Imap client: Implement SUBSCRIBE and UNSUBSCRIBE.

* include/mailutils/imap.h (mu_imap_subscribe)
(mu_imap_unsubscribe): New protos.
* include/mailutils/sys/imap.h (MU_IMAP_CLIENT_SUBSCRIBE_RX)
(MU_IMAP_CLIENT_UNSUBSCRIBE_RX): New states.
* libproto/imap/Makefile.am (libmu_imap_la_SOURCES): Add
subscribe.c and unsubscribe.c
* libproto/imap/subscribe.c: New file.
* libproto/imap/unsubscribe.c: New file.
* mu/imap.c: Implement subscribe/unsubscribe.

@@ -91,6 +91,9 @@ int mu_imap_list (mu_imap_t imap, const char *refname, const char *mboxname,
 		  mu_list_t retlist);
 int mu_imap_list_new (mu_imap_t imap, const char *refname, const char *mboxname,
 		      mu_list_t *plist);
+
+int mu_imap_subscribe (mu_imap_t imap, const char *mailbox);
+int mu_imap_unsubscribe (mu_imap_t imap, const char *mailbox);
   
 int mu_imap_set_carrier (mu_imap_t imap, mu_stream_t carrier);
 int mu_imap_get_carrier (mu_imap_t imap, mu_stream_t *pcarrier);

@@ -67,6 +67,8 @@ enum mu_imap_client_state
     MU_IMAP_CLIENT_EXPUNGE_RX,
     MU_IMAP_CLIENT_APPEND_RX,
     MU_IMAP_CLIENT_LIST_RX,
+    MU_IMAP_CLIENT_SUBSCRIBE_RX,
+    MU_IMAP_CLIENT_UNSUBSCRIBE_RX,
     MU_IMAP_CLIENT_CLOSING
   };
 

@@ -61,7 +61,9 @@ libmu_imap_la_SOURCES = \
  state.c\
  status.c\
  store.c\
+ subscribe.c\
  tag.c\
  trace.c\
- unselect.c
+ unselect.c\
+ unsubscribe.c
 

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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 GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General
+   Public License along with this library.  If not, see
+   <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <mailutils/imap.h>
+#include <mailutils/sys/imap.h>
+
+int
+mu_imap_subscribe (mu_imap_t imap, const char *mailbox)
+{
+  char const *argv[2];
+  static struct imap_command com;
+
+  argv[0] = "SUBSCRIBE";
+  argv[1] = mailbox;
+
+  com.session_state = MU_IMAP_SESSION_AUTH;
+  com.capa = NULL;
+  com.rx_state = MU_IMAP_CLIENT_SUBSCRIBE_RX;
+  com.argc = 2;
+  com.argv = argv;
+  com.extra = NULL;
+  com.tagged_handler = NULL;
+  com.untagged_handler = NULL;
+
+  return mu_imap_gencom (imap, &com);
+}
+      

+/* GNU Mailutils -- a suite of utilities for electronic mail
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   This library 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 GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General
+   Public License along with this library.  If not, see
+   <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <mailutils/imap.h>
+#include <mailutils/sys/imap.h>
+
+int
+mu_imap_unsubscribe (mu_imap_t imap, const char *mailbox)
+{
+  char const *argv[2];
+  static struct imap_command com;
+
+  argv[0] = "UNSUBSCRIBE";
+  argv[1] = mailbox;
+
+  com.session_state = MU_IMAP_SESSION_AUTH;
+  com.capa = NULL;
+  com.rx_state = MU_IMAP_CLIENT_UNSUBSCRIBE_RX;
+  com.argc = 2;
+  com.argv = argv;
+  com.extra = NULL;
+  com.tagged_handler = NULL;
+  com.untagged_handler = NULL;
+
+  return mu_imap_gencom (imap, &com);
+}
+      

@@ -818,6 +818,24 @@ com_create (int argc, char **argv)
 }
 
 static int
+com_subscribe (int argc, char **argv)
+{
+  int status = mu_imap_subscribe (imap, argv[1]);
+  if (status)
+    report_failure ("subscribe", status);
+  return 0;
+}
+
+static int
+com_unsubscribe (int argc, char **argv)
+{
+  int status = mu_imap_unsubscribe (imap, argv[1]);
+  if (status)
+    report_failure ("unsubscribe", status);
+  return 0;
+}
+
+static int
 com_append (int argc, char **argv)
 {
   struct tm tmbuf, *tm = NULL;
@@ -1023,6 +1041,14 @@ struct mutool_command imap_comtab[] = {
     com_list,
     N_("REF MBOX"),
     N_("List matching mailboxes") },
+  { "subscribe",    2, 2, 0,
+    com_subscribe,
+    N_("MBOX"),
+    N_("Subscribe to a mailbox") },
+  { "unsubscribe",    2, 2, 0,
+    com_unsubscribe,
+    N_("MBOX"),
+    N_("Remove mailbox from subscription list") },
   { "quit",         1, 1, 0,
     com_logout,
     NULL,