\version "2.17.30"

\header {
  lsrtags = "fretted-strings"

  texidoc = "
Slides may go from an imprecise point of the fretboard to a specific
fret (slide into) or viceversa (slide out). A good way to do that is
to add a grace hidden note before or after the note which is actually
played, as demonstrated in the following example.
"
  doctitle = "Guitar slides from or to an arbitrary point"
}

%% Hide fret number: useful to draw slide into/from a casual point of
%% the fretboard.
onceHideNote = {
  \once \hide TabNoteHead
  \once \hide NoteHead
  \once \hide Stem
  \once \override NoteHead.no-ledgers = ##t
  \once \override Glissando.bound-details.left.padding = #0.3
}

music= \relative c' {
  \grace { \onceHideNote a8\3^\markup \tiny { Slide into } \glissando } b4\3 s
  \grace { \onceHideNote d8 \glissando } f4\2 s |
  
  f4\3^\markup \tiny { Slide from } \glissando \onceHideNote \grace { c8\3 } s4
  e,4\5 \glissando \grace { \onceHideNote c8 } s4 |
}

\score {
  <<
    \new Staff {
      \clef "G_8"
      \music
    }
    \new TabStaff {
      \music
    }
  >>
  \layout {
    \context {
      \Score
      \override Glissando.minimum-length = #4
      \override Glissando.springs-and-rods = #ly:spanner::set-spacing-rods
      \override Glissando.thickness = #2
    }
    \context {
      \Staff
      \omit StringNumber
    }
  }
}