Change attribute handling in Maildir format.

* include/mailutils/message.h (MU_MSG_ATTRIBUTE_MODIFIED)
(MU_MSG_HEADER_MODIFIED,MU_MSG_BODY_MODIFIED): New flags.
* libmailutils/mailbox/message.c (mu_message_is_modified): Return
a bitmask from the above values.
* libmailutils/property/create.c (mu_property_create_init): Return
error code.

* include/mailutils/sys/amd.h (_amd_data) <chattr_msg>
<capabilities, prop>: New members.
<uidvalidity>: Remove.
* libmailutils/base/amd.c: Use MH-style proplist to keep
the mailbox properties: uidvalidity, last uid and to
cache its size.
Store message attributes in the message header only if the
mailbox implementation is unable to keep them elsewhere.
Use chattr_msg method (if provided) to flush changes in
message attributes.

* libproto/maildir/folder.c (_maildir_list_p): Ignore .mh* and .mu* files.
* libproto/mh/folder.c (_mh_list_p): Likewise.
* libproto/maildir/mbox.c: Implement all Maildir flags (except P).
Implement the chattr_msg method.
* libproto/mh/mbox.c: Remove special handling for uidvalidity.
* mh/tests/folder.at: Ignore .mu-prop in directory listings.

@@ -53,6 +53,11 @@ extern void mu_message_destroy (mu_message_t *, void *owner);
 extern int mu_message_create_copy (mu_message_t *to, mu_message_t from);
 
 extern void *mu_message_get_owner (mu_message_t);
+
+#define MU_MSG_ATTRIBUTE_MODIFIED 0x01
+#define MU_MSG_HEADER_MODIFIED    0x02 
+#define MU_MSG_BODY_MODIFIED      0x04
+
 extern int mu_message_is_modified (mu_message_t);
 extern int mu_message_clear_modified (mu_message_t);
 extern int mu_message_get_mailbox (mu_message_t, mu_mailbox_t *);

@@ -43,7 +43,13 @@
       mu_monitor_wrlock (mbox->monitor);				\
 } while (0);
 
-# define MU_AMD_SIZE_FILE_NAME ".mu-size"
+#define _MU_AMD_PROP_UIDVALIDITY "uid-validity"
+#define _MU_AMD_PROP_NEXT_UID "next-uid"
+#define _MU_AMD_PROP_SIZE "size"
+
+#define _MU_AMD_PROP_FILE_NAME ".mu-prop"
+/* Legacy (2.x) size file name */
+#define _MU_AMD_SIZE_FILE_NAME ".mu-size"
 
 struct _amd_data;
 struct _amd_message
@@ -64,6 +70,10 @@ struct _amd_message
   struct _amd_data *amd;    /* Back pointer.  */
 };
 
+/* AMD capabilities */
+#define MU_AMD_STATUS    0x01  /* format keeps status flags */
+#define MU_AMD_IMAPBASE  0x02  /* format keeps IMAP base */
+
 struct _amd_data
 {
   size_t msg_size;               /* Size of struct _amd_message */
@@ -83,16 +93,19 @@ struct _amd_data
   size_t (*next_uid) (struct _amd_data *mhd);
   int (*remove) (struct _amd_data *);
   int (*delete_msg) (struct _amd_data *, struct _amd_message *);
-		     
+  int (*chattr_msg) (struct _amd_message *, int);
+  
   /* List of messages: */
   size_t msg_count; /* number of messages in the list */
   size_t msg_max;   /* maximum message buffer capacity */
   struct _amd_message **msg_array;
 
-  unsigned long uidvalidity;
+  int capabilities;
   int has_new_msg;  /* New messages have been appended */
   char *name;                    /* Directory name */
 
+  mu_property_t prop; /* Properties: uidvalidity, nextuid, etc. */
+  
   /* Pool of open message streams */
   struct _amd_message *msg_pool[MAX_OPEN_STREAMS];
   int pool_first;    /* Index to the first used entry in msg_pool */

@@ -667,10 +667,14 @@ mu_message_is_modified (mu_message_t msg)
   int mod = 0;
   if (msg)
     {
-      mod |= mu_header_is_modified (msg->header);
-      mod |= mu_attribute_is_modified (msg->attribute);
-      mod |= mu_body_is_modified (msg->body);
-      mod |= msg->flags;
+      if (mu_header_is_modified (msg->header))
+	mod |= MU_MSG_HEADER_MODIFIED;
+      if (mu_attribute_is_modified (msg->attribute))
+	mod |= MU_MSG_ATTRIBUTE_MODIFIED;
+      if (mu_body_is_modified (msg->body))
+	mod |= MU_MSG_BODY_MODIFIED;
+      if (msg->flags & MESSAGE_MODIFIED)
+	mod |= MU_MSG_BODY_MODIFIED | MU_MSG_HEADER_MODIFIED;
     }
   return mod;
 }

@@ -45,7 +45,7 @@ mu_property_create_init (mu_property_t *pprop,
       mu_property_set_init (prop, initfun, initdata);
       *pprop = prop;
     }
-  return 0;
+  return rc;
 }
 
 int

@@ -92,7 +92,8 @@ _maildir_list_p (mu_record_t record, const char *name, int flags MU_ARG_UNUSED)
   return strcmp (name, TMPSUF)
     && strcmp (name, CURSUF) 
     && strcmp (name, NEWSUF)
-    && strcmp (name, MU_AMD_SIZE_FILE_NAME);
+    && !((strlen (name) > 3) &&
+	 (memcmp (name, ".mh", 3) == 0 || memcmp (name, ".mu", 3) == 0));
 }
 
 static struct _mu_record _maildir_record =

@@ -84,19 +84,24 @@ struct _maildir_message
 
 
 /* Attribute handling.
-   FIXME: P (Passed), D (Draft) and F (Flagged) are not handled */
+   FIXME: P (Passed) is not handled */
 
 static struct info_map {
   char letter;
   int flag;
 } info_map[] = {
+  { 'D', MU_ATTRIBUTE_DRAFT },
+  { 'F', MU_ATTRIBUTE_FLAGGED },
+  { 'P', 0 }, /* (passed): the user has resent/forwarded/bounced this
+		 message to someone else. */
   { 'R', MU_ATTRIBUTE_READ },
   { 'S', MU_ATTRIBUTE_SEEN },
   { 'T', MU_ATTRIBUTE_DELETED },
+  { 'a', MU_ATTRIBUTE_ANSWERED },
 };
 #define info_map_size (sizeof (info_map) / sizeof (info_map[0]))
 
-/* NOTE: BUF must be at least 7 bytes long */
+/* NOTE: BUF must be at least info_map_size bytes long */
 static int
 flags_to_info (int flags, char *buf)
 {
@@ -254,7 +259,7 @@ maildir_mkfilename (const char *directory, const char *suffix, const char *name)
 static char *
 mk_info_filename (char *directory, char *suffix, char *name, int flags)
 {
-  char fbuf[9];
+  char fbuf[info_map_size + 1];
   char *tmp;
   int namelen;
   size_t size;
@@ -691,23 +696,6 @@ maildir_scan0 (mu_mailbox_t mailbox, size_t msgno MU_ARG_UNUSED,
   if (pcount)
     *pcount = amd->msg_count;
 
-  /* Reset the uidvalidity.  */
-  if (amd->msg_count > 0)
-    {
-      if (amd->uidvalidity == 0)
-	{
-	  amd->uidvalidity = (unsigned long) time (NULL);
-	  /* FIXME amd->uidnext = amd->msg_count + 1;*/
-	  /* Tell that we have been modified for expunging.  */
-	  if (amd->msg_count)
-	    {
-	      amd_message_stream_open (amd->msg_array[0]);
-	      amd_message_stream_close (amd->msg_array[0]);
-	      amd->msg_array[0]->attr_flags |= MU_ATTRIBUTE_MODIFIED;
-	    }
-	}
-    }
-
   /* Clean up the things */
   amd_cleanup (mailbox);
   return status;
@@ -773,6 +761,42 @@ maildir_remove (struct _amd_data *amd)
   return rc;
 }
 
+
+static int
+maildir_chattr_msg (struct _amd_message *amsg, int expunge)
+{
+  struct _maildir_message *mp = (struct _maildir_message *) amsg;
+  struct _amd_data *amd = amsg->amd;
+  int rc;
+  char *new_name;
+  
+  rc = amd->new_msg_file_name (amsg, amsg->attr_flags, expunge, &new_name);
+  if (rc)
+    return rc;
+  if (!new_name)
+    {
+      if (unlink (mp->file_name))
+	rc = errno;
+    }
+  else
+    {
+      char *cur_name;
+      
+      rc = maildir_cur_message_name (amsg, &cur_name);
+      if (rc)
+	{
+	  free (new_name);
+	  return rc;
+	}
+      if (rename (cur_name, new_name))
+	rc = errno;
+      free (cur_name);
+    }
+
+  free (new_name);
+  return rc;
+}
+
      
 int
 _mailbox_maildir_init (mu_mailbox_t mailbox)
@@ -797,6 +821,8 @@ _mailbox_maildir_init (mu_mailbox_t mailbox)
   amd->message_uid = maildir_message_uid;
   amd->next_uid = maildir_next_uid;
   amd->remove = maildir_remove;
+  amd->chattr_msg = maildir_chattr_msg;
+  amd->capabilities = MU_AMD_STATUS;
   
   /* Set our properties.  */
   {

@@ -121,11 +121,9 @@ _mh_is_scheme (mu_record_t record, mu_url_t url, int flags)
 static int
 _mh_list_p (mu_record_t record, const char *name, int flags MU_ARG_UNUSED)
 {
-  int len;
-  
-  if (strcmp (name, MU_AMD_SIZE_FILE_NAME) == 0
-      || name[0] == ','
-      || (((len = strlen (name)) > 3) && memcmp (name, ".mh", 3) == 0))
+  if (name[0] == ',' ||
+      ((strlen (name) > 3) &&
+       (memcmp (name, ".mh", 3) == 0 || memcmp (name, ".mu", 3) == 0)))
     return 0;
 
   for (; *name; name++)

@@ -278,22 +278,6 @@ mh_scan0 (mu_mailbox_t mailbox, size_t msgno MU_ARG_UNUSED, size_t *pcount,
 
       if (pcount)
 	*pcount = amd->msg_count;
-
-      /* Reset the uidvalidity.  */
-      if (amd->msg_count > 0)
-	{
-	  if (amd->uidvalidity == 0)
-	    {
-	      amd->uidvalidity = (unsigned long)time (NULL);
-	      /* Tell that we have been modified for expunging.  */
-	      if (amd->msg_count)
-		{
-		  amd_message_stream_open (amd->msg_array[0]);
-		  amd_message_stream_close (amd->msg_array[0]);
-		  amd->msg_array[0]->attr_flags |= MU_ATTRIBUTE_MODIFIED;
-		}
-	    }
-	}
     }
   /* Clean up the things */
 

@@ -87,7 +87,7 @@ do
   mv Mail/inbox/$i Mail/inbox/${i}0
 done
 folder -pack || exit $?
-find Mail/inbox | sort
+find Mail/inbox -not -name '.mu-prop' | sort
 ],
 [0],
 [Mail/inbox
@@ -105,7 +105,7 @@ do
   mv Mail/inbox/$i Mail/inbox/${i}0
 done
 folder --pack=1 || exit $?
-find Mail/inbox | sort
+find Mail/inbox -not -name '.mu-prop' | sort
 ],
 [0],
 [Mail/inbox