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|
use async_std::io::{ReadExt as _, WriteExt as _};
use pty_process::Command as _;
use textmode::Textmode as _;
pub struct History {
entries: Vec<crate::util::Mutex<HistoryEntry>>,
action: async_std::channel::Sender<crate::action::Action>,
}
impl History {
pub fn new(
action: async_std::channel::Sender<crate::action::Action>,
) -> Self {
Self {
entries: vec![],
action,
}
}
pub async fn run(&mut self, cmd: &str) -> anyhow::Result<usize> {
let (exe, args) = parse_cmd(cmd);
let mut process = async_std::process::Command::new(&exe);
process.args(&args);
let child = process
.spawn_pty(Some(&pty_process::Size::new(24, 80)))
.unwrap();
let (input_w, input_r) = async_std::channel::unbounded();
let entry = crate::util::mutex(HistoryEntry::new(
cmd,
child.id().try_into().unwrap(),
input_w,
));
let task_entry = async_std::sync::Arc::clone(&entry);
let task_action = self.action.clone();
async_std::task::spawn(async move {
loop {
enum Res {
Read(Result<usize, std::io::Error>),
Write(Result<Vec<u8>, async_std::channel::RecvError>),
}
let mut buf = [0_u8; 4096];
let mut pty = child.pty();
let read = async { Res::Read(pty.read(&mut buf).await) };
let write = async { Res::Write(input_r.recv().await) };
match futures_lite::future::race(read, write).await {
Res::Read(res) => {
match res {
Ok(bytes) => {
task_entry
.lock_arc()
.await
.vt
.process(&buf[..bytes]);
}
Err(e) => {
if e.raw_os_error() != Some(libc::EIO) {
eprintln!("pty read failed: {:?}", e);
}
task_entry.lock_arc().await.running = false;
task_action
.send(crate::action::Action::UpdateFocus(
crate::state::Focus::Readline,
))
.await
.unwrap();
break;
}
}
task_action
.send(crate::action::Action::Render)
.await
.unwrap();
}
Res::Write(res) => match res {
Ok(bytes) => {
pty.write(&bytes).await.unwrap();
}
Err(e) => {
panic!(
"failed to read from input channel: {}",
e
);
}
},
}
}
});
self.entries.push(entry);
self.action
.send(crate::action::Action::UpdateFocus(
crate::state::Focus::History(self.entries.len() - 1),
))
.await
.unwrap();
Ok(self.entries.len() - 1)
}
pub async fn handle_key(
&mut self,
key: textmode::Key,
idx: usize,
) -> bool {
match key {
textmode::Key::Ctrl(b'c') => {
let pid = self.entries[idx].lock_arc().await.pid;
nix::sys::signal::kill(pid, nix::sys::signal::Signal::SIGINT)
.unwrap();
}
textmode::Key::Ctrl(b'z') => {
self.action
.send(crate::action::Action::UpdateFocus(
crate::state::Focus::Readline,
))
.await
.unwrap();
}
key => {
self.send_process_input(idx, &key.into_bytes())
.await
.unwrap();
}
}
false
}
pub async fn render(
&self,
out: &mut textmode::Output,
repl_lines: usize,
focus: Option<usize>,
) -> anyhow::Result<()> {
let mut used_lines = repl_lines;
let mut pos = None;
for (idx, entry) in self.entries.iter().enumerate().rev() {
let entry = entry.lock_arc().await;
let screen = entry.vt.screen();
let mut last_row = 0;
for (idx, row) in screen.rows(0, 80).enumerate() {
if !row.is_empty() {
last_row = idx + 1;
}
}
if focus == Some(idx) {
last_row = std::cmp::max(
last_row,
screen.cursor_position().0 as usize + 1,
);
}
used_lines += 1 + std::cmp::min(6, last_row);
if used_lines > 24 {
break;
}
if used_lines == 1 {
used_lines = 2;
pos = Some((23, 0));
}
out.move_to((24 - used_lines).try_into().unwrap(), 0);
out.write_str("$ ");
if entry.running {
out.set_bgcolor(vt100::Color::Rgb(16, 64, 16));
}
out.write_str(&entry.cmd);
out.reset_attributes();
if last_row > 5 {
out.write(b"\r\n");
out.set_bgcolor(textmode::color::RED);
out.write(b"...");
out.reset_attributes();
}
let mut end_pos = (0, 0);
for row in screen
.rows_formatted(0, 80)
.take(last_row)
.skip(last_row.saturating_sub(5))
{
out.write(b"\r\n");
out.write(&row);
end_pos = out.screen().cursor_position();
}
if pos.is_none() {
pos = Some(end_pos);
}
out.reset_attributes();
}
if let Some(pos) = pos {
out.move_to(pos.0, pos.1);
}
Ok(())
}
async fn send_process_input(
&self,
idx: usize,
input: &[u8],
) -> anyhow::Result<()> {
self.entries[idx]
.lock_arc()
.await
.input
.send(input.to_vec())
.await
.unwrap();
Ok(())
}
}
struct HistoryEntry {
cmd: String,
pid: nix::unistd::Pid,
vt: vt100::Parser,
input: async_std::channel::Sender<Vec<u8>>,
running: bool, // option end time
// start time
}
impl HistoryEntry {
fn new(
cmd: &str,
pid: i32,
input: async_std::channel::Sender<Vec<u8>>,
) -> Self {
Self {
cmd: cmd.into(),
pid: nix::unistd::Pid::from_raw(pid),
vt: vt100::Parser::new(24, 80, 0),
input,
running: true,
}
}
}
fn parse_cmd(full_cmd: &str) -> (String, Vec<String>) {
let mut parts = full_cmd.split(' ');
let cmd = parts.next().unwrap();
(
cmd.to_string(),
parts.map(std::string::ToString::to_string).collect(),
)
}
|
