add small tool that plays a sound when item passing the filter is found in the ground

cmd/itemwatcher/main.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"context"
+	itemwatcher "github.com/hectorgimenez/d2go/cmd/itemwatcher/internal"
+	"github.com/hectorgimenez/d2go/pkg/memory"
+	"github.com/hectorgimenez/d2go/pkg/nip"
+	"log"
+	"os"
+	"os/signal"
+)
+
+func main() {
+	process, err := memory.NewProcess()
+	if err != nil {
+		log.Fatalf("error starting process: %s", err.Error())
+	}
+
+	gr := memory.NewGameReader(process)
+
+	rules, err := nip.ReadDir("config/itemfilter/")
+	if err != nil {
+		log.Fatalf("error reading NIP files: %s", err.Error())
+	}
+
+	watcher := itemwatcher.NewWatcher(gr, rules)
+
+	ctx := contextWithSigterm(context.Background())
+	err = watcher.Start(ctx)
+	if err != nil {
+		log.Fatalf("error during process: %s", err.Error())
+	}
+}
+
+func contextWithSigterm(ctx context.Context) context.Context {
+	ctxWithCancel, cancel := context.WithCancel(ctx)
+	go func() {
+		defer cancel()
+
+		signalCh := make(chan os.Signal, 1)
+		signal.Notify(signalCh, os.Interrupt)
+
+		select {
+		case <-signalCh:
+		case <-ctx.Done():
+		}
+	}()
+
+	return ctxWithCancel
+}