2002-01-05  TSUCHIYA Masatoshi  <tsuchiya@namazu.org>
 
+       * lisp/nnshimbun.el (nnshimbun-request-article): Handle the
+       article properly when no group is specified.
+       (nnshimbun-write-nov, nnshimbun-save-nov): Save nov databases only
+       when their sizes are greater than zero.
+
        * lisp/gnus-namazu.el (gnus-namazu-query-highlight): New option.
        (gnus-namazu-query-highlight-face): New face.
        (gnus-namazu/check-cache-group): New function.
 
 (deffoo nnshimbun-request-article (article &optional group server to-buffer)
   (when (nnshimbun-possibly-change-group group server)
     (when (stringp article)
-      (setq article (nnshimbun-search-id group article)))
+      (let ((num (when (or group (setq group nnshimbun-current-group))
+                  (nnshimbun-search-id group article))))
+       (unless num
+         (let ((groups (shimbun-groups (shimbun-open server))))
+           (while (and (not num) groups)
+             (setq group (pop groups)
+                   num (nnshimbun-search-id group article)))))
+       (setq article num)))
     (if (integerp article)
        (nnshimbun-request-article-1 article group server to-buffer)
       (nnheader-report 'nnshimbun "Couldn't retrieve article: %s"
     (when (buffer-live-p buffer)
       (save-excursion
        (set-buffer buffer)
-       (buffer-modified-p)
-       (nnmail-write-region 1 (point-max) nnshimbun-nov-buffer-file-name
-                            nil 'nomesg)))))
+       (and (> (buffer-size) 0)
+            (buffer-modified-p)
+            (nnmail-write-region 1 (point-max) nnshimbun-nov-buffer-file-name
+                                 nil 'nomesg))))))
 
 (defun nnshimbun-save-nov ()
   (save-excursion
     (while nnshimbun-nov-buffer-alist
       (when (buffer-name (cdar nnshimbun-nov-buffer-alist))
        (set-buffer (cdar nnshimbun-nov-buffer-alist))
-       (when (buffer-modified-p)
-         (nnmail-write-region 1 (point-max) nnshimbun-nov-buffer-file-name
-                              nil 'nomesg))
-       (set-buffer-modified-p nil)
+       (and (> (buffer-size) 0)
+            (buffer-modified-p)
+            (nnmail-write-region 1 (point-max) nnshimbun-nov-buffer-file-name
+                                 nil 'nomesg))
        (kill-buffer (current-buffer)))
       (setq nnshimbun-nov-buffer-alist (cdr nnshimbun-nov-buffer-alist)))))