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-%D \module
-%D   [       file=file-mod, % was supp-fil,
-%D        version=20110701, % 1995.10.10,
-%D          title=\CONTEXT\ File Macros,
-%D       subtitle=Resolvers,
-%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.
-
-%D We could move some more to the lua end (implementors).
-
-\writestatus{loading}{ConTeXt File Macros / Resolvers}
-
-\unprotect
-
-\registerctxluafile{file-res}{}
-
-%D \macros
-%D   {readfile,ReadFile}
-%D
-%D One cannot be sure if a file exists. When no file can be found, the \type
-%D {\input} primitive gives an error message and switches to interactive mode. The
-%D macro \type {\readfile} takes care of non||existing files. This macro has two
-%D faces.
-%D
-%D \starttyping
-%D \ReadFile {filename}
-%D \readfile {filename} {before loading} {not found}
-%D \stoptyping
-%D
-%D Many \TEX\ implementations have laid out some strategy for locating files. This
-%D can lead to unexpected results, especially when one loads files that are not
-%D found in the current directory. Let's give an example of this. In \CONTEXT\
-%D illustrations can be defined in an external file. The resizing macro first looks
-%D if an illustration is defined in the local definitions file. When no such file is
-%D found, it searches for a global file and when this file is not found either, the
-%D illustration itself is scanned for dimensions. One can imagine what happens if an
-%D adapted, localy stored illustration, is scaled according to dimensions stored
-%D somewhere else.
-%D
-%D When some \TEX\ implementation starts looking for a file, it normally first looks
-%D in the current directory. When no file is found, \TEX\ starts searching on the
-%D path where format and|/|or style files are stored. Depending on the
-%D implementation this can considerably slow down processing speed.
-%D
-%D In \CONTEXT, we support a project||wise ordening of files. In such an approach it
-%D seems feasible to store common files in a lower directory. When for instance
-%D searching for a general layout file, we therefore have to backtrack.
-%D
-%D These three considerations have lead to a more advanced approach for loading
-%D files.
-%D
-%D We first present an earlier implementation of \type {\readfile}. This command
-%D backtracks parent directories, upto a predefined level. Users can change this
-%D level (on the commandline using a directive); we default to~3.
-%D
-%D We use \type {\normalinput} instead of \type {\input} because we want to be able
-%D to redefine the original \type {\input} when needed, for instance when loading
-%D third party libraries.
-
-\let\readfilename\empty
-
-\def\syst_files_read_file#protocol#path#name% #true #false
-  {\edef\readfilename{\clf_getreadfilename{#protocol}{#path}{#name}}%
-   \ifempty\readfilename
-     \expandafter\secondoftwoarguments
-   \else
-     \expandafter\syst_files_read_file_indeed
-   \fi}
-
-\def\syst_files_read_file_indeed#true#false%
-  {#true%
-   \relax
-   \normalinput{\readfilename}%
-   \relax}
-
-%D \macros
-%D   {readjobfile,readlocfile,readsysfile,
-%D    readfixfile,readsetfile}
-%D
-%D This implementation honnors the third situation, but we still can get unwanted
-%D files loaded and/or can get involved in extensive searching.
-%D
-%D Due to different needs, we decided to offer four alternative loading commands.
-%D With \type {\readjobfile} we load a local file and do no backtracking, while
-%D \type {\readlocfile} backtracks~\number \maxreadlevel\ directories, including the
-%D current one.
-%D
-%D System files can be anywhere and therefore \type {\readsysfile} is not bound to
-%D the current directory and obeys the \TEX\ implementation.
-%D
-%D Of the last two, \type {\readfixfile} searches on the directory specified and
-%D backtracks too, while \type {\readsetfile} does only search on the specified
-%D path.
-%D
-%D The most liberal is \type {\readfile}.
-
-\permanent\protected\def\readjobfile     #name{\syst_files_read_file{job}    {.}{#name}} % current path, no backtracking
-\permanent\protected\def\readlocfile     #name{\syst_files_read_file{loc}    {.}{#name}} % current path, backtracking
-\permanent\protected\def\readsysfile     #name{\syst_files_read_file{sys}    {.}{#name}} % current path, obeys tex search
-\permanent\protected\def\readfixfile#path#name{\syst_files_read_file{fix}{#path}{#name}} % specified path, backtracking
-\permanent\protected\def\readsetfile#path#name{\syst_files_read_file{set}{#path}{#name}} % specified path, no backtracking
-\permanent\protected\def\readfile        #name{\syst_files_read_file{any}    {.}{#name}}
-\permanent\protected\def\ReadFile        #name{\syst_files_read_file{any}    {.}{#name}\donothing\donothing}
-
-%D So now we've got ourselves five file loading commands:
-%D
-%D \starttyping
-%D \readfile                {filename} {before loading} {not found}
-%D
-%D \readjobfile             {filename} {before loading} {not found}
-%D \readlocfile             {filename} {before loading} {not found}
-%D \readfixfile             {filename} {before loading} {not found}
-%D \readsysfile {directory} {filename} {before loading} {not found}
-%D \stoptyping
-
-\permanent\protected\def\readtexfile#name#true#false%
-  {\pushcatcodetable
-   \catcodetable\ctxcatcodes
-   \readfile{#name}{#true}{#false}%
-   \popcatcodetable}
-
-\permanent\protected\def\readxmlfile#name#true#false%
-  {\pushcatcodetable
-   \catcodetable\xmlcatcodes
-   \readfile{#name}{#true}{#false}%
-   \popcatcodetable}
-
-%D \macros
-%D   {doiflocfileelse,locfilename}
-%D
-%D \starttyping
-%D \doiflocfileelse {filename} {before loading} {not found}
-%D \stoptyping
-
-\permanent\protected\def\doifelselocfile#name{\clf_doifelselocfile{#name}}
-\permanent          \def\locfilename    #name{\clf_locfilename    {#name}}
-
-\aliased\let\doiflocfileelse\doifelselocfile
-
-\protect \endinput