NAME
    Data::Unixish - Implementation for Unixish, a data transformation
    framework

VERSION
    This document describes version 1.56 of Data::Unixish (from Perl
    distribution Data-Unixish), released on 2017-07-10.

SYNOPSIS
     # the a/f/l/c prefix determines whether function accepts
     # arrayref/file(handle)/list/callback as input. the a/f/l/c suffix determines
     # whether function returns an array, a list, a filehandle, or calls a callback.
     # If filehandle is chosen as output, a child process is forked to process input
     # as requested.

     use Data::Unixish qw(
                           aduxa cduxa fduxa lduxa
                           aduxc cduxc fduxc lduxc
                           aduxf cduxf fduxf lduxf
                           aduxl cduxl fduxl lduxl
                           siduxs
     ); # or you can use :all to export all functions

     # apply function, without argument
     my @out = lduxl('sort', 7, 2, 4, 1);  # => (1, 2, 4, 7)
     my $out = lduxa('uc', "a", "b", "c"); # => ["A", "B", "C"]
     my $res = fduxl('wc', "file.txt");    # => "12\n234\n2093" # like wc's output

     # apply function, with some arguments
     my $fh = fduxf([trunc => {width=>80, ansi=>1, mb=>1}], \*STDIN);
     say while <$fh>;

     # apply function to a single item, function must be itemfunc
     my $res = duxitem(, $item);

     # apply function to multiple items, function must be itemfunc
     my @res = aduxitem(, $item1, $item2, $item3);

DESCRIPTION
    This distribution implements Unixish, a data transformation framework
    inspired by Unix toolbox philosophy.

FUNCTIONS
    The functions are not exported by default. They can be exported
    individually or altogether using export tag ":all".

  aduxa($func, \@input) => ARRAYREF
  aduxc($func, $callback, \@input)
  aduxf($func, \@input) => FILEHANDLE
  aduxl($func, \@input) => LIST (OR SCALAR)
    The "adux*" functions accept an arrayref as input. $func is a string
    containing dux function name (if no arguments to the dux function is to
    be supplied), or "[$func, \%args]" to supply arguments to the dux
    function. Dux function name corresponds to module names
    "Data::Unixish::NAME" without the prefix.

    The *duxc functions will call the callback repeatedly with every output
    item.

    The *duxf functions returns filehandle immediately. A child process is
    forked, and dux function is run in the child process. You read output as
    lines from the returned filehandle. (Currently not yet supported on
    Windows due to no support for open '-|').

    The *duxl functions returns result as list. It can be evaluated in
    scalar to return only the first element of the list. However, the whole
    list will be calculated first. Use *duxf for streaming interface.

  cduxa($func, $icallback) => ARRAYREF
  cduxc($func, $icallback, $ocallback)
  cduxf($func, $icallback) => FILEHANDLE
  cduxl($func, $icallback) => LIST (OR SCALAR)
    The "cdux*" functions accepts a callback ($icallback) to get input
    elements from. Input callback function should return a list of one or
    more elements, or an empty list to signal end of stream.

    An example:

     cduxa($func, sub {
         state $a = [1,2,3,4];
         if (@$a) {
             return shift(@$a);
         } else {
             return ();
         }
     });

  fduxa($func, $file_or_handle, @args) => ARRAYREF
  fduxc($func, $callback, $file_or_handle, @args)
  fduxf($func, $file_or_handle, @args) => FILEHANDLE
  fduxl($func, $file_or_handle, @args) => LIST
    The "fdux*" functions accepts filename or filehandle. @args is optional
    and will be passed to Tie::File. Currently not yet supported on Windows.

  lduxa($func, @input) => ARRAYREF
  lduxc($func, $callback, @input)
  lduxf($func, @input) => FILEHANDLE
  lduxl($func, @input) => LIST
    The "ldux*" functions accepts list as input.

  siduxs($func, $item) => $res
  aiduxa($func, \@items) => ARRAYREF
  aiduxl($func, \@items) => LIST
  liduxa($func, @items) => ARRAYREF
  liduxl($func, @items) => LIST
    The "*idux*" functions apply dux function on single item(s). Only dux
    functions tagged with "itemfunc" can be used. These functions can
    operate on a single item and return a single result. Examples of
    itemfunc functions are "uc", "lc", "sprintf". Examples of non-itemfunc
    functions are "head", "tail", "wc".

    The "*idux*" functions can be useful if you want to call a dux function
    from another dux function for each item. For example, see
    "Data::Unixish::condapply".

FAQ
  I'm getting "Use of uninitialized value in push at lib/Data/Unixish/XXX.pm line XX." messages!
    This looks like a bug in perl 5.10.1 or earlier. Try upgrading to perl
    5.12 or later.

  How do I use the diamond operator as input?
    You can use Tie::Diamond, e.g.:

     use Tie::Diamond;
     tie my(@in), "Tie::Diamond";
     my $out = aduxa($func, \@in);

    Also see the dux command-line utility in the App::dux distribution which
    allows you to access dux function from the command-line.

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>.

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.

SEE ALSO
    Unixish

    dux script in App::dux

AUTHOR
    perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE
    This software is copyright (c) 2017, 2016, 2015, 2014, 2013, 2012 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.