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%D \module
%D [ file=file-ini, % was supp-fil,
%D version=20110701, % 1995.10.10,
%D title=\CONTEXT\ File Macros,
%D subtitle=Helpers,
%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 \TEX\ operates on files, so one wouldn't wonder that there is a separate module
%D for file commands. In \CONTEXT\ files are used for several purposes:
%D
%D \startitemize[packed]
%D \item general textual input
%D \item logging status information
%D \item saving registers, lists and references
%D \item buffering defered textual input
%D \stopitemize
%D
%D When dealing with files we can load them as a whole, using the \type {\input}
%D primitive or load them on a line||by||line basis, using \type {\read}. Writing is
%D always done line by line, using \type {\write}.
\writestatus{loading}{ConTeXt File Macros / Helpers}
\registerctxluafile{file-ini}{}
\unprotect
%D \macros
%D {scratchread, scratchwrite}
%D
%D We define a scratch file for reading. Keep in mind that the number of files is
%D limited to~16, so use this one when possible. We also define a scratch output
%D file. In \MKIV\ and \LMTX\ we never use these file handles.
\ifdefined\scratchread \else \newread \scratchread \fi
\ifdefined\scratchwrite \else \newwrite\scratchwrite \fi
%D Seldom needed:
\def\openinputfile #handle#name{\immediate\openin #handle={#name}\relax}
\def\openoutputfile #handle#name{\immediate\openout#handle={#name}\relax}
\def\closeinputfile #handle{\immediate\closein #handle\relax}
\def\closeoutputfile#handle{\immediate\closeout#handle\relax}
%D \macros
%D {writeln}
%D
%D This saves a few tokens:
\def\writeln#handle{\write#handle{}}
%D \macros
%D {pushendofline,popendofline}
%D
%D When we are loading files in the middle of the typesetting process, for instance
%D when we load references, we have to be sure that the reading process does not
%D generate so called 'spurious spaces'. This can be prevented by assigning the line
%D ending character the \CATCODE\ comment. This is accomplished by
%D
%D \starttyping
%D \pushendofline
%D ... reading ...
%D \popendofline
%D \stoptyping
\installsystemnamespace{eolstack}
\newcount\c_system_files_eol_level
\unexpanded\def\pushendofline
{\advance\c_system_files_eol_level\plusone
\expandafter\chardef\csname\??eolstack\number\c_system_files_eol_level\endcsname\catcode\endoflineasciicode
\catcode\endoflineasciicode\commentcatcode}
\unexpanded\def\popendofline
{\catcode\endoflineasciicode\csname\??eolstack\number\c_system_files_eol_level\endcsname
\advance\c_system_files_eol_level\minusone}
\unexpanded\def\restoreendofline
{\catcode\endoflineasciicode\endoflinecatcode}
%D \macros
%D {startreadingfile,stopreadingfile}
%D
%D A low level capsule:
\newcount\readingfilelevel % no longer needed
\newtoks \everystartreadingfile
\newtoks \everystopreadingfile
\unexpanded\def\startreadingfile% beter een every en \setnormalcatcodes
{\global\advance\readingfilelevel\plusone
\the\everystartreadingfile
\pushcatcodetable % saveguard
\setcatcodetable\ctxcatcodes
\clf_pushregime}% temporarily this way
\unexpanded\def\stopreadingfile
{\popcatcodetable % saveguard
\clf_popregime % temporarily this way
\the\everystopreadingfile
\global\advance\readingfilelevel\minusone}
%D \macros
%D {input, normalinput}
%D
%D Sometimes we run into troubles when \type {\input} wants to get expanded, e.g. in
%D a \type {\write} (which happens in the metafun manual when we permit long MP
%D lines). So, instead of fixing that, we go for a redefinition of \type {\input}.
%D Of course it's better to use \type {\readfile} or \type {\processfile}.
\unexpanded\def\input{\normalinput}
\def\inputgivenfile#name{\normalinput{#name}}
%D \macros
%D {doifelsefile}
%D
%D The next alternative only looks if a file is present. No loading is done. This
%D one obeys the standard \TEX\ lookup.
%D
%D \starttyping
%D \doiffileelse {filename} {found} {not found}
%D \stoptyping
\unexpanded\def\doifelsefile {\clf_doifelsefileexist}
\unexpanded\def\doifelsepath {\clf_doifelsepathexist}
\unexpanded\def\doiffile #name{\clf_doifelsefileexist{#name}\firstofoneargument\gobbleoneargument}
\unexpanded\def\doifnotfile #name{\clf_doifelsefileexist{#name}\gobbleoneargument\firstofoneargument}
\let\doiffileelse\doifelsefile
\let\doifpathelse\doifelsepath
\let\doifelsefileexists\doifelsefile
\let\doifelsepathexists\doifelsepath
\let\doiffileexistselse\doifelsefileexists
\let\doifpathexistselse\doifelsepathexists
%D \macros
%D {doifparentfileelse}
%D
%D \starttyping
%D \doifparentfileelse{filename}{yes}{no}
%D \stoptyping
\ifdefined\outputfilename \else \def\outputfilename{\jobname} \fi
\unexpanded\def\doifelseparentfile{\clf_doifelseparentfile}
\let\doifparentfileelse\doifelseparentfile
%D \macros
%D {splitfilename}
%D
%D \startbuffer
%D \def\showfilesplit
%D {\bgroup \tttf
%D \hbox{(full: \splitofffull)}\space
%D \hbox{(path: \splitoffpath)}\space
%D \hbox{(base: \splitoffbase)}\space
%D \hbox{(name: \splitoffname)}\space
%D \hbox{(type: \splitofftype)}\space
%D \egroup}
%D
%D \splitfilename{c:/aa/bb/cc/dd.ee.ff} \showfilesplit \endgraf
%D \splitfilename{c:/aa/bb/cc/dd.ee} \showfilesplit \endgraf
%D \splitfilename{c:/aa/bb/cc/dd} \showfilesplit \endgraf
%D
%D \splitfilename{dd.ee.ff} \showfilesplit \endgraf
%D \splitfilename{dd.ee} \showfilesplit \endgraf
%D \splitfilename{dd} \showfilesplit \endgraf
%D \stopbuffer
%D
%D \start \typebuffer \getbuffer \stop
\newconstant\kindoffile % 0=normal 1=full path spec (or http) / set at the lua end
\def\splitoffroot{.} \newconstant\splitoffkind
\let\splitofffull\empty
\let\splitoffpath\empty
\let\splitoffbase\empty
\let\splitoffname\empty
\let\splitofftype\empty
\unexpanded\def\splitfilename{\clf_splitfilename}
%D \macros
%D {doonlyonce, doinputonce, doendinputonce}
%D
%D Especially macropackages need only be loaded once. Repetitive loading not only
%D costs time, relocating registers often leads to abortion of the processing
%D because \TEX's capacity is limited. One can prevent multiple execution and
%D loading by using one of both:
%D
%D \starttyping
%D \doonlyonce{actions}
%D \doinputonce{filename}
%D \doendinputonce{filename}
%D \stoptyping
%D
%D This command obeys the standard method for locating files. We could move this
%D function to the \LUA\ end.
\installsystemnamespace {fileonce}
\unexpanded\def\doonlyonce#whatever%
{\ifcsname\??fileonce#whatever\endcsname
\expandafter\gobbleoneargument
\else
\letgvalue{\??fileonce#whatever}\relax
\expandafter\firstofoneargument
\fi}
\unexpanded\def\doinputonce#name%
{\doonlyonce{#name}{\doifelsefile{#name}{\inputgivenfile{#name}}\donothing}}
\unexpanded\def\doendinputonce#name%
{\ifcsname\??fileonce#name\endcsname
\expandafter\endinput
\fi}
\unexpanded\def\forgetdoingonce#whatever%
{\global\undefinevalue{\??fileonce#whatever}}
\protect \endinput
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