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+%D \module
+%D   [       file=spac-fil,
+%D        version=2013.01.13,
+%D          title=\CONTEXT\ Spacing Macros,
+%D       subtitle=Fillers,
+%D         author={Hans Hagen and Wolfgang Schuster},
+%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 Spacing Macros / Fillers}
+
+\unprotect
+
+%D A bit more extensive variant of a prototype posted by Wolfgang to the
+%D development list. Instead of dealing with a few leader types it makes
+%D sense to support them all as well as simple rule fillers. Eventually we
+%D can also use in for the mathfillers. We distinguish between alternatives
+%D and with them methods, and a checker is provided for use in applying
+%D e.g.\ fillers in lists.
+
+\installcorenamespace{filler}
+\installcorenamespace{filleralternative}
+\installcorenamespace{fillerleadermethod}
+
+\installcommandhandler \??filler {filler} \??filler
+
+\let\setupfillers\setupfiller
+
+\unexpanded\def\filler
+  {\dosingleempty\spac_fillers_indeed}
+
+\unexpanded\def\checkedfiller#1%
+  {\ifcsname\namedfillerhash{#1}\s!parent\endcsname
+     \spac_fillers_indeed[#1]%
+     \expandafter\gobbleoneargument
+   \else
+     \expandafter\firstofoneargument
+   \fi{#1}}
+
+\def\spac_fillers_indeed[#1]%
+  {\removeunwantedspaces
+   \begingroup
+   \edef\currentfiller{#1}%
+   \usefillerstyleandcolor\c!style\c!color
+   \scratchdimen\fillerparameter\c!leftmargin\relax
+   \ifdim\scratchdimen=\zeropoint\else
+     \hskip\scratchdimen
+   \fi
+   \fillerparameter\c!left\relax
+   \expandnamespaceparameter\??filleralternative\fillerparameter\c!alternative\s!unknown\relax
+   \fillerparameter\c!right\relax
+   \scratchdimen\fillerparameter\c!rightmargin\relax
+   \ifdim\scratchdimen=\zeropoint\else
+     \hskip\scratchdimen
+   \fi
+   \endgroup
+   \ignorespaces}
+
+\setvalue{\??filleralternative\s!unknown}%
+  {}
+
+\setvalue{\??filleralternative\v!symbol}%
+  {\expandnamespaceparameter\??fillerleadermethod\fillerparameter\c!method\v!local
+     \ifdim\fillerparameter\c!offset>\zeropoint
+        \simplealignedspreadbox
+          {2\dimexpr\fillerparameter\c!offset\relax}%
+          {\fillerparameter\c!align}%
+          {\fillerparameter\c!symbol}%
+     \else
+        \simplealignedbox
+          {\fillerparameter\c!width}%
+          {\fillerparameter\c!align}%
+          {\fillerparameter\c!symbol}%
+     \fi
+   \hfill}
+
+\setvalue{\??filleralternative\v!stretch}%
+  {\hfill}
+
+\setvalue{\??filleralternative\v!space}%
+  {\hskip\fillerparameter\c!distance\relax}
+
+\setvalue{\??filleralternative\v!rule}%
+  {\expandnamespaceparameter\??fillerleadermethod\fillerparameter\c!method\v!local
+     \hrule
+       \!!height\fillerparameter\c!height
+       \!!depth \fillerparameter\c!depth
+   \hfill}
+
+\letvalue{\??fillerleadermethod\s!local }\normalleaders  % overflow ends up inbetween (current box)
+\letvalue{\??fillerleadermethod\v!global}\normalgleaders % overflow ends up inbetween (outermost box)
+\letvalue{\??fillerleadermethod\v!middle}\normalcleaders % overflow ends up before, after (current box)
+\letvalue{\??fillerleadermethod\v!broad }\normalxleaders % overflow ends up before, inbetween, after (current box)
+
+\setupfillers
+  [\c!width=\emwidth,
+   \c!symbol=.,
+   \c!distance=\emwidth,
+   \c!offset=\zeropoint,
+   \c!align=\v!middle,
+   \c!height=.1\exheight,
+   \c!depth=\zeropoint,
+   \c!leftmargin=\zeropoint,
+   \c!rightmargin=\zeropoint,
+   \c!alternative=\v!symbol,
+   \c!method=\s!local]
+
+\definefiller
+  [\v!sym]
+  [\c!method=\v!global,
+   \c!width=.5\emwidth,
+   \c!leftmargin=.5\emwidth,
+   \c!rightmargin=.5\emwidth]
+
+\definefiller
+  [\v!symbol]
+  [\c!method=\v!global,
+   \c!offset=.125\emwidth,
+   \c!leftmargin=.5\emwidth,
+   \c!rightmargin=.5\emwidth]
+
+\definefiller
+  [\v!rule]
+  [\c!alternative=\v!rule,
+   \c!leftmargin=.5\emwidth,
+   \c!rightmargin=.5\emwidth]
+
+\definefiller
+  [\v!width]
+  [\c!alternative=\v!stretch]
+
+\definefiller
+  [\v!space]
+  [\c!alternative=\v!space,
+   \c!distance=3\emwidth]
+
+% maybe box -> symbol
+
+\protect \endinput
+
+% \definefiller[test-a][alternative=stretch]
+% \definefiller[test-b][alternative=symbol,symbol=!]
+% \definefiller[test-c][alternative=rule,height=.1ex,leftmargin=.5em,rightmargin=.25em]
+
+% \starttext
+%     text\filler[test-a]text \par
+%     text\filler[test-b]text \par
+%     text\filler[test-c]text \par
+%     text\checkedfiller{<nothing>}text \par
+% \stoptext