buffer.setMode("groovy");
buffers = jEdit.getBuffers();
for(i = 0; i < buffers.length; i++) {
    gsh = buffers[i].getProperty("GroovyShell");
    if(gsh != null) { break; }
}
if(gsh == null) {
    libfiles = new File(System.getenv("GROOVY_HOME") + "/lib/").listFiles();
    cl = this.getClass().getClassLoader();
    for(i = 0; i < libfiles.length; i++)
        cl.addURL(new URL("jar:" + libfiles[i].toURL().toString() + "!/"));
    gsh = new groovy.lang.GroovyShell(cl);
}
for(i = 0; i < buffers.length; i++)
    buffers[i].setProperty("GroovyShell", gsh);
outbuffer = buffer.getProperty("outbuffer");
if((outbuffer == null) || outbuffer.isClosed()) {
    outbuffer = jEdit.newFile(view);
    buffer.setProperty("outbuffer", outbuffer);
}
out = new java.io.StringWriter();
gsh.setProperty("out", out);
String text() {
    view.showBuffer(buffer);
    res = textArea.getSelectedText();
    if(res == null || res.length() == 0) { res = buffer.getText(); }
    return res;
}
String cwd = System.getProperty("user.dir");
System.setProperty("user.dir", buffer.getDirectory());
result = gsh.evaluate(text());
System.setProperty("user.dir", cwd);
outbuffer.remove(0, outbuffer.getLength());
outbuffer.insert(0, out.toString());
outbuffer.insert(outbuffer.getLength(),"\n\tResult: " + result);
if(result != null) {
    view.showBuffer(outbuffer);
}