Copy buffer names to kill ring

* ibuf-ext.el (ibuffer-copy-buffername-as-kill): New command.
* lisp/ibuffer (ibuffer-mode-map): Bound it to 'B'.
;* etc/NEWS: Add entry for this new feature.

etc/NEWS

@@ -198,6 +198,10 @@ same as in modes where the character is not whitespace.
 
 ** Ibuffer
 
+---
+*** A new command 'ibuffer-copy-buffername-as-kill'; bound
+to 'B'.
+
 ---
 *** New command 'ibuffer-change-marks'; bound to '* c'.
 

lisp/ibuf-ext.el

@@ -1462,6 +1462,23 @@ You can then feed the file name(s) to other commands with \\[yank]."
       (kill-new result)
       (message "%s" result))))
 
+;;;###autoload
+(defun ibuffer-copy-buffername-as-kill ()
+  "Copy buffer names of marked buffers into the kill ring.
+The names are separated by a space.
+You can then feed the file name(s) to other commands with \\[yank]."
+  (interactive)
+  (if (zerop (ibuffer-count-marked-lines))
+      (message "No buffers marked; use 'm' to mark a buffer")
+    (let ((res ""))
+      (ibuffer-map-marked-lines
+       #'(lambda (buf _mark)
+           (setq res (concat res (buffer-name buf) " "))))
+      (when (not (zerop (length res)))
+        (setq res (substring res 0 -1)))
+      (kill-new res)
+      (message res))))
+
 (defun ibuffer-mark-on-buffer (func &optional ibuffer-mark-on-buffer-mark group)
   (let ((count
 	 (ibuffer-map-lines

lisp/ibuffer.el

@@ -586,6 +586,7 @@ directory, like `default-directory'."
 
     (define-key map (kbd "k") 'ibuffer-do-kill-lines)
     (define-key map (kbd "w") 'ibuffer-copy-filename-as-kill)
+    (define-key map (kbd "B") 'ibuffer-copy-buffername-as-kill)
 
     (define-key map (kbd "RET") 'ibuffer-visit-buffer)
     (define-key map (kbd "e") 'ibuffer-visit-buffer)