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use {EXIT_ERROR, Spawn};
use conch_parser::ast;
use error::RuntimeError;
use env::LastStatusEnvironment;
use future::{EnvFuture, Poll};
#[must_use = "futures do nothing unless polled"]
#[derive(Debug)]
pub struct Command<F> {
inner: Inner<F>,
}
#[must_use = "futures do nothing unless polled"]
#[derive(Debug)]
enum Inner<F> {
Pending(F),
Unimplemented,
}
impl<E: ?Sized, T> Spawn<E> for ast::Command<T>
where E: LastStatusEnvironment,
T: Spawn<E>,
T::Error: From<RuntimeError>,
{
type Error = T::Error;
type EnvFuture = Command<T::EnvFuture>;
type Future = T::Future;
fn spawn(self, env: &E) -> Self::EnvFuture {
let inner = match self {
ast::Command::Job(_) => Inner::Unimplemented,
ast::Command::List(cmd) => Inner::Pending(cmd.spawn(env)),
};
Command {
inner: inner,
}
}
}
impl<'a, E: ?Sized, T> Spawn<E> for &'a ast::Command<T>
where E: LastStatusEnvironment,
&'a T: Spawn<E>,
<&'a T as Spawn<E>>::Error: From<RuntimeError>,
{
type Error = <&'a T as Spawn<E>>::Error;
type EnvFuture = Command<<&'a T as Spawn<E>>::EnvFuture>;
type Future = <&'a T as Spawn<E>>::Future;
fn spawn(self, env: &E) -> Self::EnvFuture {
let inner = match *self {
ast::Command::Job(_) => Inner::Unimplemented,
ast::Command::List(ref cmd) => Inner::Pending(cmd.spawn(env)),
};
Command {
inner: inner,
}
}
}
impl<E: ?Sized, F> EnvFuture<E> for Command<F>
where F: EnvFuture<E>,
F::Error: From<RuntimeError>,
E: LastStatusEnvironment,
{
type Item = F::Item;
type Error = F::Error;
fn poll(&mut self, env: &mut E) -> Poll<Self::Item, Self::Error> {
match self.inner {
Inner::Pending(ref mut f) => f.poll(env),
Inner::Unimplemented => {
env.set_last_status(EXIT_ERROR);
Err(RuntimeError::Unimplemented("job control is not currently supported").into())
},
}
}
fn cancel(&mut self, env: &mut E) {
match self.inner {
Inner::Pending(ref mut f) => f.cancel(env),
Inner::Unimplemented => {},
}
}
}