class ElmCompiler

# File lib/elm_compiler.rb, line 7
def initialize(content)
  setup_dir

  @content = content
end

# File lib/elm_compiler.rb, line 13
def process!
  output = '', status = nil

  with_error_handling do
    result = File.open(tmp_path, 'w') { |f| f.write(@content) }

    out, err, status = Open3.capture3("#{ELM_COMMAND} #{tmp_path} --output #{dest_path}")

    if status.success?
      output = File.read(dest_path)
      File.delete(dest_path)
    else
      puts '*** ERROR: Elm'
      puts "** OUT:\n#{out}"
      puts "** ERR:\n#{err}"
    end
  end

  output
end

# File lib/elm_compiler.rb, line 68
def dest_path
  File.join(elm_dir, 'build', "#{tmp_file}.html")
end

# File lib/elm_compiler.rb, line 56
def elm_dir
  '_elm'
end

# File lib/elm_compiler.rb, line 50
def in_elm_dir
  Dir.chdir(elm_dir)
  yield
  Dir.chdir('..')
end

# File lib/elm_compiler.rb, line 36
def setup_dir
  Dir.mkdir(elm_dir) unless File.exist?(elm_dir) && File.directory?(elm_dir)
end

# File lib/elm_compiler.rb, line 60
def tmp_file
  @tmp_file ||= SecureRandom.hex(16)
end

# File lib/elm_compiler.rb, line 64
def tmp_path
  File.join(elm_dir, "#{tmp_file}.elm")
end

# File lib/elm_compiler.rb, line 40
def with_error_handling
  begin
    yield
  rescue Errno::ENOENT => e
    puts "*** ERROR Elm: #{e.inspect}"
  ensure
    File.delete(tmp_path)
  end
end