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[bpt/emacs.git] / lisp / uniquify.el

;;; uniquify.el --- unique buffer names dependent on file name

;; Copyright (c) 1989, 1995, 1996, 1997 Free Software Foundation, Inc.

;; Author: Dick King <king@reasoning.com>
;; Maintainer: FSF
;; Created: 15 May 86

;; 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:

;; Emacs's standard method for making buffer names unique adds <2>, <3>,
;; etc. to the end of (all but one of) the buffers.  This file replaces
;; that behavior, for buffers visiting files and dired buffers, with a
;; uniquification that adds parts of the file name until the buffer names
;; are unique.  For instance, buffers visiting /u/mernst/tmp/Makefile and
;; /usr/projects/zaphod/Makefile would be named Makefile|tmp and
;; Makefile|zaphod, respectively (instead of Makefile and Makefile<2>).
;; Other buffer name styles are also available.

;; To use this file, do (require 'uniquify)
;; and set uniquify-buffer-name-style to one of its non-nil alternative values.

;; For other options, see "User-visible variables", below.

;; A version of uniquify.el that works under Emacs 18, Emacs 19, XEmacs,
;; and InfoDock is available from the maintainer.

;; Doesn't work under NT when backslash is used as a path separator (forward
;;   slash path separator works fine).  To fix, check system-type against
;;   'windows-nt, write a routine that breaks paths down into components.
;;   (Surprisingly, there isn't one built in.)

;;; Change Log:

;; Originally by Dick King <king@reasoning.com> 15 May 86
;; Converted for Emacs 18 by Stephen Gildea <gildea@lcs.mit.edu>
;; Make uniquify-min-dir-content 0 truly non-invasive.  gildea 23 May 89
;; Some cleanup.  uniquify-min-dir-content default 0.  gildea 01 Jun 89
;; Don't rename to "".  Michael Ernst <mernst@theory.lcs.mit.edu> 15 Jun 94
;; Add kill-buffer-hook.  Kenneth Manheimer <ken.manheimer@nist.gov> 09 May 95
;; Add advice for rename-buffer and create-file-buffer, handle dired buffers,
;;  kill-buffer-rationalize-buffer-names-p, documentation.  mernst 24 May 95
;; Remove free variables, fix typos.  mernst 5 Jun 95
;; Efficiently support Emacs 19.27 & earlier.  ken.manheimer, mernst 10 Jun 95
;; Rename user options to "uniquify-...", add uniquify-reverse-dir-content-p,
;;  add uniquify-ask-about-buffer-names-p.  king, mernst 13 Jun 95
;; Prefix functions by "uniquify-..."; rename mnemonic-buffer-names to
;;  uniquify-buffer-name-style; add 'forward and 'post-forward-angle-brackets
;;  styles; remove uniquify-reverse-dir-content-p; add
;;  uniquify-trailing-separator-p.  mernst 4 Aug 95
;; Don't call expand-file-name on nil.  mernst 7 Jan 96
;; Check whether list-buffers-directory is bound.  mernst 11 Oct 96
;; Ignore non-file non-dired buffers. Colin Rafferty <craffert@ml.com> 3 Mar 97
;; Use last component, not "", for file name of directories.  mernst 27 Jun 97
;; Use directory-file-name; code cleanup.  mernst 6 Sep 97
;; Add uniquify-ignore-buffers-re.
;;  Andre Srinivasan <andre@visigenic.com> 9 Sep 97
;; Add uniquify-list-buffers-directory-modes
;;   Stefan Monnier <monnier@cs.yale.edu> 17 Nov 2000
;; Algorithm and data structure changed to reduce consing with lots of buffers