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use futures::future::{Future, IntoFuture};
use futures::stream::Stream;
use std::io::Write;
#[derive(Debug)]
enum Error {
ReadError(crate::readline::Error),
EvalError(crate::process::Error),
PrintError(std::io::Error),
}
pub fn repl() {
let loop_stream = futures::stream::unfold(false, |done| {
if done {
return None;
}
let repl = read().and_then(|line| {
eprint!("running '{}'\r\n", line);
eval(&line).fold(None, |acc, event| match event {
crate::process::ProcessEvent::Output(out) => {
match print(&out) {
Ok(()) => futures::future::ok(acc),
Err(e) => futures::future::err(e),
}
}
crate::process::ProcessEvent::Exit(status) => {
futures::future::ok(Some(status))
}
})
});
Some(repl.then(move |res| match res {
Ok(Some(status)) => {
eprint!("process exited with status {}\r\n", status);
return Ok((done, false));
}
Ok(None) => {
eprint!("process exited weirdly?\r\n");
return Ok((done, false));
}
Err(Error::ReadError(crate::readline::Error::EOF)) => {
return Ok((done, true));
}
Err(Error::EvalError(crate::process::Error::ParserError(
crate::parser::Error::CommandRequired,
))) => {
return Ok((done, false));
}
Err(e) => {
let stderr = std::io::stderr();
let mut stderr = stderr.lock();
write!(stderr, "error: {:?}\r\n", e).unwrap();
stderr.flush().unwrap();
return Ok((done, false));
}
}))
});
tokio::run(loop_stream.collect().map(|_| ()));
}
fn read() -> impl futures::future::Future<Item = String, Error = Error> {
crate::readline::readline("$ ", true).map_err(|e| Error::ReadError(e))
}
fn eval(
line: &str,
) -> impl futures::stream::Stream<Item = crate::process::ProcessEvent, Error = Error>
{
crate::process::spawn(line)
.into_future()
.flatten_stream()
.map_err(|e| Error::EvalError(e))
}
fn print(out: &[u8]) -> Result<(), Error> {
let stdout = std::io::stdout();
let mut stdout = stdout.lock();
stdout.write(out).map_err(|e| Error::PrintError(e))?;
stdout.flush().map_err(|e| Error::PrintError(e))
}
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