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vertex

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sequence

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parking_lot_core

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percent_encoding

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pin_project_lite

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ppv_lite86

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proc_macro2

detection.rs fallback.rs lib.rs marker.rs parse.rs wrapper.rs

proc_macro_hack

error.rs iter.rs lib.rs parse.rs quote.rs

proc_macro_nested

quote

ext.rs format.rs ident_fragment.rs lib.rs runtime.rs spanned.rs to_tokens.rs

rand

rand_chacha

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raw_window_handle

read_color

relevant

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collect.rs lib.rs node.rs resource.rs sync.rs

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family

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rendy_core

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cirque

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graph

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mapping

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serde_json

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slab

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keyboard

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pointer

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shell

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utils

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window

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smithay_clipboard

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spirv_headers

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thiserror_impl

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thread_profiler

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tracing

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pipeline_layout

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descriptor.rs mod.rs

device

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attachments_list.rs compat_atch.rs desc.rs empty.rs framebuffer.rs macros.rs mod.rs sys.rs traits.rs

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instance

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memory

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host_visible.rs mod.rs non_host_visible.rs pool.rs

device_memory.rs mod.rs

pipeline

query

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capabilities.rs display.rs mod.rs present_region.rs surface.rs swapchain.rs

sync

future

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event.rs fence.rs mod.rs pipeline.rs semaphore.rs

extensions.rs features.rs format.rs lib.rs sampler.rs version.rs

vulkano_shaders

codegen.rs descriptor_sets.rs entry_point.rs enums.rs lib.rs parse.rs spec_consts.rs spirv_search.rs structs.rs

walkdir

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wayland_client

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cursor.rs display.rs event_queue.rs globals.rs lib.rs proxy.rs sinks.rs

wayland_commons

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wayland_cursor

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util

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desktop.rs mod.rs unix.rs

platform_impl

linux

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event_loop

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seat

keyboard

handlers.rs keymap.rs mod.rs

pointer

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text_input

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touch

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window

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x11

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x11_clipboard

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x11_dl

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xcb

ffi

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lib.rs parser.rs

xdg

xml

use crate::future::TryFutureExt;
use core::iter::FromIterator;
use core::mem;
use core::pin::Pin;
use alloc::vec::Vec;
use futures_core::future::{Future, TryFuture};
use futures_core::task::{Context, Poll};

/// Future for the [`select_ok`] function.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct SelectOk<Fut> {
    inner: Vec<Fut>,
}

impl<Fut: Unpin> Unpin for SelectOk<Fut> {}

/// Creates a new future which will select the first successful future over a list of futures.
///
/// The returned future will wait for any future within `iter` to be ready and Ok. Unlike
/// `select_all`, this will only return the first successful completion, or the last
/// failure. This is useful in contexts where any success is desired and failures
/// are ignored, unless all the futures fail.
///
///  This function is only available when the `std` or `alloc` feature of this
/// library is activated, and it is activated by default.
///
/// # Panics
///
/// This function will panic if the iterator specified contains no items.
pub fn select_ok<I>(iter: I) -> SelectOk<I::Item>
    where I: IntoIterator,
          I::Item: TryFuture + Unpin,
{
    let ret = SelectOk {
        inner: iter.into_iter().collect()
    };
    assert!(!ret.inner.is_empty(), "iterator provided to select_ok was empty");
    ret
}

impl<Fut: TryFuture + Unpin> Future for SelectOk<Fut> {
    type Output = Result<(Fut::Ok, Vec<Fut>), Fut::Error>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        // loop until we've either exhausted all errors, a success was hit, or nothing is ready
        loop {
            let item = self.inner.iter_mut().enumerate().find_map(|(i, f)| {
                match f.try_poll_unpin(cx) {
                    Poll::Pending => None,
                    Poll::Ready(e) => Some((i, e)),
                }
            });
            match item {
                Some((idx, res)) => {
                    // always remove Ok or Err, if it's not the last Err continue looping
                    drop(self.inner.remove(idx));
                    match res {
                        Ok(e) => {
                            let rest = mem::replace(&mut self.inner, Vec::new());
                            return Poll::Ready(Ok((e, rest)))
                        }
                        Err(e) => {
                            if self.inner.is_empty() {
                                return Poll::Ready(Err(e))
                            }
                        }
                    }
                }
                None => {
                    // based on the filter above, nothing is ready, return
                    return Poll::Pending
                }
            }
        }
    }
}

impl<Fut: TryFuture + Unpin> FromIterator<Fut> for SelectOk<Fut> {
    fn from_iter<T: IntoIterator<Item = Fut>>(iter: T) -> Self {
        select_ok(iter)
    }
}