John Chambers wrote:
> Laura writes:
> | I think the problem is that parsing lilypond files is more complicated
> | because they potentially have more structure than ABC files, and can
> | have includes, etc. I don't know how difficult what you do with the
> | ABC would be in practice.
>
> I think you're right. Includes are especially troublesome. The reason
> is that the directory structure that a program sees from the web is
> not necessarily the same as what a local program sees in the file
> system. If the include is of a file in another directory, a web
> program can't always correctly calculate what the URL should be.
> Probably the only includes you could implement would be for files in
> the same directory.
True. For example, most Lilypond files include (e.g.):
\include "paper16.ly"
where paper16.ly is a standard Lilypond include. However, most actual
includes that you'll care about would be local files, I imagine. The
only problem that I'd see there is if the Lilypond file is a symbolic
link to somewhere on the file system that _really_ has the file in it,
in which case the ancillary files might be in that directory.
>
> Of course, if lilypond had an include that used URLs rather than
> local file names, this wouldn't be a problem. Such includes are quite
> easy to implement.
As far as I know, this isn't allowed with Lilypond.
>
> Another big problem I can see: If my tune index includes, .lp files,
> people will be expecting the tune finder to extract single tunes and
> return them in PS or GIF or MIDI or whatever formats. The obvious way
> to do this is an lp2abc script ...
Ack, no, definitely not. Lilypond (.ly) files are much more complex
than ABC files, and making a translator would be very difficult
(although possible). Lilypond includes a "ly2dvi" program which
translates Lilypond to DVI and (optionally) PostScript and MIDI. Now,
the only tricky part is that within the .ly file itself is where the
\paper {...} and \midi {...} declarations occur, which instruct ly2dvi
to create paper and MIDI. So you'd probably have to search in the .ly
file and add your own \paper {} and \midi {} declarations if they
weren't there (which they almost always are).
- Eric
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