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1 ;;;; dired-lisp.el - emulate Tree Dired's ls completely in Emacs Lisp
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2
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3 ;;;; READ THE WARNING BELOW BEFORE USING THIS PROGRAM!
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4
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5 (defconst dired-lisp-version (substring "!Revision: 1.8 !" 11 -2)
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6 "!Id: dired-lisp.el,v 1.8 1992/05/01 17:50:56 sk Exp !")
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7
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8 ;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de>
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9
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10 ;; This program is free software; you can redistribute it and/or modify
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11 ;; it under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 1, or (at your option)
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13 ;; any later version.
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14 ;;
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15 ;; This program is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU 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 this program; if not, write to the Free Software
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22 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;; LISPDIR ENTRY for the Elisp Archive ===============================
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25 ;; LCD Archive Entry:
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26 ;; dired-lisp|Sebastian Kremer|sk@thp.uni-koeln.de
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27 ;; |emulate Tree Dired's ls completely in Emacs Lisp
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28 ;; |Date: 1992/05/01 17:50:56 |Revision: 1.8 |
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29
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30 ;; INSTALLATION =======================================================
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31 ;;
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32 ;; Put this file into your load-path. Loading it will result in
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33 ;; redefining function dired-ls to not call ls.
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34
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35 ;; You need tree dired from ftp.cs.buffalo.edu:pub/Emacs/diredall.tar.Z,
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36 ;; classic (e.g. 18.57) dired.el will not work.
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37
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38 ;; OVERVIEW ===========================================================
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39
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40 ;; This file overloads tree dired so that all fileinfo is retrieved
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41 ;; directly from Emacs lisp, without using an ls subprocess.
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42
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43 ;; Useful if you cannot afford to fork Emacs on a real memory UNIX,
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44 ;; under VMS, or if you don't have the ls program, or if you want
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45 ;; different format from what ls offers.
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46
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47 ;; Beware that if you change the output format of dired-ls, you'll
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48 ;; have to change dired-move-to-filename and
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49 ;; dired-move-to-end-of-filename as well.
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50
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51 ;; With this package is loaded, dired uses regexps instead of shell
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52 ;; wildcards. If you enter regexps remember to double each $ sign.
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53 ;; For example, to dired all elisp (*.el) files, enter `.*\.el$$',
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54 ;; resulting in the regexp `.*\.el$'.
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55
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56 ;; WARNING ===========================================================
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57
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58 ;; With earlier version of this program I sometimes got an internal
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59 ;; Emacs error:
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60
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61 ;; Signalling: (wrong-type-argument natnump #<EMACS BUG: ILLEGAL
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62 ;; DATATYPE (#o37777777727) Save your buffers immediately and please
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63 ;; report this bug>)
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64
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65 ;; The datatype differs (I also got #o67 once).
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66
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67 ;; Sometimes emacs just crashed with a fatal error.
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68
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69 ;; After I've avoided using directory-files and file-attributes
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70 ;; together inside a mapcar, the bug didn't surface any longer.
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71
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72 ;; RESTRICTIONS =====================================================
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73
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74 ;; * many ls switches are ignored, see docstring of `dired-ls'.
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75
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76 ;; * In Emacs 18: cannot display date of file, displays a fake date
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77 ;; "Jan 00 00:00" instead (dates do work in Emacs 19)
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78
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79 ;; * Only numeric uid/gid
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80
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81 ;; * if you load dired-lisp after ange-ftp, remote listings look
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82 ;; really strange:
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83 ;;
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84 ;; total 1
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85 ;; d????????? -1 -1 -1 -1 Jan 1 1970 .
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86 ;; d????????? -1 -1 -1 -1 Jan 1 1970 ..
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87 ;;
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88 ;; This is because ange-ftp's file-attributes does not return much
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89 ;; useful information.
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90 ;;
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91 ;; If you load dired-lisp first, there seem to be no problems.
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92
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93 ;; TODO ==============================================================
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94
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95 ;; Recognize some more ls switches: R F
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96
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97
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98 (require 'dired) ; we will redefine dired-ls:
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99 (or (fboundp 'dired-lisp-unix-ls)
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100 (fset 'dired-lisp-unix-ls (symbol-function 'dired-ls)))
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101
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102 (fset 'dired-ls 'dired-lisp-ls)
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103
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104 (defun dired-lisp-ls (file &optional switches wildcard full-directory-p)
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105 "dired-lisp.el's version of dired-ls.
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106 Known switches: A a S r i s t
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107 In Emacs 19, additional known switches are: c u
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108 Others are ignored.
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109
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110 Insert ls output of FILE, optionally formatted with SWITCHES.
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111 Optional third arg WILDCARD means treat non-directory part of FILE as
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112 emacs regexp (_not_ a shell wildcard). If you enter regexps remember
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113 to double each $ sign.
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114
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115 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
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116 switches do not contain `d'.
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117
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118 SWITCHES default to dired-listing-switches."
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119 (or switches (setq switches dired-listing-switches))
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120 (or (consp switches) ; convert to list of chars
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121 (setq switches (mapcar 'identity switches)))
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122 (if wildcard
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123 (setq wildcard (file-name-nondirectory file) ; actually emacs regexp
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124 ;; perhaps convert it from shell to emacs syntax?
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125 file (file-name-directory file)))
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126 (if (or wildcard
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127 full-directory-p)
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128 (let* ((dir (file-name-as-directory file))
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129 (default-directory dir);; so that file-attributes works
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130 (sum 0)
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131 elt
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132 (file-list (directory-files dir nil wildcard))
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133 file-alist
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134 ;; do all bindings here for speed
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135 fil attr)
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136 (cond ((memq ?A switches)
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137 (setq file-list
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138 (dired-lisp-delete-matching "^\\.\\.?$" file-list)))
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139 ((not (memq ?a switches))
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140 ;; if neither -A nor -a, flush . files
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141 (setq file-list
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142 (dired-lisp-delete-matching "^\\." file-list))))
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143 (setq file-alist
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144 (mapcar
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145 (function
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146 (lambda (x)
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147 ;; file-attributes("~bogus") bombs
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148 (cons x (file-attributes (expand-file-name x)))))
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149 ;; inserting the call to directory-files right here
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150 ;; seems to stimulate an Emacs bug
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151 ;; ILLEGAL DATATYPE (#o37777777727) or #o67
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152 file-list))
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153 (insert "total \007\n") ; filled in afterwards
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154 (setq file-alist
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155 (dired-lisp-handle-switches file-alist switches))
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156 (while file-alist
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157 (setq elt (car file-alist)
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158 short (car elt)
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159 attr (cdr elt)
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160 file-alist (cdr file-alist)
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161 fil (concat dir short)
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162 sum (+ sum (nth 7 attr)))
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163 (insert (dired-lisp-format short attr switches)))
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164 ;; Fill in total size of all files:
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165 (save-excursion
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166 (search-backward "total \007")
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167 (goto-char (match-end 0))
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168 (delete-char -1)
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169 (insert (format "%d" (1+ (/ sum 1024))))))
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170 ;; if not full-directory-p, FILE *must not* end in /, as
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171 ;; file-attributes will not recognize a symlink to a directory
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172 ;; must make it a relative filename as ls does:
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173 (setq file (file-name-nondirectory file))
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174 (insert (dired-lisp-format file (file-attributes file) switches))))
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175
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176 (defun dired-lisp-delete-matching (regexp list)
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177 ;; Delete all elements matching REGEXP from LIST, return new list.
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178 ;; Should perhaps use setcdr for efficiency.
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179 (let (result)
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180 (while list
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181 (or (string-match regexp (car list))
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182 (setq result (cons (car list) result)))
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183 (setq list (cdr list)))
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184 result))
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185
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186 (defun dired-lisp-handle-switches (file-alist switches)
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187 ;; FILE-ALIST's elements are (FILE . FILE-ATTRIBUTES).
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188 ;; Return new alist sorted according to SWITCHES which is a list of
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189 ;; characters. Default sorting is alphabetically.
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190 (let (index)
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191 (setq file-alist
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192 (sort file-alist
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193 (cond ((memq ?S switches) ; sorted on size
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194 (function
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195 (lambda (x y)
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196 ;; 7th file attribute is file size
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197 ;; Make largest file come first
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198 (< (nth 7 (cdr y))
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199 (nth 7 (cdr x))))))
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200 ((memq ?t switches) ; sorted on time
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201 (setq index (dired-lisp-time-index switches))
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202 (function
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203 (lambda (x y)
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204 (time-lessp (nth index (cdr y))
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205 (nth index (cdr x))))))
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206 (t ; sorted alphabetically
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207 (function
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208 (lambda (x y)
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209 (string-lessp (car x)
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210 (car y)))))))))
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211 (if (memq ?r switches) ; reverse sort order
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212 (setq file-alist (nreverse file-alist)))
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213 file-alist)
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214
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215 ;; From Roland McGrath. Can use this to sort on time.
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216 (defun time-lessp (time0 time1)
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217 (let ((hi0 (car time0))
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218 (hi1 (car time1))
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219 (lo0 (car (cdr time0)))
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220 (lo1 (car (cdr time1))))
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221 (or (< hi0 hi1)
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222 (and (= hi0 hi1)
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223 (< lo0 lo1)))))
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224
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225
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226 (defun dired-lisp-format (file-name file-attr &optional switches)
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227 (let ((file-type (nth 0 file-attr)))
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228 (concat (if (memq ?i switches) ; inode number
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229 (format "%6d " (nth 10 file-attr)))
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230 ;; nil is treated like "" in concat
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231 (if (memq ?s switches) ; size in K
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232 (format "%4d " (1+ (/ (nth 7 file-attr) 1024))))
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233 (nth 8 file-attr) ; permission bits
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234 ;; numeric uid/gid are more confusing than helpful
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235 ;; Emacs should be able to make strings of them.
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236 ;; user-login-name and user-full-name could take an
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237 ;; optional arg.
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238 (format " %3d %-8d %-8d %8d "
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239 (nth 1 file-attr) ; no. of links
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240 (nth 2 file-attr) ; uid
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241 (nth 3 file-attr) ; gid
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242 (nth 7 file-attr) ; size in bytes
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243 )
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244 (dired-lisp-format-time file-attr switches)
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245 " "
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246 file-name
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247 (if (stringp file-type) ; is a symbolic link
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248 (concat " -> " file-type)
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249 "")
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250 "\n"
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251 )))
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252
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253 (defun dired-lisp-time-index (switches)
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254 ;; Return index into file-attributes according to ls SWITCHES.
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255 (cond
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256 ((memq ?c switches) 6) ; last mode change
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257 ((memq ?u switches) 4) ; last access
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258 ;; default is last modtime
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259 (t 5)))
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260
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261 (defun dired-lisp-format-time (file-attr switches)
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262 ;; Format time string for file with attributes FILE-ATTR according
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263 ;; to SWITCHES (a list of ls option letters of which c and u are recognized).
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264 ;; file-attributes's time is in a braindead format
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265 ;; Emacs 19 can format it using a new optional argument to
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266 ;; current-time-string, for Emacs 18 we just return the faked fixed
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267 ;; date "Jan 00 00:00 ".
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268 (condition-case error-data
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269 (let* ((time (current-time-string
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270 (nth (dired-lisp-time-index switches) file-attr)))
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271 (date (substring time 4 11)) ; "Apr 30 "
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272 (clock (substring time 11 16)) ; "11:27"
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273 (year (substring time 19 24)) ; " 1992"
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274 (same-year (equal year (substring (current-time-string) 19 24))))
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275 (concat date ; has trailing SPC
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276 (if same-year
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277 ;; this is not exactly the same test used by ls
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278 ;; ls tests if the file is older than 6 months
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279 ;; but we can't do time differences easily
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280 clock
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281 year)))
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282 (error
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283 "Jan 00 00:00")))
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284
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285 (provide 'dired-lisp)
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