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#pragma once
#include <cstdint>
#include <format>
#include <iostream>
#include <ostream>
#include <print>
#include <string_view>
#include <utility>
// there is no standard way to ask whether a stream is a terminal
#ifdef HSDBG_WINDOWS
#include <io.h>
#else
#include <unistd.h>
#endif
namespace Hsdbg::Log
{
enum class Level : uint8_t
{
Trace,
Debug,
Info,
Warn,
Error,
};
namespace Detail
{
inline Level g_min_level =
#ifdef HSDBG_DIST
Level::Info;
#else
Level::Trace;
#endif
inline auto label(Level level) -> std::string_view
{
switch (level)
{
case Level::Trace: return "trace";
case Level::Debug: return "debug";
case Level::Info: return "info ";
case Level::Warn: return "warn ";
case Level::Error: return "error";
}
return "?????";
}
inline auto color(Level level) -> std::string_view
{
switch (level)
{
case Level::Trace: return "\x1b[90m";
case Level::Debug: return "\x1b[36m";
case Level::Info: return "\x1b[32m";
case Level::Warn: return "\x1b[33m";
case Level::Error: return "\x1b[31m";
}
return "";
}
inline auto is_terminal(bool to_stderr) -> bool
{
constexpr int STDOUT_DESCRIPTOR = 1;
constexpr int STDERR_DESCRIPTOR = 2;
const int descriptor = to_stderr ? STDERR_DESCRIPTOR : STDOUT_DESCRIPTOR;
#ifdef HSDBG_WINDOWS
return _isatty(descriptor) != 0;
#else
return isatty(descriptor) != 0;
#endif
}
inline auto write(Level level, std::string_view message) -> void
{
if (level < g_min_level)
return;
const bool to_stderr = level >= Level::Warn;
std::ostream& stream = to_stderr ? std::cerr : std::cout;
if (is_terminal(to_stderr))
std::println(stream, "{}{}\x1b[0m {}", color(level), label(level), message);
else
std::println(stream, "{} {}", label(level), message);
// never let a crash swallow the last lines that explain it
stream.flush();
}
}
inline auto set_min_level(Level level) -> void
{
Detail::g_min_level = level;
}
inline auto min_level() -> Level
{
return Detail::g_min_level;
}
template <typename... Args>
auto trace(std::format_string<Args...> fmt, Args&&... args) -> void
{
Detail::write(Level::Trace, std::format(fmt, std::forward<Args>(args)...));
}
template <typename... Args>
auto debug(std::format_string<Args...> fmt, Args&&... args) -> void
{
Detail::write(Level::Debug, std::format(fmt, std::forward<Args>(args)...));
}
template <typename... Args>
auto info(std::format_string<Args...> fmt, Args&&... args) -> void
{
Detail::write(Level::Info, std::format(fmt, std::forward<Args>(args)...));
}
template <typename... Args>
auto warn(std::format_string<Args...> fmt, Args&&... args) -> void
{
Detail::write(Level::Warn, std::format(fmt, std::forward<Args>(args)...));
}
template <typename... Args>
auto error(std::format_string<Args...> fmt, Args&&... args) -> void
{
Detail::write(Level::Error, std::format(fmt, std::forward<Args>(args)...));
}
}
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