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//! Run asynchronous actions.
mod action;
pub use action::Action;
use iced_futures::MaybeSend;
use std::fmt;
use std::future::Future;
/// A set of asynchronous actions to be performed by some runtime.
pub struct Command<T>(iced_futures::Command<Action<T>>);
impl<T> Command<T> {
/// Creates an empty [`Command`].
///
/// In other words, a [`Command`] that does nothing.
pub const fn none() -> Self {
Self(iced_futures::Command::none())
}
/// Creates a [`Command`] that performs a single [`Action`].
pub const fn single(action: Action<T>) -> Self {
Self(iced_futures::Command::single(action))
}
/// Creates a [`Command`] that performs the action of the given future.
pub fn perform<A>(
future: impl Future<Output = T> + 'static + MaybeSend,
f: impl Fn(T) -> A + 'static + MaybeSend,
) -> Command<A> {
use iced_futures::futures::FutureExt;
Command::single(Action::Future(Box::pin(future.map(f))))
}
/// Creates a [`Command`] that performs the actions of all the given
/// commands.
///
/// Once this command is run, all the commands will be executed at once.
pub fn batch(commands: impl IntoIterator<Item = Command<T>>) -> Self {
Self(iced_futures::Command::batch(
commands.into_iter().map(|Command(command)| command),
))
}
/// Applies a transformation to the result of a [`Command`].
pub fn map<A>(
self,
f: impl Fn(T) -> A + 'static + MaybeSend + Sync + Clone,
) -> Command<A>
where
T: 'static,
{
let Command(command) = self;
Command(command.map(move |action| action.map(f.clone())))
}
/// Returns all of the actions of the [`Command`].
pub fn actions(self) -> Vec<Action<T>> {
let Command(command) = self;
command.actions()
}
}
impl<T> fmt::Debug for Command<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let Command(command) = self;
command.fmt(f)
}
}
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