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adding inc::Module::Install

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1 parent 9367ccf commit 5f4007d5d01ab8b342171d2e8ba2ec6a2f8260ff @tla tla committed Aug 8, 2007
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@@ -0,0 +1,265 @@
+#line 1
+package Module::Install;
+
+# For any maintainers:
+# The load order for Module::Install is a bit magic.
+# It goes something like this...
+#
+# IF ( host has Module::Install installed, creating author mode ) {
+# 1. Makefile.PL calls "use inc::Module::Install"
+# 2. $INC{inc/Module/Install.pm} set to installed version of inc::Module::Install
+# 3. The installed version of inc::Module::Install loads
+# 4. inc::Module::Install calls "require Module::Install"
+# 5. The ./inc/ version of Module::Install loads
+# } ELSE {
+# 1. Makefile.PL calls "use inc::Module::Install"
+# 2. $INC{inc/Module/Install.pm} set to ./inc/ version of Module::Install
+# 3. The ./inc/ version of Module::Install loads
+# }
+
+use 5.004;
+use strict 'vars';
+
+use vars qw{$VERSION};
+BEGIN {
+ # All Module::Install core packages now require synchronised versions.
+ # This will be used to ensure we don't accidentally load old or
+ # different versions of modules.
+ # This is not enforced yet, but will be some time in the next few
+ # releases once we can make sure it won't clash with custom
+ # Module::Install extensions.
+ $VERSION = '0.62';
+}
+
+# Whether or not inc::Module::Install is actually loaded, the
+# $INC{inc/Module/Install.pm} is what will still get set as long as
+# the caller loaded module this in the documented manner.
+# If not set, the caller may NOT have loaded the bundled version, and thus
+# they may not have a MI version that works with the Makefile.PL. This would
+# result in false errors or unexpected behaviour. And we don't want that.
+my $file = join( '/', 'inc', split /::/, __PACKAGE__ ) . '.pm';
+unless ( $INC{$file} ) {
+ die <<"END_DIE";
+Please invoke ${\__PACKAGE__} with:
+
+ use inc::${\__PACKAGE__};
+
+not:
+
+ use ${\__PACKAGE__};
+
+END_DIE
+}
+
+use Cwd ();
+use File::Find ();
+use File::Path ();
+use FindBin;
+
+*inc::Module::Install::VERSION = *VERSION;
+@inc::Module::Install::ISA = __PACKAGE__;
+
+sub autoload {
+ my $self = shift;
+ my $who = $self->_caller;
+ my $cwd = Cwd::cwd();
+ my $sym = "${who}::AUTOLOAD";
+ $sym->{$cwd} = sub {
+ my $pwd = Cwd::cwd();
+ if ( my $code = $sym->{$pwd} ) {
+ # delegate back to parent dirs
+ goto &$code unless $cwd eq $pwd;
+ }
+ $$sym =~ /([^:]+)$/ or die "Cannot autoload $who - $sym";
+ unshift @_, ($self, $1);
+ goto &{$self->can('call')} unless uc($1) eq $1;
+ };
+}
+
+sub import {
+ my $class = shift;
+ my $self = $class->new(@_);
+ my $who = $self->_caller;
+
+ unless ( -f $self->{file} ) {
+ require "$self->{path}/$self->{dispatch}.pm";
+ File::Path::mkpath("$self->{prefix}/$self->{author}");
+ $self->{admin} = "$self->{name}::$self->{dispatch}"->new( _top => $self );
+ $self->{admin}->init;
+ @_ = ($class, _self => $self);
+ goto &{"$self->{name}::import"};
+ }
+
+ *{"${who}::AUTOLOAD"} = $self->autoload;
+ $self->preload;
+
+ # Unregister loader and worker packages so subdirs can use them again
+ delete $INC{"$self->{file}"};
+ delete $INC{"$self->{path}.pm"};
+}
+
+sub preload {
+ my ($self) = @_;
+
+ unless ( $self->{extensions} ) {
+ $self->load_extensions(
+ "$self->{prefix}/$self->{path}", $self
+ );
+ }
+
+ my @exts = @{$self->{extensions}};
+ unless ( @exts ) {
+ my $admin = $self->{admin};
+ @exts = $admin->load_all_extensions;
+ }
+
+ my %seen;
+ foreach my $obj ( @exts ) {
+ while (my ($method, $glob) = each %{ref($obj) . '::'}) {
+ next unless $obj->can($method);
+ next if $method =~ /^_/;
+ next if $method eq uc($method);
+ $seen{$method}++;
+ }
+ }
+
+ my $who = $self->_caller;
+ foreach my $name ( sort keys %seen ) {
+ *{"${who}::$name"} = sub {
+ ${"${who}::AUTOLOAD"} = "${who}::$name";
+ goto &{"${who}::AUTOLOAD"};
+ };
+ }
+}
+
+sub new {
+ my ($class, %args) = @_;
+
+ # ignore the prefix on extension modules built from top level.
+ my $base_path = Cwd::abs_path($FindBin::Bin);
+ unless ( Cwd::abs_path(Cwd::cwd()) eq $base_path ) {
+ delete $args{prefix};
+ }
+
+ return $args{_self} if $args{_self};
+
+ $args{dispatch} ||= 'Admin';
+ $args{prefix} ||= 'inc';
+ $args{author} ||= ($^O eq 'VMS' ? '_author' : '.author');
+ $args{bundle} ||= 'inc/BUNDLES';
+ $args{base} ||= $base_path;
+ $class =~ s/^\Q$args{prefix}\E:://;
+ $args{name} ||= $class;
+ $args{version} ||= $class->VERSION;
+ unless ( $args{path} ) {
+ $args{path} = $args{name};
+ $args{path} =~ s!::!/!g;
+ }
+ $args{file} ||= "$args{base}/$args{prefix}/$args{path}.pm";
+
+ bless( \%args, $class );
+}
+
+sub call {
+ my ($self, $method) = @_;
+ my $obj = $self->load($method) or return;
+ splice(@_, 0, 2, $obj);
+ goto &{$obj->can($method)};
+}
+
+sub load {
+ my ($self, $method) = @_;
+
+ $self->load_extensions(
+ "$self->{prefix}/$self->{path}", $self
+ ) unless $self->{extensions};
+
+ foreach my $obj (@{$self->{extensions}}) {
+ return $obj if $obj->can($method);
+ }
+
+ my $admin = $self->{admin} or die <<"END_DIE";
+The '$method' method does not exist in the '$self->{prefix}' path!
+Please remove the '$self->{prefix}' directory and run $0 again to load it.
+END_DIE
+
+ my $obj = $admin->load($method, 1);
+ push @{$self->{extensions}}, $obj;
+
+ $obj;
+}
+
+sub load_extensions {
+ my ($self, $path, $top) = @_;
+
+ unless ( grep { lc $_ eq lc $self->{prefix} } @INC ) {
+ unshift @INC, $self->{prefix};
+ }
+
+ foreach my $rv ( $self->find_extensions($path) ) {
+ my ($file, $pkg) = @{$rv};
+ next if $self->{pathnames}{$pkg};
+
+ local $@;
+ my $new = eval { require $file; $pkg->can('new') };
+ unless ( $new ) {
+ warn $@ if $@;
+ next;
+ }
+ $self->{pathnames}{$pkg} = delete $INC{$file};
+ push @{$self->{extensions}}, &{$new}($pkg, _top => $top );
+ }
+
+ $self->{extensions} ||= [];
+}
+
+sub find_extensions {
+ my ($self, $path) = @_;
+
+ my @found;
+ File::Find::find( sub {
+ my $file = $File::Find::name;
+ return unless $file =~ m!^\Q$path\E/(.+)\.pm\Z!is;
+ my $subpath = $1;
+ return if lc($subpath) eq lc($self->{dispatch});
+
+ $file = "$self->{path}/$subpath.pm";
+ my $pkg = "$self->{name}::$subpath";
+ $pkg =~ s!/!::!g;
+
+ # If we have a mixed-case package name, assume case has been preserved
+ # correctly. Otherwise, root through the file to locate the case-preserved
+ # version of the package name.
+ if ( $subpath eq lc($subpath) || $subpath eq uc($subpath) ) {
+ open PKGFILE, "<$subpath.pm" or die "find_extensions: Can't open $subpath.pm: $!";
+ my $in_pod = 0;
+ while ( <PKGFILE> ) {
+ $in_pod = 1 if /^=\w/;
+ $in_pod = 0 if /^=cut/;
+ next if ($in_pod || /^=cut/); # skip pod text
+ next if /^\s*#/; # and comments
+ if ( m/^\s*package\s+($pkg)\s*;/i ) {
+ $pkg = $1;
+ last;
+ }
+ }
+ close PKGFILE;
+ }
+
+ push @found, [ $file, $pkg ];
+ }, $path ) if -d $path;
+
+ @found;
+}
+
+sub _caller {
+ my $depth = 0;
+ my $call = caller($depth);
+ while ( $call eq __PACKAGE__ ) {
+ $depth++;
+ $call = caller($depth);
+ }
+ return $call;
+}
+
+1;
@@ -0,0 +1,70 @@
+#line 1
+package Module::Install::Base;
+
+$VERSION = '0.62';
+
+# Suspend handler for "redefined" warnings
+BEGIN {
+ my $w = $SIG{__WARN__};
+ $SIG{__WARN__} = sub { $w };
+}
+
+### This is the ONLY module that shouldn't have strict on
+# use strict;
+
+#line 41
+
+sub new {
+ my ($class, %args) = @_;
+
+ foreach my $method ( qw(call load) ) {
+ *{"$class\::$method"} = sub {
+ shift()->_top->$method(@_);
+ } unless defined &{"$class\::$method"};
+ }
+
+ bless( \%args, $class );
+}
+
+#line 61
+
+sub AUTOLOAD {
+ my $self = shift;
+ local $@;
+ my $autoload = eval { $self->_top->autoload } or return;
+ goto &$autoload;
+}
+
+#line 76
+
+sub _top { $_[0]->{_top} }
+
+#line 89
+
+sub admin {
+ $_[0]->_top->{admin} or Module::Install::Base::FakeAdmin->new;
+}
+
+sub is_admin {
+ $_[0]->admin->VERSION;
+}
+
+sub DESTROY {}
+
+package Module::Install::Base::FakeAdmin;
+
+my $Fake;
+sub new { $Fake ||= bless(\@_, $_[0]) }
+
+sub AUTOLOAD {}
+
+sub DESTROY {}
+
+# Restore warning handler
+BEGIN {
+ $SIG{__WARN__} = $SIG{__WARN__}->();
+}
+
+1;
+
+#line 138
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