~~~
:HOME here #4096 + ;

'%s/.config/retroforth/library/%s.retro 'library:.CONFIG s:const
'./library/%s.retro 'library:CWD s:const

:library:cwd library:CWD s:format ;

:library:.config
  'HOME HOME unix:getenv
  HOME library:.CONFIG s:format ;

:library:filename (s-s)
  dup library:cwd
  dup file:exists? [ nip ] if; drop
  library:.config dup file:exists? [ ] if; drop s:empty ;

:library:contains? (s-f)
  &library:cwd &library:.config bi &file:exists? bi@ or ;

:library:load
  dup library:contains? [ library:filename include ]
  [ 'ERROR:_Library_`%s`_was_not_found s:format s:put nl ] choose ;

'interface/library.retro s:dedup
dup 'library:load d:set-source
dup 'library:contains? d:set-source
dup 'library:filename d:set-source
dup 'library:.config d:set-source
dup 'library:cwd d:set-source
dup 'library:CWD d:set-source
dup 'library:.CONFIG d:set-source
dup 'HOME d:set-source
drop
~~~