1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
use crate::prelude::*;
#[derive(Debug)]
pub enum Event {
Key(textmode::Key),
Resize((u16, u16)),
PtyOutput,
ChildRunPipeline(usize, (usize, usize)),
ChildSuspend(usize),
ChildExit(usize, super::history::ExitInfo, Option<Env>),
GitInfo(Option<super::inputs::GitInfo>),
ClockTimer,
}
pub fn channel() -> (Writer, Reader) {
let (event_w, event_r) = tokio::sync::mpsc::unbounded_channel();
(Writer::new(event_w), Reader::new(event_r))
}
#[derive(Clone)]
pub struct Writer(tokio::sync::mpsc::UnboundedSender<Event>);
impl Writer {
pub fn new(event_w: tokio::sync::mpsc::UnboundedSender<Event>) -> Self {
Self(event_w)
}
pub fn send(&self, event: Event) {
// the only time this should ever error is when the application is
// shutting down, at which point we don't actually care about any
// further dropped messages
#[allow(clippy::let_underscore_drop)]
let _ = self.0.send(event);
}
}
pub struct Reader(std::sync::Arc<InnerReader>);
impl Reader {
pub fn new(
mut input: tokio::sync::mpsc::UnboundedReceiver<Event>,
) -> Self {
let inner = std::sync::Arc::new(InnerReader::new());
{
let inner = inner.clone();
tokio::spawn(async move {
while let Some(event) = input.recv().await {
inner.new_event(Some(event));
}
inner.new_event(None);
});
}
Self(inner)
}
pub async fn recv(&self) -> Option<Event> {
self.0.recv().await
}
}
struct InnerReader {
pending: std::sync::Mutex<Pending>,
cvar: tokio::sync::Notify,
}
impl InnerReader {
fn new() -> Self {
Self {
pending: std::sync::Mutex::new(Pending::new()),
cvar: tokio::sync::Notify::new(),
}
}
async fn recv(&self) -> Option<Event> {
loop {
if let Some(event) = self.pending.lock().unwrap().get_event() {
return event;
}
self.cvar.notified().await;
}
}
fn new_event(&self, event: Option<Event>) {
self.pending.lock().unwrap().new_event(event);
self.cvar.notify_one();
}
}
#[allow(clippy::option_option)]
#[derive(Default)]
struct Pending {
key: std::collections::VecDeque<textmode::Key>,
size: Option<(u16, u16)>,
pty_output: bool,
child_run_pipeline: std::collections::VecDeque<(usize, (usize, usize))>,
child_suspend: std::collections::VecDeque<usize>,
child_exit: Option<(usize, super::history::ExitInfo, Option<Env>)>,
git_info: Option<Option<super::inputs::GitInfo>>,
clock_timer: bool,
done: bool,
}
impl Pending {
fn new() -> Self {
Self::default()
}
fn get_event(&mut self) -> Option<Option<Event>> {
if self.done {
return Some(None);
}
if let Some(key) = self.key.pop_front() {
return Some(Some(Event::Key(key)));
}
if let Some(size) = self.size.take() {
return Some(Some(Event::Resize(size)));
}
if let Some((idx, span)) = self.child_run_pipeline.pop_front() {
return Some(Some(Event::ChildRunPipeline(idx, span)));
}
if let Some(idx) = self.child_suspend.pop_front() {
return Some(Some(Event::ChildSuspend(idx)));
}
if let Some((idx, exit_info, env)) = self.child_exit.take() {
return Some(Some(Event::ChildExit(idx, exit_info, env)));
}
if let Some(info) = self.git_info.take() {
return Some(Some(Event::GitInfo(info)));
}
if self.clock_timer {
self.clock_timer = false;
return Some(Some(Event::ClockTimer));
}
// process_output should be last because it will often be the case
// that there is ~always new process output (cat on large files, yes,
// etc) and that shouldn't prevent other events from happening
if self.pty_output {
self.pty_output = false;
return Some(Some(Event::PtyOutput));
}
None
}
fn new_event(&mut self, event: Option<Event>) {
match event {
Some(Event::Key(key)) => self.key.push_back(key),
Some(Event::Resize(size)) => self.size = Some(size),
Some(Event::PtyOutput) => self.pty_output = true,
Some(Event::ChildRunPipeline(idx, span)) => {
self.child_run_pipeline.push_back((idx, span));
}
Some(Event::ChildSuspend(idx)) => {
self.child_suspend.push_back(idx);
}
Some(Event::ChildExit(idx, exit_info, env)) => {
self.child_exit = Some((idx, exit_info, env));
}
Some(Event::GitInfo(info)) => self.git_info = Some(info),
Some(Event::ClockTimer) => self.clock_timer = true,
None => self.done = true,
}
}
}
|
