GNU LilyPond Notation Reference: 6.5.1 Context evaluation

### 6.5.1 Context evaluation

Contexts can be modified during interpretation with Scheme code. The syntax for this is

>     \applyContext function

function should be a Scheme function taking a single argument, being the context to apply it to. The following code will print the current bar number on the standard output during the compile:

>     \applyContext
>       #(lambda (x)
>         (format #t "\nWe were called in barnumber ~a.\n"
>          (ly:context-property x 'currentBarNumber)))

Other languages: español.

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