score.ly.erb

require 'erb'
require 'json'
require 'optparse'

def get_template()
%q{

      #(set-default-paper-size "letter")
    <% if @transposed %>
      #(set-global-staff-size scStaffSizeTranspose )
    <% else %>
      #(set-global-staff-size scStaffSize )
    <% end %>
    \book {
      <% if @transposed %>
      \bookOutputSuffix "transposed"
      <% end %>
      \paper {
        <% if @transposed %>
          system-system-spacing.minimum-distance = \scMinimumSystemSpacingTranspose
        <% else %>
          system-system-spacing.minimum-distance = \scMinimumSystemSpacing
        <% end %>
        print-page-number = ##f
        print-first-page-number = ##f
        top-margin = 0.5\in
        left-margin = 0.75\in
        right-margin = 0.75\in
        right-bottom = 0.5\in
        last-bottom-spacing = #'((basic-distance . 4) (padding . 4) (stretchability . 1))
        oddFooterMarkup = \markup { 
        \column{
          \fill-line { \line {
            \italic \fromproperty #'header:title
            " - Page"
            \fromproperty #'page:page-number-string
          } } 
      	\fill-line { \tiny { \line{© Monique Rio (CC BY 4.0) | Edition Date: \scDate } } } }
        }
        
        evenFooterMarkup = \oddFooterMarkup
      }

      \header{
        title = \scTitle
        subtitle = \scSubtitle
        meter = \scMeter
        poet = \scPoet
        composer = \scComposer
        arranger = \scArranger
        copyright = \scCopyright
        tagline = \scTagline
      }
      \score {
        \new ChoirStaff <<
         <% for @part in @parts %>
          \new Staff = \scMusic<%= @part %>Name <<
            \set Staff.midiInstrument = #"oboe"
            \new Voice = "<%=@part.downcase%>" {
              <%if @transposed %>
              \transpose \scTransposeFrom \scTransposeTo { 
              <% end %>
              \scGlobal 
              <% if @transposed %>
               \scMusic<%= @part %>ClefTransposed
              <% else %>
               \scMusic<%= @part %>Clef
              <% end %>
                \scMusic<%= @part %>
              <% if  @transposed %> } <% end %>
              
            }
            <% if @verses %>
            <<
              
              <% suffix = 'A' %>
              <% 1.upto(@verses){ |n| %>
                \new Lyrics \lyricsto "<%=@part.downcase%>" { \scWords<%=@part%><%=suffix%> } 
                <% suffix.next! %>
              <% } %>
            >>
            <% end %>
          >>
         <% end %>
        >>
        \layout { 
        }
        \midi {
          \context {
            \Score
            tempoWholesPerMinute = \scTempo
          }
        }
      }
    }
  }
end

class ScoreFile
  include ERB::Util

  def initialize(parts, verses, transposed, template)
    numbers = ['One','Two','Three','Four','Five','Six','Seven','Eight']
    @parts = numbers[0.. parts-1]
    @transposed_flag = transposed
    @verses = verses
    @template = template 
  end

  def render()
    ERB.new(@template).result(binding)
  end

  def save(file)
    File.open(file, "w+") do |f|

      @transposed = false;
      f.write(render)

      if @transposed_flag
        @transposed = true;
        f.write(render)
      end
    end
  end

end

args = {}
File.open(ARGV[0]).each do |line|
  if line.match(/^%score_options/) 
    line.slice!('%score_options ')
    args = JSON.parse(line,{symbolize_names: true})
    break
  end
end

options = {output: "./score.ly"}

OptionParser.new do |parser|
    parser.on("-o", "--output LOCATION", "Require the Output LOCATION before executing your script") do |output|
        options[:output] = output
    end
end.parse!



score = ScoreFile.new(args[:parts], args[:verses], args[:transposed], get_template)
score.save(options[:output])