main.go

package main

import (
	"os"
	"time"

	"github.com/grafov/kiwi"
)

func main() {
	// Bind a new logger to a variable. You may create any number of loggers.
	log := kiwi.New()

	// For starting write log records to some writer output should be initialized.
	out := kiwi.SinkTo(os.Stdout, kiwi.AsLogfmt()).Start()

	// setup context of the logger
	log.With("userID", 1000, "host", "local", "startedAt", time.Now())

	// This record will be supplemented by startedAt value of time.Now().String()
	log.Add("sample", 1).Log()

	// This record also will be supplemented by the same value of the time.
	// Because context value evalueted when it was added by log.With().
	log.Add("sample", 2).Log()

	// You can provide deferred evaluation of context or log values if you add them wrapped
	// with func() interface{}, where interface should be one of scalar golang types.
	log.With("currentTime", func() string { return time.Now().String() })

	// These records will be output each its own currentTime value because currentTime will
	// be evaluated on each Log() call.
	log.Log("sample", 3)
	log.Log("sample", 4)
	out.Flush()
}