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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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120
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104 (defgroup compression nil
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105 "Data compression utilities"
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106 :group 'data)
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107
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142
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108 (progn
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109 (defgroup jka-compr nil
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110 "jka-compr customization"
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111 :group 'compression)
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112 )
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120
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113
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114
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115 (defcustom jka-compr-shell "sh"
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116 "*Shell to be used for calling compression programs.
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117 The value of this variable only matters if you want to discard the
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118 stderr of a compression/decompression program (see the documentation
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120
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119 for `jka-compr-compression-info-list')."
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120 :type 'string
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121 :group 'jka-compr)
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122
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123 (defvar jka-compr-use-shell t)
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124
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125
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126 ;;; I have this defined so that .Z files are assumed to be in unix
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127 ;;; compress format; and .gz files, in gzip format.
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120
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128 (defcustom jka-compr-compression-info-list
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129 ;;[regexp
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130 ;; compr-message compr-prog compr-args
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131 ;; uncomp-message uncomp-prog uncomp-args
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132 ;; can-append auto-mode-flag]
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133 '(["\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'"
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134 "compressing" "compress" ("-c")
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135 "uncompressing" "uncompress" ("-c")
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136 nil t]
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137 ["\\.tgz\\'"
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138 "zipping" "gzip" ("-c" "-q")
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139 "unzipping" "gzip" ("-c" "-q" "-d")
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140 t nil]
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141 ["\\.gz\\(~\\|\\.~[0-9]+~\\)?\\'"
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142 "zipping" "gzip" ("-c" "-q")
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143 "unzipping" "gzip" ("-c" "-q" "-d")
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144 t t])
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145
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146 "List of vectors that describe available compression techniques.
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147 Each element, which describes a compression technique, is a vector of
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148 the form [REGEXP COMPRESS-MSG COMPRESS-PROGRAM COMPRESS-ARGS
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149 UNCOMPRESS-MSG UNCOMPRESS-PROGRAM UNCOMPRESS-ARGS
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150 APPEND-FLAG EXTENSION], where:
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151
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152 regexp is a regexp that matches filenames that are
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153 compressed with this format
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154
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155 compress-msg is the message to issue to the user when doing this
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156 type of compression (nil means no message)
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157
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158 compress-program is a program that performs this compression
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159
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160 compress-args is a list of args to pass to the compress program
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161
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162 uncompress-msg is the message to issue to the user when doing this
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163 type of uncompression (nil means no message)
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164
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165 uncompress-program is a program that performs this compression
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166
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167 uncompress-args is a list of args to pass to the uncompress program
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168
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169 append-flag is non-nil if this compression technique can be
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170 appended
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171
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172 auto-mode flag non-nil means strip the regexp from file names
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173 before attempting to set the mode.
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174
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175 Because of the way `call-process' is defined, discarding the stderr output of
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176 a program adds the overhead of starting a shell each time the program is
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120
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177 invoked."
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178 :type '(repeat (vector regexp
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179 (choice :tag "Compress Message"
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180 (string :format "%v")
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181 (const :tag "No Message" nil))
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182 (string :tag "Compress Program")
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183 (repeat :tag "Compress Arguments" string)
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184 (choice :tag "Uncompress Message"
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185 (string :format "%v")
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186 (const :tag "No Message" nil))
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187 (string :tag "Uncompress Program")
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188 (repeat :tag "Uncompress Arguments" string)
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189 (boolean :tag "Append")
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190 (boolean :tag "Auto Mode")))
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191 :group 'jka-compr)
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192
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193 (defvar jka-compr-mode-alist-additions
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194 (list (cons "\\.tgz\\'" 'tar-mode))
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195 "A list of pairs to add to auto-mode-alist when jka-compr is installed.")
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196
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197 (defvar jka-compr-file-name-handler-entry
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198 nil
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199 "The entry in `file-name-handler-alist' used by the jka-compr I/O functions.")
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200
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201 ;;; Functions for accessing the return value of jka-compr-get-compression-info
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202 (defun jka-compr-info-regexp (info) (aref info 0))
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203 (defun jka-compr-info-compress-message (info) (aref info 1))
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204 (defun jka-compr-info-compress-program (info) (aref info 2))
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205 (defun jka-compr-info-compress-args (info) (aref info 3))
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206 (defun jka-compr-info-uncompress-message (info) (aref info 4))
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207 (defun jka-compr-info-uncompress-program (info) (aref info 5))
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208 (defun jka-compr-info-uncompress-args (info) (aref info 6))
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209 (defun jka-compr-info-can-append (info) (aref info 7))
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210 (defun jka-compr-info-strip-extension (info) (aref info 8))
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211
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212
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213 (defun jka-compr-get-compression-info (filename)
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214 "Return information about the compression scheme of FILENAME.
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215 The determination as to which compression scheme, if any, to use is
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216 based on the filename itself and `jka-compr-compression-info-list'."
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217 (catch 'compression-info
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218 (let ((case-fold-search nil))
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219 (mapcar
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220 (function (lambda (x)
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221 (and (string-match (jka-compr-info-regexp x) filename)
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222 (throw 'compression-info x))))
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223 jka-compr-compression-info-list)
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224 nil)))
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225
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226
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227 ;; XEmacs change
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228 (define-error 'compression-error "Compression error" 'file-error)
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229
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230 (defvar jka-compr-acceptable-retval-list '(0 2 141))
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231
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232
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233 (defun jka-compr-error (prog args infile message &optional errfile)
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234
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235 (let ((errbuf (get-buffer-create " *jka-compr-error*"))
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236 (curbuf (current-buffer)))
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237 (set-buffer errbuf)
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238 (widen) (erase-buffer)
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239 (insert (format "Error while executing \"%s %s < %s\"\n\n"
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240 prog
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241 (mapconcat 'identity args " ")
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242 infile))
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243
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244 (and errfile
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245 (insert-file-contents errfile))
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246
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247 (set-buffer curbuf)
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248 (display-buffer errbuf))
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249
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250 (signal 'compression-error (list "Opening input file" (format "error %s" message) infile)))
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251
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252
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253 (defvar jka-compr-dd-program
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254 "/bin/dd")
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255
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256
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257 (defvar jka-compr-dd-blocksize 256)
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258
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259
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260 (defun jka-compr-partial-uncompress (prog message args infile beg len)
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261 "Call program PROG with ARGS args taking input from INFILE.
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262 Fourth and fifth args, BEG and LEN, specify which part of the output
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263 to keep: LEN chars starting BEG chars from the beginning."
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264 (let* ((skip (/ beg jka-compr-dd-blocksize))
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265 (prefix (- beg (* skip jka-compr-dd-blocksize)))
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266 (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize))))
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267 (start (point))
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268 (err-file (jka-compr-make-temp-name))
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269 (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null"
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270 prog
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271 (mapconcat 'identity args " ")
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272 err-file
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273 jka-compr-dd-program
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274 jka-compr-dd-blocksize
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275 skip
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276 ;; dd seems to be unreliable about
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277 ;; providing the last block. So, always
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278 ;; read one more than you think you need.
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279 (if count (concat "count=" (1+ count)) ""))))
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280
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281 (unwind-protect
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282 (or (memq (call-process jka-compr-shell
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283 infile t nil "-c"
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284 run-string)
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285 jka-compr-acceptable-retval-list)
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286
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287 (jka-compr-error prog args infile message err-file))
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288
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289 (jka-compr-delete-temp-file err-file))
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290
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291 ;; Delete the stuff after what we want, if there is any.
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292 (and
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293 len
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294 (< (+ start prefix len) (point))
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295 (delete-region (+ start prefix len) (point)))
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296
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297 ;; Delete the stuff before what we want.
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298 (delete-region start (+ start prefix))))
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299
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300
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301 (defun jka-compr-call-process (prog message infile output temp args)
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302 (if jka-compr-use-shell
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303
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304 (let ((err-file (jka-compr-make-temp-name)))
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305
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306 (unwind-protect
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307
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308 (or (memq
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309 (call-process jka-compr-shell infile
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310 (if (stringp output) nil output)
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311 nil
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312 "-c"
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313 (format "%s %s 2> %s %s"
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314 prog
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315 (mapconcat 'identity args " ")
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316 err-file
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317 (if (stringp output)
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318 (concat "> " output)
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319 "")))
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320 jka-compr-acceptable-retval-list)
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321
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322 (jka-compr-error prog args infile message err-file))
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323
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324 (jka-compr-delete-temp-file err-file)))
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325
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326 (or (zerop
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327 (apply 'call-process
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328 prog
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329 infile
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330 (if (stringp output) temp output)
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331 nil
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332 args))
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333 (jka-compr-error prog args infile message))
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334
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335 (and (stringp output)
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336 (let ((cbuf (current-buffer)))
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337 (set-buffer temp)
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338 (write-region (point-min) (point-max) output)
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339 (erase-buffer)
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340 (set-buffer cbuf)))))
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341
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342
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343 ;;; Support for temp files. Much of this was inspired if not lifted
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344 ;;; from ange-ftp.
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345
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346 (defcustom jka-compr-temp-name-template
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347 "/tmp/jka-com"
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348 "Prefix added to all temp files created by jka-compr.
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120
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349 There should be no more than seven characters after the final `/'"
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350 :type 'string
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351 :group 'jka-compr)
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352
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353 (defvar jka-compr-temp-name-table (make-vector 31 nil))
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354
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355 (defun jka-compr-make-temp-name (&optional local-copy)
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356 "This routine will return the name of a new file."
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357 (let* ((lastchar ?a)
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358 (prevchar ?a)
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359 (template (concat jka-compr-temp-name-template "aa"))
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360 (lastpos (1- (length template)))
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361 (not-done t)
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362 file
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363 entry)
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364
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365 (while not-done
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366 (aset template lastpos lastchar)
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367 (setq file (concat (make-temp-name template) "#"))
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368 (setq entry (intern file jka-compr-temp-name-table))
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369 (if (or (get entry 'active)
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370 (file-exists-p file))
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371
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372 (progn
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373 (setq lastchar (1+ lastchar))
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374 (if (> lastchar ?z)
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375 (progn
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376 (setq prevchar (1+ prevchar))
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377 (setq lastchar ?a)
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378 (if (> prevchar ?z)
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379 (error "Can't allocate temp file.")
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380 (aset template (1- lastpos) prevchar)))))
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381
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382 (put entry 'active (not local-copy))
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383 (setq not-done nil)))
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384
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385 file))
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386
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387
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388 (defun jka-compr-delete-temp-file (temp)
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389
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|
390 (put (intern temp jka-compr-temp-name-table)
|
|
|
391 'active nil)
|
|
|
392
|
|
|
393 (condition-case ()
|
|
|
394 (delete-file temp)
|
|
|
395 (error nil)))
|
|
|
396
|
|
86
|
397 ;;; 20.0-b92 change
|
|
|
398 ;;; Now receives both `lockname' and `codesys' from Fwrite_region_internal
|
|
|
399 ;;; what makes it compatible with write-region
|
|
|
400 (defun jka-compr-write-region (start end file &optional append visit lockname coding-system)
|
|
0
|
401 (let* ((filename (expand-file-name file))
|
|
|
402 (visit-file (if (stringp visit) (expand-file-name visit) filename))
|
|
|
403 (info (jka-compr-get-compression-info visit-file)))
|
|
|
404
|
|
|
405 (if info
|
|
|
406
|
|
|
407 (let ((can-append (jka-compr-info-can-append info))
|
|
|
408 (compress-program (jka-compr-info-compress-program info))
|
|
|
409 (compress-message (jka-compr-info-compress-message info))
|
|
|
410 (uncompress-program (jka-compr-info-uncompress-program info))
|
|
|
411 (uncompress-message (jka-compr-info-uncompress-message info))
|
|
|
412 (compress-args (jka-compr-info-compress-args info))
|
|
|
413 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
414 (base-name (file-name-nondirectory visit-file))
|
|
|
415 temp-file cbuf temp-buffer)
|
|
|
416
|
|
|
417 (setq cbuf (current-buffer)
|
|
|
418 temp-buffer (get-buffer-create " *jka-compr-wr-temp*"))
|
|
|
419 (set-buffer temp-buffer)
|
|
|
420 (widen) (erase-buffer)
|
|
|
421 (set-buffer cbuf)
|
|
|
422
|
|
|
423 (if (and append
|
|
|
424 (not can-append)
|
|
|
425 (file-exists-p filename))
|
|
|
426
|
|
|
427 (let* ((local-copy (file-local-copy filename))
|
|
|
428 (local-file (or local-copy filename)))
|
|
|
429
|
|
|
430 (setq temp-file local-file))
|
|
|
431
|
|
|
432 (setq temp-file (jka-compr-make-temp-name)))
|
|
|
433
|
|
|
434 (and
|
|
|
435 compress-message
|
|
|
436 (message "%s %s..." compress-message base-name))
|
|
|
437
|
|
|
438 (jka-compr-run-real-handler 'write-region
|
|
86
|
439 (list start end temp-file t 'dont lockname coding-system))
|
|
0
|
440
|
|
|
441 (jka-compr-call-process compress-program
|
|
|
442 (concat compress-message
|
|
|
443 " " base-name)
|
|
|
444 temp-file
|
|
|
445 temp-buffer
|
|
|
446 nil
|
|
|
447 compress-args)
|
|
|
448
|
|
|
449 (set-buffer temp-buffer)
|
|
|
450 (jka-compr-run-real-handler 'write-region
|
|
|
451 (list (point-min) (point-max)
|
|
|
452 filename
|
|
86
|
453 (and append can-append) 'dont lockname coding-system))
|
|
0
|
454 (erase-buffer)
|
|
|
455 (set-buffer cbuf)
|
|
|
456
|
|
|
457 (jka-compr-delete-temp-file temp-file)
|
|
|
458
|
|
|
459 (and
|
|
|
460 compress-message
|
|
|
461 (message "%s %s...done" compress-message base-name))
|
|
|
462
|
|
|
463 (cond
|
|
|
464 ((eq visit t)
|
|
|
465 (setq buffer-file-name filename)
|
|
|
466 (set-visited-file-modtime))
|
|
|
467 ((stringp visit)
|
|
|
468 (setq buffer-file-name visit)
|
|
|
469 (let ((buffer-file-name filename))
|
|
|
470 (set-visited-file-modtime))))
|
|
|
471
|
|
|
472 (and (or (eq visit t)
|
|
|
473 (eq visit nil)
|
|
|
474 (stringp visit))
|
|
|
475 (message "Wrote %s" visit-file))
|
|
|
476
|
|
|
477 nil)
|
|
|
478
|
|
|
479 (jka-compr-run-real-handler 'write-region
|
|
86
|
480 (list start end filename append visit lockname coding-system)))))
|
|
0
|
481
|
|
|
482
|
|
|
483 (defun jka-compr-insert-file-contents (file &optional visit beg end replace)
|
|
|
484 (barf-if-buffer-read-only)
|
|
|
485
|
|
|
486 (and (or beg end)
|
|
|
487 visit
|
|
|
488 (error "Attempt to visit less than an entire file"))
|
|
|
489
|
|
|
490 (let* ((filename (expand-file-name file))
|
|
|
491 (info (jka-compr-get-compression-info filename)))
|
|
|
492
|
|
|
493 (if info
|
|
|
494
|
|
|
495 (let ((uncompress-message (jka-compr-info-uncompress-message info))
|
|
|
496 (uncompress-program (jka-compr-info-uncompress-program info))
|
|
|
497 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
498 (base-name (file-name-nondirectory filename))
|
|
|
499 (notfound nil)
|
|
|
500 (local-copy
|
|
|
501 (jka-compr-run-real-handler 'file-local-copy (list filename)))
|
|
|
502 local-file
|
|
|
503 size start)
|
|
|
504
|
|
|
505 (setq local-file (or local-copy filename))
|
|
|
506
|
|
|
507 (and
|
|
|
508 visit
|
|
|
509 (setq buffer-file-name filename))
|
|
|
510
|
|
|
511 (unwind-protect ; to make sure local-copy gets deleted
|
|
|
512
|
|
|
513 (progn
|
|
|
514
|
|
|
515 (and
|
|
|
516 uncompress-message
|
|
|
517 (message "%s %s..." uncompress-message base-name))
|
|
|
518
|
|
|
519 (condition-case error-code
|
|
|
520
|
|
|
521 (progn
|
|
|
522 (if replace
|
|
|
523 (goto-char (point-min)))
|
|
|
524 (setq start (point))
|
|
|
525 (if (or beg end)
|
|
|
526 (jka-compr-partial-uncompress uncompress-program
|
|
|
527 (concat uncompress-message
|
|
|
528 " " base-name)
|
|
|
529 uncompress-args
|
|
|
530 local-file
|
|
|
531 (or beg 0)
|
|
|
532 (if (and beg end)
|
|
|
533 (- end beg)
|
|
|
534 end))
|
|
2
|
535 ;; If visiting, bind off buffer-file-name so that
|
|
|
536 ;; file-locking will not ask whether we should
|
|
|
537 ;; really edit the buffer.
|
|
|
538 (let ((buffer-file-name
|
|
|
539 (if visit nil buffer-file-name)))
|
|
|
540 (jka-compr-call-process uncompress-program
|
|
|
541 (concat uncompress-message
|
|
|
542 " " base-name)
|
|
|
543 local-file
|
|
|
544 t
|
|
|
545 nil
|
|
|
546 uncompress-args)))
|
|
0
|
547 (setq size (- (point) start))
|
|
|
548 (if replace
|
|
|
549 (let* ((del-beg (point))
|
|
|
550 (del-end (+ del-beg size)))
|
|
|
551 (delete-region del-beg
|
|
|
552 (min del-end (point-max)))))
|
|
|
553 (goto-char start))
|
|
|
554 (error
|
|
|
555 (if (and (eq (car error-code) 'file-error)
|
|
|
556 (eq (nth 3 error-code) local-file))
|
|
|
557 (if visit
|
|
|
558 (setq notfound error-code)
|
|
|
559 (signal 'file-error
|
|
|
560 (cons "Opening input file"
|
|
|
561 (nthcdr 2 error-code))))
|
|
|
562 (signal (car error-code) (cdr error-code))))))
|
|
|
563
|
|
|
564 (and
|
|
|
565 local-copy
|
|
|
566 (file-exists-p local-copy)
|
|
|
567 (delete-file local-copy)))
|
|
|
568
|
|
|
569 (and
|
|
|
570 visit
|
|
|
571 (progn
|
|
|
572 (unlock-buffer)
|
|
|
573 (setq buffer-file-name filename)
|
|
|
574 (set-visited-file-modtime)))
|
|
|
575
|
|
|
576 (and
|
|
|
577 uncompress-message
|
|
|
578 (message "%s %s...done" uncompress-message base-name))
|
|
|
579
|
|
|
580 (and
|
|
|
581 visit
|
|
|
582 notfound
|
|
|
583 (signal 'file-error
|
|
|
584 (cons "Opening input file" (nth 2 notfound))))
|
|
|
585
|
|
|
586 ;; Run the functions that insert-file-contents would.
|
|
|
587 (let ((p after-insert-file-functions)
|
|
|
588 (insval size))
|
|
|
589 (while p
|
|
|
590 (setq insval (funcall (car p) size))
|
|
|
591 (if insval
|
|
|
592 (progn
|
|
|
593 (or (integerp insval)
|
|
|
594 (signal 'wrong-type-argument
|
|
|
595 (list 'integerp insval)))
|
|
|
596 (setq size insval)))
|
|
|
597 (setq p (cdr p))))
|
|
|
598
|
|
|
599 (list filename size))
|
|
|
600
|
|
|
601 (jka-compr-run-real-handler 'insert-file-contents
|
|
|
602 (list file visit beg end replace)))))
|
|
|
603
|
|
|
604
|
|
|
605 (defun jka-compr-file-local-copy (file)
|
|
|
606 (let* ((filename (expand-file-name file))
|
|
|
607 (info (jka-compr-get-compression-info filename)))
|
|
|
608
|
|
|
609 (if info
|
|
|
610
|
|
|
611 (let ((uncompress-message (jka-compr-info-uncompress-message info))
|
|
|
612 (uncompress-program (jka-compr-info-uncompress-program info))
|
|
|
613 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
614 (base-name (file-name-nondirectory filename))
|
|
|
615 (local-copy
|
|
|
616 (jka-compr-run-real-handler 'file-local-copy (list filename)))
|
|
|
617 (temp-file (jka-compr-make-temp-name t))
|
|
|
618 (temp-buffer (get-buffer-create " *jka-compr-flc-temp*"))
|
|
|
619 (notfound nil)
|
|
|
620 (cbuf (current-buffer))
|
|
|
621 local-file)
|
|
|
622
|
|
|
623 (setq local-file (or local-copy filename))
|
|
|
624
|
|
|
625 (unwind-protect
|
|
|
626
|
|
|
627 (progn
|
|
|
628
|
|
|
629 (and
|
|
|
630 uncompress-message
|
|
|
631 (message "%s %s..." uncompress-message base-name))
|
|
|
632
|
|
|
633 (set-buffer temp-buffer)
|
|
|
634
|
|
|
635 (jka-compr-call-process uncompress-program
|
|
|
636 (concat uncompress-message
|
|
|
637 " " base-name)
|
|
|
638 local-file
|
|
|
639 t
|
|
|
640 nil
|
|
|
641 uncompress-args)
|
|
|
642
|
|
|
643 (and
|
|
|
644 uncompress-message
|
|
|
645 (message "%s %s...done" uncompress-message base-name))
|
|
|
646
|
|
|
647 (write-region
|
|
|
648 (point-min) (point-max) temp-file nil 'dont))
|
|
|
649
|
|
|
650 (and
|
|
|
651 local-copy
|
|
|
652 (file-exists-p local-copy)
|
|
|
653 (delete-file local-copy))
|
|
|
654
|
|
|
655 (set-buffer cbuf)
|
|
|
656 (kill-buffer temp-buffer))
|
|
|
657
|
|
|
658 temp-file)
|
|
|
659
|
|
|
660 (jka-compr-run-real-handler 'file-local-copy (list filename)))))
|
|
|
661
|
|
|
662
|
|
|
663 ;;; Support for loading compressed files.
|
|
2
|
664 ;;; XEmacs: autoload this function
|
|
0
|
665 ;;;###autoload
|
|
|
666 (defun jka-compr-load (file &optional noerror nomessage nosuffix)
|
|
|
667 "Documented as original."
|
|
|
668
|
|
|
669 (let* ((local-copy (jka-compr-file-local-copy file))
|
|
|
670 (load-file (or local-copy file)))
|
|
|
671
|
|
|
672 (unwind-protect
|
|
|
673
|
|
|
674 (let (inhibit-file-name-operation
|
|
|
675 inhibit-file-name-handlers)
|
|
|
676 (or nomessage
|
|
|
677 (message "Loading %s..." file))
|
|
|
678
|
|
2
|
679 (let ((load-force-doc-strings t))
|
|
|
680 (load load-file noerror t t))
|
|
0
|
681
|
|
|
682 (or nomessage
|
|
|
683 (message "Loading %s...done." file)))
|
|
|
684
|
|
|
685 (jka-compr-delete-temp-file local-copy))
|
|
|
686
|
|
|
687 t))
|
|
2
|
688
|
|
|
689 (defun jka-compr-byte-compiler-base-file-name (file)
|
|
|
690 (let ((info (jka-compr-get-compression-info file)))
|
|
|
691 (if (and info (jka-compr-info-strip-extension info))
|
|
|
692 (save-match-data
|
|
|
693 (substring file 0 (string-match (jka-compr-info-regexp info) file)))
|
|
|
694 file)))
|
|
0
|
695
|
|
|
696 (put 'write-region 'jka-compr 'jka-compr-write-region)
|
|
|
697 (put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents)
|
|
|
698 (put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy)
|
|
|
699 (put 'load 'jka-compr 'jka-compr-load)
|
|
2
|
700 (put 'byte-compiler-base-file-name 'jka-compr
|
|
|
701 'jka-compr-byte-compiler-base-file-name)
|
|
0
|
702
|
|
|
703 (defun jka-compr-handler (operation &rest args)
|
|
|
704 (save-match-data
|
|
|
705 (let ((jka-op (get operation 'jka-compr)))
|
|
|
706 (if jka-op
|
|
|
707 (apply jka-op args)
|
|
|
708 (jka-compr-run-real-handler operation args)))))
|
|
|
709
|
|
|
710 ;; If we are given an operation that we don't handle,
|
|
|
711 ;; call the Emacs primitive for that operation,
|
|
|
712 ;; and manipulate the inhibit variables
|
|
|
713 ;; to prevent the primitive from calling our handler again.
|
|
|
714 (defun jka-compr-run-real-handler (operation args)
|
|
|
715 (let ((inhibit-file-name-handlers
|
|
|
716 (cons 'jka-compr-handler
|
|
|
717 (and (eq inhibit-file-name-operation operation)
|
|
|
718 inhibit-file-name-handlers)))
|
|
|
719 (inhibit-file-name-operation operation))
|
|
|
720 (apply operation args)))
|
|
|
721
|
|
2
|
722 ;; XEmacs change: I don't have a clue what this is trying do. -sb
|
|
|
723 ;; ;;;###autoload(defun auto-compression-mode (&optional arg)
|
|
|
724 ;; ;;;###autoload "\
|
|
|
725 ;; ;;;###autoloadToggle automatic file compression and uncompression.
|
|
|
726 ;; ;;;###autoloadWith prefix argument ARG, turn auto compression on if positive, else off.
|
|
|
727 ;; ;;;###autoloadReturns the new status of auto compression (non-nil means on)."
|
|
|
728 ;; ;;;###autoload (interactive "P")
|
|
|
729 ;; ;;;###autoload (if (not (fboundp 'jka-compr-installed-p))
|
|
|
730 ;; ;;;###autoload (progn
|
|
|
731 ;; ;;;###autoload (require 'jka-compr)
|
|
|
732 ;; ;;;###autoload ;; That turned the mode on, so make it initially off.
|
|
|
733 ;; ;;;###autoload (toggle-auto-compression)))
|
|
|
734 ;; ;;;###autoload (toggle-auto-compression arg t))
|
|
|
735
|
|
|
736 ;; XEmacs: autoload this function
|
|
0
|
737 ;;;###autoload
|
|
2
|
738 (defun toggle-auto-compression (&optional arg message)
|
|
|
739 "Toggle automatic file compression and uncompression.
|
|
0
|
740 With prefix argument ARG, turn auto compression on if positive, else off.
|
|
2
|
741 Returns the new status of auto compression (non-nil means on).
|
|
|
742 If the argument MESSAGE is non-nil, it means to print a message
|
|
|
743 saying whether the mode is now on or off."
|
|
|
744 (interactive "P\np")
|
|
0
|
745 (let* ((installed (jka-compr-installed-p))
|
|
|
746 (flag (if (null arg)
|
|
|
747 (not installed)
|
|
|
748 (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0))))))
|
|
|
749
|
|
|
750 (cond
|
|
|
751 ((and flag installed) t) ; already installed
|
|
|
752
|
|
|
753 ((and (not flag) (not installed)) nil) ; already not installed
|
|
|
754
|
|
|
755 (flag
|
|
|
756 (jka-compr-install))
|
|
|
757
|
|
|
758 (t
|
|
|
759 (jka-compr-uninstall)))
|
|
|
760
|
|
|
761
|
|
2
|
762 (and message
|
|
0
|
763 (if flag
|
|
|
764 (message "Automatic file (de)compression is now ON.")
|
|
|
765 (message "Automatic file (de)compression is now OFF.")))
|
|
|
766
|
|
|
767 flag))
|
|
|
768
|
|
|
769
|
|
|
770 (defun jka-compr-build-file-regexp ()
|
|
|
771 (concat
|
|
|
772 "\\("
|
|
|
773 (mapconcat
|
|
|
774 'jka-compr-info-regexp
|
|
|
775 jka-compr-compression-info-list
|
|
|
776 "\\)\\|\\(")
|
|
|
777 "\\)"))
|
|
|
778
|
|
|
779 ;;;###autoload
|
|
|
780 (defun jka-compr-install ()
|
|
|
781 "Install jka-compr.
|
|
|
782 This adds entries to `file-name-handler-alist' and `auto-mode-alist'
|
|
|
783 and `inhibit-first-line-modes-suffixes'."
|
|
|
784
|
|
|
785 (setq jka-compr-file-name-handler-entry
|
|
|
786 (cons (jka-compr-build-file-regexp) 'jka-compr-handler))
|
|
|
787
|
|
|
788 (setq file-name-handler-alist (cons jka-compr-file-name-handler-entry
|
|
|
789 file-name-handler-alist))
|
|
|
790
|
|
|
791 (mapcar
|
|
|
792 (function (lambda (x)
|
|
|
793 (and (jka-compr-info-strip-extension x)
|
|
|
794 ;; Make entries in auto-mode-alist so that modes
|
|
|
795 ;; are chosen right according to the file names
|
|
|
796 ;; sans `.gz'.
|
|
|
797 (setq auto-mode-alist
|
|
|
798 (cons (list (jka-compr-info-regexp x)
|
|
|
799 nil 'jka-compr)
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|
|
800 auto-mode-alist))
|
|
|
801 ;; Also add these regexps to
|
|
|
802 ;; inhibit-first-line-modes-suffixes, so that a
|
|
|
803 ;; -*- line in the first file of a compressed tar
|
|
|
804 ;; file doesn't override tar-mode.
|
|
2
|
805 ;; XEmacs: the (now)superfluous conditional doesn't hurt
|
|
0
|
806 (and (boundp 'inhibit-first-line-modes-suffixes)
|
|
|
807 (setq inhibit-first-line-modes-suffixes
|
|
|
808 (cons (jka-compr-info-regexp x)
|
|
|
809 inhibit-first-line-modes-suffixes))))))
|
|
|
810 jka-compr-compression-info-list)
|
|
|
811 (setq auto-mode-alist
|
|
|
812 (append auto-mode-alist jka-compr-mode-alist-additions)))
|
|
|
813
|
|
|
814
|
|
|
815 (defun jka-compr-uninstall ()
|
|
|
816 "Uninstall jka-compr.
|
|
|
817 This removes the entries in `file-name-handler-alist' and `auto-mode-alist'
|
|
|
818 and `inhibit-first-line-modes-suffixes' that were added
|
|
|
819 by `jka-compr-installed'."
|
|
|
820 ;; Delete from inhibit-first-line-modes-suffixes
|
|
|
821 ;; what jka-compr-install added.
|
|
|
822 (mapcar
|
|
|
823 (function (lambda (x)
|
|
|
824 (and (jka-compr-info-strip-extension x)
|
|
2
|
825 ;; XEmacs: the (now)superfluous conditional doesn't hurt
|
|
0
|
826 (and (boundp 'inhibit-first-line-modes-suffixes)
|
|
|
827 (setq inhibit-first-line-modes-suffixes
|
|
|
828 (delete (jka-compr-info-regexp x)
|
|
|
829 inhibit-first-line-modes-suffixes)))))
|
|
|
830 )
|
|
|
831 jka-compr-compression-info-list)
|
|
|
832
|
|
|
833 (let* ((fnha (cons nil file-name-handler-alist))
|
|
|
834 (last fnha))
|
|
|
835
|
|
|
836 (while (cdr last)
|
|
|
837 (if (eq (cdr (car (cdr last))) 'jka-compr-handler)
|
|
|
838 (setcdr last (cdr (cdr last)))
|
|
|
839 (setq last (cdr last))))
|
|
|
840
|
|
|
841 (setq file-name-handler-alist (cdr fnha)))
|
|
|
842
|
|
|
843 (let* ((ama (cons nil auto-mode-alist))
|
|
|
844 (last ama)
|
|
|
845 entry)
|
|
|
846
|
|
|
847 (while (cdr last)
|
|
|
848 (setq entry (car (cdr last)))
|
|
|
849 (if (or (member entry jka-compr-mode-alist-additions)
|
|
|
850 (and (consp (cdr entry))
|
|
|
851 (eq (nth 2 entry) 'jka-compr)))
|
|
|
852 (setcdr last (cdr (cdr last)))
|
|
|
853 (setq last (cdr last))))
|
|
|
854
|
|
|
855 (setq auto-mode-alist (cdr ama))))
|
|
|
856
|
|
|
857
|
|
|
858 (defun jka-compr-installed-p ()
|
|
|
859 "Return non-nil if jka-compr is installed.
|
|
|
860 The return value is the entry in `file-name-handler-alist' for jka-compr."
|
|
110
|
861 (rassq 'jka-compr-handler file-name-handler-alist))
|
|
0
|
862
|
|
|
863
|
|
|
864 ;;; Add the file I/O hook if it does not already exist.
|
|
|
865 ;;; Make sure that jka-compr-file-name-handler-entry is eq to the
|
|
|
866 ;;; entry for jka-compr in file-name-handler-alist.
|
|
|
867 (and (jka-compr-installed-p)
|
|
|
868 (jka-compr-uninstall))
|
|
|
869
|
|
|
870 (jka-compr-install)
|
|
|
871
|
|
|
872
|
|
|
873 (provide 'jka-compr)
|
|
|
874
|
|
|
875 ;; jka-compr.el ends here.
|
