# edit-utils / uniquify.el

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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, load it or add (require 'uniquify) to your ".emacs" ;; 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 19, ;; 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 ;; Valuable feedback was provided by ;; Paul Smith , ;; Alastair Burt , ;; Bob Weiner , ;; Albert L. Ting , ;; gyro@reasoning.com, ;; Bryan O'Sullivan . ;;; Code: (provide 'uniquify) ;;; 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' (the default), 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)) :group 'uniquify) (defcustom uniquify-after-kill-buffer-p nil "*If non-nil, rerationalize buffer names after a buffer has been killed. This can be dangerous if Emacs Lisp code is keeping track of buffers by their names (rather than keeping pointers to the buffers themselves)." :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) (defcustom uniquify-ignore-buffers-re nil "*Regular expression matching buffer names that should not be uniquified. For instance, set this to \"^draft-[0-9]+$\" to avoid having uniquify rename draft buffers even if uniquify-after-kill-buffer-p' is non-nil and the visited file name isn't the same as that of the buffer." :type '(choice (const :tag "Uniquify all buffers" nil) regexp) :group 'uniquify) (defcustom uniquify-ignore-buffers-mode-re "^Info-mode$" "*Regexp matching names of major modes of buffers that should not be uniquified. For instance, set this to \"^\\\$$Info\\\$$\\\\|\\\$$message\\\$$-mode$\" to avoid having uniquify rename Info and mail message buffers." :type '(choice (const :tag "Uniquify all buffers" nil) regexp) :group 'uniquify) (defcustom uniquify-ignore-buffers-query-functions '(uniquify-ignore-buffers-re uniquify-ignore-buffers-mode-re) "*Functions to call to determine if a buffer name should not be uniquified. The functions are called with one argument, the buffer. If any function returns t, the buffer name is not uniquified." :type '(repeat (function :format "%v")) :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) ;;; Utilities (defmacro uniquify-push (item list) ( (setq (, list) (cons (, item) (, list))))) ;; For directories, return the last component, not the empty string. (defun uniquify-file-name-nondirectory (file-name) (file-name-nondirectory (directory-file-name file-name))) ;; uniquify-fix-list data structure (defmacro uniquify-fix-item-base (a) ( (car (, a)))) (defmacro uniquify-fix-item-filename (a) ( (car (cdr (, a))))) (defmacro uniquify-fix-item-buffer (a) ( (car (cdr (cdr (, a)))))) ;; Not a macro: passed to mapcar. (defun uniquify-fix-item-unrationalized-buffer (item) (or (car (cdr (cdr (cdr item)))) nil)) ;maybe better in the future (defun uniquify-fix-item-filename-lessp (fixlist1 fixlist2) (uniquify-filename-lessp (uniquify-fix-item-filename fixlist1) (uniquify-fix-item-filename fixlist2))) ;; Internal variables used free (defvar uniquify-non-file-buffer-names nil) (defvar uniquify-possibly-resolvable nil) ;;; Main entry point. (defun uniquify-rationalize-file-buffer-names (&optional newbuffile newbuf) "Makes file buffer names unique by adding segments from file name. If uniquify-min-dir-content' > 0, always pulls that many file name elements. Arguments cause only a subset of buffers to be renamed." (interactive) (let (fix-list uniquify-non-file-buffer-names) (let ((buffers (buffer-list))) (while buffers (let* ((buffer (car buffers)) (bfn (if (eq buffer newbuf) (and newbuffile (expand-file-name (if (file-directory-p newbuffile) (directory-file-name newbuffile) newbuffile))) (uniquify-buffer-file-name buffer))) (rawname (and bfn (uniquify-file-name-nondirectory bfn))) (deserving (and rawname (not (run-hook-with-args-until-success 'uniquify-ignore-buffers-query-functions buffer)) (or (not newbuffile) (equal rawname (uniquify-file-name-nondirectory newbuffile)))))) (if deserving (uniquify-push (list rawname bfn buffer nil) fix-list) (uniquify-push (list (buffer-name buffer)) uniquify-non-file-buffer-names))) (setq buffers (cdr buffers)))) ;; selects buffers whose names may need changing, and others that ;; may conflict. (setq fix-list (sort fix-list 'uniquify-fix-item-filename-lessp)) ;; bringing conflicting names together (uniquify-rationalize-a-list fix-list uniquify-min-dir-content) (mapcar 'uniquify-fix-item-unrationalized-buffer fix-list))) ;; uniquify's version of buffer-file-name; result never contains trailing slash (defun uniquify-buffer-file-name (buffer) "Return name of file BUFFER is visiting, or nil if none. Works on dired buffers and ordinary file-visiting buffers, but no others." (or (buffer-file-name buffer) (and (featurep 'dired) (save-excursion (set-buffer buffer) (and (eq major-mode 'dired-mode) ; do nothing if not a dired buffer (if (boundp 'list-buffers-directory) ; (XEmacs does define this!) (and list-buffers-directory (directory-file-name list-buffers-directory)) ;; don't use default-directory if dired-directory is nil (and dired-directory (expand-file-name (directory-file-name (if (consp dired-directory) (car dired-directory) dired-directory)))))))))) ;; This examines the filename components in reverse order. (defun uniquify-filename-lessp (s1 s2) (let ((s1f (uniquify-file-name-nondirectory s1)) (s2f (uniquify-file-name-nondirectory s2))) (and (not (equal s2f "")) (or (string-lessp s1f s2f) (and (equal s1f s2f) (let ((s1d (file-name-directory s1)) (s2d (file-name-directory s2))) (and (not (<= (length s2d) 1)) (or (<= (length s1d) 1) (uniquify-filename-lessp (substring s1d 0 -1) (substring s2d 0 -1)))))))))) (defun uniquify-rationalize-a-list (fix-list depth) (let (conflicting-sublist ; all elements have the same proposed name (old-name "") proposed-name uniquify-possibly-resolvable) (while fix-list (let ((item (car fix-list))) (setq proposed-name (uniquify-get-proposed-name item depth)) (if (not (equal proposed-name old-name)) (progn (uniquify-rationalize-conflicting-sublist conflicting-sublist old-name depth) (setq conflicting-sublist nil))) (uniquify-push item conflicting-sublist) (setq old-name proposed-name)) (setq fix-list (cdr fix-list))) (uniquify-rationalize-conflicting-sublist conflicting-sublist old-name depth))) (defvar uniquify-directory-matching-regexp (format "\$$^\\|%1s[^%1s]*\$$%1$s" (regexp-quote (string directory-sep-char)))) (defun uniquify-get-proposed-name (item depth) (let (index (extra-string "") (n depth) (base (uniquify-fix-item-base item)) (fn (uniquify-fix-item-filename item))) (while (and (> n 0) (setq index (string-match (concat uniquify-directory-matching-regexp (regexp-quote extra-string) (regexp-quote base) "\\'") fn))) (setq extra-string (substring fn (if (zerop index) 0 (1+ index)) ;; (- (length base)) fails for base = "". ;; Equivalently, we could have used ;; (apply 'substring ... ;; (and (not (string= "" base)) ;; (list (- (length base))))) (- (length fn) (length base))) n (1- n))) (if (zerop n) (setq uniquify-possibly-resolvable t)) ;; Distinguish directories by adding extra separator. (if (and uniquify-trailing-separator-p (file-directory-p fn) (not (string-equal base ""))) (cond ((eq uniquify-buffer-name-style 'forward) (setq base (concat base "/"))) ((eq uniquify-buffer-name-style 'reverse) (setq base (concat (or uniquify-separator "\\") base))))) ;; Trim trailing separator on directory part (if (and (not (string-equal extra-string "")) (or (eq uniquify-buffer-name-style 'post-forward) (eq uniquify-buffer-name-style 'post-forward-angle-brackets))) (setq extra-string (substring extra-string 0 (- (length extra-string) 1)))) (cond ((string-equal extra-string "") base) ((string-equal base "") extra-string) ((eq uniquify-buffer-name-style 'forward) (concat extra-string base)) ((eq uniquify-buffer-name-style 'reverse) (concat base (uniquify-reverse-components extra-string))) ((eq uniquify-buffer-name-style 'post-forward) (concat base (or uniquify-separator "|") extra-string)) ((eq uniquify-buffer-name-style 'post-forward-angle-brackets) (concat base "<" 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 (conflicting-sublist old-name depth) (or (null conflicting-sublist) (and (null (cdr conflicting-sublist)) (not (assoc old-name uniquify-non-file-buffer-names)) (or (and (not (string= old-name "")) (uniquify-rename-buffer (car conflicting-sublist) old-name)) t)) (if uniquify-possibly-resolvable (uniquify-rationalize-a-list conflicting-sublist (1+ depth))))) (defun uniquify-rename-buffer (item newname) (let ((buffer (uniquify-fix-item-buffer item))) (if (not (equal newname (buffer-name buffer))) (let ((unset (current-buffer)) ;; avoid hooks on rename-buffer (uniquify-buffer-name-style nil)) (set-buffer buffer) (rename-buffer newname) (set-buffer unset)))) (rplaca (nthcdr 3 item) t)) (defun uniquify-reverse-components (instring) (let ((sofar '()) (cursor 0) (len (length instring)) (sep (or uniquify-separator "\\"))) (while (< cursor len) (if (= (aref instring cursor) directory-sep-char) (setq sofar (cons sep sofar) cursor (1+ cursor)) (let ((first-dirsep (or (string-match (string directory-sep-char) instring cursor) len))) (setq sofar (cons (substring instring cursor first-dirsep) sofar) cursor first-dirsep)))) (apply (function concat) sofar))) ;;; 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-hooks isn't ;; sufficient.) (defadvice rename-buffer (after rename-buffer-uniquify activate) "Uniquify buffer names with parts of directory name." (if (and uniquify-buffer-name-style ;; UNIQUE argument (ad-get-arg 1)) (progn (if uniquify-after-kill-buffer-p ;; call with no argument; rationalize vs. old name as well as new (uniquify-rationalize-file-buffer-names) ;; call with argument: rationalize vs. new name only (uniquify-rationalize-file-buffer-names (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 (uniquify-rationalize-file-buffer-names (ad-get-arg 0) 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 delay-uniquify-rationalize-file-buffer-names () "Add delayed-uniquify-rationalize-file-buffer-names' to post-command-hook'. For use on, eg, kill-buffer-hook', to rationalize *after* buffer deletion." (if (and uniquify-buffer-name-style uniquify-after-kill-buffer-p) (add-hook 'post-command-hook 'delayed-uniquify-rationalize-file-buffer-names))) (defun delayed-uniquify-rationalize-file-buffer-names () "Rerationalize buffer names and remove self from post-command-hook'. See also delay-rationalize-file-buffer-names' for hook setter." (uniquify-rationalize-file-buffer-names) (remove-hook 'post-command-hook 'delayed-uniquify-rationalize-file-buffer-names)) (defun uniquify-ignore-buffers-re (buffer) "Returns t if the BUFFER's name matches uniquify-ignore-buffers-re'. Meant to be called from the uniquify-ignore-buffers-query-functions'." (and uniquify-ignore-buffers-re (string-match uniquify-ignore-buffers-re (buffer-name buffer)))) (defun uniquify-ignore-buffers-mode-re (buffer) "Returns t if the BUFFER's major mode matches uniquify-ignore-buffers-mode-re'. Meant to be called from the uniquify-ignore-buffers-query-functions'." (and uniquify-ignore-buffers-mode-re (string-match uniquify-ignore-buffers-mode-re (symbol-name (with-current-buffer buffer major-mode))))) (add-hook 'kill-buffer-hook 'delay-uniquify-rationalize-file-buffer-names) ;;; uniquify.el ends here `
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