SELECT pg_namespace.nspname AS routine_schema,  pg_proc.proname AS routine_name,    
pg_get_function_identity_arguments(pg_proc.oid) AS parameters,
CASE WHEN pg_proc.prokind='f' THEN 'FUNCTION'
  WHEN pg_proc.prokind='p' THEN 'PROCEDURE'
  WHEN pg_proc.prokind='a' THEN 'AGGREGATE FUNCTION'
  WHEN pg_proc.prokind='w' THEN 'WINDOW FUNCTION' END AS routine_type, 
regexp_replace(pg_proc.prosrc,'[\r\n]','<br>','g')  AS routine_src
FROM pg_catalog.pg_proc, pg_catalog.pg_namespace
WHERE pg_proc.pronamespace = pg_namespace.oid AND
pg_proc.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 
pg_namespace.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 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=pg_proc.oid) 
AND pg_proc.prosrc=Upper(pg_proc.prosrc) 
AND pg_proc.prosrc~'(INSERT|UPDATE|DELETE|FROM|WHERE|HAVING|GROUP[[:space:]]+BY|ORDER[[:space:]]+BY)'
ORDER BY routine_schema, routine_name, parameters;