Simplify README generator

docs/src/main/ruby/generate_readme.sh

@@ -2,11 +2,11 @@
 
 base_dir = File.join(File.dirname(__FILE__),'../../..')
 src_dir = File.join(base_dir, "/src/main/asciidoc")
-require File.join(File.dirname(__FILE__), 'readme.rb')
+require 'asciidoctor'
 require 'optparse'
 
 options = {}
-input = "#{src_dir}/README.adoc"
+file = "#{src_dir}/README.adoc"
 
 OptionParser.new do |o|
   o.on('-o OUTPUT_FILE', 'Output file (default is stdout)') { |file| options[:to_file] = file unless file=='-' }
@@ -14,6 +14,17 @@ OptionParser.new do |o|
   o.parse!
 end
 
-input = ARGV[0] if ARGV.length>0
+file = ARGV[0] if ARGV.length>0
 
-SpringCloud::Build.render_file(input, options)
+srcDir = File.dirname(file)
+out = "// Do not edit this file (e.g. go instead to src/main/asciidoc)\n\n"
+doc = Asciidoctor.load_file file, safe: :safe, parse: false
+out << doc.reader.read
+
+unless options[:to_file]
+  puts out
+else
+  File.open(options[:to_file],'w+') do |file|
+    file.write(out)
+  end
+end