Lilypond not automatically starting a new row of bars when lyrics and music too long to fit on single line - lilypond

Question

I have the following script:
\version "2.16.0"
\header {title = "He came down"}
upper = \relative c'' {
\easyHeadsOn
\clef treble
\key g \major
\numericTimeSignature
\time 4/4
%He came down that we may have love;
d,8 <d g>4 <d g> <d b'> <c a'> <d g> <fis a> <d c>2 r8
%He came down that we may have love;
<d c>8 <d a'>4 <d a'> <e c'> <d b'> <c a'> <d b'> <b g'>2 r8
%He came down that we may have love;
<b g'>8 <d b'>4 <d b> <g d'> <g c> <g b> <g c> g2
%Hal -- le -- lu -- Yah for ev -- er -- more.
}
lower = \relative c {
\clef bass
\key g \major
\time 4/4
d8
}
text = \lyricmode {
He came down that we may have love;
He came down that we may have love;
He came down that we may have love;
Hal -- le -- lu -- Yah for ev -- er -- more.
}
\score {
\new GrandStaff <<
\new Staff = upper {\new Voice = "singer" \upper }
\new Lyrics \lyricsto "singer" \text
\new Staff = lower { \lower }
>>
}
Unfortunately when I compile it in Lilypond I get the following output:
Does anyone know how I can get Lilypond to typeset this correctly?

Answer 1

This is not really a programming issue, your problem is that you are adding too many notes to your 4/4 time signature. LilyPond has problems deciding when to add line breaks if the rhythms are exceeding the bar allowance (normally a score not line breaking is a red flag for rhythm problems). You can also add bar checks to your code using |. When using those, LilyPond will check if a bar line coincides with the bar rest position, and if there is a problem an error will be output, telling you exactly where the bar check does not coincide with the bar line.
Here is a fixed version of your code, though I am not sure this is the rhythm you intended or not:
\version "2.16.0"
\header {title = "He came down"}
upper = \relative c'' {
\easyHeadsOn
\clef treble
\key g \major
\numericTimeSignature
\time 4/4
%He came down that we may have love;
d,8 <d g>4 <d g> <d b'> <c a'>8 | <d g>4 <fis a> <d c>2 |
%He came down that we may have love;
<d c>8 <d a'>4 <d a'> <e c'> <d b'>8 | <c a'>4 <d b'> <b g'>2 |
%He came down that we may have love;
<b g'>8 <d b'>4 <d b> <g d'>8 <g c>4 | <g b> <g c> g2 |
%Hal -- le -- lu -- Yah for ev -- er -- more.
}
lower = \relative c {
\clef bass
\key g \major
\time 4/4
d8
}
text = \lyricmode {
He came down that we may have love;
He came down that we may have love;
He came down that we may have love;
Hal -- le -- lu -- Yah for ev -- er -- more.
}
\score {
\new GrandStaff <<
\new Staff = upper {\new Voice = "singer" \upper }
\new Lyrics \lyricsto "singer" \text
\new Staff = lower { \lower }
>>
}

Answer 2

I assume it is just the upbeat that prevents lilypond from detecting the correct rythm. Just add a \partial 8 (this is the length of the upbeat).
\version "2.16.0"
\header {title = "He came down"}
upper = \relative c'' {
\easyHeadsOn
\clef treble
\key g \major
\numericTimeSignature
\time 4/4
\partial 8 % **This marks the upbeat. The length is 8, matching d,8 below**
%He came down that we may have love;
d,8 <d g>4 <d g> <d b'> <c a'>8 | <d g>4 <fis a> <d c>2 |
...