[example] basic style handler usage (for ConTeXt wiki)

stylealt.tex

% macros=mkvi
\unprotect %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\installnamespace {look}
\installcommandhandler \????look {look} \????look

\appendtoks
  \setuevalue{\currentlook}{\do_look{\currentlook}}
\to \everydefinelook

\unexpanded\def\do_look#id{%
  \edef\currentlook{#id}%
  \dosingleempty\do_do_look%
}

\def\do_do_look[#parms]#content{%
  \begingroup
  \iffirstargument\setupcurrentlook[#parms]\fi
  \uselookstyleandcolor\c!style\c!color%
  #content%
  \endgroup%
}

\protect %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\definelook [mybold]      [style=bold]
\definelook [myslant]     [style=slanted]
\definelook [myitalics]   [style=italic]
\definelook [mybig]       [style=bigger]
\definelook [mycaps]      [style=smallcaps]
\definelook [complicated] [style={\ssxx\bold\addff{oldstyle}}]

\starttext %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Ordinary Text Before
   \mybold   {bold text}
  \myslant   {slanted text}
\myitalics   {italic text}
    \mybig   {oversize text}
   \mycaps   {small capitals}
\complicated {0.5 + 14.134725i}
Ordinary Text After

\stoptext %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%