* mu-msg.[ch]: add mu_msg_is_readable

src/mu-msg.c

@@ -671,6 +671,17 @@ mu_msg_cmp (MuMsg *m1, MuMsg *m2, MuMsgFieldId mfid)
 }
 
 
+gboolean
+mu_msg_is_readable (MuMsg *self)
+{
+	g_return_val_if_fail (self, FALSE);
+	
+	return (access (get_str_field (self, MU_MSG_FIELD_ID_PATH), R_OK)
+		== 0) ? TRUE : FALSE;
+}
+
+
+
 
 
 enum _MaildirType {

src/mu-msg.h

@@ -358,6 +358,16 @@ int mu_msg_cmp (MuMsg *m1, MuMsg *m2, MuMsgFieldId mfid);
 
 
 
+/**
+ * check whether there there's a readable file behind this message 
+ * 
+ * @param self a MuMsg*
+ * 
+ * @return TRUE if the message file is readable, FALSE otherwise
+ */
+gboolean mu_msg_is_readable (MuMsg *self);
+
+
 /**
  * convert the msg to a Lisp symbolic expression (for further processing in
  * e.g. emacs)