define.dot.erb

digraph settings {
  graph [rankdir=RL]

  subgraph defaults {
<%
  require 'set'
  numbers = Set.new
  tapping_resolution_formulas = Set.new
  settings = {}
  `grep -h -A1 '^#ifndef' keymap.dtsi.min device.dtsi.min | grep '^#define'`.lines.each do |define|
    (_define, key, value) = define.chomp.split(/\s+/, 3)
    case value
    when /TAPPING_RESOLUTION ([+\-]) (\d+)/
      warn({ formula: {key => $~} })
      value = "#{$1}#{$2}".inspect
      tapping_resolution_formulas << value
    when /^["']/
      warn({ string: {key => value} })
      value = value.rstrip.inspect
    when /^\d+$/
      warn({ number: {key => value} })
      numbers << value
      value = "NUMBER_#{value}"
    when "\\", /\(/
      warn({ definition: {key => value} })
      next # skip this setting -- it's a complex multi-line definition
    end
    settings[key] = value
%>
    <%= key %> -> <%= value %>
<%
  end
%>
<% tapping_resolution_formulas.each do |label| %>
  <%= label %> -> TAPPING_RESOLUTION [color=red]
<% end %>
  }

  subgraph values {
    graph [rank=same]

    <% settings.values.grep(/^".*"$/).uniq.each do |string| %>
      <%= string %> [label=<%= string %>, style=filled, fillcolor=cyan, shape=signature]
    <% end %>

    <% numbers.each do |number| %>
      NUMBER_<%= number %> [label="<%= number %>", style=filled, fillcolor=yellow, shape=signature]
    <% end %>

    <% tapping_resolution_formulas.each do |label| %>
      <%= label %> [label=<%= label %>, style=filled, fillcolor=salmon, shape=lpromoter]
    <% end %>
  }
}