use warnings;
use strict;
-use Carp ();
+use Carp;
# NO EXTERNAL NON-5.8.1 CORE DEPENDENCIES EVER (e.g. C::A::G)
# This module is to be loaded by Makefile.PM on a pristine system
};
-our %req_availability_cache;
+
+### Public API
+
+# OO for (mistakenly considered) ease of extensibility, not due to any need to
+# carry state of any sort. This API is currently used outside, so leave as-is.
+# FIXME - make sure to not propagate this further if module is extracted as a
+# standalone library - keep the stupidity to a DBIC-secific shim!
+#
sub req_list_for {
my ($class, $group) = @_;
- Carp::croak "req_list_for() expects a requirement group name"
+ croak "req_list_for() expects a requirement group name"
unless $group;
my $deps = $reqs->{$group}{req}
- or Carp::croak "Requirement group '$group' does not exist";
+ or croak "Requirement group '$group' does not exist";
return { %$deps };
}
+sub req_group_list {
+ return { map { $_ => { %{ $reqs->{$_}{req} || {} } } } (keys %$reqs) };
+}
-sub die_unless_req_ok_for {
+sub req_errorlist_for {
my ($class, $group) = @_;
- Carp::croak "die_unless_req_ok_for() expects a requirement group name"
+ croak "req_errorlist_for() expects a requirement group name"
unless $group;
- $class->_check_deps($group)->{status}
- or die sprintf( "Required modules missing, unable to continue: %s\n", $class->_check_deps($group)->{missing} );
+ return $class->_check_deps($group)->{errorlist};
}
sub req_ok_for {
my ($class, $group) = @_;
- Carp::croak "req_ok_for() expects a requirement group name"
+ croak "req_ok_for() expects a requirement group name"
unless $group;
return $class->_check_deps($group)->{status};
sub req_missing_for {
my ($class, $group) = @_;
- Carp::croak "req_missing_for() expects a requirement group name"
+ croak "req_missing_for() expects a requirement group name"
unless $group;
return $class->_check_deps($group)->{missing};
}
-sub req_errorlist_for {
+sub die_unless_req_ok_for {
my ($class, $group) = @_;
- Carp::croak "req_errorlist_for() expects a requirement group name"
+ croak "die_unless_req_ok_for() expects a requirement group name"
unless $group;
- return $class->_check_deps($group)->{errorlist};
+ $class->_check_deps($group)->{status}
+ or die sprintf( "Required modules missing, unable to continue: %s\n", $class->_check_deps($group)->{missing} );
}
+
+
+### Private OO API
+
+our %req_availability_cache;
sub _check_deps {
my ($class, $group) = @_;
my $res;
if (keys %errors) {
- my $missing = join (', ', map { $deps->{$_} ? "$_ >= $deps->{$_}" : $_ } (sort keys %errors) );
- $missing .= " (see $class for details)" if $reqs->{$group}{pod};
+ my $missing = join (', ', map { $deps->{$_} ? qq("${_}~>=$deps->{$_}") : $_ } (sort keys %errors) );
+ $missing .= " (see $class documentation for details)" if $reqs->{$group}{pod};
$res = {
status => 0,
errorlist => \%errors,
};
}
-sub req_group_list {
- return { map { $_ => { %{ $reqs->{$_}{req} || {} } } } (keys %$reqs) };
-}
-
# This is to be called by the author only (automatically in Makefile.PL)
sub _gen_pod {
my ($class, $distver, $pod_dir) = @_;
my $sqltver = $class->req_list_for ('deploy')->{'SQL::Translator'}
or die "Hrmm? No sqlt dep?";
- my @chunks = (
- <<"EOC",
+
+ my @chunks;
+
+#@@
+#@@ HEADER
+#@@
+ push @chunks, <<"EOC";
#########################################################################
##################### A U T O G E N E R A T E D ########################
#########################################################################
# will be lost. If you need to change the generated text edit _gen_pod()
# at the end of $modfn
#
+
+=head1 NAME
+
+$class - Optional module dependency specifications (for module authors)
EOC
- '=head1 NAME',
- "$class - Optional module dependency specifications (for module authors)",
- '=head1 SYNOPSIS',
- <<"EOS",
-Somewhere in your build-file (e.g. L<Module::Install>'s Makefile.PL):
+
+
+#@@
+#@@ SYNOPSIS HEADING
+#@@
+ push @chunks, <<"EOC";
+=head1 SYNOPSIS
+
+Somewhere in your build-file (e.g. L<ExtUtils::MakeMaker>'s F<Makefile.PL>):
...
- configure_requires 'DBIx::Class' => '$distver';
+ \$EUMM_ARGS{CONFIGURE_REQUIRES} = {
+ \%{ \$EUMM_ARGS{CONFIGURE_REQUIRES} || {} },
+ 'DBIx::Class' => '$distver',
+ };
- require $class;
+ ...
- my \$deploy_deps = $class->req_list_for('deploy');
+ my %DBIC_DEPLOY_DEPS = %{ eval {
+ require $class;
+ $class->req_list_for('deploy');
+ } || {} };
- for (keys %\$deploy_deps) {
- requires \$_ => \$deploy_deps->{\$_};
- }
+ \$EUMM_ARGS{PREREQ_PM} = {
+ \%DBIC_DEPLOY_DEPS,
+ \%{ \$EUMM_ARGS{PREREQ_PM} || {} },
+ };
...
-Note that there are some caveats regarding C<configure_requires()>, more info
-can be found at L<Module::Install/configure_requires>
-EOS
- '=head1 DESCRIPTION',
- <<'EOD',
+ ExtUtils::MakeMaker::WriteMakefile(\%EUMM_ARGS);
+
+B<Note>: The C<eval> protection within the example is due to support for
+requirements during L<the C<configure> build phase|CPAN::Meta::Spec/Phases>
+not being available on a sufficient portion of production installations of
+Perl. Robust support for such dependency requirements is available in the
+L<CPAN> installer only since version C<1.94_56> first made available for
+production with perl version C<5.12>. It is the belief of the current
+maintainer that support for requirements during the C<configure> build phase
+will not be sufficiently ubiquitous until the B<year 2020> at the earliest,
+hence the extra care demonstrated above. It should also be noted that some
+3rd party installers (e.g. L<cpanminus|App::cpanminus>) do the right thing
+with configure requirements independent from the versions of perl and CPAN
+available.
+EOC
+
+
+#@@
+#@@ DESCRIPTION HEADING
+#@@
+ push @chunks, <<'EOC';
+=head1 DESCRIPTION
+
Some of the less-frequently used features of L<DBIx::Class> have external
module dependencies on their own. In order not to burden the average user
-with modules he will never use, these optional dependencies are not included
+with modules they will never use, these optional dependencies are not included
in the base Makefile.PL. Instead an exception with a descriptive message is
-thrown when a specific feature is missing one or several modules required for
-its operation. This module is the central holding place for the current list
+thrown when a specific feature can't find one or several modules required for
+its operation. This module is the central holding place for the current list
of such dependencies, for DBIx::Class core authors, and DBIx::Class extension
authors alike.
-EOD
- '=head1 CURRENT REQUIREMENT GROUPS',
- <<'EOD',
-Dependencies are organized in C<groups> and each group can list one or more
-required modules, with an optional minimum version (or 0 for any version).
-The group name can be used in the
-EOD
- );
+
+Dependencies are organized in L<groups|/CURRENT REQUIREMENT GROUPS> where each
+group can list one or more required modules, with an optional minimum version
+(or 0 for any version). The group name can be used in the
+L<public methods|/METHODS> as described below.
+EOC
+
+
+#@@
+#@@ REQUIREMENT GROUPLIST HEADING
+#@@
+ push @chunks, '=head1 CURRENT REQUIREMENT GROUPS';
for my $group (sort keys %$reqs) {
my $p = $reqs->{$group}{pod}
);
}
- push @chunks, (
- '=head1 METHODS',
- '=head2 req_group_list',
- '=over',
- '=item Arguments: none',
- '=item Return Value: \%list_of_requirement_groups',
- '=back',
- <<'EOD',
+
+#@@
+#@@ API DOCUMENTATION HEADING
+#@@
+ push @chunks, <<'EOC';
+
+=head1 METHODS
+
+=head2 req_group_list
+
+=over
+
+=item Arguments: none
+
+=item Return Value: \%list_of_requirement_groups
+
+=back
+
This method should be used by DBIx::Class packagers, to get a hashref of all
dependencies keyed by dependency group. Each key (group name) can be supplied
to one of the group-specific methods below.
-EOD
-
- '=head2 req_list_for',
- '=over',
- '=item Arguments: $group_name',
- '=item Return Value: \%list_of_module_version_pairs',
- '=back',
- <<'EOD',
+The B<values> of the returned hash are currently a set of options B<without a
+well defined structure>. If you have use for any of the contents - contact the
+maintainers, instead of treating this as public (left alone stable) API.
+
+=head2 req_list_for
+
+=over
+
+=item Arguments: $group_name
+
+=item Return Value: \%list_of_module_version_pairs
+
+=back
+
This method should be used by DBIx::Class extension authors, to determine the
version of modules a specific feature requires in the B<current> version of
-DBIx::Class. See the L</SYNOPSIS> for a real-world
-example.
-EOD
-
- '=head2 req_ok_for',
- '=over',
- '=item Arguments: $group_name',
- '=item Return Value: 1|0',
- '=back',
- <<'EOD',
+DBIx::Class. See the L</SYNOPSIS> for a real-world example.
+
+=head2 req_ok_for
+
+=over
+
+=item Arguments: $group_name
+
+=item Return Value: 1|0
+
+=back
+
Returns true or false depending on whether all modules required by
C<$group_name> are present on the system and loadable.
-EOD
-
- '=head2 req_missing_for',
- '=over',
- '=item Arguments: $group_name',
- '=item Return Value: $error_message_string',
- '=back',
- <<"EOD",
-Returns a single line string suitable for inclusion in larger error messages.
-This method would normally be used by DBIx::Class core-module author, to
-indicate to the user that he needs to install specific modules before he will
-be able to use a specific feature.
+
+=head2 req_missing_for
+
+=over
+
+=item Arguments: $group_name
+
+=item Return Value: $error_message_string
+
+=back
+
+This method would normally be used by DBIx::Class core-modules, to indicate to
+the user that they need to install specific modules before being able to use a
+specific feature set.
For example if some of the requirements for C<deploy> are not available,
the returned string could look like:
+EOC
- SQL::Translator >= $sqltver (see $class for details)
+ push @chunks, qq{ "SQL::Translator~>=$sqltver" (see $class documentation for details)};
+ push @chunks, <<'EOC';
The author is expected to prepend the necessary text to this message before
returning the actual error seen by the user.
-EOD
- '=head2 die_unless_req_ok_for',
- '=over',
- '=item Arguments: $group_name',
- '=back',
- <<'EOD',
+=head2 die_unless_req_ok_for
+
+=over
+
+=item Arguments: $group_name
+
+=back
+
Checks if L</req_ok_for> passes for the supplied C<$group_name>, and
in case of failure throws an exception including the information
from L</req_missing_for>.
-EOD
-
- '=head2 req_errorlist_for',
- '=over',
- '=item Arguments: $group_name',
- '=item Return Value: \%list_of_loaderrors_per_module',
- '=back',
- <<'EOD',
+
+=head2 req_errorlist_for
+
+=over
+
+=item Arguments: $group_name
+
+=item Return Value: \%list_of_loaderrors_per_module
+
+=back
+
Returns a hashref containing the actual errors that occurred while attempting
to load each module in the requirement group.
-EOD
- '=head1 FURTHER QUESTIONS?',
- 'Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.',
- '=head1 COPYRIGHT AND LICENSE',
- <<'EOL',
+EOC
+
+#@@
+#@@ FOOTER
+#@@
+ push @chunks, <<'EOC';
+=head1 FURTHER QUESTIONS?
+
+Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
+
+=head1 COPYRIGHT AND LICENSE
+
This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
redistribute it and/or modify it under the same terms as the
L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.
-EOL
-
- );
+EOC
- open (my $fh, '>', $podfn) or Carp::croak "Unable to write to $podfn: $!";
- print $fh join ("\n\n", @chunks);
- print $fh "\n";
- close ($fh);
+ eval {
+ open (my $fh, '>', $podfn) or die;
+ print $fh join ("\n\n", @chunks) or die;
+ print $fh "\n" or die;
+ close ($fh) or die;
+ } or croak( "Unable to write $podfn: " . ( $! || $@ || 'unknown error') );
}
1;
projects / dbsrgits/DBIx-Class.git / blobdiff