Comments of routines

SELECT 
  n.nspname AS routine_schema, 
  p.proname AS routine_name,
 pg_get_function_identity_arguments(p.oid) AS parameters,
CASE WHEN p.prokind='f' THEN 'FUNCTION'
  WHEN p.prokind='p' THEN 'PROCEDURE'
  WHEN p.prokind='a' THEN 'AGGREGATE FUNCTION'
  WHEN p.prokind='w' THEN 'WINDOW FUNCTION' END AS routine_type,
  d.description AS comment
FROM 
  (pg_catalog.pg_proc p JOIN pg_catalog.pg_namespace n ON p.pronamespace = n.oid) JOIN pg_catalog.pg_language l ON p.prolang=l.oid
  LEFT JOIN pg_catalog.pg_description d ON p.oid=d.objoid
WHERE 
   n.nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL) AND l.lanname IN ('sql','plpgsql') AND
p.proname NOT IN ('f_assume_you_must_use_files', 'f_check_format_comma_separated_list', 'f_check_password', 'f_default_value_with_no_match') AND NOT EXISTS (SELECT 1
FROM pg_catalog.pg_depend d 
WHERE EXISTS (SELECT 1 FROM pg_catalog.pg_extension e WHERE d.refobjid=e.oid) AND
d.objid=p.oid)
ORDER BY n.nspname, p.proname, parameters, d.description NULLS LAST;