Vendor ConPtySystem (#7656)

The repo we were depending on is very large and we need very small part
of it.

---------

Co-authored-by: Pavel <pavel@krymets.com>

codex-rs/utils/pty/src/win/conpty.rs

@@ -0,0 +1,144 @@
+#![allow(clippy::unwrap_used)]
+
+// This file is copied from https://github.com/wezterm/wezterm (MIT license).
+// Copyright (c) 2018-Present Wez Furlong
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+use crate::win::psuedocon::PsuedoCon;
+use anyhow::Error;
+use filedescriptor::FileDescriptor;
+use filedescriptor::Pipe;
+use portable_pty::cmdbuilder::CommandBuilder;
+use portable_pty::Child;
+use portable_pty::MasterPty;
+use portable_pty::PtyPair;
+use portable_pty::PtySize;
+use portable_pty::PtySystem;
+use portable_pty::SlavePty;
+use std::sync::Arc;
+use std::sync::Mutex;
+use winapi::um::wincon::COORD;
+
+#[derive(Default)]
+pub struct ConPtySystem {}
+
+impl PtySystem for ConPtySystem {
+    fn openpty(&self, size: PtySize) -> anyhow::Result<PtyPair> {
+        let stdin = Pipe::new()?;
+        let stdout = Pipe::new()?;
+
+        let con = PsuedoCon::new(
+            COORD {
+                X: size.cols as i16,
+                Y: size.rows as i16,
+            },
+            stdin.read,
+            stdout.write,
+        )?;
+
+        let master = ConPtyMasterPty {
+            inner: Arc::new(Mutex::new(Inner {
+                con,
+                readable: stdout.read,
+                writable: Some(stdin.write),
+                size,
+            })),
+        };
+
+        let slave = ConPtySlavePty {
+            inner: master.inner.clone(),
+        };
+
+        Ok(PtyPair {
+            master: Box::new(master),
+            slave: Box::new(slave),
+        })
+    }
+}
+
+struct Inner {
+    con: PsuedoCon,
+    readable: FileDescriptor,
+    writable: Option<FileDescriptor>,
+    size: PtySize,
+}
+
+impl Inner {
+    pub fn resize(
+        &mut self,
+        num_rows: u16,
+        num_cols: u16,
+        pixel_width: u16,
+        pixel_height: u16,
+    ) -> Result<(), Error> {
+        self.con.resize(COORD {
+            X: num_cols as i16,
+            Y: num_rows as i16,
+        })?;
+        self.size = PtySize {
+            rows: num_rows,
+            cols: num_cols,
+            pixel_width,
+            pixel_height,
+        };
+        Ok(())
+    }
+}
+
+#[derive(Clone)]
+pub struct ConPtyMasterPty {
+    inner: Arc<Mutex<Inner>>,
+}
+
+pub struct ConPtySlavePty {
+    inner: Arc<Mutex<Inner>>,
+}
+
+impl MasterPty for ConPtyMasterPty {
+    fn resize(&self, size: PtySize) -> anyhow::Result<()> {
+        let mut inner = self.inner.lock().unwrap();
+        inner.resize(size.rows, size.cols, size.pixel_width, size.pixel_height)
+    }
+
+    fn get_size(&self) -> Result<PtySize, Error> {
+        let inner = self.inner.lock().unwrap();
+        Ok(inner.size)
+    }
+
+    fn try_clone_reader(&self) -> anyhow::Result<Box<dyn std::io::Read + Send>> {
+        Ok(Box::new(self.inner.lock().unwrap().readable.try_clone()?))
+    }
+
+    fn take_writer(&self) -> anyhow::Result<Box<dyn std::io::Write + Send>> {
+        Ok(Box::new(
+            self.inner
+                .lock()
+                .unwrap()
+                .writable
+                .take()
+                .ok_or_else(|| anyhow::anyhow!("writer already taken"))?,
+        ))
+    }
+}
+
+impl SlavePty for ConPtySlavePty {
+    fn spawn_command(&self, cmd: CommandBuilder) -> anyhow::Result<Box<dyn Child + Send + Sync>> {
+        let inner = self.inner.lock().unwrap();
+        let child = inner.con.spawn_command(cmd)?;
+        Ok(Box::new(child))
+    }
+}