Re: [NTG-context] confusion about expansion

Am 12.03.2014 um 15:12 schrieb Lars Huttar :

On 3/12/2014 10:05 AM, Wolfgang Schuster wrote:

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Am 12.03.2014 um 15:00 schrieb Lars Huttar :

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

\def\CurrentUser{\cldcontext{os.resultof"whoami"}}

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

and later:

\setlayer[cropmark][preset=lefttop,x=3cm,y=-1.5\lineheight]{\Markname}

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. When you want to pass a backslash to Lua you have to use \letterbackslash.

Thanks... can you give me an example of what that would look like? I don't think I want to pass a backslash to Lua, so I'm not sure how to apply what you're saying. Or are you using "Lua" here in the sense of LuaTeX?

A backslash appears in the output of os.resultof"whoami"; do I need to perform some processing on that output in order to escape backslashes?

Try this: \def\CurrentUser{\cldcontext{os.resultof"whoami"}} \def\Markname{Compiled \date by \detokenize\expandafter{\CurrentUser} \LUATEX +\ConTeXt\ \contextversion.} \setuplayout[location=middle,marking=on] \definelayer[cropmark][state=repeat,width=\paperwidth,height=\paperheight] \setupbackgrounds[page][background=cropmark] \setlayer[cropmark][preset=lefttop,x=3cm,y=1.5\lineheight]{\Markname} \starttext Foo \stoptext Wolfgang