Can I add a new Log-Level?

[mobergmann]

I just discovered this library and I want to integrate it into oure project. I asked myself if it possible to add a new log level, which I then can use like the default log-levels (like so spdlog::my_loglevel("Hello World"))? This is not a requirement, but it would be a nice to have.

When it is possible, I would also have to adjust the hierarchic of log levels, maybe add a custom color and probably add many more things, which I currently cannot imagine.

[tt4g]

If you want to add an API to the spdlog namespace, you have to edit the source files.

Any log level that is printed in the log message can be overridden by the macro.

spdlog/include/spdlog/tweakme.h

Lines 103 to 114 in ad0e89c

	///////////////////////////////////////////////////////////////////////////////
	// Uncomment to customize level names (e.g. "MY TRACE")
	//
	// #define SPDLOG_LEVEL_NAMES { "MY TRACE", "MY DEBUG", "MY INFO", "MY WARNING", "MY ERROR", "MY CRITICAL", "OFF" }
	///////////////////////////////////////////////////////////////////////////////
	///////////////////////////////////////////////////////////////////////////////
	// Uncomment to customize short level names (e.g. "MT")
	// These can be longer than one character.
	//
	// #define SPDLOG_SHORT_LEVEL_NAMES { "T", "D", "I", "W", "E", "C", "O" }
	///////////////////////////////////////////////////////////////////////////////

I'm not exactly sure what "adjust the hierarchic of log levels" means, but if you want to change the behavior when comparing log levels, change the number assigned to the log level.

spdlog/include/spdlog/common.h

Lines 198 to 222 in ad0e89c

	#define SPDLOG_LEVEL_TRACE 0
	#define SPDLOG_LEVEL_DEBUG 1
	#define SPDLOG_LEVEL_INFO 2
	#define SPDLOG_LEVEL_WARN 3
	#define SPDLOG_LEVEL_ERROR 4
	#define SPDLOG_LEVEL_CRITICAL 5
	#define SPDLOG_LEVEL_OFF 6
	#if !defined(SPDLOG_ACTIVE_LEVEL)
	# define SPDLOG_ACTIVE_LEVEL SPDLOG_LEVEL_INFO
	#endif
	// Log level enum
	namespace level {
	enum level_enum : int
	{
	trace = SPDLOG_LEVEL_TRACE,
	debug = SPDLOG_LEVEL_DEBUG,
	info = SPDLOG_LEVEL_INFO,
	warn = SPDLOG_LEVEL_WARN,
	err = SPDLOG_LEVEL_ERROR,
	critical = SPDLOG_LEVEL_CRITICAL,
	off = SPDLOG_LEVEL_OFF,
	n_levels
	};

See #2279 how to set up custom colors.

See also: #1794, #834

[mobergmann]

I mainly wanted to know if there is a convenient way to add a new log level. But editing the source files is not convenient. So I take this as a no, it is not possible. Thanks for the fast response 👍