Module: HighLine::SystemExtensions

Extended by:
SystemExtensions
Included in:
HighLine, SystemExtensions
Defined in:
lib/highline/system_extensions.rb

Constant Summary collapse

JRUBY =
defined?(RUBY_ENGINE) && RUBY_ENGINE == 'jruby'
CHARACTER_MODE =

For Debugging purposes only.

"Win32API"

Instance Method Summary collapse

Instance Method Details

#get_character(input = STDIN) ⇒ Object

Windows savvy getc().

WARNING: This method ignores input and reads one character from STDIN!


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# File 'lib/highline/system_extensions.rb', line 99

def get_character( input = STDIN )
  WinAPI._getch
end

#initialize_system_extensionsObject


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# File 'lib/highline/system_extensions.rb', line 15

def initialize_system_extensions
  require 'java'
  if JRUBY_VERSION =~ /^1.7/
    java_import 'jline.console.ConsoleReader'

    @java_console = ConsoleReader.new(@input.to_inputstream, @output.to_outputstream)
    @java_console.set_history_enabled(false)
    @java_console.set_bell_enabled(true)
    @java_console.set_pagination_enabled(false)
    @java_terminal = @java_console.getTerminal
  elsif JRUBY_VERSION =~ /^1.6/
    java_import 'java.io.OutputStreamWriter'
    java_import 'java.nio.channels.Channels'
    java_import 'jline.ConsoleReader'
    java_import 'jline.Terminal'

    @java_input = Channels.newInputStream(@input.to_channel)
    @java_output = OutputStreamWriter.new(Channels.newOutputStream(@output.to_channel))
    @java_terminal = Terminal.getTerminal
    @java_console = ConsoleReader.new(@java_input, @java_output)
    @java_console.setUseHistory(false)
    @java_console.setBellEnabled(true)
    @java_console.setUsePagination(false)
  end
end

#raw_no_echo_modeObject

We do not define a raw_no_echo_mode for Windows as _getch turns off echo


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# File 'lib/highline/system_extensions.rb', line 104

def raw_no_echo_mode
end

#restore_modeObject


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# File 'lib/highline/system_extensions.rb', line 107

def restore_mode
end

#terminal_sizeObject

A Unix savvy method using stty to fetch the console columns, and rows. … stty does not work in JRuby


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# File 'lib/highline/system_extensions.rb', line 111

def terminal_size
  format        = 'SSSSSssssSS'
  buf           = ([0] * format.size).pack(format)
  stdout_handle = WinAPI.GetStdHandle(0xFFFFFFF5)

  WinAPI.GetConsoleScreenBufferInfo(stdout_handle, buf)
  _, _, _, _, _,
  left, top, right, bottom, _, _ = buf.unpack(format)
  return right - left + 1, bottom - top + 1
end