1Env::ShellWords(3)    User Contributed Perl Documentation   Env::ShellWords(3)
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NAME

6       Env::ShellWords - Environment variables for arguments as array
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VERSION

9       version 0.02
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SYNOPSIS

12        # Tie Interface
13        use Env::ShellWords;
14        tie my @CFLAGS,  'Env::ShellWords', 'CFLAGS';
15        tie my @LDFLAGS, 'Env::ShellWords', 'LDFLAGS';
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17        # same thing with import interface:
18        use Env::ShellWords qw( @CFLAGS @LDFLAGS );
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20        # usage:
21        $ENV{CFLAGS} = '-DBAR=1';
22        unshift @CFLAGS, '-I/foo/include';
23        push @CFLAGS, '-DFOO=Define With Spaces';
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25        # now:
26        # $ENV{CFLAGS} = '-I/foo/include -DBAR=1 -DFOO=Define\\ With\\ Spaces';
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28        unshift @LDFLAGS, '-L/foo/lib';
29        push @LDFLAGS, '-lfoo';
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DESCRIPTION

32       This module provides an array like interface to environment variables
33       that contain flags.  For example Autoconf can uses the environment
34       variables like "CFLAGS" or "LDFLAGS", and this allows you to manipulate
35       those variables without doing space quoting and other messy mucky
36       stuff.
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38       The intent is to use this from alienfile to deal with hierarchical
39       prerequisites.
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41       You can provide split and join callbacks when you tie:
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43        use Env::ShellWords;
44        # split on any space, ignore quotes
45        tie my @FOO, 'Env::ShellWords',
46          sub { split /\s+/, $_[0] },
47          sub { join ' ', @_ };
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49       Which may be useful if you have to split on words on an operating
50       system with a different specification.
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CAVEATS

53       Not especially fast.  "undef" gets mapped to the empty string '' since
54       "undef" doesn't have a meaning as an argument in a string.
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56       Writing to an environment variable using this interface is inherently
57       lossy.
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SEE ALSO

60       Env
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AUTHOR

63       Graham Ollis <plicease@cpan.org>
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66       This software is copyright (c) 2017 by Graham Ollis.
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68       This is free software; you can redistribute it and/or modify it under
69       the same terms as the Perl 5 programming language system itself.
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73perl v5.34.0                      2022-01-21                Env::ShellWords(3)
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