;;; uniquify.el --- unique buffer names dependent on file name ;; Copyright (C) 1989, 1995, 1996, 1997, 2001, 2002, 2003, ;; 2004, 2005, 2006, 2007 Free Software Foundation, Inc. ;; Author: Dick King ;; Maintainer: FSF ;; Keywords: files ;; 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., 51 Franklin Street, Fifth Floor, ;; Boston, MA 02110-1301, 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. ;;; 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 Potort́ (ideas by rms and monnier) 2001-07-18 ;; Valuable feedback was provided by ;; Paul Smith , ;; Alastair Burt , ;; Bob Weiner , ;; Albert L. Ting , ;; gyro@reasoning.com, ;; Bryan O'Sullivan . ;;; Code: (eval-when-compile (require 'cl)) ;;; User-visible variables (defgroup uniquify nil "Unique buffer names dependent on file name." :group 'applications) (defcustom uniquify-buffer-name-style nil "*If non-nil, buffer names are uniquified with parts of directory name. The value determines the buffer name style and is one of `forward', `reverse', `post-forward', or `post-forward-angle-brackets'. For example, 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 name nil name name<2>" :type '(radio (const forward) (const reverse) (const post-forward) (const post-forward-angle-brackets) (const :tag "standard Emacs behavior (nil)" nil)) :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) "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 (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 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.") (make-variable-buffer-local 'uniquify-managed) (put 'uniquify-managed 'permanent-local t) ;;; 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." (interactive (list (if uniquify-managed (uniquify-item-base (car uniquify-managed)) (buffer-name)) (uniquify-buffer-file-name (current-buffer)) (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))) items) (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-buffer-file-name (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))) (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) list-buffers-directory)))) (when filename (directory-file-name (file-name-directory (expand-file-name (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))) strip)) ;; 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)) fix-list))))) ;; 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 "") proposed) ;; Divide fix-list into items with same proposed names and pass them ;; to uniquify-rationalize-conflicting-sublist. (dolist (item (sort 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)) (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 "" (setq dirname nil)) ;Could be `dirname' iso "". file) extra-string))) (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)) (cond ((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" uniquify-buffer-name-style))))) ;; 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-get-proposed-name (uniquify-item-base item) (uniquify-item-dirname item) depth))) (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 ;; 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.) (defadvice rename-buffer (after rename-buffer-uniquify activate) "Uniquify buffer names with parts of directory name." (uniquify-maybe-rerationalize-w/o-cb) (if (null (ad-get-arg 1)) ; no UNIQUE argument. ;; 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-rationalize-file-buffer-names (ad-get-arg 0) (uniquify-buffer-file-name (current-buffer)) (current-buffer)) (setq ad-return-value (buffer-name (current-buffer)))))) (defadvice create-file-buffer (after create-file-buffer-uniquify activate) "Uniquify buffer names with parts of directory name." (if uniquify-buffer-name-style (let ((filename (expand-file-name (directory-file-name (ad-get-arg 0))))) (uniquify-rationalize-file-buffer-names (file-name-nondirectory filename) (file-name-directory filename) ad-return-value)))) ;; Buffer deletion ;; Rerationalize after a buffer is killed, to reduce coinciding buffer names. ;; This mechanism uses `kill-buffer-hook', which runs *before* deletion. ;; That means that the kill-buffer-hook function cannot just delete the ;; buffer -- it has to set something to do the rationalization *later*. ;; It actually puts another function on `post-command-hook'. This other ;; function runs the rationalization and then removes itself from the hook. ;; Is there a better way to accomplish this? ;; (This ought to set some global variables so the work is done only for ;; buffers with names similar to the deleted buffer. -MDE) (defun uniquify-maybe-rerationalize-w/o-cb () "Re-rationalize buffer names, ignoring current buffer. For use on `kill-buffer-hook'." (if (and (cdr uniquify-managed) uniquify-buffer-name-style uniquify-after-kill-buffer-p) (uniquify-rerationalize-w/o-cb uniquify-managed))) ;; Ideally we'd like to add it buffer-locally, but that doesn't work ;; because kill-buffer-hook is not permanent-local :-( (add-hook 'kill-buffer-hook 'uniquify-maybe-rerationalize-w/o-cb) (provide 'uniquify) ;; arch-tag: e763faa3-56c9-4903-8eb8-26e1c45a0065 ;;; uniquify.el ends here