Script to convert bare ruby-processing sketches from processing-2.0 to processing-3.0

convert.rb

# convert.rb

def titleize(str)
  str.gsub(/::/, '/')
    .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2')
    .gsub(/([a-z\d])([A-Z])/, '\1_\2')
    .tr('-', '_')
    .downcase
    .gsub(/_id$/, '')
    .gsub(/_/, ' ').capitalize
    .gsub(/\b([a-z])/) { Regexp.last_match[1].capitalize }
end

SIZER = /^\s*(size)\s*\(?\d+\,\s*\d+\s*.*\)?/
VECLIBR = /\:(vecmath|fastmath)/
SMOOTHR = /^\s*(smooth)/

settings = <<CODE

def settings
  %s
end
CODE
Dir['/home/tux/test/**/*.rb'].each do |rb_file|
  next if File.directory? rb_file
  sz = nil
  old = IO.readlines(rb_file)
  @title = titleize(File.basename(rb_file, '.rb'))
  modified = []
  old.each do |line|
    sz_match = line.match(SIZER)
    vec_match = line.match(VECLIBR)
    sm_match = line.match(SMOOTHR)
    modified << line if [sz_match, vec_match, sm_match].all?(&:nil?)
    modified << format("  sketch_title \'%s\'\n", @title) unless sz_match.nil?
    if vec_match
      lib = line.gsub(/\,?\s?\:(fastmath|vecmath)\,*/, '') 
      modified << lib unless lib.length < 14
    end
    sz = line unless sz_match.nil?
    sz << line unless sm_match.nil?
  end
  next if sz.nil?
  modified << format(settings, sz.strip)
  modified << "\n"
  IO.write(rb_file, modified.join(''))
end

Only works one folder at a time, @todo make it work for nested folders?

Updated to work on folders.

Neater solution to :vecmath and :fastmath libraries