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+%D \module
+%D   [       file=typo-dir,
+%D        version=2009.03.27, % code moved from core-spa.mkiv
+%D          title=\CONTEXT\ Typesetting Macros,
+%D       subtitle=Directions,
+%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 Typesetting Macros / Directions}
+
+%D At some point we might default to method 'two' but first I need to make it more
+%D efficient (and provide some options). I also want to have some basic tracing.
+
+\unprotect
+
+\registerctxluafile{typo-dir}{optimize}
+\registerctxluafile{typo-dha}{}
+%registerctxluafile{typo-dua}{}
+%registerctxluafile{typo-dub}{}
+\registerctxluafile{typo-duc}{autosuffix}
+
+\definesystemattribute[directions][public,pickup]
+
+\installcorenamespace{directions}
+\installcorenamespace{directionsbidimode}
+
+% plural as we can have a combination but maybe better singular
+
+\installsimplecommandhandler \??directions {directions} \??directions % no \define... yet
+
+\immutable\edef\lefttorightmark{\normalUchar"200E} \aliased\let\lrm\lefttorightmark % expandable
+\immutable\edef\righttoleftmark{\normalUchar"200F} \aliased\let\rlm\righttoleftmark % expandable
+
+\permanent\protected\def\setdirection[#1]% todo: symbolic names
+  {\clf_setdirection#1\relax}
+
+\permanent\protected\def\resetdirection
+  {\c_attr_directions\attributeunsetvalue}
+
+\newconstant\directionsbidimode % this one might become pivate
+
+% \setupdirections[bidi=global,method=default]
+% \setupdirections[bidi=global,method=one]
+% \setupdirections[bidi=global,method=two]
+% \setupdirections[bidi=global,method=two,fences=no]
+
+% maybe use chardefs
+
+\mutable\let\currentbidimode\empty
+\mutable\let\currentbidistamp\empty
+
+\def\typo_dir_get_mode
+  {\def\currentbidimode{\clf_getbidimode % test edef
+        scope  {\directionsparameter\c!bidi}%
+        method {\directionsparameter\c!method}%
+        fences {\directionsparameter\c!fences}%
+   }%
+   \gletcsname\??directionsbidimode\currentbidistamp\endcsname\currentbidimode}
+
+\appendtoks
+    \edef\p_bidi{\directionsparameter\c!bidi}%
+    \edef\currentbidistamp
+      {\p_bidi
+      :\directionsparameter\c!method
+      :\directionsparameter\c!fences}%
+    \expandafter\let\expandafter\currentbidimode\csname\??directionsbidimode\currentbidistamp\endcsname
+    \ifrelax\currentbidimode
+        \typo_dir_get_mode
+    \fi
+    \directionsbidimode\currentbidimode\relax
+    \ifcase\directionsbidimode
+        \resetdirection
+    \else
+        \setdirection[\number\directionsbidimode]%
+    \fi
+    \ifx\p_bidi\v!global
+        \pickupdirectionsattribute % pagebuilder
+    \else
+        \forgetdirectionsattribute
+    \fi
+\to \everysetupdirections
+
+\appendtoks
+    \edef\p_option{\directionsparameter\c!break}% name can change
+    \bitwiseflip\normalizelinemode\ifx\p_option\v!both\else-\fi\breakafterdircode
+\to \everysetupdirections
+
+% bidi: local=obey grouping, global=ignore grouping (unicode has no grouping)
+
+\setupdirections % maybe start/stop
+  [\c!bidi=\v!off,
+   \c!method=\v!default,
+   \c!break=\v!both, % experimental value, maybe \v!no will be default (bad name too)
+   \c!fences=\v!yes]
+
+\permanent\protected\edef\bidilre{\normalUchar"202A}
+\permanent\protected\edef\bidirle{\normalUchar"202B}
+\permanent\protected\edef\bidipop{\normalUchar"202C}
+\permanent\protected\edef\bidilro{\normalUchar"202D}
+\permanent\protected\edef\bidirlo{\normalUchar"202E}
+
+\permanent\protected\def\dirlre{\ifcase\directionsbidimode\or\bidilre\or\textdirection\directionlefttoright\fi}
+\permanent\protected\def\dirrle{\ifcase\directionsbidimode\or\bidirle\or\textdirection\directionrighttoleft\fi}
+\permanent\protected\def\dirlro{\ifcase\directionsbidimode\or\bidilro\or\setdirection[3]\fi}
+\permanent\protected\def\dirrlo{\ifcase\directionsbidimode\or\bidirlo\or\setdirection[4]\fi}
+
+% for the moment: \setdirection[\plusone]
+
+\definecolor[bidi:left:original] [r=.6]
+\definecolor[bidi:left:reversed] [g=.6]
+\definecolor[bidi:right:original][b=.6]
+\definecolor[bidi:right:reversed][r=.6,g=.6]
+\definecolor[bidi:mirrored]      [r=.6,b=.6]
+
+\protect \endinput
+
+% bidi test
+
+% \definefontfeature
+%   [arab]
+%   [mode=node,language=dflt,script=arab,
+%    init=yes,medi=yes,fina=yes,isol=yes,
+%    liga=yes,dlig=yes,rlig=yes,clig=yes,
+%    mark=yes,mkmk=yes,kern=yes,curs=yes]
+%
+% \font\Arabic=arabtype*arab at 20pt
+%
+% \def\LATIN{LATIN} {\setdirection[1]} % enable this
+% \def\ARAB {عربي}
+%
+% \startluacode
+%     function documentdata.split_tokens(str)
+%         for s in str:bytes() do
+%             context.sprint(tex.ctxcatcodes,string.format("\\hbox{\\char %s}",s))
+%         end
+%     end
+% \stopluacode
+%
+% \protected\def\biditest#1#2#3% font text raw
+%   {\dontleavehmode\hbox
+%     {\framed[offset=overlay]{\tttf#2}\quad
+%      \enabletrackers[typesetters.directions]%
+%      \framed[offset=overlay]{#1#3}\quad
+%      \disabletrackers[typesetters.directions]%
+%      \tttf\ctxlua{documentdata.split_tokens([[\detokenize{#3}]])}}}
+%
+% \startbuffer[bidi-sample]
+% \biditest\Arabic{LATIN BARA}{\lefttoright\relax   \LATIN\ \ARAB}\par
+% \biditest\Arabic{BARA LATIN}{\righttoleft\relax   \LATIN\ \ARAB}\par
+% \biditest\Arabic{LATIN ARAB}{\lefttoright{\bidilro \LATIN\ \ARAB}}\par % right -> left
+% \biditest\Arabic{LATIN ARAB}{\righttoleft{\bidilro \LATIN\ \ARAB}}\par % right -> left
+% \biditest\Arabic{BARA NITAL}{\lefttoright{\bidirlo \LATIN\ \ARAB}}\par % left -> right
+% \biditest\Arabic{BARA NITAL}{\righttoleft{\bidirlo \LATIN\ \ARAB}}\par % left -> right
+% \stopbuffer
+%
+% \startbuffer[bidi-sample]
+% \biditest\Arabic{LATIN BARA}{\lefttoright\relax   \LATIN\ \ARAB}\par
+% \biditest\Arabic{BARA LATIN}{\righttoleft\relax   \LATIN\ \ARAB}\par
+% \biditest\Arabic{LATIN ARAB}{\lefttoright\bidilro \LATIN\ \ARAB}\par % right -> left
+% \biditest\Arabic{LATIN ARAB}{\righttoleft\bidilro \LATIN\ \ARAB}\par % right -> left
+% \biditest\Arabic{BARA NITAL}{\lefttoright\bidirlo \LATIN\ \ARAB}\par % left -> right
+% \biditest\Arabic{BARA NITAL}{\righttoleft\bidirlo \LATIN\ \ARAB}\par % left -> right
+% \stopbuffer
+%
+% \startbuffer[bidi-setup]
+% \setupdirections[bidi=off]
+% \stopbuffer
+%
+% {\typebuffer[bidi-setup] \getbuffer[bidi-setup] \getbuffer[bidi-sample]}
+%
+% \startbuffer[bidi-setup]
+% \setupdirections[bidi=global]
+% \stopbuffer
+%
+% {\typebuffer[bidi-setup] \getbuffer[bidi-setup] \getbuffer[bidi-sample]}
+%
+% \startbuffer[bidi-setup]
+% \setupdirections[bidi=local]
+% \stopbuffer
+%
+% {\typebuffer[bidi-setup] \getbuffer[bidi-setup] \getbuffer[bidi-sample]}
+%
+% \startbuffer[bidi-sample]
+% \setupdirections[bidi=global]
+%
+%                   \hbox{\righttoleft\arabicfont (0001)}\par
+%    \dontleavehmode\hbox{\righttoleft\arabicfont (0002)}\par
+%                        {\righttoleft\arabicfont (0003)\par}
+%                        {\righttoleft\arabicfont (0004)}\par
+%         \dontleavehmode{\righttoleft\arabicfont (0005)\par}
+%         \dontleavehmode{\righttoleft\arabicfont (0006)}\par
+%                \rtlhbox{\arabicfont (0007)}\par
+%                \ltrhbox{\arabicfont (0008)}\par
+% \dontleavehmode\rtlhbox{\arabicfont (0009)}\par
+% \dontleavehmode\ltrhbox{\arabicfont (0010)}\par
+% \stopsetups
+%
+% {\typebuffer[bidi-sample]  \getbuffer[bidi-sample]}
+%
+% \stoptext