NAME
    Getopt::Long::EvenLess - Like Getopt::Long::Less, but with even less
    features

VERSION
    This document describes version 0.110 of Getopt::Long::EvenLess (from
    Perl distribution Getopt-Long-EvenLess), released on 2017-08-09.

DESCRIPTION
    This module (GLEL for short) is a reimplementation of Getopt::Long (GL
    for short), but with much less features. It's an even more stripped down
    version of Getopt::Long::Less (GLL for short) and is perhaps less
    convenient to use for day-to-day scripting work.

    The main goal is minimum amount of code and small startup overhead. This
    module is an experiment of how little code I can use to support the
    stuffs I usually do with GL.

    Compared to GL and GLL, it:

    *   has minimum Configure() support

        Only these configurations are known: pass_through, no_pass_through
        (default).

        GLEL is equivalent to GL in this mode: bundling, no_ignore_case,
        no_getopt_compat, gnu_compat, permute.

        No support for configuring via import options e.g.:

         use Getopt::Long qw(:config pass_through);

    *   does not support increment ("foo+")

    *   no type checking ("foo=i", "foo=f", "foo=s" all accept any string)

    *   does not support optional value ("foo:s"), only no value ("foo") or
        required value ("foo=s")

    *   does not support desttypes ("foo=s@")

    *   does not support handler other than coderef (so no ""foo=s" =>
        \$scalar", ""foo=s" => \@ary", only ""foo=s" => sub { ... }")

        Also, in coderef handler, code will get a simple hash instead of a
        "callback" object as its first argument.

    *   does not support hashref as first argument

    *   does not support bool/negation (no "foo!", so you have to declare
        both "foo" and "no-foo" manually)

    The result?

    Amount of code. GLEL 0.07 is about 175 lines of code, while GL is about
    1500. Sure, if you *really* want to be minimalistic, you can use this
    single line of code to get options:

     @ARGV = grep { /^--([^=]+)(=(.*))?/ ? ($opts{$1} = $2 ? $3 : 1, 0) : 1 } @ARGV;

    and you're already able to extract "--flag" or "--opt=val" from @ARGV
    but you also lose a lot of stuffs like autoabbreviation, "--opt val"
    syntax support syntax (which is more common, but requires you specify an
    option spec), custom handler, etc.

    Startup overhead. Here's a sample startup overhead benchmark:

                                Rate        run_gl     load_gl load_gl_evenless run_gl_evenless run_gl_less load_gl_less   perl
     run_gl            63.92+-0.13/s            --       -1.1%           -69.5%          -69.5%      -70.2%       -70.7% -90.8%
     load_gl           64.65+-0.15/s   1.15+-0.31%          --           -69.1%          -69.2%      -69.8%       -70.3% -90.7%
     load_gl_evenless  209.55+-0.6/s   227.8+-1.1% 224.1+-1.2%               --           -0.2%       -2.2%        -3.9% -69.9%
     run_gl_evenless  209.88+-0.53/s   228.3+-1.1% 224.6+-1.1%      0.16+-0.38%              --       -2.1%        -3.7% -69.9%
     run_gl_less      214.29+-0.47/s 235.24+-0.99% 231.4+-1.1%      2.27+-0.37%      2.1+-0.34%          --        -1.7% -69.3%
     load_gl_less     217.98+-0.57/s     241+-1.1% 237.1+-1.2%       4.03+-0.4%     3.86+-0.38% 1.72+-0.35%           -- -68.7%
     perl               696.9+-2.1/s   990.3+-3.9% 977.9+-4.1%      232.6+-1.4%     232.1+-1.3% 225.2+-1.2%  219.7+-1.3%     --
 
     Average times:
       perl            :     1.4349ms
       load_gl_less    :     4.5876ms
       run_gl_less     :     4.6666ms
       run_gl_evenless :     4.7646ms
       load_gl_evenless:     4.7721ms
       load_gl         :    15.4679ms
       run_gl          :    15.6446ms

FUNCTIONS
  Configure(@configs | \%config) => hash
    Set configuration. Known configurations:

    *   pass_through

        Ignore errors (unknown/ambiguous option) and still make GetOptions
        return true.

    *   no_pass_through (default)

    Return old configuration data. To restore old configuration data you can
    pass it back to "Configure()", e.g.:

     my $orig_conf = Getopt::Long::EvenLess::Configure("pass_through");
     # ...
     Getopt::Long::EvenLess::Configure($orig_conf);

  GetOptions(%spec) => bool
    Shortcut for:

     GetOptionsFromArray(\@ARGV, %spec)

  GetOptionsFromArray(\@ary, %spec) => bool
    Get (and strip) options from @ary. Return true on success or false on
    failure (unknown option, etc).

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Getopt-Long-EvenLess>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Getopt-Long-EvenLess>.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Getopt-Long-EvenLess>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.

SEE ALSO
    Getopt::Long

    Getopt::Long::Less

    If you want *more* features intead of less, try Getopt::Long::More.

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2017, 2016, 2015 by perlancar@cpan.org.

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