Re: stdin input

[Maurizio Tomasi]

> Maurizio Tomasi wrote:
> > Is it possible to force Lilypond to read a .ly file from the console?
> > Calling `ly2dvi' without arguments gives an help screen, and `ly2dvi -'
> > gives an error.
> >
> > Maurizio
>
> What do you mean?
> I usually just run
>
> 'ly2dvi file.ly'
>
> and i get the .dvi out of it. and the .midi when i have a \midi {} in
> the ly file...
>
> Jule

Yes, but suppose you want to pre-process your .ly file with m4 or cpp.
If ly2dvi does not support reading files from console, you have to
write:

-------------------------------------------------------------------------
% m4 --define=SOMEMACRO test.ly > test-temp.ly
% ly2dvi test-temp.ly
% rm test-temp.ly -f              (in fact, this is optional...)
-------------------------------------------------------------------------

But if Ly2dvi supported some `-'-like param, then I could write:

-------------------------------------------------------------------------
% m4 --define=SOMEMACRO test.ly | ly2dvi -o test.dvi -
-------------------------------------------------------------------------

without creating a temporary file, since ly2dvi would read the Mudela code
from the console.

It would not be a "great" feature, but sometimes it could be handy to have
it...

Maurizio