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#pragma once
#include "cru/common/base.hpp"
#include <fmt/format.h>
#include <fmt/ostream.h>
#include <iostream>
#include <list>
#include <memory>
#include <string_view>
namespace cru::log {
enum class LogLevel { Debug, Info, Warn, Error };
struct ILogSource : virtual Interface {
// Write the string s. LogLevel is just a helper. It has no effect on the
// content to write.
virtual void Write(LogLevel level, const std::string_view& s) = 0;
};
class StdioLogSource : public virtual ILogSource {
public:
StdioLogSource() = default;
CRU_DELETE_COPY(StdioLogSource)
CRU_DELETE_MOVE(StdioLogSource)
~StdioLogSource() override = default;
void Write(LogLevel level, const std::string_view& s) override {
// TODO: Emmm... Since it is buggy to use narrow char in UTF-8 on Windows. I
// think this implementation might be broken. (However, I didn't test it.)
// Maybe, I should detect Windows and use wide char (And I didn't test this
// either) or other more complicated implementation. Currently, I settled
// with this.
if (level == LogLevel::Error) {
std::cerr << s;
} else {
std::cout << s;
}
}
};
class Logger : public Object {
public:
static Logger* GetInstance();
public:
Logger() = default;
CRU_DELETE_COPY(Logger)
CRU_DELETE_MOVE(Logger)
~Logger() override = default;
public:
void AddSource(std::unique_ptr<ILogSource> source);
void RemoveSource(ILogSource* source);
public:
void Log(LogLevel level, const std::string_view& s);
public:
std::list<std::unique_ptr<ILogSource>> sources_;
};
template <typename... TArgs>
void Debug([[maybe_unused]] TArgs&&... args) {
#ifdef CRU_DEBUG
Logger::GetInstance()->Log(LogLevel::Debug,
fmt::format(std::forward<TArgs>(args)...));
#endif
}
template <typename... TArgs>
void Info(TArgs&&... args) {
Logger::GetInstance()->Log(LogLevel::Info,
fmt::format(std::forward<TArgs>(args)...));
}
template <typename... TArgs>
void Warn(TArgs&&... args) {
Logger::GetInstance()->Log(LogLevel::Warn,
fmt::format(std::forward<TArgs>(args)...));
}
template <typename... TArgs>
void Error(TArgs&&... args) {
Logger::GetInstance()->Log(LogLevel::Error,
fmt::format(std::forward<TArgs>(args)...));
}
} // namespace cru::log
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