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1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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2 ;;
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3 ;; File: dired-cmpr.el
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4 ;; Dired Version: #Revision: 7.9 $
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5 ;; RCS:
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6 ;; Description: Commands for compressing marked files.
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7 ;;
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8 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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9
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10 ;;; Requirements and provisions
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11 (provide 'dired-cmpr)
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12 (require 'dired)
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13
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14 ;;; Entry points.
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15
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16 (defun dired-do-compress (&optional arg files)
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17 "Compress or uncompress marked (or next ARG) files.
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18 With a zero prefix, prompts for a new value of `dired-compression-method'."
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19 (interactive
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20 (let ((arg (prefix-numeric-value current-prefix-arg))
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21 files)
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22 (if (zerop arg)
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23 (let ((new (completing-read
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24 (format "Set compression method (currently %s): "
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25 dired-compression-method)
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26 (mapcar
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27 (function
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28 (lambda (x)
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29 (cons (symbol-name (car x)) nil)))
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30 dired-compression-method-alist)
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31 nil t)))
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32 (or (string-equal new "")
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33 (setq dired-compression-method (intern new))))
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34 (setq files (dired-get-marked-files nil current-prefix-arg))
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35 (or (memq 'compress dired-no-confirm)
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36 (let* ((dir (dired-current-directory))
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37 (rfiles (mapcar (function
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38 (lambda (fn)
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39 (dired-make-relative fn dir t)))
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40 files))
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41 (prompt "")
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42 (comp 0)
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43 (uncomp nil)
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44 (total (length files))
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45 elt)
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46 (mapcar (function
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47 (lambda (fn)
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48 (if (listp (setq elt
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49 (dired-make-compressed-filename fn)))
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50 (let* ((method (car (nth 3 elt)))
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51 (count (assoc method uncomp)))
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52 (if count
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53 (setcdr count (1+ (cdr count)))
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54 (setq uncomp (cons (cons method 1) uncomp))))
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55 (setq comp (1+ comp)))))
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56 files)
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57 (if (/= comp 0)
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58 (setq prompt
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59 (format "%s %d"
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60 (car
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61 (nth 2
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62 (assq dired-compression-method
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63 dired-compression-method-alist)))
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64 comp)))
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65 (if uncomp
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66 (let ((case-fold-search t)
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67 method)
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68 (or (string-equal prompt "")
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69 (setq prompt (concat prompt "; ")))
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70 (setq uncomp
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71 (sort
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72 (mapcar
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73 (function
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74 (lambda (elt)
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75 (setq method (car elt))
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76 (if (string-equal method "gzip")
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77 (setq method "gunzip")
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78 (or (string-match "^un" method)
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79 (setq method (concat "un" method))))
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80 (setcar elt method)
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81 elt))
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82 uncomp)
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83 (function
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84 (lambda (x y)
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85 (string< (car x) (car y))))))
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86 (setq prompt
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87 (concat prompt
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88 (mapconcat
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89 (function
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90 (lambda (elt)
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91 (format "%s %d" (car elt) (cdr elt))))
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92 uncomp ", ")))))
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93 (cond
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94 ((= (length rfiles) 1)
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95 (setq prompt (format "%s %s? "
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96 ;; Don't need the number 1
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97 (substring prompt 0 -2)
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98 (car rfiles))))
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99 ((or (> (length uncomp) 1) (and (/= 0 comp) uncomp))
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100 (setq prompt (format "%s? Total: %d file%s " prompt total
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101 (dired-plural-s total))))
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102 ((setq prompt (format "%s file%s? " prompt
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103 (dired-plural-s total)))))
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104 (or (dired-mark-pop-up nil 'compress rfiles 'y-or-n-p prompt)
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105 (setq arg 0)))))
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106 (list arg files)))
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107
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108 (if (not (zerop arg))
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109 (dired-create-files
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110 'dired-compress-file
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111 "Compress or Uncompress"
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112 files
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113 (function
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114 (lambda (fn)
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115 (let ((cfn (dired-make-compressed-filename fn)))
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116 (if (stringp cfn)
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117 cfn
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118 (substring fn 0 (- (length (nth 1 cfn))))))))
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119 dired-keep-marker-compress nil t)))
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120
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121 (defun dired-compress-subdir-files (&optional uncompress)
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122 "Compress all uncompressed files in the current subdirectory.
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123 With a prefix argument uncompresses all compressed files."
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124 (interactive "P")
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125 (let ((dir (dired-current-directory))
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126 files methods uncomp elt)
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127 (save-excursion
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128 (save-restriction
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129 (narrow-to-region (dired-subdir-min) (dired-subdir-max))
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130 (dired-map-dired-file-lines
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131 (function
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132 (lambda (f)
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133 (if uncompress
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134 (and (listp (setq uncomp (dired-make-compressed-filename f)))
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135 (let ((program (car (nth 3 uncomp))))
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136 (setq files (cons f files))
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137 (if (setq elt (assoc program methods))
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138 (setcdr elt (1+ (cdr elt)))
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139 (setq methods (cons (cons program 1) methods)))))
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140 (and (stringp (dired-make-compressed-filename f))
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141 (setq files (cons f files)))))))))
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142 (if files
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143 (let ((total (length files))
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144 (rfiles (mapcar
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145 (function
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146 (lambda (fn)
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147 (dired-make-relative fn dir t)))
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148 files))
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149 prompt)
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150 (if uncompress
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151 (progn
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152 (setq prompt (mapconcat
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153 (function
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154 (lambda (x)
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155 (format "%s %d"
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156 (if (string-equal (car x) "gzip")
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157 "gunzip"
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158 (if (string-match "^un" (car x))
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159 (car x)
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160 (concat "un" (car x))))
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161 (cdr x))))
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162 methods ", "))
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163 (cond
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164 ((= total 1)
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165 (setq prompt
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166 (concat (substring prompt 0 -1) (car rfiles) "? ")))
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167 ((= (length methods) 1)
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168 (setq prompt
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169 (format "%s file%s? " prompt (dired-plural-s total))))
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170 (t
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171 (setq prompt (format "%s? Total: %d file%s " prompt total
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172 (dired-plural-s total))))))
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173 (setq prompt
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174 (if (= total 1)
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175 (format "%s %s? " dired-compression-method (car rfiles))
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176 (format "%s %d file%s? "
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177 dired-compression-method total
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178 (dired-plural-s total)))))
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179 (if (dired-mark-pop-up nil 'compress rfiles 'y-or-n-p prompt)
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180 (dired-create-files
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181 'dired-compress-file
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182 "Compress or Uncompress"
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183 files
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184 (function
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185 (lambda (fn)
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186 (let ((cfn (dired-make-compressed-filename fn)))
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187 (if (stringp cfn)
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188 cfn
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189 (substring fn 0 (- (length (nth 1 cfn))))))))
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190 dired-keep-marker-compress nil t)))
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191 (message "No files need %scompressing in %s."
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192 (if uncompress "un" "")
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193 (dired-abbreviate-file-name dir)))))
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194
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195 (defun dired-compress-file (file ok-flag)
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196 ;; Compress or uncompress FILE.
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197 ;; If ok-flag is non-nil, it is OK to overwrite an existing
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198 ;; file. How well this actually works may depend on the compression
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199 ;; program.
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200 ;; Return the name of the compressed or uncompressed file.
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201 (let ((handler (find-file-name-handler file 'dired-compress-file)))
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202 (if handler
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203 (funcall handler 'dired-compress-file file ok-flag)
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204 (let ((compressed-fn (dired-make-compressed-filename file))
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205 (err-buff (get-buffer-create " *dired-check-process output*")))
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206 (save-excursion
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207 (set-buffer err-buff)
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208 (erase-buffer)
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209 (cond ((file-symlink-p file)
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210 (signal 'file-error (list "Error compressing file"
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211 file "a symbolic link")))
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212 ((listp compressed-fn)
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213 (message "Uncompressing %s..." file)
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214 (let* ((data (nth 3 compressed-fn))
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215 (ret
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216 (apply 'call-process
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217 (car data) file t nil
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218 (append (cdr data)
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219 (and ok-flag
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220 (list (nth 4 compressed-fn)))
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221 (list file)))))
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222 (if (or (and (integerp ret) (/= ret 0))
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223 (not (bobp)))
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224 (signal 'file-error
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225 (nconc
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226 (list "Error uncompressing file"
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227 file)
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228 (and (not (bobp))
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229 (list
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230 (progn
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231 (goto-char (point-min))
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232 (buffer-substring
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233 (point) (progn (end-of-line)
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234 (point))))))))))
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235 (message "Uncompressing %s...done" file)
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236 (dired-remove-file file)
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237 (let ((to (substring file 0
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238 (- (length (nth 1 compressed-fn))))))
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239 ;; rename any buffers
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240 (and (get-file-buffer file)
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241 (save-excursion
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242 (set-buffer (get-file-buffer file))
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243 (let ((modflag (buffer-modified-p)))
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244 ;; kills write-file-hooks
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245 (set-visited-file-name to)
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246 (set-buffer-modified-p modflag))))
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247 to))
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248 ((stringp compressed-fn)
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249 (message "Compressing %s..." file)
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250 (let* ((data (assq dired-compression-method
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251 dired-compression-method-alist))
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252 (compr-args (nth 2 data))
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253 (ret
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254 (apply 'call-process
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255 (car compr-args) file t nil
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256 (append (cdr compr-args)
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257 (and ok-flag
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258 (list (nth 4 data)))
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259 (list file)))))
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260 (if (or (and (integerp ret) (/= ret 0))
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261 (not (bobp)))
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262 (signal 'file-error
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263 (nconc
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264 (list "Error compressing file"
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265 file)
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266 (and (not (bobp))
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267 (list
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268 (progn
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269 (goto-char (point-min))
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270 (buffer-substring
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271 (point) (progn (end-of-line)
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272 (point))))))))))
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273 (message "Compressing %s...done" file)
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274 (dired-remove-file file)
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275 ;; rename any buffers
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276 (and (get-file-buffer file)
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277 (save-excursion
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278 (set-buffer (get-file-buffer file))
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279 (let ((modflag (buffer-modified-p)))
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280 ;; kills write-file-hooks
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281 (set-visited-file-name compressed-fn)
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282 (set-buffer-modified-p modflag))))
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283 compressed-fn)
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284 (t (error "Strange error in dired-compress-file."))))))))
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285
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286 (defun dired-make-compressed-filename (name &optional method)
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287 ;; If NAME is in the syntax of a compressed file (according to
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288 ;; dired-compression-method-alist), return the data (a list) from this
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289 ;; alist on how to uncompress it. Otherwise, return a string, the
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290 ;; compressed form of this file name. This is computed using the optional
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291 ;; argument METHOD (a symbol). If METHOD is nil, the ambient value of
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292 ;; dired-compression-method is used.
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293 (let ((handler (find-file-name-handler
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294 name 'dired-make-compressed-filename)))
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295 (if handler
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296 (funcall handler 'dired-make-compressed-filename name method)
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297 (let ((alist dired-compression-method-alist)
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298 (len (length name))
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299 ext ext-len result)
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300 (while alist
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301 (if (and (> len
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302 (setq ext-len (length (setq ext (nth 1 (car alist))))))
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303 (string-equal ext (substring name (- ext-len))))
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304 (setq result (car alist)
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305 alist nil)
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306 (setq alist (cdr alist))))
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307 (or result
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308 (concat name
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309 (nth 1 (or (assq (or method dired-compression-method)
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310 dired-compression-method-alist)
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311 (error "Unknown compression method: %s"
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312 (or method dired-compression-method))))))
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313 ))))
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314
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315 ;;; end of dired-cmpr.el
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