How can I end a slur in multiple alternative endings in Lilypond?

Question

I'm trying to get lilypond to create a slur that ends in multiple alternative endings to a repeat.

Here's what I have at the moment:

\relative c' {
  \repeat volta 2 {
    c d e f(
    \alternative {
      \volta 1 { g) a b c }
      \volta 2 { g) f e d }
    }
  }
}

This produces:

I'd like to have the slur end in the second alternate ending as well, as shown by the hand-drawn red line. Is this possible?

With the above code I get a compiler warning "cannot end slur" on the g) in the second alternate

Answer 1

In single note cases you might use \repeatTie: https://lilypond.org/doc/v2.24/Documentation/notation/writing-rhythms.html#ties

In more complex cases (multiple notes slurred under the volta) you can create a tie and move the left control point:

\relative c' {
  \repeat volta 2 {
    c d e f(
    \alternative {
      \volta 1 { g) a b c }
      \volta 2 { g\repeatTie f e d }
    }
  }
}

\relative c' {
  \repeat volta 2 {
    c d e f_(
    \alternative {
      \volta 1 { g a b) c }
      \volta 2 { \shape #'((-1.5 . -1) (0 . -0.6) (0 . 0) (0 . 0)) Slur g( f e) d }
    }
  }
}