Starts building a line editor

src/input.rs

@@ -1,34 +1,58 @@
-use std::io;
-use std::thread;
+use std::{mem, io, thread};
 use std::pin::Pin;
 use std::task::{Context, Poll};
 
-use linefeed::{Interface, ReadResult};
-use linefeed::memory::MemoryTerminal;
+use termion::event::Key;
+use termion::input::TermRead;
 
 use futures::Stream;
+use futures::ready;
 use futures::channel::mpsc;
 use futures::SinkExt;
 
 pub struct Inputs {
-    rx: mpsc::Receiver<String>,
+    rx: mpsc::Receiver<Key>,
     hndl: thread::JoinHandle<()>,
+    cmd_line: String,
 }
 
 impl Inputs {
-    pub fn new(term: MemoryTerminal) -> Self {
+    pub fn new() -> Self {
         let (mut tx, rx) = mpsc::channel(64);
 
         let hndl = thread::spawn(move || {
             let stdin = io::stdin();
-            let mut reader = Interface::with_term("sute", term).unwrap();
-            reader.set_prompt("> ").unwrap();
-            while let ReadResult::Input(line) = reader.read_line().unwrap() {
-                smol::block_on(tx.send(line));
+            let mut keys = stdin.keys();
+            for key in keys {
+                let key = key.unwrap();
+                smol::block_on(tx.send(key));
             }
         });
 
-        Self { rx, hndl }
+        Self {
+            rx: rx,
+            hndl: hndl,
+            cmd_line: String::new(),
+        }
+    }
+
+    pub fn get_line(&self) -> &str {
+        self.cmd_line.as_ref()
+    }
+
+    pub fn handle_key(&mut self, key: Key) -> Option<String> {
+        match key {
+            Key::Char('\n') => Some(mem::replace(&mut self.cmd_line, String::new())),
+            Key::Char(c) => {
+                self.cmd_line.push(c);
+                None
+            },
+            Key::Backspace => {
+                self.cmd_line.pop();
+                None
+            },
+            _ => None
+        }
     }
 }
 
@@ -36,6 +60,14 @@ impl Stream for Inputs {
     type Item = String;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
-        Pin::new(&mut self.rx).poll_next(cx)
+        if let Some(key) = ready!(Pin::new(&mut self.rx).poll_next(cx)) {
+            if let Some(line) = self.handle_key(key) {
+                Poll::Ready(Some(line))
+            } else {
+                Poll::Pending
+            }
+        } else {
+            Poll::Pending
+        }
     }
 }