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Add opt-in piped input support for POSIX systems

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Enables applications to read piped data while maintaining interactive
keyboard input by redirecting stdin to /dev/tty when explicitly enabled.
This commit is contained in:
Harri Pehkonen
2025-08-09 20:26:37 -07:00
committed by ArthurSonzogni
parent 0dde21f09e
commit def5c6d50c
4 changed files with 294 additions and 0 deletions
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51
src/ftxui/component/screen_interactive.cpp
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@@ -372,6 +372,24 @@ void ScreenInteractive::TrackMouse(bool enable) {
track_mouse_ = enable;
}
/// @brief Enable or disable automatic piped input handling.
/// When enabled, FTXUI will detect piped input and redirect stdin to /dev/tty
/// for keyboard input, allowing applications to read piped data while still
/// receiving interactive keyboard events.
/// @param enable Whether to enable piped input handling
/// @note This must be called before Loop().
/// @note This feature is disabled by default for backward compatibility.
/// @note This feature is only available on POSIX systems (Linux/macOS).
#if !defined(_WIN32) && !defined(__EMSCRIPTEN__)
void ScreenInteractive::HandlePipedInput(bool enable) {
handle_piped_input_ = enable;
}
#else
void ScreenInteractive::HandlePipedInput(bool /*enable*/) {
// This feature is not supported on this platform.
}
#endif
/// @brief Add a task to the main loop.
/// It will be executed later, after every other scheduled tasks.
void ScreenInteractive::Post(Task task) {
@@ -658,6 +676,28 @@ void ScreenInteractive::Install() {
// ensure it is fully applied:
Flush();
#if !defined(_WIN32) && !defined(__EMSCRIPTEN__)
// Handle piped input redirection if explicitly enabled by the application.
// This allows applications to read data from stdin while still receiving
// keyboard input from the terminal for interactive use.
if (handle_piped_input_ && !stdin_was_redirected_ && !isatty(STDIN_FILENO)) {
// Save the current stdin so we can restore it later
original_stdin_fd_ = dup(STDIN_FILENO);
if (original_stdin_fd_ >= 0) {
// Redirect stdin to the controlling terminal for keyboard input
if (freopen("/dev/tty", "r", stdin) != nullptr) {
stdin_was_redirected_ = true;
} else {
// Failed to open /dev/tty (containers, headless systems, etc.)
// Clean up and continue without redirection
close(original_stdin_fd_);
original_stdin_fd_ = -1;
}
}
// If dup() failed, we silently continue without redirection
}
#endif
quit_ = false;
PostAnimationTask();
@@ -666,6 +706,17 @@ void ScreenInteractive::Install() {
// private
void ScreenInteractive::Uninstall() {
ExitNow();
#if !defined(_WIN32) && !defined(__EMSCRIPTEN__)
// Restore stdin to its original state if we redirected it
if (stdin_was_redirected_ && original_stdin_fd_ >= 0) {
dup2(original_stdin_fd_, STDIN_FILENO);
close(original_stdin_fd_);
original_stdin_fd_ = -1;
stdin_was_redirected_ = false;
}
#endif
OnExit();
}