feat: new command line options

internal/cmd/main.go

@@ -0,0 +1,43 @@
+package cmd
+
+import (
+	"context"
+	"log"
+	"os"
+
+	"github.com/urfave/cli/v3"
+)
+
+func NewAppCmd() *cli.Command {
+	serve := false
+
+	cmd := &cli.Command{
+		Name:  "nginx-ui",
+		Usage: "Yet another Nginx Web UI",
+		Commands: []*cli.Command{
+			{
+				Name:  "serve",
+				Usage: "Start the Nginx-UI server",
+				Action: func(ctx context.Context, command *cli.Command) error {
+					serve = true
+					return nil
+				},
+			},
+		},
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:  "config",
+				Value: "app.ini",
+				Usage: "configuration file path",
+			},
+		},
+		DefaultCommand: "serve",
+	}
+
+	if err := cmd.Run(context.Background(), os.Args); err != nil {
+		log.Fatal(err)
+	} else if !serve {
+		os.Exit(0)
+	}
+	return cmd
+}