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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: 1.8 !" 11 -2)
- "!Id: dired-lisp.el,v 1.8 1992/05/01 17:50:56 sk Exp !")
-
- ;; 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: 1992/05/01 17:50:56 |Revision: 1.8 |
-
- ;; 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)
-