1 ;;; ls-lisp.el --- emulate insert-directory completely in Emacs Lisp
3 ;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
6 ;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de>
8 ;; This program is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 1, or (at your option)
13 ;; This program is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with this program; if not, write to the Free Software
20 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 ;; INSTALLATION =======================================================
24 ;; Put this file into your load-path. To use it, load it
25 ;; with (load "ls-lisp").
27 ;; OVERVIEW ===========================================================
29 ;; This file overloads the function insert-directory to implement it
30 ;; directly from Emacs lisp, without running `ls' in a subprocess.
32 ;; It is useful if you cannot afford to fork Emacs on a real memory UNIX,
33 ;; under VMS, or if you don't have the ls program, or if you want
34 ;; different format from what ls offers.
36 ;; This function uses regexps instead of shell
37 ;; wildcards. If you enter regexps remember to double each $ sign.
38 ;; For example, to include files *.el, enter `.*\.el$$',
39 ;; resulting in the regexp `.*\.el$'.
41 ;; RESTRICTIONS =====================================================
43 ;; * many ls switches are ignored, see docstring of `insert-directory'.
45 ;; * Only numeric uid/gid
47 ;; TODO ==============================================================
49 ;; Recognize some more ls switches: R F
53 (defun insert-directory (file &optional switches wildcard full-directory-p
)
54 "Insert directory listing for of FILE, formatted according to SWITCHES.
55 Leaves point after the inserted text.
56 Optional third arg WILDCARD means treat FILE as shell wildcard.
57 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
58 switches do not contain `d', so that a full listing is expected.
60 This version of the function comes from `ls-lisp.el'.
61 It does not support ordinary shell wildcards; instead, it allows
62 regular expressions to match file names.
64 The switches that work are: A a c i r S s t u"
65 (let ((handler (find-file-name-handler file
)))
67 (funcall handler
'insert-directory file switches
68 wildcard full-directory-p
)
69 ;; Convert SWITCHES to a list of characters.
70 (setq switches
(append switches nil
))
72 (setq wildcard
(file-name-nondirectory file
) ; actually emacs regexp
73 ;; perhaps convert it from shell to emacs syntax?
74 file
(file-name-directory file
)))
77 (let* ((dir (file-name-as-directory file
))
78 (default-directory dir
);; so that file-attributes works
82 (file-list (directory-files dir nil wildcard
))
84 ;; do all bindings here for speed
86 (cond ((memq ?A switches
)
88 (ls-lisp-delete-matching "^\\.\\.?$" file-list
)))
89 ((not (memq ?a switches
))
90 ;; if neither -A nor -a, flush . files
92 (ls-lisp-delete-matching "^\\." file-list
))))
97 ;; file-attributes("~bogus") bombs
98 (cons x
(file-attributes (expand-file-name x
)))))
99 ;; inserting the call to directory-files right here
100 ;; seems to stimulate an Emacs bug
101 ;; ILLEGAL DATATYPE (#o37777777727) or #o67
103 (insert "total \007\n") ; filled in afterwards
105 (ls-lisp-handle-switches file-alist switches
))
107 (setq elt
(car file-alist
)
110 file-alist
(cdr file-alist
)
111 fil
(concat dir short
)
112 sum
(+ sum
(nth 7 attr
)))
113 (insert (ls-lisp-format short attr switches
)))
114 ;; Fill in total size of all files:
116 (search-backward "total \007")
117 (goto-char (match-end 0))
119 (insert (format "%d" (1+ (/ sum
1024))))))
120 ;; if not full-directory-p, FILE *must not* end in /, as
121 ;; file-attributes will not recognize a symlink to a directory
122 ;; must make it a relative filename as ls does:
123 (setq file
(file-name-nondirectory file
))
124 (insert (ls-lisp-format file
(file-attributes file
) switches
))))))
126 (defun ls-lisp-delete-matching (regexp list
)
127 ;; Delete all elements matching REGEXP from LIST, return new list.
128 ;; Should perhaps use setcdr for efficiency.
131 (or (string-match regexp
(car list
))
132 (setq result
(cons (car list
) result
)))
133 (setq list
(cdr list
)))
136 (defun ls-lisp-handle-switches (file-alist switches
)
137 ;; FILE-ALIST's elements are (FILE . FILE-ATTRIBUTES).
138 ;; Return new alist sorted according to SWITCHES which is a list of
139 ;; characters. Default sorting is alphabetically.
143 (cond ((memq ?S switches
) ; sorted on size
146 ;; 7th file attribute is file size
147 ;; Make largest file come first
150 ((memq ?t switches
) ; sorted on time
151 (setq index
(ls-lisp-time-index switches
))
154 (ls-lisp-time-lessp (nth index
(cdr y
))
155 (nth index
(cdr x
))))))
156 (t ; sorted alphabetically
159 (string-lessp (car x
)
161 (if (memq ?r switches
) ; reverse sort order
162 (setq file-alist
(nreverse file-alist
)))
165 ;; From Roland McGrath. Can use this to sort on time.
166 (defun ls-lisp-time-lessp (time0 time1
)
167 (let ((hi0 (car time0
))
169 (lo0 (car (cdr time0
)))
170 (lo1 (car (cdr time1
))))
176 (defun ls-lisp-format (file-name file-attr
&optional switches
)
177 (let ((file-type (nth 0 file-attr
)))
178 (concat (if (memq ?i switches
) ; inode number
179 (format "%6d " (nth 10 file-attr
)))
180 ;; nil is treated like "" in concat
181 (if (memq ?s switches
) ; size in K
182 (format "%4d " (1+ (/ (nth 7 file-attr
) 1024))))
183 (nth 8 file-attr
) ; permission bits
184 ;; numeric uid/gid are more confusing than helpful
185 ;; Emacs should be able to make strings of them.
186 ;; user-login-name and user-full-name could take an
188 (format " %3d %-8d %-8d %8d "
189 (nth 1 file-attr
) ; no. of links
190 (if (= (user-uid) (nth 2 file-attr
))
192 (nth 2 file-attr
)) ; uid
193 (if (eq system-type
'ms-dos
)
194 "root" ; everything is root on MSDOS.
195 (nth 3 file-attr
)) ; gid
196 (nth 7 file-attr
) ; size in bytes
198 (ls-lisp-format-time file-attr switches
)
201 (if (stringp file-type
) ; is a symbolic link
202 (concat " -> " file-type
)
207 (defun ls-lisp-time-index (switches)
208 ;; Return index into file-attributes according to ls SWITCHES.
210 ((memq ?c switches
) 6) ; last mode change
211 ((memq ?u switches
) 4) ; last access
212 ;; default is last modtime
215 (defun ls-lisp-format-time (file-attr switches
)
216 ;; Format time string for file with attributes FILE-ATTR according
217 ;; to SWITCHES (a list of ls option letters of which c and u are recognized).
218 ;; file-attributes's time is in a braindead format
219 ;; Emacs 19 can format it using a new optional argument to
220 ;; current-time-string, for Emacs 18 we just return the faked fixed
221 ;; date "Jan 00 00:00 ".
222 (condition-case error-data
223 (let* ((time (current-time-string
224 (nth (ls-lisp-time-index switches
) file-attr
)))
225 (date (substring time
4 11)) ; "Apr 30 "
226 (clock (substring time
11 16)) ; "11:27"
227 (year (substring time
19 24)) ; " 1992"
228 (same-year (equal year
(substring (current-time-string) 19 24))))
229 (concat date
; has trailing SPC
231 ;; this is not exactly the same test used by ls
232 ;; ls tests if the file is older than 6 months
233 ;; but we can't do time differences easily
241 ;;; ls-lisp.el ends here