helix - Unnamed repository; edit this file 'description' to name the repository.


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Copyright (c) 2016 Max Brunsfeld
Copyright (c) 2023 Oliver Thomas

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
use helix_view::Editor;

use crate::compositor::Compositor;

use futures_util::future::{BoxFuture, Future, FutureExt};
use futures_util::stream::{FuturesUnordered, 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 {
    pub futures: FuturesUnordered<JobFuture>,
    /// These are the ones that need to complete before we exit.
    pub wait_futures: FuturesUnordered<JobFuture>,
}

impl Job {
    pub fn new<F: Future<Output = anyhow::Result<()>> + Send + 'static>(f: F) -> Self {
        Self {
            future: f.map(|r| r.map(|()| None)).boxed(),
            wait: false,
        }
    }

    pub fn with_callback<F: Future<Output = anyhow::Result<Callback>> + Send + 'static>(
        f: F,
    ) -> Self {
        Self {
            future: f.map(|r| r.map(Some)).boxed(),
            wait: false,
        }
    }

    pub fn wait_before_exiting(mut self) -> Self {
        self.wait = true;
        self
    }
}

impl Jobs {
    pub fn new() -> Self {
        Self::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(
        &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 async fn next_job(&mut self) -> Option<anyhow::Result<Option<Callback>>> {
        tokio::select! {
            event = self.futures.next() => {  event }
            event = self.wait_futures.next() => { event }
        }
    }

    pub fn add(&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 async fn finish(&mut self) -> anyhow::Result<()> {
        log::debug!("waiting on jobs...");
        let mut wait_futures = std::mem::take(&mut self.wait_futures);
        while let (Some(job), tail) = wait_futures.into_future().await {
            match job {
                Ok(_) => {
                    wait_futures = tail;
                }
                Err(e) => {
                    self.wait_futures = tail;
                    return Err(e);
                }
            }
        }

        Ok(())
    }
}