11.2.8 Filename Manipulation

absolute_file_name(+R,-A)   hookable

absolute_file_name(+R,-A,+O)   hookable

expand relative filename R to absolute file name A using options specified in O

user:file_search_path(+F,-D)   hook

directory D is included in file search path F

user:library_directory(-D)   hook

D is a library directory that will be searched