Re: vertical spacing of footnotes

[Jean Abou Samra]

Le mardi 14 février 2023 à 07:28 +0000, Werner LEMBERG a écrit :

• In what context are footnote texts handled?  I want to globally   adjust baseline-skip for my (redefined) \strut function, but I'm   not able to do it.

Like all sticky grobs, footnotes are created in the same context as the grob they annotate. Overriding on Score level should work to set properties for all footnotes (unless there are overrides in lower-level contexts, which take precedence). The problem here is that footnote texts are not interpreted by the Footnote grobs themselves, which is kind of logical because they're printed at a completely different location. See page-layout-problem.cc line 251:

              SCM footnote_markup = get_property (footnote, "footnote-text");
              if (Spanner *orig = dynamic_cast<Spanner *> (footnote))
                if (orig->is_broken ())
                  footnote_markup
                    = get_property (orig->broken_intos_[0], "footnote-text");

              SCM props
                = Lily::layout_extract_page_properties (paper->self_scm ());

              auto footnote_stencil = Text_interface::interpret_markup (
                paper, props, footnote_markup);

To change those properties, you could do

\paper {
  text-font-defaults.baseline-skip = 3
}

• If there were a context, I could apply Valentin's 'replace' trick:

    \override TextScript.before-line-breaking =     #(lambda (grob)        (ly:grob-set-property!          grob 'text          (markup #:replace                  `(("@" . ,#{ \markup{ \strut } #}))                  (ly:grob-property grob 'text))))  

  [I'm aware that in this case before-line-breaking is probably not    correct, but...]

  which would simplify the above footnote entries to

    \footnote #'(-0.5 . -1) "@Meter change." Staff.TimeSignature  

You can use Score, see above. Additionally, for footnotes, the text property holds the number that is printed in the music. You want footnote-text.

    \override Score.Footnote.footnote-text =
      #(grob-transformer
        'footnote-text
        (lambda (grob orig)
          #{ \markup \replace #`(("@" . ,#{ \markup \strut #})) #orig #}))

or even

    \override Score.Footnote.footnote-text =
      #(grob-transformer
        'footnote-text
        (lambda (grob orig)
          #{ \markup { \strut #orig } #}))

to add the strut to all texts.

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