looper/log.hpp

#pragma once
#include <stdio.h>
#include <streambuf>
#include <ostream>
#include <set>
#include <vector>
#include <variant>
#ifdef __ANDROID__
#include <android/log.h>
#endif
namespace Looper::Log {
    struct LogStream {
        std::set<FILE *> outputs;
        static std::set<FILE *> global_outputs;
        int my_log_level;
        std::set<LogStream*> streams;
        bool nested;
        bool need_prefix;
        std::vector<std::string> names;
        std::set<FILE*> get_used_outputs();

#ifdef __ANDROID__
        std::string line;
        std::set<android_LogPriority> android_outputs;
#endif
        LogStream(std::initializer_list<std::string> names, int log_level, bool nested, void* discriminator);

        public:
        static int log_level;
        void writeprefix();
        void writeln(const char *msg);
        void writeln_n(const char *msg, size_t n);
        void writeln(std::string msg);
        void writes(const char *msg);
        void writesn(const char *msg, size_t n);
        void writes(std::string msg);
        void writec(const char chr);
        void vwritef(const char *fmt, va_list args);
        void writef(const char *fmt, ...);
        void vwritefln(const char *fmt, va_list args);
        void writefln(const char *fmt, ...);
        LogStream(std::initializer_list<std::string> names, std::initializer_list<LogStream*> streams, int log_level = 0);

#ifdef __ANDROID__
        LogStream(std::initializer_list<std::string> names, std::initializer_list<std::variant<FILE*, android_LogPriority>> outputs, int log_level = 0);
#else
        LogStream(std::initializer_list<std::string> names, std::initializer_list<FILE*> outputs, int log_level = 0);
#endif
    };
    void init_logging();
    LogStream &get_log_stream_by_level(int level);
    #define DEBUG (Looper::Log::get_log_stream_by_level(-1))
    #define INFO (Looper::Log::get_log_stream_by_level(0))
    #define WARNING (Looper::Log::get_log_stream_by_level(1))
    #define ERROR (Looper::Log::get_log_stream_by_level(2))

}