The underneath example works with
\def\myHeader{\iftuut chapter\else high\fi}
How do you make it work with\def\myHeader{\doifmodelse{a}{chapter}{high}} ?
( without resorting to \doifmodeelse{a}{\tuuttrue}{\tuutfalse} )
\showframe
\newif\iftuut
%\tuuttrue
\tuutfalse
\setuppagenumbering[location=footer]
\setupheadertexts[\doifoddpageelse{right page}{left page}]
\definetext[chapter][header][chapter page]
\def\myHeader{\doifmodelse{a}{chapter}{high}}
%\def\myHeader{\iftuut chapter\else high\fi}
\setuphead
[chapter]
% [header=chapter]
% [header=high]
[header=\myHeader]
\starttext
\dorecurse{2}{\chapter{Chapter #1}\dorecurse{20}{\input knuth\par}}
\stoptext
---
! Undefined control sequence.
\myHeader ->\doifmodelse
{a}{chapter}{high}
\doifvaluesomething ...inga {\csname #1\endcsname
}\ifx \!!stringa \empty
\e...
<argument> ...ething {\??ko \v!chapter \c!header }
{\setuplayouttext
[\v!hea...
\firstoftwoarguments #1#2->#1
<argument> ...BB {\v!chapter }\v!header \c!header
\dohandlepagebreakBB
{\v!c...
\firstofoneargument #1->#1
...
l.23 ...apter #1}\dorecurse{20}{\input knuth\par}}
---
Alan
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