lyv
lyv is a small set of tools to handle LilyPond data from Ruby. It is in no way general. Most of it was first written for my In adiutorium project and subsequently used also in other contexts. Thus the gem is primarily for my own purposes and available to anyone who might happen to need it.
It solves tasks like
- how many scores are defined in a given file?
- what, if any, are their lyrics?
- which header fields do they have? With what values?
- which fields does the top-level header have?
- get whole source of the n-th score or score meeting some requirements
require 'lyv'
parser = LilyPondParser.new
doc = parser.parse_document(File.read('path/to/MyMusic.ly'))
# top-level header fields
puts "#{doc.header['composer']}: #{doc.header['title']}"
# traverse scores and process their header fields and lyrics
doc.scores.each do |s|
puts "#{s.header['opus']}: #{s.lyrics}"
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If you want to process LilyPond files, you should consider the fact that most of the notation geeks seem to prefer Python as their scripting language. Particularly the python-ly library might fit your needs.
If python-ly was there at the time my need to parse, split, rearrange, programatically modify etc. LilyPond files emerged, I wouldn't have created any of the scripts that later became lyv.
license
GNU/GPL 3.0 or newer
the name
Liv is a women's name of Nordic origin. ly is an extension commonly used for Lilypond files.