Breakdown features to smaller crates

Cargo.toml

@@ -26,17 +26,19 @@ members = [
 
 [features]
 default = ["lua53"]
-lua53 = []
-lua52 = []
+lua53 = ["futures-task", "futures-util"]
+lua52 = ["futures-task", "futures-util"]
 lua51 = []
 luajit = []
 vendored = ["lua-src", "luajit-src"]
 
 [dependencies]
-num-traits = { version = "0.2.11" }
 bstr = { version = "0.2", features = ["std"], default_features = false }
-futures = { version = "0.3.4" }
+futures-core = { version = "0.3.4" }
+futures-task = { version = "0.3.4", optional = true }
+futures-util = { version = "0.3.4", optional = true }
 lazy_static = { version = "1.4" }
+num-traits = { version = "0.2.11" }
 
 [build-dependencies]
 cc = { version = "1.0" }
@@ -48,6 +50,8 @@ luajit-src = { version = "210.0.0", optional = true }
 rustyline = "6.0"
 criterion = "0.3"
 trybuild = "1.0"
+futures-executor = "0.3.4"
+futures-util = "0.3.4"
 futures-timer = "3.0"
 
 [[bench]]

src/lua.rs

@@ -6,11 +6,16 @@ use std::marker::PhantomData;
 use std::os::raw::{c_char, c_int};
 use std::sync::{Arc, Mutex};
 use std::{mem, ptr, str};
+use std::task::Waker;
 
-#[allow(unused_imports)]
-use futures::{
-    future::{self, BoxFuture, Future, FutureExt, TryFutureExt},
-    task::{Context, Poll, Waker},
+use futures_core::future::BoxFuture;
+
+#[cfg(any(feature = "lua53", feature = "lua52"))]
+use {
+    futures_task::noop_waker,
+    futures_util::future::{self, FutureExt, TryFutureExt},
+    std::future::Future,
+    std::task::{Context, Poll},
 };
 
 use crate::error::{Error, Result};
@@ -492,7 +497,8 @@ impl Lua {
     ///
     /// ```
     /// use std::time::Duration;
-    /// use futures::{executor::block_on, pin_mut, stream::TryStreamExt};
+    /// use futures_executor::block_on;
+    /// use futures_util::{pin_mut, stream::TryStreamExt};
     /// use futures_timer::Delay;
     /// # use mlua::{Error, Lua, Result, Thread};
     ///
@@ -1209,7 +1215,7 @@ impl Lua {
                     _no_ref_unwind_safe: PhantomData,
                 };
 
-                let mut waker = futures::task::noop_waker();
+                let mut waker = noop_waker();
 
                 // Try to get an outer poll waker
                 ffi::lua_pushlightuserdata(

src/thread.rs

@@ -2,9 +2,9 @@ use std::cell::RefCell;
 use std::marker::PhantomData;
 use std::os::raw::{c_int, c_void};
 use std::pin::Pin;
+use std::task::{Context, Poll};
 
-use futures::stream::Stream;
-use futures::task::{Context, Poll};
+use futures_core::stream::Stream;
 
 use crate::error::{Error, Result};
 use crate::ffi;
@@ -169,8 +169,8 @@ impl Thread {
     ///
     /// ```
     /// # use mlua::{Error, Lua, Result, Thread};
-    /// use futures::executor::block_on;
-    /// use futures::stream::TryStreamExt;
+    /// use futures_executor::block_on;
+    /// use futures_util::stream::TryStreamExt;
     /// # fn main() -> Result<()> {
     /// # let lua = Lua::new();
     /// let thread: Thread = lua.load(r#"

src/types.rs

@@ -2,7 +2,7 @@ use std::os::raw::{c_int, c_void};
 use std::sync::{Arc, Mutex};
 use std::{fmt, mem, ptr};
 
-use futures::future::BoxFuture;
+use futures_core::future::BoxFuture;
 
 use crate::error::Result;
 use crate::ffi;

tests/function.rs

@@ -2,7 +2,8 @@
 
 use std::{string::String as StdString, time::Duration};
 
-use futures::{executor::block_on, pin_mut, stream::TryStreamExt};
+use futures_executor::block_on;
+use futures_util::{pin_mut, stream::TryStreamExt};
 
 use mlua::{Error, Function, Lua, Result, String, Thread};
 

tests/thread.rs

@@ -4,7 +4,8 @@ use std::panic::catch_unwind;
 use std::sync::Arc;
 use std::time::Duration;
 
-use futures::{executor::block_on, pin_mut, stream::TryStreamExt};
+use futures_executor::block_on;
+use futures_util::{pin_mut, stream::TryStreamExt};
 
 use mlua::{Error, Function, Lua, Result, Thread, ThreadStatus};