NAME
    App::linerange - Retrieve line ranges from a filehandle

VERSION
    This document describes version 0.002 of App::linerange (from Perl
    distribution App-linerange), released on 2019-03-20.

FUNCTIONS
  linerange
    Usage:

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

    Retrieve line ranges from a filehandle.

    Examples:

    *   Get lines 1-10:

         linerange(spec => "1-10");

    *   Get lines 1 to 10, .. is synonym for -:

         linerange(spec => "1 .. 10");

    *   Get lines 1-10 as well as 21-30:

         linerange(spec => "1-10, 21 - 30");

    *   You can specify negative number, get the 5th line until 2nd last:

         linerange(spec => "5 .. -2");

    *   You can specify negative number, get the 10th last until last:

         linerange(spec => "-10 .. -1");

    The routine performs a single pass on the filehandle, retrieving
    specified line ranges.

    This function is not exported by default, but exportable.

    Arguments ('*' denotes required arguments):

    *   fh* => *filehandle*

    *   spec* => *str*

        Line range specification.

        A comma-separated list of line numbers ("N") or line ranges
        ("N1..N2" or "N1-N2", or "N1+M" which means N2 is set to N1+M-1),
        where N, N1, and N2 are line number specification. Line number
        begins at 1; it can also be a negative integer (-1 means the last
        line, -2 means second last, and so on). N1..N2 is the same as
        N2..N1.

        Examples:

        *   3 (third line)

        *   1..5 (first to fifth line)

        *   3+0 (third line)

        *   3+1 (third to fourth line)

        *   -3+1 (third last to fourth last)

        *   5..1 (first to fifth line)

        *   -5..-1 (fifth last to last line)

        *   -1..-5 (fifth last to last line)

        *   5..-3 (fifth line to third last)

        *   -3..5 (fifth line to third last)

    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)

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/App-linerange>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-App-linerange>.

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

    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.

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2019 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.

