Add File interface instead of using os.File

Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>

console.go

@@ -24,10 +24,17 @@ import (
 
 var ErrNotAConsole = errors.New("provided file is not a console")
 
+type File interface {
+	io.ReadWriteCloser
+
+	// Fd returns its file descriptor
+	Fd() uintptr
+	// Name returns its file name
+	Name() string
+}
+
 type Console interface {
-	io.Reader
-	io.Writer
-	io.Closer
+	File
 
 	// Resize resizes the console to the provided window size
 	Resize(WinSize) error
@@ -42,10 +49,6 @@ type Console interface {
 	Reset() error
 	// Size returns the window size of the console
 	Size() (WinSize, error)
-	// Fd returns the console's file descriptor
-	Fd() uintptr
-	// Name returns the console's file name
-	Name() string
 }
 
 // WinSize specifies the window size of the console
@@ -70,7 +73,7 @@ func Current() Console {
 }
 
 // ConsoleFromFile returns a console using the provided file
-func ConsoleFromFile(f *os.File) (Console, error) {
+func ConsoleFromFile(f File) (Console, error) {
 	if err := checkConsole(f); err != nil {
 		return nil, err
 	}

console_unix.go

@@ -47,7 +47,7 @@ func NewPty() (Console, string, error) {
 }
 
 type master struct {
-	f        *os.File
+	f        File
 	original *unix.Termios
 }
 
@@ -122,15 +122,15 @@ func (m *master) Name() string {
 }
 
 // checkConsole checks if the provided file is a console
-func checkConsole(f *os.File) error {
+func checkConsole(f File) error {
 	var termios unix.Termios
 	if tcget(f.Fd(), &termios) != nil {
 		return ErrNotAConsole
 	}
 	return nil
 }
 
-func newMaster(f *os.File) (Console, error) {
+func newMaster(f File) (Console, error) {
 	m := &master{
 		f: f,
 	}

console_windows.go

@@ -198,15 +198,15 @@ func makeInputRaw(fd windows.Handle, mode uint32) error {
 	return nil
 }
 
-func checkConsole(f *os.File) error {
+func checkConsole(f File) error {
 	var mode uint32
 	if err := windows.GetConsoleMode(windows.Handle(f.Fd()), &mode); err != nil {
 		return err
 	}
 	return nil
 }
 
-func newMaster(f *os.File) (Console, error) {
+func newMaster(f File) (Console, error) {
 	if f != os.Stdin && f != os.Stdout && f != os.Stderr {
 		return nil, errors.New("creating a console from a file is not supported on windows")
 	}