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use helix_view::Editor;
use crate::compositor::Compositor;
use futures_util::future::{self, BoxFuture, Future, FutureExt};
use futures_util::stream::{self, FuturesUnordered, Select, StreamExt};
pub type Callback = Box<dyn FnOnce(&mut Editor, &mut Compositor) + Send>;
pub type JobFuture = BoxFuture<'static, anyhow::Result<Option<Callback>>>;
pub struct Job {
pub future: BoxFuture<'static, anyhow::Result<Option<Callback>>>,
/// Do we need to wait for this job to finish before exiting?
pub wait: bool,
}
#[derive(Default)]
pub struct Jobs {
futures: FuturesUnordered<JobFuture>,
/// These are the ones that need to complete before we exit.
wait_futures: FuturesUnordered<JobFuture>,
}
impl Job {
pub fn new<F: Future<Output = anyhow::Result<()>> + Send + 'static>(f: F) -> Job {
Job {
future: f.map(|r| r.map(|()| None)).boxed(),
wait: false,
}
}
pub fn with_callback<F: Future<Output = anyhow::Result<Callback>> + Send + 'static>(
f: F,
) -> Job {
Job {
future: f.map(|r| r.map(Some)).boxed(),
wait: false,
}
}
pub fn wait_before_exiting(mut self) -> Job {
self.wait = true;
self
}
}
impl Jobs {
pub fn new() -> Jobs {
Jobs::default()
}
pub fn spawn<F: Future<Output = anyhow::Result<()>> + Send + 'static>(&mut self, f: F) {
self.add(Job::new(f));
}
pub fn callback<F: Future<Output = anyhow::Result<Callback>> + Send + 'static>(
&mut self,
f: F,
) {
self.add(Job::with_callback(f));
}
pub fn handle_callback(
&mut self,
editor: &mut Editor,
compositor: &mut Compositor,
call: anyhow::Result<Option<Callback>>,
) {
match call {
Ok(None) => {}
Ok(Some(call)) => {
call(editor, compositor);
}
Err(e) => {
editor.set_error(format!("Async job failed: {}", e));
}
}
}
pub fn next_job(
&mut self,
) -> impl Future<Output = Option<anyhow::Result<Option<Callback>>>> + '_ {
future::select(self.futures.next(), self.wait_futures.next())
.map(|either| either.factor_first().0)
}
pub fn add(&mut self, j: Job) {
if j.wait {
self.wait_futures.push(j.future);
} else {
self.futures.push(j.future);
}
}
/// Blocks until all the jobs that need to be waited on are done.
pub fn finish(&mut self) {
let wait_futures = std::mem::take(&mut self.wait_futures);
helix_lsp::block_on(wait_futures.for_each(|_| future::ready(())));
}
}
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