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;;; dired.el --- directory-browsing commands
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;; Copyright (C) 1985, 86, 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
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;; Author: Sebastian Kremer <sk@thp.uni-koeln.de>
;; Maintainer: FSF
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;; 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
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;; the Free Software Foundation; either version 2, or (at your option)
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;; 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
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;; 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.
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;;; Commentary:

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;; This is a major mode for directory browsing and editing.  It is
;; documented in the Emacs manual.

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;; Rewritten in 1990/1991 to add tree features, file marking and
;; sorting by Sebastian Kremer <sk@thp.uni-koeln.de>.
;; Finished up by rms in 1992.

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;;; Code:
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;;; Customizable variables

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(defgroup dired nil
  "Directory editing."
  :group 'environment)

(defgroup dired-mark nil
  "Handling marks in dired."
  :prefix "dired-"
  :group 'dired)


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;;;###autoload
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(defcustom dired-listing-switches "-al"
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  "*Switches passed to `ls' for dired.  MUST contain the `l' option.
May contain all other options that don't contradict `-l';
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may contain even `F', `b', `i' and `s'.  See also the variable
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`dired-ls-F-marks-symlinks' concerning the `F' switch."
  :type 'string
  :group 'dired)
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; Don't use absolute paths as /bin should be in any PATH and people
; may prefer /usr/local/gnu/bin or whatever.  However, chown is
; usually not in PATH.

;;;###autoload
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(defvar dired-chown-program
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  (if (memq system-type '(hpux dgux usg-unix-v irix linux gnu/linux))
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      "chown"
    (if (file-exists-p "/usr/sbin/chown")
	"/usr/sbin/chown"
      "/etc/chown"))
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  "Name of chown command (usually `chown' or `/etc/chown').")
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(defvar dired-chmod-program
  (if (eq system-type 'windows-nt)
      "chmode" "chmod")
  "Name of chmod command (usually `chmod' or `chmode').")

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;;;###autoload
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(defcustom dired-ls-F-marks-symlinks nil
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  "*Informs dired about how `ls -lF' marks symbolic links.
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Set this to t if `ls' (or whatever program is specified by
`insert-directory-program') with `-lF' marks the symbolic link
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itself with a trailing @ (usually the case under Ultrix).
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Example: if `ln -s foo bar; ls -F bar' gives `bar -> foo', set it to
nil (the default), if it gives `bar@ -> foo', set it to t.

Dired checks if there is really a @ appended.  Thus, if you have a
marking `ls' program on one host and a non-marking on another host, and
don't care about symbolic links which really end in a @, you can
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always set this variable to t."
  :type 'boolean
  :group 'dired-mark)
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;;;###autoload
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(defcustom dired-trivial-filenames "^\\.\\.?$\\|^#"
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  "*Regexp of files to skip when finding first file of a directory.
A value of nil means move to the subdir line.
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A value of t means move to first file."
  :type '(choice (const :tag "Move to subdir" nil)
		 (const :tag "Move to first" t)
		 regexp)
  :group 'dired)
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;;;###autoload
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(defcustom dired-keep-marker-rename t
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  ;; Use t as default so that moved files "take their markers with them".
  "*Controls marking of renamed files.
If t, files keep their previous marks when they are renamed.
If a character, renamed files (whether previously marked or not)
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are afterward marked with that character."
  :type '(choice (const :tag "Keep" t)
		 (character :tag "Mark"))
  :group 'dired-mark)
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;;;###autoload
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(defcustom dired-keep-marker-copy ?C
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  "*Controls marking of copied files.
If t, copied files are marked if and as the corresponding original files were.
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If a character, copied files are unconditionally marked with that character."
  :type '(choice (const :tag "Keep" t)
		 (character :tag "Mark"))
  :group 'dired-mark)
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;;;###autoload
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(defcustom dired-keep-marker-hardlink ?H
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  "*Controls marking of newly made hard links.
If t, they are marked if and as the files linked to were marked.
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If a character, new links are unconditionally marked with that character."
  :type '(choice (const :tag "Keep" t)
		 (character :tag "Mark"))
  :group 'dired-mark)
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;;;###autoload
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(defcustom dired-keep-marker-symlink ?Y
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  "*Controls marking of newly made symbolic links.
If t, they are marked if and as the files linked to were marked.
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If a character, new links are unconditionally marked with that character."
  :type '(choice (const :tag "Keep" t)
		 (character :tag "Mark"))
  :group 'dired-mark)
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;;;###autoload
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(defcustom dired-dwim-target nil
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  "*If non-nil, dired tries to guess a default target directory.
This means: if there is a dired buffer displayed in the next window,
use its current subdir, instead of the current subdir of this dired buffer.

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The target is used in the prompt for file copy, rename etc."
  :type 'boolean
  :group 'dired)
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;;;###autoload
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(defcustom dired-copy-preserve-time t
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  "*If non-nil, Dired preserves the last-modified time in a file copy.
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\(This works on only some systems.)"
  :type 'boolean
  :group 'dired)
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;;; Hook variables

(defvar dired-load-hook nil
  "Run after loading dired.
You can customize key bindings or load extensions with this.")

(defvar dired-mode-hook nil
  "Run at the very end of dired-mode.")

(defvar dired-before-readin-hook nil
  "This hook is run before a dired buffer is read in (created or reverted).")

(defvar dired-after-readin-hook nil
  "Hook run after each time a file or directory is read by Dired.
After each listing of a file or directory, this hook is run
with the buffer narrowed to the listing.")
;; Note this can't simply be run inside function `dired-ls' as the hook
;; functions probably depend on the dired-subdir-alist to be OK.

;;; Internal variables

(defvar dired-marker-char ?*		; the answer is 42
  ;; so that you can write things like
  ;; (let ((dired-marker-char ?X))
  ;;    ;; great code using X markers ...
  ;;    )
  ;; For example, commands operating on two sets of files, A and B.
  ;; Or marking files with digits 0-9.  This could implicate
  ;; concentric sets or an order for the marked files.
  ;; The code depends on dynamic scoping on the marker char.
  "In Dired, the current mark character.
This is what the `do' commands look for and what the `mark' commands store.")

(defvar dired-del-marker ?D
  "Character used to flag files for deletion.")

(defvar dired-shrink-to-fit
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  t
;; I see no reason ever to make this nil -- rms.
;;  (> baud-rate search-slow-speed)
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  "Non-nil means Dired shrinks the display buffer to fit the marked files.")

(defvar dired-flagging-regexp nil);; Last regexp used to flag files.

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(defvar dired-file-version-alist)

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(defvar dired-directory nil
  "The directory name or shell wildcard that was used as argument to `ls'.
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Local to each dired buffer.  May be a list, in which case the car is the
directory name and the cdr is the actual files to list.")
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(defvar dired-actual-switches nil
  "The value of `dired-listing-switches' used to make this buffer's text.")

(defvar dired-re-inode-size "[0-9 \t]*"
  "Regexp for optional initial inode and file size as made by `ls -i -s'.")

;; These regexps must be tested at beginning-of-line, but are also
;; used to search for next matches, so neither omitting "^" nor
;; replacing "^" by "\n" (to make it slightly faster) will work.

(defvar dired-re-mark "^[^ \n]")
;; "Regexp matching a marked line.
;; Important: the match ends just after the marker."
(defvar dired-re-maybe-mark "^. ")
(defvar dired-re-dir (concat dired-re-maybe-mark dired-re-inode-size "d"))
(defvar dired-re-sym (concat dired-re-maybe-mark dired-re-inode-size "l"))
(defvar dired-re-exe;; match ls permission string of an executable file
  (mapconcat (function
	      (lambda (x)
		(concat dired-re-maybe-mark dired-re-inode-size x)))
	     '("-[-r][-w][xs][-r][-w].[-r][-w]."
	       "-[-r][-w].[-r][-w][xs][-r][-w]."
	       "-[-r][-w].[-r][-w].[-r][-w][xst]")
	     "\\|"))
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(defvar dired-re-perms "[-bcdlps][-r][-w].[-r][-w].[-r][-w].")
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(defvar dired-re-dot "^.* \\.\\.?$")

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;; The subdirectory names in this list are expanded.
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(defvar dired-subdir-alist nil
  "Association list of subdirectories and their buffer positions.
Each subdirectory has an element: (DIRNAME . STARTMARKER).
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The order of elements is the reverse of the order in the buffer.
In simple cases, this list contains one element.")
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(defvar dired-subdir-regexp "^. \\([^\n\r]+\\)\\(:\\)[\n\r]"
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  "Regexp matching a maybe hidden subdirectory line in `ls -lR' output.
Subexpression 1 is the subdirectory proper, no trailing colon.
The match starts at the beginning of the line and ends after the end
of the line (\\n or \\r).
Subexpression 2 must end right before the \\n or \\r.")

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(defvar dired-font-lock-keywords
  (list
   ;;
   ;; Directory headers.
   (list dired-subdir-regexp '(1 font-lock-type-face))
   ;;
   ;; We make heavy use of MATCH-ANCHORED, since the regexps don't identify the
   ;; file name itself.  We search for Dired defined regexps, and then use the
   ;; Dired defined function `dired-move-to-filename' before searching for the
   ;; simple regexp ".+".  It is that regexp which matches the file name.
   ;;
   ;; Dired marks.
   (list dired-re-mark
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	 '(0 font-lock-constant-face)
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	 '(".+" (dired-move-to-filename) nil (0 font-lock-warning-face)))
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   ;; People who are paranoid about security would consider this more
   ;; important than other things such as whether it is a directory.
   ;; But we don't want to encourage paranoia, so our default
   ;; should be what's most useful for non-paranoids. -- rms.
;;;   ;;
;;;   ;; Files that are group or world writable.
;;;   (list (concat dired-re-maybe-mark dired-re-inode-size
;;;		 "\\([-d]\\(....w....\\|.......w.\\)\\)")
;;;	 '(1 font-lock-comment-face)
;;;	 '(".+" (dired-move-to-filename) nil (0 font-lock-comment-face)))
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   ;;
   ;; Subdirectories.
   (list dired-re-dir
	 '(".+" (dired-move-to-filename) nil (0 font-lock-function-name-face)))
   ;;
   ;; Symbolic links.
   (list dired-re-sym 
	 '(".+" (dired-move-to-filename) nil (0 font-lock-keyword-face)))
   ;;
   ;; Files suffixed with `completion-ignored-extensions'.
   '(eval .
     (let ((extensions (mapcar 'regexp-quote completion-ignored-extensions)))
       ;; It is quicker to first find just an extension, then go back to the
       ;; start of that file name.  So we do this complex MATCH-ANCHORED form.
       (list (concat "\\(" (mapconcat 'identity extensions "\\|") "\\|#\\)$")
	     '(".+" (dired-move-to-filename) nil (0 font-lock-string-face))))))
  "Additional expressions to highlight in Dired mode.")
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;;; Macros must be defined before they are used, for the byte compiler.

;; Mark all files for which CONDITION evals to non-nil.
;; CONDITION is evaluated on each line, with point at beginning of line.
;; MSG is a noun phrase for the type of files being marked.
;; It should end with a noun that can be pluralized by adding `s'.
;; Return value is the number of files marked, or nil if none were marked.
(defmacro dired-mark-if (predicate msg)
  (` (let (buffer-read-only count)
       (save-excursion
	 (setq count 0)
	 (if (, msg) (message "Marking %ss..." (, msg)))
	 (goto-char (point-min))
	 (while (not (eobp))
	   (if (, predicate)
	       (progn
		 (delete-char 1)
		 (insert dired-marker-char)
		 (setq count (1+ count))))
	   (forward-line 1))
	 (if (, msg) (message "%s %s%s %s%s."
			  count
			  (, msg)
			  (dired-plural-s count)
			  (if (eq dired-marker-char ?\040) "un" "")
			  (if (eq dired-marker-char dired-del-marker)
			      "flagged" "marked"))))
       (and (> count 0) count))))

(defmacro dired-map-over-marks (body arg &optional show-progress)
;;  "Macro: Perform BODY with point somewhere on each marked line
;;and return a list of BODY's results.
;;If no marked file could be found, execute BODY on the current line.
;;  If ARG is an integer, use the next ARG (or previous -ARG, if ARG<0)
;;  files instead of the marked files.
;;  In that case point is dragged along.  This is so that commands on
;;  the next ARG (instead of the marked) files can be chained easily.
;;  If ARG is otherwise non-nil, use current file instead.
;;If optional third arg SHOW-PROGRESS evaluates to non-nil,
;;   redisplay the dired buffer after each file is processed.
;;No guarantee is made about the position on the marked line.
;;  BODY must ensure this itself if it depends on this.
;;Search starts at the beginning of the buffer, thus the car of the list
;;  corresponds to the line nearest to the buffer's bottom.  This
;;  is also true for (positive and negative) integer values of ARG.
;;BODY should not be too long as it is expanded four times."
;;
;;Warning: BODY must not add new lines before point - this may cause an
;;endless loop.
;;This warning should not apply any longer, sk  2-Sep-1991 14:10.
  (` (prog1
	 (let (buffer-read-only case-fold-search found results)
	   (if (, arg)
	       (if (integerp (, arg))
		   (progn;; no save-excursion, want to move point.
		     (dired-repeat-over-lines
		      (, arg)
		      (function (lambda ()
				  (if (, show-progress) (sit-for 0))
				  (setq results (cons (, body) results)))))
		     (if (< (, arg) 0)
			 (nreverse results)
		       results))
		 ;; non-nil, non-integer ARG means use current file:
		 (list (, body)))
	     (let ((regexp (dired-marker-regexp)) next-position)
	       (save-excursion
		 (goto-char (point-min))
		 ;; remember position of next marked file before BODY
		 ;; can insert lines before the just found file,
		 ;; confusing us by finding the same marked file again
		 ;; and again and...
		 (setq next-position (and (re-search-forward regexp nil t)
					  (point-marker))
		       found (not (null next-position)))
		 (while next-position
		   (goto-char next-position)
		   (if (, show-progress) (sit-for 0))
		   (setq results (cons (, body) results))
		   ;; move after last match
		   (goto-char next-position)
		   (forward-line 1)
		   (set-marker next-position nil)
		   (setq next-position (and (re-search-forward regexp nil t)
					    (point-marker)))))
	       (if found
		   results
		 (list (, body))))))
       ;; save-excursion loses, again
       (dired-move-to-filename))))

(defun dired-get-marked-files (&optional localp arg)
  "Return the marked files' names as list of strings.
The list is in the same order as the buffer, that is, the car is the
  first marked file.
Values returned are normally absolute pathnames.
Optional arg LOCALP as in `dired-get-filename'.
Optional second argument ARG forces to use other files.  If ARG is an
  integer, use the next ARG files.  If ARG is otherwise non-nil, use
  current file.  Usually ARG comes from the current prefix arg."
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  (save-excursion
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    (nreverse (dired-map-over-marks (dired-get-filename localp) arg))))
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;; Function dired-ls is redefinable for VMS, ange-ftp, Prospero or
;; other special applications.

;; The dired command

(defun dired-read-dir-and-switches (str)
  ;; For use in interactive.
  (reverse (list
	    (if current-prefix-arg
		(read-string "Dired listing switches: "
			     dired-listing-switches))
	    (read-file-name (format "Dired %s(directory): " str)
			    nil default-directory nil))))
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;;;###autoload (define-key ctl-x-map "d" 'dired)
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;;;###autoload
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(defun dired (dirname &optional switches)
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  "\"Edit\" directory DIRNAME--delete, rename, print, etc. some files in it.
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Optional second argument SWITCHES specifies the `ls' options used.
\(Interactively, use a prefix argument to be able to specify SWITCHES.)
Dired displays a list of files in DIRNAME (which may also have
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shell wildcards appended to select certain files).  If DIRNAME is a cons,
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its first element is taken as the directory name and the rest as an explicit
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list of files to make directory entries for.
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\\<dired-mode-map>\
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You can move around in it with the usual commands.
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You can flag files for deletion with \\[dired-flag-file-deletion] and then
delete them by typing \\[dired-do-flagged-delete].
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Type \\[describe-mode] after entering dired for more info.
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If DIRNAME is already in a dired buffer, that buffer is used without refresh."
  ;; Cannot use (interactive "D") because of wildcards.
  (interactive (dired-read-dir-and-switches ""))
  (switch-to-buffer (dired-noselect dirname switches)))

;;;###autoload (define-key ctl-x-4-map "d" 'dired-other-window)
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;;;###autoload
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(defun dired-other-window (dirname &optional switches)
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  "\"Edit\" directory DIRNAME.  Like `dired' but selects in another window."
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  (interactive (dired-read-dir-and-switches "in other window "))
  (switch-to-buffer-other-window (dired-noselect dirname switches)))
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;;;###autoload (define-key ctl-x-5-map "d" 'dired-other-frame)
;;;###autoload
(defun dired-other-frame (dirname &optional switches)
  "\"Edit\" directory DIRNAME.  Like `dired' but makes a new frame."
  (interactive (dired-read-dir-and-switches "in other frame "))
  (switch-to-buffer-other-frame (dired-noselect dirname switches)))

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;;;###autoload
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(defun dired-noselect (dir-or-list &optional switches)
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  "Like `dired' but returns the dired buffer as value, does not select it."
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  (or dir-or-list (setq dir-or-list default-directory))
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  ;; This loses the distinction between "/foo/*/" and "/foo/*" that
  ;; some shells make:
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  (let (dirname initially-was-dirname)
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    (if (consp dir-or-list)
	(setq dirname (car dir-or-list))
      (setq dirname dir-or-list))
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    (setq initially-was-dirname
	  (string= (file-name-as-directory dirname) dirname))
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    (setq dirname (abbreviate-file-name
		   (expand-file-name (directory-file-name dirname))))
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    (if find-file-visit-truename
	(setq dirname (file-truename dirname)))
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    ;; If the argument was syntactically  a directory name not a file name,
    ;; or if it happens to name a file that is a directory,
    ;; convert it syntactically to a directory name.
    ;; The reason for checking initially-was-dirname
    ;; and not just file-directory-p
    ;; is that file-directory-p is slow over ftp.
    (if (or initially-was-dirname (file-directory-p dirname))
	(setq dirname  (file-name-as-directory dirname)))
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    (if (consp dir-or-list)
	(setq dir-or-list (cons dirname (cdr dir-or-list)))
      (setq dir-or-list dirname))
    (dired-internal-noselect dir-or-list switches)))
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;; Separate function from dired-noselect for the sake of dired-vms.el.
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(defun dired-internal-noselect (dir-or-list &optional switches mode)
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  ;; If there is an existing dired buffer for DIRNAME, just leave
  ;; buffer as it is (don't even call dired-revert).
  ;; This saves time especially for deep trees or with ange-ftp.
  ;; The user can type `g'easily, and it is more consistent with find-file.
  ;; But if SWITCHES are given they are probably different from the
  ;; buffer's old value, so call dired-sort-other, which does
  ;; revert the buffer.
  ;; A pity we can't possibly do "Directory has changed - refresh? "
  ;; like find-file does.
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  ;; Optional argument MODE is passed to dired-find-buffer-nocreate,
  ;; see there.
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  (let* ((dirname (if (consp dir-or-list) (car dir-or-list) dir-or-list))
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	 ;; The following line used to use dir-or-list.
	 ;; That never found an existing buffer, in the case
	 ;; where it is a list.
	 (buffer (dired-find-buffer-nocreate dirname mode))
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	 ;; note that buffer already is in dired-mode, if found
	 (new-buffer-p (not buffer))
	 (old-buf (current-buffer)))
    (or buffer
	(let ((default-major-mode 'fundamental-mode))
	  ;; We don't want default-major-mode to run hooks and set auto-fill
	  ;; or whatever, now that dired-mode does not
	  ;; kill-all-local-variables any longer.
	  (setq buffer (create-file-buffer (directory-file-name dirname)))))
    (set-buffer buffer)
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    (if (not new-buffer-p)     ; existing buffer ...
	(cond (switches        ; ... but new switches     
	       ;; file list may have changed
	       (if (consp dir-or-list) 
		   (setq dired-directory dir-or-list))
	       ;; this calls dired-revert
	       (dired-sort-other switches))  
	      ;; If directory has changed on disk, offer to revert.
	      ((if (let ((attributes (file-attributes dirname))
			 (modtime (visited-file-modtime)))
		     (or (eq modtime 0)
			 (not (eq (car attributes) t))
			 (and (= (car (nth 5 attributes)) (car modtime))
			      (= (nth 1 (nth 5 attributes)) (cdr modtime)))))
		   nil
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		 (message "%s"
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			  (substitute-command-keys
			   "Directory has changed on disk; type \\[revert-buffer] to update Dired")))))
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      ;; Else a new buffer
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      (setq default-directory
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	    ;; We can do this unconditionally
	    ;; because dired-noselect ensures that the name
	    ;; is passed in directory name syntax
	    ;; if it was the name of a directory at all.
	    (file-name-directory dirname))
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      (or switches (setq switches dired-listing-switches))
      (dired-mode dirname switches)
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      (if mode (funcall mode))
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      ;; default-directory and dired-actual-switches are set now
      ;; (buffer-local), so we can call dired-readin:
      (let ((failed t))
	(unwind-protect
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	    (progn (dired-readin dir-or-list buffer)
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		   (setq failed nil))
	  ;; dired-readin can fail if parent directories are inaccessible.
	  ;; Don't leave an empty buffer around in that case.
	  (if failed (kill-buffer buffer))))
      ;; No need to narrow since the whole buffer contains just
      ;; dired-readin's output, nothing else.  The hook can
      ;; successfully use dired functions (e.g. dired-get-filename)
      ;; as the subdir-alist has been built in dired-readin.
      (run-hooks 'dired-after-readin-hook)
      (goto-char (point-min))
      (dired-initial-position dirname))
    (set-buffer old-buf)
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    buffer))

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(defun dired-find-buffer-nocreate (dirname &optional mode)
  ;; This differs from dired-buffers-for-dir in that it does not consider
  ;; subdirs of default-directory and searches for the first match only.
  ;; Also, the major mode must be MODE.
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  (let (found (blist dired-buffers))    ; was (buffer-list)
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    (or mode (setq mode 'dired-mode))
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    (while blist
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      (if (null (buffer-name (cdr (car blist))))
	  (setq blist (cdr blist))
	(save-excursion
	  (set-buffer (cdr (car blist)))
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	  (if (and (eq major-mode mode)
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		   (if (consp dired-directory)
		       (equal (car dired-directory) dirname)
		     (equal dired-directory dirname)))
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	      (setq found (cdr (car blist))
		    blist nil)
	    (setq blist (cdr blist))))))
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    found))


;; Read in a new dired buffer

;; dired-readin differs from dired-insert-subdir in that it accepts
;; wildcards, erases the buffer, and builds the subdir-alist anew
;; (including making it buffer-local and clearing it first).
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(defun dired-readin (dir-or-list buffer)
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  ;; default-directory and dired-actual-switches must be buffer-local
  ;; and initialized by now.
  ;; Thus we can test (equal default-directory dirname) instead of
  ;; (file-directory-p dirname) and save a filesystem transaction.
  ;; Also, we can run this hook which may want to modify the switches
  ;; based on default-directory, e.g. with ange-ftp to a SysV host
  ;; where ls won't understand -Al switches.
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  (let (dirname)
    (if (consp dir-or-list)
	(setq dirname (car dir-or-list))
      (setq dirname dir-or-list))
    (setq dirname (expand-file-name dirname))
    (if (consp dir-or-list)
	(setq dir-or-list (cons dirname (cdr dir-or-list))))
    (run-hooks 'dired-before-readin-hook)
    (save-excursion
      (message "Reading directory %s..." dirname)
      (set-buffer buffer)
      (let (buffer-read-only (failed t))
	(widen)
	(erase-buffer)
	(dired-readin-insert dir-or-list)
	(indent-rigidly (point-min) (point-max) 2)
	;; We need this to make the root dir have a header line as all
	;; other subdirs have:
	(goto-char (point-min))
	(dired-insert-headerline default-directory)
	;; can't run dired-after-readin-hook here, it may depend on the subdir
	;; alist to be OK.
	)
      (message "Reading directory %s...done" dirname)
      ;; Must first make alist buffer local and set it to nil because
      ;; dired-build-subdir-alist will call dired-clear-alist first
      (set (make-local-variable 'dired-subdir-alist) nil)
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      (dired-build-subdir-alist)
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      (let ((attributes (file-attributes dirname)))
	(if (eq (car attributes) t)
	    (set-visited-file-modtime (nth 5 attributes))))
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      (set-buffer-modified-p nil))))
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;; Subroutines of dired-readin

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(defun dired-readin-insert (dir-or-list)
  ;; Just insert listing for the passed-in directory or
  ;; directory-and-file list, assuming a clean buffer.
  (let (dirname)
    (if (consp dir-or-list)
	(setq dirname (car dir-or-list))
      (setq dirname dir-or-list))
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    ;; Expand before comparing in case one or both have been abbreviated.
    (if (and (equal (expand-file-name default-directory)
		    (expand-file-name dirname))
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	     (not (consp dir-or-list)))
	;; If we are reading a whole single directory...
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	(dired-insert-directory dir-or-list dired-actual-switches nil t)
      (if (not (file-readable-p
		(directory-file-name (file-name-directory dirname))))
	  (error "Directory %s inaccessible or nonexistent" dirname)
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	;; Else assume it contains wildcards,
	;; unless it is an explicit list of files.
	(dired-insert-directory dir-or-list dired-actual-switches
				(not (listp dir-or-list)))
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	(save-excursion		;; insert wildcard instead of total line:
	  (goto-char (point-min))
	  (insert "wildcard " (file-name-nondirectory dirname) "\n"))))))

(defun dired-insert-directory (dir-or-list switches &optional wildcard full-p)
  ;; Do the right thing whether dir-or-list is atomic or not.  If it is,
  ;; inset all files listed in the cdr (the car is the passed-in directory
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  ;; list).
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  (let ((opoint (point))
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	(process-environment (copy-sequence process-environment))
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	end)
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    ;; We used to specify the C locale here, to force English month names;
    ;; but this should not be necessary any more,
    ;; with the new value of dired-move-to-filename-regexp.
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    (if (consp dir-or-list)
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	;; In this case, use the file names in the cdr
	;; exactly as originally given to dired-noselect.
	(mapcar
	 (function (lambda (x) (insert-directory x switches wildcard full-p)))
	 (cdr dir-or-list))
      ;; Expand the file name here because it may have been abbreviated
      ;; in dired-noselect.
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      (insert-directory (expand-file-name dir-or-list) switches wildcard full-p))
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    ;; Quote certain characters, unless ls quoted them for us.
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    (if (not (string-match "b" dired-actual-switches))
	(save-excursion
	  (setq end (point-marker))
	  (goto-char opoint)
	  (while (search-forward "\\" end t)
	    (replace-match "\\\\" nil t))
	  (goto-char opoint)
	  (while (search-forward "\^m" end t)
	    (replace-match "\\015" nil t))
	  (set-marker end nil)))
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    (dired-insert-set-properties opoint (point)))
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  (setq dired-directory dir-or-list))
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;; Make the file names highlight when the mouse is on them.
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(defun dired-insert-set-properties (beg end)
  (save-excursion
    (goto-char beg)
    (while (< (point) end)
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      (condition-case nil
	  (if (dired-move-to-filename)
	      (put-text-property (point)
				 (save-excursion
				   (dired-move-to-end-of-filename)
				   (point))
				 'mouse-face 'highlight))
	(error nil))
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      (forward-line 1))))

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(defun dired-insert-headerline (dir);; also used by dired-insert-subdir
  ;; Insert DIR's headerline with no trailing slash, exactly like ls
  ;; would, and put cursor where dired-build-subdir-alist puts subdir
  ;; boundaries.
  (save-excursion (insert "  " (directory-file-name dir) ":\n")))


;; Reverting a dired buffer

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(defun dired-revert (&optional arg noconfirm)
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  ;; Reread the dired buffer.  Must also be called after
  ;; dired-actual-switches have changed.
  ;; Should not fail even on completely garbaged buffers.
  ;; Preserves old cursor, marks/flags, hidden-p.
  (widen)				; just in case user narrowed
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  (let ((opoint (point))
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	(ofile (dired-get-filename nil t))
	(mark-alist nil)		; save marked files
	(hidden-subdirs (dired-remember-hidden))
	(old-subdir-alist (cdr (reverse dired-subdir-alist))) ; except pwd
	(case-fold-search nil)		; we check for upper case ls flags
	buffer-read-only)
    (goto-char (point-min))
    (setq mark-alist;; only after dired-remember-hidden since this unhides:
	  (dired-remember-marks (point-min) (point-max)))
    ;; treat top level dir extra (it may contain wildcards)
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    (dired-uncache
     (if (consp dired-directory) (car dired-directory) dired-directory))
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    (dired-readin dired-directory (current-buffer))
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    (let ((dired-after-readin-hook nil))
      ;; don't run that hook for each subdir...
      (dired-insert-old-subdirs old-subdir-alist))
    (dired-mark-remembered mark-alist)	; mark files that were marked
    ;; ... run the hook for the whole buffer, and only after markers
    ;; have been reinserted (else omitting in dired-x would omit marked files)
    (run-hooks 'dired-after-readin-hook)	; no need to narrow
    (or (and ofile (dired-goto-file ofile)) ; move cursor to where it
	(goto-char opoint))		; was before
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    (dired-move-to-filename)
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    (save-excursion			; hide subdirs that were hidden
      (mapcar (function (lambda (dir)
			  (if (dired-goto-subdir dir)
			      (dired-hide-subdir 1))))
	      hidden-subdirs)))
  ;; outside of the let scope
;;; Might as well not override the user if the user changed this.
;;;  (setq buffer-read-only t)
  )

;; Subroutines of dired-revert
;; Some of these are also used when inserting subdirs.

(defun dired-remember-marks (beg end)
  ;; Return alist of files and their marks, from BEG to END.
  (if selective-display			; must unhide to make this work.
      (let (buffer-read-only)
	(subst-char-in-region beg end ?\r ?\n)))
  (let (fil chr alist)
    (save-excursion
      (goto-char beg)
      (while (re-search-forward dired-re-mark end t)
	(if (setq fil (dired-get-filename nil t))
	    (setq chr (preceding-char)
		  alist (cons (cons fil chr) alist)))))
    alist))

;; Mark all files remembered in ALIST.
;; Each element of ALIST looks like (FILE . MARKERCHAR).
(defun dired-mark-remembered (alist)
  (let (elt fil chr)
    (while alist
      (setq elt (car alist)
	    alist (cdr alist)
	    fil (car elt)
	    chr (cdr elt))
      (if (dired-goto-file fil)
	  (save-excursion
	    (beginning-of-line)
	    (delete-char 1)
	    (insert chr))))))

;; Return a list of names of subdirs currently hidden.
(defun dired-remember-hidden ()
  (let ((l dired-subdir-alist) dir pos result)
    (while l
      (setq dir (car (car l))
	    pos (cdr (car l))
	    l (cdr l))
      (goto-char pos)
      (skip-chars-forward "^\r\n")
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      (if (eq (following-char) ?\r)
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	  (setq result (cons dir result))))
    result))

;; Try to insert all subdirs that were displayed before,
;; according to the former subdir alist OLD-SUBDIR-ALIST.
(defun dired-insert-old-subdirs (old-subdir-alist)
  (or (string-match "R" dired-actual-switches)
      (let (elt dir)
	(while old-subdir-alist
	  (setq elt (car old-subdir-alist)
		old-subdir-alist (cdr old-subdir-alist)
		dir (car elt))
	  (condition-case ()
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	      (progn
		(dired-uncache dir)
		(dired-insert-subdir dir))
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	    (error nil))))))
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;; Remove directory DIR from any directory cache.
(defun dired-uncache (dir)
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  (let ((handler (find-file-name-handler dir 'dired-uncache)))
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    (if handler
	(funcall handler 'dired-uncache dir))))
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;; dired mode key bindings and initialization
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(defvar dired-mode-map nil "Local keymap for dired-mode buffers.")
(if dired-mode-map
    nil
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  ;; This looks ugly when substitute-command-keys uses C-d instead d:
  ;;  (define-key dired-mode-map "\C-d" 'dired-flag-file-deletion)

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  (let ((map (make-keymap)))
    (suppress-keymap map)
    (define-key map [mouse-2] 'dired-mouse-find-file-other-window)
    ;; Commands to mark or flag certain categories of files
    (define-key map "#" 'dired-flag-auto-save-files)
    (define-key map "." 'dired-clean-directory)
    (define-key map "~" 'dired-flag-backup-files)
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    (define-key map "&" 'dired-flag-garbage-files)
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    ;; Upper case keys (except !) for operating on the marked files
    (define-key map "A" 'dired-do-search)
    (define-key map "C" 'dired-do-copy)
    (define-key map "B" 'dired-do-byte-compile)
    (define-key map "D" 'dired-do-delete)
    (define-key map "G" 'dired-do-chgrp)
    (define-key map "H" 'dired-do-hardlink)
    (define-key map "L" 'dired-do-load)
    (define-key map "M" 'dired-do-chmod)
    (define-key map "O" 'dired-do-chown)
    (define-key map "P" 'dired-do-print)
    (define-key map "Q" 'dired-do-query-replace)
    (define-key map "R" 'dired-do-rename)
    (define-key map "S" 'dired-do-symlink)
    (define-key map "X" 'dired-do-shell-command)
    (define-key map "Z" 'dired-do-compress)
    (define-key map "!" 'dired-do-shell-command)
    ;; Comparison commands
    (define-key map "=" 'dired-diff)
    (define-key map "\M-=" 'dired-backup-diff)
    ;; Tree Dired commands
    (define-key map "\M-\C-?" 'dired-unmark-all-files)
    (define-key map "\M-\C-d" 'dired-tree-down)
    (define-key map "\M-\C-u" 'dired-tree-up)
    (define-key map "\M-\C-n" 'dired-next-subdir)
    (define-key map "\M-\C-p" 'dired-prev-subdir)
    ;; move to marked files
    (define-key map "\M-{" 'dired-prev-marked-file)
    (define-key map "\M-}" 'dired-next-marked-file)
    ;; Make all regexp commands share a `%' prefix:
    ;; We used to get to the submap via a symbol dired-regexp-prefix,
    ;; but that seems to serve little purpose, and copy-keymap
    ;; does a better job without it.
    (define-key map "%" nil)
    (define-key map "%u" 'dired-upcase)
    (define-key map "%l" 'dired-downcase)
    (define-key map "%d" 'dired-flag-files-regexp)
    (define-key map "%m" 'dired-mark-files-regexp)
    (define-key map "%r" 'dired-do-rename-regexp)
    (define-key map "%C" 'dired-do-copy-regexp)
    (define-key map "%H" 'dired-do-hardlink-regexp)
    (define-key map "%R" 'dired-do-rename-regexp)
    (define-key map "%S" 'dired-do-symlink-regexp)
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    ;; Commands for marking and unmarking.
    (define-key map "*" nil)
    (define-key map "**" 'dired-mark-executables)
    (define-key map "*/" 'dired-mark-directories)
    (define-key map "*@" 'dired-mark-symlinks)
    (define-key map "*%" 'dired-mark-files-regexp)
    (define-key map "*c" 'dired-change-marks)
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    (define-key map "*s" 'dired-mark-subdir-files)
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    (define-key map "*m" 'dired-mark)
    (define-key map "*u" 'dired-unmark)
    (define-key map "*?" 'dired-unmark-all-files)
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    (define-key map "*!" 'dired-unmark-all-marks)
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    (define-key map "*\177" 'dired-unmark-backward)
    (define-key map "*\C-n" 'dired-next-marked-file)
    (define-key map "*\C-p" 'dired-prev-marked-file)
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    ;; Lower keys for commands not operating on all the marked files
    (define-key map "d" 'dired-flag-file-deletion)
    (define-key map "e" 'dired-find-file)
    (define-key map "f" 'dired-find-file)
    (define-key map "\C-m" 'dired-advertised-find-file)
    (define-key map "g" 'revert-buffer)
    (define-key map "h" 'describe-mode)
    (define-key map "i" 'dired-maybe-insert-subdir)
    (define-key map "k" 'dired-do-kill-lines)
    (define-key map "l" 'dired-do-redisplay)
    (define-key map "m" 'dired-mark)
    (define-key map "n" 'dired-next-line)
    (define-key map "o" 'dired-find-file-other-window)
    (define-key map "\C-o" 'dired-display-file)
    (define-key map "p" 'dired-previous-line)
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    (define-key map "q" 'quit-window)
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    (define-key map "s" 'dired-sort-toggle-or-edit)
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    (define-key map "t" 'dired-do-toggle)
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    (define-key map "u" 'dired-unmark)
    (define-key map "v" 'dired-view-file)
    (define-key map "x" 'dired-do-flagged-delete)
    (define-key map "+" 'dired-create-directory)
    ;; moving
    (define-key map "<" 'dired-prev-dirline)
    (define-key map ">" 'dired-next-dirline)
    (define-key map "^" 'dired-up-directory)
    (define-key map " "  'dired-next-line)
    (define-key map "\C-n" 'dired-next-line)
    (define-key map "\C-p" 'dired-previous-line)
    (define-key map [down] 'dired-next-line)
    (define-key map [up] 'dired-previous-line)
    ;; hiding
    (define-key map "$" 'dired-hide-subdir)
    (define-key map "\M-$" 'dired-hide-all)
    ;; misc
    (define-key map "?" 'dired-summary)
    (define-key map "\177" 'dired-unmark-backward)
    (define-key map "\C-_" 'dired-undo)
    (define-key map "\C-xu" 'dired-undo)

    ;; Make menu bar items.

    ;; Get rid of the Edit menu bar item to save space.
    (define-key map [menu-bar edit] 'undefined)

    (define-key map [menu-bar subdir]
      (cons "Subdir" (make-sparse-keymap "Subdir")))

    (define-key map [menu-bar subdir hide-all]
      '("Hide All" . dired-hide-all))
    (define-key map [menu-bar subdir hide-subdir]
      '("Hide Subdir" . dired-hide-subdir))
    (define-key map [menu-bar subdir tree-down]
      '("Tree Down" . dired-tree-down))
    (define-key map [menu-bar subdir tree-up]
      '("Tree Up" . dired-tree-up))
    (define-key map [menu-bar subdir up]
      '("Up Directory" . dired-up-directory))
    (define-key map [menu-bar subdir prev-subdir]
      '("Prev Subdir" . dired-prev-subdir))
    (define-key map [menu-bar subdir next-subdir]
      '("Next Subdir" . dired-next-subdir))
    (define-key map [menu-bar subdir prev-dirline]
      '("Prev Dirline" . dired-prev-dirline))
    (define-key map [menu-bar subdir next-dirline]
      '("Next Dirline" . dired-next-dirline))
    (define-key map [menu-bar subdir insert]
      '("Insert This Subdir" . dired-maybe-insert-subdir))

    (define-key map [menu-bar immediate]
      (cons "Immediate" (make-sparse-keymap "Immediate")))

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    (define-key map [menu-bar immediate revert-buffer]
      '("Update Buffer" . revert-buffer))

    (define-key map [menu-bar immediate dashes]
      '("--"))

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    (define-key map [menu-bar immediate backup-diff]
      '("Compare with Backup" . dired-backup-diff))
    (define-key map [menu-bar immediate diff]
      '("Diff" . dired-diff))
    (define-key map [menu-bar immediate view]
      '("View This File" . dired-view-file))
    (define-key map [menu-bar immediate display]
      '("Display in Other Window" . dired-display-file))
    (define-key map [menu-bar immediate find-file-other-window]
      '("Find in Other Window" . dired-find-file-other-window))
    (define-key map [menu-bar immediate find-file]
      '("Find This File" . dired-find-file))
    (define-key map [menu-bar immediate create-directory]
      '("Create Directory..." . dired-create-directory))

    (define-key map [menu-bar regexp]
      (cons "Regexp" (make-sparse-keymap "Regexp")))

    (define-key map [menu-bar regexp downcase]
      '("Downcase" . dired-downcase))
    (define-key map [menu-bar regexp upcase]
      '("Upcase" . dired-upcase))
    (define-key map [menu-bar regexp hardlink]
      '("Hardlink..." . dired-do-hardlink-regexp))
    (define-key map [menu-bar regexp symlink]
      '("Symlink..." . dired-do-symlink-regexp))
    (define-key map [menu-bar regexp rename]
      '("Rename..." . dired-do-rename-regexp))
    (define-key map [menu-bar regexp copy]
      '("Copy..." . dired-do-copy-regexp))
    (define-key map [menu-bar regexp flag]
      '("Flag..." . dired-flag-files-regexp))
    (define-key map [menu-bar regexp mark]
      '("Mark..." . dired-mark-files-regexp))

    (define-key map [menu-bar mark]
      (cons "Mark" (make-sparse-keymap "Mark")))

    (define-key map [menu-bar mark prev]
      '("Previous Marked" . dired-prev-marked-file))
    (define-key map [menu-bar mark next]
      '("Next Marked" . dired-next-marked-file))
    (define-key map [menu-bar mark marks]
      '("Change Marks..." . dired-change-marks))
    (define-key map [menu-bar mark unmark-all]
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      '("Unmark All" . dired-unmark-all-marks))
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    (define-key map [menu-bar mark symlinks]
      '("Mark Symlinks" . dired-mark-symlinks))
    (define-key map [menu-bar mark directories]
      '("Mark Directories" . dired-mark-directories))
    (define-key map [menu-bar mark directory]
      '("Mark Old Backups" . dired-clean-directory))
    (define-key map [menu-bar mark executables]
      '("Mark Executables" . dired-mark-executables))
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    (define-key map [menu-bar mark garbage-files]
      '("Flag Garbage Files" . dired-flag-garbage-files))
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    (define-key map [menu-bar mark backup-files]
      '("Flag Backup Files" . dired-flag-backup-files))
    (define-key map [menu-bar mark auto-save-files]
      '("Flag Auto-save Files" . dired-flag-auto-save-files))
    (define-key map [menu-bar mark deletion]
      '("Flag" . dired-flag-file-deletion))
    (define-key map [menu-bar mark unmark]
      '("Unmark" . dired-unmark))
    (define-key map [menu-bar mark mark]
      '("Mark" . dired-mark))
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    (define-key map [menu-bar mark toggle-marks]
      '("Toggle Marks" . dired-do-toggle))
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    (define-key map [menu-bar operate]
      (cons "Operate" (make-sparse-keymap "Operate")))

    (define-key map [menu-bar operate query-replace]
      '("Query Replace in Files..." . dired-do-query-replace))
    (define-key map [menu-bar operate search]
      '("Search Files..." . dired-do-search))
    (define-key map [menu-bar operate chown]
      '("Change Owner..." . dired-do-chown))
    (define-key map [menu-bar operate chgrp]
      '("Change Group..." . dired-do-chgrp))
    (define-key map [menu-bar operate chmod]
      '("Change Mode..." . dired-do-chmod))
    (define-key map [menu-bar operate load]
      '("Load" . dired-do-load))
    (define-key map [menu-bar operate compile]
      '("Byte-compile" . dired-do-byte-compile))
    (define-key map [menu-bar operate compress]
      '("Compress" . dired-do-compress))
    (define-key map [menu-bar operate print]
      '("Print" . dired-do-print))
    (define-key map [menu-bar operate hardlink]
      '("Hardlink to..." . dired-do-hardlink))
    (define-key map [menu-bar operate symlink]
      '("Symlink to..." . dired-do-symlink))
    (define-key map [menu-bar operate command]
      '("Shell Command..." . dired-do-shell-command))
    (define-key map [menu-bar operate delete]
      '("Delete" . dired-do-delete))
    (define-key map [menu-bar operate rename]
      '("Rename to..." . dired-do-rename))
    (define-key map [menu-bar operate copy]
      '("Copy to..." . dired-do-copy))

    (setq dired-mode-map map)))
1061

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;; Dired mode is suitable only for specially formatted data.
(put 'dired-mode 'mode-class 'special)

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(defun dired-mode (&optional dirname switches)
  "\
Mode for \"editing\" directory listings.
In dired, you are \"editing\" a list of the files in a directory and
  \(optionally) its subdirectories, in the format of `ls -lR'.
  Each directory is a page: use \\[backward-page] and \\[forward-page] to move pagewise.
\"Editing\" means that you can run shell commands on files, visit,
  compress, load or byte-compile them, change their file attributes
  and insert subdirectories into the same buffer.  You can \"mark\"
  files for later commands or \"flag\" them for deletion, either file
  by file or all files matching certain criteria.
You can move using the usual cursor motion commands.\\<dired-mode-map>
Letters no longer insert themselves.  Digits are prefix arguments.
Instead, type \\[dired-flag-file-deletion] to flag a file for Deletion.
Type \\[dired-mark] to Mark a file or subdirectory for later commands.
  Most commands operate on the marked files and use the current file
  if no files are marked.  Use a numeric prefix argument to operate on
  the next ARG (or previous -ARG if ARG<0) files, or just `1'
  to operate on the current file only.  Prefix arguments override marks.
  Mark-using commands display a list of failures afterwards.  Type \\[dired-summary]
  to see why something went wrong.
Type \\[dired-unmark] to Unmark a file or all files of a subdirectory.
Type \\[dired-unmark-backward] to back up one line and unflag.
Type \\[dired-do-flagged-delete] to eXecute the deletions requested.
Type \\[dired-advertised-find-file] to Find the current line's file
  (or dired it in another buffer, if it is a directory).
Type \\[dired-find-file-other-window] to find file or dired directory in Other window.
Type \\[dired-maybe-insert-subdir] to Insert a subdirectory in this buffer.
Type \\[dired-do-rename] to Rename a file or move the marked files to another directory.
Type \\[dired-do-copy] to Copy files.
Type \\[dired-sort-toggle-or-edit] to toggle sorting by name/date or change the `ls' switches.
Type \\[revert-buffer] to read all currently expanded directories again.
  This retains all marks and hides subdirs again that were hidden before.
SPC and DEL can be used to move down and up by lines.

If dired ever gets confused, you can either type \\[revert-buffer] \
to read the
directories again, type \\[dired-do-redisplay] \
to relist a single or the marked files or a
subdirectory, or type \\[dired-build-subdir-alist] to parse the buffer
again for the directory tree.

Customization variables (rename this buffer and type \\[describe-variable] on each line
for more info):

  dired-listing-switches
  dired-trivial-filenames
  dired-shrink-to-fit
  dired-marker-char
  dired-del-marker
  dired-keep-marker-rename
  dired-keep-marker-copy
  dired-keep-marker-hardlink
  dired-keep-marker-symlink

Hooks (use \\[describe-variable] to see their documentation):

  dired-before-readin-hook
  dired-after-readin-hook
  dired-mode-hook
  dired-load-hook

Keybindings:
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\\{dired-mode-map}"
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  ;; Not to be called interactively (e.g. dired-directory will be set
  ;; to default-directory, which is wrong with wildcards).
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  (kill-all-local-variables)
  (use-local-map dired-mode-map)
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  (dired-advertise)			; default-directory is already set
  (setq major-mode 'dired-mode
	mode-name "Dired"
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;;	case-fold-search nil
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	buffer-read-only t
	selective-display t		; for subdirectory hiding
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	mode-line-buffer-identification '("%17b"))
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  (set (make-local-variable 'revert-buffer-function)
       (function dired-revert))
  (set (make-local-variable 'page-delimiter)
       "\n\n")
  (set (make-local-variable 'dired-directory)
       (or dirname default-directory))
  ;; list-buffers uses this to display the dir being edited in this buffer.
  (set (make-local-variable 'list-buffers-directory)
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       (expand-file-name dired-directory))
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  (set (make-local-variable 'dired-actual-switches)
       (or switches dired-listing-switches))
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  (set (make-local-variable 'font-lock-defaults) '(dired-font-lock-keywords t))
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  (dired-sort-other dired-actual-switches t)
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  (run-hooks 'dired-mode-hook))

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;; Idiosyncratic dired commands that don't deal with marks.
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(defun dired-summary ()
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  "Summarize basic Dired commands and show recent Dired errors."
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  (interactive)
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  (dired-why)
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  ;>> this should check the key-bindings and use substitute-command-keys if non-standard
  (message
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   "d-elete, u-ndelete, x-punge, f-ind, o-ther window, R-ename, C-opy, h-elp"))
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(defun dired-undo ()
  "Undo in a dired buffer.
This doesn't recover lost files, it just undoes changes in the buffer itself.
You can use it to recover marks, killed lines or subdirs.
In the latter case, you have to do \\[dired-build-subdir-alist] to
parse the buffer again."
  (interactive)
  (let (buffer-read-only)
    (undo)))
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(defun dired-next-line (arg)
  "Move down lines then position at filename.
Optional prefix ARG says how many lines to move; default is one line."
  (interactive "p")
  (next-line arg)
  (dired-move-to-filename))

(defun dired-previous-line (arg)
  "Move up lines then position at filename.
Optional prefix ARG says how many lines to move; default is one line."
  (interactive "p")
  (previous-line arg)
  (dired-move-to-filename))

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(defun dired-next-dirline (arg &optional opoint)
  "Goto ARG'th next directory file line."
  (interactive "p")
  (or opoint (setq opoint (point)))
  (if (if (> arg 0)
	  (re-search-forward dired-re-dir nil t arg)
	(beginning-of-line)
	(re-search-backward dired-re-dir nil t (- arg)))
      (dired-move-to-filename)		; user may type `i' or `f'
    (goto-char opoint)
    (error "No more subdirectories")))

(defun dired-prev-dirline (arg)
  "Goto ARG'th previous directory file line."
  (interactive "p")
  (dired-next-dirline (- arg)))

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(defun dired-up-directory (&optional other-window)
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  "Run dired on parent directory of current directory.
Find the parent directory either in this buffer or another buffer.
Creates a buffer if necessary."
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  (interactive "P")
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  (let* ((dir (dired-current-directory))
	 (up (file-name-directory (directory-file-name dir))))
    (or (dired-goto-file (directory-file-name dir))
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	;; Only try dired-goto-subdir if buffer has more than one dir.
	(and (cdr dired-subdir-alist)
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	     (dired-goto-subdir up))
	(progn
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	  (if other-window
	      (dired-other-window up)
	    (dired up))
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	  (dired-goto-file dir)))))
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;; Force `f' rather than `e' in the mode doc:
(defalias 'dired-advertised-find-file 'dired-find-file)
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(defun dired-find-file ()
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  "In dired, visit the file or directory named on this line."
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  (interactive)
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  (let ((file-name (file-name-sans-versions (dired-get-filename) t)))
    (if (file-exists-p file-name)
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	(find-file file-name)
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      (if (file-symlink-p file-name)
	  (error "File is a symlink to a nonexistent target")
	(error "File no longer exists; type `g' to update Dired buffer")))))
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(defun dired-mouse-find-file-other-window (event)
  "In dired, visit the file or directory name you click on."
  (interactive "e")
  (let (file)
    (save-excursion
      (set-buffer (window-buffer (posn-window (event-end event))))
      (save-excursion
	(goto-char (posn-point (event-end event)))
	(setq file (dired-get-filename))))
    (select-window (posn-window (event-end event)))
    (find-file-other-window (file-name-sans-versions file t))))

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(defun dired-view-file ()
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  "In dired, examine a file in view mode, returning to dired when done.
When file is a directory, show it in this buffer if it is inserted;
otherwise, display it in another buffer."
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  (interactive)
  (if (file-directory-p (dired-get-filename))
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