NAME

Data::Unixish::chain - Chain several dux functions together

VERSION

This document describes version 1.574 of Data::Unixish::chain (from Perl distribution Data-Unixish), released on 2025-02-24.

SYNOPSIS

In Perl:

            

              
              
use Data::Unixish qw(lduxl);
my @res = lduxl([chain => {functions => ['date', ["ANSI::color" => {color=>"yellow"}]]}], 1000, 2000);
            
          

In command-line:

            

              
              
% echo -e "1000\n2000" | dux chain --functions-json '["date", ["ANSI::color",{"color":"yellow"}]]'
2
3
4
            
          

FUNCTIONS

chain

Usage:

            

              
              
chain(%args) -> [$status_code, $reason, $payload, \%result_meta]
            
          

Chain several dux functions together.

Currently works for itemfunc only.

See also the Data::Unixish::Apply function, which is related.

This function is not exported.

Arguments ('*' denotes required arguments):

• functions* => array[str|array]

  The functions to chain.

  Each element must either be function name (like date) or a 2-element array containing the function name and its arguments (like [bool, {style: dot}]).

• in => array

  Input stream (e.g. array or filehandle).

• out => any

  Output stream (e.g. array or filehandle).

Returns an enveloped result (an array).

First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata.

Return value: (any)

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Data-Unixish.

SOURCE

Source repository is at https://github.com/perlancar/perl-Data-Unixish.

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

            

              
              
% prove -l
            
          

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE

This software is copyright (c) 2025 by perlancar <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.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Data-Unixish

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.

cpanm Data::Unixish

perl -MCPAN -e shell
install Data::Unixish