140 lines
4 KiB
Rust
140 lines
4 KiB
Rust
use helix_view::Editor;
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use crate::compositor::Compositor;
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use futures_util::future::{BoxFuture, Future, FutureExt};
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use futures_util::stream::{FuturesUnordered, StreamExt};
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pub type EditorCompositorCallback = Box<dyn FnOnce(&mut Editor, &mut Compositor) + Send>;
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pub type EditorCallback = Box<dyn FnOnce(&mut Editor) + Send>;
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pub enum Callback {
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EditorCompositor(EditorCompositorCallback),
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Editor(EditorCallback),
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}
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pub type JobFuture = BoxFuture<'static, anyhow::Result<Option<Callback>>>;
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pub struct Job {
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pub future: BoxFuture<'static, anyhow::Result<Option<Callback>>>,
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/// Do we need to wait for this job to finish before exiting?
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pub wait: bool,
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}
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#[derive(Default)]
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pub struct Jobs {
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pub futures: FuturesUnordered<JobFuture>,
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/// These are the ones that need to complete before we exit.
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pub wait_futures: FuturesUnordered<JobFuture>,
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}
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impl Job {
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pub fn new<F: Future<Output = anyhow::Result<()>> + Send + 'static>(f: F) -> Self {
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Self {
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future: f.map(|r| r.map(|()| None)).boxed(),
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wait: false,
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}
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}
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pub fn with_callback<F: Future<Output = anyhow::Result<Callback>> + Send + 'static>(
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f: F,
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) -> Self {
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Self {
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future: f.map(|r| r.map(Some)).boxed(),
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wait: false,
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}
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}
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pub fn wait_before_exiting(mut self) -> Self {
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self.wait = true;
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self
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}
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}
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impl Jobs {
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pub fn new() -> Self {
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Self::default()
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}
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pub fn spawn<F: Future<Output = anyhow::Result<()>> + Send + 'static>(&mut self, f: F) {
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self.add(Job::new(f));
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}
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pub fn callback<F: Future<Output = anyhow::Result<Callback>> + Send + 'static>(
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&mut self,
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f: F,
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) {
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self.add(Job::with_callback(f));
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}
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pub fn handle_callback(
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&self,
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editor: &mut Editor,
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compositor: &mut Compositor,
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call: anyhow::Result<Option<Callback>>,
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) {
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match call {
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Ok(None) => {}
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Ok(Some(call)) => match call {
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Callback::EditorCompositor(call) => call(editor, compositor),
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Callback::Editor(call) => call(editor),
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},
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Err(e) => {
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editor.set_error(format!("Async job failed: {}", e));
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}
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}
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}
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pub async fn next_job(&mut self) -> Option<anyhow::Result<Option<Callback>>> {
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tokio::select! {
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event = self.futures.next() => { event }
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event = self.wait_futures.next() => { event }
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}
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}
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pub fn add(&self, j: Job) {
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if j.wait {
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self.wait_futures.push(j.future);
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} else {
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self.futures.push(j.future);
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}
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}
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/// Blocks until all the jobs that need to be waited on are done.
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pub async fn finish(
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&mut self,
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editor: &mut Editor,
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mut compositor: Option<&mut Compositor>,
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) -> anyhow::Result<()> {
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log::debug!("waiting on jobs...");
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let mut wait_futures = std::mem::take(&mut self.wait_futures);
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while let (Some(job), tail) = wait_futures.into_future().await {
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match job {
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Ok(callback) => {
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wait_futures = tail;
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if let Some(callback) = callback {
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// clippy doesn't realize this is an error without the derefs
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#[allow(clippy::needless_option_as_deref)]
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match callback {
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Callback::EditorCompositor(call) if compositor.is_some() => {
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call(editor, compositor.as_deref_mut().unwrap())
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}
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Callback::Editor(call) => call(editor),
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// skip callbacks for which we don't have the necessary references
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_ => (),
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}
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}
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}
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Err(e) => {
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self.wait_futures = tail;
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return Err(e);
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}
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}
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}
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Ok(())
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}
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}
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