On 2011-03-24 <18:42:12>, Cecil Westerhof wrote:
> 2011/3/24 Philipp Gesang <pgesang@ix.urz.uni-heidelberg.de>
> 
> > >      {\ctalua{context(modification_date("\jobname.tex", "#1"))}}
> >            ^
> > s/\\ctalua/\\ctxlua/
> >
> 
> I have:
> \startluacode
>   function modification_date(file, format)
>     local f    = file
>     local attr = lfs.attributes(f)
> 
>     assert (type(attr) == "table")
>     if attr.mode ~= "directory" then
>       if format == "long" then
>         return os.date("%Y-%m-%d %H:%M",attr.modification)
>       else
>         return os.date("%Y-%m-%d",attr.modification)
>       end
>     end
>   end
> \stopluacode
> 
> \def\getdate
>  {\dosingleempty\dogetdate}
> 
> \def\dogetdate[#1]%
>  {\ctxlua{context(modification_date("\jobname.tex", "#1"))}}
> 
> \starttext
> 
> \getdate
> 
> \getdate{"short"}

\getdate[long]
\getdate[nil]
\getdate[false]

In context optional args are specified in brackets. It’s all
documented on the wiki:
  http://wiki.contextgarden.net/Commands_with_optional_arguments

Regards, phg


> 
> \getdate{"long"}
> 
> \stoptext
> 
> This gives:
> 2011-03-24
> 2011-03-24"short"
> 2011-03-24"long"
> 
> -- 
> Cecil Westerhof

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