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;;;; dired-lisp.el - emulate Tree Dired's ls completely in Emacs Lisp
;;;; READ THE WARNING BELOW BEFORE USING THIS PROGRAM!
(defconst dired-lisp-version (substring "$Revision: 1.7 $" 11 -2)
"$Id: dired-lisp.el,v 1.7 1992/04/30 10:37:15 sk Exp sk $")
;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de>
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 1, or (at your option)
;; any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, write to the Free Software
;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;; LISPDIR ENTRY for the Elisp Archive ===============================
;; LCD Archive Entry:
;; dired-lisp|Sebastian Kremer|sk@thp.uni-koeln.de
;; |emulate Tree Dired's ls completely in Emacs Lisp
;; |$Date: 1992/04/30 10:37:15 $|$Revision: 1.7 $|
;; INSTALLATION =======================================================
;;
;; Put this file into your load-path. Loading it will result in
;; redefining function dired-ls to not call ls.
;; You need tree dired from ftp.cs.buffalo.edu:pub/Emacs/diredall.tar.Z,
;; classic (e.g. 18.57) dired.el will not work.
;; OVERVIEW ===========================================================
;; This file overloads tree dired so that all fileinfo is retrieved
;; directly from Emacs lisp, without using an ls subprocess.
;; Useful if you cannot afford to fork Emacs on a real memory UNIX,
;; under VMS, or if you don't have the ls program, or if you want
;; different format from what ls offers.
;; Beware that if you change the output format of dired-ls, you'll
;; have to change dired-move-to-filename and
;; dired-move-to-end-of-filename as well.
;; With this package is loaded, dired uses regexps instead of shell
;; wildcards. If you enter regexps remember to double each $ sign.
;; For example, to dired all elisp (*.el) files, enter `.*\.el$$',
;; resulting in the regexp `.*\.el$'.
;; WARNING ===========================================================
;; With earlier version of this program I sometimes got an internal
;; Emacs error:
;; Signalling: (wrong-type-argument natnump #<EMACS BUG: ILLEGAL
;; DATATYPE (#o37777777727) Save your buffers immediately and please
;; report this bug>)
;; The datatype differs (I also got #o67 once).
;; Sometimes emacs just crashed with a fatal error.
;; After I've avoided using directory-files and file-attributes
;; together inside a mapcar, the bug didn't surface any longer.
;; RESTRICTIONS =====================================================
;; * many ls switches are ignored, see docstring of `dired-ls'.
;; * In Emacs 18: cannot display date of file, displays a fake date
;; "Jan 00 00:00" instead (dates do work in Emacs 19)
;; * Only numeric uid/gid
;; * if you load dired-lisp after ange-ftp, remote listings look
;; really strange:
;;
;; total 1
;; d????????? -1 -1 -1 -1 Jan 1 1970 .
;; d????????? -1 -1 -1 -1 Jan 1 1970 ..
;;
;; This is because ange-ftp's file-attributes does not return much
;; useful information.
;;
;; If you load dired-lisp first, there seem to be no problems.
;; TODO ==============================================================
;; Recognize some more ls switches: R F
(require 'dired) ; we will redefine dired-ls:
(or (fboundp 'dired-lisp-unix-ls)
(fset 'dired-lisp-unix-ls (symbol-function 'dired-ls)))
(fset 'dired-ls 'dired-lisp-ls)
(defun dired-lisp-ls (file &optional switches wildcard full-directory-p)
"dired-lisp.el's version of dired-ls.
Known switches: A a S r i s t
In Emacs 19, additional known switches are: c u
Others are ignored.
Insert ls output of FILE, optionally formatted with SWITCHES.
Optional third arg WILDCARD means treat non-directory part of FILE as
emacs regexp (_not_ a shell wildcard). If you enter regexps remember
to double each $ sign.
Optional fourth arg FULL-DIRECTORY-P means file is a directory and
switches do not contain `d'.
SWITCHES default to dired-listing-switches."
(or switches (setq switches dired-listing-switches))
(or (consp switches) ; convert to list of chars
(setq switches (mapcar 'identity switches)))
(if wildcard
(setq wildcard (file-name-nondirectory file) ; actually emacs regexp
;; perhaps convert it from shell to emacs syntax?
file (file-name-directory file)))
(if (or wildcard
full-directory-p)
(let* ((dir (file-name-as-directory file))
(default-directory dir);; so that file-attributes works
(sum 0)
elt
(file-list (directory-files dir nil wildcard))
file-alist
;; do all bindings here for speed
fil attr)
(cond ((memq ?A switches)
(setq file-list
(dired-lisp-delete-matching "^\\.\\.?$" file-list)))
((not (memq ?a switches))
;; if neither -A nor -a, flush . files
(setq file-list
(dired-lisp-delete-matching "^\\." file-list))))
(setq file-alist
(mapcar
(function
(lambda (x)
;; file-attributes("~bogus") bombs
(cons x (file-attributes (expand-file-name x)))))
;; inserting the call to directory-files right here
;; seems to stimulate an Emacs bug
;; ILLEGAL DATATYPE (#o37777777727) or #o67
file-list))
(insert "total \007\n") ; filled in afterwards
(setq file-alist
(dired-lisp-handle-switches file-alist switches))
(while file-alist
(setq elt (car file-alist)
short (car elt)
attr (cdr elt)
file-alist (cdr file-alist)
fil (concat dir short)
sum (+ sum (nth 7 attr)))
(insert (dired-lisp-format short attr switches)))
;; Fill in total size of all files:
(save-excursion
(search-backward "total \007")
(goto-char (match-end 0))
(delete-char -1)
(insert (format "%d" (1+ (/ sum 1024))))))
;; if not full-directory-p, FILE *must not* end in /, as
;; file-attributes will not recognize a symlink to a directory
;; must make it a relative filename as ls does:
(setq file (file-name-nondirectory file))
(insert (dired-lisp-format file (file-attributes file) switches))))
(defun dired-lisp-delete-matching (regexp list)
;; Delete all elements matching REGEXP from LIST, return new list.
;; Should perhaps use setcdr for efficiency.
(let (result)
(while list
(or (string-match regexp (car list))
(setq result (cons (car list) result)))
(setq list (cdr list)))
result))
(defun dired-lisp-handle-switches (file-alist switches)
;; FILE-ALIST's elements are (FILE . FILE-ATTRIBUTES).
;; Return new alist sorted according to SWITCHES which is a list of
;; characters. Default sorting is alphabetically.
(let (index)
(setq file-alist
(sort file-alist
(cond ((memq ?S switches) ; sorted on size
(function
(lambda (x y)
;; 7th file attribute is file size
;; Make largest file come first
(< (nth 7 (cdr y))
(nth 7 (cdr x))))))
((memq ?t switches) ; sorted on time
(setq index (dired-lisp-time-index switches))
(function
(lambda (x y)
(time-lessp (nth index (cdr y))
(nth index (cdr x))))))
(t ; sorted alphabetically
(function
(lambda (x y)
(string-lessp (car x)
(car y)))))))))
(if (memq ?r switches) ; reverse sort order
(setq file-alist (nreverse file-alist)))
file-alist)
;; From Roland McGrath. Can use this to sort on time.
(defun time-lessp (time0 time1)
(let ((hi0 (car time0))
(hi1 (car time1))
(lo0 (car (cdr time0)))
(lo1 (car (cdr time1))))
(or (< hi0 hi1)
(and (= hi0 hi1)
(< lo0 lo1)))))
(defun dired-lisp-format (file-name file-attr &optional switches)
(let ((file-type (nth 0 file-attr)))
(concat (if (memq ?i switches) ; inode number
(format "%6d " (nth 10 file-attr)))
;; nil is treated like "" in concat
(if (memq ?s switches) ; size in K
(format "%4d " (1+ (/ (nth 7 file-attr) 1024))))
(nth 8 file-attr) ; permission bits
;; numeric uid/gid are more confusing than helpful
;; Emacs should be able to make strings of them.
;; user-login-name and user-full-name could take an
;; optional arg.
(format " %3d %-8d %-8d %8d "
(nth 1 file-attr) ; no. of links
(nth 2 file-attr) ; uid
(nth 3 file-attr) ; gid
(nth 7 file-attr) ; size in bytes
)
(dired-lisp-format-time file-attr switches)
" "
file-name
(if (stringp file-type) ; is a symbolic link
(concat " -> " file-type)
"")
"\n"
)))
(defun dired-lisp-time-index (switches)
;; Return index into file-attributes according to ls SWITCHES.
(cond
((memq ?c switches) 6) ; last mode change
((memq ?u switches) 4) ; last access
;; default is last modtime
(t 5)))
(defun dired-lisp-format-time (file-attr switches)
;; Format time string for file with attributes FILE-ATTR according
;; to SWITCHES (a list of ls option letters of which c and u are recognized).
;; file-attributes's time is in a braindead format
;; Emacs 19 can format it using a new optional argument to
;; current-time-string, for Emacs 18 we just return the faked fixed
;; date "Jan 00 00:00 ".
(condition-case error-data
(let* ((time (current-time-string
(nth (dired-lisp-time-index switches) file-attr)))
(date (substring time 4 11)) ; "Apr 30 "
(clock (substring time 11 16)) ; "11:27"
(year (substring time 19 24)) ; " 1992"
(same-year (equal year (substring (current-time-string) 19 24))))
(concat date ; has trailing SPC
(if same-year
;; this is not exactly the same test used by ls
;; ls tests if the file is older than 6 months
;; but we can't do time differences easily
clock
year)))
(error
"Jan 00 00:00")))
(provide 'dired-lisp)
; eof
|
