Platform independent command line argument parsing helpers There are two kind of elements provided by this class Named parameters, accessed by param_get and param_has methods * --named-parameter * --parameter with_value * -a val Positional arguments, accessed by zargs_first, zargs_next It DOES: * provide easy to use CLASS compatible API for accessing argv * is platform independent * provide getopt_long style -- argument, which delimits parameters from arguments * makes parameters position independent It does NOT * change argv * provide a "declarative" way to define command line interface In future it SHALL * hide several formats of command line to one (-Idir, --include=dir, --include dir are the same from API pov) Create a new zargs from command line arguments. Destroy zargs instance. Return program name (argv[0]) Return number of positional arguments Return first positional argument or NULL Return next positional argument or NULL Return first named parameter value, or NULL if there are no named parameters, or value for which zargs_param_empty (arg) returns true. Return next named parameter value, or NULL if there are no named parameters, or value for which zargs_param_empty (arg) returns true. Return current parameter name, or NULL if there are no named parameters. Return value of named parameter or NULL is it has no value (or was not specified) Return value of one of parameter(s) or NULL is it has no value (or was not specified) Returns true if named parameter was specified on command line Returns true if named parameter(s) was specified on command line Print an instance of zargs.