extending ly2dvi

[Werner LEMBERG]

Dear friends,


what do you think about extending ly2dvi by an option

  --pre <preprocessor>

which calls the named preprocessor on the input before doing anything
else?

Example

  ly2dvi --pre m4 input.m4

which expands internally to

  m4 input.m4 > input.ly
  ly2dvi input.ly

An alternative and/or additional option would be to allow a special
keyword `preprocessor' in the \header block:

  \header {
    preprocessor = m4
  }

The latter method appears to be quite elegant IMHO.

I'm not sure whether this is a security issue, but similar features
exist for TeX.


    Werner


PS: m4 seems to be suited well for preprocessing LilyPond input; at
    least I've used it successfully.