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+;;; pcmpl-unix --- standard UNIX completions
+
+;; Copyright (C) 1999, 2000 Free Software Foundation
+
+;; 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.
+
+;;; Code:
+
+(provide 'pcmpl-unix)
+
+(require 'pcomplete)
+
+;; User Variables:
+
+(defcustom pcmpl-unix-group-file "/etc/group"
+  "*If non-nil, a string naming the group file on your system."
+  :type 'file
+  :group 'pcmpl-unix)
+
+(defcustom pcmpl-unix-passwd-file "/etc/passwd"
+  "*If non-nil, a string naming the passwd file on your system."
+  :type 'file
+  :group 'pcmpl-unix)
+
+;; Functions:
+
+;;;###autoload
+(defun pcomplete/cd ()
+  "Completion for `cd'."
+  (pcomplete-here (pcomplete-dirs)))
+
+;;;###autoload
+(defalias 'pcomplete/pushd 'pcomplete/cd)
+
+;;;###autoload
+(defun pcomplete/rmdir ()
+  "Completion for `rmdir'."
+  (while (pcomplete-here (pcomplete-dirs))))
+
+;;;###autoload
+(defun pcomplete/rm ()
+  "Completion for `rm'."
+  (let ((pcomplete-help "(fileutils)rm invocation"))
+    (pcomplete-opt "dfirRv")
+    (while (pcomplete-here (pcomplete-all-entries) nil
+			   'expand-file-name))))
+
+;;;###autoload
+(defun pcomplete/xargs ()
+  "Completion for `xargs'."
+  (pcomplete-here (funcall pcomplete-command-completion-function))
+  (funcall (or (pcomplete-find-completion-function (pcomplete-arg 1))
+	       pcomplete-default-completion-function)))
+
+;;;###autoload
+(defalias 'pcomplete/time 'pcomplete/xargs)
+
+;;;###autoload
+(defun pcomplete/which ()
+  "Completion for `which'."
+  (while (pcomplete-here (funcall pcomplete-command-completion-function))))
+
+(defun pcmpl-unix-read-passwd-file (file)
+  "Return an alist correlating gids to group names in FILE."
+  (let (names)
+    (when (file-readable-p file)
+      (with-temp-buffer
+	(insert-file-contents file)
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (let* ((fields
+		  (split-string (buffer-substring
+				 (point) (progn (end-of-line)
+						(point))) ":")))
+	    (setq names (cons (nth 0 fields) names)))
+	  (forward-line))))
+    (pcomplete-uniqify-list names)))
+
+(defsubst pcmpl-unix-group-names ()
+  "Read the contents of /etc/group for group names."
+  (if pcmpl-unix-group-file
+      (pcmpl-unix-read-passwd-file pcmpl-unix-group-file)))
+
+(defsubst pcmpl-unix-user-names ()
+  "Read the contents of /etc/passwd for user names."
+  (if pcmpl-unix-passwd-file
+      (pcmpl-unix-read-passwd-file pcmpl-unix-passwd-file)))
+
+;;;###autoload
+(defun pcomplete/chown ()
+  "Completion for the `chown' command."
+  (unless (pcomplete-match "\\`-")
+    (if (pcomplete-match "\\`[^.]*\\'" 0)
+	(pcomplete-here* (pcmpl-unix-user-names))
+      (if (pcomplete-match "\\.\\([^.]*\\)\\'" 0)
+	  (pcomplete-here* (pcmpl-unix-group-names)
+			   (pcomplete-match-string 1 0))
+	(pcomplete-here*))))
+  (while (pcomplete-here (pcomplete-entries))))
+
+;;;###autoload
+(defun pcomplete/chgrp ()
+  "Completion for the `chgrp' command."
+  (unless (pcomplete-match "\\`-")
+    (pcomplete-here* (pcmpl-unix-group-names)))
+  (while (pcomplete-here (pcomplete-entries))))
+
+;;; pcmpl-unix.el ends here