examples_test.go

package splitslog_test

import (
	"log/slog"
	"os"

	"atomicgo.dev/splitslog"
)

func Example_demo() {
	splitter := splitslog.Splitter{
		// Debug and info messages are printed to stdout.
		slog.LevelDebug: slog.NewJSONHandler(os.Stdout, nil),
		slog.LevelInfo:  slog.NewJSONHandler(os.Stdout, nil),

		// Warn and error messages are printed to stderr.
		slog.LevelWarn:  slog.NewJSONHandler(os.Stderr, nil),
		slog.LevelError: slog.NewJSONHandler(os.Stderr, nil),
	}

	handler := splitslog.NewSplitHandler(splitter)
	logger := slog.New(handler)

	logger.Info("info message prints to stdout")
	logger.Error("error message prints to stderr")

	// stdout: {"time":"2023-09-07T16:56:22.563817+02:00","level":"INFO","msg":"info message prints to stdout"}
	// stderr: {"time":"2023-09-07T16:56:22.564103+02:00","level":"ERROR","msg":"error message prints to stderr"}
}

func ExampleNewSplitHandler() {
	splitter := splitslog.Splitter{
		// Debug and info messages are printed to stdout.
		slog.LevelDebug: slog.NewJSONHandler(os.Stdout, nil),
		slog.LevelInfo:  slog.NewJSONHandler(os.Stdout, nil),

		// Warn and error messages are printed to stderr.
		slog.LevelWarn:  slog.NewJSONHandler(os.Stderr, nil),
		slog.LevelError: slog.NewJSONHandler(os.Stderr, nil),
	}

	handler := splitslog.NewSplitHandler(splitter)
	logger := slog.New(handler)

	logger.Info("info message prints to stdout")
	logger.Error("error message prints to stderr")

	// stdout: {"time":"2023-09-07T16:56:22.563817+02:00","level":"INFO","msg":"info message prints to stdout"}
	// stderr: {"time":"2023-09-07T16:56:22.564103+02:00","level":"ERROR","msg":"error message prints to stderr"}
}