[frogs] Enhancement request: Define output-suffix as a configurable context property.

[Ian Hulin <ian@xxxxxxxxxxxx>]

This is a follow-on from trackers 404 and 714.  I'm very aware that we 
haven't yet followed through on Graham's original request, but have only 
fixed some bugs which were in the way.

I'd like to be able to set the output-prefix as a context property, so 
we could code stuff like (in MyFile.ly):

\book
{
    \score \with {output-prefix = "VocalScore"}
    {
        << \vocalMusic >>
    }
}

\book
{
    \score \with {output-prefix = "PianoVocalScore"}
    {
        <<
            \new Staff << \vocalMusic >>
            \new PianoStaff << \pianoMusic >>
       >>
    }
}

which would generate the files MyFile-VocalScore.pdf and 
MyFile-PianoVocalScore.pdf.

Valentin, could we have a tracker, please?

Also, could anyone who could give me a steer into defining a new context 
property give me a pointer as to where to look in the code for examples 
where this is implemented for existing properties?  I'd really like to 
have access to an exemplar.

At the moment I'm struggling with issues like:
Do I need to define the property and access routines C++, i.e. add the 
new property, accessor routine prototypes and code in score.hh and 
score.cc, with scheme bindings in score-scheme.cc. However, looking at 
the code it looks like the Score class is relatively light and only has 
 properties like
music_, input_location_ header_, defs_ user_key_ and error_found_.

So lilypond properties which can be applied to \score blocks, like 
autoAccidentals must use a different mechanism.

However, I'm having a hard time using git grep to discover what this is.

If anyone can shed some light on this, I'd be really grateful.

Cheers,

Ian Hulin

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