* textmodes/flyspell.el (flyspell-check-region-doublons): New

	function to detect duplicated words.
	(flyspell-large-region): Use it.

1 files changed, 18 insertions, 1 deletions

diff --git a/lisp/textmodes/flyspell.el b/lisp/textmodes/flyspell.el
index 34b6297a800..ebee4691e8c 100644
--- a/lisp/textmodes/flyspell.el
+++ b/lisp/textmodes/flyspell.el
@@ -1460,6 +1460,22 @@ The buffer to mark them in is `flyspell-large-region-buffer'."
             (while (re-search-forward regexp nil t)
               (delete-region (match-beginning 0) (match-end 0)))))))))
 
+;;* ---------------------------------------------------------------
+;;*     flyspell-check-region-doublons
+;;* ---------------------------------------------------------------
+(defun flyspell-check-region-doublons (beg end)
+  "Check for adjacent duplicated words (doublons) in the given region."
+  (save-excursion
+    (goto-char beg)
+    (flyspell-word)     ; Make sure current word is checked
+    (backward-word 1)
+    (while (and (< (point) end)
+                (re-search-forward "\\b\\([^ \n\t]+\\)[ \n\t]+\\1\\b"
+                                   end 'move))
+      (flyspell-word)
+      (backward-word 1))
+    (flyspell-word)))
+
 ;;*---------------------------------------------------------------------*/
 ;;*    flyspell-large-region ...                                        */
 ;;*---------------------------------------------------------------------*/
@@ -1504,7 +1520,8 @@ The buffer to mark them in is `flyspell-large-region-buffer'."
           (progn
             (flyspell-process-localwords buffer)
             (with-current-buffer curbuf
-              (flyspell-delete-region-overlays beg end))
+              (flyspell-delete-region-overlays beg end)
+              (flyspell-check-region-doublons beg end))
             (flyspell-external-point-words))
         (error "Can't check region...")))))