log

var (
	// DebugFunc logs a message as debug.
	// Set to nil if you want debug logs are ignored.
	DebugFunc = func(format string, v ...any) {
		format = "[DEBUG] vex: " + format
		stdlog.Printf(format, v...)
	}

	// InfoFunc logs a message as info.
	// Set to nil if you want info logs are ignored.
	InfoFunc = func(format string, v ...any) {
		format = "[INFO] vex: " + format
		stdlog.Printf(format, v...)
	}

	// ErrorFunc logs a message as error.
	// Set to nil if you want error logs are ignored.
	ErrorFunc = func(err error, format string, v ...any) {
		format = "[ERROR] vex: " + format + ": %+v"
		stdlog.Printf(format, append(v, err)...)
	}
)