%D \module
%D   [       file=typo-lan,
%D        version=2013.03.22,
%D          title=\CONTEXT\ Typesetting Macros,
%D       subtitle=Language Goodies,
%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 Typography Macros / Languages}

\unprotect

\registerctxluafile{typo-lan}{}

%D \macros
%D   {averagecharwidth, charwidthlanguage}
%D
%D This is a more \MKIV-ish variant of lang-frq.mkiv. The methods are
%D gone as one doesn't need the tables for them. The main macro is
%D \type {\averagecharwidth} which behaves like a dimension register.
%D
%D I finally decided to reimplement this as I needed it for a manual
%D (which is often a reason for such a rewrite). With some inspiring
%D Porcupine Tree in the background it's not the worst thing to do.

\def\charwidthlanguage{\currentmainlanguage}

\def\averagecharwidth   {\dimexpr\clf_averagecharwidth{\charwidthlanguage}\scaledpoint\relax}
\def\languagecharwidth#1{\dimexpr\clf_averagecharwidth{#1}\scaledpoint\relax}

\protect

\continueifinputfile{typo-lan.mkiv}

\setuplayout[backspace=4cm]

\showframe

\starttext

\startbuffer

\mainlanguage[en] \hsize65\averagecharwidth \normalexpanded{\inleft{\the\hsize}} \input ward \par
\mainlanguage[de] \hsize65\averagecharwidth \normalexpanded{\inleft{\the\hsize}} \input ward \par
\mainlanguage[nl] \hsize65\averagecharwidth \normalexpanded{\inleft{\the\hsize}} \input ward \par

\stopbuffer

\getbuffer \blank

\switchtobodyfont[pagella]

\getbuffer \blank

\switchtobodyfont[tt,8pt]

\getbuffer

\stoptext