package input import ( "errors" "fmt" "io" "os" "syscall" "github.com/nspcc-dev/neo-go/pkg/core/transaction" "github.com/nspcc-dev/neo-go/pkg/encoding/fixedn" "golang.org/x/term" ) // Terminal is a terminal used for input. If `nil`, stdin is used. var Terminal *term.Terminal // ReadWriter combiner reader and writer. type ReadWriter struct { io.Reader io.Writer } // ReadLine reads line from the input without trailing '\n'. func ReadLine(prompt string) (string, error) { trm := Terminal if trm == nil { s, err := term.MakeRaw(int(syscall.Stdin)) if err != nil { return "", err } defer func() { _ = term.Restore(int(syscall.Stdin), s) }() trm = term.NewTerminal(ReadWriter{ Reader: os.Stdin, Writer: os.Stdout, }, "") } return readLine(trm, prompt) } func readLine(trm *term.Terminal, prompt string) (string, error) { _, err := trm.Write([]byte(prompt)) if err != nil { return "", err } return trm.ReadLine() } // ReadPassword reads user password with prompt. func ReadPassword(prompt string) (string, error) { trm := Terminal if trm == nil { s, err := term.MakeRaw(int(syscall.Stdin)) if err != nil { return "", err } defer func() { _ = term.Restore(int(syscall.Stdin), s) }() trm = term.NewTerminal(ReadWriter{os.Stdin, os.Stdout}, prompt) } return trm.ReadPassword(prompt) } // ConfirmTx asks for a confirmation to send tx. func ConfirmTx(w io.Writer, tx *transaction.Transaction) error { fmt.Fprintf(w, "Network fee: %s\n", fixedn.Fixed8(tx.NetworkFee)) fmt.Fprintf(w, "System fee: %s\n", fixedn.Fixed8(tx.SystemFee)) fmt.Fprintf(w, "Total fee: %s\n", fixedn.Fixed8(tx.NetworkFee+tx.SystemFee)) ln, err := ReadLine("Relay transaction (y|N)> ") if err != nil { return err } if 0 < len(ln) && ln[0] == 'y' || ln[0] == 'Y' { return nil } return errors.New("cancelled") }