got templating working to the point of swapping out all of the 16th n…

…otes for the same given probability

drum_definition.erb

@@ -0,0 +1,33 @@
+$clock.bpm = 175
+$mutation = L{|measure| 0 == (measure - 1) % 2}
+$measures = 4
+
+probabilities = {}
+
+<% probabilities.each do |k,v| %>
+  probabilities[<%= 36 + k %>] = <%= v.sort.collect{|a| a.last}.inspect %>
+<% end %>
+
+def note(midi_note_number)
+  Note.create(:channel => 2,
+              :number => midi_note_number,
+              :duration => 0.25,
+              :velocity => 100 + rand(27))
+end
+
+static = L{1.0}
+dynamic = L{rand}
+check_every_drum = L{|queue| queue[queue.size - 1]}
+check_random_drums = L{|queue| queue[rand(queue.size)]}
+
+notes = []
+(36..45).each do |midi_note_number|
+  notes << Drum.new(:note => note(midi_note_number),
+                    :when => L{|beat| false},
+                    # :number_generator => static,
+                    :number_generator => dynamic,
+                    # :next => check_every_drum,
+                    :next => check_random_drums,
+                    :probabilities => probabilities[midi_note_number])
+end
+notes

templarx.rb

@@ -1,2 +1,31 @@
-class Templarx
+require 'erb'
+
+class Templarx  
+  TEMPLATE_PATH = File.expand_path(File.dirname(__FILE__)) + "/drum_definition.erb"
+
+  attr_accessor :probabilities
+  attr_accessor :default_probability
+
+  def initialize opts={}
+    @ddpath = opts[:definition_path]
+    @default_probability = opts[:probability] 
+  end
+
+  # 10x16 hash of 0.0-1.0
+  # rows represent midi channels, columns sixteenth notes
+  def initialize_probabilities
+    @probabilities = {}
+    (0..9).each{|i| @probabilities[i] = {}}
+    (0..9).each{|i| k={}; (0..15).each{|j| k[j] = @default_probability || 0.5}; @probabilities[i] = k }
+  end
+
+  def template
+    @template ||= open(TEMPLATE_PATH).read
+  end
+
+  def rewrite_drum_definition
+    initialize_probabilities
+    e = ERB.new template
+    File.open(@ddpath, "w"){|f| f << e.result(binding)}
+  end
 end