Hi list, I'm looking for some advice from scheme experts with regard to writing pure functions. I've written a Grob and engraver (attached) for the purpose of setting long text instructions which should be wrapped over a section of music. Obviously the height of the resulting stencil will vary depending on the ultimate width of the spanner.
Thus I've added an unpure-pure container for the Y-extent callback. This is basically working, but any advice on how to improve the pure estimate would be greatly appreciated. For now I'm simply using the difference of the paper-column ranks to give an indication of the horizontal length. This tends to estimate a larger height than is required (which is better than too small), but leads to some wasted vertical space. Thanks, Mark
instructionMark.ily
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-- Mark Knoop
