* lisp/ibuf-ext.el (ibuffer-list-buffer-modes): Add `include-parents' arg.

(ibuffer-filter-by-derived-mode): New filter.
* lisp/ibuffer.el (ibuffer-mode-map): Bind to `/ w'.

etc/NEWS

@@ -74,6 +74,8 @@ character when doing minibuffer filename prompts.
 
 * Changes in Specialized Modes and Packages in Emacs 24.2
 
+** New `derived-mode' filter for Ibuffer, bound to `/ w'.
+
 ** Apropos
 
 *** The faces used by Apropos are now directly customizable.

lisp/ChangeLog

+2012-04-24  Ivan Andrus  <darthandrus@gmail.com>  (tiny change)
+
+	* ibuf-ext.el (ibuffer-list-buffer-modes): Add `include-parents' arg.
+	(ibuffer-filter-by-derived-mode): New filter.
+	* ibuffer.el (ibuffer-mode-map): Bind to `/ w'.
+
 2012-04-23  Andreas Politz  <politza@fh-trier.de>
 
 	* subr.el (accept-change-group): Fix arg usage (Bug#6095).

lisp/ibuf-ext.el

@@ -973,8 +973,9 @@ Interactively, prompt for NAME, and use the current filters."
        (concat " [" (cadr type) ": " (format "%s]" (cdr qualifier)))))))
 
 
-(defun ibuffer-list-buffer-modes ()
+(defun ibuffer-list-buffer-modes (&optional include-parents)
   "Create an alist of buffer modes currently in use.
+If INCLUDE-PARENTS is non-nil then include parent modes.
 The list returned will be of the form (\"MODE-NAME\" . MODE-SYMBOL)."
   (let ((bufs (buffer-list))
 	(modes)
@@ -982,10 +983,13 @@ The list returned will be of the form (\"MODE-NAME\" . MODE-SYMBOL)."
     (while bufs
       (setq this-mode (buffer-local-value 'major-mode (car bufs))
 	    bufs (cdr bufs))
-      (add-to-list
-       'modes
-       `(,(symbol-name this-mode) .
-	 ,this-mode)))
+      (while this-mode
+	(add-to-list
+	 'modes
+	 `(,(symbol-name this-mode) .
+	   ,this-mode))
+	(setq this-mode (and include-parents
+			     (get this-mode 'derived-mode-parent)))))
     modes))
 
 
@@ -1027,6 +1031,16 @@ currently used by buffers."
 				      "")))))
   (eq qualifier (buffer-local-value 'major-mode buf)))
 
+(define-ibuffer-filter derived-mode
+    "Toggle current view to buffers whose major mode inherits from QUALIFIER."
+  (:description "derived mode"
+		:reader
+		(intern
+		 (completing-read "Filter by derived mode: "
+				  (ibuffer-list-buffer-modes t)
+				  nil nil "")))
+  (with-current-buffer buf (derived-mode-p qualifier)))
+
 ;;;###autoload (autoload 'ibuffer-filter-by-name "ibuf-ext")
 (define-ibuffer-filter name
   "Toggle current view to buffers with name matching QUALIFIER."

lisp/ibuffer.el

@@ -503,6 +503,7 @@ directory, like `default-directory'."
 
     (define-key map (kbd "/ m") 'ibuffer-filter-by-mode)
     (define-key map (kbd "/ M") 'ibuffer-filter-by-used-mode)
+    (define-key map (kbd "/ w") 'ibuffer-filter-by-derived-mode)
     (define-key map (kbd "/ n") 'ibuffer-filter-by-name)
     (define-key map (kbd "/ c") 'ibuffer-filter-by-content)
     (define-key map (kbd "/ e") 'ibuffer-filter-by-predicate)
@@ -2645,7 +2646,7 @@ will be inserted before the group at point."
 ;;;;;;  ibuffer-backward-filter-group ibuffer-forward-filter-group
 ;;;;;;  ibuffer-toggle-filter-group ibuffer-mouse-toggle-filter-group
 ;;;;;;  ibuffer-interactive-filter-by-mode ibuffer-mouse-filter-by-mode
-;;;;;;  ibuffer-auto-mode) "ibuf-ext" "ibuf-ext.el" "1400db1bc3d4a3010cbc4807a6725072")
+;;;;;;  ibuffer-auto-mode) "ibuf-ext" "ibuf-ext.el" "b2b8f11ad22546ad05d6db0b7d388ac1")
 ;;; Generated autoloads from ibuf-ext.el
 
 (autoload 'ibuffer-auto-mode "ibuf-ext" "\