If I define a music function to apply an arbitrary system command to a
file thusly,
sysinc =
#(define-music-function (p l cmd fname) (string? string?)
"Run system command, cmd, and redirect output to fname.
then include fname in input."
(system (string-concatenate (list cmd " > " fname)))
#{ \include $fname #})
and use it to preprocess an input file ,
\sysinc "cat junk.txt | sed 's/4/8/g'" "junk.inc"
it works as expected, BUT, I have to run LilyPond twice for changes in
the original file to show up in the lilypond output. Is there anyway
around this limitation?
Note: what I'm actually trying to do with the preprocessing, as
opposed to the trivial example above, is something that cannot be
done easily with a music function. I know about the --evaluate
command line option but that's also not practical for what I'm trying
to do.
Thanks,
Mike
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