X-Git-Url: https://cgit.sxemacs.org/?a=blobdiff_plain;f=lisp%2Fgnus-cache.el;h=bc1f221a5c3f084b94d6f50fe3f556e260f6e7f1;hb=5b8ecce52d86ed7352e6e5b5d768c34321a4c58d;hp=b478acce0f2754016d75b1b9301db5453def209b;hpb=d5714bdba27dddaccae0c88a472cbc1a0513cabc;p=gnus

diff --git a/lisp/gnus-cache.el b/lisp/gnus-cache.el
index b478acce0..bc1f221a5 100644
--- a/lisp/gnus-cache.el
+++ b/lisp/gnus-cache.el
@@ -1,7 +1,7 @@
 ;;; gnus-cache.el --- cache interface for Gnus
-;; Copyright (C) 1995,96 Free Software Foundation, Inc.
+;; Copyright (C) 1995,96,97,98,99 Free Software Foundation, Inc.
 
-;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: news
 
 ;; This file is part of GNU Emacs.
@@ -25,33 +25,66 @@
 
 ;;; Code:
 
-(require 'gnus)
 (eval-when-compile (require 'cl))
 
-(defvar gnus-cache-directory
-  (nnheader-concat gnus-directory "cache/")
-  "*The directory where cached articles will be stored.")
+(require 'gnus)
+(require 'gnus-int)
+(require 'gnus-range)
+(require 'gnus-start)
+(eval-when-compile
+  (require 'gnus-sum))
 
-(defvar gnus-cache-active-file 
+(defcustom gnus-cache-active-file
   (concat (file-name-as-directory gnus-cache-directory) "active")
-  "*The cache active file.")
+  "*The cache active file."
+  :group 'gnus-cache
+  :type 'file)
+
+(defcustom gnus-cache-enter-articles '(ticked dormant)
+  "Classes of articles to enter into the cache."
+  :group 'gnus-cache
+  :type '(set (const ticked) (const dormant) (const unread) (const read)))
+
+(defcustom gnus-cache-remove-articles '(read)
+  "Classes of articles to remove from the cache."
+  :group 'gnus-cache
+  :type '(set (const ticked) (const dormant) (const unread) (const read)))
+
+(defcustom gnus-cacheable-groups nil
+  "*Groups that match this regexp will be cached.
 
-(defvar gnus-cache-enter-articles '(ticked dormant)
-  "*Classes of articles to enter into the cache.")
+If you only want to cache your nntp groups, you could set this
+variable to \"^nntp\".
 
-(defvar gnus-cache-remove-articles '(read)
-  "*Classes of articles to remove from the cache.")
+If a group matches both gnus-cacheable-groups and gnus-uncacheable-groups
+it's not cached."
+  :group 'gnus-cache
+  :type '(choice (const :tag "off" nil)
+                regexp))
 
-(defvar gnus-uncacheable-groups nil
+(defcustom gnus-uncacheable-groups nil
   "*Groups that match this regexp will not be cached.
 
 If you want to avoid caching your nnml groups, you could set this
-variable to \"^nnml\".")
+variable to \"^nnml\".
+
+If a group matches both gnus-cacheable-groups and gnus-uncacheable-groups
+it's not cached."
+  :group 'gnus-cache
+  :type '(choice (const :tag "off" nil)
+		 regexp))
+
+(defvar gnus-cache-overview-coding-system 'raw-text
+  "Coding system used on Gnus cache files.")
+
+(defvar gnus-cache-coding-system 'binary
+  "Coding system used on Gnus cache files.")
 
 
 
 ;;; Internal variables.
 
+(defvar gnus-cache-removable-articles nil)
 (defvar gnus-cache-buffer nil)
 (defvar gnus-cache-active-hashtb nil)
 (defvar gnus-cache-active-altered nil)
@@ -66,9 +99,14 @@ variable to \"^nnml\".")
 
 (defun gnus-cache-open ()
   "Initialize the cache."
-  (gnus-cache-read-active))
+  (when (or (file-exists-p gnus-cache-directory)
+	    (and gnus-use-cache
+		 (not (eq gnus-use-cache 'passive))))
+    (gnus-cache-read-active)))
 
-(gnus-add-shutdown 'gnus-cache-close 'gnus)
+;; Complexities of byte-compiling make this kludge necessary.  Eeek.
+(ignore-errors
+  (gnus-add-shutdown 'gnus-cache-close 'gnus))
 
 (defun gnus-cache-close ()
   "Shut down the cache."
@@ -79,102 +117,91 @@ variable to \"^nnml\".")
 (defun gnus-cache-save-buffers ()
   ;; save the overview buffer if it exists and has been modified
   ;; delete empty cache subdirectories
-  (if (null gnus-cache-buffer)
-      ()
+  (when gnus-cache-buffer
     (let ((buffer (cdr gnus-cache-buffer))
 	  (overview-file (gnus-cache-file-name
 			  (car gnus-cache-buffer) ".overview")))
       ;; write the overview only if it was modified
-      (if (buffer-modified-p buffer)
-	  (save-excursion
-	    (set-buffer buffer)
-	    (if (> (buffer-size) 0)
-		;; non-empty overview, write it out
-		(progn
-		  (gnus-make-directory (file-name-directory overview-file))
-		  (write-region (point-min) (point-max)
-				overview-file nil 'quietly))
-	      ;; empty overview file, remove it
-	      (and (file-exists-p overview-file)
-		   (delete-file overview-file))
-	      ;; if possible, remove group's cache subdirectory
-	      (condition-case nil
-		  ;; FIXME: we can detect the error type and warn the user
-		  ;; of any inconsistencies (articles w/o nov entries?).
-		  ;; for now, just be conservative...delete only if safe -- sj
-		  (delete-directory (file-name-directory overview-file))
-		(error nil)))))
-      ;; kill the buffer, it's either unmodified or saved
+      (when (buffer-modified-p buffer)
+	(save-excursion
+	  (set-buffer buffer)
+	  (if (> (buffer-size) 0)
+	      ;; Non-empty overview, write it to a file.
+	      (let ((coding-system-for-write
+		     gnus-cache-overview-coding-system))
+		(gnus-write-buffer overview-file))
+	    ;; Empty overview file, remove it
+	    (when (file-exists-p overview-file)
+	      (delete-file overview-file))
+	    ;; If possible, remove group's cache subdirectory.
+	    (condition-case nil
+		;; FIXME: we can detect the error type and warn the user
+		;; of any inconsistencies (articles w/o nov entries?).
+		;; for now, just be conservative...delete only if safe -- sj
+		(delete-directory (file-name-directory overview-file))
+	      (error nil)))))
+      ;; Kill the buffer -- it's either unmodified or saved.
       (gnus-kill-buffer buffer)
       (setq gnus-cache-buffer nil))))
 
-(defun gnus-cache-possibly-enter-article 
-  (group article headers ticked dormant unread &optional force)
+(defun gnus-cache-possibly-enter-article
+  (group article ticked dormant unread &optional force)
   (when (and (or force (not (eq gnus-use-cache 'passive)))
 	     (numberp article)
-	     (> article 0)
-	     (vectorp headers))	; This might be a dummy article.
-    ;; If this is a virtual group, we find the real group.
-    (when (gnus-virtual-group-p group)
-      (let ((result (nnvirtual-find-group-art 
-		     (gnus-group-real-name group) article)))
-	(setq group (car result)
-	      headers (copy-sequence headers))
-	(mail-header-set-number headers (cdr result))))
-    (let ((number (mail-header-number headers))
-	  file dir)
-      (when (and (> number 0)		; Reffed article.
-		 (or (not gnus-uncacheable-groups)
-		     (not (string-match gnus-uncacheable-groups group)))
+	     (> article 0))		; This might be a dummy article.
+    (let ((number article) file headers)
+      ;; If this is a virtual group, we find the real group.
+      (when (gnus-virtual-group-p group)
+	(let ((result (nnvirtual-find-group-art
+		       (gnus-group-real-name group) article)))
+	  (setq group (car result)
+		number (cdr result))))
+      (when (and number
+		 (> number 0)		; Reffed article.
 		 (or force
-		     (gnus-cache-member-of-class
-		      gnus-cache-enter-articles ticked dormant unread))
+                     (and (or (not gnus-cacheable-groups)
+                              (string-match gnus-cacheable-groups group))
+                          (or (not gnus-uncacheable-groups)
+			      (not (string-match
+				    gnus-uncacheable-groups group)))
+			  (gnus-cache-member-of-class
+			   gnus-cache-enter-articles ticked dormant unread)))
 		 (not (file-exists-p (setq file (gnus-cache-file-name
 						 group number)))))
 	;; Possibly create the cache directory.
-	(or (file-exists-p (setq dir (file-name-directory file)))
-	    (gnus-make-directory dir))
+	(gnus-make-directory (file-name-directory file))
 	;; Save the article in the cache.
 	(if (file-exists-p file)
 	    t				; The article already is saved.
 	  (save-excursion
 	    (set-buffer nntp-server-buffer)
-	    (let ((gnus-use-cache nil))
+	    (let ((gnus-use-cache nil)
+		  (gnus-article-decode-hook nil))
 	      (gnus-request-article-this-buffer number group))
 	    (when (> (buffer-size) 0)
-	      (write-region (point-min) (point-max) file nil 'quiet)
+	      (gnus-write-buffer file)
 	      (gnus-cache-change-buffer group)
 	      (set-buffer (cdr gnus-cache-buffer))
 	      (goto-char (point-max))
 	      (forward-line -1)
 	      (while (condition-case ()
-			 (and (not (bobp))
-			      (> (read (current-buffer)) number))
+			 (when (not (bobp))
+			   (> (read (current-buffer)) number))
 		       (error
 			;; The line was malformed, so we just remove it!!
 			(gnus-delete-line)
 			t))
 		(forward-line -1))
-	      (if (bobp) 
+	      (if (bobp)
 		  (if (not (eobp))
 		      (progn
 			(beginning-of-line)
-			(if (< (read (current-buffer)) number)
-			    (forward-line 1)))
+			(when (< (read (current-buffer)) number)
+			  (forward-line 1)))
 		    (beginning-of-line))
 		(forward-line 1))
 	      (beginning-of-line)
-	      ;; [number subject from date id references chars lines xref]
-	      (insert (format "%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t\n"
-			      (mail-header-number headers)
-			      (mail-header-subject headers)
-			      (mail-header-from headers)
-			      (mail-header-date headers)
-			      (mail-header-id headers)
-			      (or (mail-header-references headers) "")
-			      (or (mail-header-chars headers) "")
-			      (or (mail-header-lines headers) "")
-			      (or (mail-header-xref headers) "")))
+	      (nnheader-insert-nov headers)
 	      ;; Update the active info.
 	      (set-buffer gnus-summary-buffer)
 	      (gnus-cache-update-active group number)
@@ -209,14 +236,14 @@ variable to \"^nnml\".")
 	  article)
       (gnus-cache-change-buffer gnus-newsgroup-name)
       (while articles
-	(if (memq (setq article (pop articles)) cache-articles)
-	    ;; The article was in the cache, so we see whether we are
-	    ;; supposed to remove it from the cache.
-	    (gnus-cache-possibly-remove-article
-	     article (memq article gnus-newsgroup-marked)
-	     (memq article gnus-newsgroup-dormant)
-	     (or (memq article gnus-newsgroup-unreads)
-		 (memq article gnus-newsgroup-unselected))))))
+	(when (memq (setq article (pop articles)) cache-articles)
+	  ;; The article was in the cache, so we see whether we are
+	  ;; supposed to remove it from the cache.
+	  (gnus-cache-possibly-remove-article
+	   article (memq article gnus-newsgroup-marked)
+	   (memq article gnus-newsgroup-dormant)
+	   (or (memq article gnus-newsgroup-unreads)
+	       (memq article gnus-newsgroup-unselected))))))
     ;; The overview file might have been modified, save it
     ;; safe because we're only called at group exit anyway.
     (gnus-cache-save-buffers)))
@@ -228,22 +255,23 @@ variable to \"^nnml\".")
     (when (file-exists-p file)
       (erase-buffer)
       (gnus-kill-all-overlays)
-      (insert-file-contents file)
+      (let ((coding-system-for-read gnus-cache-coding-system))
+	(insert-file-contents file))
       t)))
 
 (defun gnus-cache-possibly-alter-active (group active)
   "Alter the ACTIVE info for GROUP to reflect the articles in the cache."
-  (let ((cache-active (gnus-gethash group gnus-cache-active-hashtb)))
-    (and cache-active 
-	 (< (car cache-active) (car active))
-	 (setcar active (car cache-active)))
-    (and cache-active
-	 (> (cdr cache-active) (cdr active))
-	 (setcdr active (cdr cache-active)))))
+  (when gnus-cache-active-hashtb
+    (let ((cache-active (gnus-gethash group gnus-cache-active-hashtb)))
+      (when cache-active
+	(when (< (car cache-active) (car active))
+	  (setcar active (car cache-active)))
+	(when (> (cdr cache-active) (cdr active))
+	  (setcdr active (cdr cache-active)))))))
 
 (defun gnus-cache-retrieve-headers (articles group &optional fetch-old)
   "Retrieve the headers for ARTICLES in GROUP."
-  (let ((cached 
+  (let ((cached
 	 (setq gnus-newsgroup-cached (gnus-cache-articles-in-group group))))
     (if (not cached)
 	;; No cached articles here, so we just retrieve them
@@ -255,12 +283,12 @@ variable to \"^nnml\".")
 				articles))
 	    (cache-file (gnus-cache-file-name group ".overview"))
 	    type)
-	;; We first retrieve all the headers that we don't have in 
+	;; We first retrieve all the headers that we don't have in
 	;; the cache.
 	(let ((gnus-use-cache nil))
 	  (when uncached-articles
-	    (setq type (and articles 
-			    (gnus-retrieve-headers 
+	    (setq type (and articles
+			    (gnus-retrieve-headers
 			     uncached-articles group fetch-old)))))
 	(gnus-cache-save-buffers)
 	;; Then we insert the cached headers.
@@ -270,7 +298,7 @@ variable to \"^nnml\".")
 	    ;; There are no cached headers.
 	    type)
 	   ((null type)
-	    ;; There were no uncached headers (or retrieval was 
+	    ;; There were no uncached headers (or retrieval was
 	    ;; unsuccessful), so we use the cached headers exclusively.
 	    (set-buffer nntp-server-buffer)
 	    (erase-buffer)
@@ -292,16 +320,16 @@ variable to \"^nnml\".")
 If not given a prefix, use the process marked articles instead.
 Returns the list of articles entered."
   (interactive "P")
-  (gnus-set-global-variables)
   (let ((articles (gnus-summary-work-articles n))
 	article out)
-    (while articles
-      (setq article (pop articles))
-      (when (gnus-cache-possibly-enter-article 
-	     gnus-newsgroup-name article (gnus-summary-article-header article)
-	     nil nil nil t)
-	(push article out))
+    (while (setq article (pop articles))
       (gnus-summary-remove-process-mark article)
+      (if (natnump article)
+	  (when (gnus-cache-possibly-enter-article
+		 gnus-newsgroup-name article
+		 nil nil nil t)
+	    (push article out))
+	(gnus-message 2 "Can't cache article %d" article))
       (gnus-summary-update-secondary-mark article))
     (gnus-summary-next-subject 1)
     (gnus-summary-position-point)
@@ -312,15 +340,14 @@ Returns the list of articles entered."
 If not given a prefix, use the process marked articles instead.
 Returns the list of articles removed."
   (interactive "P")
-  (gnus-set-global-variables)
   (gnus-cache-change-buffer gnus-newsgroup-name)
   (let ((articles (gnus-summary-work-articles n))
 	article out)
     (while articles
       (setq article (pop articles))
+      (gnus-summary-remove-process-mark article)
       (when (gnus-cache-possibly-remove-article article nil nil nil t)
 	(push article out))
-      (gnus-summary-remove-process-mark article)
       (gnus-summary-update-secondary-mark article))
     (gnus-summary-next-subject 1)
     (gnus-summary-position-point)
@@ -330,6 +357,19 @@ Returns the list of articles removed."
   "Say whether ARTICLE is cached in the current group."
   (memq article gnus-newsgroup-cached))
 
+(defun gnus-summary-insert-cached-articles ()
+  "Insert all the articles cached for this group into the current buffer."
+  (interactive)
+  (let ((cached (sort (copy-sequence gnus-newsgroup-cached) '<))
+	(gnus-verbose (max 6 gnus-verbose)))
+    (unless cached
+      (gnus-message 3 "No cached articles for this group"))
+    (while cached
+      (gnus-summary-goto-subject (pop cached) t))))
+
+(defalias 'gnus-summary-limit-include-cached
+  'gnus-summary-insert-cached-articles)
+
 ;;; Internal functions.
 
 (defun gnus-cache-change-buffer (group)
@@ -339,21 +379,21 @@ Returns the list of articles removed."
 	   ;; Another overview cache is current, save it.
 	   (gnus-cache-save-buffers)))
   ;; if gnus-cache buffer is nil, create it
-  (or gnus-cache-buffer
-      ;; Create cache buffer
-      (save-excursion
-	(setq gnus-cache-buffer
-	      (cons group
-		    (set-buffer (get-buffer-create " *gnus-cache-overview*"))))
-	(buffer-disable-undo (current-buffer))
-	;; Insert the contents of this group's cache overview.
-	(erase-buffer)
-	(let ((file (gnus-cache-file-name group ".overview")))
-	  (and (file-exists-p file)
-	       (insert-file-contents file)))
-	;; We have a fresh (empty/just loaded) buffer, 
-	;; mark it as unmodified to save a redundant write later.
-	(set-buffer-modified-p nil))))
+  (unless gnus-cache-buffer
+    ;; Create cache buffer
+    (save-excursion
+      (setq gnus-cache-buffer
+	    (cons group
+		  (set-buffer (gnus-get-buffer-create
+			       " *gnus-cache-overview*"))))
+      ;; Insert the contents of this group's cache overview.
+      (erase-buffer)
+      (let ((file (gnus-cache-file-name group ".overview")))
+	(when (file-exists-p file)
+	  (nnheader-insert-file-contents file)))
+      ;; We have a fresh (empty/just loaded) buffer,
+      ;; mark it as unmodified to save a redundant write later.
+      (set-buffer-modified-p nil))))
 
 ;; Return whether an article is a member of a class.
 (defun gnus-cache-member-of-class (class ticked dormant unread)
@@ -365,23 +405,27 @@ Returns the list of articles removed."
 (defun gnus-cache-file-name (group article)
   (concat (file-name-as-directory gnus-cache-directory)
 	  (file-name-as-directory
-	   (if (gnus-use-long-file-name 'not-cache)
-	       group 
-	     (let ((group (concat group "")))
-	       (if (string-match ":" group)
-		   (aset group (match-beginning 0) ?/))
-	       (nnheader-replace-chars-in-string group ?. ?/))))
+	   (nnheader-translate-file-chars
+	    (if (gnus-use-long-file-name 'not-cache)
+		group
+	      (let ((group (nnheader-replace-chars-in-string group ?/ ?_)))
+		;; Translate the first colon into a slash.
+		(when (string-match ":" group)
+		  (aset group (match-beginning 0) ?/))
+		(nnheader-replace-chars-in-string group ?. ?/)))
+	    t))
 	  (if (stringp article) article (int-to-string article))))
 
 (defun gnus-cache-update-article (group article)
   "If ARTICLE is in the cache, remove it and re-enter it."
+  (gnus-cache-change-buffer group)
   (when (gnus-cache-possibly-remove-article article nil nil nil t)
     (let ((gnus-use-cache nil))
-      (gnus-cache-possibly-enter-article 
-       gnus-newsgroup-name article (gnus-summary-article-header article)
+      (gnus-cache-possibly-enter-article
+       gnus-newsgroup-name article
        nil nil nil t))))
 
-(defun gnus-cache-possibly-remove-article (article ticked dormant unread 
+(defun gnus-cache-possibly-remove-article (article ticked dormant unread
 						   &optional force)
   "Possibly remove ARTICLE from the cache."
   (let ((group gnus-newsgroup-name)
@@ -389,7 +433,7 @@ Returns the list of articles removed."
 	file)
     ;; If this is a virtual group, we find the real group.
     (when (gnus-virtual-group-p group)
-      (let ((result (nnvirtual-find-group-art 
+      (let ((result (nnvirtual-find-group-art
 		     (gnus-group-real-name group) article)))
 	(setq group (car result)
 	      number (cdr result))))
@@ -402,11 +446,11 @@ Returns the list of articles removed."
 	(delete-file file)
 	(set-buffer (cdr gnus-cache-buffer))
 	(goto-char (point-min))
-	(if (or (looking-at (concat (int-to-string number) "\t"))
-		(search-forward (concat "\n" (int-to-string number) "\t")
-				(point-max) t))
-	    (delete-region (progn (beginning-of-line) (point))
-			   (progn (forward-line 1) (point)))))
+	(when (or (looking-at (concat (int-to-string number) "\t"))
+		  (search-forward (concat "\n" (int-to-string number) "\t")
+				  (point-max) t))
+	  (delete-region (progn (beginning-of-line) (point))
+			 (progn (forward-line 1) (point)))))
       (setq gnus-newsgroup-cached
 	    (delq article gnus-newsgroup-cached))
       (gnus-summary-update-secondary-mark article)
@@ -417,19 +461,24 @@ Returns the list of articles removed."
   (let ((dir (file-name-directory (gnus-cache-file-name group 1)))
 	articles)
     (when (file-exists-p dir)
-      (sort (mapcar (lambda (name) (string-to-int name)) 
-		    (directory-files dir nil "^[0-9]+$" t))
-	    '<))))
-
-(defun gnus-cache-braid-nov (group cached)
-  (let ((cache-buf (get-buffer-create " *gnus-cache*"))
+      (setq articles
+	    (sort (mapcar (lambda (name) (string-to-int name))
+			  (directory-files dir nil "^[0-9]+$" t))
+		  '<))
+      ;; Update the cache active file, just to synch more.
+      (when articles
+	(gnus-cache-update-active group (car articles) t)
+	(gnus-cache-update-active group (car (last articles))))
+      articles)))
+
+(defun gnus-cache-braid-nov (group cached &optional file)
+  (let ((cache-buf (gnus-get-buffer-create " *gnus-cache*"))
 	beg end)
     (gnus-cache-save-buffers)
     (save-excursion
       (set-buffer cache-buf)
-      (buffer-disable-undo (current-buffer))
       (erase-buffer)
-      (insert-file-contents (gnus-cache-file-name group ".overview"))
+      (insert-file-contents (or file (gnus-cache-file-name group ".overview")))
       (goto-char (point-min))
       (insert "\n")
       (goto-char (point-min)))
@@ -447,16 +496,16 @@ Returns the list of articles removed."
 	    (setq beg (progn (beginning-of-line) (point))
 		  end (progn (end-of-line) (point)))
 	  (setq beg nil)))
-      (if beg (progn (insert-buffer-substring cache-buf beg end)
-		     (insert "\n")))
+      (when beg
+	(insert-buffer-substring cache-buf beg end)
+	(insert "\n"))
       (setq cached (cdr cached)))
     (kill-buffer cache-buf)))
 
 (defun gnus-cache-braid-heads (group cached)
-  (let ((cache-buf (get-buffer-create " *gnus-cache*")))
+  (let ((cache-buf (gnus-get-buffer-create " *gnus-cache*")))
     (save-excursion
       (set-buffer cache-buf)
-      (buffer-disable-undo (current-buffer))
       (erase-buffer))
     (set-buffer nntp-server-buffer)
     (goto-char (point-min))
@@ -486,7 +535,10 @@ Returns the list of articles removed."
 
 ;;;###autoload
 (defun gnus-jog-cache ()
-  "Go through all groups and put the articles into the cache."
+  "Go through all groups and put the articles into the cache.
+
+Usage:
+$ emacs -batch -l ~/.emacs -l gnus -f gnus-jog-cache"
   (interactive)
   (let ((gnus-mark-article-hook nil)
 	(gnus-expert-user t)
@@ -498,22 +550,22 @@ Returns the list of articles removed."
     (gnus)
     ;; Go through all groups...
     (gnus-group-mark-buffer)
-    (gnus-group-universal-argument 
-     nil nil 
-     (lambda ()
-       (gnus-summary-read-group nil nil t)
-       ;; ... and enter the articles into the cache.
-       (when (eq major-mode 'gnus-summary-mode)
-	 (gnus-uu-mark-buffer)
-	 (gnus-cache-enter-article)
-	 (kill-buffer (current-buffer)))))))
+    (gnus-group-iterate nil
+      (lambda (group)
+	(let (gnus-auto-select-next)
+	  (gnus-summary-read-group group nil t)
+	  ;; ... and enter the articles into the cache.
+	  (when (eq major-mode 'gnus-summary-mode)
+	    (gnus-uu-mark-buffer)
+	    (gnus-cache-enter-article)
+	    (kill-buffer (current-buffer))))))))
 
 (defun gnus-cache-read-active (&optional force)
   "Read the cache active file."
-  (unless (file-exists-p gnus-cache-directory)
-    (make-directory gnus-cache-directory t))
-  (if (not (and (file-exists-p gnus-cache-active-file)
-		(or force (not gnus-cache-active-hashtb))))
+  (gnus-make-directory gnus-cache-directory)
+  (if (or (not (file-exists-p gnus-cache-active-file))
+	  (zerop (nth 7 (file-attributes gnus-cache-active-file)))
+	  force)
       ;; There is no active file, so we generate one.
       (gnus-cache-generate-active)
     ;; We simply read the active file.
@@ -521,28 +573,24 @@ Returns the list of articles removed."
       (gnus-set-work-buffer)
       (insert-file-contents gnus-cache-active-file)
       (gnus-active-to-gnus-format
-       nil (setq gnus-cache-active-hashtb 
-		 (gnus-make-hashtable 
+       nil (setq gnus-cache-active-hashtb
+		 (gnus-make-hashtable
 		  (count-lines (point-min) (point-max)))))
       (setq gnus-cache-active-altered nil))))
-       
+
 (defun gnus-cache-write-active (&optional force)
   "Write the active hashtb to the active file."
   (when (or force
 	    (and gnus-cache-active-hashtb
 		 gnus-cache-active-altered))
-    (save-excursion
-      (gnus-set-work-buffer)
+    (with-temp-file gnus-cache-active-file
       (mapatoms
        (lambda (sym)
 	 (when (and sym (boundp sym))
 	   (insert (format "%s %d %d y\n"
 			   (symbol-name sym) (cdr (symbol-value sym))
 			   (car (symbol-value sym))))))
-       gnus-cache-active-hashtb)
-      (gnus-make-directory (file-name-directory gnus-cache-active-file))
-      (write-region 
-       (point-min) (point-max) gnus-cache-active-file nil 'silent))
+       gnus-cache-active-hashtb))
     ;; Mark the active hashtb as unaltered.
     (setq gnus-cache-active-altered nil)))
 
@@ -556,9 +604,9 @@ If LOW, update the lower bound instead."
       ;; Update the lower or upper bound.
       (if low
 	  (setcar active number)
-	(setcdr active number))
-      ;; Mark the active hashtb as altered.
-      (setq gnus-cache-active-altered t))))
+	(setcdr active number)))
+    ;; Mark the active hashtb as altered.
+    (setq gnus-cache-active-altered t)))
 
 ;;;###autoload
 (defun gnus-cache-generate-active (&optional directory)
@@ -567,20 +615,23 @@ If LOW, update the lower bound instead."
   (let* ((top (null directory))
 	 (directory (expand-file-name (or directory gnus-cache-directory)))
 	 (files (directory-files directory 'full))
-	 (group 
+	 (group
 	  (if top
 	      ""
-	    (string-match 
-	     (concat "^" (file-name-as-directory
-			  (expand-file-name gnus-cache-directory)))
+	    (string-match
+	     (concat "^" (regexp-quote
+			  (file-name-as-directory
+			   (expand-file-name gnus-cache-directory))))
 	     (directory-file-name directory))
-	    (nnheader-replace-chars-in-string 
+	    (nnheader-replace-chars-in-string
 	     (substring (directory-file-name directory) (match-end 0))
 	     ?/ ?.)))
 	 nums alphs)
     (when top
       (gnus-message 5 "Generating the cache active file...")
       (setq gnus-cache-active-hashtb (gnus-make-hashtable 123)))
+    (when (string-match "^\\(nn[^_]+\\)_" group)
+      (setq group (replace-match "\\1:" t t group)))
     ;; Separate articles from all other files and directories.
     (while files
       (if (string-match "^[0-9]+$" (file-name-nondirectory (car files)))
@@ -593,7 +644,7 @@ If LOW, update the lower bound instead."
     ;; Go through all the other files.
     (while alphs
       (when (and (file-directory-p (car alphs))
-		 (not (string-match "^\\.\\.?$"
+		 (not (string-match "^\\."
 				    (file-name-nondirectory (car alphs)))))
 	;; We descend directories.
 	(gnus-cache-generate-active (car alphs)))
@@ -611,6 +662,11 @@ If LOW, update the lower bound instead."
   (let ((nnml-generate-active-function 'identity))
     (nnml-generate-nov-databases-1 dir)))
 
+(defun gnus-cache-move-cache (dir)
+  "Move the cache tree to somewhere else."
+  (interactive "FMove the cache tree to: ")
+  (rename-file gnus-cache-directory dir))
+
 (provide 'gnus-cache)
-	      
+
 ;;; gnus-cache.el ends here