-;;;; dired-lisp.el - emulate ls completely in Emacs Lisp
-;;;; Copyright (C) 1990 Sebastian Kremer
-
-;;;; Useful if you cannot afford to fork Emacs on a real memory UNIX,
-;;;; under VMS, or if you don't have the ls program.
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs 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.
-
-;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-;;;; WARNING:
-
-;;;; I initially used file-name-all-completions instead of
-;;;; directory-files and got an internal Emacs error:
-
-;;;; Signalling: (wrong-type-argument natnump #<EMACS BUG: ILLEGAL
-;;;; DATATYPE (#o37777777727) Save your buffers immediately and please
-;;;; report this bug>)
-
-;;;; It has never happened again and had no bad aftereffects, but do be
-;;;; careful!
-
-;;; RESTRICTIONS:
-;;;; Always sorts by name (ls switches are completely ignored for now)
-;;;; Cannot display date of file, displays a fake date "Jan 00 00:00" instead
-;;;; Only numeric uid/gid
-
-;;;; It is surprisingly fast, though!
-
-;;;; TODO:
-;;;; Recognize at least some ls switches: l R g F i
-
-(require 'dired)
-
-(or (fboundp 'tree-dired-ls) ; save original function definition
- (fset 'tree-dired-ls (symbol-function 'dired-ls)))
-
-;; perhaps buffer-local (he he)
-(defvar dired-ls-function 'dired-lisp-ls
- "*Function dired uses to obtain ls output.
-Possible values 'tree-dired-ls and 'dired-lisp-ls.
-Arglist is (FILE &optional SWITCHES WILDCARD FULL-DIRECTORY-P).")
-
-(defun dired-ls (file &optional switches wildcard full-directory-p)
- (funcall dired-ls-function file switches wildcard full-directory-p))
-
-(defun dired-lisp-ls (file &optional switches wildcard full-directory-p)
-; "Insert ls output of FILE, optionally formatted with SWITCHES.
-;Optional third arg WILDCARD means treat FILE as shell wildcard.
-;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))
- (if wildcard
- (error "Cannot handle wildcards in lisp emulation of `ls'."))
- (if full-directory-p
- (let* ((dir (file-name-as-directory file))
- (start (length dir))
- (sum 0))
- (insert "total \007\n") ; fill in afterwards
- (insert
- (mapconcat
- (function (lambda (short)
- (let* ((fil (concat dir short))
- (attr (file-attributes fil))
- (size (nth 7 attr)))
- ;;(debug)
- (setq sum (+ sum size))
- (dired-lisp-format
- ;;(file-name-nondirectory fil)
- ;;(dired-make-relative fil dir)
- ;;(substring fil start)
- short
- attr
- switches))))
- (directory-files dir)
- ""))
- (save-excursion
- (search-backward "total \007")
- (goto-char (match-end 0))
- (delete-char -1)
- (insert (format "%d" sum)))
- )
- ;; 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-format (file-name file-attr &optional switches)
- (let ((file-type (nth 0 file-attr)))
- (concat (nth 8 file-attr) ; permission bits
- " "
- (dired-lisp-pad (nth 1 file-attr) -3) ; no. of links
- ;; numeric uid/gid are more confusing than helpful
- ;; Emacs should be able to make strings of them
- " " (dired-lisp-pad (nth 2 file-attr) -6) ; uid
- " " (dired-lisp-pad (nth 3 file-attr) -6) ; gid
- " "
- (dired-lisp-pad (nth 7 file-attr) -8) ; size in bytes
- ;; file-attributes's time is in a braindead format
- ;; Emacs should have a ctime function
- " " "Jan 00 00:00 " ; fake time
- file-name
- (if (stringp file-type) ; is a symbolic link
- (concat " -> " file-type)
- "")
- "\n"
- )))
-
-;; format should really do anything printf can!!
-(defun dired-lisp-pad (arg width &optional pad-char)
- "Pad ARG to WIDTH, from left if WIDTH < 0.
-Non-nil third arg optional PAD-CHAR defaults to a space."
- (or pad-char (setq pad-char ?\040))
- (if (integerp arg)
- (setq arg (int-to-string arg)))
- (let (l pad reverse)
- (if (< width 0)
- (setq reverse t
- width (- width)))
- (setq l (length arg)
- pad (- width l))
- (if (> pad 0)
- (if reverse
- (concat (make-string pad pad-char) arg)
- (concat arg (make-string pad pad-char)))
- arg)))
+;;; ls-lisp.el --- emulate insert-directory completely in Emacs Lisp
+
+;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
+;; Keywords: unix
+
+;; Copyright (C) 1992, 1994 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 2, 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.
+
+;; INSTALLATION =======================================================
+;;
+;; Put this file into your load-path. To use it, load it
+;; with (load "ls-lisp").
+
+;; OVERVIEW ===========================================================
+
+;; This file overloads the function insert-directory to implement it
+;; directly from Emacs lisp, without running `ls' in a subprocess.
+
+;; It is 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.
+
+;; This function uses regexps instead of shell
+;; wildcards. If you enter regexps remember to double each $ sign.
+;; For example, to include files *.el, enter `.*\.el$$',
+;; resulting in the regexp `.*\.el$'.
+
+;; RESTRICTIONS =====================================================
+
+;; * many ls switches are ignored, see docstring of `insert-directory'.
+
+;; * Only numeric uid/gid
+
+;; TODO ==============================================================
+
+;; Recognize some more ls switches: R F
+\f
+;;; Code:
+
+(defun insert-directory (file &optional switches wildcard full-directory-p)
+ "Insert directory listing for of FILE, formatted according to SWITCHES.
+Leaves point after the inserted text.
+Optional third arg WILDCARD means treat FILE as shell wildcard.
+Optional fourth arg FULL-DIRECTORY-P means file is a directory and
+switches do not contain `d', so that a full listing is expected.
+
+This version of the function comes from `ls-lisp.el'.
+It does not support ordinary shell wildcards; instead, it allows
+regular expressions to match file names.
+
+The switches that work are: A a c i r S s t u"
+ (let ((handler (find-file-name-handler file 'insert-directory)))
+ (if handler
+ (funcall handler 'insert-directory file switches
+ wildcard full-directory-p)
+ ;; Convert SWITCHES to a list of characters.
+ (setq switches (append switches nil))
+ (if wildcard
+ (setq wildcard (file-name-nondirectory file) ; actually emacs regexp
+ ;; perhaps convert it from shell to emacs syntax?
+ file (file-name-directory file)))
+ (if (or wildcard
+ full-directory-p)
+ (let* ((dir (file-name-as-directory file))
+ (default-directory dir);; so that file-attributes works
+ (sum 0)
+ elt
+ short
+ (file-list (directory-files dir nil wildcard))
+ file-alist
+ ;; do all bindings here for speed
+ fil attr)
+ (cond ((memq ?A switches)
+ (setq file-list
+ (ls-lisp-delete-matching "^\\.\\.?$" file-list)))
+ ((not (memq ?a switches))
+ ;; if neither -A nor -a, flush . files
+ (setq file-list
+ (ls-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
+ (ls-lisp-handle-switches file-alist switches))
+ (while file-alist
+ (setq elt (car file-alist)
+ file-alist (cdr file-alist)
+ short (car elt)
+ attr (cdr elt))
+ (and attr
+ (setq sum (+ sum (nth 7 attr)))
+ (insert (ls-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 (ls-lisp-format file (file-attributes file) switches))))))
+
+(defun ls-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 ls-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 (ls-lisp-time-index switches))
+ (function
+ (lambda (x y)
+ (ls-lisp-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 ls-lisp-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 ls-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 %8s %8s %8d "
+ (nth 1 file-attr) ; no. of links
+ (if (= (user-uid) (nth 2 file-attr))
+ (user-login-name)
+ (int-to-string (nth 2 file-attr))) ; uid
+ (if (eq system-type 'ms-dos)
+ "root" ; everything is root on MSDOS.
+ (int-to-string (nth 3 file-attr))) ; gid
+ (nth 7 file-attr) ; size in bytes
+ )
+ (ls-lisp-format-time file-attr switches)
+ " "
+ file-name
+ (if (stringp file-type) ; is a symbolic link
+ (concat " -> " file-type)
+ "")
+ "\n"
+ )))
+
+(defun ls-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 ls-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 (ls-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 'ls-lisp)
+
+;;; ls-lisp.el ends here
HCoop / bpt / emacs.git / blobdiff