2 files changed, 23 insertions, 0 deletions

diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index 4b0d0cac233..ceeb42b9182 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -10197,6 +10197,11 @@ Sort by lines (@code{gnus-summary-sort-by-lines}).
 @findex gnus-summary-sort-by-chars
 Sort by article length (@code{gnus-summary-sort-by-chars}).
 
+@item C-c C-s C-m C-m
+@kindex C-c C-s C-m C-m (Summary)
+@findex gnus-summary-sort-by-marks
+Sort by article ``readedness'' marks (@code{gnus-summary-sort-by-marks}).
+
 @item C-c C-s C-i
 @kindex C-c C-s C-i (Summary)
 @findex gnus-summary-sort-by-score
diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 4390a2c07d6..2631514e425 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -1895,6 +1895,7 @@ increase the score of each group you read."
   "\C-c\C-s\C-m\C-n" gnus-summary-sort-by-most-recent-number
   "\C-c\C-s\C-l" gnus-summary-sort-by-lines
   "\C-c\C-s\C-c" gnus-summary-sort-by-chars
+  "\C-c\C-s\C-m\C-m" gnus-summary-sort-by-marks
   "\C-c\C-s\C-a" gnus-summary-sort-by-author
   "\C-c\C-s\C-t" gnus-summary-sort-by-recipient
   "\C-c\C-s\C-s" gnus-summary-sort-by-subject
@@ -2748,6 +2749,7 @@ gnus-summary-show-article-from-menu-as-charset-%s" cs))))
          ["Sort by score" gnus-summary-sort-by-score t]
          ["Sort by lines" gnus-summary-sort-by-lines t]
          ["Sort by characters" gnus-summary-sort-by-chars t]
+         ["Sort by marks" gnus-summary-sort-by-marks t]
          ["Randomize" gnus-summary-sort-by-random t]
          ["Original sort" gnus-summary-sort-by-original t])
         ("Help"
@@ -4946,6 +4948,16 @@ using some other form will lead to serious barfage."
   (gnus-article-sort-by-chars
    (gnus-thread-header h1) (gnus-thread-header h2)))
 
+(defsubst gnus-article-sort-by-marks (h1 h2)
+  "Sort articles by octet length."
+  (< (gnus-article-mark (mail-header-number h1))
+     (gnus-article-mark (mail-header-number h2))))
+
+(defun gnus-thread-sort-by-marks (h1 h2)
+  "Sort threads by root article octet length."
+  (gnus-article-sort-by-marks
+   (gnus-thread-header h1) (gnus-thread-header h2)))
+
 (defsubst gnus-article-sort-by-author (h1 h2)
   "Sort articles by root author."
   (gnus-string<
@@ -11930,6 +11942,12 @@ Argument REVERSE means reverse order."
   (interactive "P")
   (gnus-summary-sort 'chars reverse))
 
+(defun gnus-summary-sort-by-mark (&optional reverse)
+  "Sort the summary buffer by article marks.
+Argument REVERSE means reverse order."
+  (interactive "P")
+  (gnus-summary-sort 'marks reverse))
+
 (defun gnus-summary-sort-by-original (&optional reverse)
   "Sort the summary buffer using the default sorting method.
 Argument REVERSE means reverse order."