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- ;;; ls-lisp.el --- emulate insert-directory completely in Emacs Lisp
-
- ;; Copyright (C) 1992, 1994 by Sebastian Kremer <sk@thp.uni-koeln.de>
-
- ;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
- ;; Keywords: unix
-
- ;; 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 2, 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, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; 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
-
- ;;; Code:
-
- ;;;###autoload
- (defvar ls-lisp-support-shell-wildcards t
- "*Non-nil means file patterns are treated as shell wildcards.
- nil means they are treated as Emacs regexps (for backward compatibility).
- This variable is checked by \\[insert-directory] only when `ls-lisp.el'
- package is used.")
-
- (defun insert-directory (file &optional switches wildcard full-directory-p)
- "Insert directory listing for 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 doesn not
- run any external programs or shells. It supports ordinary shell
- wildcards if `ls-lisp-support-shell-wildcards' variable is non-nil;
- otherwise, it interprets wildcards as regular expressions to match
- file names.
-
- Not all `ls' switches are supported. 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)
- ;; Sometimes we get ".../foo*/" as FILE. While the shell and
- ;; `ls' don't mind, we certainly do, because it makes us think
- ;; there is no wildcard, only a directory name.
- (if (and ls-lisp-support-shell-wildcards
- (string-match "[[?*]" file))
- (progn
- (or (not (eq (aref file (1- (length file))) ?/))
- (setq file (substring file 0 (1- (length file)))))
- (setq wildcard t)))
- ;; Convert SWITCHES to a list of characters.
- (setq switches (append switches nil))
- (if wildcard
- (setq wildcard
- (if ls-lisp-support-shell-wildcards
- (wildcard-to-regexp (file-name-nondirectory file))
- (file-name-nondirectory file))
- 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))
- ;; ``Total'' line (filled in afterwards).
- (insert (if (car-safe file-alist)
- "total \007\n"
- ;; Shell says ``No match'' if no files match
- ;; the wildcard; let's say something similar.
- "(No match)\ntotal \007\n"))
- (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" (if (zerop sum) 0 (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
-