/* -*- sql -*-

   postgres specific registered procedures,

   require the plpgsql language installed

*/

DROP FUNCTION IF EXISTS comma_join (anyarray) CASCADE;

CREATE FUNCTION comma_join (anyarray) RETURNS text AS $$

    SELECT array_to_string($1, ', ')

$$ LANGUAGE SQL;;

DROP FUNCTION IF EXISTS cw_array_append_unique (anyarray, anyelement) CASCADE;

CREATE FUNCTION cw_array_append_unique (anyarray, anyelement) RETURNS anyarray AS $$

    SELECT array_append($1, (SELECT $2 WHERE $2 <> ALL($1)))

$$ LANGUAGE SQL;;

DROP AGGREGATE IF EXISTS group_concat (anyelement) CASCADE;

CREATE AGGREGATE group_concat (

  basetype = anyelement,

  sfunc = cw_array_append_unique,

  stype = anyarray,

  finalfunc = comma_join,

  initcond = '{}'

);;

DROP FUNCTION IF EXISTS limit_size (fulltext text, format text, maxsize integer);

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, '<[a-zA-Z/][^>]*>', '', '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;;

DROP FUNCTION IF EXISTS text_limit_size (fulltext text, maxsize integer);

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

BEGIN

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

END

$$ LANGUAGE plpgsql;;