Add no_std support and update README

Cargo.toml

@@ -10,8 +10,8 @@ repository = "https://github.com/concoct-rs/concoct"
 full = ["tracing"]
 
 [dependencies]
-futures = "0.3.30"
-rustc-hash = "1.1.0"
+futures = { version = "0.3.30", default-features = false }
+hashbrown = { version = "0.14.3" }
 tracing = { version = "0.1.40", optional = true }
 
 [package.metadata.docs.rs]

README.md

@@ -15,50 +15,26 @@
  </a>
 </div>
 
-<div align="center">
- <a href="https://github.com/concoct-rs/concoct/tree/main/web_examples">Examples</a>
-</div>
-
 <br />
 
-Concoct is a framework for user-interfaces in Rust.
-
-This crate provides a virtual DOM and state management system for any backend.
-Concoct uses static typing to describe your UI at compile-time to create an efficient
-tree without allocations.
+Concoct is a reactive runtime for embedded systems.
 
 ```rust
-use concoct::{Scope, View};
-use concoct_web::html;
-
-#[derive(Default)]
-struct Counter {
- count: i32,
-}
+use concoct::{
+ task::{self, Task},
+ System,
+};
 
-impl View<Self> for Counter {
- fn body(&mut self, _cx: &Scope<Self>) -> impl View<Self> {
- (
- format!("High five count: {}", self.count),
- html::button("Up high!").on_click(|_cx, state: &mut Self, _event| state.count += 1),
- html::button("Down low!").on_click(|_cx, state: &mut Self, _event| state.count -= 1),
- )
- }
+fn app(_count: &mut i32) -> impl Task<i32> {
+ task::from_fn(|_| dbg!("Hello World!"))
 }
 
 fn main() {
- concoct_web::launch(Counter::default())
+ let mut system = System::new(0, app);
+ system.build();
+ system.rebuild();
 }
 ```
 
-## Installation
-The easiest way to get started is using the `full` feature flag.
-
-```
-cargo add concoct --features full
-```
-
-To see a list of the available features flags that can be enabled, check our [docs](https://docs.rs/concoct/latest/concoct/#feature-flags).
-
 ## Inspiration
-This crate is inspired by [xilem](https://github.com/linebender/xilem), React, and SwiftUI.
+This crate is inspired by [xilem](https://github.com/linebender/xilem), [Drake](https://drake.mit.edu) and [ArduPilot](https://ardupilot.org).

src/lib.rs

@@ -1,9 +1,13 @@
-use std::{
+#![no_std]
+
+extern crate alloc;
+
+use alloc::{collections::VecDeque, rc::Rc};
+use core::{
  cell::RefCell,
- collections::{HashMap, VecDeque},
- rc::Rc,
- task::Waker,
+ task::{Poll, Waker},
 };
+use hashbrown::HashMap;
 use task::{Scope, Task};
 
 pub mod task;
@@ -75,10 +79,10 @@ impl<M: 'static, F, S> System<M, F, S> {
  is_ready = true;
  }
  if is_ready {
- std::task::Poll::Ready(())
+ Poll::Ready(())
  } else {
  queue.waker = Some(cx.waker().clone());
- std::task::Poll::Pending
+ Poll::Pending
  }
  })
  .await

src/task/context.rs

@@ -1,5 +1,6 @@
 use super::Task;
-use std::{any::TypeId, marker::PhantomData, rc::Rc};
+use alloc::rc::Rc;
+use core::{any::TypeId, marker::PhantomData};
 
 pub fn context<T: 'static>() -> Context<T> {
  Context {

src/task/from_fn.rs

@@ -1,5 +1,5 @@
 use super::Task;
-use std::marker::PhantomData;
+use core::marker::PhantomData;
 
 pub fn from_fn<F, M, O>(f: F) -> FromFn<F, M>
 where

src/task/mod.rs

@@ -1,7 +1,7 @@
-use std::any::{Any, TypeId};
-use std::cell::RefCell;
-use std::collections::HashMap;
-use std::rc::Rc;
+use alloc::rc::Rc;
+use core::any::{Any, TypeId};
+use core::cell::RefCell;
+use hashbrown::HashMap;
 
 mod context;
 pub use self::context::{context, Context};

src/task/provider.rs

@@ -1,5 +1,6 @@
 use super::Task;
-use std::{any::TypeId, rc::Rc};
+use alloc::rc::Rc;
+use core::any::TypeId;
 
 pub fn provider<T: 'static>(value: T) -> Provider<T> {
  Provider {

src/task/then.rs

@@ -1,5 +1,5 @@
 use super::{Scope, Task};
-use std::marker::PhantomData;
+use core::marker::PhantomData;
 
 pub struct Then<T1, F, T2, M> {
  task: T1,