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Tool and library for manipulating LilyPond files

Project description

This package provides a commandline program ly that can be used to do various manipulations with LilyPond files. LilyPond (www.lilypond.org) is a music typsetter using a plain text input file format.

This package also provides a Python library ly containing various Python modules to parse, manipulate or create LilyPond files.

The python-ly package is Free Software, licensed under the GPL. This package is written by the Frescobaldi developers and part of the Frescobaldi project. The main author is Wilbert Berendsen.

### Functionality of the ly commandline tool:

With ly you can reformat, or re-indent LilyPond files, transpose music, translate pitch names, convert LilyPond to syntax-colored HTML, etc.

There is also experimental support for converting LilyPond to MusicXML.

Use

ly -h

to get a full list of the features of the ly command.

Here is an example to re-indent and transpose a LilyPond file:

ly “indent; transpose c d” -o output.ly file.ly

### Functionality of the ly Python module:

The ly module supports both Python2 and Python3. This is a short description of some modules:

  • ly.slexer: generic tools to build parsers using regular expressions
  • ly.node: a generic list-like node object to build tree structures with
  • ly.document: a tokenized text document (LilyPond file)
  • ly.lex: a parser for LilyPond, Scheme, and other formats, using slexer
  • ly.music: a tree structure of the contents of a document
  • ly.pitch: functions for translating, transposing etc
  • ly.indent: indent LilyPond text
  • ly.reformat: format LilyPond text
  • ly.dom: (deprecated) tree structure to build LilyPond text from
  • ly.words: words for highlighting and autocompletion
  • ly.data: layout objects, properties, interfaces, font glyphs etc extracted from LilyPond

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