doc-strings t))
|
|
|
652 (load load-file noerror t t))
|
|
0
|
653
|
|
|
654 (or nomessage
|
|
|
655 (message "Loading %s...done." file)))
|
|
|
656
|
|
|
657 (jka-compr-delete-temp-file local-copy))
|
|
|
658
|
|
|
659 t))
|
|
2
|
660
|
|
|
661 (defun jka-compr-byte-compiler-base-file-name (file)
|
|
|
662 (let ((info (jka-compr-get-compression-info file)))
|
|
|
663 (if (and info (jka-compr-info-strip-extension info))
|
|
|
664 (save-match-data
|
|
|
665 (substring file 0 (string-match (jka-compr-info-regexp info) file)))
|
|
|
666 file)))
|
|
0
|
667
|
|
|
668 (put 'write-region 'jka-compr 'jka-compr-write-region)
|
|
|
669 (put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents)
|
|
|
670 (put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy)
|
|
|
671 (put 'load 'jka-compr 'jka-compr-load)
|
|
2
|
672 (put 'byte-compiler-base-file-name 'jka-compr
|
|
|
673 'jka-compr-byte-compiler-base-file-name)
|
|
0
|
674
|
|
|
675 (defun jka-compr-handler (operation &rest args)
|
|
|
676 (save-match-data
|
|
|
677 (let ((jka-op (get operation 'jka-compr)))
|
|
|
678 (if jka-op
|
|
|
679 (apply jka-op args)
|
|
|
680 (jka-compr-run-real-handler operation args)))))
|
|
|
681
|
|
|
682 ;; If we are given an operation that we don't handle,
|
|
|
683 ;; call the Emacs primitive for that operation,
|
|
|
684 ;; and manipulate the inhibit variables
|
|
|
685 ;; to prevent the primitive from calling our handler again.
|
|
|
686 (defun jka-compr-run-real-handler (operation args)
|
|
|
687 (let ((inhibit-file-name-handlers
|
|
|
688 (cons 'jka-compr-handler
|
|
|
689 (and (eq inhibit-file-name-operation operation)
|
|
|
690 inhibit-file-name-handlers)))
|
|
|
691 (inhibit-file-name-operation operation))
|
|
|
692 (apply operation args)))
|
|
|
693
|
|
2
|
694 ;; XEmacs change: I don't have a clue what this is trying do. -sb
|
|
|
695 ;; ;;;###autoload(defun auto-compression-mode (&optional arg)
|
|
|
696 ;; ;;;###autoload "\
|
|
|
697 ;; ;;;###autoloadToggle automatic file compression and uncompression.
|
|
|
698 ;; ;;;###autoloadWith prefix argument ARG, turn auto compression on if positive, else off.
|
|
|
699 ;; ;;;###autoloadReturns the new status of auto compression (non-nil means on)."
|
|
|
700 ;; ;;;###autoload (interactive "P")
|
|
|
701 ;; ;;;###autoload (if (not (fboundp 'jka-compr-installed-p))
|
|
|
702 ;; ;;;###autoload (progn
|
|
|
703 ;; ;;;###autoload (require 'jka-compr)
|
|
|
704 ;; ;;;###autoload ;; That turned the mode on, so make it initially off.
|
|
|
705 ;; ;;;###autoload (toggle-auto-compression)))
|
|
|
706 ;; ;;;###autoload (toggle-auto-compression arg t))
|
|
|
707
|
|
|
708 ;; XEmacs: autoload this function
|
|
0
|
709 ;;;###autoload
|
|
2
|
710 (defun toggle-auto-compression (&optional arg message)
|
|
|
711 "Toggle automatic file compression and uncompression.
|
|
0
|
712 With prefix argument ARG, turn auto compression on if positive, else off.
|
|
2
|
713 Returns the new status of auto compression (non-nil means on).
|
|
|
714 If the argument MESSAGE is non-nil, it means to print a message
|
|
|
715 saying whether the mode is now on or off."
|
|
|
716 (interactive "P\np")
|
|
0
|
717 (let* ((installed (jka-compr-installed-p))
|
|
|
718 (flag (if (null arg)
|
|
|
719 (not installed)
|
|
|
720 (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0))))))
|
|
|
721
|
|
|
722 (cond
|
|
|
723 ((and flag installed) t) ; already installed
|
|
|
724
|
|
|
725 ((and (not flag) (not installed)) nil) ; already not installed
|
|
|
726
|
|
|
727 (flag
|
|
|
728 (jka-compr-install))
|
|
|
729
|
|
|
730 (t
|
|
|
731 (jka-compr-uninstall)))
|
|
|
732
|
|
|
733
|
|
2
|
734 (and message
|
|
0
|
735 (if flag
|
|
|
736 (message "Automatic file (de)compression is now ON.")
|
|
|
737 (message "Automatic file (de)compression is now OFF.")))
|
|
|
738
|
|
|
739 flag))
|
|
|
740
|
|
|
741
|
|
|
742 (defun jka-compr-build-file-regexp ()
|
|
|
743 (concat
|
|
|
744 "\\("
|
|
|
745 (mapconcat
|
|
|
746 'jka-compr-info-regexp
|
|
|
747 jka-compr-compression-info-list
|
|
|
748 "\\)\\|\\(")
|
|
|
749 "\\)"))
|
|
|
750
|
|
|
751 ;;;###autoload
|
|
|
752 (defun jka-compr-install ()
|
|
|
753 "Install jka-compr.
|
|
|
754 This adds entries to `file-name-handler-alist' and `auto-mode-alist'
|
|
|
755 and `inhibit-first-line-modes-suffixes'."
|
|
|
756
|
|
|
757 (setq jka-compr-file-name-handler-entry
|
|
|
758 (cons (jka-compr-build-file-regexp) 'jka-compr-handler))
|
|
|
759
|
|
|
760 (setq file-name-handler-alist (cons jka-compr-file-name-handler-entry
|
|
|
761 file-name-handler-alist))
|
|
|
762
|
|
|
763 (mapcar
|
|
|
764 (function (lambda (x)
|
|
|
765 (and (jka-compr-info-strip-extension x)
|
|
|
766 ;; Make entries in auto-mode-alist so that modes
|
|
|
767 ;; are chosen right according to the file names
|
|
|
768 ;; sans `.gz'.
|
|
|
769 (setq auto-mode-alist
|
|
|
770 (cons (list (jka-compr-info-regexp x)
|
|
|
771 nil 'jka-compr)
|
|
|
772 auto-mode-alist))
|
|
|
773 ;; Also add these regexps to
|
|
|
774 ;; inhibit-first-line-modes-suffixes, so that a
|
|
|
775 ;; -*- line in the first file of a compressed tar
|
|
|
776 ;; file doesn't override tar-mode.
|
|
2
|
777 ;; XEmacs: the (now)superfluous conditional doesn't hurt
|
|
0
|
778 (and (boundp 'inhibit-first-line-modes-suffixes)
|
|
|
779 (setq inhibit-first-line-modes-suffixes
|
|
|
780 (cons (jka-compr-info-regexp x)
|
|
|
781 inhibit-first-line-modes-suffixes))))))
|
|
|
782 jka-compr-compression-info-list)
|
|
|
783 (setq auto-mode-alist
|
|
|
784 (append auto-mode-alist jka-compr-mode-alist-additions)))
|
|
|
785
|
|
|
786
|
|
|
787 (defun jka-compr-uninstall ()
|
|
|
788 "Uninstall jka-compr.
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789 This removes the entries in `file-name-handler-alist' and `auto-mode-alist'
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790 and `inhibit-first-line-modes-suffixes' that were added
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|
791 by `jka-compr-installed'."
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792 ;; Delete from inhibit-first-line-modes-suffixes
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|
793 ;; what jka-compr-install added.
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|
794 (mapcar
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|
|
795 (function (lambda (x)
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|
796 (and (jka-compr-info-strip-extension x)
|
|
2
|
797 ;; XEmacs: the (now)superfluous conditional doesn't hurt
|
|
0
|
798 (and (boundp 'inhibit-first-line-modes-suffixes)
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|
|
799 (setq inhibit-first-line-modes-suffixes
|
|
|
800 (delete (jka-compr-info-regexp x)
|
|
|
801 inhibit-first-line-modes-suffixes)))))
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|
802 )
|
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|
803 jka-compr-compression-info-list)
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|
804
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805 (let* ((fnha (cons nil file-name-handler-alist))
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806 (last fnha))
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|
|
807
|
|
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808 (while (cdr last)
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|
|
809 (if (eq (cdr (car (cdr last))) 'jka-compr-handler)
|
|
|
810 (setcdr last (cdr (cdr last)))
|
|
|
811 (setq last (cdr last))))
|
|
|
812
|
|
|
813 (setq file-name-handler-alist (cdr fnha)))
|
|
|
814
|
|
|
815 (let* ((ama (cons nil auto-mode-alist))
|
|
|
816 (last ama)
|
|
|
817 entry)
|
|
|
818
|
|
|
819 (while (cdr last)
|
|
|
820 (setq entry (car (cdr last)))
|
|
|
821 (if (or (member entry jka-compr-mode-alist-additions)
|
|
|
822 (and (consp (cdr entry))
|
|
|
823 (eq (nth 2 entry) 'jka-compr)))
|
|
|
824 (setcdr last (cdr (cdr last)))
|
|
|
825 (setq last (cdr last))))
|
|
|
826
|
|
|
827 (setq auto-mode-alist (cdr ama))))
|
|
|
828
|
|
|
829
|
|
|
830 (defun jka-compr-installed-p ()
|
|
|
831 "Return non-nil if jka-compr is installed.
|
|
|
832 The return value is the entry in `file-name-handler-alist' for jka-compr."
|
|
70
|
833
|
|
|
834 (let ((fnha file-name-handler-alist)
|
|
|
835 (installed nil))
|
|
|
836
|
|
|
837 (while (and fnha (not installed))
|
|
|
838 (and (eq (cdr (car fnha)) 'jka-compr-handler)
|
|
|
839 (setq installed (car fnha)))
|
|
|
840 (setq fnha (cdr fnha)))
|
|
|
841
|
|
|
842 installed))
|
|
0
|
843
|
|
|
844
|
|
|
845 ;;; Add the file I/O hook if it does not already exist.
|
|
|
846 ;;; Make sure that jka-compr-file-name-handler-entry is eq to the
|
|
|
847 ;;; entry for jka-compr in file-name-handler-alist.
|
|
|
848 (and (jka-compr-installed-p)
|
|
|
849 (jka-compr-uninstall))
|
|
|
850
|
|
|
851 (jka-compr-install)
|
|
|
852
|
|
|
853
|
|
|
854 (provide 'jka-compr)
|
|
|
855
|
|
|
856 ;; jka-compr.el ends here.
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