jirb_swing

#!/usr/bin/env jruby
#
# IRB in swing
#
# Damian Steer (pldms@mac.com)

require 'jruby'
require 'irb'
require 'irb/completion'

java_import java.awt.Color
java_import java.awt.Font
java_import javax.swing.JFrame

# default options, esp. useful for jrubyw
ARGV << '--readline' << '--prompt' << 'inf-ruby' if ARGV.empty?

DEFAULT_FONT = ['Monospaced', Font::PLAIN, 14, 'Monaco', 'Andale Mono']
HEADER = " Welcome to the JRuby IRB Console [#{JRUBY_VERSION} (#{RUBY_VERSION})]\n\n"
FRAME_TITLE = 'JRuby IRB Console (tab will autocomplete)'

# Try to find preferred font family, use otherwise -- err --  otherwise
def find_font(otherwise, style, size, *families)
  avail_families = java.awt.GraphicsEnvironment.local_graphics_environment.available_font_family_names
  fontname = families.find(proc {otherwise}) { |name| avail_families.include? name }
  Font.new(fontname, style, size)
end

frame = JFrame.new(FRAME_TITLE).tap do |frame|
  frame.default_close_operation = JFrame::EXIT_ON_CLOSE
  frame.set_size(700, 600)
  frame.content_pane.add(javax.swing.JScrollPane.new.tap do |pane|
    pane.viewport_view = javax.swing.JTextPane.new.tap do |text|
      text.font = find_font *DEFAULT_FONT
      text.margin = java.awt.Insets.new(8,8,8,8)
      text.caret_color = Color.new(0xa4, 0x00, 0x00)
      text.background = Color.new(0xf2, 0xf2, 0xf2)
      text.foreground = Color.new(0xa4, 0x00, 0x00)

      tar = org.jruby.demo.readline.TextAreaReadline.new(text, HEADER)
      tar.hook_into_runtime_with_streams(JRuby.runtime)

      # Ruby does not like redefining constants but we do not want the warnings
      # readline reads constants and not the globals so we need to reassign
      # the globals.
      saved_verbose = $VERBOSE
      $VERBOSE = nil
      STDIN = $stdin
      STDOUT = $stdout
      STDERR = $stderr
      $VERBOSE = saved_verbose
    end
  end)
  
  # We need to show the frame on EDT to avoid deadlocks.
  java.awt.EventQueue.invoke_later {  frame.visible = true }
end

JRuby.objectspace = true # useful for code completion

# From vanilla IRB
if __FILE__.sub(/file:/, '') == $0.sub(/file:/, '')
  IRB.start(__FILE__)
else
  # check -e option
  if /^-e$/ =~ $0
    IRB.start(__FILE__)
  else
    IRB.setup(__FILE__)
  end
end

frame.dispose