From: David Kastrup <dak@gnu.org>
Date: Tue, 24 Sep 2013 09:30:12 +0000 (+0200)
Subject: Issue 3579: Make "Adding extra fingering with scheme" snippet do something useful
X-Git-Tag: release/2.17.28-1~20
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=36397a030af4845ae75b7958550a9e3f5069465e;p=lilypond.git

Issue 3579: Make "Adding extra fingering with scheme" snippet do something useful

This snippet was never operative in 2.16 due to the EventChord changes
of issue 2240.  This updates it into using a few 2.16 features in
order to make things simpler while retaining the basic purpose.
---

diff --git a/Documentation/snippets/new/adding-extra-fingering-with-scheme.ly b/Documentation/snippets/new/adding-extra-fingering-with-scheme.ly
new file mode 100644
index 0000000000..b4d32ff1ea
--- /dev/null
+++ b/Documentation/snippets/new/adding-extra-fingering-with-scheme.ly
@@ -0,0 +1,39 @@
+\version "2.16.0"
+
+\header {
+  lsrtags = "scheme-language"
+
+  texidoc = "
+You can add additional elements to notes using @code{map-some-music}. In this
+example, an extra script is attached to a note.
+
+In general, first do a @code{\\displayMusic} of the music you want to
+create, then write a function that will work on the appropriate parts
+of the music for you.
+"
+  doctitle = "Adding extra fingering with scheme"
+}
+
+addScript =
+#(define-music-function (parser location script music)
+   (ly:event? ly:music?)
+   (map-some-music
+    (lambda (mus)
+      (define (append-script-at! prop)
+        (set! (ly:music-property mus prop)
+              (append (ly:music-property mus prop)
+                      (list (ly:music-deep-copy script))))
+        mus)
+      (case (ly:music-property mus 'name)
+        ((EventChord)
+         (append-script-at! 'elements))
+        ((NoteEvent)
+         (append-script-at! 'articulations))
+        (else #f)))
+    music))
+
+\score {
+  {
+    \addScript _6 { c'4-3 <c' e' g'> }
+  }
+}