mod_fem_viewer/FemViewer/inc/Log.h

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#ifndef _FV_LOG_H_
#define _FV_LOG_H_

#ifdef PARALLEL
#include"pch_intf.h"
#endif
#include"uth_log.h"
#include<memory>
#include<cstdio>
#include<fstream>
#include<sstream>

namespace FemViewer {

    // Destination of messages
    enum {
        NOWERE     = 0x0000,  // nowhere
        LOGCONSOLE = 0x0001,  // direct messages to stdout/stderr
        LOGFILE    = 0x0010,  // direct messages to internal log file (at destructur write to file)
        LOGDIALOG  = 0x0100,  // direct messages to dialog window
        LOGEXTERNAL = 0x1000, // whether log messages are written to external or internal logfile
    };

    // Levels of messages
    enum eLevel {
        LogERROR = 0,       // log errors
        LogWARNING,         // log errors + warnings
        LogINFO,            // log error + warnings + infos
        LogDEBUG,           // + debug info 0
        LogDEBUG1,          // + debug info 1, etc
    };

    // Forward declaration
    class mfvWindow;

    class Log
    {
        static std::unique_ptr<Log> m_selfp;
        static const eLevel m_dfErrLevel;   // Default error level logginig
        static const int    m_dfLogDest;        // Default destination for log messages
        static FILE * m_dfLogFile;          // Handle to default logfile
        static FILE * m_dfLogConsole;   // Default log destinaltion console (stdout or stderr)

    public:
        static bool Init(FILE *fp = stdout,mfvWindow *dlgp = nullptr);
        static bool IsInit(void) { return m_selfp != nullptr; }
        static const eLevel& Level() { return m_dfErrLevel; }
        static void Destroy();
        static Log& GetInstance();
        ~Log();
        void Msg(const char* str);
        void SetMode(int mode);
        void SetLevel(eLevel level);
        void Close();

    protected:
        std::ostringstream m_log;
        int           m_mode;
        FILE*         m_consolep;
        FILE*         m_filep;
        mfvWindow*    m_dlgp;

        void StartLogToFile();
        void EndLogToFile();

    private:
        // Ctr
        Log(int mode,FILE* console,FILE* file,mfvWindow * dlgp);

        // These are not allowed
        Log(const Log& rhs);
        Log& operator=(const Log& rhs);

#ifdef PARALLEL
        int       _myprocid;
        int       _mymasterid;
        int (*logto)(const char* str);
        static int sendlog(const char* str);
        static int updatelog(const char* str);
#endif
    };

void log(const int level, const char *msg, ...);
// this macro is for showing only the filename, not full file path
#define MFP_FILE_NAME   MF_FILE_NAME
#ifdef NDEBUG
//#define mfp_log_err(M, ...)
//#define mfp_log_warn(M, ...)
//#define mfp_log_info(M, ...)
#define mfp_log_debug(M, ...)
#else
//#define mfp_log_err(M, ...)       log(FemViewer::LogERROR, "ERROR: " M "\n", ##__VA_ARGS__)
//#define mfp_log_warn(M, ...)  log(FemViewer::LogWARNING,"WARNING: " M "\n", ##__VA_ARGS__)
//#define mfp_log_info(M, ...)  log(FemViewer::LogINFO,"INFO: " M "\n", ##__VA_ARGS__)
#define mfp_log_debug(M, ...)   log(FemViewer::LogDEBUG, "DEBUG %s:%d: " M "\n",MFP_FILE_NAME, __LINE__, ##__VA_ARGS__)
#endif

#define mfp_log_err(M, ...)     log(FemViewer::LogERROR, "ERROR: " M "\n", ##__VA_ARGS__)
#define mfp_log_warn(M, ...)    log(FemViewer::LogWARNING,"WARNING: " M "\n", ##__VA_ARGS__)
#define mfp_log_info(M, ...)    log(FemViewer::LogINFO,"INFO: " M "\n", ##__VA_ARGS__)

#ifdef PARALLEL
    void printParallel(const char*, ...);
    void printSynchronizedParallel(const char*, ...);
#endif


}// end namespace FeemViewer


#endif

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