NAME

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

VERSION

version 0.14

SYNOPSIS

use Perinci::Sub::GetArgs::Argv;

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

DESCRIPTION

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

This module uses Log::Any for logging framework.

This module has Rinci metadata.

FAQ

SEE ALSO

Perinci

FUNCTIONS

get_args_from_argv(%args) -> [status, msg, result, meta]

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

Using information in function metadata's 'args' property, 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 pos and greedy.

• How this routine uses the 'args' property

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 'perargyaml' to true.

This function also (using Perinci::Sub::GetArgs::Array) groks 'pos' and 'greedy' argument specification, for example:

$SPEC{multiply2} = {
    v => 1.1,
    summary => 'Multiply 2 numbers (a & b)',
    args => {
        a => ['num*' => {pos=>0}],
        b => ['num*' => {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 (pos=0)
% multiply2 2 3;     # first argument is fed into a, second into b (pos=1)

Arguments ('*' denotes required arguments):

• argv* => array

  If not specified, defaults to @ARGV

• 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 Perinci::CmdLine::run() to add general options --help, --version, --list, etc so it can mixed with spec arg options, for convenience.

• meta* => hash

• 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 '~'

• 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, Perinci::BashComplete.

Return value:

Returns an enveloped result (an array). First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (result) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

AUTHOR

Steven Haryanto <stevenharyanto@gmail.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2012 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.

cpanm Perinci::Sub::GetArgs::Argv

perl -MCPAN -e shell
install Perinci::Sub::GetArgs::Argv