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
|
#![warn(clippy::pedantic)]
#![warn(clippy::nursery)]
#![allow(clippy::missing_const_for_fn)]
#![allow(clippy::too_many_lines)]
#![allow(clippy::unused_self)]
mod action;
mod builtins;
mod format;
mod history;
mod parse;
mod readline;
mod state;
mod util;
use async_std::stream::StreamExt as _;
// the time crate is currently unable to get the local offset on unix due to
// soundness concerns, so we have to do it manually/:
//
// https://github.com/time-rs/time/issues/380
fn get_offset() -> time::UtcOffset {
let offset_str =
std::process::Command::new("date").args(&["+%:z"]).output();
if let Ok(offset_str) = offset_str {
let offset_str = String::from_utf8(offset_str.stdout).unwrap();
time::UtcOffset::parse(
offset_str.trim(),
&time::format_description::parse("[offset_hour]:[offset_minute]")
.unwrap(),
)
.unwrap_or(time::UtcOffset::UTC)
} else {
time::UtcOffset::UTC
}
}
async fn resize(
action_w: &async_std::channel::Sender<crate::action::Action>,
) {
let size = terminal_size::terminal_size().map_or(
(24, 80),
|(terminal_size::Width(w), terminal_size::Height(h))| (h, w),
);
action_w
.send(crate::action::Action::Resize(size))
.await
.unwrap();
}
async fn async_main() -> anyhow::Result<()> {
let mut input = textmode::Input::new().await?;
let mut output = textmode::Output::new().await?;
// avoid the guards getting stuck in a task that doesn't run to
// completion
let _input_guard = input.take_raw_guard();
let _output_guard = output.take_screen_guard();
let (action_w, action_r) = async_std::channel::unbounded();
let state = state::State::new(get_offset());
state.render(&mut output, true).await.unwrap();
let state = util::mutex(state);
{
let mut signals = signal_hook_async_std::Signals::new(&[
signal_hook::consts::signal::SIGWINCH,
])?;
let action_w = action_w.clone();
async_std::task::spawn(async move {
while signals.next().await.is_some() {
resize(&action_w).await;
}
});
}
resize(&action_w).await;
{
let state = async_std::sync::Arc::clone(&state);
let action_w = action_w.clone();
async_std::task::spawn(async move {
while let Some(key) = input.read_key().await.unwrap() {
if let Some(action) =
state.lock_arc().await.handle_key(key).await
{
action_w.send(action).await.unwrap();
}
}
});
}
// redraw the clock every second
{
let action_w = action_w.clone();
async_std::task::spawn(async move {
let first_sleep = 1_000_000_000_u64.saturating_sub(
time::OffsetDateTime::now_utc().nanosecond().into(),
);
async_std::task::sleep(std::time::Duration::from_nanos(
first_sleep,
))
.await;
let mut interval = async_std::stream::interval(
std::time::Duration::from_secs(1),
);
action_w.send(crate::action::Action::Render).await.unwrap();
while interval.next().await.is_some() {
action_w.send(crate::action::Action::Render).await.unwrap();
}
});
}
let action_reader = action::Reader::new(action_r);
while let Some(action) = action_reader.recv().await {
state
.lock_arc()
.await
.handle_action(action, &mut output, &action_w)
.await;
}
Ok(())
}
fn main() {
match async_std::task::block_on(async_main()) {
Ok(_) => (),
Err(e) => {
eprintln!("nbsh: {}", e);
std::process::exit(1);
}
};
}
|
