Re: Extracting a "score diff" from two [or more] Lilypond sources

[Jean Abou Samra]

Le 22/01/2022 à 22:51, Kieren MacMillan a écrit :
> Hi all!
>
> Given multiple Lilypond sources, I'm hoping to find a way to output a "diff 
> file" describing the musical differences *as would be perceived by a human reading 
> the score*. For example, given
>
>      Score #1 = \score { \new Staff << { c'1 c' } >> }
>
>      Score # 2 = \score { \new Staff \new Voice << { c'1*1/2 s2 c''1 } >> }
>
> diff ( Score1 , Score2 ) would say [in effect] "m2: Score #1 has c'1 while Score #2 
> has c''1."
>
> Because coding style, "hacks" (like c'1*1/2 s2), variable/context separation, and other 
> code-based differences aren't [directly] relevant, I can't just use standard text/diff tools. Is 
> there a way two "music streams" (oof, I'm definitely talking out my butt right now!) can 
> be compared in Lilypond and some/most/all of the human-perceivable musical differences be 
> automatically detected?
>
> Thanks for any brainstorms, ideas, or (dare I dream!?) snippets!
> Kieren.


You could actually output the music stream using
\include "event-listener.ly", and do a textual diff.
I guess that provides a start?

Best,
Jean