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date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;;; dired-lisp.el - emulate Tree Dired's ls completely in Emacs Lisp
2
3 ;;;; READ THE WARNING BELOW BEFORE USING THIS PROGRAM!
4
5 (defconst dired-lisp-version (substring "!Revision: 1.8 !" 11 -2)
6 "!Id: dired-lisp.el,v 1.8 1992/05/01 17:50:56 sk Exp !")
7
8 ;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de>
9
10 ;; This program is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 1, or (at your option)
13 ;; any later version.
14 ;;
15 ;; This program is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
19 ;;
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with this program; if not, write to the Free Software
22 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 ;; LISPDIR ENTRY for the Elisp Archive ===============================
25 ;; LCD Archive Entry:
26 ;; dired-lisp|Sebastian Kremer|sk@thp.uni-koeln.de
27 ;; |emulate Tree Dired's ls completely in Emacs Lisp
28 ;; |Date: 1992/05/01 17:50:56 |Revision: 1.8 |
29
30 ;; INSTALLATION =======================================================
31 ;;
32 ;; Put this file into your load-path. Loading it will result in
33 ;; redefining function dired-ls to not call ls.
34
35 ;; You need tree dired from ftp.cs.buffalo.edu:pub/Emacs/diredall.tar.Z,
36 ;; classic (e.g. 18.57) dired.el will not work.
37
38 ;; OVERVIEW ===========================================================
39
40 ;; This file overloads tree dired so that all fileinfo is retrieved
41 ;; directly from Emacs lisp, without using an ls subprocess.
42
43 ;; Useful if you cannot afford to fork Emacs on a real memory UNIX,
44 ;; under VMS, or if you don't have the ls program, or if you want
45 ;; different format from what ls offers.
46
47 ;; Beware that if you change the output format of dired-ls, you'll
48 ;; have to change dired-move-to-filename and
49 ;; dired-move-to-end-of-filename as well.
50
51 ;; With this package is loaded, dired uses regexps instead of shell
52 ;; wildcards. If you enter regexps remember to double each $ sign.
53 ;; For example, to dired all elisp (*.el) files, enter `.*\.el$$',
54 ;; resulting in the regexp `.*\.el$'.
55
56 ;; WARNING ===========================================================
57
58 ;; With earlier version of this program I sometimes got an internal
59 ;; Emacs error:
60
61 ;; Signalling: (wrong-type-argument natnump #<EMACS BUG: ILLEGAL
62 ;; DATATYPE (#o37777777727) Save your buffers immediately and please
63 ;; report this bug>)
64
65 ;; The datatype differs (I also got #o67 once).
66
67 ;; Sometimes emacs just crashed with a fatal error.
68
69 ;; After I've avoided using directory-files and file-attributes
70 ;; together inside a mapcar, the bug didn't surface any longer.
71
72 ;; RESTRICTIONS =====================================================
73
74 ;; * many ls switches are ignored, see docstring of `dired-ls'.
75
76 ;; * In Emacs 18: cannot display date of file, displays a fake date
77 ;; "Jan 00 00:00" instead (dates do work in Emacs 19)
78
79 ;; * Only numeric uid/gid
80
81 ;; * if you load dired-lisp after ange-ftp, remote listings look
82 ;; really strange:
83 ;;
84 ;; total 1
85 ;; d????????? -1 -1 -1 -1 Jan 1 1970 .
86 ;; d????????? -1 -1 -1 -1 Jan 1 1970 ..
87 ;;
88 ;; This is because ange-ftp's file-attributes does not return much
89 ;; useful information.
90 ;;
91 ;; If you load dired-lisp first, there seem to be no problems.
92
93 ;; TODO ==============================================================
94
95 ;; Recognize some more ls switches: R F
96
97
98 (require 'dired) ; we will redefine dired-ls:
99 (or (fboundp 'dired-lisp-unix-ls)
100 (fset 'dired-lisp-unix-ls (symbol-function 'dired-ls)))
101
102 (fset 'dired-ls 'dired-lisp-ls)
103
104 (defun dired-lisp-ls (file &optional switches wildcard full-directory-p)
105 "dired-lisp.el's version of dired-ls.
106 Known switches: A a S r i s t
107 In Emacs 19, additional known switches are: c u
108 Others are ignored.
109
110 Insert ls output of FILE, optionally formatted with SWITCHES.
111 Optional third arg WILDCARD means treat non-directory part of FILE as
112 emacs regexp (_not_ a shell wildcard). If you enter regexps remember
113 to double each $ sign.
114
115 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
116 switches do not contain `d'.
117
118 SWITCHES default to dired-listing-switches."
119 (or switches (setq switches dired-listing-switches))
120 (or (consp switches) ; convert to list of chars
121 (setq switches (mapcar 'identity switches)))
122 (if wildcard
123 (setq wildcard (file-name-nondirectory file) ; actually emacs regexp
124 ;; perhaps convert it from shell to emacs syntax?
125 file (file-name-directory file)))
126 (if (or wildcard
127 full-directory-p)
128 (let* ((dir (file-name-as-directory file))
129 (default-directory dir);; so that file-attributes works
130 (sum 0)
131 elt
132 (file-list (directory-files dir nil wildcard))
133 file-alist
134 ;; do all bindings here for speed
135 fil attr)
136 (cond ((memq ?A switches)
137 (setq file-list
138 (dired-lisp-delete-matching "^\\.\\.?$" file-list)))
139 ((not (memq ?a switches))
140 ;; if neither -A nor -a, flush . files
141 (setq file-list
142 (dired-lisp-delete-matching "^\\." file-list))))
143 (setq file-alist
144 (mapcar
145 (function
146 (lambda (x)
147 ;; file-attributes("~bogus") bombs
148 (cons x (file-attributes (expand-file-name x)))))
149 ;; inserting the call to directory-files right here
150 ;; seems to stimulate an Emacs bug
151 ;; ILLEGAL DATATYPE (#o37777777727) or #o67
152 file-list))
153 (insert "total \007\n") ; filled in afterwards
154 (setq file-alist
155 (dired-lisp-handle-switches file-alist switches))
156 (while file-alist
157 (setq elt (car file-alist)
158 short (car elt)
159 attr (cdr elt)
160 file-alist (cdr file-alist)
161 fil (concat dir short)
162 sum (+ sum (nth 7 attr)))
163 (insert (dired-lisp-format short attr switches)))
164 ;; Fill in total size of all files:
165 (save-excursion
166 (search-backward "total \007")
167 (goto-char (match-end 0))
168 (delete-char -1)
169 (insert (format "%d" (1+ (/ sum 1024))))))
170 ;; if not full-directory-p, FILE *must not* end in /, as
171 ;; file-attributes will not recognize a symlink to a directory
172 ;; must make it a relative filename as ls does:
173 (setq file (file-name-nondirectory file))
174 (insert (dired-lisp-format file (file-attributes file) switches))))
175
176 (defun dired-lisp-delete-matching (regexp list)
177 ;; Delete all elements matching REGEXP from LIST, return new list.
178 ;; Should perhaps use setcdr for efficiency.
179 (let (result)
180 (while list
181 (or (string-match regexp (car list))
182 (setq result (cons (car list) result)))
183 (setq list (cdr list)))
184 result))
185
186 (defun dired-lisp-handle-switches (file-alist switches)
187 ;; FILE-ALIST's elements are (FILE . FILE-ATTRIBUTES).
188 ;; Return new alist sorted according to SWITCHES which is a list of
189 ;; characters. Default sorting is alphabetically.
190 (let (index)
191 (setq file-alist
192 (sort file-alist
193 (cond ((memq ?S switches) ; sorted on size
194 (function
195 (lambda (x y)
196 ;; 7th file attribute is file size
197 ;; Make largest file come first
198 (< (nth 7 (cdr y))
199 (nth 7 (cdr x))))))
200 ((memq ?t switches) ; sorted on time
201 (setq index (dired-lisp-time-index switches))
202 (function
203 (lambda (x y)
204 (time-lessp (nth index (cdr y))
205 (nth index (cdr x))))))
206 (t ; sorted alphabetically
207 (function
208 (lambda (x y)
209 (string-lessp (car x)
210 (car y)))))))))
211 (if (memq ?r switches) ; reverse sort order
212 (setq file-alist (nreverse file-alist)))
213 file-alist)
214
215 ;; From Roland McGrath. Can use this to sort on time.
216 (defun time-lessp (time0 time1)
217 (let ((hi0 (car time0))
218 (hi1 (car time1))
219 (lo0 (car (cdr time0)))
220 (lo1 (car (cdr time1))))
221 (or (< hi0 hi1)
222 (and (= hi0 hi1)
223 (< lo0 lo1)))))
224
225
226 (defun dired-lisp-format (file-name file-attr &optional switches)
227 (let ((file-type (nth 0 file-attr)))
228 (concat (if (memq ?i switches) ; inode number
229 (format "%6d " (nth 10 file-attr)))
230 ;; nil is treated like "" in concat
231 (if (memq ?s switches) ; size in K
232 (format "%4d " (1+ (/ (nth 7 file-attr) 1024))))
233 (nth 8 file-attr) ; permission bits
234 ;; numeric uid/gid are more confusing than helpful
235 ;; Emacs should be able to make strings of them.
236 ;; user-login-name and user-full-name could take an
237 ;; optional arg.
238 (format " %3d %-8d %-8d %8d "
239 (nth 1 file-attr) ; no. of links
240 (nth 2 file-attr) ; uid
241 (nth 3 file-attr) ; gid
242 (nth 7 file-attr) ; size in bytes
243 )
244 (dired-lisp-format-time file-attr switches)
245 " "
246 file-name
247 (if (stringp file-type) ; is a symbolic link
248 (concat " -> " file-type)
249 "")
250 "\n"
251 )))
252
253 (defun dired-lisp-time-index (switches)
254 ;; Return index into file-attributes according to ls SWITCHES.
255 (cond
256 ((memq ?c switches) 6) ; last mode change
257 ((memq ?u switches) 4) ; last access
258 ;; default is last modtime
259 (t 5)))
260
261 (defun dired-lisp-format-time (file-attr switches)
262 ;; Format time string for file with attributes FILE-ATTR according
263 ;; to SWITCHES (a list of ls option letters of which c and u are recognized).
264 ;; file-attributes's time is in a braindead format
265 ;; Emacs 19 can format it using a new optional argument to
266 ;; current-time-string, for Emacs 18 we just return the faked fixed
267 ;; date "Jan 00 00:00 ".
268 (condition-case error-data
269 (let* ((time (current-time-string
270 (nth (dired-lisp-time-index switches) file-attr)))
271 (date (substring time 4 11)) ; "Apr 30 "
272 (clock (substring time 11 16)) ; "11:27"
273 (year (substring time 19 24)) ; " 1992"
274 (same-year (equal year (substring (current-time-string) 19 24))))
275 (concat date ; has trailing SPC
276 (if same-year
277 ;; this is not exactly the same test used by ls
278 ;; ls tests if the file is older than 6 months
279 ;; but we can't do time differences easily
280 clock
281 year)))
282 (error
283 "Jan 00 00:00")))
284
285 (provide 'dired-lisp)