lydiff is a tool to compare LilyPond scores similar to comparing text using diff.
LilyPond is a music engraving program.
lydiff requires a python3 installation including the packages argparse, glob, os, subprocess and yaml. Additionally, the programs diff, lilypond (and convert-ly) and ImageMagick needs to be installed. meld is optional.
The examples an the documentation expect that you create a symlink called lydiff to the python file lydiff.py from this repository in a directory in the path of your operating system.
To compare files (first line) or LilyPond versions (line 2 and 3) please use the following commands:
lydiff file1.ly file2.ly
lydiff file.ly -v fromfile latest
lydiff file.ly -v 2.18.2 2.19.54
The result is contained in the output file which is usually named "diff_<files>_<versions>.png".
For further information, please read the documentation and refer to the help command lydiff -h.
This tool is originally written by Joram Berger.
This tool is licensed under the GPL3 or any later version. See license.md for details.