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module;
#include <asio.hpp>
#include <asio/experimental/awaitable_operators.hpp>
#include <array>
#include <chrono>
#include <span>
#include <vector>
export module ttwhy.terminal:readers;
import :events;
import :policies;
import :scanner;
import ttwhy.core;
namespace ttwhy::terminal
{
export template<typename TerminalPolicy = xterm_policy, typename InputStream, ttwhy::router<input_event> AppRouter>
auto read_events(InputStream & stream, AppRouter & router) -> asio::awaitable<void>
{
using namespace asio::experimental::awaitable_operators;
using namespace std::chrono_literals;
auto executor = co_await asio::this_coro::executor;
auto timer = asio::steady_timer{executor};
auto queue = std::vector<input_event>{};
queue.reserve(16);
auto sink = [&queue](auto const & event) {
queue.push_back(event);
};
auto scanner = terminal::scanner<decltype(sink), TerminalPolicy>{sink};
auto raw_buffer = std::array<char, 64>{};
while (true)
{
auto error = asio::error_code{};
auto bytes_read = 0uz;
if (scanner.is_pending())
{
timer.expires_after(50ms);
auto result = co_await (stream.async_read_some(asio::buffer(raw_buffer), asio::as_tuple(asio::use_awaitable)) ||
timer.async_wait(asio::as_tuple(asio::use_awaitable)));
if (result.index() == 0)
{
std::tie(error, bytes_read) = std::get<0>(result);
}
else
{
scanner.timeout();
for (auto const & event : queue)
{
co_await router.process(event);
}
queue.clear();
continue;
}
}
else
{
std::tie(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::terminal
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