move a few tools to a more central utility cli

tools/cli/main.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"maps"
+	"os"
+	"slices"
+
+	"github.com/admin-else/strom/tools/cli/offline_uuid"
+	"github.com/admin-else/strom/tools/cli/print_nbt"
+)
+
+var ExpectedASubcommandErr = errors.New("expected a subcommand")
+var UnknownSubcommandErr = errors.New("unknown subcommand")
+
+var subcommands = map[string]func(args []string) error{
+	"offline-uuid": offline_uuid.Run,
+	"print-nbt":    print_nbt.Run,
+}
+
+func Help(args []string) (err error) {
+	fmt.Println("Available subcommands", slices.Collect(maps.Keys(subcommands)))
+	return
+}
+
+func mainE() (err error) {
+	subcommands["help"] = Help // this is here because if it isn't tools/cli/main.go:17:5: initialization cycle for subcommands
+	//	tools/cli/main.go:17:5: subcommands refers to Help
+	//	tools/cli/main.go:22:6: Help refers to subcommands
+
+	if len(os.Args) < 2 {
+		err = ExpectedASubcommandErr
+		return
+	}
+
+	f, ok := subcommands[os.Args[1]]
+	if !ok {
+		err = UnknownSubcommandErr
+		return
+	}
+	err = f(os.Args[2:])
+	return
+}
+
+func main() {
+	err := mainE()
+	if err != nil {
+		slog.Error("exiting", "err", err)
+	}
+}

tools/cli/offline_uuid/offline_uuid.go

@@ -0,0 +1,20 @@
+package offline_uuid
+
+import (
+	"flag"
+	"fmt"
+
+	"github.com/admin-else/strom/crypto"
+)
+
+var cmd = flag.NewFlagSet("offline-uuid", flag.ContinueOnError)
+var nameFlag = cmd.String("name", "Notch", "name of the player")
+
+func Run(args []string) (err error) {
+	err = cmd.Parse(args)
+	if err != nil {
+		return
+	}
+	fmt.Println(crypto.FromOfflinePlayer(*nameFlag))
+	return
+}

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
+}

tools/cli/status/main.go

@@ -0,0 +1,32 @@
+package status
+
+import (
+	"flag"
+	"fmt"
+
+	"github.com/admin-else/strom/client"
+)
+
+var cmd = flag.NewFlagSet("status", flag.ContinueOnError)
+var addrFlag = flag.String("addr", "localhost:25565", "address to connect to")
+var srvFlag = flag.Bool("srv", false, "use SRV records to resolve the address")
+
+func Run(args []string) (err error) {
+	err = cmd.Parse(args)
+	if err != nil {
+		return
+	}
+	if *srvFlag {
+		*addrFlag, err = client.DoDNS(*addrFlag)
+		if err != nil {
+			return
+		}
+	}
+
+	status, err := client.StatusRaw(*addrFlag)
+	if err != nil {
+		return
+	}
+	fmt.Println(status)
+	return
+}