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package deprecate; use strict; use warnings; our $VERSION = 0.04; # our %Config can ignore %Config::Config, e.g. for testing our %Config; unless (%Config) { require Config; *Config = \%Config::Config; } # Debian-specific change: recommend the separate Debian packages of # deprecated modules where available our %DEBIAN_PACKAGES = ( #'Foo:Bar' => 'libfoo-bar-perl', ); # This isn't a public API. It's internal to code maintained by the perl-porters # If you would like it to be a public API, please send a patch with # documentation and tests. Until then, it may change without warning. sub __loaded_from_core { my ($package, $file, $expect_leaf) = @_; foreach my $pair ([qw(sitearchexp archlibexp)], [qw(sitelibexp privlibexp)]) { my ($site, $priv) = @Config{@$pair}; if ($^O eq 'VMS') { for my $d ($site, $priv) { $d = VMS::Filespec::unixify($d) }; } # Just in case anyone managed to configure with trailing /s s!/*$!!g foreach $site, $priv; next if $site eq $priv; if (uc("$priv/$expect_leaf") eq uc($file)) { return 1; } } return 0; } sub import { my ($package, $file) = caller; my $expect_leaf = "$package.pm"; $expect_leaf =~ s!::!/!g; if (__loaded_from_core($package, $file, $expect_leaf)) { my $call_depth=1; my @caller; while (@caller = caller $call_depth++) { last if $caller[7] # use/require and $caller[6] eq $expect_leaf; # the package file } unless (@caller) { require Carp; Carp::cluck(<<"EOM"); Can't find use/require $expect_leaf in caller stack EOM return; } # This is fragile, because it # is directly poking in the internals of warnings.pm my ($call_file, $call_line, $callers_bitmask) = @caller[1,2,9]; if (defined $callers_bitmask && (vec($callers_bitmask, $warnings::Offsets{deprecated}, 1) || vec($callers_bitmask, $warnings::Offsets{all}, 1))) { if (my $deb = $DEBIAN_PACKAGES{$package}) { warn <<"EOM"; $package will be removed from the Perl core distribution in the next major release. Please install the separate $deb package. It is being used at $call_file, line $call_line. EOM } else { warn <<"EOM"; $package will be removed from the Perl core distribution in the next major release. Please install it from CPAN. It is being used at $call_file, line $call_line. EOM } } } } 1; __END__ =head1 NAME deprecate - Perl pragma for deprecating the inclusion of a module in core =head1 SYNOPSIS use deprecate; # warn about future absence if loaded from core =head1 DESCRIPTION This pragma simplifies the maintenance of dual-life modules that will no longer be included in the Perl core in a future Perl release, but are still included currently. The purpose of the pragma is to alert users to the status of such a module by issuing a warning that encourages them to install the module from CPAN, so that a future upgrade to a perl which omits the module will not break their code. This warning will only be issued if the module was loaded from a core library directory, which allows the C<use deprecate> line to be included in the CPAN version of the module. Because the pragma remains silent when the module is run from a non-core library directory, the pragma call does not need to be patched into or out of either the core or CPAN version of the module. The exact same code can be shipped for either purpose. =head2 Important Caveat Note that when a module installs from CPAN to a core library directory rather than the site library directories, the user gains no protection from having installed it. At the same time, this pragma cannot detect when such a module has installed from CPAN to the core library, and so it would endlessly and uselessly exhort the user to upgrade. Therefore modules that can install from CPAN to the core library must make sure not to call this pragma when they have done so. Generally this means that the exact logic from the installer must be mirrored inside the module. E.g.: # Makefile.PL WriteMakefile( # ... INSTALLDIRS => ( "$]" >= 5.011 ? 'site' : 'perl' ), ); # lib/Foo/Bar.pm use if "$]" >= 5.011, 'deprecate'; (The above example shows the most important case of this: when the target is a Perl older than 5.12 (where the core library directories take precedence over the site library directories) and the module being installed was included in core in that Perl version. Under those circumstances, an upgrade of the module from CPAN is only possible by installing to the core library.) =head1 EXPORT None by default. The only method is C<import>, called by C<use deprecate;>. =head1 SEE ALSO First example to C<use deprecate;> was L<Switch>. =head1 AUTHOR Original version by Nicholas Clark =head1 COPYRIGHT AND LICENSE Copyright (C) 2009, 2011 This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.0 or, at your option, any later version of Perl 5 you may have available. =cut