On 30 Aug 2010, at 05:56, Wilfred van Rooijen wrote:
> The (more dificult) solution could be to make a shell script which will run
> the compilation of the xelatex source and detect whether or not the run was
> succesfull - if not, change the input file to the other font and retry.
I'm surprised no-one has suggested the straightforward, pure-xetex approach:
something along these lines (untested).....
\def\myfont{"Myriad Pro"}
\def\myfallback{"Arial"}
\count255=\interactionmode
\batchmode
\font\foo=\myfont\space at 10pt
\ifx\foo\nullfont
\font\foo = \myfallback\space at 10pt
\ifx\foo\nullfont
\errorstopmode
\errmessage{no suitable font found}
\else
\let\myfont=\myfallback
\fi
\fi
\interactionmode=\count255
% and now proceed to use \myfont.....
JK
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