def workspaces_provider(context):
    """
    create a vocab of all workspaces in this site
    """
    catalog = api.portal.get_tool(name="portal_catalog")
    workspaces = catalog(portal_type="ploneintranet.workspace.workspacefolder")
    current = api.content.get_uuid(context)

    terms = []
    for ws in workspaces:
        if current != ws["UID"]:
            terms.append(SimpleVocabulary.createTerm(
                ws["UID"], ws["UID"], ws["Title"]))

    return SimpleVocabulary(terms)
create a vocab of all workspaces in this site