7 files changed, 66 insertions, 4 deletions
diff --git a/futures/Cargo.toml b/futures/Cargo.toml
new file mode 100644
index 00000000..fe0d378c
--- /dev/null
+++ b/futures/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "iced_futures"
+version = "0.1.0-alpha"
+authors = ["Héctor Ramón Jiménez <hector0193@gmail.com>"]
+edition = "2018"
+description = "Commands, subscriptions, and runtimes for Iced"
+license = "MIT"
+repository = "https://github.com/hecrj/iced"
+documentation = "https://docs.rs/iced_futures"
+keywords = ["gui", "ui", "graphics", "interface", "futures"]
+categories = ["gui"]
+
+[dependencies]
+log = "0.4"
+
+[dependencies.futures]
+version = "0.3"
+features = ["thread-pool"]
+
+[dependencies.tokio]
+version = "0.2"
+optional = true
+features = ["rt-core"]
diff --git a/core/src/command.rs b/futures/src/command.rs
index e7885fb8..e7885fb8 100644
--- a/core/src/command.rs
+++ b/futures/src/command.rs
diff --git a/futures/src/lib.rs b/futures/src/lib.rs
new file mode 100644
index 00000000..f6bcf85a
--- /dev/null
+++ b/futures/src/lib.rs
@@ -0,0 +1,8 @@
+mod command;
+
+pub mod runtime;
+pub mod subscription;
+
+pub use command::Command;
+pub use runtime::Runtime;
+pub use subscription::Subscription;
diff --git a/core/src/runtime.rs b/futures/src/runtime.rs
index 31234d11..bc1ad8ac 100644
--- a/core/src/runtime.rs
+++ b/futures/src/runtime.rs
@@ -1,3 +1,4 @@
+//! Run commands and subscriptions.
 mod executor;
 
 pub use executor::Executor;
@@ -10,8 +11,8 @@ use std::marker::PhantomData;
 #[derive(Debug)]
 pub struct Runtime<Hasher, Event, Executor, Receiver, Message> {
     executor: Executor,
-    subscriptions: subscription::Tracker<Hasher, Event>,
     receiver: Receiver,
+    subscriptions: subscription::Tracker<Hasher, Event>,
     _message: PhantomData<Message>,
 }
 
@@ -28,15 +29,19 @@ where
         + 'static,
     Message: Send + 'static,
 {
-    pub fn new(receiver: Receiver) -> Self {
+    pub fn new(executor: Executor, receiver: Receiver) -> Self {
         Self {
-            executor: Executor::new(),
-            subscriptions: subscription::Tracker::new(),
+            executor,
             receiver,
+            subscriptions: subscription::Tracker::new(),
             _message: PhantomData,
         }
     }
 
+    pub fn enter<R>(&self, f: impl FnOnce() -> R) -> R {
+        self.executor.enter(f)
+    }
+
     pub fn spawn(&mut self, command: Command<Message>) {
         use futures::{FutureExt, SinkExt};
 
diff --git a/futures/src/runtime/executor.rs b/futures/src/runtime/executor.rs
new file mode 100644
index 00000000..855aa105
--- /dev/null
+++ b/futures/src/runtime/executor.rs
@@ -0,0 +1,26 @@
+use futures::Future;
+
+pub trait Executor {
+    fn spawn(&self, future: impl Future<Output = ()> + Send + 'static);
+
+    fn enter<R>(&self, f: impl FnOnce() -> R) -> R {
+        f()
+    }
+}
+
+impl Executor for futures::executor::ThreadPool {
+    fn spawn(&self, future: impl Future<Output = ()> + Send + 'static) {
+        self.spawn_ok(future);
+    }
+}
+
+#[cfg(feature = "tokio")]
+impl Executor for tokio::runtime::Runtime {
+    fn spawn(&self, future: impl Future<Output = ()> + Send + 'static) {
+        let _ = tokio::runtime::Runtime::spawn(self, future);
+    }
+
+    fn enter<R>(&self, f: impl FnOnce() -> R) -> R {
+        tokio::runtime::Runtime::enter(self, f)
+    }
+}
diff --git a/core/src/subscription.rs b/futures/src/subscription.rs
index 87e51e48..87e51e48 100644
--- a/core/src/subscription.rs
+++ b/futures/src/subscription.rs
diff --git a/core/src/subscription/tracker.rs b/futures/src/subscription/tracker.rs
index a942b619..a942b619 100644
--- a/core/src/subscription/tracker.rs
+++ b/futures/src/subscription/tracker.rs