* crypto: implement automagic decryption when so requested

(mainly by adding some smartness to various part_foreach functions, adding
  mu_msg_(get|set)_auto_decrypt to mark a message for auto-decryption)

lib/mu-msg.h

@@ -38,18 +38,16 @@ enum _MuMsgOptions {
 /* 1 << 0 is still free! */
 
 	/* for -> sexp conversion */
-
 	MU_MSG_OPTION_HEADERS_ONLY      = 1 << 1,
 	MU_MSG_OPTION_EXTRACT_IMAGES    = 1 << 2,
 
-/* 1 << 3 is still free! */
-
 	/* below options are for checking signatures; only effective
 	 * if mu was built with crypto support */
 	MU_MSG_OPTION_CHECK_SIGNATURES  = 1 << 4,
 	MU_MSG_OPTION_AUTO_RETRIEVE_KEY = 1 << 5,
 	MU_MSG_OPTION_USE_AGENT         = 1 << 6,
 	MU_MSG_OPTION_USE_PKCS7         = 1 << 7   /* gpg is the default */
+
 };
 typedef enum _MuMsgOptions MuMsgOptions;
 
@@ -138,6 +136,28 @@ MuMsg *mu_msg_ref (MuMsg *msg);
 void mu_msg_unref (MuMsg *msg);
 
 
+/**
+ * should we set this message to 'autodecrypt'? if so, try to
+ * automatically decrypt encrypted message parts.
+ *
+ * @param msg a message
+ * @param autodecrypt TRUE or FALSE
+ *
+ * @return
+ */
+void     mu_msg_set_auto_decrypt (MuMsg *msg, gboolean autodecrypt);
+
+/**
+ * get the autodecrypt status for this message. See @func mu_msg_set_auto_decrypt
+ *
+ * @param msg a message
+ *
+ * @return the auto-decrypt status
+ */
+gboolean mu_msg_get_auto_decrypt (MuMsg *msg);
+
+
+
 
 /**
  * cache the values from the backend (file or db), so we don't the
@@ -566,6 +586,8 @@ typedef gboolean  (*MuMsgContactForeachFunc) (MuMsgContact* contact,
 void mu_msg_contact_foreach (MuMsg *msg, MuMsgContactForeachFunc func,
 			     gpointer user_data);
 
+
+
 G_END_DECLS
 
 #endif /*__MU_MSG_H__*/