search in a section a setting and execute a command

[puppetstan]

Hi,

Actually my configuation permit to search in a section a parameter and give it a value. this it's ok

ini_setting {'priority':
  ensure                => present,
  path                  => '/etc/file',
  section               => 'main',
  key_val_separator     => '=',
  setting               => 'priority',
  value                 => '5',
}


But now, i would like doing the same (search in a section a parameter) if he doesnt exist, not create it and give a value but execute a command...

can you have an idea?
regards