Fix windows compilation

run.go

@@ -1,6 +1,3 @@
-//go:build !windows
-// +build !windows
-
 package pty
 
 import (
@@ -18,21 +15,6 @@ func Start(cmd *exec.Cmd) (*os.File, error) {
 	return StartWithSize(cmd, nil)
 }
 
-// StartWithSize assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
-// and c.Stderr, calls c.Start, and returns the File of the tty's
-// corresponding pty.
-//
-// This will resize the pty to the specified size before starting the command.
-// Starts the process in a new session and sets the controlling terminal.
-func StartWithSize(cmd *exec.Cmd, ws *Winsize) (*os.File, error) {
-	if cmd.SysProcAttr == nil {
-		cmd.SysProcAttr = &syscall.SysProcAttr{}
-	}
-	cmd.SysProcAttr.Setsid = true
-	cmd.SysProcAttr.Setctty = true
-	return StartWithAttrs(cmd, ws, cmd.SysProcAttr)
-}
-
 // StartWithAttrs assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
 // and c.Stderr, calls c.Start, and returns the File of the tty's
 // corresponding pty.

start.go

@@ -0,0 +1,25 @@
+//go:build !windows
+// +build !windows
+
+package pty
+
+import (
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+// StartWithSize assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
+// and c.Stderr, calls c.Start, and returns the File of the tty's
+// corresponding pty.
+//
+// This will resize the pty to the specified size before starting the command.
+// Starts the process in a new session and sets the controlling terminal.
+func StartWithSize(cmd *exec.Cmd, ws *Winsize) (*os.File, error) {
+	if cmd.SysProcAttr == nil {
+		cmd.SysProcAttr = &syscall.SysProcAttr{}
+	}
+	cmd.SysProcAttr.Setsid = true
+	cmd.SysProcAttr.Setctty = true
+	return StartWithAttrs(cmd, ws, cmd.SysProcAttr)
+}

start_windows.go

@@ -0,0 +1,20 @@
+//go:build windows
+// +build windows
+
+package pty
+
+import (
+	"errors"
+	"os"
+	"os/exec"
+)
+
+// StartWithSize assigns a pseudo-terminal tty os.File to c.Stdin, c.Stdout,
+// and c.Stderr, calls c.Start, and returns the File of the tty's
+// corresponding pty.
+//
+// This will resize the pty to the specified size before starting the command.
+// Starts the process in a new session and sets the controlling terminal.
+func StartWithSize(cmd *exec.Cmd, ws *Winsize) (*os.File, error) {
+	return nil, errors.New("unsupported platform")
+}