Program implies that Windows terminal supports ANSI but it's not always true

[flexits]

Although the actual Windows versions support ANSI terminal, it's never guaranteed this support is enabled by default. And if it's not, the program output looks like this:

The solution is to set the flag ENABLE_VIRTUAL_TERMINAL_PROCESSING before calling any clime functions. An implementation example:

const (
	ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x0004
	STD_OUTPUT_HANDLE                  = 0xFFFF_FFFF - 10
)

func EnableAnsi() error {
	modKernel32 := windows.NewLazyDLL("kernel32.dll")
	procGetStdHandle := modKernel32.NewProc("GetStdHandle")
	procGetConsoleMode := modKernel32.NewProc("GetConsoleMode")
	procSetConsoleMode := modKernel32.NewProc("SetConsoleMode")

	h, _, err := procGetStdHandle.Call(uintptr(STD_OUTPUT_HANDLE))
	if h == 0 {
		// TODO it'd be appropriate to use windows.GetLastError()
		return err
	}

	var mode uint32
	r, _, err := procGetConsoleMode.Call(h, uintptr(unsafe.Pointer(&mode)))
	if r == 0 {
		return err
	}

	newMode := mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING
	r, _, err = procSetConsoleMode.Call(h, uintptr(newMode))
	if r == 0 {
		return err
	}

	return nil
}

I skimmed through the code but it seems to use mostly stateless function and there's no general initialization function to put the EnableAnsi() call in.