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+%D \module
+%D   [       file=file-syn, % was core-fil,
+%D        version=20110701, % 1997.11.15,
+%D          title=\CONTEXT\ File Macros,
+%D       subtitle=Module Support,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\writestatus{loading}{ConTeXt File Macros / Synonyms}
+
+\unprotect
+
+\registerctxluafile{file-syn}{1.001}
+
+%D \macros
+%D   {definefilesynonym,definefilefallback}
+%D
+%D One of the problems with loading files is that their names
+%D can depend on the interface language. We therefore need a
+%D method to define filesynonyms. The actual synonyms are
+%D defined elsewhere, but look like:
+%D
+%D \starttyping
+%D \definefilesynonym [chemic]  [chemie]
+%D \definefilesynonym [einheit] [unit]
+%D \definefilesynonym [unit]    [unit]
+%D \stoptyping
+%D
+%D So we can say in english:
+%D
+%D \starttyping
+%D \usemodules[pictex,chemic,unit]
+%D \stoptyping
+%D
+%D and in dutch:
+%D
+%D \starttyping
+%D \usemodules[pictex,chemie,unit]
+%D \stoptyping
+
+\unexpanded\def\definefilesynonym {\dodoubleempty   \syst_files_define_synonym }
+\unexpanded\def\definefilefallback{\dodoubleargument\syst_files_define_fallback} % still used?
+
+\def\syst_files_define_synonym     [#name][#realname]{\ctxcommand{definefilesynonym ("#name","#realname")}}
+\def\syst_files_define_fallback[#name][#alternatives]{\ctxcommand{definefilefallback("#name","#alternatives")}}
+
+%D \macros
+%D   {truefilename}
+%D
+%D At the system level such a filename can be called upon by
+%D saying:
+%D
+%D \starttyping
+%D \truefilename{filename/filesynonym}
+%D \stoptyping
+%D
+%D The implementation shows that nesting is supported.
+
+\def\truefilename#1{\ctxcommand{truefilename("#1")}}
+
+\protect \endinput