Make `Command` implementations platform-specific

This allows us to introduce a platform-specific `Action` to both `iced_native`
and `iced_web` and remove the `Clipboard` from `Application::update` to maintain
purity.

Additionally, this should let us implement further actions to let users query
and modify the shell environment (e.g. window, clipboard, and more!)

1 files changed, 18 insertions, 0 deletions

diff --git a/web/src/command/action.rs b/web/src/command/action.rs
new file mode 100644
index 00000000..cf384f07
--- /dev/null
+++ b/web/src/command/action.rs
@@ -0,0 +1,18 @@
+pub enum Action<T> {
+    Future(iced_futures::BoxFuture<T>),
+}
+
+impl<T> Action<T> {
+    /// Applies a transformation to the result of a [`Command`].
+    #[cfg(target_arch = "wasm32")]
+    pub fn map<A>(self, f: impl Fn(T) -> A + 'static) -> Action<A>
+    where
+        T: 'static,
+    {
+        use iced_futures::futures::FutureExt;
+
+        match self {
+            Self::Future(future) => Action::Future(Box::pin(future.map(f))),
+        }
+    }
+}