Re: Problem with understanding \doifemptyelse

[Hans Hagen <pragma@wxs.nl>]

At 12:26 PM 3/22/2002 +0100, Gilles Pérez-Lambert wrote:
>Hello,
>
>I'm trying to setup headers in such a manner that on the left pages I have 
>the chapter title and on the right the section one; but if there's no 
>section, I want the chapter one...
>
>I tried:
>%%%%%%%%
>\setupheadertexts
>[][{%
>\inframed[align=middle,frame=off,bottomframe=on,width=\makeupwidth]%
>{\itx\hfill%
>\doifemptyelse{\getmarking[section]}%%% If section header is empty
>{\getmarking[chapter]}% Take the chapter one
>{\getmarking[section]}}% else we take the section header
>}]
>[{\inframed[align=middle,frame=off,bottomframe=on,width=\makeupwidth]{\itx\
>getmarking[chapter]\hfill\null}}][]
>%%%%%%%%
>
>I know I must miss something: \getmarking[section] is surely not that 
>empty when there's nothing but my TeX knowledge is not that deep.

you're right, since \getmarking is doing a couple of things, it's never 
empty (for instance there is the test macro in there), instead use the low 
level fetcher:

\fetchmark[chapter][first]

(in supp-box (texexec --modu --pdf supp-box) you will find macros like 
\doifcontent that you can also use for such purposes)

Hans

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