/* -*- sql -*- 

   postgres specific registered procedures, 

   require the plpgsql language installed 

*/

CREATE FUNCTION comma_join (anyarray) RETURNS text AS $$

    SELECT array_to_string($1, ', ')

$$ LANGUAGE SQL;;

CREATE AGGREGATE group_concat (

  basetype = anyelement,

  sfunc = array_append,

  stype = anyarray,

  finalfunc = comma_join,

  initcond = '{}'

);;

CREATE FUNCTION limit_size (fulltext text, format text, maxsize integer) RETURNS text AS $$

DECLARE

    plaintext text;

BEGIN

    IF char_length(fulltext) < maxsize THEN

       RETURN fulltext;

    END IF;

    IF format = 'text/html' OR format = 'text/xhtml' OR format = 'text/xml' THEN

       plaintext := regexp_replace(fulltext, '<[\\w/][^>]+>', '', 'g');

    ELSE

       plaintext := fulltext;

    END IF;

    IF char_length(plaintext) < maxsize THEN

       RETURN plaintext;

    ELSE

       RETURN substring(plaintext from 1 for maxsize) || '...';

    END IF;

END

$$ LANGUAGE plpgsql;;

CREATE FUNCTION text_limit_size (fulltext text, maxsize integer) RETURNS text AS $$

BEGIN

    RETURN limit_size(fulltext, 'text/plain', maxsize);

END

$$ LANGUAGE plpgsql;;