fix: draw TUI to /dev/tty instead of stdout for subshell compat

rust/ais/src/main.rs

@@ -4,7 +4,7 @@
 
 use std::collections::HashSet;
 use std::env;
-use std::io::{Read, Write, stdout, stdin};
+use std::io::{Read, Write, stdin};
 use std::process::Command;
 
 fn main() {
@@ -261,25 +261,37 @@ fn fuzzy_match(item: &str, query: &str) -> bool {
         .all(|w| lower.contains(&w.to_lowercase()))
 }
 
+fn open_tty() -> Option<std::fs::File> {
+    std::fs::OpenOptions::new()
+        .read(true)
+        .write(true)
+        .open("/dev/tty")
+        .ok()
+}
+
 fn fuzzy_select(items: &[String], label: &str) -> Option<String> {
+    let mut tty = match open_tty() {
+        Some(f) => f,
+        None => return None,
+    };
     let mut query = String::new();
     let mut cursor: usize = 0;
 
-    // save terminal state and enter raw mode
+    // save terminal state and enter raw mode via /dev/tty
     let _ = Command::new("stty")
         .args(["-echo", "raw"])
-        .stdin(std::process::Stdio::inherit())
+        .stdin(std::process::Stdio::from(tty.try_clone().unwrap()))
         .status();
 
-    let result = run_select_loop(items, label, &mut query, &mut cursor);
+    let result = run_select_loop(items, label, &mut query, &mut cursor, &mut tty);
 
     // restore terminal
     let _ = Command::new("stty")
         .args(["echo", "-raw"])
-        .stdin(std::process::Stdio::inherit())
+        .stdin(std::process::Stdio::from(tty.try_clone().unwrap()))
         .status();
-    print!("\x1b[2J\x1b[H");
+    let _ = write!(tty, "\x1b[2J\x1b[H");
-    let _ = stdout().flush();
+    let _ = tty.flush();
 
     result
 }
@@ -289,6 +301,7 @@ fn run_select_loop(
     label: &str,
     query: &mut String,
     cursor: &mut usize,
+    tty: &mut std::fs::File,
 ) -> Option<String> {
     loop {
         let filtered: Vec<&String> = items.iter().filter(|i| fuzzy_match(i, query)).collect();
@@ -299,12 +312,11 @@ fn run_select_loop(
             *cursor = filtered.len() - 1;
         }
 
-        // draw
+        // draw to /dev/tty (not stdout, which may be captured by subshell)
-        let mut out = stdout();
+        let _ = write!(tty, "\x1b[2J\x1b[H");
-        let _ = write!(out, "\x1b[2J\x1b[H");
+        let _ = write!(tty, "\x1b[33m{}\x1b[0m> {}\r\n", label, query);
-        let _ = write!(out, "\x1b[33m{}\x1b[0m> {}\r\n", label, query);
         let _ = write!(
-            out,
+            tty,
             "\x1b[90m{} items\x1b[0m\r\n",
             filtered.len()
         );
@@ -312,25 +324,21 @@ fn run_select_loop(
         let max_show = 20;
         for (i, item) in filtered.iter().enumerate().take(max_show) {
             if i == *cursor {
-                let _ = write!(out, "\x1b[7m  {}\x1b[0m\r\n", item);
+                let _ = write!(tty, "\x1b[7m  {}\x1b[0m\r\n", item);
             } else {
-                let _ = write!(out, "  {}\r\n", item);
+                let _ = write!(tty, "  {}\r\n", item);
             }
         }
         if filtered.len() > max_show {
             let _ = write!(
-                out,
+                tty,
                 "  \x1b[90m+{} more\x1b[0m\r\n",
                 filtered.len() - max_show
             );
         }
-        let _ = out.flush();
+        let _ = tty.flush();
 
-        // read key from /dev/tty (works even when stdin is piped)
+        // read key from /dev/tty
-        let mut tty = match std::fs::File::open("/dev/tty") {
-            Ok(f) => f,
-            Err(_) => return None,
-        };
         let mut buf = [0u8; 3];
         let n = tty.read(&mut buf).unwrap_or(0);
         if n == 0 {