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// Copyright 2019 Roman Perepelitsa.
//
// This file is part of GitStatus.
//
// GitStatus is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GitStatus is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
#ifndef ROMKATV_GITSTATUS_LOGGING_H_
#define ROMKATV_GITSTATUS_LOGGING_H_
#include <cstdlib>
#include <memory>
#include <ostream>
#include <sstream>
#define LOG(severity) LOG_I(severity)
#define LOG_I(severity) \
(::gitstatus::severity < ::gitstatus::g_min_log_level) \
? static_cast<void>(0) \
: ::gitstatus::internal_logging::Assignable() = \
::gitstatus::internal_logging::LogStream<::gitstatus::severity>(__FILE__, __LINE__, \
::gitstatus::severity) \
.ref()
namespace gitstatus {
enum LogLevel {
DEBUG,
INFO,
WARN,
ERROR,
FATAL,
};
const char* LogLevelStr(LogLevel lvl);
bool ParseLogLevel(const char* s, LogLevel& lvl);
extern LogLevel g_min_log_level;
namespace internal_logging {
struct Assignable {
template <class T>
void operator=(const T&) const {}
};
class LogStreamBase {
public:
LogStreamBase(const char* file, int line, LogLevel lvl);
LogStreamBase& ref() { return *this; }
std::ostream& strm() { return *strm_; }
int stashed_errno() const { return errno_; }
protected:
void Flush();
private:
int errno_;
const char* file_;
int line_;
const char* lvl_;
std::unique_ptr<std::ostringstream> strm_;
};
template <LogLevel>
class LogStream : public LogStreamBase {
public:
using LogStreamBase::LogStreamBase;
~LogStream() { this->Flush(); }
};
template <>
class LogStream<FATAL> : public LogStreamBase {
public:
using LogStreamBase::LogStreamBase;
~LogStream() __attribute__((noreturn)) {
this->Flush();
std::abort();
}
};
template <class T>
LogStreamBase& operator<<(LogStreamBase& strm, const T& val) {
strm.strm() << val;
return strm;
}
inline LogStreamBase& operator<<(LogStreamBase& strm, std::ostream& (*manip)(std::ostream&)) {
strm.strm() << manip;
return strm;
}
struct Errno {
int err;
};
std::ostream& operator<<(std::ostream& strm, Errno e);
struct StashedErrno {};
inline LogStreamBase& operator<<(LogStreamBase& strm, StashedErrno) {
return strm << Errno{strm.stashed_errno()};
}
} // namespace internal_logging
inline internal_logging::Errno Errno(int err) { return {err}; }
inline internal_logging::StashedErrno Errno() { return {}; }
} // namespace gitstatus
#endif // ROMKATV_GITSTATUS_LOGGING_H_
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