Displaying the version number with conditionals (if then) using Scheme

Thanks to its implementation of GUILE, LilyPond makes high level functionalities relatively easy to accomplish.

In this example, the title will mention the current version (i.e. the version the snippet was compiled with, regardless which version was originally used).

\version "2.24"

%% http://lsr.di.unimi.it/LSR/Item?id=264

\paper { tagline = ##f }

#(define pieceTagLine
  (if (not (defined? 'pieceTagLine))
      (string-append "You are running version " (lilypond-version))
      pieceTagLine))

\header{
  title = \pieceTagLine
}

{ c'4 }