define.dot.erb

digraph settings {
  graph [rankdir=RL]

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

  subgraph values {
    graph [rank=same]

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

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