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|
//go:build windows
// +build windows
package tea
import (
"fmt"
"io"
"os"
"sync"
"github.com/charmbracelet/x/term"
"github.com/erikgeiser/coninput"
"github.com/muesli/cancelreader"
"golang.org/x/sys/windows"
)
type conInputReader struct {
cancelMixin
conin windows.Handle
originalMode uint32
}
var _ cancelreader.CancelReader = &conInputReader{}
func newInputReader(r io.Reader) (cancelreader.CancelReader, error) {
fallback := func(io.Reader) (cancelreader.CancelReader, error) {
return cancelreader.NewReader(r)
}
if f, ok := r.(term.File); !ok || f.Fd() != os.Stdin.Fd() {
return fallback(r)
}
conin, err := coninput.NewStdinHandle()
if err != nil {
return fallback(r)
}
originalMode, err := prepareConsole(conin,
windows.ENABLE_MOUSE_INPUT,
windows.ENABLE_WINDOW_INPUT,
windows.ENABLE_EXTENDED_FLAGS,
)
if err != nil {
return nil, fmt.Errorf("failed to prepare console input: %w", err)
}
return &conInputReader{
conin: conin,
originalMode: originalMode,
}, nil
}
// Cancel implements cancelreader.CancelReader.
func (r *conInputReader) Cancel() bool {
r.setCanceled()
return windows.CancelIo(r.conin) == nil
}
// Close implements cancelreader.CancelReader.
func (r *conInputReader) Close() error {
if r.originalMode != 0 {
err := windows.SetConsoleMode(r.conin, r.originalMode)
if err != nil {
return fmt.Errorf("reset console mode: %w", err)
}
}
return nil
}
// Read implements cancelreader.CancelReader.
func (*conInputReader) Read(_ []byte) (n int, err error) {
return 0, nil
}
func prepareConsole(input windows.Handle, modes ...uint32) (originalMode uint32, err error) {
err = windows.GetConsoleMode(input, &originalMode)
if err != nil {
return 0, fmt.Errorf("get console mode: %w", err)
}
newMode := coninput.AddInputModes(0, modes...)
err = windows.SetConsoleMode(input, newMode)
if err != nil {
return 0, fmt.Errorf("set console mode: %w", err)
}
return originalMode, nil
}
// cancelMixin represents a goroutine-safe cancelation status.
type cancelMixin struct {
unsafeCanceled bool
lock sync.Mutex
}
func (c *cancelMixin) setCanceled() {
c.lock.Lock()
defer c.lock.Unlock()
c.unsafeCanceled = true
}
|
