Class: Ru::Process

Inherits:
Object
  • Object
show all
Defined in:
lib/ru/process.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Process

Returns a new instance of Process.



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# File 'lib/ru/process.rb', line 6

def initialize
  @options        = {}
  @options_parser = OptionParser.new do |opts|
    opts.banner = <<-EOF
      Usage: ru [OPTION]... CODE FILE...
             cat FILE | ru [OPTION]... CODE
             echo CODE | ru [OPTION]...
             echo CODE | ru [OPTION]... '' [FILE...]
    EOF

    opts.on("-h", "Print usage help") do
      @options[:h] = true
    end

    opts.on("--help", "Print examples") do
      @options[:help] = true
    end

    opts.on("-v", "--version", "Print version") do
      @options[:version] = true
    end

    opts.on('-s', '--stream', 'Stream mode') do
      @options[:stream] = true
    end

    opts.on('-b', '--binary', 'Binary mode') do
      @options[:binary] = true
    end

    opts.on('--debug', 'Print debug messages') do
      @options[:debug] = true
      require 'logger'
      $debug = Logger.new($stderr)
      $debug.formatter = proc do |severity, _datetime, _progname, msg|
         "#{severity}: #{msg}\n"
      end
    end
  end
  @option_printer = OptionPrinter.new(options_parser: @options_parser)
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/ru/process.rb', line 48

def run
  output = process_options
  return output if output

  args   = ARGV.dup
  code   = args.shift.to_s
  parsed = prepare_code(code) { get_stdin(args, @options[:stream]) }
  $debug.debug parsed.inspect if $debug
  stdin  = parsed[:stdin]

  if parsed[:code].empty?
    $debug.error "CODE is empty" if $debug
    $stderr.puts @option_printer.run(:h)
    exit false
  end

  context =
    if stdin.kind_of?(String) && stdin.empty?
      $debug.info "STDIN is empty" if $debug
      Ru::Array.new([])
    else
      if @options[:stream]
        if @options[:binary]
          $debug.info "binary stream mode" if $debug
          Ru::Stream.new(stdin.each_byte.lazy)
        else
          $debug.info "text stream mode" if $debug
          Ru::Stream.new(stdin.each_line.lazy.map { |line| line.chomp("\n".freeze) })
        end
      else
        if @options[:binary]
          $debug.info "binary mode" if $debug
          Ru::Array.new(stdin.bytes)
        else
          $debug.info "text mode" if $debug
          # Prevent 'invalid byte sequence in UTF-8'
          stdin.encode!('UTF-8', 'UTF-8', invalid: :replace)
          Ru::Array.new(stdin.split("\n"))
        end
      end
    end

  begin
    output = context.instance_eval(parsed[:code])
  rescue NoMethodError
    $debug.info "loading active_support/all" if $debug
    require 'active_support/all'

    output = context.instance_eval(parsed[:code])
  end

  prepare_output(output)
end