jEdit macro integrating jRuby

buffer.setMode("ruby");
buffers = jEdit.getBuffers();
for(i = 0; i < buffers.length; i++) {
    jrc = buffers[i].getProperty("JRubyContainer");
    if(jrc != null) { break; }
}
if(jrc == null) {
	jarfilenamefilter = new java.io.FilenameFilter() {
		boolean accept(File dir, String name) {
			return name.endsWith(".jar");
		}
	};
    libfiles = new File(System.getenv("JRUBY_HOME") + "/lib/").listFiles(jarfilenamefilter);
    urls = new URL[libfiles.length];
    for(i = 0; i < libfiles.length; i++) {
        urls[i] = new URL("jar:" + libfiles[i].toURL().toString() + "!/");
    }
    jrubycl = new java.net.URLClassLoader(urls, this.getClass().getClassLoader());
    jrc = jrubycl.loadClass("org.jruby.embed.ScriptingContainer").newInstance();
    //jrc.setCompatVersion(jrubycl.loadClass("org.jruby.CompatVersion").getEnumConstants()[2]); //JRUBY1_9
    //jrc.setKCode(jrubycl.loadClass("org.jruby.util.KCode").getEnumConstants()[2]); //UTF8
    jrc.setClassLoader(jrubycl);
}
for(i = 0; i < buffers.length; i++) {
    buffers[i].setProperty("JRubyContainer", jrc);
}
outbuffer = buffer.getProperty("outbuffer");
if((outbuffer == null) || outbuffer.isClosed()) {
    outbuffer = jEdit.newFile(view);
    buffer.setProperty("outbuffer", outbuffer);
}
out = new java.io.StringWriter();
jrc.setWriter(out);
String text() {
    view.showBuffer(buffer);
    res = textArea.getSelectedText();
    if(res == null || res.length() == 0) { res = buffer.getText(); }
    return res;
}
text = text();
jrc.remove("DATA");
ma = java.util.regex.Pattern.compile("(?sm)\\A(.+)^__END__$(.*)\\z").matcher(text);
if(ma.matches()) {
    text = ma.group(1);
    jrc.put("DATA", ma.group(2));
}
result = jrc.runScriptlet(new java.io.ByteArrayInputStream(("# -*- encoding : utf-8 -*-\n" + text).getBytes("UTF-8")), "script.rb");
outbuffer.remove(0, outbuffer.getLength());
outbuffer.insert(0, out.toString());
outbuffer.insert(outbuffer.getLength(),"\n\tResult: " + result);
if(result != null) {
    view.showBuffer(outbuffer);
}