Merge commit 2014-07-28T09:07:56Z!tsdh@gnu.org from trunk.

lisp/ChangeLog

+2014-07-28  Stephen Berman  <stephen.berman@gmx.net>
+
+	* doc-view.el (doc-view-open-text): Don't require that the
+	document is saved in a file (e.g., email attachment).
+
 2014-07-27  Eli Zaretskii  <eliz@gnu.org>
 
 	* window.el (window--pixel-to-total): Use FRAME's root window, not

lisp/doc-view.el

@@ -1402,11 +1402,12 @@ For now these keys are useful:
   (interactive)
   (if doc-view--current-converter-processes
       (message "DocView: please wait till conversion finished.")
-    (let ((txt (expand-file-name "doc.txt" (doc-view--current-cache-dir))))
+    (let ((txt (expand-file-name "doc.txt" (doc-view--current-cache-dir)))
+	  (bname (or buffer-file-name (buffer-name))))
       (if (file-readable-p txt)
 	  (let ((name (concat "Text contents of "
-			      (file-name-nondirectory buffer-file-name)))
-		(dir (file-name-directory buffer-file-name)))
+			      (file-name-nondirectory bname)))
+		(dir (or (file-name-directory bname) default-directory)))
 	    (with-current-buffer (find-file txt)
 	      (rename-buffer name)
 	      (setq default-directory dir)))