NAME

    Env::ShellWords - Environment variables for arguments as array

VERSION

    version 0.02

SYNOPSIS

     # Tie Interface
     use Env::ShellWords;
     tie my @CFLAGS,  'Env::ShellWords', 'CFLAGS';
     tie my @LDFLAGS, 'Env::ShellWords', 'LDFLAGS';
    
     # same thing with import interface:
     use Env::ShellWords qw( @CFLAGS @LDFLAGS );
    
     # usage:
     $ENV{CFLAGS} = '-DBAR=1';
     unshift @CFLAGS, '-I/foo/include';
     push @CFLAGS, '-DFOO=Define With Spaces';
     
     # now:
     # $ENV{CFLAGS} = '-I/foo/include -DBAR=1 -DFOO=Define\\ With\\ Spaces';
     
     unshift @LDFLAGS, '-L/foo/lib';
     push @LDFLAGS, '-lfoo';

DESCRIPTION

    This module provides an array like interface to environment variables
    that contain flags. For example Autoconf can uses the environment
    variables like CFLAGS or LDFLAGS, and this allows you to manipulate
    those variables without doing space quoting and other messy mucky
    stuff.

    The intent is to use this from alienfile to deal with hierarchical
    prerequisites.

    You can provide split and join callbacks when you tie:

     use Env::ShellWords;
     # split on any space, ignore quotes
     tie my @FOO, 'Env::ShellWords',
       sub { split /\s+/, $_[0] },
       sub { join ' ', @_ };

    Which may be useful if you have to split on words on an operating
    system with a different specification.

CAVEATS

    Not especially fast. undef gets mapped to the empty string '' since
    undef doesn't have a meaning as an argument in a string.

    Writing to an environment variable using this interface is inherently
    lossy.

SEE ALSO

    Env

AUTHOR

    Graham Ollis <plicease@cpan.org>

COPYRIGHT AND LICENSE

    This software is copyright (c) 2017 by Graham Ollis.

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

