Hijacking Standard streams for Windows ANSI Emulation

main.go

package main

func Main() {
    // everything that is currently in our main()
}

main_ansi.go

// +build !windows

package main

func main() {
    Main()
}

main_windows.go

// +build windows

func main() {
    term.Windows(Main)
}

term_windows.go

// +build windows

package term

var ch = make(chan struct{})

func init() {
    stdoutR, stdoutW, err := os.Pipe()
    if err != nil {
        panic(err)
    }

    os.Stdout = stdoutW
    go func() {
        emulateAnsi(stdoutR) // should be emulateAnsi(stdinW, stdoutR, stderrR)
        close(ch)
    }()
}

func Windows(f func()) {
    defer func() {
        os.Stdout.Close()
        <-ch
    }()
    f()
}

With respect to re-initializing the Stdin etc . The variables are of type File* which is a concrete type and not an interface.

I am having hard time reinitializing them in a polymorphic way.
Here are some of my unsuccessful attempts

http://play.golang.org/p/YmtxqGhorH
prog.go:32: cannot use f (type *MyFile) as type *File in argument to Hello

http://play.golang.org/p/TDxLBEYtE5

prog.go:22: cannot use wr (type *MyWriter) as type *os.File in assignment

http://play.golang.org/p/LtKvOFkbbi

prog.go:50: cannot use NewDerived1() (type *Derived1) as type *Base in assignment
prog.go:51: cannot use NewDerived2() (type *Derived2) as type *Base in assignment

http://play.golang.org/p/EHf4rtIEch

prog.go:47: cannot convert NewDerived1() (type *Derived1) to type PBASE
prog.go:48: cannot convert NewDerived2() (type *Derived2) to type PBASE
prog.go:53: arr[0].Foo undefined (type PBASE has no field or method Foo)
prog.go:54: arr[1].Foo undefined (type PBASE has no field or method Foo)
prog.go:55: arr[2].Foo undefined (type PBASE has no field or method Foo)