Concept

Realization of slog handlers for filtering logs and coloring logs

Usecase

Defining the slog.Logger -> integrate handler

handler := slogslav.NewFilterTextHandler(os.Stdout, nil, nil)
logger := slog.New(handler)

// common logger using

Interface:

func NewFilterTextHandler(w io.Writer, opts *slog.HandlerOptions, level slog.Level) *FilterHandler {}
func NewFilterJSONHandler(w io.Writer, opts *slog.HandlerOptions, level slog.Level) *FilterHandler {}
func NewColorfulTextHandler(out io.Writer, formatter ColorFormatter, handlerOpts *slog.HandlerOptions) *ColorfulHandler {}

Individualizing the logs

Use ColorFormatter

type ColorFormatter interface {
	Err(level slog.Level) string
	Warn(level slog.Level) string
	Debug(level slog.Level) string
	Info(level slog.Level) string
	Time(logtime string) string
	Separator() string
}

Err, Warn, Debug, Info, Time, Separator - are used in writing into io.Writer interface. Anything that implements this interface may be used as ColorFormatter
The default implementation is ColorFormatterPalette

type ColorFormatterPalette struct {
	err       *color.Color
	warn      *color.Color
	debug     *color.Color
	info      *color.Color
	time      *color.Color
	separator byte
}

It uses fatih/color

Use HandlerOptions

Described in slog manuals