(gnus-large-newsgroup): Mention gnus-large-ephemeral-newsgroup.

[gnus] / lisp / gnus-range.el

diff --git a/lisp/gnus-range.el b/lisp/gnus-range.el
index ed11547..a4262df 100644 (file)
--- a/lisp/gnus-range.el
+++ b/lisp/gnus-range.el
@@ -1,27 +1,25 @@
 ;;; gnus-range.el --- range and sequence functions for Gnus
 
 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
-;;   2005, 2006, 2007 Free Software Foundation, Inc.
+;;   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: news
 
 ;; This file is part of GNU Emacs.
 
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; GNU Emacs is free software: you can redistribute it and/or modify
 ;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation; either version 2, or (at your option)
-;; any later version.
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
 
 ;; GNU Emacs is distributed in the hope that it will be useful,
 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ;; GNU General Public License for more details.
 
 ;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING.  If not, write to the
-;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
 
 ;;; Commentary:
 
@@ -61,6 +59,36 @@ If RANGE is a single range, return (RANGE). Otherwise, return RANGE."
       (setq list2 (cdr list2)))
     list1))
 
+(defun gnus-range-nconcat (&rest ranges)
+  "Return a range comprising all the RANGES, which are pre-sorted.
+RANGES will be destructively altered."
+  (setq ranges (delete nil ranges))
+  (let* ((result (gnus-range-normalize (pop ranges)))
+        (last (last result)))
+    (dolist (range ranges)
+      (setq range (gnus-range-normalize range))
+      ;; Normalize the single-number case, so that we don't need to
+      ;; special-case that so much.
+      (when (numberp (car last))
+       (setcar last (cons (car last) (car last))))
+      (when (numberp (car range))
+       (setcar range (cons (car range) (car range))))
+      (if (= (1+ (cdar last)) (caar range))
+         (progn
+           (setcdr (car last) (cdar range))
+           (setcdr last (cdr range)))
+       (setcdr last range)
+       ;; Denormalize back, since we couldn't join the ranges up.
+       (when (= (caar range) (cdar range))
+         (setcar range (caar range)))
+       (when (= (caar last) (cdar last))
+         (setcar last (caar last))))
+      (setq last (last last)))
+    (if (and (consp (car result))
+            (= (length result) 1))
+       (car result)
+      result)))
+
 (defun gnus-range-difference (range1 range2)
   "Return the range of elements in RANGE1 that do not appear in RANGE2.
 Both ranges must be in ascending order."
@@ -189,7 +217,7 @@ LIST1 and LIST2 have to be sorted over <."
 RANGE1 and RANGE2 have to be sorted over <."
   (let* (out
          (min1 (car range1))
-         (max1 (if (numberp min1) 
+         (max1 (if (numberp min1)
                    (if (numberp (cdr range1))
                        (prog1 (cdr range1)
                          (setq range1 nil)) min1)
@@ -198,8 +226,8 @@ RANGE1 and RANGE2 have to be sorted over <."
          (min2 (car range2))
          (max2 (if (numberp min2)
                    (if (numberp (cdr range2))
-                       (prog1 (cdr range2) 
-                         (setq range2 nil)) min2) 
+                       (prog1 (cdr range2)
+                         (setq range2 nil)) min2)
                  (prog1 (cdr min2)
                    (setq min2 (car min2))))))
     (setq range1 (cdr range1)
@@ -656,5 +684,4 @@ LIST is a sorted list."
 
 (provide 'gnus-range)
 
-;;; arch-tag: 4780bdd8-5a15-4aff-be28-18727895b6ad
 ;;; gnus-range.el ends here