3

I want to format text in the headings of both 1st and 2nd ending Volta brackets in Lilypond. There are several examples of formatted text in the first ending bracket, but I cannot seem to find one with formatted text (using a markup command) in the second ending bracket.

In other words, I have this snippet:

01     voltaAdLib = \markup { 1. 2. 3... \text \italic { ad lib. } }
02
03     \relative c'' {
04       c1
05       \set Score.repeatCommands = #(list (list 'volta voltaAdLib) 'start-repeat)
06       c4 b d e
07       \set Score.repeatCommands = #'((volta #f) (volta "4.") end-repeat)
08       f1
09       \set Score.repeatCommands = #'((volta #f))
10     }

And I want to add another myText = \markup... block in place of "4." in line 07. How would I do that?

2

That's more a question of Scheme syntax than of LilyPond. First you have to note that ' in Scheme is used for quoting material rather than having it interpreted. What's worth quoting are lists (the things included in (...)) and symbols (basic strings used like identifiers). A list, when quoted, has all of its elements quoted and then is a list. If it is unquoted, it is evaluated. An evaluated list is a function call, with the first element being the function and the remaining elements being the values, all of which are evaluated before the call.

A typical function is list which takes its arguments and puts them into a list.

Another item that is different when evaluated is a symbol (mentioned above). Unevaluated, it is a unique thing that does not compare equal to any other unique thing. Evaluated, it is more or less a variable access.

So in the above,

    #(list (list 'volta voltaAdLib) 'start-repeat)

is basically the same as

    #'((volta i-would-like-the-value-of-voltaAdLib) start-repeat)

for which one can use quasiquotes which quote anything that is not preceded by ,. So one could write this as

    #`((volta ,voltaAdLib) start-repeat)

Note that I am now using the backward-pointing quasi-quote after #. If I used the regular quote, the result would be equivalent to

    #'((volta (unquote voltaAdLib)) start-repeat)

which does not help. Quasiquotes are usually quite more convenient for list-building with only a few values from variables or function calls than building the list with explicit calls of list. So getting back to your use-case, you'd likely want

    \set Score.repeatCommands = #`((volta #f) (volta ,#{ \markup "ad lib." #}) end-repeat)

Using #{ \markup ... #} directly in Scheme is supported since version 2.16 I think, but of course you can also use a variable like in your first example.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.