Add a new command `info-display-manual'.

lisp/info.el (info-display-manual): New function.

etc/NEWS

@@ -676,6 +676,14 @@ binding `log-view-expanded-log-entry-function' to a suitable function.
 
 *** New command `nato-region' converts text to NATO phonetic alphabet.
 
+*** The new command `info-display-manual' will display an Info manual
+specified by its name.  If that manual is already visited in some Info
+buffer within the current session, the command will display that
+buffer.  Otherwise, it will load the manual and display it.  This is
+handy if you have many manuals in many Info buffers, and don't
+remember the name of the buffer visiting the manual you want to
+consult.
+
 
 * New Modes and Packages in Emacs 24.1
 

lisp/ChangeLog

@@ -1,3 +1,7 @@
+2011-04-01  Eli Zaretskii  <eliz@gnu.org>
+
+	* info.el (info-display-manual): New function.
+
 2011-03-31  Stefan Monnier  <monnier@iro.umontreal.ca>
 
 	* loadup.el: Load minibuffer after loaddefs, to use define-minor-mode.

lisp/info.el

@@ -4930,6 +4930,27 @@ type returned by `Info-bookmark-make-record', which see."
     (bookmark-default-handler
      `("" (buffer . ,buf) . ,(bookmark-get-bookmark-record bmk)))))
 
+
+;;;###autoload
+(defun info-display-manual (manual)
+  "Go to Info buffer that displays MANUAL, creating it if none already exists."
+  (interactive "sManual name: ")
+  (let ((blist (buffer-list))
+	(manual-re (concat "\\(/\\|\\`\\)" manual "\\(\\.\\|\\'\\)"))
+	(case-fold-search t)
+	found)
+    (dolist (buffer blist)
+      (with-current-buffer buffer
+	(when (and (eq major-mode 'Info-mode)
+		   (stringp Info-current-file)
+		   (string-match manual-re Info-current-file))
+	  (setq found buffer
+		blist nil))))
+    (if found
+	(pop-to-buffer found)
+      (info-initialize)
+      (info (Info-find-file manual)))))
+
 (provide 'info)
 
 ;;; info.el ends here