add state which is shared with the lua environment

1 files changed, 15 insertions, 1 deletions

diff --git a/src/sheet/mod.rs b/src/sheet/mod.rs
index f67d55e..501b71e 100644
--- a/src/sheet/mod.rs
+++ b/src/sheet/mod.rs
@@ -90,7 +90,7 @@ impl Clone for Sheet {
     }
 }
 
-struct SheetLuaRef {
+pub struct SheetLuaRef {
     id: SheetId,
 }
 
@@ -98,6 +98,10 @@ impl SheetLuaRef {
     pub fn new(id: SheetId) -> Self {
         Self { id }
     }
+
+    pub fn id(&self) -> SheetId {
+        self.id
+    }
 }
 
 impl LuaUserData for SheetLuaRef {
@@ -122,3 +126,13 @@ impl LuaUserData for SheetLuaRef {
         })
     }
 }
+
+impl<'lua> FromLua<'lua> for SheetLuaRef {
+    fn from_lua(value: LuaValue<'lua>, _: &'lua Lua) -> LuaResult<Self> {
+        if let Some(ud) = value.as_userdata() {
+            ud.take()
+        } else {
+            Err(LuaError::runtime("failed to parse sheet"))
+        }
+    }
+}