in module.install create default variable only when they do not exists

Hi,

I am building a community website programmatically, therefore most of the configuration is done through modules (setting variables, creating default content, etc.)

Would it be possible in pathauto.install, function pathauto_install() to setup the default variables (patterns, etc.) only if they do not exists yet. Currently pathauto simply dump its default value without caring for existing ones. It is not a big change, and it would certainly make life easier for a couple of people like me who are using drupal as a framework.

The simple way to achieve that is to replace instructions like this one:

  variable_set('pathauto_node_pattern', 'content/[node:title]');

by

  $v = variable_get('pathauto_node_pattern', 'content/[node:title]');
  variable_set('pathauto_node_pattern', $v);

I should be able tp provide a patch if required.

Cheers,

Sylvain