Custom pattern for log and severity level about spdlog

[tt4g]

But after this the log severity i.e., error, info etc become colorless. What should be the format so that everything remain same just milliseconds removed.

The default format has a color range %^ and %$: https://github.com/gabime/spdlog/wiki/3.-Custom-formatting

spdlog/include/spdlog/pattern_formatter-inl.h

Lines 884 to 890 in 8fed530

	dest.push_back('[');
	// wrap the level name with color
	msg.color_range_start = dest.size();
	// fmt_helper::append_string_view(level::to_c_str(msg.level), dest);
	fmt_helper::append_string_view(level::to_string_view(msg.level), dest);
	msg.color_range_end = dest.size();
	dest.push_back(']');

Add a color range to the log pattern.

-[%Y-%m-%d %H:%M:%S] [%l]
+[%Y-%m-%d %H:%M:%S] [%^%l%$]

Also I want custom name for severity like debug and error are 5 chars but warning is more, so if I wanted to restrict all of them to same number of character then how I can do that?

Define SPDLOG_LEVEL_NAMES macro:

spdlog/include/spdlog/tweakme.h

Lines 102 to 107 in 8fed530

	///////////////////////////////////////////////////////////////////////////////
	// 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" }
	///////////////////////////////////////////////////////////////////////////////

lso we can read the spdlog severity level from env var like this spdlog::cfg::load_env_levels(); but how I can check what is the log level using if condition. Like I wanted a specific logic to be running only if the log level is debug only.

I do not know where you want to get the log level.
Call spdlog::get_level() if you want a global log level for spdlog.
Duplicate #1854, #1357 if it is a custom sink.

Also how can I limit the float precision in spdlog?

The logging argument format uses fmt library.
See fmt API: https://fmt.dev/10.1.1/syntax.html

[greatsharma]

Thanks, this worked for me.