package context

import (
	"context"
	"os"
	"os/signal"
	"syscall"
)

func SelfCancelingContextFromBackground() (context.Context, context.CancelFunc) {
	return SelfCancelingContext(context.Background())
}

func SelfCancelingContext(ctx context.Context) (context.Context, context.CancelFunc) {
	c, done := context.WithCancel(ctx)
	ch := make(chan os.Signal, 1)
	signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
	go func() {
		for range ch {
			done()
		}
	}()

	return c, done
}