+
−/* -*- 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;;