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package ENVDumper;
use strict;
use warnings;
our @EXPORT_OK = qw(dumpenv undump);
my %trans = (
"\0" => "\\0",
"\r" => "\\r",
"\n" => "\\n",
"\t" => "\\t",
"\f" => "\\f",
"\b" => "\\b",
"\a" => "\\a",
"\e" => "\\e",
"\\" => "\\\\",
);
my %reverse = reverse %trans;
sub import {
my ($class, @args) = @_;
if (grep $_ eq '--dump', @args) {
print dumpenv();
exit 0;
}
elsif (@args) {
require Exporter;
goto &Exporter::import;
}
}
sub dumpenv {
my $out = '';
my ($match) = map qr/$_/, join ('|', map quotemeta, sort keys %trans);
for my $key (sort keys %ENV) {
my $value = $ENV{$key};
$value = '' unless defined $value;
s/($match)/$trans{$1}/g
for ($key, $value);
$out .= "$key\t$value\n";
}
$out;
}
sub undump {
my $in = shift || '';
my $out = {};
my ($match) = map qr/$_/, join ('|', map quotemeta, sort keys %reverse);
my @lines = split /\r\n?|\n/, $in;
for my $line (@lines) {
my ($key, $value) = split /\t/, $line, 2;
$_ && s/($match)/$reverse{$1}/g
for ($key, $value);
$out->{$key} = $value;
}
$out;
}
1;
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