Batch convert JRubyArt sketches to propane

convert.rb

# frozen_string_literal: true
# the scanner class
class Scanner
  attr_reader :sketches, :rest, :sketch

  def initialize(path)
    @sketches = FindSketches.new(path).sketches
  end

  def read_file(file_name)
    requ = %w(#!/usr/bin/env\ jruby require\ 'propane')
    @rest = []
    File.open(file_name) do |file|
      file.each_line do |line|
        line.strip!
        if line =~ /^require/
          requ << line
        else
          rest << line
        end
      end
    end
    requ
  end

  def build_sketch
    class_format = 'class %s < Propane::App'
    new_format = '%s.new'
    sketches.each do |dfil|
      class_name = ClassFromFilename.name(dfil)
      @sketch = read_file(dfil)
      sketch << ''
      sketch << format(class_format, class_name)
      @sketch += rest
      sketch << "end\n"
      sketch << format(new_format, class_name)
      File.open(dfil, 'w') { |file| file.write(sketch.join("\n")) }
    end
  end
end

# build class name from filename
class ClassFromFilename
  def self.name(filename)
    base = File.basename(filename, '.rb')
    humanize = base.split('_').map(&:capitalize)
    humanize.join('')
  end
end

# find sketch files
class FindSketches
  attr_reader :sketches
  def initialize(path)
    @sketches = []
    where = File.join(path, '/**/*.rb')
    Dir[where].each do |file_name|
      unless File.readlines(file_name).grep(/sketch_title/).empty?
        sketches << file_name
      end
    end
  end
end

puts Scanner.new('/home/tux/k9_samples').build_sketch