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define_tag(
'once',
-namespace='include_',
-priority='replace',
-description='Includes the specified file only if it has not already been included.'
);
fail_if(
!params->size || !params->first->isa('string'),
-1,
'[include_once] requires a file path as a parameter.'
);
local('path') = file_pathfromroot(params->first);
!var_defined('included_files') ? var('included_files' = set);
if($included_files !>> #path);
$included_files->insert(#path);
return(include(#path));
/if;
/define_tag;
