\language "english"

#(set-global-staff-size 14)
#(set! paper-alist (cons '("my size" . (cons (* 4.5 in) (* 6.25 in))) paper-alist))

#(define (rest-score r)
   (let ((score 0)
         (yoff (ly:grob-property-data r 'Y-offset))
         (sp (ly:grob-property-data r 'staff-position)))
     (if (number? yoff)
       (set! score (+ score 2))
       (if (eq? yoff 'calculation-in-progress)
         (set! score (- score 3))))
     (and (number? sp)
          (<= 0 2 sp)
          (set! score (+ score 2))
          (set! score (- score (abs (- 1 sp)))))
     score))


#(define (merge-rests-on-positioning grob)
   (let* ((can-merge #f)
          (elts (ly:grob-object grob 'elements))
          (num-elts (and (ly:grob-array? elts)
                         (ly:grob-array-length elts)))
          (two-voice? (= num-elts 2)))
     (if two-voice?
       (let* ((v1-grob (ly:grob-array-ref elts 0))
              (v2-grob (ly:grob-array-ref elts 1))
              (v1-rest (ly:grob-object v1-grob 'rest))
              (v2-rest (ly:grob-object v2-grob 'rest)))
         (and
           (ly:grob? v1-rest)
           (ly:grob? v2-rest)
           (let* ((v1-duration-log (ly:grob-property v1-rest 'duration-log))
                  (v2-duration-log (ly:grob-property v2-rest 'duration-log))
                  (v1-dot (ly:grob-object v1-rest 'dot))
                  (v2-dot (ly:grob-object v2-rest 'dot))
                  (v1-dot-count (and (ly:grob? v1-dot)
                                     (ly:grob-property v1-dot 'dot-count -1)))
                  (v2-dot-count (and (ly:grob? v2-dot)
                                     (ly:grob-property v2-dot 'dot-count -1))))
             (set! can-merge
               (and
                 (number? v1-duration-log)
                 (number? v2-duration-log)
                 (= v1-duration-log v2-duration-log)
                 (eq? v1-dot-count v2-dot-count)))
             (if can-merge
               ;; keep the rest that looks best:
               (let* ((keep-v1? (>= (rest-score v1-rest)
                                    (rest-score v2-rest)))
                      (rest-to-keep (if keep-v1? v1-rest v2-rest))
                      (dot-to-kill (if keep-v1? v2-dot v1-dot)))
                 ;; uncomment if you're curious of which rest was chosen:
                 ;;(ly:grob-set-property! v1-rest 'color green)
                 ;;(ly:grob-set-property! v2-rest 'color blue)
                 (ly:grob-suicide! (if keep-v1? v2-rest v1-rest))
                 (if (ly:grob? dot-to-kill)
                   (ly:grob-suicide! dot-to-kill))
                 (ly:grob-set-property! rest-to-keep 'direction 0)
                 (ly:rest::y-offset-callback rest-to-keep)))))))
     (if can-merge
       #t
       (ly:rest-collision::calc-positioning-done grob))))

\paper {
  #(set-paper-size "my size")
}





\parallelMusic #'(soprano alto tenor bass) {
  \partial 4*1      c,4       | \partial 4*1 c4            | \partial 4*1 r4            | \partial 4*1 r4              |
  f4       f        g8(   a)  | f4 f g8( a)                | r2.                        | r2.                          |
  f4       f        a8(   bf) | f4 f f8( g)                | r2.                        | r2.                          |
  c4       c        d         | a4. g8 f4                  | r2.                        | r2.                          |
  bf2 \bar "||"     g8(   a)  | g2 \bar "||" d4            | r4 r4 \bar "||" bf,8( a)   | r4 r4 \bar "||"
  \break         g8(   f)  |



  bf4      bf       c        | g4.         f8    g4        | g4       g        c         | e4       e        e         |
  a4       a        f8(   a) | f4       f4       f4        | c4       c        d8( c)    | f4.         e8    d4        |
  g4       d        f        | d4.         c8    d4        | b4       a        b4        | g4       g        g         |
  e2 \bar "||"
  \break         c4       | c2 \bar "||"      c4        | c2 \bar "||"      r4        | c,2 \bar "||"     r4        |



  f4       f        g8(   a) | f4       f        g8( a)    | r2.                         | r2.                         |
  f4 f a8( bf)               | f4 f f8( g)                 | r2.                         | r2.                         |
  c4 c d                     | a4. g8 f4                   | r2.                         | r2.                         |
  bf2 \bar "||"     g8(   a) | g2 \bar "||"      d4        | r4 r4 \bar "||"   bf8( a)   | r4 r4 \bar "||"\break g'8 f |



  bf4      bf       c        | g4.         f8    g4        | g4       g        c         | e4.         d8    e4        |
  a4       a        f8(   a) | f4       f        f8( e)    | c4       c        c         | f4       f        a,        |
  g4       d        e        | d4       d4       c8(   bf) | bf8([d)] c([  bf)]a([   g)] | bf4      g        c         |
  f2 \bar "||"               | a2 \bar "||"                | f2 \bar "||"                | f,2 \bar "||"               |
}

\score {
  \header{
  }

  \new ChoirStaff  \with {
    \override RestCollision.positioning-done = #merge-rests-on-positioning
  }     <<
    \new Staff = "female" {
      \time 3/4
      \key f \major
      \new Voice = "women" <<
        \relative c'' {
          {\voiceOne \soprano}
        }
        \new Voice = "altos" {\relative c' { \voiceTwo \alto }}
      >>
    }
    \new Lyrics {
      \lyricsto "women" {
        \set stanza = #"1. "
        A -- way in a man -- ger, No crib for a bed,
        The lit -- tle Lord Je -- sus Laid down his sweet head.
        The stars in the bright sky Look'd down where he lay,
        The little Lord Je -- sus A -- sleep on the hay.
      }
    }
    \new Lyrics {
      \lyricsto "women" {
        \set stanza = #"2. "
        The cat -- tle are low -- ing, The ba -- by a -- wakes,
        But lit -- tle Lord Je -- sus No cry -- ing he makes.
        I love thee, Lord Je -- sus! Look down from the sky,
        And stay by my cra -- dle Till morn -- ing  is nigh.
      }
    }
    \new Lyrics {
      \lyricsto "women" {
        \set stanza = #"3. "
        Be near me, Lord Je -- sus; I ask thee to stay
        Close by me for -- ev -- er, And love me, I pray.
        Bless all the dear chil -- dren In thy ten -- der care,
        And fit us for hea -- ven, To live with thee there.
      }
    }
    \new Staff = "male" {
      \time 3/4
      \clef bass
      \key f \major
      \new Voice = "men" <<
        \relative c'' {
          {\voiceOne \tenor}
        }
        \new Voice = "basses" {\relative c' { \voiceTwo \bass }}
      >>
    }
  >>


  \layout {
    indent = 0.0\cm
    \context {
      \Lyrics
      \override LyricText #'font-size = #-2
    }
  }
  \midi { }
}

\version "2.18.2"  % necessary for upgrading to future LilyPond versions.