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LibLine: Do a whole bunch of internal error propagation

This commit is contained in:
Tim Schumacher 2023-01-13 12:29:46 +01:00 committed by Sam Atkins
parent f9f1e1dd49
commit 40cb41a16c
8 changed files with 212 additions and 187 deletions

View file

@ -566,11 +566,11 @@ void Editor::initialize()
if (m_configuration.m_signal_mode == Configuration::WithSignalHandlers) {
m_signal_handlers.append(Core::EventLoop::register_signal(SIGINT, [this](int) {
interrupted();
interrupted().release_value_but_fixme_should_propagate_errors();
}));
m_signal_handlers.append(Core::EventLoop::register_signal(SIGWINCH, [this](int) {
resized();
resized().release_value_but_fixme_should_propagate_errors();
}));
}
@ -587,26 +587,26 @@ void Editor::refetch_default_termios()
m_termios = termios;
}
void Editor::interrupted()
ErrorOr<void> Editor::interrupted()
{
if (m_is_searching)
return m_search_editor->interrupted();
if (!m_is_editing)
return;
return {};
m_was_interrupted = true;
handle_interrupt_event();
if (!m_finish || !m_previous_interrupt_was_handled_as_interrupt)
return;
return {};
m_finish = false;
{
auto stderr_stream = Core::Stream::File::standard_error().release_value_but_fixme_should_propagate_errors();
reposition_cursor(*stderr_stream, true);
if (m_suggestion_display->cleanup())
reposition_cursor(*stderr_stream, true);
stderr_stream->write_entire_buffer("\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
auto stderr_stream = TRY(Core::Stream::File::standard_error());
TRY(reposition_cursor(*stderr_stream, true));
if (TRY(m_suggestion_display->cleanup()))
TRY(reposition_cursor(*stderr_stream, true));
TRY(stderr_stream->write_entire_buffer("\n"sv.bytes()));
}
m_buffer.clear();
m_chars_touched_in_the_middle = buffer().size();
@ -615,9 +615,10 @@ void Editor::interrupted()
m_notifier->set_enabled(false);
m_notifier = nullptr;
Core::EventLoop::current().quit(Retry);
return {};
}
void Editor::resized()
ErrorOr<void> Editor::resized()
{
m_was_resized = true;
m_previous_num_columns = m_num_columns;
@ -626,42 +627,47 @@ void Editor::resized()
if (!m_has_origin_reset_scheduled) {
// Reset the origin, but make sure it doesn't blow up if we can't read it
if (set_origin(false)) {
handle_resize_event(false);
TRY(handle_resize_event(false));
} else {
deferred_invoke([this] { handle_resize_event(true); });
deferred_invoke([this] { handle_resize_event(true).release_value_but_fixme_should_propagate_errors(); });
m_has_origin_reset_scheduled = true;
}
}
return {};
}
void Editor::handle_resize_event(bool reset_origin)
ErrorOr<void> Editor::handle_resize_event(bool reset_origin)
{
m_has_origin_reset_scheduled = false;
if (reset_origin && !set_origin(false)) {
m_has_origin_reset_scheduled = true;
return deferred_invoke([this] { handle_resize_event(true); });
deferred_invoke([this] { handle_resize_event(true).release_value_but_fixme_should_propagate_errors(); });
return {};
}
set_origin(m_origin_row, 1);
auto stderr_stream = Core::Stream::File::standard_error().release_value_but_fixme_should_propagate_errors();
auto stderr_stream = TRY(Core::Stream::File::standard_error());
reposition_cursor(*stderr_stream, true);
m_suggestion_display->redisplay(m_suggestion_manager, m_num_lines, m_num_columns);
TRY(reposition_cursor(*stderr_stream, true));
TRY(m_suggestion_display->redisplay(m_suggestion_manager, m_num_lines, m_num_columns));
m_origin_row = m_suggestion_display->origin_row();
reposition_cursor(*stderr_stream);
TRY(reposition_cursor(*stderr_stream));
if (m_is_searching)
m_search_editor->resized();
TRY(m_search_editor->resized());
return {};
}
void Editor::really_quit_event_loop()
ErrorOr<void> Editor::really_quit_event_loop()
{
m_finish = false;
{
auto stderr_stream = Core::Stream::File::standard_error().release_value_but_fixme_should_propagate_errors();
reposition_cursor(*stderr_stream, true);
stderr_stream->write_entire_buffer("\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
auto stderr_stream = TRY(Core::Stream::File::standard_error());
TRY(reposition_cursor(*stderr_stream, true));
TRY(stderr_stream->write_entire_buffer("\n"sv.bytes()));
}
auto string = line();
m_buffer.clear();
@ -675,6 +681,7 @@ void Editor::really_quit_event_loop()
m_notifier->set_enabled(false);
m_notifier = nullptr;
Core::EventLoop::current().quit(Exit);
return {};
}
auto Editor::get_line(DeprecatedString const& prompt) -> Result<DeprecatedString, Editor::Error>
@ -729,22 +736,22 @@ auto Editor::get_line(DeprecatedString const& prompt) -> Result<DeprecatedString
for (size_t i = 0; i < prompt_lines; ++i)
stderr_stream->write_entire_buffer("\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
VT::move_relative(-static_cast<int>(prompt_lines), 0, *stderr_stream);
VT::move_relative(-static_cast<int>(prompt_lines), 0, *stderr_stream).release_value_but_fixme_should_propagate_errors();
}
set_origin();
m_history_cursor = m_history.size();
refresh_display();
refresh_display().release_value_but_fixme_should_propagate_errors();
Core::EventLoop loop;
m_notifier = Core::Notifier::construct(STDIN_FILENO, Core::Notifier::Read);
m_notifier->on_ready_to_read = [&] { try_update_once(); };
m_notifier->on_ready_to_read = [&] { try_update_once().release_value_but_fixme_should_propagate_errors(); };
if (!m_incomplete_data.is_empty())
deferred_invoke([&] { try_update_once(); });
deferred_invoke([&] { try_update_once().release_value_but_fixme_should_propagate_errors(); });
if (loop.exec() == Retry)
return get_line(prompt);
@ -770,21 +777,23 @@ void Editor::save_to(JsonObject& object)
object.set("used_display_area", move(display_area));
}
void Editor::try_update_once()
ErrorOr<void> Editor::try_update_once()
{
if (m_was_interrupted) {
handle_interrupt_event();
}
handle_read_event();
TRY(handle_read_event());
if (m_always_refresh)
m_refresh_needed = true;
refresh_display();
TRY(refresh_display());
if (m_finish)
really_quit_event_loop();
TRY(really_quit_event_loop());
return {};
}
void Editor::handle_interrupt_event()
@ -811,11 +820,11 @@ void Editor::handle_interrupt_event()
finish();
}
void Editor::handle_read_event()
ErrorOr<void> Editor::handle_read_event()
{
if (m_prohibit_input_processing) {
m_have_unprocessed_read_event = true;
return;
return {};
}
auto prohibit_scope = prohibit_input();
@ -830,14 +839,14 @@ void Editor::handle_read_event()
if (errno == EINTR) {
if (!m_was_interrupted) {
if (m_was_resized)
return;
return {};
finish();
return;
return {};
}
handle_interrupt_event();
return;
return {};
}
ScopedValueRollback errno_restorer(errno);
@ -845,7 +854,7 @@ void Editor::handle_read_event()
m_input_error = Error::ReadFailure;
finish();
return;
return {};
}
m_incomplete_data.append(keybuf, nread);
@ -854,7 +863,7 @@ void Editor::handle_read_event()
if (available_bytes == 0) {
m_input_error = Error::Empty;
finish();
return;
return {};
}
auto reverse_tab = false;
@ -900,7 +909,7 @@ void Editor::handle_read_event()
default: {
m_callback_machine.key_pressed(*this, { code_point, Key::Alt });
m_state = InputState::Free;
cleanup_suggestions();
TRY(cleanup_suggestions());
continue;
}
}
@ -958,7 +967,7 @@ void Editor::handle_read_event()
reverse_tab = true;
break;
}
cleanup_suggestions();
TRY(cleanup_suggestions());
switch (csi_final) {
case 'A': // ^[[A: arrow up
@ -1064,7 +1073,7 @@ void Editor::handle_read_event()
}
// There are no sequences past this point, so short of 'tab', we will want to cleanup the suggestions.
ArmedScopeGuard suggestion_cleanup { [this] { cleanup_suggestions(); } };
ArmedScopeGuard suggestion_cleanup { [this] { cleanup_suggestions().release_value_but_fixme_should_propagate_errors(); } };
// Normally ^D. `stty eof \^n` can change it to ^N (or something else), but Serenity doesn't have `stty` yet.
// Process this here since the keybinds might override its behavior.
@ -1156,8 +1165,8 @@ void Editor::handle_read_event()
for (auto& view : completion_result.insert)
insert(view);
auto stderr_stream = Core::Stream::File::standard_error().release_value_but_fixme_should_propagate_errors();
reposition_cursor(*stderr_stream);
auto stderr_stream = TRY(Core::Stream::File::standard_error());
TRY(reposition_cursor(*stderr_stream));
if (completion_result.style_to_apply.has_value()) {
// Apply the style of the last suggestion.
@ -1178,12 +1187,12 @@ void Editor::handle_read_event()
}
if (m_times_tab_pressed > 1 && m_suggestion_manager.count() > 0) {
if (m_suggestion_display->cleanup())
reposition_cursor(*stderr_stream);
if (TRY(m_suggestion_display->cleanup()))
TRY(reposition_cursor(*stderr_stream));
m_suggestion_display->set_initial_prompt_lines(m_prompt_lines_at_suggestion_initiation);
m_suggestion_display->display(m_suggestion_manager);
TRY(m_suggestion_display->display(m_suggestion_manager));
m_origin_row = m_suggestion_display->origin_row();
}
@ -1199,8 +1208,8 @@ void Editor::handle_read_event()
// We have none, or just one suggestion,
// we should just commit that and continue
// after it, as if it were auto-completed.
reposition_cursor(*stderr_stream, true);
cleanup_suggestions();
TRY(reposition_cursor(*stderr_stream, true));
TRY(cleanup_suggestions());
m_remembered_suggestion_static_data.clear_with_capacity();
}
continue;
@ -1209,7 +1218,7 @@ void Editor::handle_read_event()
// If we got here, manually cleanup the suggestions and then insert the new code point.
m_remembered_suggestion_static_data.clear_with_capacity();
suggestion_cleanup.disarm();
cleanup_suggestions();
TRY(cleanup_suggestions());
insert(code_point);
}
@ -1221,10 +1230,12 @@ void Editor::handle_read_event()
}
if (!m_incomplete_data.is_empty() && !m_finish)
deferred_invoke([&] { try_update_once(); });
deferred_invoke([&] { try_update_once().release_value_but_fixme_should_propagate_errors(); });
return {};
}
void Editor::cleanup_suggestions()
ErrorOr<void> Editor::cleanup_suggestions()
{
if (m_times_tab_pressed != 0) {
// Apply the style of the last suggestion.
@ -1232,15 +1243,16 @@ void Editor::cleanup_suggestions()
stylize({ m_suggestion_manager.current_suggestion().start_index, m_cursor, Span::Mode::CodepointOriented }, m_suggestion_manager.current_suggestion().style);
// We probably have some suggestions drawn,
// let's clean them up.
if (m_suggestion_display->cleanup()) {
auto stderr_stream = Core::Stream::File::standard_error().release_value_but_fixme_should_propagate_errors();
reposition_cursor(*stderr_stream);
if (TRY(m_suggestion_display->cleanup())) {
auto stderr_stream = TRY(Core::Stream::File::standard_error());
TRY(reposition_cursor(*stderr_stream));
m_refresh_needed = true;
}
m_suggestion_manager.reset();
m_suggestion_display->finish();
}
m_times_tab_pressed = 0; // Safe to say if we get here, the user didn't press TAB
return {};
}
bool Editor::search(StringView phrase, bool allow_empty, bool from_beginning)
@ -1298,22 +1310,24 @@ void Editor::recalculate_origin()
// but that will be calculated and applied at the next
// refresh cycle.
}
void Editor::cleanup()
ErrorOr<void> Editor::cleanup()
{
auto current_buffer_metrics = actual_rendered_string_metrics(buffer_view(), m_current_masks);
auto new_lines = current_prompt_metrics().lines_with_addition(current_buffer_metrics, m_num_columns);
if (new_lines < m_shown_lines)
m_extra_forward_lines = max(m_shown_lines - new_lines, m_extra_forward_lines);
auto stderr_stream = Core::Stream::File::standard_error().release_value_but_fixme_should_propagate_errors();
reposition_cursor(*stderr_stream, true);
auto stderr_stream = TRY(Core::Stream::File::standard_error());
TRY(reposition_cursor(*stderr_stream, true));
auto current_line = num_lines() - 1;
VT::clear_lines(current_line, m_extra_forward_lines, *stderr_stream);
TRY(VT::clear_lines(current_line, m_extra_forward_lines, *stderr_stream));
m_extra_forward_lines = 0;
reposition_cursor(*stderr_stream);
TRY(reposition_cursor(*stderr_stream));
return {};
};
void Editor::refresh_display()
ErrorOr<void> Editor::refresh_display()
{
Core::Stream::AllocatingMemoryStream output_stream;
ScopeGuard flush_stream {
@ -1339,7 +1353,7 @@ void Editor::refresh_display()
m_refresh_needed = true;
swap(m_previous_num_columns, m_num_columns);
recalculate_origin();
cleanup();
TRY(cleanup());
swap(m_previous_num_columns, m_num_columns);
has_cleaned_up = true;
}
@ -1353,22 +1367,22 @@ void Editor::refresh_display()
if (m_origin_row + current_num_lines > m_num_lines) {
if (current_num_lines > m_num_lines) {
for (size_t i = 0; i < m_num_lines; ++i)
output_stream.write_entire_buffer("\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(output_stream.write_entire_buffer("\n"sv.bytes()));
m_origin_row = 0;
} else {
auto old_origin_row = m_origin_row;
m_origin_row = m_num_lines - current_num_lines + 1;
for (size_t i = 0; i < old_origin_row - m_origin_row; ++i)
output_stream.write_entire_buffer("\n"sv.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(output_stream.write_entire_buffer("\n"sv.bytes()));
}
}
// Do not call hook on pure cursor movement.
if (m_cached_prompt_valid && !m_refresh_needed && m_pending_chars.size() == 0) {
// Probably just moving around.
reposition_cursor(output_stream);
TRY(reposition_cursor(output_stream));
m_cached_buffer_metrics = actual_rendered_string_metrics(buffer_view(), m_current_masks);
m_drawn_end_of_line_offset = m_buffer.size();
return;
return {};
}
if (on_display_refresh)
@ -1378,17 +1392,17 @@ void Editor::refresh_display()
if (!m_refresh_needed && m_cursor == m_buffer.size()) {
// Just write the characters out and continue,
// no need to refresh the entire line.
output_stream.write_entire_buffer(m_pending_chars).release_value_but_fixme_should_propagate_errors();
TRY(output_stream.write_entire_buffer(m_pending_chars));
m_pending_chars.clear();
m_drawn_cursor = m_cursor;
m_drawn_end_of_line_offset = m_buffer.size();
m_cached_buffer_metrics = actual_rendered_string_metrics(buffer_view(), m_current_masks);
m_drawn_spans = m_current_spans;
return;
return {};
}
}
auto apply_styles = [&, empty_styles = HashMap<u32, Style> {}](size_t i) {
auto apply_styles = [&, empty_styles = HashMap<u32, Style> {}](size_t i) -> ErrorOr<void> {
auto ends = m_current_spans.m_spans_ending.get(i).value_or(empty_styles);
auto starts = m_current_spans.m_spans_starting.get(i).value_or(empty_styles);
@ -1405,11 +1419,11 @@ void Editor::refresh_display()
style.unify_with(applicable_style.value);
// Disable any style that should be turned off.
VT::apply_style(style, output_stream, false);
TRY(VT::apply_style(style, output_stream, false));
// Reapply styles for overlapping spans that include this one.
style = find_applicable_style(i);
VT::apply_style(style, output_stream, true);
TRY(VT::apply_style(style, output_stream, true));
}
if (starts.size() || anchored_starts.size()) {
Style style;
@ -1421,8 +1435,10 @@ void Editor::refresh_display()
style.unify_with(applicable_style.value);
// Set new styles.
VT::apply_style(style, output_stream, true);
TRY(VT::apply_style(style, output_stream, true));
}
return {};
};
auto print_character_at = [&](size_t i) {
@ -1445,7 +1461,7 @@ void Editor::refresh_display()
} else {
c = m_buffer[i];
}
auto print_single_character = [&](auto c) {
auto print_single_character = [&](auto c) -> ErrorOr<void> {
StringBuilder builder;
bool should_print_masked = is_ascii_control(c) && c != '\n';
bool should_print_caret = c < 64 && should_print_masked;
@ -1457,30 +1473,32 @@ void Editor::refresh_display()
builder.append(Utf32View { &c, 1 });
if (should_print_masked)
output_stream.write_entire_buffer("\033[7m"sv.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(output_stream.write_entire_buffer("\033[7m"sv.bytes()));
output_stream.write_entire_buffer(builder.string_view().bytes()).release_value_but_fixme_should_propagate_errors();
TRY(output_stream.write_entire_buffer(builder.string_view().bytes()));
if (should_print_masked)
output_stream.write_entire_buffer("\033[27m"sv.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(output_stream.write_entire_buffer("\033[27m"sv.bytes()));
return {};
};
c.visit(
[&](u32 c) { print_single_character(c); },
[&](auto& view) { for (auto c : view) print_single_character(c); });
[&](u32 c) { print_single_character(c).release_value_but_fixme_should_propagate_errors(); },
[&](auto& view) { for (auto c : view) print_single_character(c).release_value_but_fixme_should_propagate_errors(); });
};
// If there have been no changes to previous sections of the line (style or text)
// just append the new text with the appropriate styles.
if (!m_always_refresh && m_cached_prompt_valid && m_chars_touched_in_the_middle == 0 && m_drawn_spans.contains_up_to_offset(m_current_spans, m_drawn_cursor)) {
auto initial_style = find_applicable_style(m_drawn_end_of_line_offset);
VT::apply_style(initial_style, output_stream);
TRY(VT::apply_style(initial_style, output_stream));
for (size_t i = m_drawn_end_of_line_offset; i < m_buffer.size(); ++i) {
apply_styles(i);
TRY(apply_styles(i));
print_character_at(i);
}
VT::apply_style(Style::reset_style(), output_stream);
TRY(VT::apply_style(Style::reset_style(), output_stream));
m_pending_chars.clear();
m_refresh_needed = false;
m_cached_buffer_metrics = actual_rendered_string_metrics(buffer_view(), m_current_masks);
@ -1489,7 +1507,7 @@ void Editor::refresh_display()
m_drawn_end_of_line_offset = m_buffer.size();
// No need to reposition the cursor, the cursor is already where it needs to be.
return;
return {};
}
if constexpr (LINE_EDITOR_DEBUG) {
@ -1514,20 +1532,20 @@ void Editor::refresh_display()
// Ouch, reflow entire line.
if (!has_cleaned_up) {
cleanup();
TRY(cleanup());
}
VT::move_absolute(m_origin_row, m_origin_column, output_stream);
TRY(VT::move_absolute(m_origin_row, m_origin_column, output_stream));
output_stream.write_entire_buffer(m_new_prompt.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(output_stream.write_entire_buffer(m_new_prompt.bytes()));
VT::clear_to_end_of_line(output_stream);
TRY(VT::clear_to_end_of_line(output_stream));
StringBuilder builder;
for (size_t i = 0; i < m_buffer.size(); ++i) {
apply_styles(i);
TRY(apply_styles(i));
print_character_at(i);
}
VT::apply_style(Style::reset_style(), output_stream); // don't bleed to EOL
TRY(VT::apply_style(Style::reset_style(), output_stream)); // don't bleed to EOL
m_pending_chars.clear();
m_refresh_needed = false;
@ -1537,7 +1555,8 @@ void Editor::refresh_display()
m_drawn_end_of_line_offset = m_buffer.size();
m_cached_prompt_valid = true;
reposition_cursor(output_stream);
TRY(reposition_cursor(output_stream));
return {};
}
void Editor::strip_styles(bool strip_anchored)
@ -1555,7 +1574,7 @@ void Editor::strip_styles(bool strip_anchored)
m_refresh_needed = true;
}
void Editor::reposition_cursor(Core::Stream::Stream& stream, bool to_end)
ErrorOr<void> Editor::reposition_cursor(Core::Stream::Stream& stream, bool to_end)
{
auto cursor = m_cursor;
auto saved_cursor = m_cursor;
@ -1571,17 +1590,18 @@ void Editor::reposition_cursor(Core::Stream::Stream& stream, bool to_end)
ensure_free_lines_from_origin(line);
VERIFY(column + m_origin_column <= m_num_columns);
VT::move_absolute(line + m_origin_row, column + m_origin_column, stream);
TRY(VT::move_absolute(line + m_origin_row, column + m_origin_column, stream));
m_cursor = saved_cursor;
return {};
}
void VT::move_absolute(u32 row, u32 col, Core::Stream::Stream& stream)
ErrorOr<void> VT::move_absolute(u32 row, u32 col, Core::Stream::Stream& stream)
{
stream.write_entire_buffer(DeprecatedString::formatted("\033[{};{}H", row, col).bytes()).release_value_but_fixme_should_propagate_errors();
return stream.write_entire_buffer(DeprecatedString::formatted("\033[{};{}H", row, col).bytes());
}
void VT::move_relative(int row, int col, Core::Stream::Stream& stream)
ErrorOr<void> VT::move_relative(int row, int col, Core::Stream::Stream& stream)
{
char x_op = 'A', y_op = 'D';
@ -1595,9 +1615,11 @@ void VT::move_relative(int row, int col, Core::Stream::Stream& stream)
col = -col;
if (row > 0)
stream.write_entire_buffer(DeprecatedString::formatted("\033[{}{}", row, x_op).bytes()).release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer(DeprecatedString::formatted("\033[{}{}", row, x_op).bytes()));
if (col > 0)
stream.write_entire_buffer(DeprecatedString::formatted("\033[{}{}", col, y_op).bytes()).release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer(DeprecatedString::formatted("\033[{}{}", col, y_op).bytes()));
return {};
}
Style Editor::find_applicable_style(size_t offset) const
@ -1731,53 +1753,56 @@ DeprecatedString Style::to_deprecated_string() const
return builder.build();
}
void VT::apply_style(Style const& style, Core::Stream::Stream& stream, bool is_starting)
ErrorOr<void> VT::apply_style(Style const& style, Core::Stream::Stream& stream, bool is_starting)
{
if (is_starting) {
stream.write_entire_buffer(DeprecatedString::formatted("\033[{};{};{}m{}{}{}",
style.bold() ? 1 : 22,
style.underline() ? 4 : 24,
style.italic() ? 3 : 23,
style.background().to_vt_escape(),
style.foreground().to_vt_escape(),
style.hyperlink().to_vt_escape(true))
.bytes())
.release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer(DeprecatedString::formatted("\033[{};{};{}m{}{}{}",
style.bold() ? 1 : 22,
style.underline() ? 4 : 24,
style.italic() ? 3 : 23,
style.background().to_vt_escape(),
style.foreground().to_vt_escape(),
style.hyperlink().to_vt_escape(true))
.bytes()));
} else {
stream.write_entire_buffer(style.hyperlink().to_vt_escape(false).bytes()).release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer(style.hyperlink().to_vt_escape(false).bytes()));
}
return {};
}
void VT::clear_lines(size_t count_above, size_t count_below, Core::Stream::Stream& stream)
ErrorOr<void> VT::clear_lines(size_t count_above, size_t count_below, Core::Stream::Stream& stream)
{
if (count_below + count_above == 0) {
stream.write_entire_buffer("\033[2K"sv.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer("\033[2K"sv.bytes()));
} else {
// Go down count_below lines.
if (count_below > 0)
stream.write_entire_buffer(DeprecatedString::formatted("\033[{}B", count_below).bytes()).release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer(DeprecatedString::formatted("\033[{}B", count_below).bytes()));
// Then clear lines going upwards.
for (size_t i = count_below + count_above; i > 0; --i) {
stream.write_entire_buffer("\033[2K"sv.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer("\033[2K"sv.bytes()));
if (i != 1)
stream.write_entire_buffer("\033[A"sv.bytes()).release_value_but_fixme_should_propagate_errors();
TRY(stream.write_entire_buffer("\033[A"sv.bytes()));
}
}
return {};
}
void VT::save_cursor(Core::Stream::Stream& stream)
ErrorOr<void> VT::save_cursor(Core::Stream::Stream& stream)
{
stream.write_entire_buffer("\033[s"sv.bytes()).release_value_but_fixme_should_propagate_errors();
return stream.write_entire_buffer("\033[s"sv.bytes());
}
void VT::restore_cursor(Core::Stream::Stream& stream)
ErrorOr<void> VT::restore_cursor(Core::Stream::Stream& stream)
{
stream.write_entire_buffer("\033[u"sv.bytes()).release_value_but_fixme_should_propagate_errors();
return stream.write_entire_buffer("\033[u"sv.bytes());
}
void VT::clear_to_end_of_line(Core::Stream::Stream& stream)
ErrorOr<void> VT::clear_to_end_of_line(Core::Stream::Stream& stream)
{
stream.write_entire_buffer("\033[K"sv.bytes()).release_value_but_fixme_should_propagate_errors();
return stream.write_entire_buffer("\033[K"sv.bytes());
}
enum VTState {