From 1c297c4f89fca61b72a290a46be66a0c99f1912d Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 3 Mar 2021 01:44:39 -0500
Subject: add interhack example

---
 Cargo.toml            |   2 +
 examples/interhack.rs | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 examples/interhack.rs

diff --git a/Cargo.toml b/Cargo.toml
index dad4339..a3e4446 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,9 @@ futures = { version = "0.3", optional = true }
 [dev-dependencies]
 async-std = { version = "1.9", features = ["unstable"] }
 async-executor = "1.4"
+regex = "1.4"
 smol = "1.2"
+term_size = "0.3"
 tokio = { version = "1.2", features = [ "rt-multi-thread", "macros", "io-std", "io-util" ] }
 
 [features]
diff --git a/examples/interhack.rs b/examples/interhack.rs
new file mode 100644
index 0000000..747c0c9
--- /dev/null
+++ b/examples/interhack.rs
@@ -0,0 +1,104 @@
+use pty_process::Command as _;
+use smol::io::{AsyncReadExt as _, AsyncWriteExt as _};
+use std::os::unix::process::ExitStatusExt as _;
+
+mod raw_guard;
+
+async fn run(
+    child: &pty_process::smol::Child,
+) -> std::result::Result<(), Box<dyn std::error::Error>> {
+    let _raw = raw_guard::RawGuard::new();
+
+    let ex = smol::Executor::new();
+
+    let input = ex.spawn(async {
+        let mut buf = [0_u8; 4096];
+        let mut stdin = smol::Unblock::new(std::io::stdin());
+        loop {
+            match stdin.read(&mut buf).await {
+                Ok(bytes) => {
+                    // engrave Elbereth with ^E
+                    if buf[..bytes].contains(&5u8) {
+                        for byte in buf[..bytes].iter() {
+                            match byte {
+                                5u8 => child
+                                    .pty()
+                                    .write_all(b"E-  Elbereth\n")
+                                    .await
+                                    .unwrap(),
+                                _ => child
+                                    .pty()
+                                    .write_all(&[*byte])
+                                    .await
+                                    .unwrap(),
+                            }
+                        }
+                    } else {
+                        child.pty().write_all(&buf[..bytes]).await.unwrap();
+                    }
+                }
+                Err(e) => {
+                    eprintln!("stdin read failed: {:?}", e);
+                    break;
+                }
+            }
+        }
+    });
+    let output = ex.spawn(async {
+        let mut buf = [0_u8; 4096];
+        let mut stdout = smol::Unblock::new(std::io::stdout());
+        #[allow(clippy::trivial_regex)]
+        let re = regex::bytes::Regex::new("Elbereth").unwrap();
+        loop {
+            match child.pty().read(&mut buf).await {
+                Ok(bytes) => {
+                    // highlight successful Elbereths
+                    if re.is_match(&buf[..bytes]) {
+                        stdout
+                            .write_all(&re.replace_all(
+                                &buf[..bytes],
+                                &b"\x1b[35m$0\x1b[m"[..],
+                            ))
+                            .await
+                            .unwrap();
+                    } else {
+                        stdout.write_all(&buf[..bytes]).await.unwrap();
+                    }
+                    stdout.flush().await.unwrap();
+                }
+                Err(e) => {
+                    // EIO means that the process closed the other
+                    // end of the pty
+                    if e.raw_os_error() != Some(libc::EIO) {
+                        eprintln!("pty read failed: {:?}", e);
+                    }
+                    break;
+                }
+            }
+        }
+    });
+
+    ex.run(smol::future::or(input, output)).await;
+
+    Ok(())
+}
+
+fn main() {
+    let (w, h) = if let Some((w, h)) = term_size::dimensions() {
+        (w as u16, h as u16)
+    } else {
+        (80, 24)
+    };
+    let status = smol::block_on(async {
+        let mut child = smol::process::Command::new("nethack")
+            .spawn_pty(Some(&pty_process::Size::new(h, w)))
+            .unwrap();
+        run(&child).await.unwrap();
+        child.status().await.unwrap()
+    });
+    std::process::exit(
+        status
+            .code()
+            .unwrap_or_else(|| status.signal().unwrap_or(0) + 128),
+    );
+}
-- 
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