Gecko [ paroquia-rio-de-mouro.pt ]

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Encode	[ DIR ]	drwxr-xr-x	2020-10-27 07:29
Exporter	[ DIR ]	drwxr-xr-x	2020-10-27 07:29
ExtUtils	[ DIR ]	drwxr-xr-x	2020-10-27 07:29
File	[ DIR ]	drwxr-xr-x	2020-10-27 07:29
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Net	[ DIR ]	drwxr-xr-x	2020-10-27 07:29
Params	[ DIR ]	drwxr-xr-x	2020-10-27 07:29
Parse	[ DIR ]	drwxr-xr-x	2016-11-15 15:18
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AnyDBM_File.pm	2.56 KB	-rw-r--r--	2020-10-19 12:57
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Carp.pm	19.6 KB	-rw-r--r--	2020-10-19 12:57
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Digest.pm	10.35 KB	-rw-r--r--	2020-10-19 12:57
DirHandle.pm	1.52 KB	-rw-r--r--	2020-10-19 12:57
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bigrat.pm	14.23 KB	-rw-r--r--	2020-10-19 12:57
blib.pm	2.04 KB	-rw-r--r--	2020-10-19 12:57
bytes.pm	447 B	-rw-r--r--	2020-10-19 12:57
bytes_heavy.pl	758 B	-rw-r--r--	2020-10-19 12:57
charnames.pm	20.5 KB	-rw-r--r--	2020-10-19 12:57
constant.pm	5.6 KB	-rw-r--r--	2020-10-19 12:57
deprecate.pm	3.43 KB	-rw-r--r--	2020-10-19 12:57
diagnostics.pm	18.26 KB	-rw-r--r--	2020-10-19 12:57
dumpvar.pl	15.19 KB	-rw-r--r--	2020-10-19 12:57
experimental.pm	5.39 KB	-rw-r--r--	2020-10-19 12:57
feature.pm	4.08 KB	-rw-r--r--	2020-10-19 12:57
fields.pm	4.87 KB	-rw-r--r--	2020-10-19 12:57
filetest.pm	3.91 KB	-rw-r--r--	2020-10-19 12:57
if.pm	2.98 KB	-rw-r--r--	2020-10-19 12:57
integer.pm	172 B	-rw-r--r--	2020-10-19 12:57
less.pm	3.13 KB	-rw-r--r--	2020-10-19 12:57
locale.pm	2.81 KB	-rw-r--r--	2020-10-19 12:57
meta_notation.pm	2.17 KB	-rw-r--r--	2020-10-19 12:57
ok.pm	968 B	-rw-r--r--	2020-10-19 12:57
open.pm	7.83 KB	-rw-r--r--	2020-10-19 12:57
overload.pm	4.36 KB	-rw-r--r--	2020-10-19 12:57
overloading.pm	964 B	-rw-r--r--	2020-10-19 12:57
parent.pm	607 B	-rw-r--r--	2020-10-19 12:57
perl5db.pl	308.3 KB	-rw-r--r--	2020-10-19 12:57
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subs.pm	848 B	-rw-r--r--	2020-10-19 12:57
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utf8_heavy.pl	31.25 KB	-rw-r--r--	2020-10-19 12:57
vars.pm	1.12 KB	-rw-r--r--	2020-10-19 12:57
version.pm	1.58 KB	-rw-r--r--	2020-10-19 12:57
version.pod	9.62 KB	-rw-r--r--	2020-10-19 12:57
vmsish.pm	4.21 KB	-rw-r--r--	2020-10-19 12:57
warnings.pm	21.49 KB	-rw-r--r--	2020-10-19 12:57

Rename

package Env;

our $VERSION = '1.04';

=head1 NAME

Env - perl module that imports environment variables as scalars or arrays

=head1 SYNOPSIS

use Env;
    use Env qw(PATH HOME TERM);
    use Env qw($SHELL @LD_LIBRARY_PATH);

=head1 DESCRIPTION

Perl maintains environment variables in a special hash named C<%ENV>.  For
when this access method is inconvenient, the Perl module C<Env> allows
environment variables to be treated as scalar or array variables.

The C<Env::import()> function ties environment variables with suitable
names to global Perl variables with the same names.  By default it
ties all existing environment variables (C<keys %ENV>) to scalars.  If
the C<import> function receives arguments, it takes them to be a list of
variables to tie; it's okay if they don't yet exist. The scalar type
prefix '$' is inferred for any element of this list not prefixed by '$'
or '@'. Arrays are implemented in terms of C<split> and C<join>, using
C<$Config::Config{path_sep}> as the delimiter.

After an environment variable is tied, merely use it like a normal variable.
You may access its value

@path = split(/:/, $PATH);
    print join("\n", @LD_LIBRARY_PATH), "\n";

or modify it

$PATH .= ":.";
    push @LD_LIBRARY_PATH, $dir;

however you'd like. Bear in mind, however, that each access to a tied array
variable requires splitting the environment variable's string anew.

The code:

use Env qw(@PATH);
    push @PATH, '.';

is equivalent to:

use Env qw(PATH);
    $PATH .= ":.";

except that if C<$ENV{PATH}> started out empty, the second approach leaves
it with the (odd) value "C<:.>", but the first approach leaves it with "C<.>".

To remove a tied environment variable from
the environment, assign it the undefined value

undef $PATH;
    undef @LD_LIBRARY_PATH;

=head1 LIMITATIONS

On VMS systems, arrays tied to environment variables are read-only. Attempting
to change anything will cause a warning.

=head1 AUTHOR

Chip Salzenberg E<lt>F<chip@fin.uucp>E<gt>
and
Gregor N. Purdy E<lt>F<gregor@focusresearch.com>E<gt>

=cut

sub import {
    my ($callpack) = caller(0);
    my $pack = shift;
    my @vars = grep /^[\$\@]?[A-Za-z_]\w*$/, (@_ ? @_ : keys(%ENV));
    return unless @vars;

@vars = map { m/^[\$\@]/ ? $_ : '$'.$_ } @vars;

eval "package $callpack; use vars qw(" . join(' ', @vars) . ")";
    die $@ if $@;
    foreach (@vars) {
	my ($type, $name) = m/^([\$\@])(.*)$/;
	if ($type eq '$') {
	    tie ${"${callpack}::$name"}, Env, $name;
	} else {
	    if ($^O eq 'VMS') {
		tie @{"${callpack}::$name"}, Env::Array::VMS, $name;
	    } else {
		tie @{"${callpack}::$name"}, Env::Array, $name;
	    }
	}
    }
}

sub TIESCALAR {
    bless \($_[1]);
}

sub FETCH {
    my ($self) = @_;
    $ENV{$$self};
}

sub STORE {
    my ($self, $value) = @_;
    if (defined($value)) {
	$ENV{$$self} = $value;
    } else {
	delete $ENV{$$self};
    }
}

######################################################################

package Env::Array;
 
use Config;
use Tie::Array;

@ISA = qw(Tie::Array);

my $sep = $Config::Config{path_sep};

sub TIEARRAY {
    bless \($_[1]);
}

sub FETCHSIZE {
    my ($self) = @_;
    return 1 + scalar(() = $ENV{$$self} =~ /\Q$sep\E/g);
}

sub STORESIZE {
    my ($self, $size) = @_;
    my @temp = split($sep, $ENV{$$self});
    $#temp = $size - 1;
    $ENV{$$self} = join($sep, @temp);
}

sub CLEAR {
    my ($self) = @_;
    $ENV{$$self} = '';
}

sub FETCH {
    my ($self, $index) = @_;
    return (split($sep, $ENV{$$self}))[$index];
}

sub STORE {
    my ($self, $index, $value) = @_;
    my @temp = split($sep, $ENV{$$self});
    $temp[$index] = $value;
    $ENV{$$self} = join($sep, @temp);
    return $value;
}

sub EXISTS {
    my ($self, $index) = @_;
    return $index < $self->FETCHSIZE;
}

sub DELETE {
    my ($self, $index) = @_;
    my @temp = split($sep, $ENV{$$self});
    my $value = splice(@temp, $index, 1, ());
    $ENV{$$self} = join($sep, @temp);
    return $value;
}

sub PUSH {
    my $self = shift;
    my @temp = split($sep, $ENV{$$self});
    push @temp, @_;
    $ENV{$$self} = join($sep, @temp);
    return scalar(@temp);
}

sub POP {
    my ($self) = @_;
    my @temp = split($sep, $ENV{$$self});
    my $result = pop @temp;
    $ENV{$$self} = join($sep, @temp);
    return $result;
}

sub UNSHIFT {
    my $self = shift;
    my @temp = split($sep, $ENV{$$self});
    my $result = unshift @temp, @_;
    $ENV{$$self} = join($sep, @temp);
    return $result;
}

sub SHIFT {
    my ($self) = @_;
    my @temp = split($sep, $ENV{$$self});
    my $result = shift @temp;
    $ENV{$$self} = join($sep, @temp);
    return $result;
}

sub SPLICE {
    my $self = shift;
    my $offset = shift;
    my $length = shift;
    my @temp = split($sep, $ENV{$$self});
    if (wantarray) {
	my @result = splice @temp, $offset, $length, @_;
	$ENV{$$self} = join($sep, @temp);
	return @result;
    } else {
	my $result = scalar splice @temp, $offset, $length, @_;
	$ENV{$$self} = join($sep, @temp);
	return $result;
    }
}

######################################################################

package Env::Array::VMS;
use Tie::Array;

@ISA = qw(Tie::Array);
 
sub TIEARRAY {
    bless \($_[1]);
}

sub FETCHSIZE {
    my ($self) = @_;
    my $i = 0;
    while ($i < 127 and defined $ENV{$$self . ';' . $i}) { $i++; };
    return $i;
}

sub FETCH {
    my ($self, $index) = @_;
    return $ENV{$$self . ';' . $index};
}

sub EXISTS {
    my ($self, $index) = @_;
    return $index < $self->FETCHSIZE;
}

sub DELETE { }