tty: add raw-vt and io raw modes

Author: samuel-williams-shopify

doc/api/tty.md

@@ -69,12 +69,18 @@ A `boolean` that is always `true` for `tty.ReadStream` instances.
 
 <!-- YAML
 added: v0.7.7
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/REPLACEME
+    description: The `mode` argument supports `'raw-vt'` and `'io'`.
 -->
 
-* `mode` {boolean} If `true`, configures the `tty.ReadStream` to operate as a
-  raw device. If `false`, configures the `tty.ReadStream` to operate in its
-  default mode. The `readStream.isRaw` property will be set to the resulting
-  mode.
+* `mode` {boolean|string} If `true` or `'raw-vt'`, configures the
+  `tty.ReadStream` to operate as a raw device. If `'io'`, configures the
+  `tty.ReadStream` to operate in binary-safe I/O mode. If `false`, configures
+  the `tty.ReadStream` to operate in its default mode. The `readStream.isRaw`
+  property will be set to whether the stream is in raw mode, and the
+  `readStream.rawMode` property will be set to the resulting mode.
 * Returns: {this} The read stream instance.
 
 Allows configuration of `tty.ReadStream` so that it operates as a raw device.
@@ -86,6 +92,22 @@ characters. <kbd>Ctrl</kbd>+<kbd>C</kbd> will no longer cause a `SIGINT` when
 in this mode. This mode does not affect terminal output processing, such as
 newline translation on Unix terminals.
 
+When in binary-safe I/O mode, terminal output processing is also disabled.
+This corresponds to libuv's `UV_TTY_MODE_IO` mode and is not supported on
+Windows.
+
+### `readStream.rawMode`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+* {boolean|string}
+
+The current raw mode for the `tty.ReadStream`. This is `false` when the stream
+is in its default mode, `'raw-vt'` when raw input mode is enabled, and `'io'`
+when binary-safe I/O mode is enabled.
+
 ## Class: `tty.WriteStream`
 
 <!-- YAML

lib/tty.js

@@ -68,20 +68,23 @@ function ReadStream(fd, options) {
   });
 
   this.isRaw = false;
+  this.rawMode = false;
   this.isTTY = true;
 }
 
 ObjectSetPrototypeOf(ReadStream.prototype, net.Socket.prototype);
 ObjectSetPrototypeOf(ReadStream, net.Socket);
 
-ReadStream.prototype.setRawMode = function(flag) {
-  flag = !!flag;
-  const err = this._handle?.setRawMode(flag);
+ReadStream.prototype.setRawMode = function(mode) {
+  const flag = !!mode;
+  const isIOMode = mode === 'io';
+  const err = this._handle?.setRawMode(flag, isIOMode);
   if (err) {
     this.emit('error', new ErrnoException(err, 'setRawMode'));
     return this;
   }
   this.isRaw = flag;
+  this.rawMode = flag ? (isIOMode ? 'io' : 'raw-vt') : false;
   return this;
 };
 

src/tty_wrap.cc

@@ -124,9 +124,15 @@ void TTYWrap::SetRawMode(const FunctionCallbackInfo<Value>& args) {
   // sequences at all on Windows, such as bracketed paste mode.
   // The Node.js readline implementation handles differences between
   // these modes.
-  int err = uv_tty_set_mode(
-      &wrap->handle_,
-      args[0]->IsTrue() ? UV_TTY_MODE_RAW_VT : UV_TTY_MODE_NORMAL);
+  uv_tty_mode_t mode;
+  if (!args[0]->IsTrue()) {
+    mode = UV_TTY_MODE_NORMAL;
+  } else if (args[1]->IsTrue()) {
+    mode = UV_TTY_MODE_IO;
+  } else {
+    mode = UV_TTY_MODE_RAW_VT;
+  }
+  int err = uv_tty_set_mode(&wrap->handle_, mode);
   args.GetReturnValue().Set(err);
 }
 

test/pseudo-tty/test-set-raw-mode-modes.js

@@ -0,0 +1,36 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+
+function isOnlcrEnabled() {
+  const { stdout, status } = spawnSync('stty', ['-a'], {
+    encoding: 'utf8',
+    stdio: ['inherit', 'pipe', 'inherit'],
+  });
+
+  assert.strictEqual(status, 0);
+  return /(?:^|[\s;])onlcr(?:[\s;]|$)/.test(stdout);
+}
+
+process.stdin.setRawMode(true);
+console.log(`raw=${isOnlcrEnabled()}`);
+assert.strictEqual(process.stdin.isRaw, true);
+assert.strictEqual(process.stdin.rawMode, 'raw-vt');
+
+process.stdin.setRawMode(false);
+console.log(`normal=${process.stdin.isRaw}`);
+assert.strictEqual(process.stdin.rawMode, false);
+
+process.stdin.setRawMode('raw-vt');
+console.log(`raw-vt=${isOnlcrEnabled()}`);
+assert.strictEqual(process.stdin.isRaw, true);
+assert.strictEqual(process.stdin.rawMode, 'raw-vt');
+
+process.stdin.setRawMode(false);
+process.stdin.setRawMode('io');
+console.log(`io=${isOnlcrEnabled()}`);
+assert.strictEqual(process.stdin.isRaw, true);
+assert.strictEqual(process.stdin.rawMode, 'io');
+
+process.stdin.setRawMode(false);

test/pseudo-tty/test-set-raw-mode-modes.out

@@ -0,0 +1,4 @@
+raw=true
+normal=false
+raw-vt=true
+io=false