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


This document describes version 0.85 of Getopt::Long::Util (from Perl distribution Getopt-Long-Util), released on 2016-10-21.


detect_getopt_long_script(%args) -> [status, msg, result, 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.

    Either filename or string must be specified.

  • include_noexec => bool (default: 1)

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

  • string => buf

    Path to file to be checked.

    Either file or string must be specified.

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.

Return value: (any)

humanize_getopt_long_opt_spec($optspec) -> str

Convert Getopt::Long option specification like help|h|? or --foo=s or debug! into, respectively, --help, -h, -? or --foo=s or --(no)debug. Will die if can't parse the string. The output is suitable for including in help/usage text.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • $optspec* => 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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