NAME

       Catmandu::Cmd - A base class for extending the Catmandu command line

SYNOPSIS

         # to create a command:
         $ catmandu hello_world

         # you need a package:
         package Catmandu::Cmd::hello_world;
         use parent 'Catmandu::Cmd';

         sub command_opt_spec {
            (
                [ "greeting|g=s", "provide a greeting text" ],
            );
         }

         sub description {
            <<EOS;
         examples:

         catmandu hello_world --greeting "Hoi"

         options:
         EOS
         }

         sub command {
            my ($self, $opts, $args) = @_;
            my $greeting = $opts->greeting // 'Hello';
            print "$greeting, World!\n"
         }

         =head1 NAME

         Catmandu::Cmd::hello_world - prints a funny line

         =cut

DESCRIPTION

       Catmandu:Cmd is a base class to extend the commands that can be provided for the
       'catmandu' command line tools.  New catmandu commands should be defined in the
       Catmandu::Cmd namespace and extend Catmandu::Cmd.

       Every command needs to implement 4 things:

         * command_opt_spec - which should return an array of command options with documentation
         * description - a long description of the command
         * command - the body which is executed
         * head1 NAME - a short description of the command

METHODS

   command_opt_spec()
       This method should be overridden to provide option specifications. (This is list of
       arguments passed to describe_options from Getopt::Long::Descriptive, after the first.)

       If not overridden, it returns an empty list.

   descripton()
       This method should return a string containing the long documentation of the command

   command()
       This method does whatever it is the command should do! It is passed a hash reference of
       the parsed command-line options and an array reference of left over arguments.

DOCUMENTATION

       At least provide for every command a NAME documentation

SEE ALSO

       Catmandu::Cmd::config , Catmandu::Cmd::convert , Catmandu::Cmd::count ,
       Catmandu::Cmd::data , Catmandu::Cmd::delete , Catmandu::Cmd::export, Catmandu::Cmd::import
       , Catmandu::Cmd::move , Catmandu::Cmd::run