move a few tools to a more central utility cli

tools/cli/print_nbt/main.go

@@ -0,0 +1,36 @@
+package print_nbt
+
+import (
+	"encoding/json"
+	"flag"
+	"os"
+
+	"github.com/admin-else/strom/nbt"
+)
+
+var (
+	cmd      = flag.NewFlagSet("print-nbt", flag.ContinueOnError)
+	FileFlag = cmd.String("file", "", "The NBT file to print")
+)
+
+func Run(args []string) (err error) {
+	err = cmd.Parse(args)
+	if err != nil {
+		return
+	}
+	f, err := os.Open(*FileFlag)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+	n, err := nbt.ReadFile(f)
+	if err != nil {
+		return
+	}
+	b, err := json.MarshalIndent(n, "", "  ")
+	if err != nil {
+		return
+	}
+	_, err = os.Stdout.Write(b)
+	return
+}