Getopt::Long::Util - Utilities for Getopt::Long


This document describes version 0.892 of Getopt::Long::Util (from Perl distribution Getopt-Long-Util), released on 2020-10-27.




 detect_getopt_long_script(%args) -> [status, msg, payload, meta]

Detect whether a file is a Getopt::Long-based CLI script.

The criteria are:

  • the file must exist and readable;

  • (optional, if include_noexec is false) file must have its executable mode bit set;

  • content must start with a shebang #!;

  • either: must be perl script (shebang line contains 'perl') and must contain something like use Getopt::Long;

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • filename => str

    Path to file to be checked.

  • include_noexec => bool (default: 1)

    Include scripts that do not have +x mode bit set.

  • string => buf

    String to be checked.

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 (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)



 gen_getopt_long_spec_from_getopt_std_spec(%args) -> hash

Generate Getopt::Long spec from Getopt::Std spec.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • is_getopt => bool

    Whether to assume spec is for getopt() or getopts().

    By default spec is assumed to be for getopts() instead of getopt(). This means that for a spec like abc:, a and b don't take argument while c does. But if is_getopt is true, the meaning of : is reversed: a and b take arguments while c doesn't.

  • spec* => str

    Getopt::Std spec string.

Return value: (hash)



 humanize_getopt_long_opt_spec( [ \%optional_named_args ] , $optspec) -> str

Convert Getopt::Long option specification into a more human-friendly notation that is suitable for including in help/usage text, for example:

 help|h|?       ->  --help, -h, -?
 help|h|?       ->  --help | -h | -?  (if you provide 'separator')
 --foo=s        ->  --foo=s
 --foo=s        ->  --foo=somelabel  (if you provide 'value_label')
 --foo:s        ->  --foo[=s]
 --foo=s@       ->  --foo=s+
 --foo=s%       ->  --foo key=value
 --foo=s        ->  --foo=somelabel  (if you provide 'value_label')
 --debug!       ->  --(no)debug

Will die if can't parse the optspec string.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • key_label => str (default: "key")

  • $optspec* => str

  • separator => str (default: ", ")

  • value_label => str

Return value: (str)



 parse_getopt_long_opt_spec($optspec) -> hash

Parse a single Getopt::Long option specification.


  • Example #1:

     parse_getopt_long_opt_spec("help|h|?"); # -> { dash_prefix => "", opts => ["help", "h", "?"] }
  • Example #2:

     parse_getopt_long_opt_spec("--foo=s"); # -> { dash_prefix => "--", desttype => "", opts => ["foo"], type => "s" }

Will produce a hash with some keys:

  • is_arg (if true, then option specification is the special <> for argument callback)

  • opts (array of option names, in the order specified in the opt spec)

  • type (string, type name)

  • desttype (either '', or '@' or '%'),

  • is_neg (true for --opt!)

  • is_inc (true for --opt+)

  • min_vals (int, usually 0 or 1)

  • max_vals (int, usually 0 or 1 except for option that requires multiple values)

Will return undef if it can't parse the string.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • $optspec* => str

Return value: (hash)


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Getopt::Long::Spec, which can also parse Getopt::Long spec into hash as well as transform back the hash to Getopt::Long spec. OO interface. I should've found this module first before writing my own parse_getopt_long_opt_spec(). But at least currently parse_getopt_long_opt_spec() is at least about 30-100+% faster than Getopt::Long::Spec::Parser, has a much simpler implementation (a single regex match), and can handle valid Getopt::Long specs that Getopt::Long::Spec::Parser fails to parse, e.g. foo|f=s@.


perlancar <>


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