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1 ;;; jka-compr.el - reading/writing/loading compressed files.
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2 ;;; Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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3
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4 ;; Author: jka@ece.cmu.edu (Jay K. Adams)
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5 ;; Keywords: data
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6
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7 ;;; Synched up with: Very close to the version supplied with
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8 ;;; FSF 19.29 but not quite synched.
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9
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10 ;;; Commentary:
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11
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12 ;;; This package implements low-level support for reading, writing,
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13 ;;; and loading compressed files. It hooks into the low-level file
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14 ;;; I/O functions (including write-region and insert-file-contents) so
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15 ;;; that they automatically compress or uncompress a file if the file
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16 ;;; appears to need it (based on the extension of the file name).
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17 ;;; Packages like Rmail, VM, GNUS, and Info should be able to work
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18 ;;; with compressed files without modification.
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19
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20
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21 ;;; INSTRUCTIONS:
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22 ;;;
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23 ;;; To use jka-compr, simply load this package, and edit as usual.
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24 ;;; Its operation should be transparent to the user (except for
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25 ;;; messages appearing when a file is being compressed or
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26 ;;; uncompressed).
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27 ;;;
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28 ;;; The variable, jka-compr-compression-info-list can be used to
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29 ;;; customize jka-compr to work with other compression programs.
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30 ;;; The default value of this variable allows jka-compr to work with
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31 ;;; Unix compress and gzip.
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32 ;;;
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33 ;;; If you are concerned about the stderr output of gzip and other
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34 ;;; compression/decompression programs showing up in your buffers, you
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35 ;;; should set the discard-error flag in the compression-info-list.
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36 ;;; This will cause the stderr of all programs to be discarded.
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37 ;;; However, it also causes emacs to call compression/uncompression
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38 ;;; programs through a shell (which is specified by jka-compr-shell).
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39 ;;; This may be a drag if, on your system, starting up a shell is
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40 ;;; slow.
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41 ;;;
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42 ;;; If you don't want messages about compressing and decompressing
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43 ;;; to show up in the echo area, you can set the compress-name and
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44 ;;; decompress-name fields of the jka-compr-compression-info-list to
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45 ;;; nil.
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46
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47
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48 ;;; APPLICATION NOTES:
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49 ;;;
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50 ;;; crypt++
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51 ;;; jka-compr can coexist with crpyt++ if you take all the decompression
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52 ;;; entries out of the crypt-encoding-list. Clearly problems will arise if
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53 ;;; you have two programs trying to compress/decompress files. jka-compr
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54 ;;; will not "work with" crypt++ in the following sense: you won't be able to
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55 ;;; decode encrypted compressed files--that is, files that have been
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56 ;;; compressed then encrypted (in that order). Theoretically, crypt++ and
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57 ;;; jka-compr could properly handle a file that has been encrypted then
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58 ;;; compressed, but there is little point in trying to compress an encrypted
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59 ;;; file.
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60 ;;;
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61
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62
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63 ;;; ACKNOWLEDGMENTS
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64 ;;;
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65 ;;; jka-compr is a V19 adaptation of jka-compr for V18 of Emacs. Many people
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66 ;;; have made helpful suggestions, reported bugs, and even fixed bugs in
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67 ;;; jka-compr. I recall the following people as being particularly helpful.
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68 ;;;
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69 ;;; Jean-loup Gailly
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70 ;;; David Hughes
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71 ;;; Richard Pieri
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72 ;;; Daniel Quinlan
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73 ;;; Chris P. Ross
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74 ;;; Rick Sladkey
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75 ;;;
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76 ;;; Andy Norman's ange-ftp was the inspiration for the original jka-compr for
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77 ;;; Version 18 of Emacs.
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78 ;;;
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79 ;;; After I had made progress on the original jka-compr for V18, I learned of a
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80 ;;; package written by Kazushi Jam Marukawa, called jam-zcat, that did exactly
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81 ;;; what I was trying to do. I looked over the jam-zcat source code and
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82 ;;; probably got some ideas from it.
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83 ;;;
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84
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85 ;;; Code:
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86
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87 (defvar jka-compr-shell "sh"
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88 "*Shell to be used for calling compression programs.
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89 The value of this variable only matters if you want to discard the
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90 stderr of a compression/decompression program (see the documentation
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91 for `jka-compr-compression-info-list').")
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92
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93
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94 (defvar jka-compr-use-shell t)
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95
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96
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97 ;;; I have this defined so that .Z files are assumed to be in unix
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98 ;;; compress format; and .gz files, in gzip format.
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99 (defvar jka-compr-compression-info-list
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100 ;;[regexp
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101 ;; compr-message compr-prog compr-args
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102 ;; uncomp-message uncomp-prog uncomp-args
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103 ;; can-append auto-mode-flag]
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104 '(["\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'"
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105 "compressing" "compress" ("-c")
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106 "uncompressing" "uncompress" ("-c")
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107 nil t]
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108 ["\\.tgz\\'"
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109 "zipping" "gzip" ("-c" "-q")
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110 "unzipping" "gzip" ("-c" "-q" "-d")
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111 t nil]
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112 ["\\.gz\\(~\\|\\.~[0-9]+~\\)?\\'"
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113 "zipping" "gzip" ("-c" "-q")
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114 "unzipping" "gzip" ("-c" "-q" "-d")
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115 t t])
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116
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117 "List of vectors that describe available compression techniques.
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118 Each element, which describes a compression technique, is a vector of
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119 the form [REGEXP COMPRESS-MSG COMPRESS-PROGRAM COMPRESS-ARGS
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120 UNCOMPRESS-MSG UNCOMPRESS-PROGRAM UNCOMPRESS-ARGS
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121 APPEND-FLAG EXTENSION], where:
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122
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123 regexp is a regexp that matches filenames that are
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124 compressed with this format
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125
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126 compress-msg is the message to issue to the user when doing this
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127 type of compression (nil means no message)
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128
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129 compress-program is a program that performs this compression
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130
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131 compress-args is a list of args to pass to the compress program
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132
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133 uncompress-msg is the message to issue to the user when doing this
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134 type of uncompression (nil means no message)
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135
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136 uncompress-program is a program that performs this compression
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137
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138 uncompress-args is a list of args to pass to the uncompress program
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139
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140 append-flag is non-nil if this compression technique can be
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141 appended
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142
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143 auto-mode flag non-nil means strip the regexp from file names
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144 before attempting to set the mode.
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145
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146 Because of the way `call-process' is defined, discarding the stderr output of
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147 a program adds the overhead of starting a shell each time the program is
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148 invoked.")
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149
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150 (defvar jka-compr-mode-alist-additions
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151 (list (cons "\\.tgz\\'" 'tar-mode))
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152 "A list of pairs to add to auto-mode-alist when jka-compr is installed.")
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153
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154 (defvar jka-compr-file-name-handler-entry
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155 nil
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156 "The entry in `file-name-handler-alist' used by the jka-compr I/O functions.")
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157
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158 ;;; Functions for accessing the return value of jka-get-compression-info
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159 (defun jka-compr-info-regexp (info) (aref info 0))
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160 (defun jka-compr-info-compress-message (info) (aref info 1))
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161 (defun jka-compr-info-compress-program (info) (aref info 2))
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162 (defun jka-compr-info-compress-args (info) (aref info 3))
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163 (defun jka-compr-info-uncompress-message (info) (aref info 4))
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164 (defun jka-compr-info-uncompress-program (info) (aref info 5))
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165 (defun jka-compr-info-uncompress-args (info) (aref info 6))
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166 (defun jka-compr-info-can-append (info) (aref info 7))
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167 (defun jka-compr-info-strip-extension (info) (aref info 8))
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168
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169
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170 (defun jka-compr-get-compression-info (filename)
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171 "Return information about the compression scheme of FILENAME.
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172 The determination as to which compression scheme, if any, to use is
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173 based on the filename itself and `jka-compr-compression-info-list'."
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174 (catch 'compression-info
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175 (let ((case-fold-search nil))
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176 (mapcar
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177 (function (lambda (x)
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178 (and (string-match (jka-compr-info-regexp x) filename)
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179 (throw 'compression-info x))))
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180 jka-compr-compression-info-list)
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181 nil)))
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182
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183
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184 ;; XEmacs change
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185 (define-error 'compression-error "Compression error" 'file-error)
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186
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187 (defvar jka-compr-acceptable-retval-list '(0 2 141))
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188
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189
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190 (defun jka-compr-error (prog args infile message &optional errfile)
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191
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192 (let ((errbuf (get-buffer-create " *jka-compr-error*"))
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193 (curbuf (current-buffer)))
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194 (set-buffer errbuf)
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195 (widen) (erase-buffer)
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196 (insert (format "Error while executing \"%s %s < %s\"\n\n"
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197 prog
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198 (mapconcat 'identity args " ")
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199 infile))
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200
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201 (and errfile
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202 (insert-file-contents errfile))
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203
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204 (set-buffer curbuf)
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205 (display-buffer errbuf))
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206
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207 (signal 'compression-error (list "Opening input file" (format "error %s" message) infile)))
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208
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209
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210 (defvar jka-compr-dd-program
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211 "/bin/dd")
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212
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213
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214 (defvar jka-compr-dd-blocksize 256)
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215
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216
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217 (defun jka-compr-partial-uncompress (prog message args infile beg len)
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218 "Call program PROG with ARGS args taking input from INFILE.
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219 Fourth and fifth args, BEG and LEN, specify which part of the output
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220 to keep: LEN chars starting BEG chars from the beginning."
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221 (let* ((skip (/ beg jka-compr-dd-blocksize))
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222 (prefix (- beg (* skip jka-compr-dd-blocksize)))
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223 (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize))))
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224 (start (point))
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225 (err-file (jka-compr-make-temp-name))
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226 (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null"
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227 prog
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228 (mapconcat 'identity args " ")
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229 err-file
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230 jka-compr-dd-program
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231 jka-compr-dd-blocksize
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232 skip
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233 ;; dd seems to be unreliable about
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234 ;; providing the last block. So, always
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235 ;; read one more than you think you need.
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236 (if count (concat "count=" (1+ count)) ""))))
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237
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238 (unwind-protect
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239 (or (memq (call-process jka-compr-shell
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240 infile t nil "-c"
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241 run-string)
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242 jka-compr-acceptable-retval-list)
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243
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244 (jka-compr-error prog args infile message err-file))
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245
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246 (jka-compr-delete-temp-file err-file))
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247
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248 ;; Delete the stuff after what we want, if there is any.
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249 (and
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250 len
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251 (< (+ start prefix len) (point))
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252 (delete-region (+ start prefix len) (point)))
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253
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254 ;; Delete the stuff before what we want.
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255 (delete-region start (+ start prefix))))
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256
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257
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258 (defun jka-compr-call-process (prog message infile output temp args)
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259 (if jka-compr-use-shell
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260
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261 (let ((err-file (jka-compr-make-temp-name)))
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262
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263 (unwind-protect
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264
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265 (or (memq
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266 (call-process jka-compr-shell infile
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267 (if (stringp output) nil output)
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268 nil
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269 "-c"
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270 (format "%s %s 2> %s %s"
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271 prog
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272 (mapconcat 'identity args " ")
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273 err-file
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274 (if (stringp output)
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275 (concat "> " output)
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276 "")))
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277 jka-compr-acceptable-retval-list)
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278
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279 (jka-compr-error prog args infile message err-file))
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280
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281 (jka-compr-delete-temp-file err-file)))
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282
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283 (or (zerop
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284 (apply 'call-process
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285 prog
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286 infile
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287 (if (stringp output) temp output)
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288 nil
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289 args))
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290 (jka-compr-error prog args infile message))
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291
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292 (and (stringp output)
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293 (let ((cbuf (current-buffer)))
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294 (set-buffer temp)
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295 (write-region (point-min) (point-max) output)
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296 (erase-buffer)
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297 (set-buffer cbuf)))))
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298
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299
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300 ;;; Support for temp files. Much of this was inspired if not lifted
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301 ;;; from ange-ftp.
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302
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303 (defvar jka-compr-temp-name-template
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304 "/tmp/jka-com"
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305 "Prefix added to all temp files created by jka-compr.
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306 There should be no more than seven characters after the final `/'")
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307
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308 (defvar jka-compr-temp-name-table (make-vector 31 nil))
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309
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310 (defun jka-compr-make-temp-name (&optional local-copy)
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311 "This routine will return the name of a new file."
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312 (let* ((lastchar ?a)
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313 (prevchar ?a)
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314 (template (concat jka-compr-temp-name-template "aa"))
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315 (lastpos (1- (length template)))
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316 (not-done t)
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317 file
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318 entry)
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319
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320 (while not-done
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321 (aset template lastpos lastchar)
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322 (setq file (concat (make-temp-name template) "#"))
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323 (setq entry (intern file jka-compr-temp-name-table))
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324 (if (or (get entry 'active)
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325 (file-exists-p file))
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326
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327 (progn
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328 (setq lastchar (1+ lastchar))
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329 (if (> lastchar ?z)
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330 (progn
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331 (setq prevchar (1+ prevchar))
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332 (setq lastchar ?a)
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333 (if (> prevchar ?z)
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334 (error "Can't allocate temp file.")
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335 (aset template (1- lastpos) prevchar)))))
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336
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337 (put entry 'active (not local-copy))
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338 (setq not-done nil)))
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339
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340 file))
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341
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342
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343 (defun jka-compr-delete-temp-file (temp)
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344
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345 (put (intern temp jka-compr-temp-name-table)
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346 'active nil)
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347
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348 (condition-case ()
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349 (delete-file temp)
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350 (error nil)))
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351
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352
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353 (defun jka-compr-write-region (start end file &optional append visit)
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354 (let* ((filename (expand-file-name file))
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355 (visit-file (if (stringp visit) (expand-file-name visit) filename))
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356 (info (jka-compr-get-compression-info visit-file)))
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357
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358 (if info
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359
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360 (let ((can-append (jka-compr-info-can-append info))
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361 (compress-program (jka-compr-info-compress-program info))
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362 (compress-message (jka-compr-info-compress-message info))
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363 (uncompress-program (jka-compr-info-uncompress-program info))
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364 (uncompress-message (jka-compr-info-uncompress-message info))
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365 (compress-args (jka-compr-info-compress-args info))
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366 (uncompress-args (jka-compr-info-uncompress-args info))
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367 (base-name (file-name-nondirectory visit-file))
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368 temp-file cbuf temp-buffer)
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369
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370 (setq cbuf (current-buffer)
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371 temp-buffer (get-buffer-create " *jka-compr-wr-temp*"))
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372 (set-buffer temp-buffer)
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373 (widen) (erase-buffer)
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374 (set-buffer cbuf)
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375
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376 (if (and append
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377 (not can-append)
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378 (file-exists-p filename))
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379
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380 (let* ((local-copy (file-local-copy filename))
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381 (local-file (or local-copy filename)))
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382
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383 (setq temp-file local-file))
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384
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385 (setq temp-file (jka-compr-make-temp-name)))
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386
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387 (and
|
|
|
388 compress-message
|
|
|
389 (message "%s %s..." compress-message base-name))
|
|
|
390
|
|
|
391 (jka-compr-run-real-handler 'write-region
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|
|
392 (list start end temp-file t 'dont))
|
|
|
393
|
|
|
394 (jka-compr-call-process compress-program
|
|
|
395 (concat compress-message
|
|
|
396 " " base-name)
|
|
|
397 temp-file
|
|
|
398 temp-buffer
|
|
|
399 nil
|
|
|
400 compress-args)
|
|
|
401
|
|
|
402 (set-buffer temp-buffer)
|
|
|
403 (jka-compr-run-real-handler 'write-region
|
|
|
404 (list (point-min) (point-max)
|
|
|
405 filename
|
|
|
406 (and append can-append) 'dont))
|
|
|
407 (erase-buffer)
|
|
|
408 (set-buffer cbuf)
|
|
|
409
|
|
|
410 (jka-compr-delete-temp-file temp-file)
|
|
|
411
|
|
|
412 (and
|
|
|
413 compress-message
|
|
|
414 (message "%s %s...done" compress-message base-name))
|
|
|
415
|
|
|
416 (cond
|
|
|
417 ((eq visit t)
|
|
|
418 (setq buffer-file-name filename)
|
|
|
419 (set-visited-file-modtime))
|
|
|
420 ((stringp visit)
|
|
|
421 (setq buffer-file-name visit)
|
|
|
422 (let ((buffer-file-name filename))
|
|
|
423 (set-visited-file-modtime))))
|
|
|
424
|
|
|
425 (and (or (eq visit t)
|
|
|
426 (eq visit nil)
|
|
|
427 (stringp visit))
|
|
|
428 (message "Wrote %s" visit-file))
|
|
|
429
|
|
|
430 nil)
|
|
|
431
|
|
|
432 (jka-compr-run-real-handler 'write-region
|
|
|
433 (list start end filename append visit)))))
|
|
|
434
|
|
|
435
|
|
|
436 (defun jka-compr-insert-file-contents (file &optional visit beg end replace)
|
|
|
437 (barf-if-buffer-read-only)
|
|
|
438
|
|
|
439 (and (or beg end)
|
|
|
440 visit
|
|
|
441 (error "Attempt to visit less than an entire file"))
|
|
|
442
|
|
|
443 (let* ((filename (expand-file-name file))
|
|
|
444 (info (jka-compr-get-compression-info filename)))
|
|
|
445
|
|
|
446 (if info
|
|
|
447
|
|
|
448 (let ((uncompress-message (jka-compr-info-uncompress-message info))
|
|
|
449 (uncompress-program (jka-compr-info-uncompress-program info))
|
|
|
450 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
451 (base-name (file-name-nondirectory filename))
|
|
|
452 (notfound nil)
|
|
|
453 (local-copy
|
|
|
454 (jka-compr-run-real-handler 'file-local-copy (list filename)))
|
|
|
455 local-file
|
|
|
456 size start)
|
|
|
457
|
|
|
458 (setq local-file (or local-copy filename))
|
|
|
459
|
|
|
460 (and
|
|
|
461 visit
|
|
|
462 (setq buffer-file-name filename))
|
|
|
463
|
|
|
464 (unwind-protect ; to make sure local-copy gets deleted
|
|
|
465
|
|
|
466 (progn
|
|
|
467
|
|
|
468 (and
|
|
|
469 uncompress-message
|
|
|
470 (message "%s %s..." uncompress-message base-name))
|
|
|
471
|
|
|
472 (condition-case error-code
|
|
|
473
|
|
|
474 (progn
|
|
|
475 (if replace
|
|
|
476 (goto-char (point-min)))
|
|
|
477 (setq start (point))
|
|
|
478 (if (or beg end)
|
|
|
479 (jka-compr-partial-uncompress uncompress-program
|
|
|
480 (concat uncompress-message
|
|
|
481 " " base-name)
|
|
|
482 uncompress-args
|
|
|
483 local-file
|
|
|
484 (or beg 0)
|
|
|
485 (if (and beg end)
|
|
|
486 (- end beg)
|
|
|
487 end))
|
|
|
488 (jka-compr-call-process uncompress-program
|
|
|
489 (concat uncompress-message
|
|
|
490 " " base-name)
|
|
|
491 local-file
|
|
|
492 t
|
|
|
493 nil
|
|
|
494 uncompress-args))
|
|
|
495 (setq size (- (point) start))
|
|
|
496 (if replace
|
|
|
497 (let* ((del-beg (point))
|
|
|
498 (del-end (+ del-beg size)))
|
|
|
499 (delete-region del-beg
|
|
|
500 (min del-end (point-max)))))
|
|
|
501 (goto-char start))
|
|
|
502 (error
|
|
|
503 (if (and (eq (car error-code) 'file-error)
|
|
|
504 (eq (nth 3 error-code) local-file))
|
|
|
505 (if visit
|
|
|
506 (setq notfound error-code)
|
|
|
507 (signal 'file-error
|
|
|
508 (cons "Opening input file"
|
|
|
509 (nthcdr 2 error-code))))
|
|
|
510 (signal (car error-code) (cdr error-code))))))
|
|
|
511
|
|
|
512 (and
|
|
|
513 local-copy
|
|
|
514 (file-exists-p local-copy)
|
|
|
515 (delete-file local-copy)))
|
|
|
516
|
|
|
517 (and
|
|
|
518 visit
|
|
|
519 (progn
|
|
|
520 (unlock-buffer)
|
|
|
521 (setq buffer-file-name filename)
|
|
|
522 (set-visited-file-modtime)))
|
|
|
523
|
|
|
524 (and
|
|
|
525 uncompress-message
|
|
|
526 (message "%s %s...done" uncompress-message base-name))
|
|
|
527
|
|
|
528 (and
|
|
|
529 visit
|
|
|
530 notfound
|
|
|
531 (signal 'file-error
|
|
|
532 (cons "Opening input file" (nth 2 notfound))))
|
|
|
533
|
|
|
534 ;; Run the functions that insert-file-contents would.
|
|
|
535 (let ((p after-insert-file-functions)
|
|
|
536 (insval size))
|
|
|
537 (while p
|
|
|
538 (setq insval (funcall (car p) size))
|
|
|
539 (if insval
|
|
|
540 (progn
|
|
|
541 (or (integerp insval)
|
|
|
542 (signal 'wrong-type-argument
|
|
|
543 (list 'integerp insval)))
|
|
|
544 (setq size insval)))
|
|
|
545 (setq p (cdr p))))
|
|
|
546
|
|
|
547 (list filename size))
|
|
|
548
|
|
|
549 (jka-compr-run-real-handler 'insert-file-contents
|
|
|
550 (list file visit beg end replace)))))
|
|
|
551
|
|
|
552
|
|
|
553 (defun jka-compr-file-local-copy (file)
|
|
|
554 (let* ((filename (expand-file-name file))
|
|
|
555 (info (jka-compr-get-compression-info filename)))
|
|
|
556
|
|
|
557 (if info
|
|
|
558
|
|
|
559 (let ((uncompress-message (jka-compr-info-uncompress-message info))
|
|
|
560 (uncompress-program (jka-compr-info-uncompress-program info))
|
|
|
561 (uncompress-args (jka-compr-info-uncompress-args info))
|
|
|
562 (base-name (file-name-nondirectory filename))
|
|
|
563 (local-copy
|
|
|
564 (jka-compr-run-real-handler 'file-local-copy (list filename)))
|
|
|
565 (temp-file (jka-compr-make-temp-name t))
|
|
|
566 (temp-buffer (get-buffer-create " *jka-compr-flc-temp*"))
|
|
|
567 (notfound nil)
|
|
|
568 (cbuf (current-buffer))
|
|
|
569 local-file)
|
|
|
570
|
|
|
571 (setq local-file (or local-copy filename))
|
|
|
572
|
|
|
573 (unwind-protect
|
|
|
574
|
|
|
575 (progn
|
|
|
576
|
|
|
577 (and
|
|
|
578 uncompress-message
|
|
|
579 (message "%s %s..." uncompress-message base-name))
|
|
|
580
|
|
|
581 (set-buffer temp-buffer)
|
|
|
582
|
|
|
583 (jka-compr-call-process uncompress-program
|
|
|
584 (concat uncompress-message
|
|
|
585 " " base-name)
|
|
|
586 local-file
|
|
|
587 t
|
|
|
588 nil
|
|
|
589 uncompress-args)
|
|
|
590
|
|
|
591 (and
|
|
|
592 uncompress-message
|
|
|
593 (message "%s %s...done" uncompress-message base-name))
|
|
|
594
|
|
|
595 (write-region
|
|
|
596 (point-min) (point-max) temp-file nil 'dont))
|
|
|
597
|
|
|
598 (and
|
|
|
599 local-copy
|
|
|
600 (file-exists-p local-copy)
|
|
|
601 (delete-file local-copy))
|
|
|
602
|
|
|
603 (set-buffer cbuf)
|
|
|
604 (kill-buffer temp-buffer))
|
|
|
605
|
|
|
606 temp-file)
|
|
|
607
|
|
|
608 (jka-compr-run-real-handler 'file-local-copy (list filename)))))
|
|
|
609
|
|
|
610
|
|
|
611 ;;; Support for loading compressed files.
|
|
|
612 ;;;###autoload
|
|
|
613 (defun jka-compr-load (file &optional noerror nomessage nosuffix)
|
|
|
614 "Documented as original."
|
|
|
615
|
|
|
616 (let* ((local-copy (jka-compr-file-local-copy file))
|
|
|
617 (load-file (or local-copy file)))
|
|
|
618
|
|
|
619 (unwind-protect
|
|
|
620
|
|
|
621 (let (inhibit-file-name-operation
|
|
|
622 inhibit-file-name-handlers)
|
|
|
623 (or nomessage
|
|
|
624 (message "Loading %s..." file))
|
|
|
625
|
|
|
626 (load load-file noerror t t)
|
|
|
627
|
|
|
628 (or nomessage
|
|
|
629 (message "Loading %s...done." file)))
|
|
|
630
|
|
|
631 (jka-compr-delete-temp-file local-copy))
|
|
|
632
|
|
|
633 t))
|
|
|
634
|
|
|
635 (put 'write-region 'jka-compr 'jka-compr-write-region)
|
|
|
636 (put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents)
|
|
|
637 (put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy)
|
|
|
638 (put 'load 'jka-compr 'jka-compr-load)
|
|
|
639
|
|
|
640 (defun jka-compr-handler (operation &rest args)
|
|
|
641 (save-match-data
|
|
|
642 (let ((jka-op (get operation 'jka-compr)))
|
|
|
643 (if jka-op
|
|
|
644 (apply jka-op args)
|
|
|
645 (jka-compr-run-real-handler operation args)))))
|
|
|
646
|
|
|
647 ;; If we are given an operation that we don't handle,
|
|
|
648 ;; call the Emacs primitive for that operation,
|
|
|
649 ;; and manipulate the inhibit variables
|
|
|
650 ;; to prevent the primitive from calling our handler again.
|
|
|
651 (defun jka-compr-run-real-handler (operation args)
|
|
|
652 (let ((inhibit-file-name-handlers
|
|
|
653 (cons 'jka-compr-handler
|
|
|
654 (and (eq inhibit-file-name-operation operation)
|
|
|
655 inhibit-file-name-handlers)))
|
|
|
656 (inhibit-file-name-operation operation))
|
|
|
657 (apply operation args)))
|
|
|
658
|
|
|
659 ;;;###autoload
|
|
|
660 (defun toggle-auto-compression (arg)
|
|
|
661 "Toggle automatic file compression and decompression.
|
|
|
662 With prefix argument ARG, turn auto compression on if positive, else off.
|
|
|
663 Returns the new status of auto compression (non-nil means on)."
|
|
|
664 (interactive "P")
|
|
|
665 (let* ((installed (jka-compr-installed-p))
|
|
|
666 (flag (if (null arg)
|
|
|
667 (not installed)
|
|
|
668 (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0))))))
|
|
|
669
|
|
|
670 (cond
|
|
|
671 ((and flag installed) t) ; already installed
|
|
|
672
|
|
|
673 ((and (not flag) (not installed)) nil) ; already not installed
|
|
|
674
|
|
|
675 (flag
|
|
|
676 (jka-compr-install))
|
|
|
677
|
|
|
678 (t
|
|
|
679 (jka-compr-uninstall)))
|
|
|
680
|
|
|
681
|
|
|
682 (and (interactive-p)
|
|
|
683 (if flag
|
|
|
684 (message "Automatic file (de)compression is now ON.")
|
|
|
685 (message "Automatic file (de)compression is now OFF.")))
|
|
|
686
|
|
|
687 flag))
|
|
|
688
|
|
|
689
|
|
|
690 (defun jka-compr-build-file-regexp ()
|
|
|
691 (concat
|
|
|
692 "\\("
|
|
|
693 (mapconcat
|
|
|
694 'jka-compr-info-regexp
|
|
|
695 jka-compr-compression-info-list
|
|
|
696 "\\)\\|\\(")
|
|
|
697 "\\)"))
|
|
|
698
|
|
|
699 ;;;###autoload
|
|
|
700 (defun jka-compr-install ()
|
|
|
701 "Install jka-compr.
|
|
|
702 This adds entries to `file-name-handler-alist' and `auto-mode-alist'
|
|
|
703 and `inhibit-first-line-modes-suffixes'."
|
|
|
704
|
|
|
705 (setq jka-compr-file-name-handler-entry
|
|
|
706 (cons (jka-compr-build-file-regexp) 'jka-compr-handler))
|
|
|
707
|
|
|
708 (setq file-name-handler-alist (cons jka-compr-file-name-handler-entry
|
|
|
709 file-name-handler-alist))
|
|
|
710
|
|
|
711 (mapcar
|
|
|
712 (function (lambda (x)
|
|
|
713 (and (jka-compr-info-strip-extension x)
|
|
|
714 ;; Make entries in auto-mode-alist so that modes
|
|
|
715 ;; are chosen right according to the file names
|
|
|
716 ;; sans `.gz'.
|
|
|
717 (setq auto-mode-alist
|
|
|
718 (cons (list (jka-compr-info-regexp x)
|
|
|
719 nil 'jka-compr)
|
|
|
720 auto-mode-alist))
|
|
|
721 ;; Also add these regexps to
|
|
|
722 ;; inhibit-first-line-modes-suffixes, so that a
|
|
|
723 ;; -*- line in the first file of a compressed tar
|
|
|
724 ;; file doesn't override tar-mode.
|
|
|
725 (and (boundp 'inhibit-first-line-modes-suffixes)
|
|
|
726 (setq inhibit-first-line-modes-suffixes
|
|
|
727 (cons (jka-compr-info-regexp x)
|
|
|
728 inhibit-first-line-modes-suffixes))))))
|
|
|
729 jka-compr-compression-info-list)
|
|
|
730 (setq auto-mode-alist
|
|
|
731 (append auto-mode-alist jka-compr-mode-alist-additions)))
|
|
|
732
|
|
|
733
|
|
|
734 (defun jka-compr-uninstall ()
|
|
|
735 "Uninstall jka-compr.
|
|
|
736 This removes the entries in `file-name-handler-alist' and `auto-mode-alist'
|
|
|
737 and `inhibit-first-line-modes-suffixes' that were added
|
|
|
738 by `jka-compr-installed'."
|
|
|
739 ;; Delete from inhibit-first-line-modes-suffixes
|
|
|
740 ;; what jka-compr-install added.
|
|
|
741 (mapcar
|
|
|
742 (function (lambda (x)
|
|
|
743 (and (jka-compr-info-strip-extension x)
|
|
|
744 (and (boundp 'inhibit-first-line-modes-suffixes)
|
|
|
745 (setq inhibit-first-line-modes-suffixes
|
|
|
746 (delete (jka-compr-info-regexp x)
|
|
|
747 inhibit-first-line-modes-suffixes)))))
|
|
|
748 )
|
|
|
749 jka-compr-compression-info-list)
|
|
|
750
|
|
|
751 (let* ((fnha (cons nil file-name-handler-alist))
|
|
|
752 (last fnha))
|
|
|
753
|
|
|
754 (while (cdr last)
|
|
|
755 (if (eq (cdr (car (cdr last))) 'jka-compr-handler)
|
|
|
756 (setcdr last (cdr (cdr last)))
|
|
|
757 (setq last (cdr last))))
|
|
|
758
|
|
|
759 (setq file-name-handler-alist (cdr fnha)))
|
|
|
760
|
|
|
761 (let* ((ama (cons nil auto-mode-alist))
|
|
|
762 (last ama)
|
|
|
763 entry)
|
|
|
764
|
|
|
765 (while (cdr last)
|
|
|
766 (setq entry (car (cdr last)))
|
|
|
767 (if (or (member entry jka-compr-mode-alist-additions)
|
|
|
768 (and (consp (cdr entry))
|
|
|
769 (eq (nth 2 entry) 'jka-compr)))
|
|
|
770 (setcdr last (cdr (cdr last)))
|
|
|
771 (setq last (cdr last))))
|
|
|
772
|
|
|
773 (setq auto-mode-alist (cdr ama))))
|
|
|
774
|
|
|
775
|
|
|
776 (defun jka-compr-installed-p ()
|
|
|
777 "Return non-nil if jka-compr is installed.
|
|
|
778 The return value is the entry in `file-name-handler-alist' for jka-compr."
|
|
|
779
|
|
|
780 (let ((fnha file-name-handler-alist)
|
|
|
781 (installed nil))
|
|
|
782
|
|
|
783 (while (and fnha (not installed))
|
|
|
784 (and (eq (cdr (car fnha)) 'jka-compr-handler)
|
|
|
785 (setq installed (car fnha)))
|
|
|
786 (setq fnha (cdr fnha)))
|
|
|
787
|
|
|
788 installed))
|
|
|
789
|
|
|
790
|
|
|
791 ;;; Add the file I/O hook if it does not already exist.
|
|
|
792 ;;; Make sure that jka-compr-file-name-handler-entry is eq to the
|
|
|
793 ;;; entry for jka-compr in file-name-handler-alist.
|
|
|
794 (and (jka-compr-installed-p)
|
|
|
795 (jka-compr-uninstall))
|
|
|
796
|
|
|
797 (jka-compr-install)
|
|
|
798
|
|
|
799
|
|
|
800 (provide 'jka-compr)
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801
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802 ;; jka-compr.el ends here.
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