Added back a command handling in parseArguments().

cmd/mccl/main.go

@@ -134,6 +134,39 @@ func parseArguments(args []string) (parsed arguments, err error) {
 	parsed.Uuid = "00000000-0000-0000-0000-000000000000"
 
 	for i := 0; i < len(args); i++ {
+		if args[i][0] != '-' {
+			if parsed.Command != "" {
+				return parsed, fmt.Errorf("there is already a command %s, but a second one (%s) was provided",
+					parsed.Command, args[i])
+			}
+			parsed.Command = args[i]
+			switch parsed.Command {
+			case "i":
+				fallthrough
+			case "install":
+				fallthrough
+			case "r":
+				fallthrough
+			case "run":
+				if i+3 > len(args) || args[i+1][0] == '-' {
+					return parsed, fmt.Errorf("a command %s is missing its version and directory arguments",
+						parsed.Command)
+				}
+				parsed.GameVersion = args[i+1]
+				parsed.Directory = args[i+2]
+				i += 2
+			case "l":
+				fallthrough
+			case "list":
+				if i+1 >= len(args) || args[i+1][0] == '-' {
+					return parsed, fmt.Errorf("a command list is missing its directory argument")
+				}
+				parsed.Directory = args[i+1]
+				i++
+			}
+			continue
+		}
+
 		switch args[i] {
 		case "-v":
 			fallthrough