Use C functions for the backstack, instead of a lua module

Working with the default group and root kinda sucks if you have to do it
from lua!

1 files changed, 13 insertions, 0 deletions

diff --git a/src/lua/stubs/backstack.lua b/src/lua/stubs/backstack.lua
new file mode 100644
index 00000000..d4807d37
--- /dev/null
+++ b/src/lua/stubs/backstack.lua
@@ -0,0 +1,13 @@
+--- Module for adding and removing screens from the system's backstack.
+-- @module backstack
+
+local backstack = {}
+
+--- Pushes a new screen onto the backstack.
+-- @tparam function constructor Called to create the UI for the new screen. A new default root object and group will be set before calling this function. The function provided should return a table holding any bindings used by this screen; the returned value is retained so long as this screen is present in the backstack.
+function backstack.push(constructor) end
+
+--- Removes the currently active screen, and instead shows the screen underneath it on the backstack. Does nothing if this is the only existing screen.
+function backstack.pop() end
+
+return backstack