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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2025 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SWBLibc
final class TerminalAttributes {
#if !os(Windows)
private var term_attrs = termios()
#endif
fileprivate init() {
}
fileprivate func save() {
#if !os(Windows)
if tcgetattr(STDIN_FILENO, &term_attrs) == -1 {
// If we got an error here, just assume it is because the terminal wasn't capable.
return
}
#endif
}
fileprivate func restore() {
#if !os(Windows)
// Ignore failures, there isn't anything we can do.
tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_attrs)
#endif
}
func disableEcho() {
#if !os(Windows)
// Get the current terminal attributes.
var attrs = termios()
if tcgetattr(STDIN_FILENO, &attrs) == -1 {
// If we got an error here, just assume it is because the terminal wasn't capable.
return
}
// Clear the echo flag and update the attributes.
attrs.c_lflag &= ~tcflag_t(ECHO)
if tcsetattr(STDIN_FILENO, TCSAFLUSH, &attrs) == -1 {
perror("tcsetattr")
return
}
#endif
}
}
/// Save the active terminal attributes before executing `block` and restore them afterwards.
func withTerminalAttributes<T>(_ block: (TerminalAttributes) async throws -> T) async throws -> T {
let terminalAttributes = TerminalAttributes()
terminalAttributes.save()
defer { terminalAttributes.restore() }
return try await block(terminalAttributes)
}
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