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// SPDX-License-Identifier: GPL-3.0-or-later
package tui
import (
"fmt"
"os"
"golang.org/x/term"
)
// ReadKey reads one keypress without Enter, restoring the terminal before
// it returns - on every path, including an error. It always reads a
// single byte; only a terminal is first put into raw mode, so a
// non-terminal (a pipe, in tests) needs no pty to exercise it.
func ReadKey(in *os.File) (rune, error) {
fd := int(in.Fd())
if !isTerminal(fd) {
return readByte(in)
}
state, err := term.MakeRaw(fd)
if err != nil {
return 0, fmt.Errorf("tui: %w", err)
}
defer term.Restore(fd, state)
return readByte(in)
}
func readByte(in *os.File) (rune, error) {
var b [1]byte
if _, err := in.Read(b[:]); err != nil {
return 0, err
}
return rune(b[0]), nil
}
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