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;;; uniquify.el --- unique buffer names dependent on file name -*- lexical-binding: t -*-
;; Copyright (C) 1989, 1995-1997, 2001-2015 Free Software Foundation,
;; Inc.
;; Author: Dick King <>
;; Maintainer:
;; Keywords: files
;; Created: 15 May 86
;; Package: emacs
;; 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 3 of the License, 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
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <>.
;;; Commentary:
;; Emacs's traditional 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.
;;; Change Log:
;; Originally by Dick King <> 15 May 86
;; Converted for Emacs 18 by Stephen Gildea <>
;; 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 <> 15 Jun 94
;; Add kill-buffer-hook. Kenneth Manheimer <> 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 <> 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 <> 9 Sep 97
;; Add uniquify-list-buffers-directory-modes
;; Stefan Monnier <> 17 Nov 2000
;; Algorithm and data structure changed to reduce consing with lots of buffers
;; Francesco Potortì <> (ideas by rms and monnier) 2001-07-18
;; Valuable feedback was provided by
;; Paul Smith <>,
;; Alastair Burt <>,
;; Bob Weiner <>,
;; Albert L. Ting <>,
;; Bryan O'Sullivan <>.
;;; Code:
(eval-when-compile (require 'cl-lib))
;;; User-visible variables
(defgroup uniquify nil
"Unique buffer names dependent on file name."
:group 'files)
(defcustom uniquify-buffer-name-style 'post-forward-angle-brackets
"How to construct unique buffer names for files with the same base name.
The value can be one of: `forward', `reverse', `post-forward',
`post-forward-angle-brackets', or nil.
For example, the files `/foo/bar/mumble/name' and `/baz/quux/mumble/name'
would have the following buffer names in the various styles:
forward bar/mumble/name quux/mumble/name
reverse name\\mumble\\bar name\\mumble\\quux
post-forward name|bar/mumble name|quux/mumble
post-forward-angle-brackets name<bar/mumble> name<quux/mumble>
nil name name<2>
The \"mumble\" part may be stripped as well, depending on the
setting of `uniquify-strip-common-suffix'. For more options that
you can set, browse the `uniquify' custom group."
:type '(radio (const forward)
(const reverse)
(const post-forward)
(const post-forward-angle-brackets)
(const :tag "numeric suffixes" nil))
:version "24.4"
:require 'uniquify
:group 'uniquify)
(defcustom uniquify-after-kill-buffer-p t
"If non-nil, rerationalize buffer names after a buffer has been killed."
:type 'boolean
:group 'uniquify)
(defcustom uniquify-ask-about-buffer-names-p nil
"If non-nil, permit user to choose names for buffers with same base file.
If the user chooses to name a buffer, uniquification is preempted and no
other buffer names are changed."
:type 'boolean
:group 'uniquify)
;; The default value matches certain Gnus buffers.
(defcustom uniquify-ignore-buffers-re nil
"Regular expression matching buffer names that should not be uniquified.
For instance, set this to \"^draft-[0-9]+$\" to avoid having uniquify rename
draft buffers even if `uniquify-after-kill-buffer-p' is non-nil and the
visited file name isn't the same as that of the buffer."
:type '(choice (const :tag "Uniquify all buffers" nil) regexp)
:group 'uniquify)
(defcustom uniquify-min-dir-content 0
"Minimum number of directory name components included in buffer name."
:type 'integer
:group 'uniquify)
(defcustom uniquify-separator nil
"String separator for buffer name components.
When `uniquify-buffer-name-style' is `post-forward', separates
base file name from directory part in buffer names (default \"|\").
When `uniquify-buffer-name-style' is `reverse', separates all
file name components (default \"\\\")."
:type '(choice (const nil) string)
:group 'uniquify)
(defcustom uniquify-trailing-separator-p nil
"If non-nil, add a file name separator to dired buffer names.
If `uniquify-buffer-name-style' is `forward', add the separator at the end;
if it is `reverse', add the separator at the beginning; otherwise, this
variable is ignored."
:type 'boolean
:group 'uniquify)
(defcustom uniquify-strip-common-suffix
;; Using it when uniquify-min-dir-content>0 doesn't make much sense.
(eq 0 uniquify-min-dir-content)
"If non-nil, strip common directory suffixes of conflicting files.
E.g. if you open /a1/b/c/d and /a2/b/c/d, the buffer names will say
\"d|a1\" and \"d|a2\" instead of \"d|a1/b/c\" and \"d|a2/b/c\".
This can be handy when you have deep parallel hierarchies."
:type 'boolean
:group 'uniquify)
(defvar uniquify-list-buffers-directory-modes '(dired-mode cvs-mode vc-dir-mode)
"List of modes for which uniquify should obey `list-buffers-directory'.
That means that when `buffer-file-name' is set to nil, `list-buffers-directory'
contains the name of the directory which the buffer is visiting.")
;;; Utilities
;; uniquify-fix-list data structure
(cl-defstruct (uniquify-item
(:constructor nil) (:copier nil)
(:constructor uniquify-make-item
(base dirname buffer &optional proposed)))
base dirname buffer proposed)
;; Internal variables used free
(defvar uniquify-possibly-resolvable nil)
(defvar-local uniquify-managed nil
"Non-nil if the name of this buffer is managed by uniquify.
It actually holds the list of `uniquify-item's corresponding to the conflict.")
(put 'uniquify-managed 'permanent-local t)
;; Used in desktop.el to save the non-uniquified buffer name
(defun uniquify-buffer-base-name ()
"Return the base name of the current buffer.
Return nil if the buffer is not managed by uniquify."
(and uniquify-managed
(uniquify-item-base (car uniquify-managed))))
;;; Main entry point.
(defun uniquify-rationalize-file-buffer-names (base dirname newbuf)
"Make file buffer names unique by adding segments from file name.
If `uniquify-min-dir-content' > 0, always pulls that many
file name elements.
Arguments BASE, DIRNAME, and NEWBUF specify the new buffer that causes
this rationalization."
(list (if uniquify-managed
(uniquify-item-base (car uniquify-managed)) (buffer-name))
(uniquify-buffer-file-name (current-buffer))
;; Make sure we don't get confused by outdated uniquify-managed info in
;; this buffer.
(with-current-buffer newbuf (setq uniquify-managed nil))
(when dirname
(setq dirname (expand-file-name (directory-file-name dirname)))
(let ((fix-list (list (uniquify-make-item base dirname newbuf)))
(dolist (buffer (buffer-list))
(when (and (not (and uniquify-ignore-buffers-re
(string-match uniquify-ignore-buffers-re
(buffer-name buffer))))
;; Only try to rename buffers we actually manage.
(setq items (buffer-local-value 'uniquify-managed buffer))
(equal base (uniquify-item-base (car items)))
;; Don't re-add stuff we already have. Actually this
;; whole `and' test should only match at most once.
(not (memq (car items) fix-list)))
(unless (cdr items)
;; If there was no conflict, the buffer-name is equal to the
;; base-name and we may have missed a rename-buffer because
;; of code like in set-visited-file-name:
;; (or (string= new-name (buffer-name)) (rename-buffer new-name t))
;; So we need to refresh the dirname of the uniquify-item.
(setf (uniquify-item-dirname (car items))
(uniquify-item-buffer (car items))))
;; This shouldn't happen, but maybe there's no dirname any more.
(unless (uniquify-item-dirname (car items))
(with-current-buffer (uniquify-item-buffer (car items))
(setq uniquify-managed nil))
(setq items nil)))
;; In case we missed some calls to kill-buffer, there may be dead
;; buffers in uniquify-managed, so filter them out.
(setq items
(delq nil (mapcar
(lambda (item)
(if (buffer-live-p (uniquify-item-buffer item))
(setq fix-list (append fix-list items))))
;; selects buffers whose names may need changing, and others that
;; may conflict, then bring conflicting names together
(uniquify-rationalize fix-list))))
;; uniquify's version of buffer-file-name; result never contains trailing slash
(defun uniquify-buffer-file-name (buffer)
"Return name of directory, file BUFFER is visiting, or nil if none.
Works on ordinary file-visiting buffers and buffers whose mode is mentioned
in `uniquify-list-buffers-directory-modes', otherwise returns nil."
(with-current-buffer buffer
(let ((filename
(or buffer-file-name
(if (memq major-mode uniquify-list-buffers-directory-modes)
(when filename
(directory-file-name filename))))))))
(defun uniquify-rerationalize-w/o-cb (fix-list)
"Re-rationalize the buffers in FIX-LIST, but ignoring `current-buffer'."
(let ((new-fix-list nil))
(dolist (item fix-list)
(let ((buf (uniquify-item-buffer item)))
(unless (or (eq buf (current-buffer)) (not (buffer-live-p buf)))
(push item new-fix-list))))
(when new-fix-list
(uniquify-rationalize new-fix-list))))
(defun uniquify-rationalize (fix-list)
;; Set up uniquify to re-rationalize after killing/renaming
;; if there is a conflict.
(dolist (item fix-list)
(with-current-buffer (uniquify-item-buffer item)
;; Refresh the dirnames and proposed names.
(setf (uniquify-item-proposed item)
(uniquify-get-proposed-name (uniquify-item-base item)
(uniquify-item-dirname item)))
(setq uniquify-managed fix-list)))
;; Strip any shared last directory names of the dirname.
(when (and (cdr fix-list) uniquify-strip-common-suffix)
(let ((strip t))
(while (let* ((base (file-name-nondirectory
(uniquify-item-dirname (car fix-list))))
(items fix-list))
(when (> (length base) 0)
(while (and strip items)
(unless (equal base (file-name-nondirectory
(uniquify-item-dirname (pop items))))
(setq strip nil)))
;; It's all the same => strip.
(dolist (item (prog1 fix-list (setq fix-list nil)))
;; Create new items because the old ones are kept (with the true
;; `dirname') for later rerationalizing.
(push (uniquify-make-item (uniquify-item-base item)
(let ((f (file-name-directory
(uniquify-item-dirname item))))
(and f (directory-file-name f)))
(uniquify-item-buffer item)
(uniquify-item-proposed item))
;; If uniquify-min-dir-content is 0, this will end up just
;; passing fix-list to uniquify-rationalize-conflicting-sublist.
(uniquify-rationalize-a-list fix-list))
(defun uniquify-item-greaterp (item1 item2)
(string-lessp (uniquify-item-proposed item2)
(uniquify-item-proposed item1)))
(defun uniquify-rationalize-a-list (fix-list &optional depth)
(unless depth (setq depth uniquify-min-dir-content))
(let (conflicting-sublist ; all elements have the same proposed name
(old-proposed "")
;; Divide fix-list into items with same proposed names and pass them
;; to uniquify-rationalize-conflicting-sublist.
(dolist (item (sort (copy-sequence fix-list) 'uniquify-item-greaterp))
(setq proposed (uniquify-item-proposed item))
(unless (equal proposed old-proposed)
(uniquify-rationalize-conflicting-sublist conflicting-sublist
old-proposed depth)
(setq conflicting-sublist nil))
(push item conflicting-sublist)
(setq old-proposed proposed))
(uniquify-rationalize-conflicting-sublist conflicting-sublist
old-proposed depth)))
(defun uniquify-get-proposed-name (base dirname &optional depth)
(unless depth (setq depth uniquify-min-dir-content))
(cl-assert (equal (directory-file-name dirname) dirname)) ;No trailing slash.
;; Distinguish directories by adding extra separator.
(if (and uniquify-trailing-separator-p
(file-directory-p (expand-file-name base dirname))
(not (string-equal base "")))
(cond ((eq uniquify-buffer-name-style 'forward)
(setq base (file-name-as-directory base)))
;; (setq base (concat base "/")))
((eq uniquify-buffer-name-style 'reverse)
(setq base (concat (or uniquify-separator "\\") base)))))
(let ((extra-string nil)
(n depth))
(while (and (> n 0) dirname)
(let ((file (file-name-nondirectory dirname)))
(when (setq dirname (file-name-directory dirname))
(setq dirname (directory-file-name dirname)))
(setq n (1- n))
(push (if (zerop (length file)) ;nil or "".
(prog1 (or (file-remote-p dirname) "")
(setq dirname nil)) ;Could be `dirname' iso "".
(when (zerop n)
(if (and dirname extra-string
(equal dirname (file-name-directory dirname)))
;; We're just before the root. Let's add the leading / already.
;; With "/a/b"+"/c/d/b" this leads to "/a/b" and "d/b" but with
;; "/a/b"+"/c/a/b" this leads to "/a/b" and "a/b".
(push "" extra-string))
(setq uniquify-possibly-resolvable t))
((null extra-string) base)
((string-equal base "") ;Happens for dired buffers on the root directory.
(mapconcat 'identity extra-string "/"))
((eq uniquify-buffer-name-style 'reverse)
(mapconcat 'identity
(cons base (nreverse extra-string))
(or uniquify-separator "\\")))
((eq uniquify-buffer-name-style 'forward)
(mapconcat 'identity (nconc extra-string (list base))
((eq uniquify-buffer-name-style 'post-forward)
(concat base (or uniquify-separator "|")
(mapconcat 'identity extra-string "/")))
((eq uniquify-buffer-name-style 'post-forward-angle-brackets)
(concat base "<" (mapconcat 'identity extra-string "/")
(t (error "Bad value for uniquify-buffer-name-style: %s"
;; Deal with conflicting-sublist, all of whose elements have identical
;; "base" components.
(defun uniquify-rationalize-conflicting-sublist (conf-list old-name depth)
(when conf-list
(if (or (cdr conf-list)
;; Check that the proposed name doesn't conflict with some
;; existing buffer.
(let ((buf (get-buffer old-name)))
(and buf (not (eq buf (uniquify-item-buffer (car conf-list)))))))
(when uniquify-possibly-resolvable
(setq uniquify-possibly-resolvable nil
depth (1+ depth))
(dolist (item conf-list)
(setf (uniquify-item-proposed item)
(uniquify-item-base item)
(uniquify-item-dirname item)
(uniquify-rationalize-a-list conf-list depth))
(unless (string= old-name "")
(uniquify-rename-buffer (car conf-list) old-name)))))
(defun uniquify-rename-buffer (item newname)
(let ((buffer (uniquify-item-buffer item)))
(unless (equal newname (buffer-name buffer))
(with-current-buffer buffer
(let ((uniquify-buffer-name-style nil)) ;Avoid hooks on rename-buffer.
;; Pass the `unique' arg, so the advice doesn't mark it as unmanaged.
(rename-buffer newname t))))))
;;; Hooks from the rest of Emacs
(defun uniquify-maybe-rerationalize-w/o-cb ()
"Re-rationalize buffer names, ignoring current buffer."
(and (cdr uniquify-managed)
(uniquify-rerationalize-w/o-cb uniquify-managed)))
;; Buffer deletion
;; Rerationalize after a buffer is killed, to reduce coinciding buffer names.
;; This mechanism uses `kill-buffer-hook', which runs *before* deletion, so
;; it calls `uniquify-rerationalize-w/o-cb' to rerationalize the buffer list
;; ignoring the current buffer (which is going to be deleted anyway).
(defun uniquify-kill-buffer-function ()
"Re-rationalize buffer names, ignoring current buffer.
For use on `kill-buffer-hook'."
(and uniquify-after-kill-buffer-p
;; Ideally we'd like to add it buffer-locally, but that doesn't work
;; because kill-buffer-hook is not permanent-local :-(
;; FIXME kill-buffer-hook _is_ permanent-local in 22+.
(add-hook 'kill-buffer-hook 'uniquify-kill-buffer-function)
;; The logical place to put all this code is in generate-new-buffer-name.
;; It's written in C, so we would add a generate-new-buffer-name-function
;; which, if non-nil, would be called instead of the C. One problem with
;; that is that generate-new-buffer-name takes a potential buffer name as
;; its argument -- not other information, such as what file the buffer will
;; visit.
;; The below solution works because generate-new-buffer-name is called
;; only by rename-buffer (which, as of 19.29, is never called from C) and
;; generate-new-buffer, which is called only by Lisp functions
;; create-file-buffer and rename-uniquely. Rename-uniquely generally
;; isn't used for buffers visiting files, so it's sufficient to hook
;; rename-buffer and create-file-buffer. (Setting find-file-hook isn't
;; sufficient.)
(advice-add 'rename-buffer :around #'uniquify--rename-buffer-advice)
(defun uniquify--rename-buffer-advice (rb-fun newname &optional unique &rest args)
"Uniquify buffer names with parts of directory name."
(let ((retval (apply rb-fun newname unique args)))
(if (null unique)
;; Mark this buffer so it won't be renamed by uniquify.
(setq uniquify-managed nil)
(when uniquify-buffer-name-style
;; Rerationalize w.r.t the new name.
(uniquify-buffer-file-name (current-buffer))
(setq retval (buffer-name (current-buffer)))))
(advice-add 'create-file-buffer :around #'uniquify--create-file-buffer-advice)
(defun uniquify--create-file-buffer-advice (cfb-fun filename &rest args)
"Uniquify buffer names with parts of directory name."
(let ((retval (apply cfb-fun filename args)))
(if uniquify-buffer-name-style
(let ((filename (expand-file-name (directory-file-name filename))))
(file-name-nondirectory filename)
(file-name-directory filename) retval)))
;;; The End
(defun uniquify-unload-function ()
"Unload the uniquify library."
(let ((buffers nil))
(dolist (buf (buffer-list))
(set-buffer buf)
(when uniquify-managed
(push (cons buf (uniquify-item-base (car uniquify-managed))) buffers)))
(advice-remove 'rename-buffer #'uniquify--rename-buffer-advice)
(advice-remove 'create-file-buffer #'uniquify--create-file-buffer-advice)
(dolist (buf buffers)
(set-buffer (car buf))
(rename-buffer (cdr buf) t))))
;; continue standard unloading
(provide 'uniquify)
;;; uniquify.el ends here
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