ezlua 0.5.4

Ergonomic, efficient and Zero-cost rust bindings to Lua5.4
Documentation 
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use crate::{luaapi::UnsafeLuaApi, state::State, value::Value};
use alloc::sync::Arc;

pub(crate) type ArcLuaInner = Arc<LuaInner>;

#[derive(Debug)]
pub struct Lua(ArcLuaInner);

impl core::ops::Deref for Lua {
    type Target = State;

    fn deref(&self) -> &Self::Target {
        &self.0 .0
    }
}

impl Lua {
    pub fn new() -> Self {
        let result = Self(LuaInner(unsafe { State::from_raw_state(State::new()) }).into());
        result
            .registry()
            .set(
                Value::light_userdata(result.main_state().to_pointer()),
                Value::light_userdata(Arc::as_ptr(&result.0)),
            )
            .expect("init luainner");
        result
    }

    pub fn with_open_libs() -> Self {
        let this = Self::new();
        this.open_libs();
        this
    }
}

#[derive(Debug)]
pub(crate) struct LuaInner(pub State);

impl Drop for LuaInner {
    fn drop(&mut self) {
        self.0.close();
    }
}

impl State {
    pub(crate) fn lua_inner(&self) -> ArcLuaInner {
        self.try_lua_inner().expect("main state pointer not set")
    }

    pub(crate) fn try_lua_inner(&self) -> Option<ArcLuaInner> {
        match self
            .registry()
            .get(Value::light_userdata(self.main_state().to_pointer()))
            .expect("get")
            .into_value()
        {
            Value::LightUserdata(p) => unsafe {
                Arc::increment_strong_count(p);
                Some(Arc::from_raw(p as *const LuaInner))
            },
            _ => None,
        }
    }
}