NAME
    Sub::Spec::GetArgs::Argv - Get subroutine arguments from command line
    arguments (@ARGV)

VERSION
    version 0.04

SYNOPSIS
     use Sub::Spec::GetArgs::Argv;

     my $res = get_args_from_argv(argv=>\@ARGV, spec=>$spec, ...);

DESCRIPTION
    This module provides get_args_from_argv(), which parses command line
    arguments (@ARGV) into subroutine arguments (%args). This module is used
    by Sub::Spec::CmdLine.

    This module uses Log::Any for logging framework.

    This module's functions has Sub::Spec specs.

FUNCTIONS
    None are exported by default, but they are exportable.

  get_args_from_argv(%args) -> RESULT
    Get subroutine arguments (%args) from command-line arguments (@ARGV).

    Using information in sub spec's ~args~ clause, parse command line
    arguments ~@argv~ into hash ~%args~, suitable for passing into subs.

    Uses Getopt::Long's GetOptions to parse the result.

    As with GetOptions, this function modifies its ~argv~ argument.

    Why would one use this function instead of using Getopt::Long directly?
    Among other reasons, we want YAML parsing (ability to pass data
    structures via command line) and parsing of arg_pos and arg_greedy.

    * How this routine translates the args spec clause

    Bool types can be specified using:

    : --ARGNAME

    or

    : --noARGNAME

    All the other types can be specified using:

    : --ARGNAME VALUE

    or

    : --ARGNAME=VALUE

    VALUE will be parsed as YAML for nonscalar types (hash, array). If you
    want to force YAML parsing for scalar types (e.g. when you want to
    specify undef, *~* in YAML) you can use:

    : --ARGNAME-yaml=VALUE

    but you need to set *per_arg_yaml* to true.

    Argument aliases (~arg_aliases~) clause for each argument is also
    parsed. For example:

    : args => { : argname => [bool => { : summary => '...', : arg_aliases =>
    { : a => {}, : arg => {}, : }, : } : }

    Then -a and --arg are also available in addition to --argname.

    This function also (using [[cpanmod:Sub::Spec::GetArgs::Array]]) groks
    ~arg_pos~ and ~arg_greedy~ type clause, for example:

    : $SPEC{multiply2} = { : summary => 'Multiply 2 numbers (a & b)', : args
    => { : a => ['num*' => {arg_pos=>0}], : b => ['num*' => {arg_pos=>1}], :
    } : }

    then on the command-line any of below is valid:

    : % multiply2 --a 2 --b 3 : % multiply2 2 --b 3; # first non-option
    argument is fed into a (arg_pos=0) : % multiply2 2 3; # first argument
    is fed into a, second into b (arg_pos=1)

    Arguments ("*" denotes required arguments):

    *   argv* => *array*

    *   extra_getopts => *hash*

        Specify extra Getopt::Long specification.

        If specified, add extra Getopt::Long specification (as long as it
        doesn't clash with spec arg). This is used, for example, by
        Sub::Spec::CmdLine::run() to add general options --help, --version,
        --list, etc so it can mixed with spec arg options, for convenience.

    *   per_arg_yaml => *bool* (default 0)

        Whether to recognize --ARGNAME-yaml.

        This is useful for example if you want to specify a value which is
        not expressible from the command-line, like *undef*.

        : script.pl --name-yaml '~'

    *   spec* => *hash*

    *   strict => *bool* (default 1)

        Strict mode.

        If set to 0, will still return parsed argv even if there are parsing
        errors. If set to 1 (the default), will die upon error.

        Normally you would want to use strict mode, for more error checking.
        Setting off strict is used by, for example, Sub::Spec::BashComplete.

FAQ
SEE ALSO
    Sub::Spec

    Sub::Spec::CmdLine

AUTHOR
    Steven Haryanto <stevenharyanto@gmail.com>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2011 by Steven Haryanto.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.