SYNOPSIS

In your base class:

package MyApp;
use MooseX::App qw(MutexGroup);
option 'UseAmmonia' => (
is => 'ro',
isa => 'Bool',
mutexgroup => 'NonMixableCleaningChemicals',
);
option 'UseChlorine' => (
is => 'ro',
isa => 'Bool',
mutexgroup => 'NonMixableCleaningChemicals'
);

In your script:

 #!/usr/bin/env perl 
  
 use strict; 
 use warnings; 
 
 use MyApp; 
 MyApp->new_with_options( UseAmmonia => 1, UseChlorine => 1 );
 # generates Error 
 # More than one attribute from mutexgroup NonMixableCleaningChemicals('UseAmmonia','UseChlorine') *cannot* be specified
 MyApp->new_with_options();
 # generates Error 
 # One attribute from mutexgroup NonMixableCleaningChemicals('UseAmmonia','UseChlorine') *must* be specified
 MyApp->new_with_options( UseAmmonia => 1 );
 # generates no errors
 MyApp->new_with_options( UseChlorine => 1 );
 # generates no errors

DESCRIPTION

This plugin adds mutually exclusive options to your application. In the current implementation, all defined MutexGroups *must* have exactly one initialized option. This means that there is an implicit requiredness of one option from each MutexGroup.