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module;
#include <asio.hpp>
#include <format>
#include <span>
#include <vector>
export module ttwhy:io;
import :event;
import :scanner;
namespace ttwhy::io
{
export template<typename Stream, typename TerminalAttributes>
auto handle_signals(Stream & stream, TerminalAttributes & attributes) -> asio::awaitable<std::error_code>
{
auto executor = co_await asio::this_coro::executor;
auto signals = asio::signal_set{executor, SIGINT, SIGTERM};
signals.add(SIGTSTP);
signals.add(SIGCONT);
while (true)
{
auto [error, signal] = co_await signals.async_wait(asio::as_tuple(asio::use_awaitable));
if (error)
{
co_return error;
}
switch (signal)
{
case SIGINT:
case SIGTERM:
{
auto message = std::format("Received signal {}, exiting ...\n", signal);
co_await asio::async_write(stream, asio::buffer(message), asio::use_awaitable);
co_return asio::error_code{};
}
case SIGTSTP:
{
attributes.canonical_mode(true).echo(true);
::raise(SIGSTOP);
break;
}
case SIGCONT:
{
attributes.canonical_mode(false).echo(false);
break;
}
}
if (!error)
{
}
}
}
export template<typename InputStream, typename AppRouter>
auto read_events(InputStream & stream, AppRouter & router) -> asio::awaitable<void>
{
auto queue = std::vector<input_event>{};
queue.reserve(16);
auto scanner = ansi_scanner{queue};
auto raw_buffer = std::array<char, 64>{};
while (true)
{
auto [error, bytes_read] =
co_await stream.async_read_some(asio::buffer(raw_buffer), asio::as_tuple(asio::use_awaitable));
if (error)
{
if (error == asio::error::interrupted)
{
continue;
}
co_return;
}
auto const byte_span = std::span<char const>{raw_buffer.data(), bytes_read};
scanner.process(byte_span);
for (auto const & event : queue)
{
co_await router.process(event);
}
queue.clear();
}
}
} // namespace ttwhy::io
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