class Pry::Terminal

# File lib/pry/terminal.rb, line 31
def actual_screen_size
  # The best way, if possible (requires non-jruby ≥1.9 or io-console gem)
  screen_size_according_to_io_console or
    # Fall back to the old standby, though it might be stale:
    screen_size_according_to_env or
    # Fall further back, though this one is also out of date without something
    # calling Readline.set_screen_size
    screen_size_according_to_readline or
    # Windows users can otherwise run ansicon and get a decent answer:
    screen_size_according_to_ansicon_env
end

# File lib/pry/terminal.rb, line 27
def height!
  size![0]
end

# File lib/pry/terminal.rb, line 7
def screen_size
  rows, cols = actual_screen_size
  if rows.to_i != 0 && cols.to_i != 0
    [rows.to_i, cols.to_i]
  else
    nil
  end
end

# File lib/pry/terminal.rb, line 78
def screen_size_according_to_ansicon_env
  return unless ENV['ANSICON'] =~ /\((.*)x(.*)\)/

  size = [$2, $1]
  size if nonzero_column?(size)
end

# File lib/pry/terminal.rb, line 62
def screen_size_according_to_env
  size = [ENV['LINES'] || ENV['ROWS'], ENV['COLUMNS']]
  size if nonzero_column?(size)
end

# File lib/pry/terminal.rb, line 43
def screen_size_according_to_io_console
  return if Pry::Helpers::Platform.jruby?

  begin
    require 'io/console'

    begin
      if $stdout.respond_to?(:tty?) && $stdout.tty? && $stdout.respond_to?(:winsize)
        $stdout.winsize
      end
    rescue Errno::EOPNOTSUPP
      # $stdout is probably a socket, which doesn't support #winsize.
    end
  rescue LoadError
    # They probably don't have the io/console stdlib or the io-console gem.
    # We'll keep trying.
  end
end

# File lib/pry/terminal.rb, line 67
def screen_size_according_to_readline
  if defined?(Readline) && Readline.respond_to?(:get_screen_size)
    size = Readline.get_screen_size
    size if nonzero_column?(size)
  end
rescue Java::JavaLang::NullPointerException
  # This rescue won't happen on jrubies later than:
  #     https://github.com/jruby/jruby/pull/436
  nil
end

# File lib/pry/terminal.rb, line 17
def size! default = [27, 80]
  screen_size || default
end

# File lib/pry/terminal.rb, line 22
def width!
  size![1]
end

# File lib/pry/terminal.rb, line 87
def nonzero_column?(size)
  size[1].to_i > 0
end