feat: publish the Sandwich Hime source preview

Signed-off-by: Cole Speelman <gamertan@noreply.localhost>

internal/compiler/replace_windows.go

@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+//go:build windows
+
+package compiler
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+var replaceFileW = syscall.NewLazyDLL("kernel32.dll").NewProc("ReplaceFileW")
+
+// replaceFile uses ReplaceFileW when a destination exists because os.Rename is
+// not an atomic replacement primitive on Windows. A new destination can use
+// os.Rename: there is no last-good file whose visibility must be preserved.
+func replaceFile(replacement, destination string) error {
+	if _, err := os.Lstat(destination); err != nil {
+		if os.IsNotExist(err) {
+			return os.Rename(replacement, destination)
+		}
+		return err
+	}
+	destinationUTF16, err := syscall.UTF16PtrFromString(destination)
+	if err != nil {
+		return err
+	}
+	replacementUTF16, err := syscall.UTF16PtrFromString(replacement)
+	if err != nil {
+		return err
+	}
+	result, _, callErr := replaceFileW.Call(
+		uintptr(unsafe.Pointer(destinationUTF16)),
+		uintptr(unsafe.Pointer(replacementUTF16)),
+		0,
+		1, // REPLACEFILE_WRITE_THROUGH
+		0,
+		0,
+	)
+	if result == 0 {
+		return callErr
+	}
+	return nil
+}