[NTG-context] confusion about expansion

Lars Huttar lars_huttar at sil.org
Wed Mar 12 15:00:05 CET 2014

I've got a running page head like this in my document:


\def\Markname { Compiled \date by \CurrentUser  \LUATEX +\ConTeXt\
\contextversion }

and later:


But when I run this, I get a UCS error that seems to indicate that the
*result* of \CurrentUser ("waxhaw\huttar") is getting parsed as a
command sequence.

Here's the error:

! Undefined control sequence.

 1 >>  % see ConTeXt wiki http://wiki.contextgarden.net/Imposition#Cut_marks
 3     %% TODO: make sure this doesn't reevaluate every time
 4     %% the command sequence is used!
 5     \define\CurrentUser{\cldcontext{os.resultof"whoami"}}
 7     \def\Markname { Compiled \date by \CurrentUser  \LUATEX
+\ConTeXt\ \conte
xtversion. SVN  }

l.1 waxhaw\huttar

\cldcontext #1x-\directlua {context(#1)}

\Markname #- Compiled \date by \CurrentUser
                                            \LUATEX +\ConTeXt \
l.24 ...t=lefttop,x=3cm,y=-1.5\lineheight]{\Markname

How can I change the definition of \CurrentUser, or \Markname, to output
the result of \CurrentUser as-is, instead of parsing the result?
I tried (somewhat blindly) changing \def to \define, but it didn't make
any difference.

At the same time, I want to make sure that the processor won't be making
an OS system call to "whoami" every time \CurrentUser is evaluated: I
want it to happen only once, when \CurrentUser is defined.

Here is my complete working example:


\def\Markname { Compiled \date by \CurrentUser \LUATEX +\ConTeXt\
\contextversion. }








Thanks for any help.

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