[NTG-context] command line arguments

[Hraban Ramm <texml@fiee.net>]

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Following up on the other imposition question, I'm trying to make an 
example file that shows an imposition schema according to command line 
arguments.

This way it works for the number of pages, as used in 
\dorecurse{\Pages}{…}, but not for the imposition schema. Typesetting 
\Schema looks right, but \setuparranging doesn’t work. Where's my error?

\def\Schema{\doifelsedocumentargument{schema}{\getdocumentargument{schema}}{1*8}}

\def\Pages{\doifelsedocumentargument{numberofpages}{\getdocumentargument{numberofpages}}{16}}

\setuparranging[\Schema]

Find the full example attached, I call it like

context --autopdf=auto --arrange impositiontest.tex --schema=TRYPTICHON --numberofpages=32

Hraban

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% context --autopdf=auto --arrange --arguments=schema=2\*4,pages=16

\def\Schema{\doifelsedocumentargument{schema}{\getdocumentargument{schema}}{1*8}}
\def\Pages{\doifelsedocumentargument{numberofpages}{\getdocumentargument{numberofpages}}{16}}

\setuppapersize[A9,landscape][A7,landscape]

\setuparranging[\Schema]

\setupbodyfont[ss,10pt]

\setuplayout[margin=0pt, width=fit, header=2.8ex, footer=2.8ex]
\setupalign[middle,hilo]
\setuppagenumbering [alternative=doublesided,location=footer]
\setupheadertexts[\CONTEXT\ imposition test]

\showframe
\setupbackgrounds [text][text][background=color,backgroundcolor=lightgray]

% Where the block of pages is placed on the sheet
% (relevant if there is space left over.)
\setuplayout [location=middle,marking=on]

\startbuffer[Fakepage]
    \strut
    \blank
    \bold{[\Schema]}
    \vfill
    This is page \recurselevel
    \vfill
\stopbuffer

\starttext
\dorecurse{\Pages}{\getbuffer[Fakepage]\page}
\stoptext

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