(ibuffer-diff-with-file): Just call `diff-buffer-with-file'.

[gnu-emacs] / lisp / ibuf-ext.el

;;; ibuf-ext.el --- extensions for ibuffer 

;; Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc.

;; Author: Colin Walters <walters@verbum.org>
;; Created: 2 Dec 2001
;; Keywords: buffer, convenience

;; This file is part of GNU Emacs.

;; This program 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.

;; This program 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 this program ; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; These functions should be automatically loaded when called, but you
;; can explicity (require 'ibuf-ext) in your ~/.emacs to have them
;; preloaded.

;;; Code:

(require 'ibuffer)

(eval-when-compile
  (require 'derived)
  (require 'ibuf-macs)
  (require 'cl))

;;; Utility functions
(defun ibuffer-delete-alist (key alist)
  "Delete all entries in ALIST that have a key equal to KEY."
  (let (entry)
    (while (setq entry (assoc key alist))
      (setq alist (delete entry alist)))
    alist))

(defun ibuffer-split-list (ibuffer-split-list-fn ibuffer-split-list-elts)
  (let ((hip-crowd nil)
        (lamers nil))
    (dolist (ibuffer-split-list-elt ibuffer-split-list-elts)
      (if (funcall ibuffer-split-list-fn ibuffer-split-list-elt) 
          (push ibuffer-split-list-elt hip-crowd)
        (push ibuffer-split-list-elt lamers)))
    ;; Too bad Emacs Lisp doesn't have multiple values.
    (list (nreverse hip-crowd) (nreverse lamers))))

(defcustom ibuffer-never-show-predicates nil
  "A list of predicates (a regexp or function) for buffers not to display.
If a regexp, then it will be matched against the buffer's name.
If a function, it will be called with the buffer as an argument, and
should return non-nil if this buffer should not be shown."
  :type '(repeat (choice regexp function))
  :group 'ibuffer)

(defcustom ibuffer-always-show-predicates nil
  "A list of predicates (a regexp or function) for buffers to always display.
If a regexp, then it will be matched against the buffer's name.
If a function, it will be called with the buffer as an argument, and
should return non-nil if this buffer should be shown.
Note that buffers matching one of these predicates will be shown
regardless of any active filters in this buffer."
  :type '(repeat (choice regexp function))
  :group 'ibuffer)

(defvar ibuffer-tmp-hide-regexps nil
  "A list of regexps which should match buffer names to not show.")
  
(defvar ibuffer-tmp-show-regexps nil
  "A list of regexps which should match buffer names to always show.")

(defvar ibuffer-auto-mode nil
  "If non-nil, Ibuffer auto-mode should be enabled for this buffer.
Do not set this variable directly!  Use the function
`ibuffer-auto-mode' instead.")

(defvar ibuffer-auto-buffers-changed nil)

(defcustom ibuffer-saved-filters '(("gnus"
                                    ((or (mode . message-mode)
                                         (mode . mail-mode)
                                         (mode . gnus-group-mode)
                                         (mode . gnus-summary-mode) 
                                         (mode . gnus-article-mode))))
                                   ("programming"
                                    ((or (mode . emacs-lisp-mode)
                                         (mode . cperl-mode)
                                         (mode . c-mode)
                                         (mode . java-mode) 
                                         (mode . idl-mode)
                                         (mode . lisp-mode)))))
                                  
  "An alist of filter qualifiers to switch between.

This variable should look like ((\"STRING\" QUALIFIERS)
                                (\"STRING\" QUALIFIERS) ...), where
QUALIFIERS is a list of the same form as
`ibuffer-filtering-qualifiers'.
See also the variables `ibuffer-filtering-qualifiers',
`ibuffer-filtering-alist', and the functions
`ibuffer-switch-to-saved-filters', `ibuffer-save-filters'."
  :type '(repeat sexp)
  :group 'ibuffer)

(defvar ibuffer-filtering-qualifiers nil
  "A list like (SYMBOL . QUALIFIER) which filters the current buffer list.
See also `ibuffer-filtering-alist'.")

;; This is now frobbed by `define-ibuffer-filter'.
(defvar ibuffer-filtering-alist nil
  "An alist of (SYMBOL DESCRIPTION FUNCTION) which describes a filter.

You most likely do not want to modify this variable directly; see
`define-ibuffer-filter'.

SYMBOL is the symbolic name of the filter.  DESCRIPTION is used when
displaying information to the user.  FUNCTION is given a buffer and
the value of the qualifier, and returns non-nil if and only if the
buffer should be displayed.")

(defcustom ibuffer-filter-format-alist nil
  "An alist which has special formats used when a filter is active.
The contents of this variable should look like:
 ((FILTER (FORMAT FORMAT ...)) (FILTER (FORMAT FORMAT ...)) ...)

For example, suppose that when you add a filter for buffers whose
major mode is `emacs-lisp-mode', you only want to see the mark and the
name of the buffer.  You could accomplish that by adding:
 (mode ((mark \" \" name)))
to this variable."
  :type '(repeat (list :tag "Association" (symbol :tag "Filter")
                       (list :tag "Formats" (repeat (sexp :tag "Format")))))
  :group 'ibuffer)

(defvar ibuffer-cached-filter-formats nil)
(defvar ibuffer-compiled-filter-formats nil)  

(defvar ibuffer-filter-groups nil
  "A list like ((\"NAME\" ((SYMBOL . QUALIFIER) ...) ...) which groups buffers.
The SYMBOL should be one from `ibuffer-filtering-alist'.
The QUALIFIER should be the same as QUALIFIER in
`ibuffer-filtering-qualifiers'.")

(defcustom ibuffer-show-empty-filter-groups t
  "If non-nil, then show the names of filter groups which are empty."
  :type 'boolean
  :group 'ibuffer)

(defcustom ibuffer-saved-filter-groups nil
                                  
  "An alist of filtering groups to switch between.

This variable should look like ((\"STRING\" QUALIFIERS)
                                (\"STRING\" QUALIFIERS) ...), where
QUALIFIERS is a list of the same form as
`ibuffer-filtering-qualifiers'.

See also the variables `ibuffer-filter-groups',
`ibuffer-filtering-qualifiers', `ibuffer-filtering-alist', and the
functions `ibuffer-switch-to-saved-filter-group',
`ibuffer-save-filter-group'."
  :type '(repeat sexp)
  :group 'ibuffer)

(defvar ibuffer-hidden-filter-groups nil
  "A list of filtering groups which are currently hidden.")

(defvar ibuffer-filter-group-kill-ring nil)

(defcustom ibuffer-old-time 72
  "The number of hours before a buffer is considered \"old\"."
  :type '(choice (const :tag "72 hours (3 days)" 72)
                 (const :tag "48 hours (2 days)" 48)
                 (const :tag "24 hours (1 day)" 24)
                 (integer :tag "hours"))
  :group 'ibuffer)

(defcustom ibuffer-save-with-custom t
  "If non-nil, then use Custom to save interactively changed variables.
Currently, this only applies to `ibuffer-saved-filters' and
`ibuffer-saved-filter-groups."
  :type 'boolean
  :group 'ibuffer)

(defun ibuffer-ext-visible-p (buf all &optional ibuffer-buf)
  (or
   (ibuffer-buf-matches-predicates buf ibuffer-tmp-show-regexps)
   (and (not
         (or
          (ibuffer-buf-matches-predicates buf ibuffer-tmp-hide-regexps)
          (ibuffer-buf-matches-predicates buf ibuffer-never-show-predicates)))
        (or all
            (not
             (ibuffer-buf-matches-predicates buf ibuffer-maybe-show-predicates)))
        (or ibuffer-view-ibuffer
            (and ibuffer-buf 
                 (not (eq ibuffer-buf buf))))
        (or
         (ibuffer-included-in-filters-p buf ibuffer-filtering-qualifiers)
         (ibuffer-buf-matches-predicates buf ibuffer-always-show-predicates)))))

(defun ibuffer-auto-update-changed ()
  (when ibuffer-auto-buffers-changed
    (setq ibuffer-auto-buffers-changed nil)
    (mapcar #'(lambda (buf)
                (ignore-errors
                  (with-current-buffer buf
                    (when (and ibuffer-auto-mode
                               (eq major-mode 'ibuffer-mode))
                      (ibuffer-update nil t)))))
            (buffer-list))))

;;;###autoload
(defun ibuffer-auto-mode (&optional arg)
  "Toggle use of Ibuffer's auto-update facility.
With numeric ARG, enable auto-update if and only if ARG is positive."
  (interactive)
  (unless (eq major-mode 'ibuffer-mode)
    (error "This buffer is not in Ibuffer mode"))
  (set (make-local-variable 'ibuffer-auto-mode)
       (if arg
           (plusp arg)
         (not ibuffer-auto-mode)))
  (defadvice get-buffer-create (after ibuffer-notify-create activate)
    (setq ibuffer-auto-buffers-changed t))
  (defadvice kill-buffer (after ibuffer-notify-kill activate)
    (setq ibuffer-auto-buffers-changed t))
  (add-hook 'post-command-hook 'ibuffer-auto-update-changed)
  (ibuffer-update-mode-name))

;;;###autoload
(defun ibuffer-mouse-filter-by-mode (event)
  "Enable or disable filtering by the major mode chosen via mouse."
  (interactive "e")
  (ibuffer-interactive-filter-by-mode event))

;;;###autoload
(defun ibuffer-interactive-filter-by-mode (event-or-point)
  "Enable or disable filtering by the major mode at point."
  (interactive "d")
  (if (eventp event-or-point)
      (mouse-set-point event-or-point)
    (goto-char event-or-point))
  (let ((buf (ibuffer-current-buffer)))
    (if (assq 'mode ibuffer-filtering-qualifiers)
        (setq ibuffer-filtering-qualifiers
              (ibuffer-delete-alist 'mode ibuffer-filtering-qualifiers))
      (ibuffer-push-filter (cons 'mode 
                                (with-current-buffer buf
                                  major-mode)))))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-mouse-toggle-filter-group (event)
  "Toggle the display status of the filter group chosen with the mouse."
  (interactive "e")
  (ibuffer-toggle-filter-group-1 (save-excursion
                                   (mouse-set-point event)
                                   (point))))

;;;###autoload
(defun ibuffer-toggle-filter-group ()
  "Toggle the display status of the filter group on this line."
  (interactive) 
  (ibuffer-toggle-filter-group-1 (point)))

(defun ibuffer-toggle-filter-group-1 (posn)     
  (let ((name (get-text-property posn 'ibuffer-filter-group-name)))
    (unless (stringp name)
      (error "No filtering group name present"))
    (if (member name ibuffer-hidden-filter-groups)
        (setq ibuffer-hidden-filter-groups
              (delete name ibuffer-hidden-filter-groups))
      (push name ibuffer-hidden-filter-groups))
    (ibuffer-update nil t)))

;;;###autoload
(defun ibuffer-forward-filter-group (&optional count)
  "Move point forwards by COUNT filtering groups."
  (interactive "P")
  (unless count
    (setq count 1))
  (when (> count 0)
    (when (get-text-property (point) 'ibuffer-filter-group-name)
      (goto-char (next-single-property-change
                  (point) 'ibuffer-filter-group-name
                  nil (point-max))))
    (goto-char (next-single-property-change
                (point) 'ibuffer-filter-group-name
                nil (point-max)))
    (ibuffer-forward-filter-group (1- count)))
  (ibuffer-forward-line 0))

;;;###autoload
(defun ibuffer-backward-filter-group (&optional count)
  "Move point backwards by COUNT filtering groups."
  (interactive "P")
  (unless count
    (setq count 1))
  (when (> count 0)
    (when (get-text-property (point) 'ibuffer-filter-group-name)
      (goto-char (previous-single-property-change
                  (point) 'ibuffer-filter-group-name
                  nil (point-min))))
    (goto-char (previous-single-property-change
                (point) 'ibuffer-filter-group-name
                nil (point-min)))
    (ibuffer-backward-filter-group (1- count)))
  (when (= (point) (point-min))
    (goto-char (point-max))
    (ibuffer-backward-filter-group 1))
  (ibuffer-forward-line 0))

;;;###autoload (autoload 'ibuffer-do-shell-command-pipe "ibuf-ext.el")
(define-ibuffer-op shell-command-pipe (command)
  "Pipe the contents of each marked buffer to shell command COMMAND."
  (:interactive "sPipe to shell command: "
   :opstring "Shell command executed on"
   :modifier-p nil)
  (shell-command-on-region
   (point-min) (point-max) command
   (get-buffer-create "* ibuffer-shell-output*")))

;;;###autoload (autoload 'ibuffer-do-shell-command-pipe-replace "ibuf-ext.el")
(define-ibuffer-op shell-command-pipe-replace (command)
  "Replace the contents of marked buffers with output of pipe to COMMAND."
  (:interactive "sPipe to shell command (replace): "
   :opstring "Buffer contents replaced in"
   :active-opstring "replace buffer contents in"
   :dangerous t
   :modifier-p t)
  (with-current-buffer buf
    (shell-command-on-region (point-min) (point-max)
                             command nil t)))

;;;###autoload (autoload 'ibuffer-do-shell-command-file "ibuf-ext.el")
(define-ibuffer-op shell-command-file (command)
  "Run shell command COMMAND separately on files of marked buffers."
  (:interactive "sShell command on buffer's file: "
   :opstring "Shell command executed on"
   :modifier-p nil)
  (shell-command (concat command " "
                         (shell-quote-argument
                          (if buffer-file-name
                              buffer-file-name
                            (make-temp-file
                             (substring (buffer-name) 0 (min 10 (length (buffer-name))))))))))

;;;###autoload (autoload 'ibuffer-do-eval "ibuf-ext.el")
(define-ibuffer-op eval (form)
  "Evaluate FORM in each of the buffers.
Does not display the buffer during evaluation. See
`ibuffer-do-view-and-eval' for that."
  (:interactive "xEval in buffers (form): "
   :opstring "evaluated in"
   :modifier-p :maybe)
  (eval form))

;;;###autoload (autoload 'ibuffer-do-view-and-eval "ibuf-ext.el")
(define-ibuffer-op view-and-eval (form)
  "Evaluate FORM while displaying each of the marked buffers.
To evaluate a form without viewing the buffer, see `ibuffer-do-eval'."
  (:interactive "xEval viewing buffers (form): "
   :opstring "evaluated in"
   :complex t
   :modifier-p :maybe)
  (let ((ibuffer-buf (current-buffer)))
    (unwind-protect
        (progn
          (switch-to-buffer buf)
          (eval form))
      (switch-to-buffer ibuffer-buf))))

;;;###autoload (autoload 'ibuffer-do-rename-uniquely "ibuf-ext.el")
(define-ibuffer-op rename-uniquely ()
  "Rename marked buffers as with `rename-uniquely'."
  (:opstring "renamed"
   :modifier-p t)
  (rename-uniquely))

;;;###autoload (autoload 'ibuffer-do-revert "ibuf-ext.el")
(define-ibuffer-op revert ()
  "Revert marked buffers as with `revert-buffer'."
  (:dangerous t
   :opstring "reverted"
   :active-opstring "revert"
   :modifier-p :maybe)
  (revert-buffer t t))

;;;###autoload (autoload 'ibuffer-do-replace-regexp "ibuf-ext.el")
(define-ibuffer-op replace-regexp (from-str to-str)
  "Perform a `replace-regexp' in marked buffers."
  (:interactive
   (let* ((from-str (read-from-minibuffer "Replace regexp: "))
          (to-str (read-from-minibuffer (concat "Replace " from-str
                                                " with: "))))
     (list from-str to-str))
   :opstring "replaced in"
   :complex t
   :modifier-p :maybe)
  (save-window-excursion
    (switch-to-buffer buf)
    (save-excursion
      (goto-char (point-min))
      (let ((case-fold-search ibuffer-case-fold-search))
        (while (re-search-forward from-str nil t)
          (replace-match to-str))))
    t))

;;;###autoload (autoload 'ibuffer-do-query-replace "ibuf-ext.el")
(define-ibuffer-op query-replace (&rest args)
  "Perform a `query-replace' in marked buffers."
  (:interactive
   (query-replace-read-args "Query replace" t t)
   :opstring "replaced in"
   :complex t
   :modifier-p :maybe)
  (save-window-excursion
    (switch-to-buffer buf)
    (save-excursion
      (let ((case-fold-search ibuffer-case-fold-search))
        (goto-char (point-min))
        (apply #'query-replace args)))
    t))

;;;###autoload (autoload 'ibuffer-do-query-replace-regexp "ibuf-ext.el")
(define-ibuffer-op query-replace-regexp (&rest args)
  "Perform a `query-replace-regexp' in marked buffers."
  (:interactive
   (query-replace-read-args "Query replace regexp" t t)
   :opstring "replaced in"
   :complex t
   :modifier-p :maybe)
  (save-window-excursion
    (switch-to-buffer buf)
    (save-excursion
      (let ((case-fold-search ibuffer-case-fold-search))
        (goto-char (point-min))
        (apply #'query-replace-regexp args)))
    t))

;;;###autoload (autoload 'ibuffer-do-print "ibuf-ext.el")
(define-ibuffer-op print ()
  "Print marked buffers as with `print-buffer'."
  (:opstring "printed"
   :modifier-p nil)
  (print-buffer))

;;;###autoload
(defun ibuffer-included-in-filters-p (buf filters)
  (not
   (memq nil ;; a filter will return nil if it failed
         (mapcar
          ;; filter should be like (TYPE . QUALIFIER), or
          ;; (or (TYPE . QUALIFIER) (TYPE . QUALIFIER) ...)
          #'(lambda (qual)
              (ibuffer-included-in-filter-p buf qual))
          filters))))

(defun ibuffer-included-in-filter-p (buf filter)
  (if (eq (car filter) 'not)
      (not (ibuffer-included-in-filter-p-1 buf (cdr filter)))
    (ibuffer-included-in-filter-p-1 buf filter)))

(defun ibuffer-included-in-filter-p-1 (buf filter)
  (not
   (not
    (case (car filter)
      (or
       (memq t (mapcar #'(lambda (x)
                           (ibuffer-included-in-filter-p buf x))
                       (cdr filter))))
      (saved
       (let ((data
              (assoc (cdr filter)
                     ibuffer-saved-filters)))
         (unless data
           (ibuffer-filter-disable)
           (error "Unknown saved filter %s" (cdr filter)))
         (ibuffer-included-in-filters-p buf (cadr data))))
      (t
       (let ((filterdat (assq (car filter)
                              ibuffer-filtering-alist)))
         ;; filterdat should be like (TYPE DESCRIPTION FUNC)
         ;; just a sanity check
        (unless filterdat
          (ibuffer-filter-disable)
          (error "Undefined filter %s" (car filter)))
        (not
         (not
          (funcall (caddr filterdat)
                   buf
                   (cdr filter))))))))))

(defun ibuffer-generate-filter-groups (bmarklist)
  (let ((filter-group-alist (append ibuffer-filter-groups
                                       (list (cons "Default" nil)))))
;;     (dolist (hidden ibuffer-hidden-filter-groups)
;;       (setq filter-group-alist (ibuffer-delete-alist
;;                                 hidden filter-group-alist)))
    (let ((vec (make-vector (length filter-group-alist) nil))
          (i 0))
      (dolist (filtergroup filter-group-alist)
        (let ((filterset (cdr filtergroup)))
          (multiple-value-bind (hip-crowd lamers)
              (ibuffer-split-list (lambda (bufmark)
                                    (ibuffer-included-in-filters-p (car bufmark)
                                                                   filterset))
                                  bmarklist)
            (aset vec i hip-crowd)
            (incf i)
            (setq bmarklist lamers))))
      (let ((ret nil))
        (dotimes (j i ret)
          (push (cons (car (nth j filter-group-alist))
                      (aref vec j))
                ret))))))

;;;###autoload
(defun ibuffer-filters-to-filter-group (name)
  "Make the current filters into a filtering group."
  (interactive "sName for filtering group: ")
  (when (null ibuffer-filtering-qualifiers)
    (error "No filters in effect"))
  (push (cons name ibuffer-filtering-qualifiers) ibuffer-filter-groups)
  (ibuffer-filter-disable))

;;;###autoload
(defun ibuffer-set-filter-groups-by-mode ()
  "Set the current filter groups to filter by mode."
  (interactive)
  (setq ibuffer-filter-groups
        (mapcar (lambda (mode)
                  (cons (format "%s" mode) `((mode . ,mode))))
                (let ((modes
                       (delete-duplicates
                        (mapcar (lambda (buf) (with-current-buffer buf major-mode))
                                (buffer-list)))))
                  (if ibuffer-view-ibuffer
                      modes
                    (delq 'ibuffer-mode modes)))))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-pop-filter-group ()
  "Remove the first filter group."
  (interactive)
  (when (null ibuffer-filter-groups)
    (error "No filter groups active"))
  (setq ibuffer-hidden-filter-groups
        (delete (pop ibuffer-filter-groups)
                ibuffer-hidden-filter-groups))
  (ibuffer-update nil t))

(defun ibuffer-read-filter-group-name (msg &optional nodefault noerror)
  (when (and (not noerror) (null ibuffer-filter-groups))
    (error "No filter groups active"))
  (let ((groups (mapcar #'car ibuffer-filter-groups)))
    (completing-read msg (if nodefault
                             groups
                           (cons "Default" groups))
                     nil t)))

;;;###autoload
(defun ibuffer-decompose-filter-group (group)
  "Decompose the filter group GROUP into active filters."
  (interactive (list (ibuffer-read-filter-group-name "Decompose filter group: " t)))
  (let ((data (cdr (assoc group ibuffer-filter-groups))))
    (setq ibuffer-filter-groups (ibuffer-delete-alist
                                 group ibuffer-filter-groups)
          ibuffer-filtering-qualifiers data))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-clear-filter-groups ()
  "Remove all filter groups."
  (interactive)
  (setq ibuffer-filter-groups nil
        ibuffer-hidden-filter-groups nil)
  (ibuffer-update nil t))

(defun ibuffer-current-filter-groups-with-position ()
  (save-excursion
    (goto-char (point-min))
    (let ((pos nil)
          (result nil))
      (while (and (not (eobp))
                  (setq pos (next-single-property-change
                             (point) 'ibuffer-filter-group-name)))
        (goto-char pos)
        (push (cons (get-text-property (point) 'ibuffer-filter-group-name)
                    pos)
              result)
        (goto-char (next-single-property-change
                    pos 'ibuffer-filter-group-name)))
      (nreverse result))))

;;;###autoload
(defun ibuffer-jump-to-filter-group (name)
  "Move point to the filter group whose name is NAME."
  (interactive (list (ibuffer-read-filter-group-name "Jump to filter group: ")))
  (ibuffer-aif (assoc name (ibuffer-current-filter-groups-with-position))
      (goto-char (cdr it))
    (error "No filter group with name %s" name)))

;;;###autoload
(defun ibuffer-kill-filter-group (name)
  "Kill the filter group named NAME.
The group will be added to `ibuffer-filter-group-kill-ring'."
  (interactive (list (ibuffer-read-filter-group-name "Kill filter group: " t)))
  (when (equal name "Default")
    (error "Can't kill default filter group"))
  (ibuffer-aif (assoc name ibuffer-filter-groups)
      (progn
        (push (copy-tree it) ibuffer-filter-group-kill-ring)
        (setq ibuffer-filter-groups (ibuffer-delete-alist
                                     name ibuffer-filter-groups))
        (setq ibuffer-hidden-filter-groups
              (delete name ibuffer-hidden-filter-groups)))
    (error "No filter group with name \"%s\"" name))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-kill-line (&optional arg)
  "Kill the filter group at point.
See also `ibuffer-kill-filter-group'."
  (interactive "P")
  (ibuffer-aif (save-excursion
                 (ibuffer-forward-line 0)
                 (get-text-property (point) 'ibuffer-filter-group-name))
      (progn
        (ibuffer-kill-filter-group it))
      (funcall (if (interactive-p) #'call-interactively #'funcall)
               #'kill-line arg)))

(defun ibuffer-insert-filter-group-before (newgroup group)
  (let ((pos (or (position group (mapcar #'car ibuffer-filter-groups)
                           :test #'equal)
                 (length ibuffer-filter-groups))))
    (cond ((<= pos 0)
           (push newgroup ibuffer-filter-groups))
          ((= pos (length ibuffer-filter-groups))
           (setq ibuffer-filter-groups (nconc ibuffer-filter-groups (list newgroup))))
          (t
           (let ((cell (nthcdr pos ibuffer-filter-groups)))
             (setf (cdr cell) (cons (car cell) (cdr cell)))
             (setf (car cell) newgroup))))))

;;;###autoload
(defun ibuffer-yank ()
  "Yank the last killed filter group before group at point."
  (interactive)
  (ibuffer-yank-filter-group
   (or (get-text-property (point) 'ibuffer-filter-group-name)
       (get-text-property (point) 'ibuffer-filter-group)
       (error "No filter group at point"))))

;;;###autoload
(defun ibuffer-yank-filter-group (name)
  "Yank the last killed filter group before group named NAME."
  (interactive (list (progn
                       (unless ibuffer-filter-group-kill-ring
                         (error "ibuffer-filter-group-kill-ring is empty"))
                       (ibuffer-read-filter-group-name
                        "Yank filter group before group: "))))
  (save-excursion
    (ibuffer-forward-line 0)
    (ibuffer-insert-filter-group-before (pop ibuffer-filter-group-kill-ring)
                                        name))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-save-filter-groups (name groups) 
  "Save all active filter groups GROUPS as NAME.
They are added to `ibuffer-saved-filter-groups'.  Interactively,
prompt for NAME, and use the current filters."
  (interactive
   (if (null ibuffer-filter-groups)
       (error "No filter groups active")
     (list
      (read-from-minibuffer "Save current filter groups as: ")
      ibuffer-filter-groups)))
  (ibuffer-aif (assoc name ibuffer-saved-filter-groups)
      (setcdr it groups)
    (push (cons name groups) ibuffer-saved-filter-groups))
  (ibuffer-maybe-save-stuff)
  (ibuffer-update-mode-name))

;;;###autoload
(defun ibuffer-delete-saved-filter-groups (name)
  "Delete saved filter groups with NAME.
They are removed from `ibuffer-saved-filter-groups'."
  (interactive
   (list
    (if (null ibuffer-saved-filter-groups)
        (error "No saved filter groups")
      (completing-read "Delete saved filter group: "
                       ibuffer-saved-filter-groups nil t))))
  (setq ibuffer-saved-filter-groups
        (ibuffer-delete-alist name ibuffer-saved-filter-groups))
  (ibuffer-maybe-save-stuff)
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-switch-to-saved-filter-groups (name)
  "Set this buffer's filter groups to saved version with NAME.
The value from `ibuffer-saved-filters' is used.
If prefix argument ADD is non-nil, then add the saved filters instead
of replacing the current filters."
  (interactive
   (list
    (if (null ibuffer-saved-filter-groups)
        (error "No saved filters")
      (completing-read "Switch to saved filter group: "
                       ibuffer-saved-filter-groups nil t))))
  (setq ibuffer-filter-groups (cdr (assoc name ibuffer-saved-filter-groups))
        ibuffer-hidden-filter-groups nil)
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-filter-disable ()
  "Disable all filters currently in effect in this buffer."
  (interactive)
  (setq ibuffer-filtering-qualifiers nil)
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-pop-filter ()
  "Remove the top filter in this buffer."
  (interactive)
  (when (null ibuffer-filtering-qualifiers)
    (error "No filters in effect"))
  (pop ibuffer-filtering-qualifiers)
  (ibuffer-update nil t))

(defun ibuffer-push-filter (qualifier)
  "Add QUALIFIER to `ibuffer-filtering-qualifiers'."
  (push qualifier ibuffer-filtering-qualifiers))

;;;###autoload
(defun ibuffer-decompose-filter ()
  "Separate the top compound filter (OR, NOT, or SAVED) in this buffer.

This means that the topmost filter on the filtering stack, which must
be a complex filter like (OR [name: foo] [mode: bar-mode]), will be
turned into two separate filters [name: foo] and [mode: bar-mode]."
  (interactive)
  (when (null ibuffer-filtering-qualifiers)
    (error "No filters in effect"))  
  (let ((lim (pop ibuffer-filtering-qualifiers)))
    (case (car lim)
      (or
       (setq ibuffer-filtering-qualifiers (append
                                          (cdr lim)
                                          ibuffer-filtering-qualifiers)))
      (saved
       (let ((data
              (assoc (cdr lim)
                     ibuffer-saved-filters)))
         (unless data
           (ibuffer-filter-disable)
           (error "Unknown saved filter %s" (cdr lim)))
         (setq ibuffer-filtering-qualifiers (append
                                            (cadr data)
                                            ibuffer-filtering-qualifiers))))
      (not
       (push (cdr lim)
             ibuffer-filtering-qualifiers))
      (t
       (error "Filter type %s is not compound" (car lim)))))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-exchange-filters ()
  "Exchange the top two filters on the stack in this buffer."
  (interactive)
  (when (< (length ibuffer-filtering-qualifiers)
           2)
    (error "Need two filters to exchange"))
  (let ((first (pop ibuffer-filtering-qualifiers))
        (second (pop ibuffer-filtering-qualifiers)))
    (push first ibuffer-filtering-qualifiers)
    (push second ibuffer-filtering-qualifiers))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-negate-filter ()
  "Negate the sense of the top filter in the current buffer."
  (interactive)
  (when (null ibuffer-filtering-qualifiers)
    (error "No filters in effect"))
  (let ((lim (pop ibuffer-filtering-qualifiers)))
    (push (if (eq (car lim) 'not)
              (cdr lim)
            (cons 'not lim))
          ibuffer-filtering-qualifiers))
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-or-filter (&optional reverse)
  "Replace the top two filters in this buffer with their logical OR.
If optional argument REVERSE is non-nil, instead break the top OR
filter into parts."
  (interactive "P")
  (if reverse
      (progn
        (when (or (null ibuffer-filtering-qualifiers)
                  (not (eq 'or (caar ibuffer-filtering-qualifiers))))
          (error "Top filter is not an OR"))
        (let ((lim (pop ibuffer-filtering-qualifiers)))
          (setq ibuffer-filtering-qualifiers (nconc (cdr lim) ibuffer-filtering-qualifiers))))
    (when (< (length ibuffer-filtering-qualifiers) 2)
      (error "Need two filters to OR"))
    ;; If the second filter is an OR, just add to it.
    (let ((first (pop ibuffer-filtering-qualifiers))
          (second (pop ibuffer-filtering-qualifiers)))
      (if (eq 'or (car second))
          (push (nconc (list 'or first) (cdr second)) ibuffer-filtering-qualifiers)
        (push (list 'or first second)
              ibuffer-filtering-qualifiers))))
  (ibuffer-update nil t))

(defun ibuffer-maybe-save-stuff ()
  (when ibuffer-save-with-custom
    (if (fboundp 'customize-save-variable)
        (progn
          (customize-save-variable 'ibuffer-saved-filters
                                   ibuffer-saved-filters)
          (customize-save-variable 'ibuffer-saved-filter-groups
                                   ibuffer-saved-filter-groups))
      (message "Not saved permanently: Customize not available"))))

;;;###autoload
(defun ibuffer-save-filters (name filters)
  "Save FILTERS in this buffer with name NAME in `ibuffer-saved-filters'.
Interactively, prompt for NAME, and use the current filters."
  (interactive
   (if (null ibuffer-filtering-qualifiers)
       (error "No filters currently in effect")
     (list
      (read-from-minibuffer "Save current filters as: ")
      ibuffer-filtering-qualifiers)))
  (ibuffer-aif (assoc name ibuffer-saved-filters)
      (setcdr it filters)
    (push (list name filters) ibuffer-saved-filters))
  (ibuffer-maybe-save-stuff)
  (ibuffer-update-mode-name))

;;;###autoload
(defun ibuffer-delete-saved-filters (name)
  "Delete saved filters with NAME from `ibuffer-saved-filters'."
  (interactive
   (list
    (if (null ibuffer-saved-filters)
        (error "No saved filters")
      (completing-read "Delete saved filters: "
                       ibuffer-saved-filters nil t))))
  (setq ibuffer-saved-filters
        (ibuffer-delete-alist name ibuffer-saved-filters))
  (ibuffer-maybe-save-stuff)
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-add-saved-filters (name)
  "Add saved filters from `ibuffer-saved-filters' to this buffer's filters."
  (interactive
   (list
    (if (null ibuffer-saved-filters)
        (error "No saved filters")
      (completing-read "Add saved filters: "
                       ibuffer-saved-filters nil t))))
  (push (cons 'saved name) ibuffer-filtering-qualifiers)
  (ibuffer-update nil t))

;;;###autoload
(defun ibuffer-switch-to-saved-filters (name)
  "Set this buffer's filters to filters with NAME from `ibuffer-saved-filters'.
If prefix argument ADD is non-nil, then add the saved filters instead
of replacing the current filters."
  (interactive
   (list
    (if (null ibuffer-saved-filters)
        (error "No saved filters")
      (completing-read "Switch to saved filters: "
                       ibuffer-saved-filters nil t))))
  (setq ibuffer-filtering-qualifiers (list (cons 'saved name)))
  (ibuffer-update nil t))

(defun ibuffer-format-filter-group-data (filter)
  (if (equal filter "Default")
      ""
    (concat "Filter: " (mapconcat #'ibuffer-format-qualifier
                                  (cdr (assq filter ibuffer-filter-groups))
                                  " ") "\n")))
  
(defun ibuffer-format-qualifier (qualifier)
  (if (eq (car-safe qualifier) 'not)
      (concat " [NOT" (ibuffer-format-qualifier-1 (cdr qualifier)) "]")
    (ibuffer-format-qualifier-1 qualifier)))

(defun ibuffer-format-qualifier-1 (qualifier)
  (case (car qualifier)
    (saved
     (concat " [filter: " (cdr qualifier) "]"))
    (or
     (concat " [OR" (mapconcat #'ibuffer-format-qualifier
                               (cdr qualifier) "") "]"))
    (t
     (let ((type (assq (car qualifier) ibuffer-filtering-alist)))
       (unless qualifier
         (error "Ibuffer: bad qualifier %s" qualifier))
       (concat " [" (cadr type) ": " (format "%s]" (cdr qualifier)))))))
  

(defun ibuffer-list-buffer-modes ()
  "Create an alist of buffer modes currently in use.
The list returned will be of the form (\"MODE-NAME\" . MODE-SYMBOL)."
  (let ((bufs (buffer-list))
        (modes)
        (this-mode))
    (while bufs
      (setq this-mode 
            (with-current-buffer 
                (car bufs)
              major-mode)
            bufs (cdr bufs))
      (add-to-list 
       'modes
       `(,(symbol-name this-mode) . 
         ,this-mode)))
    modes)) 


;;; Extra operation definitions

;;;###autoload (autoload 'ibuffer-filter-by-mode "ibuf-ext.el")
(define-ibuffer-filter mode 
  "Toggle current view to buffers with major mode QUALIFIER."
  (:description "major mode"
   :reader
   (intern
    (completing-read "Filter by major mode: " obarray
                     #'(lambda (e)
                         (string-match "-mode$"
                                       (symbol-name e)))
                     t
                     (let ((buf (ibuffer-current-buffer)))
                       (if (and buf (buffer-live-p buf))
                           (with-current-buffer buf
                             (symbol-name major-mode))
                         "")))))
  (eq qualifier (with-current-buffer buf major-mode)))

;;;###autoload (autoload 'ibuffer-filter-by-used-mode "ibuf-ext.el")
(define-ibuffer-filter used-mode 
  "Toggle current view to buffers with major mode QUALIFIER.
Called interactively, this function allows selection of modes
currently used by buffers."
  (:description "major mode in use"
                :reader
                (intern 
                 (completing-read "Filter by major mode: " 
                                  (ibuffer-list-buffer-modes)
                                  nil
                                  t
                                  (let ((buf (ibuffer-current-buffer)))
                                    (if (and buf (buffer-live-p buf))
                                        (with-current-buffer buf
                                          (symbol-name major-mode))
                                      "")))))
  (eq qualifier (with-current-buffer buf major-mode)))

;;;###autoload (autoload 'ibuffer-filter-by-name "ibuf-ext.el")
(define-ibuffer-filter name 
  "Toggle current view to buffers with name matching QUALIFIER."
  (:description "buffer name"
   :reader (read-from-minibuffer "Filter by name (regexp): "))
  (string-match qualifier (buffer-name buf)))

;;;###autoload (autoload 'ibuffer-filter-by-filename "ibuf-ext.el")
(define-ibuffer-filter filename
  "Toggle current view to buffers with filename matching QUALIFIER."
  (:description "filename"
   :reader (read-from-minibuffer "Filter by filename (regexp): "))
  (ibuffer-awhen (buffer-file-name buf)
    (string-match qualifier it)))

;;;###autoload (autoload 'ibuffer-filter-by-size-gt  "ibuf-ext.el")
(define-ibuffer-filter size-gt 
  "Toggle current view to buffers with size greater than QUALIFIER."
  (:description "size greater than"
   :reader
   (string-to-number (read-from-minibuffer "Filter by size greater than: ")))
  (> (with-current-buffer buf (buffer-size))
     qualifier))

;;;###autoload (autoload 'ibuffer-filter-by-size-lt  "ibuf-ext.el")
(define-ibuffer-filter size-lt 
   "Toggle current view to buffers with size less than QUALIFIER."
  (:description "size less than"
   :reader
   (string-to-number (read-from-minibuffer "Filter by size less than: ")))
  (< (with-current-buffer buf (buffer-size))
     qualifier))

;;;###autoload (autoload 'ibuffer-filter-by-content "ibuf-ext.el")
(define-ibuffer-filter content
   "Toggle current view to buffers whose contents match QUALIFIER."
  (:description "content"
   :reader (read-from-minibuffer "Filter by content (regexp): "))
  (with-current-buffer buf
    (save-excursion
      (goto-char (point-min))
      (re-search-forward qualifier nil t))))

;;;###autoload (autoload 'ibuffer-filter-by-predicate "ibuf-ext.el")
(define-ibuffer-filter predicate
   "Toggle current view to buffers for which QUALIFIER returns non-nil."
  (:description "predicate"
   :reader (read-minibuffer "Filter by predicate (form): "))
  (with-current-buffer buf
    (eval qualifier)))

;;; Sorting

;;;###autoload
(defun ibuffer-toggle-sorting-mode ()
  "Toggle the current sorting mode.
Default sorting modes are:
 Recency - the last time the buffer was viewed
 Name - the name of the buffer
 Major Mode - the name of the major mode of the buffer
 Size - the size of the buffer"
  (interactive)
  (let ((modes (mapcar 'car ibuffer-sorting-functions-alist)))
    (add-to-list 'modes 'recency)
    (setq modes (sort modes 'string-lessp))
    (let ((next (or (car-safe (cdr-safe (memq ibuffer-sorting-mode modes)))
                    (car modes))))
      (setq ibuffer-sorting-mode next)
      (message "Sorting by %s" next)))
  (ibuffer-redisplay t))

;;;###autoload
(defun ibuffer-invert-sorting ()
  "Toggle whether or not sorting is in reverse order."
  (interactive)
  (setq ibuffer-sorting-reversep (not ibuffer-sorting-reversep))
  (message "Sorting order %s"
           (if ibuffer-sorting-reversep
               "reversed"
             "normal"))
  (ibuffer-redisplay t))

;;;###autoload (autoload 'ibuffer-do-sort-by-major-mode "ibuf-ext.el")
(define-ibuffer-sorter major-mode
  "Sort the buffers by major modes.
Ordering is lexicographic."
  (:description "major mode")
  (string-lessp (downcase
                 (symbol-name (with-current-buffer
                                  (car a)
                                major-mode)))
                (downcase
                 (symbol-name (with-current-buffer
                                  (car b)
                                major-mode)))))

;;;###autoload (autoload 'ibuffer-do-sort-by-mode-name "ibuf-ext.el")
(define-ibuffer-sorter mode-name
  "Sort the buffers by their mode name.
Ordering is lexicographic."
  (:description "major mode name")
  (string-lessp (downcase
                  (with-current-buffer
                      (car a)
                    mode-name))
                (downcase
                 (with-current-buffer
                     (car b)
                   mode-name))))

;;;###autoload (autoload 'ibuffer-do-sort-by-alphabetic "ibuf-ext.el")
(define-ibuffer-sorter alphabetic
  "Sort the buffers by their names.
Ordering is lexicographic."
  (:description "buffer name")
  (string-lessp
   (buffer-name (car a))
   (buffer-name (car b))))

;;;###autoload (autoload 'ibuffer-do-sort-by-size "ibuf-ext.el")
(define-ibuffer-sorter size
 "Sort the buffers by their size."
  (:description "size")
  (< (with-current-buffer (car a)
       (buffer-size))
     (with-current-buffer (car b)
       (buffer-size))))

;;; Functions to emulate bs.el

;;;###autoload
(defun ibuffer-bs-show ()
  "Emulate `bs-show' from the bs.el package."
  (interactive)
  (ibuffer t "*Ibuffer-bs*" '((filename . ".*")) nil t)
  (define-key (current-local-map) "a" 'ibuffer-bs-toggle-all))

(defun ibuffer-bs-toggle-all ()
  "Emulate `bs-toggle-show-all' from the bs.el package."
  (interactive)
  (if ibuffer-filtering-qualifiers
      (ibuffer-pop-filter)
    (progn (ibuffer-push-filter '(filename . ".*"))
           (ibuffer-update nil t))))

;;; Handy functions

;;;###autoload
(defun ibuffer-add-to-tmp-hide (regexp)
  "Add REGEXP to `ibuffer-tmp-hide-regexps'.
This means that buffers whose name matches REGEXP will not be shown
for this ibuffer session."
  (interactive
   (list
    (read-from-minibuffer "Never show buffers matching: "
                          (regexp-quote (buffer-name (ibuffer-current-buffer t))))))
  (push regexp ibuffer-tmp-hide-regexps))

;;;###autoload
(defun ibuffer-add-to-tmp-show (regexp)
  "Add REGEXP to `ibuffer-tmp-show-regexps'.
This means that buffers whose name matches REGEXP will always be shown
for this ibuffer session."
  (interactive
   (list
    (read-from-minibuffer "Always show buffers matching: "
                          (regexp-quote (buffer-name (ibuffer-current-buffer t))))))
  (push regexp ibuffer-tmp-show-regexps))

;;;###autoload
(defun ibuffer-forward-next-marked (&optional count mark direction)
  "Move forward by COUNT marked buffers (default 1).

If MARK is non-nil, it should be a character denoting the type of mark
to move by.  The default is `ibuffer-marked-char'.

If DIRECTION is non-nil, it should be an integer; negative integers
mean move backwards, non-negative integers mean move forwards."
  (interactive "P")
  (unless count
    (setq count 1))
  (unless mark
    (setq mark ibuffer-marked-char))
  (unless direction
    (setq direction 1))
  ;; Skip the title
  (ibuffer-forward-line 0)
  (let ((opos (point))
        curmark)
    (ibuffer-forward-line direction)
    (while (not (or (= (point) opos)
                    (eq (setq curmark (ibuffer-current-mark))
                        mark)))
      (ibuffer-forward-line direction))
    (when (and (= (point) opos)
               (not (eq (ibuffer-current-mark) mark)))
      (error "No buffers with mark %c" mark))))

;;;###autoload
(defun ibuffer-backwards-next-marked (&optional count mark)
   "Move backwards by COUNT marked buffers (default 1).

If MARK is non-nil, it should be a character denoting the type of mark
to move by.  The default is `ibuffer-marked-char'."
   (interactive "P")
   (ibuffer-forward-next-marked count mark -1))

;;;###autoload
(defun ibuffer-do-kill-lines ()
  "Hide all of the currently marked lines."
  (interactive)
  (if (= (ibuffer-count-marked-lines) 0)
      (message "No buffers marked; use 'm' to mark a buffer")
    (let ((count
           (ibuffer-map-marked-lines
            #'(lambda (buf mark)
                'kill))))
      (message "Killed %s lines" count))))

;;;###autoload
(defun ibuffer-jump-to-buffer (name)
  "Move point to the buffer whose name is NAME."
  (interactive (list nil))
  (let ((table (mapcar #'(lambda (x)
                           (cons (buffer-name (car x))
                                 (caddr x)))
                       (ibuffer-current-state-list t))))
    (when (null table)
      (error "No buffers!"))
    (when (interactive-p)
      (setq name (completing-read "Jump to buffer: " table nil t)))
    (ibuffer-aif (assoc name table)
        (goto-char (cdr it))
      (error "No buffer with name %s" name))))

;;;###autoload
(defun ibuffer-diff-with-file ()
  "View the differences between this buffer and its associated file.
This requires the external program \"diff\" to be in your `exec-path'."
  (interactive)
  (let ((buf (ibuffer-current-buffer)))
    (unless (buffer-live-p buf)
      (error "Buffer %s has been killed" buf))
    (diff-buffer-with-file buf)))

;;;###autoload
(defun ibuffer-copy-filename-as-kill (&optional arg)
  "Copy filenames of marked buffers into the kill ring.
The names are separated by a space.
If a buffer has no filename, it is ignored.
With a zero prefix arg, use the complete pathname of each marked file.

You can then feed the file name(s) to other commands with C-y.

 [ This docstring shamelessly stolen from the
 `dired-copy-filename-as-kill' in \"dired-x\". ]"
  ;; Add to docstring later:
  ;; With C-u, use the relative pathname of each marked file.
  (interactive "P")
  (if (= (ibuffer-count-marked-lines) 0)
      (message "No buffers marked; use 'm' to mark a buffer")
    (let ((ibuffer-copy-filename-as-kill-result "")
          (type (cond ((eql arg 0)
                       'full)
                      ;; ((eql arg 4)
                      ;;  'relative)
                      (t
                       'name))))
      (ibuffer-map-marked-lines
       #'(lambda (buf mark)
           (setq ibuffer-copy-filename-as-kill-result
                 (concat ibuffer-copy-filename-as-kill-result
                         (let ((name (buffer-file-name buf)))
                           (if name
                               (case type
                                 (full
                                  name)
                                 (t
                                  (file-name-nondirectory name)))
                             ""))
                         " "))))
      (push ibuffer-copy-filename-as-kill-result kill-ring))))

(defun ibuffer-mark-on-buffer (func &optional ibuffer-mark-on-buffer-mark group)
  (let ((count
         (ibuffer-map-lines
          #'(lambda (buf mark)
              (when (funcall func buf)
                (ibuffer-set-mark-1 (or ibuffer-mark-on-buffer-mark
                                        ibuffer-marked-char))
                t))
          nil
          group)))
    (ibuffer-redisplay t)
    (message "Marked %s buffers" count)))

;;;###autoload
(defun ibuffer-mark-by-name-regexp (regexp)
  "Mark all buffers whose name matches REGEXP."
  (interactive "sMark by name (regexp): ")
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (string-match regexp (buffer-name buf)))))

;;;###autoload
(defun ibuffer-mark-by-mode-regexp (regexp)
  "Mark all buffers whose major mode matches REGEXP."
  (interactive "sMark by major mode (regexp): ")
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (with-current-buffer buf
         (string-match regexp mode-name)))))

;;;###autoload
(defun ibuffer-mark-by-file-name-regexp (regexp)
  "Mark all buffers whose file name matches REGEXP."
  (interactive "sMark by file name (regexp): ")
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (let ((name (or (buffer-file-name buf)
                       (with-current-buffer buf
                         (and
                          (boundp 'dired-directory)
                          (stringp dired-directory)
                          dired-directory)))))
         (when name
           (string-match regexp name))))))

;;;###autoload
(defun ibuffer-mark-by-mode (mode)
  "Mark all buffers whose major mode equals MODE."
  (interactive
   (list (intern (completing-read "Mark by major mode: " obarray
                                  #'(lambda (e)
                                      ;; kind of a hack...
                                      (and (fboundp e)
                                           (string-match "-mode$"
                                                         (symbol-name e))))
                                  t
                                  (let ((buf (ibuffer-current-buffer)))
                                    (if (and buf (buffer-live-p buf))
                                        (with-current-buffer buf
                                          (cons (symbol-name major-mode)
                                                0))
                                      ""))))))
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (with-current-buffer buf
         (eq major-mode mode)))))

;;;###autoload
(defun ibuffer-mark-modified-buffers ()
  "Mark all modified buffers."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf) (buffer-modified-p buf))))

;;;###autoload
(defun ibuffer-mark-unsaved-buffers ()
  "Mark all modified buffers that have an associated file."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf) (and (with-current-buffer buf buffer-file-name)
                        (buffer-modified-p buf)))))

;;;###autoload
(defun ibuffer-mark-dissociated-buffers ()
  "Mark all buffers whose associated file does not exist."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (with-current-buffer buf
         (or
          (and buffer-file-name
               (not (file-exists-p buffer-file-name)))
          (and (eq major-mode 'dired-mode)
               (boundp 'dired-directory)
               (stringp dired-directory)
               (not (file-exists-p (file-name-directory dired-directory)))))))))

;;;###autoload
(defun ibuffer-mark-help-buffers ()
  "Mark buffers like *Help*, *Apropos*, *Info*."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (with-current-buffer buf
         (memq major-mode ibuffer-help-buffer-modes)))))

;;;###autoload
(defun ibuffer-mark-old-buffers ()
  "Mark buffers which have not been viewed in `ibuffer-old-time' days."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (with-current-buffer buf
         ;; hacked from midnight.el
         (when buffer-display-time
           (let* ((tm (current-time))
                  (now (+ (* (float (ash 1 16)) (car tm))
                          (float (cadr tm)) (* 0.0000001 (caddr tm))))
                  (then (+ (* (float (ash 1 16))
                              (car buffer-display-time))
                           (float (cadr buffer-display-time))
                           (* 0.0000001 (caddr buffer-display-time)))))
             (> (- now then) (* 60 60 ibuffer-old-time))))))))

;;;###autoload
(defun ibuffer-mark-special-buffers ()
  "Mark all buffers whose name begins and ends with '*'."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf) (string-match "^\\*.+\\*$"
                                 (buffer-name buf)))))

;;;###autoload
(defun ibuffer-mark-read-only-buffers ()
  "Mark all read-only buffers."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (with-current-buffer buf
         buffer-read-only))))

;;;###autoload
(defun ibuffer-mark-dired-buffers ()
  "Mark all `dired' buffers."
  (interactive)
  (ibuffer-mark-on-buffer
   #'(lambda (buf)
       (with-current-buffer buf
         (eq major-mode 'dired-mode)))))

;;;###autoload
(defun ibuffer-do-occur (regexp &optional nlines)
  "View lines which match REGEXP in all marked buffers.
Optional argument NLINES says how many lines of context to display: it
defaults to one."
  (interactive (occur-read-primary-args))
  (if (or (not (integerp nlines))
          (< nlines 0))
      (setq nlines 0))
  (when (zerop (ibuffer-count-marked-lines))
    (ibuffer-set-mark ibuffer-marked-char))
  (let ((ibuffer-do-occur-bufs nil))
    ;; Accumulate a list of marked buffers
    (ibuffer-map-marked-lines
     #'(lambda (buf mark)
         (push buf ibuffer-do-occur-bufs)))
    (occur-1 regexp nlines ibuffer-do-occur-bufs)))

(provide 'ibuf-ext)

;;; ibuf-ext.el ends here