Improve command loading

cmd/help.go

@@ -1,10 +1,25 @@
 package lumecmd
 
 import (
+	"flag"
 	"fmt"
 	"sort"
 )
 
+func NewCmdHelp() Command {
+	return Command{
+		Name: "help",
+		Func: HelpCmd,
+		Flags: func() *flag.FlagSet {
+			fs := flag.NewFlagSet("help", flag.ExitOnError)
+
+			return fs
+		}(),
+		Use:   "<command>",
+		Short: "Show help for a command",
+	}
+}
+
 func HelpCmd(args CmdArgs) (int, error) {
 	argv := args.Flags.Args()