%% Generated by lilypond-book.py
%% Options: [indent=0\mm,verbatim,doctitle,alt=[image of music],texidoc,line-width=160\mm]
\include "lilypond-book-preamble.ly"


% ****************************************************************
% Start cut-&-pastable-section 
% ****************************************************************



\paper {
  #(define dump-extents #t)
  
  indent = 0\mm
  line-width = 160\mm
  force-assignment = #""
  line-width = #(- line-width (* mm  3.000000))
}

\layout {
  
}



% ****************************************************************
% ly snippet:
% ****************************************************************
\sourcefilename "engravers-one-by-one.ly"
\sourcefileline 0
%% Do not edit this file; it is auto-generated from LSR http://lsr.dsi.unimi.it
%% This file is in the public domain.
\version "2.11.57"

\header {
  lsrtags = "contexts-and-engravers"

  texidoces = "
Del problema central de la notación, esto es, crear un determinado
símbolo, se encargan los «plugins» o complementos añadidos.  Cada
uno de los complementos se conoce como un grabador. En este
ejemplo, los grabadores se van activando uno por uno, en el orden
siguiente:

- cabeza de las notas,

- el símbolo del pentagrama,

- clave,

- plicas,

- barras, ligaduras de expresión, acentos,

- alteraciones, líneas divisorias, indicación del compás, y armadura.

Los grabadores se encuentran agrupados. Por ejemplo, las cabezas
de nota, ligaduras de expresión, barras de corchea, etc. forman un
contexto de voz. Los grabadores de la armadura, alteraciones,
compás, etc. forman un contexto de pentagrama.

Sólo podemos ver el primer ejemplo en este documento; para ver los
demás debemos descartar el fragmento de código y procesarlo en
nuestro ordenador.

"
  doctitlees = "Los grabadores, uno por uno"

  texidoc = "
The notation problem, creating a certain symbol, is handled by plugins.
Each plugin is called an Engraver. In this example, engravers are
switched on one by one, in the following order:

- note heads


- staff symbol,


- clef,


- stem,


- beams, slurs, accents,


- accidentals, bar lines, time signature, and key signature.



Engravers are grouped. For example, note heads, slurs, beams etc. form
a Voice context. Engravers for key, accidental, bar, etc. form a Staff
context.


You may only see the first example in this document; please download
this snippet and run it from your own computer. 

"
  doctitle = "Engravers one-by-one"
} % begin verbatim
%% sample music
topVoice =  \relative c' {
  \key d\major
  es8([ g] a[ fis])
  b4
  b16[-. b-. b-. cis-.]
  d4->
}

botVoice =  \relative c' {
  \key d\major
  c8[( f] b[ a)]
  es4
  es16[-. es-. es-. fis-.]
  b4->
}

hoom =  \relative c {
  \key d \major
  \clef bass
  g8-. r
  r4 
  fis8-.
  r8
  r4
  b'4->
}

pah =  \relative c' {
  r8 b-.
  r4
  r8 g8-.
  r16 g-. r8
  \clef treble
  fis'4->
}

%
% setup for Request->Element conversion. Guru-only
%

MyStaff =\context {
  \type "Engraver_group"
  \name Staff

  \description "Handles clefs, bar lines, keys, accidentals.  It can contain
@code{Voice} contexts."

  
  \consists "Output_property_engraver"	
  
  \consists "Font_size_engraver"

  \consists "Volta_engraver"
  \consists "Separating_line_group_engraver"	
  \consists "Dot_column_engraver"

  \consists "Ottava_spanner_engraver"
  \consists "Rest_collision_engraver"
  \consists "Piano_pedal_engraver"
  \consists "Piano_pedal_align_engraver"
  \consists "Instrument_name_engraver"
  \consists "Grob_pq_engraver"
  \consists "Forbid_line_break_engraver"
  \consists "Axis_group_engraver"

  \consists "Pitch_squash_engraver"

  \override VerticalAxisGroup #'minimum-Y-extent = #'(-6 . 6)
  extraVerticalExtent = ##f
  verticalExtent = ##f 
  localKeySignature = #'()

				% explicitly set instrument, so we don't get 
				% weird effects when doing instrument names for
				% piano staves

  instrumentName = #'()
  shortInstrumentName = #'()
  
  \accepts "Voice"
}


MyVoice = \context {
  \type "Engraver_group"
  \name Voice

  \description "
    Corresponds to a voice on a staff.  This context handles the
    conversion of dynamic signs, stems, beams, super- and subscripts,
    slurs, ties, and rests.

    You have to instantiate this explicitly if you want to have
    multiple voices on the same staff."

  localKeySignature = #'()
  \consists "Font_size_engraver"
  
				% must come before all
  \consists "Output_property_engraver"	
  \consists "Arpeggio_engraver"
  \consists "Multi_measure_rest_engraver"
  \consists "Text_spanner_engraver"
  \consists "Grob_pq_engraver"
  \consists "Note_head_line_engraver"
  \consists "Glissando_engraver"
  \consists "Ligature_bracket_engraver"
  \consists "Breathing_sign_engraver"
				% \consists "Rest_engraver"
  \consists "Grace_beam_engraver"
  \consists "New_fingering_engraver"
  \consists "Chord_tremolo_engraver"
  \consists "Percent_repeat_engraver"
  \consists "Slash_repeat_engraver"

%{
  Must come before text_engraver, but after note_column engraver.

%}
  \consists "Text_engraver"
  \consists "Dynamic_engraver"
  \consists "Fingering_engraver"

  \consists "Script_column_engraver"
  \consists "Rhythmic_column_engraver"
  \consists "Cluster_spanner_engraver"
  \consists "Tie_engraver"
  \consists "Tie_engraver"
  \consists "Tuplet_engraver"
  \consists "Note_heads_engraver"
  \consists "Rest_engraver"

  \consists "Skip_event_swallow_translator"
}


\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}


MyStaff = \context {
    \MyStaff
    \consists "Staff_symbol_engraver"
}

\score {
  \topVoice
  \layout {
      \context { \MyStaff }
      \context { \MyVoice }
            }
}

MyStaff = \context {
    \MyStaff
    \consists "Clef_engraver"
    \remove "Pitch_squash_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyVoice = \context {
  \MyVoice
  \consists "Stem_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyVoice = \context {
  \MyVoice
  \consists "Beam_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyVoice= \context {
  \MyVoice
  \consists "Phrasing_slur_engraver"
  \consists "Slur_engraver"
  \consists "Script_engraver"
}


\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyStaff = \context {
  \MyStaff
  \consists "Bar_engraver"
  \consists "Time_signature_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyStaff = \context {
  \MyStaff
  \consists "Accidental_engraver"    
  \consists "Key_engraver"
}
\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}




% ****************************************************************
% end ly snippet
% ****************************************************************