ConTeXt enumerate in margin

Question

For short answer quiz, I like to provide an answerblank in right margin with same number as the question:

In pdfLaTeX I do this with a newcommand:

\newcommand{\ansblank}{\leavevmode\marginpar{\labelenumi\hrulefill\raggedright\par}

Then in enumerate environment:

\item\ansblank blah blah

In ConTeXt MKIV I can do (thanks to Marco):

\definemargindata [mymarginrule] [width=3.5cm,location=right,]
\define\ansblank
    {\inright{\getnumber[itemgroup:itemize]. \thinrules[n=1]}}

My problem is that I want to do this in ConTeXt MKII. Why? Euler font does not work for me in MKIV (TeXLive 2012 via MacTeX) and I am not able to keep up with MKIV changes. I want to use ConTeXt because of METAPOST integration and enhancements.

The line:

\define\ansblank{\inright\thinrule}

works in MKII but only gives a line in the right margin (obviously). Is there a \getnumber for MKII?

Sorry, I was not allowed to upload output image in original post (and still can't.) This should show what is desired:

1) Write the prime factors of 1001                                1) ___________

(Use of NeoEuler in mkiv might be another thread; I've had some trouble with it already.)

Answer 1

There is a \getnumber for MkII, but internally itemization are not implemented using numbers in MkII, rather they are implemented using counters. So, you have to explicitly convert the current item counter to the current item conversion (so that the solution works for \startitemize[a] etc.).

The second difference is that MkII does not have margindata. Since you do not need to control the stacking of margin content (the main feature of margindata, but simply want the margin content to be flushed on the same line where it is called, any of the simpler margin<something> will work. In the example below I use marginline which flushes in the same line where it is called.

Unlike margindata, marginline is not set inside a frame; so you need to wrap the content in a frame (to get a \vbox; which ensures that thinrules works).

With these changes, Marco's original solution gets translated to MkII as follows:

\setuplayout[rightmargin=3cm, width=fit, backspace=1cm, cutspace=3.2cm]


\definemarginline [mymarginrule] [location=right, width=\rightmarginwidth, distance=\rightmargindistance]

\defineframed
  [marginframed]
  [struct=yes,
   offset=overlay,
   frame=off,
   location=low,
   width=\rightmarginwidth,
   align=flushleft]

\define\myrules
    {\mymarginrule{\marginframed{\convertnumber\currentitemsymbol\currentitemnumber. \thinrules[n=1] }}}

\setupitemgroup [itemize] [a]
\setupitemgroup [itemize] [right=\myrules]

\starttext
    \startitemize
        \startitem \input knuth \stopitem
        \startitem \input ward \stopitem
    \stopitemize
\stoptext 

which gives