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|
#[derive(Debug)]
pub enum Action {
Render,
ForceRedraw,
Run(String),
UpdateFocus(Focus),
UpdateScene(Scene),
CheckUpdateScene,
Resize((u16, u16)),
Quit,
}
#[derive(Copy, Clone, Debug)]
pub enum Focus {
Readline,
History(usize),
Scrolling(Option<usize>),
}
#[derive(Copy, Clone, Debug)]
pub enum Scene {
Readline,
Fullscreen,
}
pub struct Reader {
pending: async_std::sync::Mutex<Pending>,
cvar: async_std::sync::Condvar,
}
impl Reader {
pub fn new(
input: async_std::channel::Receiver<Action>,
) -> async_std::sync::Arc<Self> {
let this = std::sync::Arc::new(Self {
pending: async_std::sync::Mutex::new(Pending::new()),
cvar: async_std::sync::Condvar::new(),
});
{
let this = std::sync::Arc::clone(&this);
async_std::task::spawn(async move {
while let Ok(action) = input.recv().await {
this.new_action(Some(action)).await;
}
this.new_action(None).await;
});
}
this
}
pub async fn recv(&self) -> Option<Action> {
let mut pending = self
.cvar
.wait_until(self.pending.lock().await, |pending| {
pending.has_action()
})
.await;
pending.get_action()
}
async fn new_action(&self, action: Option<Action>) {
let mut pending = self.pending.lock().await;
pending.new_action(&action);
self.cvar.notify_one();
}
}
#[derive(Default)]
struct Pending {
render: Option<()>,
force_redraw: Option<()>,
run: std::collections::VecDeque<String>,
focus: Option<Focus>,
scene: Option<Scene>,
check_scene: Option<()>,
size: Option<(u16, u16)>,
done: bool,
}
impl Pending {
fn new() -> Self {
Self::default()
}
fn has_action(&self) -> bool {
self.done
|| self.render.is_some()
|| self.force_redraw.is_some()
|| !self.run.is_empty()
|| self.focus.is_some()
|| self.scene.is_some()
|| self.check_scene.is_some()
|| self.size.is_some()
}
fn get_action(&mut self) -> Option<Action> {
if self.size.is_some() {
return Some(Action::Resize(self.size.take().unwrap()));
}
if !self.run.is_empty() {
return Some(Action::Run(self.run.pop_front().unwrap()));
}
if self.focus.is_some() {
return Some(Action::UpdateFocus(self.focus.take().unwrap()));
}
if self.scene.is_some() {
return Some(Action::UpdateScene(self.scene.take().unwrap()));
}
if self.check_scene.take().is_some() {
return Some(Action::CheckUpdateScene);
}
if self.force_redraw.take().is_some() {
self.render.take();
return Some(Action::ForceRedraw);
}
if self.render.take().is_some() {
return Some(Action::Render);
}
if self.done {
return None;
}
unreachable!()
}
fn new_action(&mut self, action: &Option<Action>) {
match action {
Some(Action::Render) => self.render = Some(()),
Some(Action::ForceRedraw) => self.force_redraw = Some(()),
Some(Action::Run(cmd)) => self.run.push_back(cmd.to_string()),
Some(Action::UpdateFocus(focus)) => self.focus = Some(*focus),
Some(Action::UpdateScene(scene)) => self.scene = Some(*scene),
Some(Action::CheckUpdateScene) => self.check_scene = Some(()),
Some(Action::Resize(size)) => self.size = Some(*size),
Some(Action::Quit) | None => self.done = true,
}
}
}
|
