Demonstrates how to generate refined version for Facets gem

README

Simple script that should work if you follow the convention of declaring a single outer class per file with simple class names and structure.

Some files may not be compatible with refinements and should have some comment like "#skip-refinement-conversion" in the file header (first 10_000 chars of the file). The "class" line should also be in the header section of the file.

Files skipped will be copied "as is" to the new directory.

generate-refined-alternatives.rb

require 'fileutils'

class Converter
  DEST = 'lib-refined'

  def self.convert
    new.convert
  end

  def convert
    FileUtils.mkdir_p DEST
    Dir['lib/**/*.rb'].each do |fn|
      newfn = fn.sub 'lib', DEST
      dir = File.dirname(newfn)
      basename = File.basename fn
      FileUtils.mkdir_p dir
      File.write newfn, processed_file(fn)
    end
  end

  def processed_file(fn)
    content = file_content fn
    header = content[0..10_000] # adjust for your needs or use full content
    return content if header =~ /\#skip-refinement-conversion/
    return content unless match = header.match(/.*?^(\s*class\s.*?$)/m)
    first_class_line = match[1]
    match = first_class_line.match /\s*class\s*([A-Z]\w*)\s*$/
    return content unless match # skip complex cases
    refinement_replacement = "module Facets\nrefine #{match[1]} do"
    # assume a single "class XXX\n...\nend" block per file
    content.sub(first_class_line, refinement_replacement) + "\nend"
  end

  def file_content(fn)
    File.read fn
  end
end

Converter.convert

test.rb

# ruby -I lib-refined/core test.rb

require 'facets/array/before'
using Facets
puts [1, 2].before 2 # 1 is printed

You gave me an idea.

require 'finder'

def refinement(feature)
  file = Find.feature(feature, :absolute=>true).first

  raise LoadError unless file

  text = File.read(file)

  text = text.gsub(/^\s*class\s*([A-Z]\w*)\s*$/, 'module Refinements; refine \1 do')

  text = text + "\nend"

  eval text, TOPLEVEL_BINDING

  return Refinements
end

Usage:

using refinement('facets/string/indent')