[MAN] zargs

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ZARGS

Section: CZMQ Manual (3)
Updated: 01/01/2018
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NAME

zargs - Class for Platform independent command line argument parsing helpers  

SYNOPSIS

//  This is a draft class, and may change without notice. It is disabled in
//  stable builds by default. If you use this in applications, please ask
//  for it to be pushed to stable state. Use --enable-drafts to enable.
#ifdef CZMQ_BUILD_DRAFT_API
//  *** Draft method, for development use, may change without warning ***
//  Create a new zargs from command line arguments.
CZMQ_EXPORT zargs_t *
    zargs_new (int argc, char **argv);

//  *** Draft method, for development use, may change without warning ***
//  Destroy zargs instance.
CZMQ_EXPORT void
    zargs_destroy (zargs_t **self_p);

//  *** Draft method, for development use, may change without warning ***
//  Return program name (argv[0])
CZMQ_EXPORT const char *
    zargs_progname (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return number of positional arguments
CZMQ_EXPORT size_t
    zargs_arguments (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return first positional argument or NULL
CZMQ_EXPORT const char *
    zargs_first (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return next positional argument or NULL
CZMQ_EXPORT const char *
    zargs_next (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return first named parameter value, or NULL if there are no named
//  parameters, or value for which zargs_param_empty (arg) returns true.
CZMQ_EXPORT const char *
    zargs_param_first (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return next named parameter value, or NULL if there are no named
//  parameters, or value for which zargs_param_empty (arg) returns true.
CZMQ_EXPORT const char *
    zargs_param_next (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return current parameter name, or NULL if there are no named
//  parameters.
CZMQ_EXPORT const char *
    zargs_param_name (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Return value of named parameter, NULL if no given parameter has
//  been specified, or special value for wich zargs_param_empty ()
//  returns true.
CZMQ_EXPORT const char *
    zargs_param_lookup (zargs_t *self, const char *keys);

//  *** Draft method, for development use, may change without warning ***
//  Return value of named parameter(s), NULL if no given parameter has
//  been specified, or special value for wich zargs_param_empty ()
//  returns true.
CZMQ_EXPORT const char *
    zargs_param_lookupx (zargs_t *self, const char *keys, ...);

//  *** Draft method, for development use, may change without warning ***
//  Returns true if there are --help -h arguments
CZMQ_EXPORT bool
    zargs_has_help (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Returns true if parameter did not have a value
CZMQ_EXPORT bool
    zargs_param_empty (const char *arg);

//  *** Draft method, for development use, may change without warning ***
//  Print an instance of zargs.
CZMQ_EXPORT void
    zargs_print (zargs_t *self);

//  *** Draft method, for development use, may change without warning ***
//  Self test of this class.
CZMQ_EXPORT void
    zargs_test (bool verbose);

#endif // CZMQ_BUILD_DRAFT_API
Please add '@interface' section in './../src/zargs.c'.

 

DESCRIPTION

zargs - Platform independent command line argument parsing helpers

Platform independent command line argument parsing helpers

There are two kind of elements provided by this class foo --named-parameter --parameter with_value positional arguments -a gain-parameter zargs keeps poision only for arguments, parameters are to be accessed like hash.

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 positon 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)

Please add @discuss section in ./../src/zargs.c.  

EXAMPLE

From zargs_test method.

//  Simple create/destroy test

char *argv1[] = {"progname", "--named1", "-n1", "val1", "positional1", "--with", "value", "--with2=value2", "-W3value3", "--", "--thisis", "considered", "positional", NULL};

zargs_t *self = zargs_new (13, argv1);
assert (self);

assert (streq (zargs_progname (self), "progname"));
assert (streq (zargs_first (self), "positional1"));
assert (streq (zargs_next (self), "--thisis"));
assert (streq (zargs_next (self), "considered"));
assert (streq (zargs_next (self), "positional"));
assert (!zargs_next (self));

assert (zargs_param_empty (zargs_param_lookup (self, "--named1")));
assert (!zargs_param_empty (zargs_param_lookup (self, "-n1")));
assert (streq (zargs_param_lookupx (self, "--not at all", "-n1", NULL), "val1"));
// TODO: this does not look like an easy hack w/o allocating extra memory
//       ???
//assert (streq (zargs_param_lookup (self, "--with", NULL), "value2"));

zargs_destroy (&self);

 

AUTHORS

The czmq manual was written by the authors in the AUTHORS file.  

RESOURCES

Main web site: m[blue]m[]

Report bugs to the email <m[blue]zeromq-dev@lists.zeromq.orgm[][1]>  

COPYRIGHT

Copyright (c) the Contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for 0MQ: http://czmq.zeromq.org. This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. LICENSE included with the czmq distribution.  

NOTES

1.

zeromq-dev@lists.zeromq.org

mailto:zeromq-dev@lists.zeromq.org

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Index

NAME

SYNOPSIS

DESCRIPTION

EXAMPLE

AUTHORS

RESOURCES

COPYRIGHT

NOTES

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Time: 04:45:37 GMT, September 16, 2022