start on user guide html generator

rb/assets/user_guide.html.erb

@@ -0,0 +1,13 @@
+<html>
+  <head>
+    <title>RScons User Guide - Version <%= version %></title>
+    <style>
+      body {
+        max-width: 140ex;
+      }
+    </style>
+  </head>
+  <body>
+    <%= body %>
+  </body>
+</html>

rb/gen_user_guide.rb

@@ -0,0 +1,33 @@
+#!/usr/bin/env ruby
+
+require "erb"
+require "fileutils"
+require "redcarpet"
+require "syntax"
+require "rscons/version"
+
+renderer = Redcarpet::Render::HTML.new
+markdown = Redcarpet::Markdown.new(renderer)
+
+def load_file(file_name)
+  contents = File.read(file_name)
+  contents.gsub(/\$\{include (.*?)\}/) do |match|
+    include_file_name = $1
+    File.read(include_file_name)
+  end
+end
+
+input = load_file("doc/user_guide.md")
+
+version = Rscons::VERSION
+body = markdown.render(input)
+template = File.read("rb/assets/user_guide.html.erb")
+
+erb = ERB.new(template, nil, "<>")
+html_result = erb.result
+
+FileUtils.rm_rf("gen/user_guide")
+FileUtils.mkdir_p("gen/user_guide")
+File.open("gen/user_guide/user_guide.html", "w") do |fh|
+  fh.write(html_result)
+end