Close connection when an account is deleted

Added a __gc metamethod to take care of the finalization of active
connections by logging out, when an account is deleted, or at the end of
the configuration (for Lua 5.2).

src/account.lua

@@ -32,6 +32,7 @@ Account._mt.__call = function (self, arg)
 
     object._mt = {}
     object._mt.__index = object._attach_mailbox
+    object._mt.__gc = object._logout_user
     setmetatable(object, object._mt)
 
     object:_login_user()
@@ -60,6 +61,12 @@ function Account._login_user(self)
     end
 end
 
+function Account._logout_user(self)
+    if ifcore.logout(self._session) == nil then
+        error("logout request failed", 0)
+    end
+end
+
 
 function Account._attach_mailbox(self, mailbox)
     self[mailbox] = Mailbox(self, mailbox)

src/imapfilter.c

@@ -86,23 +86,18 @@ main(int argc, char *argv[])
 	}
 
 	get_pathmax();
-
 	open_debug();
-
 	create_homedir();
-
 	catch_signals();
-
 	open_log();
+	if (opts.config == NULL)
+		opts.config = get_filepath("config.lua");
 
 	buffer_init(&ibuf, INPUT_BUF);
 	buffer_init(&obuf, OUTPUT_BUF);
 	buffer_init(&nbuf, NAMESPACE_BUF);
 	buffer_init(&cbuf, CONVERSION_BUF);
 
-	if (opts.config == NULL)
-		opts.config = get_filepath("config.lua");
-
 	regexp_compile(responses);
 
 #ifndef NO_SSLTLS
@@ -111,7 +106,7 @@ main(int argc, char *argv[])
 #endif
 
 	start_lua();
-
+#if LUA_VERSION_NUM < 502
 	{
 		list *l;
 		session *s;
@@ -124,7 +119,7 @@ main(int argc, char *argv[])
 			request_logout(s);
 		}
 	}
-
+#endif
 	stop_lua();
 
 #ifndef NO_SSLTLS