ulib parse boolean arguments

ulib/args/args.c

@@ -19,6 +19,9 @@ int32_t parse_args(char **argv, size_t argc, Arg *defs) {
               case ARG_STRING:
                 *((char **)def->ptr) = argv[i+1];
                 break;
+              case ARG_BOOL:
+                *((bool *)def->ptr) = string_strcmp(argv[i+1], "yes") == 0;
+                break;
             }
             i++;
           }