370 lines
8.6 KiB
Perl
370 lines
8.6 KiB
Perl
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#line 1
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package Module::Install;
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# For any maintainers:
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# The load order for Module::Install is a bit magic.
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# It goes something like this...
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#
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# IF ( host has Module::Install installed, creating author mode ) {
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# 1. Makefile.PL calls "use inc::Module::Install"
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# 2. $INC{inc/Module/Install.pm} set to installed version of inc::Module::Install
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# 3. The installed version of inc::Module::Install loads
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# 4. inc::Module::Install calls "require Module::Install"
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# 5. The ./inc/ version of Module::Install loads
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# } ELSE {
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# 1. Makefile.PL calls "use inc::Module::Install"
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# 2. $INC{inc/Module/Install.pm} set to ./inc/ version of Module::Install
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# 3. The ./inc/ version of Module::Install loads
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# }
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BEGIN {
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require 5.004;
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}
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use strict 'vars';
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use vars qw{$VERSION};
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BEGIN {
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# All Module::Install core packages now require synchronised versions.
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# This will be used to ensure we don't accidentally load old or
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# different versions of modules.
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# This is not enforced yet, but will be some time in the next few
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# releases once we can make sure it won't clash with custom
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# Module::Install extensions.
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$VERSION = '0.77';
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*inc::Module::Install::VERSION = *VERSION;
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@inc::Module::Install::ISA = __PACKAGE__;
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}
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# Whether or not inc::Module::Install is actually loaded, the
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# $INC{inc/Module/Install.pm} is what will still get set as long as
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# the caller loaded module this in the documented manner.
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# If not set, the caller may NOT have loaded the bundled version, and thus
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# they may not have a MI version that works with the Makefile.PL. This would
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# result in false errors or unexpected behaviour. And we don't want that.
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my $file = join( '/', 'inc', split /::/, __PACKAGE__ ) . '.pm';
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unless ( $INC{$file} ) { die <<"END_DIE" }
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Please invoke ${\__PACKAGE__} with:
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use inc::${\__PACKAGE__};
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not:
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use ${\__PACKAGE__};
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END_DIE
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# If the script that is loading Module::Install is from the future,
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# then make will detect this and cause it to re-run over and over
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# again. This is bad. Rather than taking action to touch it (which
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# is unreliable on some platforms and requires write permissions)
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# for now we should catch this and refuse to run.
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if ( -f $0 and (stat($0))[9] > time ) { die <<"END_DIE" }
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Your installer $0 has a modification time in the future.
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This is known to create infinite loops in make.
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Please correct this, then run $0 again.
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END_DIE
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# Build.PL was formerly supported, but no longer is due to excessive
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# difficulty in implementing every single feature twice.
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if ( $0 =~ /Build.PL$/i ) { die <<"END_DIE" }
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Module::Install no longer supports Build.PL.
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It was impossible to maintain duel backends, and has been deprecated.
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Please remove all Build.PL files and only use the Makefile.PL installer.
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END_DIE
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# To save some more typing in Module::Install installers, every...
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# use inc::Module::Install
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# ...also acts as an implicit use strict.
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$^H |= strict::bits(qw(refs subs vars));
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use Cwd ();
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use File::Find ();
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use File::Path ();
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use FindBin;
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sub autoload {
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my $self = shift;
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my $who = $self->_caller;
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my $cwd = Cwd::cwd();
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my $sym = "${who}::AUTOLOAD";
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$sym->{$cwd} = sub {
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my $pwd = Cwd::cwd();
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if ( my $code = $sym->{$pwd} ) {
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# delegate back to parent dirs
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goto &$code unless $cwd eq $pwd;
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}
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$$sym =~ /([^:]+)$/ or die "Cannot autoload $who - $sym";
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unless ( uc($1) eq $1 ) {
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unshift @_, ( $self, $1 );
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goto &{$self->can('call')};
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}
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};
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}
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sub import {
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my $class = shift;
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my $self = $class->new(@_);
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my $who = $self->_caller;
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unless ( -f $self->{file} ) {
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require "$self->{path}/$self->{dispatch}.pm";
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File::Path::mkpath("$self->{prefix}/$self->{author}");
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$self->{admin} = "$self->{name}::$self->{dispatch}"->new( _top => $self );
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$self->{admin}->init;
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@_ = ($class, _self => $self);
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goto &{"$self->{name}::import"};
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}
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*{"${who}::AUTOLOAD"} = $self->autoload;
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$self->preload;
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# Unregister loader and worker packages so subdirs can use them again
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delete $INC{"$self->{file}"};
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delete $INC{"$self->{path}.pm"};
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return 1;
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}
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sub preload {
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my $self = shift;
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unless ( $self->{extensions} ) {
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$self->load_extensions(
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"$self->{prefix}/$self->{path}", $self
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);
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}
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my @exts = @{$self->{extensions}};
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unless ( @exts ) {
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my $admin = $self->{admin};
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@exts = $admin->load_all_extensions;
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}
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my %seen;
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foreach my $obj ( @exts ) {
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while (my ($method, $glob) = each %{ref($obj) . '::'}) {
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next unless $obj->can($method);
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next if $method =~ /^_/;
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next if $method eq uc($method);
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$seen{$method}++;
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}
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}
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my $who = $self->_caller;
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foreach my $name ( sort keys %seen ) {
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*{"${who}::$name"} = sub {
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${"${who}::AUTOLOAD"} = "${who}::$name";
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goto &{"${who}::AUTOLOAD"};
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};
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}
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}
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sub new {
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my ($class, %args) = @_;
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# ignore the prefix on extension modules built from top level.
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my $base_path = Cwd::abs_path($FindBin::Bin);
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unless ( Cwd::abs_path(Cwd::cwd()) eq $base_path ) {
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delete $args{prefix};
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}
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return $args{_self} if $args{_self};
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$args{dispatch} ||= 'Admin';
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$args{prefix} ||= 'inc';
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$args{author} ||= ($^O eq 'VMS' ? '_author' : '.author');
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$args{bundle} ||= 'inc/BUNDLES';
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$args{base} ||= $base_path;
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$class =~ s/^\Q$args{prefix}\E:://;
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$args{name} ||= $class;
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$args{version} ||= $class->VERSION;
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unless ( $args{path} ) {
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$args{path} = $args{name};
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$args{path} =~ s!::!/!g;
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}
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$args{file} ||= "$args{base}/$args{prefix}/$args{path}.pm";
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$args{wrote} = 0;
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bless( \%args, $class );
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}
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sub call {
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my ($self, $method) = @_;
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my $obj = $self->load($method) or return;
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splice(@_, 0, 2, $obj);
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goto &{$obj->can($method)};
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}
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sub load {
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my ($self, $method) = @_;
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$self->load_extensions(
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"$self->{prefix}/$self->{path}", $self
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) unless $self->{extensions};
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foreach my $obj (@{$self->{extensions}}) {
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return $obj if $obj->can($method);
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}
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my $admin = $self->{admin} or die <<"END_DIE";
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The '$method' method does not exist in the '$self->{prefix}' path!
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Please remove the '$self->{prefix}' directory and run $0 again to load it.
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END_DIE
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my $obj = $admin->load($method, 1);
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push @{$self->{extensions}}, $obj;
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$obj;
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}
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sub load_extensions {
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my ($self, $path, $top) = @_;
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unless ( grep { lc $_ eq lc $self->{prefix} } @INC ) {
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unshift @INC, $self->{prefix};
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}
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foreach my $rv ( $self->find_extensions($path) ) {
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my ($file, $pkg) = @{$rv};
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next if $self->{pathnames}{$pkg};
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local $@;
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my $new = eval { require $file; $pkg->can('new') };
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unless ( $new ) {
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warn $@ if $@;
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next;
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}
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$self->{pathnames}{$pkg} = delete $INC{$file};
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push @{$self->{extensions}}, &{$new}($pkg, _top => $top );
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}
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$self->{extensions} ||= [];
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}
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sub find_extensions {
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my ($self, $path) = @_;
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my @found;
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File::Find::find( sub {
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my $file = $File::Find::name;
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return unless $file =~ m!^\Q$path\E/(.+)\.pm\Z!is;
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my $subpath = $1;
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return if lc($subpath) eq lc($self->{dispatch});
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$file = "$self->{path}/$subpath.pm";
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my $pkg = "$self->{name}::$subpath";
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$pkg =~ s!/!::!g;
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# If we have a mixed-case package name, assume case has been preserved
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# correctly. Otherwise, root through the file to locate the case-preserved
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# version of the package name.
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if ( $subpath eq lc($subpath) || $subpath eq uc($subpath) ) {
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my $content = Module::Install::_read($subpath . '.pm');
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my $in_pod = 0;
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foreach ( split //, $content ) {
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$in_pod = 1 if /^=\w/;
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$in_pod = 0 if /^=cut/;
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next if ($in_pod || /^=cut/); # skip pod text
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next if /^\s*#/; # and comments
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if ( m/^\s*package\s+($pkg)\s*;/i ) {
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$pkg = $1;
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last;
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}
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}
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}
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push @found, [ $file, $pkg ];
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}, $path ) if -d $path;
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@found;
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}
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#####################################################################
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# Utility Functions
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sub _caller {
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my $depth = 0;
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my $call = caller($depth);
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while ( $call eq __PACKAGE__ ) {
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$depth++;
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$call = caller($depth);
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}
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return $call;
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}
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sub _read {
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local *FH;
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open FH, "< $_[0]" or die "open($_[0]): $!";
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my $str = do { local $/; <FH> };
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close FH or die "close($_[0]): $!";
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return $str;
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}
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sub _write {
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local *FH;
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open FH, "> $_[0]" or die "open($_[0]): $!";
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foreach ( 1 .. $#_ ) { print FH $_[$_] or die "print($_[0]): $!" }
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close FH or die "close($_[0]): $!";
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}
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# _version is for processing module versions (eg, 1.03_05) not
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# Perl versions (eg, 5.8.1).
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sub _version ($) {
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my $s = shift || 0;
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$s =~ s/^(\d+)\.?//;
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my $l = $1 || 0;
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my @v = map { $_ . '0' x (3 - length $_) } $s =~ /(\d{1,3})\D?/g;
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$l = $l . '.' . join '', @v if @v;
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return $l + 0;
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}
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# Cloned from Params::Util::_CLASS
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sub _CLASS ($) {
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(
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defined $_[0]
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and
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! ref $_[0]
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and
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$_[0] =~ m/^[^\W\d]\w*(?:::\w+)*$/s
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) ? $_[0] : undef;
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}
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1;
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# Copyright 2008 Adam Kennedy.
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