Implement two new Scheme functions.

* NEWS: Update.
* configure.ac: Version 2.99.97
* libmu_scm/mu_mailbox.c (mu-mailbox-sync)
(mu-mailbox-flush): New functions.

-GNU mailutils NEWS -- history of user-visible changes. 2012-05-31
+GNU mailutils NEWS -- history of user-visible changes. 2012-06-07
 Copyright (C) 2002-2012 Free Software Foundation, Inc.
 See the end of file for copying conditions.
 
 Please send mailutils bug reports to <bug-mailutils@gnu.org>.
 
 
-Version 2.99.96 (Git)
+Version 2.99.97 (Git)
 
 This version is a major rewrite of GNU Mailutils.  Quite a few parts
 of the basic framework were rewritten from scratch, while some others
@@ -254,6 +254,24 @@ See <http://mailutils.org/wiki/debug_level>.
 
 ** Configuration file support (libmu_cfg) rewritten.
 
+* New Scheme primitives
+
+** mu-mailbox-sync
+
+Synchronizes the changes done to the mailbox with its external
+storage.
+
+** mu-mailbox-expunge
+
+Similar to mu-mailbox-sync, but also permanently removes messages
+marked for deletion.
+
+** mu-mailbox-flush
+
+Marks all messages as seen, and synchronizes the changes with the
+mailbox external storage.  Depending on its second argument, removes
+messages marked for deletion.
+
 
 Version 2.2 - 2010-09-08
 

@@ -16,7 +16,7 @@ dnl You should have received a copy of the GNU General Public License along
 dnl with GNU Mailutils.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ(2.63)
-AC_INIT([GNU Mailutils], [2.99.96], [bug-mailutils@gnu.org], [mailutils])
+AC_INIT([GNU Mailutils], [2.99.97], [bug-mailutils@gnu.org], [mailutils])
 AC_CONFIG_SRCDIR([libmailutils/mailbox/mailbox.c])
 AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([gnits 1.11 dist-bzip2 dist-xz std-options silent-rules])

@@ -373,6 +373,51 @@ SCM_DEFINE_PUBLIC (scm_mu_mailbox_expunge, "mu-mailbox-expunge", 1, 0, 0,
 }
 #undef FUNC_NAME
 
+SCM_DEFINE_PUBLIC (scm_mu_mailbox_sync, "mu-mailbox-sync", 1, 0, 0,
+		   (SCM mbox), 
+"Synchronize changes to @var{mbox} with its storage.")
+#define FUNC_NAME s_scm_mu_mailbox_sync
+{
+  struct mu_mailbox *mum;
+  int status;
+    
+  SCM_ASSERT (mu_scm_is_mailbox (mbox), mbox, SCM_ARG1, FUNC_NAME);
+  mum = (struct mu_mailbox *) SCM_CDR (mbox);
+  status = mu_mailbox_sync (mum->mbox);
+  if (status)
+    mu_scm_error (FUNC_NAME, status,
+		  "Sync failed for mailbox ~A",
+		  scm_list_1 (mbox));
+  return SCM_BOOL_T;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE_PUBLIC (scm_mu_mailbox_flush, "mu-mailbox-flush", 1, 1, 0,
+		   (SCM mbox, SCM expunge), 
+"Mark all messages in @var{mbox} as seen and synchronize all changes with "
+"its storage.  If @var{expunge} is @samp{#t}, expunge deleted messages "
+"as well.")
+#define FUNC_NAME s_scm_mu_mailbox_flush
+{
+  struct mu_mailbox *mum;
+  int status, do_expunge = 0;
+    
+  SCM_ASSERT (mu_scm_is_mailbox (mbox), mbox, SCM_ARG1, FUNC_NAME);
+  mum = (struct mu_mailbox *) SCM_CDR (mbox);
+  if (!SCM_UNBNDP (expunge))
+    {
+      SCM_ASSERT (scm_is_bool (expunge), expunge, SCM_ARG2, FUNC_NAME);
+      do_expunge = expunge == SCM_BOOL_T;
+    }
+  status = mu_mailbox_flush (mum->mbox, do_expunge);
+  if (status)
+    mu_scm_error (FUNC_NAME, status,
+		  "Flush failed for mailbox ~A",
+		  scm_list_1 (mbox));
+  return SCM_BOOL_T;
+}
+#undef FUNC_NAME
+
 SCM_DEFINE_PUBLIC (scm_mu_mailbox_append_message, "mu-mailbox-append-message", 2, 0, 0,
 		   (SCM mbox, SCM mesg),
 		   "Appends message @var{mesg} to the mailbox @var{mbox}.")