polybar/include/components/logger.hpp

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#pragma once
#include <cstdio>
#include <map>
#include <string>
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#include <thread>
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#include "common.hpp"
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POLYBAR_NS
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enum class loglevel : uint8_t {
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NONE = 0,
ERROR,
WARNING,
INFO,
TRACE,
};
class logger {
public:
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using make_type = const logger&;
static make_type make(loglevel level = loglevel::NONE);
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explicit logger(loglevel level);
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static loglevel parse_verbosity(const string& name, loglevel fallback = loglevel::NONE);
void verbosity(loglevel&& level);
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#ifdef DEBUG_LOGGER // {{{
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template <typename... Args>
void trace(string message, Args... args) const {
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output(loglevel::TRACE, message, args...);
}
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#ifdef VERBOSE_TRACELOG
template <typename... Args>
void trace_x(string message, Args... args) const {
output(loglevel::TRACE, message, args...);
}
#else
template <typename... Args>
void trace_x(Args...) const {}
#endif
#else
template <typename... Args>
void trace(Args...) const {}
template <typename... Args>
void trace_x(Args...) const {}
#endif // }}}
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/**
* Output an info message
*/
template <typename... Args>
void info(string message, Args... args) const {
output(loglevel::INFO, message, args...);
}
/**
* Output a warning message
*/
template <typename... Args>
void warn(string message, Args... args) const {
output(loglevel::WARNING, message, args...);
}
/**
* Output an error message
*/
template <typename... Args>
void err(string message, Args... args) const {
output(loglevel::ERROR, message, args...);
}
protected:
template <typename T>
decltype(auto) convert(T&& arg) const {
return forward<T>(arg);
}
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/**
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* Convert string
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*/
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const char* convert(string arg) const; // NOLINT
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/**
* Convert thread id
*/
size_t convert(const std::thread::id arg) const;
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/**
* Write the log message to the output channel
* if the defined verbosity level allows it
*/
template <typename... Args>
void output(loglevel level, string format, Args... values) const {
if (level > m_level) {
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return;
}
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#if defined(__clang__) // {{{
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#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-security"
#elif defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat-security"
#endif // }}}
dprintf(m_fd, (m_prefixes.at(level) + format + m_suffixes.at(level) + "\n").c_str(), convert(values)...);
#if defined(__clang__) // {{{
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#pragma clang diagnostic pop
#elif defined(__GNUC__)
#pragma GCC diagnostic pop
#endif // }}}
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}
private:
/**
* Logger verbosity level
*/
loglevel m_level{loglevel::TRACE};
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/**
* File descriptor used when writing the log messages
*/
int m_fd{STDERR_FILENO};
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/**
* Loglevel specific prefixes
*/
std::map<loglevel, string> m_prefixes;
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/**
* Loglevel specific suffixes
*/
std::map<loglevel, string> m_suffixes;
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};
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POLYBAR_NS_END