Adding roles to a CPAN module

[Jan Henning Thorsen]

I suggest using Module::Find:

{
  use Module::Find 'usesub';
  with usesub "Whatever::Plugins";
}

That way you can see if the roles has conflicts. Adding one-and-one will
not detect conflicts in the same way.

2011/12/13 Tony Edwardson <Tony.Edwardson at lchclearnet.com>

>  I am writing a new CPAN module which uses Moose and I want it to
> comprise of a base module and a set of optional add-on sub modules which
> simply add new functionality via Roles.****
>
> I want these optional roles made available to the base module if they are
> installed.****
>
> Anyone got any idea how I can get my base module to include these optional
> roles once they are installed ?****
>
> ** **
>
> I have toyed with the following ideas but they all have issues :-****
>
> **1)      **package ‘Whatever’;
> use Try::Tiny;
> use Moose;
> my @optional_roles = qw/ Blah Blah2 /;
> foreach my $optional_role ( @optional_roles ) {
> try {
>     with “Whatever::$optional_role”;****
>
> }; # Ignore errors if with fails****
>
> **2)      **package ‘Whatever’;
> use ExtUtils::Installed;
> use Carp;
> my $inst = ExtUtils::Installed->new();
> my @optional_roles = grep { /Whatever::/ } @{ $inst->modules() };
> foreach my $optional_role ( @optional_roles ) {
> try {
>     with “Whatever::$optional_role”;
> } catch {
>    croak “Failed to add role $optional_role: $_”;
> };****
>
> **3)      **Get the installer for my optional roles to maintain a file
> containing the roles installed and refer to that in my base module****
>
> ** **
>
> Is there a better way to handle this ?****
>
> ** **
>
> ** **
>
> *Tony Edwardson*
>
> ForexClear Application Support****
>
> Tel.      +44 (0) 20 7426 7569****
>
> Mob.    +44 (0) 7712 100283****
>
> Email. Tony.Edwardson at lchclearnet.com****
>
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