From 59abbab62e936a46ceea7bb7ebac5ca9ef4ba2da Mon Sep 17 00:00:00 2001 From: Jesse Luehrs Date: Sat, 8 Jun 2019 18:11:38 -0400 Subject: basic readline implementation --- .rustfmt.toml | 1 + Cargo.lock | 847 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 4 + src/main.rs | 7 +- src/readline.rs | 169 +++++++++++ src/repl.rs | 53 ++++ 6 files changed, 1080 insertions(+), 1 deletion(-) create mode 100644 .rustfmt.toml create mode 100644 Cargo.lock create mode 100644 src/readline.rs create mode 100644 src/repl.rs diff --git a/.rustfmt.toml b/.rustfmt.toml new file mode 100644 index 0000000..bcad605 --- /dev/null +++ b/.rustfmt.toml @@ -0,0 +1 @@ +max_width = 78 diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..2309b4c --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,847 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "arc-swap" +version = "0.3.11" +source = 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+ +pub struct Readline { + reader: Option, + buffer: String, + prompt: String, + wrote_prompt: bool, + echo: bool, +} + +impl Readline { + fn process_event( + &mut self, + event: crossterm::InputEvent, + ) -> std::result::Result, Error> { + match event { + crossterm::InputEvent::Keyboard(e) => { + return self.process_keyboard_event(e) + } + _ => {} + } + return Ok(futures::Async::NotReady); + } + + fn process_keyboard_event( + &mut self, + event: crossterm::KeyEvent, + ) -> std::result::Result, Error> { + match event { + crossterm::KeyEvent::Char(c) => { + self.echo(c).map_err(|e| Error::IOError(e))?; + + if c == '\n' { + return Ok(futures::Async::Ready(self.buffer.clone())); + } + self.buffer.push(c); + } + crossterm::KeyEvent::Ctrl(c) => { + if c == 'd' { + if self.buffer.is_empty() { + self.echo('\n').map_err(|e| Error::IOError(e))?; + return Err(Error::EOF); + } + } + if c == 'c' { + self.buffer = String::new(); + self.echo('\n').map_err(|e| Error::IOError(e))?; + self.prompt().map_err(|e| Error::IOError(e))?; + } + } + _ => {} + } + return Ok(futures::Async::NotReady); + } + + fn write(&self, buf: &[u8]) -> std::io::Result<()> { + let stdout = std::io::stdout(); + let mut stdout = stdout.lock(); + stdout.write(buf)?; + stdout.flush() + } + + fn prompt(&self) -> std::io::Result<()> { + self.write(self.prompt.as_bytes()) + } + + fn echo(&self, c: char) -> std::io::Result<()> { + if c == '\n' { + self.write(b"\r\n")?; + return Ok(()); + } + + if !self.echo { + return Ok(()); + } + + let mut buf = [0u8; 4]; + self.write(c.encode_utf8(&mut buf[..]).as_bytes()) + } +} + +impl futures::future::Future for Readline { + type Item = String; + type Error = Error; + + fn poll(&mut self) -> futures::Poll { + if !self.wrote_prompt { + self.prompt().map_err(|e| Error::IOError(e))?; + self.wrote_prompt = true; + } + + let reader = self.reader.get_or_insert_with(|| { + KeyReader::new(tokio::prelude::task::current()) + }); + if let Some(event) = reader.poll() { + self.process_event(event) + } else { + Ok(futures::Async::NotReady) + } + } +} + +pub fn readline(prompt: &str, echo: bool) -> Readline { + Readline { + reader: None, + buffer: String::new(), + prompt: prompt.to_string(), + wrote_prompt: false, + echo, + } +} + +struct KeyReader { + events: std::sync::mpsc::Receiver, + quit: std::sync::mpsc::Sender<()>, +} + +impl KeyReader { + fn new(task: tokio::prelude::task::Task) -> Self { + let reader = crossterm::input().read_sync(); + let (events_tx, events_rx) = std::sync::mpsc::channel(); + let (quit_tx, quit_rx) = std::sync::mpsc::channel(); + std::thread::spawn(move || { + for event in reader { + let newline = event + == crossterm::InputEvent::Keyboard( + crossterm::KeyEvent::Char('\n'), + ); + events_tx.send(event).unwrap(); + task.notify(); + if newline { + break; + } + if let Ok(_) = quit_rx.try_recv() { + break; + } + } + }); + + KeyReader { + events: events_rx, + quit: quit_tx, + } + } + + fn poll(&self) -> Option { + if let Ok(event) = self.events.try_recv() { + return Some(event); + } + None + } +} + +impl Drop for KeyReader { + fn drop(&mut self) { + // don't care if it fails to send, this can happen if the thread + // terminates due to seeing a newline before the keyreader goes out of + // scope + match self.quit.send(()) { + _ => {} + } + } +} diff --git a/src/repl.rs b/src/repl.rs new file mode 100644 index 0000000..c44174a --- /dev/null +++ b/src/repl.rs @@ -0,0 +1,53 @@ +use futures::future::Future; +use std::io::Write; + +#[derive(Debug)] +enum Error { + ReadError(crate::readline::Error), + // EvalError(std::io::Error), + PrintError(std::io::Error), + // LoopError, +} + +pub fn repl() { + tokio::run(tokio::prelude::future::lazy(|| { + let mut done = false; + while !done { + let res = read() + .and_then(move |line| eval(&line)) + .and_then(move |out| print(&out)) + .wait(); + match res { + Ok(_) => {} + Err(Error::ReadError(crate::readline::Error::EOF)) => { + done = true; + } + Err(e) => { + let stderr = std::io::stderr(); + let mut stderr = stderr.lock(); + write!(stderr, "error: {:?}", e).unwrap(); + stderr.flush().unwrap(); + done = true; + } + } + } + futures::future::ok(()) + })); +} + +fn read() -> impl futures::future::Future { + crate::readline::readline("$ ", true).map_err(|e| Error::ReadError(e)) +} + +fn eval(line: &str) -> Result { + Ok(format!("got line '{}'\r\n", line)) +} + +fn print(out: &str) -> Result<(), Error> { + let stdout = std::io::stdout(); + let mut stdout = stdout.lock(); + stdout + .write(out.as_bytes()) + .map_err(|e| Error::PrintError(e))?; + stdout.flush().map_err(|e| Error::PrintError(e)) +} -- cgit v1.2.3-54-g00ecf