\version "2.19.53"

\paper { ragged-right = ##f }

\pointAndClickOff

#(set-global-staff-size 16)

\markup { "automatic extenders, minimum-length 8 "} 
<<
    { c''1 2 ~ 2 2 4 ~ 4 4 8 ~ 8 8  16 ~ 16 4 1  \bar "|." }
    \addlyrics { \override Lyrics.LyricExtender.minimum-length = #8
                 \repeat unfold 4 {  foo -- bar }}
>>

\markup { "automatic extenders, minimum-length 4 "} 
<<
    { c''1 2 ~ 2 2 4 ~ 4 4 8 ~ 8 8  16 ~ 16 4 1  \bar "|." }
    \addlyrics { \override Lyrics.LyricExtender.minimum-length = #4
                 \repeat unfold 4 {  foo -- bar }}
>>

\markup { "automatic extenders, minimum-length 1 "} 
<<
    { c''1 2 ~ 2 2 4 ~ 4 4 8 ~ 8 8  16 ~ 16 4 1  \bar "|." }
    \addlyrics { \override Lyrics.LyricExtender.minimum-length = #1
                 \repeat unfold 4 {  foo -- bar }}
>>

feo = {\once \override Lyrics.LyricExtender.force-extender = ##t}

\markup { "automatic extenders, mixed manual and automatic melismata, extender on last note forced "} 
<<
    { \autoBeamOff
      c''2 2 4\( 4 4 4\)
      4 4 4\( 4( 4) 8[ 8] 8\)
      16\(\melisma 16\melismaEnd 4\) 1
      \bar "|." }
    \addlyrics {
        \override Lyrics.LyricExtender.minimum-length = #8
        foo -- _ bar _ _ _ foo -- _ bar _ _ _ 
        foo -- _ \feo bar _ _ _ }
>>

\markup { "automatic extenders, mixed manual and automatic melismata, first extender shortened, extender on last note forced "} 
<<
    { \autoBeamOff
      c''2 2 4\( 4 4 4\)
      4 4 4\( 4( 4) 8[ 8] 8\)
      16\(\melisma 16\melismaEnd 4\) 1
      \bar "|." }
    \addlyrics {
        \override Lyrics.LyricExtender.minimum-length = #8
        foo -- _ \feo bar _ "" _  foo -- _ bar _ _ _ 
        foo -- _ \feo bar _ _ _ }
>>

\markup { "Issue 1006 revisited, last extender forced and tweaked to the left, minimum-length 2 "} 
\score { 
  <<
    \new Staff \relative c'' { 
      \time 2/1
      \repeat volta 2 {
        r4 g4 d'2. a4 bes2~
        bes  a2 g1~
      }
      \alternative{
       { g2 fis4 e fis1 d'1 c2 bes}
       { g\repeatTie fis4 e fis1 }
      }
      \bar "|."
    }
    \addlyrics {
       \override Lyrics.LyricExtender.minimum-length = #2
        of Prin -- ces all _ _ the _ flow’r. Who took a-
       \feo \tweak self-alignment-X #-4 \markup\null the _ flow’r.
    }
  >>
}

\markup { "Issue 1006 revisited, last extender forced and tweaked to the left, minimum-length 1 "} 
\score { 
  <<
    \new Staff \relative c'' { 
      \time 2/1
      \repeat volta 2 {
        r4 g4 d'2. a4 bes2~
        bes  a2 g1~
      }
      \alternative{
       { g2 fis4 e fis1 d'1 c2 bes}
       { g\repeatTie fis4 e fis1 }
      }
      \bar "|."
    }
    \addlyrics {
       \override Lyrics.LyricExtender.minimum-length = #1
        of Prin -- ces all _ _ the _ flow’r. Who took a-
       \feo \tweak self-alignment-X #-4 \markup\null the _ flow’r.
    }
  >>
}

\layout {
    \Lyrics
    \override LyricExtender.no-extender = ##f % Use ##t to disable all but forced extenders
}