First stab at maglevc

cmd/maglevc/main.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2026, Pim van Pelt <pim@ipng.ch>
+
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+
+	"git.ipng.ch/ipng/vpp-maglev/internal/grpcapi"
+)
+
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run() error {
+	serverAddr := flag.String("server", "localhost:9090", "maglev server address")
+	flag.Parse()
+
+	conn, err := grpc.NewClient(*serverAddr,
+		grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		return fmt.Errorf("connect %s: %w", *serverAddr, err)
+	}
+	defer conn.Close()
+
+	client := grpcapi.NewMaglevClient(conn)
+	ctx := context.Background()
+
+	args := flag.Args()
+	if len(args) == 0 {
+		// Interactive shell.
+		return runShell(ctx, client)
+	}
+
+	// One-shot command from CLI arguments.
+	root := buildTree()
+	tokens := splitTokens(strings.Join(args, " "))
+	return dispatch(ctx, root, client, tokens)
+}