From e3b4b41247e1e32794c9f14149707333438782f7 Mon Sep 17 00:00:00 2001
From: oech3 <79379754+oech3@users.noreply.github.com>
Date: Wed, 29 Apr 2026 18:24:42 +0900
Subject: [PATCH] tty: Build tty.wasm

---
 .github/workflows/wasi.yml | 2 +-
 Cargo.toml                 | 1 +
 src/uu/tty/src/tty.rs      | 9 ++++++++-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/wasi.yml b/.github/workflows/wasi.yml
index 549e85dd0..8c3721d6a 100644
--- a/.github/workflows/wasi.yml
+++ b/.github/workflows/wasi.yml
@@ -37,7 +37,7 @@ jobs:
         CARGO_TARGET_WASM32_WASIP1_RUNNER: wasmtime
       run: |
         # Get all utilities and exclude ones that don't compile for wasm32-wasip1
-        EXCLUDE="dd|df|du|env|expr|mktemp|more|tac|test|tty"
+        EXCLUDE="dd|df|du|env|expr|mktemp|more|tac|test"
         UTILS=$(./util/show-utils.sh | tr ' ' '\n' | grep -vE "^($EXCLUDE)$" | sed 's/^/-p uu_/' | tr '\n' ' ')
         cargo test --target wasm32-wasip1 --no-default-features $UTILS
     - name: Run integration tests via wasmtime
diff --git a/Cargo.toml b/Cargo.toml
index 6a3307648..c27921add 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -235,6 +235,7 @@ feat_wasm = [
   "true",
   "truncate",
   "tsort",
+  "tty",
   "uname",
   "unexpand",
   "uniq",
diff --git a/src/uu/tty/src/tty.rs b/src/uu/tty/src/tty.rs
index 33c84804c..78b8d55ee 100644
--- a/src/uu/tty/src/tty.rs
+++ b/src/uu/tty/src/tty.rs
@@ -49,7 +49,14 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         set_exit_code(1);
         writeln!(stdout, "{}", translate!("tty-not-a-tty"))
     };
-
+    #[cfg(target_os = "wasi")]
+    let write_result = if std::io::stdin().is_terminal() {
+        // maximize compatibility
+        writeln!(stdout, r"/dev/tty")
+    } else {
+        set_exit_code(1);
+        writeln!(stdout, "{}", translate!("tty-not-a-tty"))
+    };
     #[cfg(target_os = "windows")]
     let write_result = if std::io::stdin().is_terminal() {
         writeln!(stdout, r"\\.\CON")