From 21de97b23523aa365c929ce72a0fbeee7ba7b333 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jow@openwrt.org>
Date: Thu, 28 Oct 2010 17:26:48 +0000
Subject: [PATCH] libs/core: implement substate() in uci model for creating
 bound state cursors

---
 libs/core/luasrc/model/uci.lua | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/libs/core/luasrc/model/uci.lua b/libs/core/luasrc/model/uci.lua
index 66bd0a026..46b0db8d8 100644
--- a/libs/core/luasrc/model/uci.lua
+++ b/libs/core/luasrc/model/uci.lua
@@ -227,6 +227,32 @@ function Cursor._affected(self, configlist)
 	return reloadlist
 end
 
+--- Create a sub-state of this cursor. The sub-state is tied to the parent
+-- curser, means it the parent unloads or loads configs, the sub state will
+-- do so as well.
+-- @return			UCI state cursor tied to the parent cursor
+function Cursor.substate(self)
+	Cursor._substates = Cursor._substates or { }
+	Cursor._substates[self] = Cursor._substates[self] or cursor_state()
+	return Cursor._substates[self]
+end
+
+local _load = Cursor.load
+function Cursor.load(self, ...)
+	if Cursor._substates and Cursor._substates[self] then
+		_load(Cursor._substates[self], ...)
+	end
+	return _load(self, ...)
+end
+
+local _unload = Cursor.unload
+function Cursor.unload(self, ...)
+	if Cursor._substates and Cursor._substates[self] then
+		_unload(Cursor._substates[self], ...)
+	end
+	return _unload(self, ...)
+end
+
 
 --- Add an anonymous section.
 -- @class function
-- 
2.11.0