scheduler code cleanup

src/scheduler.rs

@@ -61,8 +61,8 @@ pub fn scheduler_mut<T>(lua:&mlua::Lua,mut f:impl FnMut(&mut crate::scheduler::S
 	let mut scheduler=lua.app_data_mut::<crate::scheduler::Scheduler>().ok_or(mlua::Error::runtime("Scheduler missing"))?;
 	f(&mut *scheduler)
 }
-pub fn set_globals(lua:&mlua::Lua,globals:&mlua::Table)->Result<(),mlua::Error>{
-	let schedule_thread=lua.create_function(|lua,dt:mlua::Value|{
+
+fn schedule_thread(lua:&mlua::Lua,dt:mlua::Value)->Result<(),mlua::Error>{
 	let delay=match dt{
 		mlua::Value::Integer(i)=>i.max(0) as u64*60,
 		mlua::Value::Number(f)=>{
@@ -85,21 +85,32 @@ pub fn set_globals(lua:&mlua::Lua,globals:&mlua::Table)->Result<(),mlua::Error>{
 		scheduler.schedule_thread(delay.max(2),lua.current_thread());
 		Ok(())
 	})
-	})?;
-	let wait_env=lua.create_table()?;
-	wait_env.raw_set("coroutine",globals.get::<mlua::Table>("coroutine")?)?;
-	wait_env.raw_set("schedule_thread",schedule_thread)?;
-	let wait=lua.load("
-		local coroutine_yield=coroutine.yield
+}
+
+// This is used to avoid calling coroutine.yield from the rust side.
+const LUA_WAIT:&str=
+"local coroutine_yield=coroutine.yield
 local schedule_thread=schedule_thread
 return function(dt)
 	schedule_thread(dt)
 	return coroutine_yield()
-		end
-	")
+end";
+
+pub fn set_globals(lua:&mlua::Lua,globals:&mlua::Table)->Result<(),mlua::Error>{
+	let coroutine_table=globals.get::<mlua::Table>("coroutine")?;
+	let schedule_thread=lua.create_function(schedule_thread)?;
+
+	//create wait function environment
+	let wait_env=lua.create_table()?;
+	wait_env.raw_set("coroutine",coroutine_table)?;
+	wait_env.raw_set("schedule_thread",schedule_thread)?;
+
+	//construct wait function from Lua code
+	let wait=lua.load(LUA_WAIT)
 	.set_name("wait")
 	.set_environment(wait_env)
 	.call::<mlua::Function>(())?;
+
 	globals.raw_set("wait",wait)?;
 
 	Ok(())