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Grand PartCombine Rewrite Project

From: Kieren MacMillan
Subject: Grand PartCombine Rewrite Project
Date: Mon, 14 Sep 2009 12:37:59 -0400

Hello all,

I've decided this is going to be my pet project during this, my "Autumn of Lilypond". I've started a separate thread here, and would like to get moving on the project as soon as possible. [n.b. I am not intending to cross- post to -user after this "announcement" email.]

1. Team members. Several people (Wol, etc.) expressed an interest in helping; if you are one of these, please re-confirm your interest here, for thread completeness. If anyone else wants to help, just shout out.

2. Lead(s). I don't mind taking the lead on this if nobody else wants that job; however, if anyone *does* want it, I can guarantee you'll do better than I, and am happy to defer.

3. Programming. In order to get this done before, say, 2020, we'll need at least one lead developer with good Scheme-fu to (1) write most of the heavy-lifting code, and/or (2) vet my/our Froggie work. In either case, my goal is to have "clean" patches to give to Carl/ whomever for final merging, as opposed to banging on his/their door with sketchy code.

4. Here's my first, naive attempt at listing the areas where a good partcombine must Do The Right Thing:
  — \relative
  — \transpose
  — \times
  — lyrics
  — merging/discarding notes & rests
  — merging/discarding text (e.g., markup)
  — merging/discarding articulations, etc.
  — adding "editorial" texts (e.g., "a2")
  — unlimited number of parts

5. My 30000-foot plan on how to proceed is to:
— dissect the current implementation to see if anything can be saved/rewritten;
   — plan the implementation revision/rewrite; and;
   — do it.

Any thoughts/help would be greatly appreciated.


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